+++ /dev/null
-/*
- * bootsect.S Copyright (C) 1991, 1992 Linus Torvalds
- *
- * modified by Drew Eckhardt
- * modified by Bruce Evans (bde)
- * modified by Chris Noe (May 1999) (as86 -> gas)
- * gutted by H. Peter Anvin (Jan 2003)
- *
- * BIG FAT NOTE: We're in real mode using 64k segments. Therefore segment
- * addresses must be multiplied by 16 to obtain their respective linear
- * addresses. To avoid confusion, linear addresses are written using leading
- * hex while segment addresses are written as segment:offset.
- *
- */
-
-#include <asm/boot.h>
-
-SETUPSECTS = 4 /* default nr of setup-sectors */
-BOOTSEG = 0x07C0 /* original address of boot-sector */
-INITSEG = DEF_INITSEG /* we move boot here - out of the way */
-SETUPSEG = DEF_SETUPSEG /* setup starts here */
-SYSSEG = DEF_SYSSEG /* system loaded at 0x10000 (65536) */
-SYSSIZE = DEF_SYSSIZE /* system size: # of 16-byte clicks */
- /* to be loaded */
-ROOT_DEV = 0 /* ROOT_DEV is now written by "build" */
-SWAP_DEV = 0 /* SWAP_DEV is now written by "build" */
-
-#ifndef SVGA_MODE
-#define SVGA_MODE ASK_VGA
-#endif
-
-#ifndef RAMDISK
-#define RAMDISK 0
-#endif
-
-#ifndef ROOT_RDONLY
-#define ROOT_RDONLY 1
-#endif
-
-.code16
-.text
-
-.global _start
-_start:
-
- # Normalize the start address
- jmpl $BOOTSEG, $start2
-
-start2:
- movw %cs, %ax
- movw %ax, %ds
- movw %ax, %es
- movw %ax, %ss
- movw $0x7c00, %sp
- sti
- cld
-
- movw $bugger_off_msg, %si
-
-msg_loop:
- lodsb
- andb %al, %al
- jz die
- movb $0xe, %ah
- movw $7, %bx
- int $0x10
- jmp msg_loop
-
-die:
- # Allow the user to press a key, then reboot
- xorw %ax, %ax
- int $0x16
- int $0x19
-
- # int 0x19 should never return. In case it does anyway,
- # invoke the BIOS reset code...
- ljmp $0xf000,$0xfff0
-
-
-bugger_off_msg:
- .ascii "Direct booting from floppy is no longer supported.\r\n"
- .ascii "Please use a boot loader program instead.\r\n"
- .ascii "\n"
- .ascii "Remove disk and press any key to reboot . . .\r\n"
- .byte 0
-
-
- # Kernel attributes; used by setup
-
- .org 497
-setup_sects: .byte SETUPSECTS
-root_flags: .word ROOT_RDONLY
-syssize: .word SYSSIZE
-swap_dev: .word SWAP_DEV
-ram_size: .word RAMDISK
-vid_mode: .word SVGA_MODE
-root_dev: .word ROOT_DEV
-boot_flag: .word 0xAA55
+++ /dev/null
-/*
- * BIOS Enhanced Disk Drive support
- * Copyright (C) 2002, 2003, 2004 Dell, Inc.
- * by Matt Domsch <Matt_Domsch@dell.com> October 2002
- * conformant to T13 Committee www.t13.org
- * projects 1572D, 1484D, 1386D, 1226DT
- * disk signature read by Matt Domsch <Matt_Domsch@dell.com>
- * and Andrew Wilks <Andrew_Wilks@dell.com> September 2003, June 2004
- * legacy CHS retrieval by Patrick J. LoPresti <patl@users.sourceforge.net>
- * March 2004
- * Command line option parsing, Matt Domsch, November 2004
- */
-
-#include <linux/edd.h>
-#include <asm/setup.h>
-
-#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
-
-# It is assumed that %ds == INITSEG here
-
- movb $0, (EDD_MBR_SIG_NR_BUF)
- movb $0, (EDDNR)
-
-# Check the command line for options:
-# edd=of disables EDD completely (edd=off)
-# edd=sk skips the MBR test (edd=skipmbr)
-# edd=on re-enables EDD (edd=on)
-
- pushl %esi
- movw $edd_mbr_sig_start, %di # Default to edd=on
-
- movl %cs:(cmd_line_ptr), %esi
- andl %esi, %esi
- jz old_cl # Old boot protocol?
-
-# Convert to a real-mode pointer in fs:si
- movl %esi, %eax
- shrl $4, %eax
- movw %ax, %fs
- andw $0xf, %si
- jmp have_cl_pointer
-
-# Old-style boot protocol?
-old_cl:
- push %ds # aka INITSEG
- pop %fs
-
- cmpw $0xa33f, (0x20)
- jne done_cl # No command line at all?
- movw (0x22), %si # Pointer relative to INITSEG
-
-# fs:si has the pointer to the command line now
-have_cl_pointer:
-
-# Loop through kernel command line one byte at a time. Just in
-# case the loader is buggy and failed to null-terminate the command line
-# terminate if we get close enough to the end of the segment that we
-# cannot fit "edd=XX"...
-cl_atspace:
- cmpw $-5, %si # Watch for segment wraparound
- jae done_cl
- movl %fs:(%si), %eax
- andb %al, %al # End of line?
- jz done_cl
- cmpl $EDD_CL_EQUALS, %eax
- jz found_edd_equals
- cmpb $0x20, %al # <= space consider whitespace
- ja cl_skipword
- incw %si
- jmp cl_atspace
-
-cl_skipword:
- cmpw $-5, %si # Watch for segment wraparound
- jae done_cl
- movb %fs:(%si), %al # End of string?
- andb %al, %al
- jz done_cl
- cmpb $0x20, %al
- jbe cl_atspace
- incw %si
- jmp cl_skipword
-
-found_edd_equals:
-# only looking at first two characters after equals
-# late overrides early on the command line, so keep going after finding something
- movw %fs:4(%si), %ax
- cmpw $EDD_CL_OFF, %ax # edd=of
- je do_edd_off
- cmpw $EDD_CL_SKIP, %ax # edd=sk
- je do_edd_skipmbr
- cmpw $EDD_CL_ON, %ax # edd=on
- je do_edd_on
- jmp cl_skipword
-do_edd_skipmbr:
- movw $edd_start, %di
- jmp cl_skipword
-do_edd_off:
- movw $edd_done, %di
- jmp cl_skipword
-do_edd_on:
- movw $edd_mbr_sig_start, %di
- jmp cl_skipword
-
-done_cl:
- popl %esi
- jmpw *%di
-
-# Read the first sector of each BIOS disk device and store the 4-byte signature
-edd_mbr_sig_start:
- movb $0x80, %dl # from device 80
- movw $EDD_MBR_SIG_BUF, %bx # store buffer ptr in bx
-edd_mbr_sig_read:
- movl $0xFFFFFFFF, %eax
- movl %eax, (%bx) # assume failure
- pushw %bx
- movb $READ_SECTORS, %ah
- movb $1, %al # read 1 sector
- movb $0, %dh # at head 0
- movw $1, %cx # cylinder 0, sector 0
- pushw %es
- pushw %ds
- popw %es
- movw $EDDBUF, %bx # disk's data goes into EDDBUF
- pushw %dx # work around buggy BIOSes
- stc # work around buggy BIOSes
- int $0x13
- sti # work around buggy BIOSes
- popw %dx
- popw %es
- popw %bx
- jc edd_mbr_sig_done # on failure, we're done.
- cmpb $0, %ah # some BIOSes do not set CF
- jne edd_mbr_sig_done # on failure, we're done.
- movl (EDDBUF+EDD_MBR_SIG_OFFSET), %eax # read sig out of the MBR
- movl %eax, (%bx) # store success
- incb (EDD_MBR_SIG_NR_BUF) # note that we stored something
- incb %dl # increment to next device
- addw $4, %bx # increment sig buffer ptr
- cmpb $EDD_MBR_SIG_MAX, (EDD_MBR_SIG_NR_BUF) # Out of space?
- jb edd_mbr_sig_read # keep looping
-edd_mbr_sig_done:
-
-# Do the BIOS Enhanced Disk Drive calls
-# This consists of two calls:
-# int 13h ah=41h "Check Extensions Present"
-# int 13h ah=48h "Get Device Parameters"
-# int 13h ah=08h "Legacy Get Device Parameters"
-#
-# A buffer of size EDDMAXNR*(EDDEXTSIZE+EDDPARMSIZE) is reserved for our use
-# in the boot_params at EDDBUF. The first four bytes of which are
-# used to store the device number, interface support map and version
-# results from fn41. The next four bytes are used to store the legacy
-# cylinders, heads, and sectors from fn08. The following 74 bytes are used to
-# store the results from fn48. Starting from device 80h, fn41, then fn48
-# are called and their results stored in EDDBUF+n*(EDDEXTSIZE+EDDPARMIZE).
-# Then the pointer is incremented to store the data for the next call.
-# This repeats until either a device doesn't exist, or until EDDMAXNR
-# devices have been stored.
-# The one tricky part is that ds:si always points EDDEXTSIZE bytes into
-# the structure, and the fn41 and fn08 results are stored at offsets
-# from there. This removes the need to increment the pointer for
-# every store, and leaves it ready for the fn48 call.
-# A second one-byte buffer, EDDNR, in the boot_params stores
-# the number of BIOS devices which exist, up to EDDMAXNR.
-# In setup.c, copy_edd() stores both boot_params buffers away
-# for later use, as they would get overwritten otherwise.
-# This code is sensitive to the size of the structs in edd.h
-edd_start:
- # %ds points to the bootsector
- # result buffer for fn48
- movw $EDDBUF+EDDEXTSIZE, %si # in ds:si, fn41 results
- # kept just before that
- movb $0x80, %dl # BIOS device 0x80
-
-edd_check_ext:
- movb $CHECKEXTENSIONSPRESENT, %ah # Function 41
- movw $EDDMAGIC1, %bx # magic
- int $0x13 # make the call
- jc edd_done # no more BIOS devices
-
- cmpw $EDDMAGIC2, %bx # is magic right?
- jne edd_next # nope, next...
-
- movb %dl, %ds:-8(%si) # store device number
- movb %ah, %ds:-7(%si) # store version
- movw %cx, %ds:-6(%si) # store extensions
- incb (EDDNR) # note that we stored something
-
-edd_get_device_params:
- movw $EDDPARMSIZE, %ds:(%si) # put size
- movw $0x0, %ds:2(%si) # work around buggy BIOSes
- movb $GETDEVICEPARAMETERS, %ah # Function 48
- int $0x13 # make the call
- # Don't check for fail return
- # it doesn't matter.
-edd_get_legacy_chs:
- xorw %ax, %ax
- movw %ax, %ds:-4(%si)
- movw %ax, %ds:-2(%si)
- # Ralf Brown's Interrupt List says to set ES:DI to
- # 0000h:0000h "to guard against BIOS bugs"
- pushw %es
- movw %ax, %es
- movw %ax, %di
- pushw %dx # legacy call clobbers %dl
- movb $LEGACYGETDEVICEPARAMETERS, %ah # Function 08
- int $0x13 # make the call
- jc edd_legacy_done # failed
- movb %cl, %al # Low 6 bits are max
- andb $0x3F, %al # sector number
- movb %al, %ds:-1(%si) # Record max sect
- movb %dh, %ds:-2(%si) # Record max head number
- movb %ch, %al # Low 8 bits of max cyl
- shr $6, %cl
- movb %cl, %ah # High 2 bits of max cyl
- movw %ax, %ds:-4(%si)
-
-edd_legacy_done:
- popw %dx
- popw %es
- movw %si, %ax # increment si
- addw $EDDPARMSIZE+EDDEXTSIZE, %ax
- movw %ax, %si
-
-edd_next:
- incb %dl # increment to next device
- cmpb $EDDMAXNR, (EDDNR) # Out of space?
- jb edd_check_ext # keep looping
-
-edd_done:
-#endif
+++ /dev/null
-/*
- * setup.S Copyright (C) 1991, 1992 Linus Torvalds
- *
- * setup.s is responsible for getting the system data from the BIOS,
- * and putting them into the appropriate places in system memory.
- * both setup.s and system has been loaded by the bootblock.
- *
- * This code asks the bios for memory/disk/other parameters, and
- * puts them in a "safe" place: 0x90000-0x901FF, ie where the
- * boot-block used to be. It is then up to the protected mode
- * system to read them from there before the area is overwritten
- * for buffer-blocks.
- *
- * Move PS/2 aux init code to psaux.c
- * (troyer@saifr00.cfsat.Honeywell.COM) 03Oct92
- *
- * some changes and additional features by Christoph Niemann,
- * March 1993/June 1994 (Christoph.Niemann@linux.org)
- *
- * add APM BIOS checking by Stephen Rothwell, May 1994
- * (sfr@canb.auug.org.au)
- *
- * High load stuff, initrd support and position independency
- * by Hans Lermen & Werner Almesberger, February 1996
- * <lermen@elserv.ffm.fgan.de>, <almesber@lrc.epfl.ch>
- *
- * Video handling moved to video.S by Martin Mares, March 1996
- * <mj@k332.feld.cvut.cz>
- *
- * Extended memory detection scheme retwiddled by orc@pell.chi.il.us (david
- * parsons) to avoid loadlin confusion, July 1997
- *
- * Transcribed from Intel (as86) -> AT&T (gas) by Chris Noe, May 1999.
- * <stiker@northlink.com>
- *
- * Fix to work around buggy BIOSes which don't use carry bit correctly
- * and/or report extended memory in CX/DX for e801h memory size detection
- * call. As a result the kernel got wrong figures. The int15/e801h docs
- * from Ralf Brown interrupt list seem to indicate AX/BX should be used
- * anyway. So to avoid breaking many machines (presumably there was a reason
- * to orginally use CX/DX instead of AX/BX), we do a kludge to see
- * if CX/DX have been changed in the e801 call and if so use AX/BX .
- * Michael Miller, April 2001 <michaelm@mjmm.org>
- *
- * New A20 code ported from SYSLINUX by H. Peter Anvin. AMD Elan bugfixes
- * by Robert Schwebel, December 2001 <robert@schwebel.de>
- */
-
-#include <asm/segment.h>
-#include <linux/utsrelease.h>
-#include <linux/compile.h>
-#include <asm/boot.h>
-#include <asm/e820.h>
-#include <asm/page.h>
-#include <asm/setup.h>
-
-/* Signature words to ensure LILO loaded us right */
-#define SIG1 0xAA55
-#define SIG2 0x5A5A
-
-INITSEG = DEF_INITSEG # 0x9000, we move boot here, out of the way
-SYSSEG = DEF_SYSSEG # 0x1000, system loaded at 0x10000 (65536).
-SETUPSEG = DEF_SETUPSEG # 0x9020, this is the current segment
- # ... and the former contents of CS
-
-DELTA_INITSEG = SETUPSEG - INITSEG # 0x0020
-
-.code16
-.globl begtext, begdata, begbss, endtext, enddata, endbss
-
-.text
-begtext:
-.data
-begdata:
-.bss
-begbss:
-.text
-
-start:
- jmp trampoline
-
-# This is the setup header, and it must start at %cs:2 (old 0x9020:2)
-
- .ascii "HdrS" # header signature
- .word 0x0206 # header version number (>= 0x0105)
- # or else old loadlin-1.5 will fail)
-realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
-start_sys_seg: .word SYSSEG
- .word kernel_version # pointing to kernel version string
- # above section of header is compatible
- # with loadlin-1.5 (header v1.5). Don't
- # change it.
-
-type_of_loader: .byte 0 # = 0, old one (LILO, Loadlin,
- # Bootlin, SYSLX, bootsect...)
- # See Documentation/i386/boot.txt for
- # assigned ids
-
-# flags, unused bits must be zero (RFU) bit within loadflags
-loadflags:
-LOADED_HIGH = 1 # If set, the kernel is loaded high
-CAN_USE_HEAP = 0x80 # If set, the loader also has set
- # heap_end_ptr to tell how much
- # space behind setup.S can be used for
- # heap purposes.
- # Only the loader knows what is free
-#ifndef __BIG_KERNEL__
- .byte 0
-#else
- .byte LOADED_HIGH
-#endif
-
-setup_move_size: .word 0x8000 # size to move, when setup is not
- # loaded at 0x90000. We will move setup
- # to 0x90000 then just before jumping
- # into the kernel. However, only the
- # loader knows how much data behind
- # us also needs to be loaded.
-
-code32_start: # here loaders can put a different
- # start address for 32-bit code.
-#ifndef __BIG_KERNEL__
- .long 0x1000 # 0x1000 = default for zImage
-#else
- .long 0x100000 # 0x100000 = default for big kernel
-#endif
-
-ramdisk_image: .long 0 # address of loaded ramdisk image
- # Here the loader puts the 32-bit
- # address where it loaded the image.
- # This only will be read by the kernel.
-
-ramdisk_size: .long 0 # its size in bytes
-
-bootsect_kludge:
- .long 0 # obsolete
-
-heap_end_ptr: .word modelist+1024 # (Header version 0x0201 or later)
- # space from here (exclusive) down to
- # end of setup code can be used by setup
- # for local heap purposes.
-
-pad1: .word 0
-cmd_line_ptr: .long 0 # (Header version 0x0202 or later)
- # If nonzero, a 32-bit pointer
- # to the kernel command line.
- # The command line should be
- # located between the start of
- # setup and the end of low
- # memory (0xa0000), or it may
- # get overwritten before it
- # gets read. If this field is
- # used, there is no longer
- # anything magical about the
- # 0x90000 segment; the setup
- # can be located anywhere in
- # low memory 0x10000 or higher.
-
-ramdisk_max: .long (-__PAGE_OFFSET-(512 << 20)-1) & 0x7fffffff
- # (Header version 0x0203 or later)
- # The highest safe address for
- # the contents of an initrd
-
-kernel_alignment: .long CONFIG_PHYSICAL_ALIGN #physical addr alignment
- #required for protected mode
- #kernel
-#ifdef CONFIG_RELOCATABLE
-relocatable_kernel: .byte 1
-#else
-relocatable_kernel: .byte 0
-#endif
-pad2: .byte 0
-pad3: .word 0
-
-cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line,
- #added with boot protocol
- #version 2.06
-
-trampoline: call start_of_setup
- .align 16
- # The offset at this point is 0x240
- .space (0xeff-0x240+1) # E820 & EDD space (ending at 0xeff)
-# End of setup header #####################################################
-
-start_of_setup:
-# Bootlin depends on this being done early
- movw $0x01500, %ax
- movb $0x81, %dl
- int $0x13
-
-#ifdef SAFE_RESET_DISK_CONTROLLER
-# Reset the disk controller.
- movw $0x0000, %ax
- movb $0x80, %dl
- int $0x13
-#endif
-
-# Set %ds = %cs, we know that SETUPSEG = %cs at this point
- movw %cs, %ax # aka SETUPSEG
- movw %ax, %ds
-# Check signature at end of setup
- cmpw $SIG1, setup_sig1
- jne bad_sig
-
- cmpw $SIG2, setup_sig2
- jne bad_sig
-
- jmp good_sig1
-
-# Routine to print asciiz string at ds:si
-prtstr:
- lodsb
- andb %al, %al
- jz fin
-
- call prtchr
- jmp prtstr
-
-fin: ret
-
-# Space printing
-prtsp2: call prtspc # Print double space
-prtspc: movb $0x20, %al # Print single space (note: fall-thru)
-
-# Part of above routine, this one just prints ascii al
-prtchr: pushw %ax
- pushw %cx
- movw $7,%bx
- movw $0x01, %cx
- movb $0x0e, %ah
- int $0x10
- popw %cx
- popw %ax
- ret
-
-beep: movb $0x07, %al
- jmp prtchr
-
-no_sig_mess: .string "No setup signature found ..."
-
-good_sig1:
- jmp good_sig
-
-# We now have to find the rest of the setup code/data
-bad_sig:
- movw %cs, %ax # SETUPSEG
- subw $DELTA_INITSEG, %ax # INITSEG
- movw %ax, %ds
- xorb %bh, %bh
- movb (497), %bl # get setup sect from bootsect
- subw $4, %bx # LILO loads 4 sectors of setup
- shlw $8, %bx # convert to words (1sect=2^8 words)
- movw %bx, %cx
- shrw $3, %bx # convert to segment
- addw $SYSSEG, %bx
- movw %bx, %cs:start_sys_seg
-# Move rest of setup code/data to here
- movw $2048, %di # four sectors loaded by LILO
- subw %si, %si
- pushw %cs
- popw %es
- movw $SYSSEG, %ax
- movw %ax, %ds
- rep
- movsw
- movw %cs, %ax # aka SETUPSEG
- movw %ax, %ds
- cmpw $SIG1, setup_sig1
- jne no_sig
-
- cmpw $SIG2, setup_sig2
- jne no_sig
-
- jmp good_sig
-
-no_sig:
- lea no_sig_mess, %si
- call prtstr
-
-no_sig_loop:
- hlt
- jmp no_sig_loop
-
-good_sig:
- movw %cs, %ax # aka SETUPSEG
- subw $DELTA_INITSEG, %ax # aka INITSEG
- movw %ax, %ds
-# Check if an old loader tries to load a big-kernel
- testb $LOADED_HIGH, %cs:loadflags # Do we have a big kernel?
- jz loader_ok # No, no danger for old loaders.
-
- cmpb $0, %cs:type_of_loader # Do we have a loader that
- # can deal with us?
- jnz loader_ok # Yes, continue.
-
- pushw %cs # No, we have an old loader,
- popw %ds # die.
- lea loader_panic_mess, %si
- call prtstr
-
- jmp no_sig_loop
-
-loader_panic_mess: .string "Wrong loader, giving up..."
-
-# check minimum cpuid
-# we do this here because it is the last place we can actually
-# show a user visible error message. Later the video modus
-# might be already messed up.
-loader_ok:
- call verify_cpu
- testl %eax,%eax
- jz cpu_ok
- movw %cs,%ax # aka SETUPSEG
- movw %ax,%ds
- lea cpu_panic_mess,%si
- call prtstr
-1: jmp 1b
-
-cpu_panic_mess:
- .asciz "PANIC: CPU too old for this kernel."
-
-#include "../kernel/verify_cpu.S"
-
-cpu_ok:
-# Get memory size (extended mem, kB)
-
- xorl %eax, %eax
- movl %eax, (0x1e0)
-#ifndef STANDARD_MEMORY_BIOS_CALL
- movb %al, (E820NR)
-# Try three different memory detection schemes. First, try
-# e820h, which lets us assemble a memory map, then try e801h,
-# which returns a 32-bit memory size, and finally 88h, which
-# returns 0-64m
-
-# method E820H:
-# the memory map from hell. e820h returns memory classified into
-# a whole bunch of different types, and allows memory holes and
-# everything. We scan through this memory map and build a list
-# of the first 32 memory areas, which we return at [E820MAP].
-# This is documented at http://www.acpi.info/, in the ACPI 2.0 specification.
-
-#define SMAP 0x534d4150
-
-meme820:
- xorl %ebx, %ebx # continuation counter
- movw $E820MAP, %di # point into the whitelist
- # so we can have the bios
- # directly write into it.
-
-jmpe820:
- movl $0x0000e820, %eax # e820, upper word zeroed
- movl $SMAP, %edx # ascii 'SMAP'
- movl $20, %ecx # size of the e820rec
- pushw %ds # data record.
- popw %es
- int $0x15 # make the call
- jc bail820 # fall to e801 if it fails
-
- cmpl $SMAP, %eax # check the return is `SMAP'
- jne bail820 # fall to e801 if it fails
-
-# cmpl $1, 16(%di) # is this usable memory?
-# jne again820
-
- # If this is usable memory, we save it by simply advancing %di by
- # sizeof(e820rec).
- #
-good820:
- movb (E820NR), %al # up to 128 entries
- cmpb $E820MAX, %al
- jae bail820
-
- incb (E820NR)
- movw %di, %ax
- addw $20, %ax
- movw %ax, %di
-again820:
- cmpl $0, %ebx # check to see if
- jne jmpe820 # %ebx is set to EOF
-bail820:
-
-
-# method E801H:
-# memory size is in 1k chunksizes, to avoid confusing loadlin.
-# we store the 0xe801 memory size in a completely different place,
-# because it will most likely be longer than 16 bits.
-# (use 1e0 because that's what Larry Augustine uses in his
-# alternative new memory detection scheme, and it's sensible
-# to write everything into the same place.)
-
-meme801:
- stc # fix to work around buggy
- xorw %cx,%cx # BIOSes which don't clear/set
- xorw %dx,%dx # carry on pass/error of
- # e801h memory size call
- # or merely pass cx,dx though
- # without changing them.
- movw $0xe801, %ax
- int $0x15
- jc mem88
-
- cmpw $0x0, %cx # Kludge to handle BIOSes
- jne e801usecxdx # which report their extended
- cmpw $0x0, %dx # memory in AX/BX rather than
- jne e801usecxdx # CX/DX. The spec I have read
- movw %ax, %cx # seems to indicate AX/BX
- movw %bx, %dx # are more reasonable anyway...
-
-e801usecxdx:
- andl $0xffff, %edx # clear sign extend
- shll $6, %edx # and go from 64k to 1k chunks
- movl %edx, (0x1e0) # store extended memory size
- andl $0xffff, %ecx # clear sign extend
- addl %ecx, (0x1e0) # and add lower memory into
- # total size.
-
-# Ye Olde Traditional Methode. Returns the memory size (up to 16mb or
-# 64mb, depending on the bios) in ax.
-mem88:
-
-#endif
- movb $0x88, %ah
- int $0x15
- movw %ax, (2)
-
-# Set the keyboard repeat rate to the max
- movw $0x0305, %ax
- xorw %bx, %bx
- int $0x16
-
-# Check for video adapter and its parameters and allow the
-# user to browse video modes.
- call video # NOTE: we need %ds pointing
- # to bootsector
-
-# Get hd0 data...
- xorw %ax, %ax
- movw %ax, %ds
- ldsw (4 * 0x41), %si
- movw %cs, %ax # aka SETUPSEG
- subw $DELTA_INITSEG, %ax # aka INITSEG
- pushw %ax
- movw %ax, %es
- movw $0x0080, %di
- movw $0x10, %cx
- pushw %cx
- cld
- rep
- movsb
-# Get hd1 data...
- xorw %ax, %ax
- movw %ax, %ds
- ldsw (4 * 0x46), %si
- popw %cx
- popw %es
- movw $0x0090, %di
- rep
- movsb
-# Check that there IS a hd1 :-)
- movw $0x01500, %ax
- movb $0x81, %dl
- int $0x13
- jc no_disk1
-
- cmpb $3, %ah
- je is_disk1
-
-no_disk1:
- movw %cs, %ax # aka SETUPSEG
- subw $DELTA_INITSEG, %ax # aka INITSEG
- movw %ax, %es
- movw $0x0090, %di
- movw $0x10, %cx
- xorw %ax, %ax
- cld
- rep
- stosb
-is_disk1:
-# check for Micro Channel (MCA) bus
- movw %cs, %ax # aka SETUPSEG
- subw $DELTA_INITSEG, %ax # aka INITSEG
- movw %ax, %ds
- xorw %ax, %ax
- movw %ax, (0xa0) # set table length to 0
- movb $0xc0, %ah
- stc
- int $0x15 # moves feature table to es:bx
- jc no_mca
-
- pushw %ds
- movw %es, %ax
- movw %ax, %ds
- movw %cs, %ax # aka SETUPSEG
- subw $DELTA_INITSEG, %ax # aka INITSEG
- movw %ax, %es
- movw %bx, %si
- movw $0xa0, %di
- movw (%si), %cx
- addw $2, %cx # table length is a short
- cmpw $0x10, %cx
- jc sysdesc_ok
-
- movw $0x10, %cx # we keep only first 16 bytes
-sysdesc_ok:
- rep
- movsb
- popw %ds
-no_mca:
-#ifdef CONFIG_X86_VOYAGER
- movb $0xff, 0x40 # flag on config found
- movb $0xc0, %al
- mov $0xff, %ah
- int $0x15 # put voyager config info at es:di
- jc no_voyager
- movw $0x40, %si # place voyager info in apm table
- cld
- movw $7, %cx
-voyager_rep:
- movb %es:(%di), %al
- movb %al,(%si)
- incw %di
- incw %si
- decw %cx
- jnz voyager_rep
-no_voyager:
-#endif
-# Check for PS/2 pointing device
- movw %cs, %ax # aka SETUPSEG
- subw $DELTA_INITSEG, %ax # aka INITSEG
- movw %ax, %ds
- movb $0, (0x1ff) # default is no pointing device
- int $0x11 # int 0x11: equipment list
- testb $0x04, %al # check if mouse installed
- jz no_psmouse
-
- movb $0xAA, (0x1ff) # device present
-no_psmouse:
-
-#if defined(CONFIG_X86_SPEEDSTEP_SMI) || defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
- movl $0x0000E980, %eax # IST Support
- movl $0x47534943, %edx # Request value
- int $0x15
-
- movl %eax, (96)
- movl %ebx, (100)
- movl %ecx, (104)
- movl %edx, (108)
-#endif
-
-#if defined(CONFIG_APM) || defined(CONFIG_APM_MODULE)
-# Then check for an APM BIOS...
- # %ds points to the bootsector
- movw $0, 0x40 # version = 0 means no APM BIOS
- movw $0x05300, %ax # APM BIOS installation check
- xorw %bx, %bx
- int $0x15
- jc done_apm_bios # Nope, no APM BIOS
-
- cmpw $0x0504d, %bx # Check for "PM" signature
- jne done_apm_bios # No signature, no APM BIOS
-
- andw $0x02, %cx # Is 32 bit supported?
- je done_apm_bios # No 32-bit, no (good) APM BIOS
-
- movw $0x05304, %ax # Disconnect first just in case
- xorw %bx, %bx
- int $0x15 # ignore return code
- movw $0x05303, %ax # 32 bit connect
- xorl %ebx, %ebx
- xorw %cx, %cx # paranoia :-)
- xorw %dx, %dx # ...
- xorl %esi, %esi # ...
- xorw %di, %di # ...
- int $0x15
- jc no_32_apm_bios # Ack, error.
-
- movw %ax, (66) # BIOS code segment
- movl %ebx, (68) # BIOS entry point offset
- movw %cx, (72) # BIOS 16 bit code segment
- movw %dx, (74) # BIOS data segment
- movl %esi, (78) # BIOS code segment lengths
- movw %di, (82) # BIOS data segment length
-# Redo the installation check as the 32 bit connect
-# modifies the flags returned on some BIOSs
- movw $0x05300, %ax # APM BIOS installation check
- xorw %bx, %bx
- xorw %cx, %cx # paranoia
- int $0x15
- jc apm_disconnect # error -> shouldn't happen
-
- cmpw $0x0504d, %bx # check for "PM" signature
- jne apm_disconnect # no sig -> shouldn't happen
-
- movw %ax, (64) # record the APM BIOS version
- movw %cx, (76) # and flags
- jmp done_apm_bios
-
-apm_disconnect: # Tidy up
- movw $0x05304, %ax # Disconnect
- xorw %bx, %bx
- int $0x15 # ignore return code
-
- jmp done_apm_bios
-
-no_32_apm_bios:
- andw $0xfffd, (76) # remove 32 bit support bit
-done_apm_bios:
-#endif
-
-#include "edd.S"
-
-# Now we want to move to protected mode ...
- cmpw $0, %cs:realmode_swtch
- jz rmodeswtch_normal
-
- lcall *%cs:realmode_swtch
-
- jmp rmodeswtch_end
-
-rmodeswtch_normal:
- pushw %cs
- call default_switch
-
-rmodeswtch_end:
-# Now we move the system to its rightful place ... but we check if we have a
-# big-kernel. In that case we *must* not move it ...
- testb $LOADED_HIGH, %cs:loadflags
- jz do_move0 # .. then we have a normal low
- # loaded zImage
- # .. or else we have a high
- # loaded bzImage
- jmp end_move # ... and we skip moving
-
-do_move0:
- movw $0x100, %ax # start of destination segment
- movw %cs, %bp # aka SETUPSEG
- subw $DELTA_INITSEG, %bp # aka INITSEG
- movw %cs:start_sys_seg, %bx # start of source segment
- cld
-do_move:
- movw %ax, %es # destination segment
- incb %ah # instead of add ax,#0x100
- movw %bx, %ds # source segment
- addw $0x100, %bx
- subw %di, %di
- subw %si, %si
- movw $0x800, %cx
- rep
- movsw
- cmpw %bp, %bx # assume start_sys_seg > 0x200,
- # so we will perhaps read one
- # page more than needed, but
- # never overwrite INITSEG
- # because destination is a
- # minimum one page below source
- jb do_move
-
-end_move:
-# then we load the segment descriptors
- movw %cs, %ax # aka SETUPSEG
- movw %ax, %ds
-
-# Check whether we need to be downward compatible with version <=201
- cmpl $0, cmd_line_ptr
- jne end_move_self # loader uses version >=202 features
- cmpb $0x20, type_of_loader
- je end_move_self # bootsect loader, we know of it
-
-# Boot loader doesnt support boot protocol version 2.02.
-# If we have our code not at 0x90000, we need to move it there now.
-# We also then need to move the params behind it (commandline)
-# Because we would overwrite the code on the current IP, we move
-# it in two steps, jumping high after the first one.
- movw %cs, %ax
- cmpw $SETUPSEG, %ax
- je end_move_self
-
- cli # make sure we really have
- # interrupts disabled !
- # because after this the stack
- # should not be used
- subw $DELTA_INITSEG, %ax # aka INITSEG
- movw %ss, %dx
- cmpw %ax, %dx
- jb move_self_1
-
- addw $INITSEG, %dx
- subw %ax, %dx # this will go into %ss after
- # the move
-move_self_1:
- movw %ax, %ds
- movw $INITSEG, %ax # real INITSEG
- movw %ax, %es
- movw %cs:setup_move_size, %cx
- std # we have to move up, so we use
- # direction down because the
- # areas may overlap
- movw %cx, %di
- decw %di
- movw %di, %si
- subw $move_self_here+0x200, %cx
- rep
- movsb
- ljmp $SETUPSEG, $move_self_here
-
-move_self_here:
- movw $move_self_here+0x200, %cx
- rep
- movsb
- movw $SETUPSEG, %ax
- movw %ax, %ds
- movw %dx, %ss
-end_move_self: # now we are at the right place
-
-#
-# Enable A20. This is at the very best an annoying procedure.
-# A20 code ported from SYSLINUX 1.52-1.63 by H. Peter Anvin.
-# AMD Elan bug fix by Robert Schwebel.
-#
-
-#if defined(CONFIG_X86_ELAN)
- movb $0x02, %al # alternate A20 gate
- outb %al, $0x92 # this works on SC410/SC520
-a20_elan_wait:
- call a20_test
- jz a20_elan_wait
- jmp a20_done
-#endif
-
-
-A20_TEST_LOOPS = 32 # Iterations per wait
-A20_ENABLE_LOOPS = 255 # Total loops to try
-
-
-#ifndef CONFIG_X86_VOYAGER
-a20_try_loop:
-
- # First, see if we are on a system with no A20 gate.
-a20_none:
- call a20_test
- jnz a20_done
-
- # Next, try the BIOS (INT 0x15, AX=0x2401)
-a20_bios:
- movw $0x2401, %ax
- pushfl # Be paranoid about flags
- int $0x15
- popfl
-
- call a20_test
- jnz a20_done
-
- # Try enabling A20 through the keyboard controller
-#endif /* CONFIG_X86_VOYAGER */
-a20_kbc:
- call empty_8042
-
-#ifndef CONFIG_X86_VOYAGER
- call a20_test # Just in case the BIOS worked
- jnz a20_done # but had a delayed reaction.
-#endif
-
- movb $0xD1, %al # command write
- outb %al, $0x64
- call empty_8042
-
- movb $0xDF, %al # A20 on
- outb %al, $0x60
- call empty_8042
-
-#ifndef CONFIG_X86_VOYAGER
- # Wait until a20 really *is* enabled; it can take a fair amount of
- # time on certain systems; Toshiba Tecras are known to have this
- # problem.
-a20_kbc_wait:
- xorw %cx, %cx
-a20_kbc_wait_loop:
- call a20_test
- jnz a20_done
- loop a20_kbc_wait_loop
-
- # Final attempt: use "configuration port A"
-a20_fast:
- inb $0x92, %al # Configuration Port A
- orb $0x02, %al # "fast A20" version
- andb $0xFE, %al # don't accidentally reset
- outb %al, $0x92
-
- # Wait for configuration port A to take effect
-a20_fast_wait:
- xorw %cx, %cx
-a20_fast_wait_loop:
- call a20_test
- jnz a20_done
- loop a20_fast_wait_loop
-
- # A20 is still not responding. Try frobbing it again.
- #
- decb (a20_tries)
- jnz a20_try_loop
-
- movw $a20_err_msg, %si
- call prtstr
-
-a20_die:
- hlt
- jmp a20_die
-
-a20_tries:
- .byte A20_ENABLE_LOOPS
-
-a20_err_msg:
- .ascii "linux: fatal error: A20 gate not responding!"
- .byte 13, 10, 0
-
- # If we get here, all is good
-a20_done:
-
-#endif /* CONFIG_X86_VOYAGER */
-# set up gdt and idt and 32bit start address
- lidt idt_48 # load idt with 0,0
- xorl %eax, %eax # Compute gdt_base
- movw %ds, %ax # (Convert %ds:gdt to a linear ptr)
- shll $4, %eax
- addl %eax, code32
- addl $gdt, %eax
- movl %eax, (gdt_48+2)
- lgdt gdt_48 # load gdt with whatever is
- # appropriate
-
-# make sure any possible coprocessor is properly reset..
- xorw %ax, %ax
- outb %al, $0xf0
- call delay
-
- outb %al, $0xf1
- call delay
-
-# well, that went ok, I hope. Now we mask all interrupts - the rest
-# is done in init_IRQ().
- movb $0xFF, %al # mask all interrupts for now
- outb %al, $0xA1
- call delay
-
- movb $0xFB, %al # mask all irq's but irq2 which
- outb %al, $0x21 # is cascaded
-
-# Well, that certainly wasn't fun :-(. Hopefully it works, and we don't
-# need no steenking BIOS anyway (except for the initial loading :-).
-# The BIOS-routine wants lots of unnecessary data, and it's less
-# "interesting" anyway. This is how REAL programmers do it.
-#
-# Well, now's the time to actually move into protected mode. To make
-# things as simple as possible, we do no register set-up or anything,
-# we let the gnu-compiled 32-bit programs do that. We just jump to
-# absolute address 0x1000 (or the loader supplied one),
-# in 32-bit protected mode.
-#
-# Note that the short jump isn't strictly needed, although there are
-# reasons why it might be a good idea. It won't hurt in any case.
- movw $1, %ax # protected mode (PE) bit
- lmsw %ax # This is it!
- jmp flush_instr
-
-flush_instr:
- xorw %bx, %bx # Flag to indicate a boot
- xorl %esi, %esi # Pointer to real-mode code
- movw %cs, %si
- subw $DELTA_INITSEG, %si
- shll $4, %esi # Convert to 32-bit pointer
-
-# jump to startup_32 in arch/i386/boot/compressed/head.S
-#
-# NOTE: For high loaded big kernels we need a
-# jmpi 0x100000,__BOOT_CS
-#
-# but we yet haven't reloaded the CS register, so the default size
-# of the target offset still is 16 bit.
-# However, using an operand prefix (0x66), the CPU will properly
-# take our 48 bit far pointer. (INTeL 80386 Programmer's Reference
-# Manual, Mixing 16-bit and 32-bit code, page 16-6)
-
- .byte 0x66, 0xea # prefix + jmpi-opcode
-code32: .long startup_32 # will be set to %cs+startup_32
- .word __BOOT_CS
-.code32
-startup_32:
- movl $(__BOOT_DS), %eax
- movl %eax, %ds
- movl %eax, %es
- movl %eax, %fs
- movl %eax, %gs
- movl %eax, %ss
-
- xorl %eax, %eax
-1: incl %eax # check that A20 really IS enabled
- movl %eax, 0x00000000 # loop forever if it isn't
- cmpl %eax, 0x00100000
- je 1b
-
- # Jump to the 32bit entry point
- jmpl *(code32_start - start + (DELTA_INITSEG << 4))(%esi)
-.code16
-
-# Here's a bunch of information about your current kernel..
-kernel_version: .ascii UTS_RELEASE
- .ascii " ("
- .ascii LINUX_COMPILE_BY
- .ascii "@"
- .ascii LINUX_COMPILE_HOST
- .ascii ") "
- .ascii UTS_VERSION
- .byte 0
-
-# This is the default real mode switch routine.
-# to be called just before protected mode transition
-default_switch:
- cli # no interrupts allowed !
- movb $0x80, %al # disable NMI for bootup
- # sequence
- outb %al, $0x70
- lret
-
-
-#ifndef CONFIG_X86_VOYAGER
-# This routine tests whether or not A20 is enabled. If so, it
-# exits with zf = 0.
-#
-# The memory address used, 0x200, is the int $0x80 vector, which
-# should be safe.
-
-A20_TEST_ADDR = 4*0x80
-
-a20_test:
- pushw %cx
- pushw %ax
- xorw %cx, %cx
- movw %cx, %fs # Low memory
- decw %cx
- movw %cx, %gs # High memory area
- movw $A20_TEST_LOOPS, %cx
- movw %fs:(A20_TEST_ADDR), %ax
- pushw %ax
-a20_test_wait:
- incw %ax
- movw %ax, %fs:(A20_TEST_ADDR)
- call delay # Serialize and make delay constant
- cmpw %gs:(A20_TEST_ADDR+0x10), %ax
- loope a20_test_wait
-
- popw %fs:(A20_TEST_ADDR)
- popw %ax
- popw %cx
- ret
-
-#endif /* CONFIG_X86_VOYAGER */
-
-# This routine checks that the keyboard command queue is empty
-# (after emptying the output buffers)
-#
-# Some machines have delusions that the keyboard buffer is always full
-# with no keyboard attached...
-#
-# If there is no keyboard controller, we will usually get 0xff
-# to all the reads. With each IO taking a microsecond and
-# a timeout of 100,000 iterations, this can take about half a
-# second ("delay" == outb to port 0x80). That should be ok,
-# and should also be plenty of time for a real keyboard controller
-# to empty.
-#
-
-empty_8042:
- pushl %ecx
- movl $100000, %ecx
-
-empty_8042_loop:
- decl %ecx
- jz empty_8042_end_loop
-
- call delay
-
- inb $0x64, %al # 8042 status port
- testb $1, %al # output buffer?
- jz no_output
-
- call delay
- inb $0x60, %al # read it
- jmp empty_8042_loop
-
-no_output:
- testb $2, %al # is input buffer full?
- jnz empty_8042_loop # yes - loop
-empty_8042_end_loop:
- popl %ecx
- ret
-
-# Read the cmos clock. Return the seconds in al
-gettime:
- pushw %cx
- movb $0x02, %ah
- int $0x1a
- movb %dh, %al # %dh contains the seconds
- andb $0x0f, %al
- movb %dh, %ah
- movb $0x04, %cl
- shrb %cl, %ah
- aad
- popw %cx
- ret
-
-# Delay is needed after doing I/O
-delay:
- outb %al,$0x80
- ret
-
-# Descriptor tables
-#
-# NOTE: The intel manual says gdt should be sixteen bytes aligned for
-# efficiency reasons. However, there are machines which are known not
-# to boot with misaligned GDTs, so alter this at your peril! If you alter
-# GDT_ENTRY_BOOT_CS (in asm/segment.h) remember to leave at least two
-# empty GDT entries (one for NULL and one reserved).
-#
-# NOTE: On some CPUs, the GDT must be 8 byte aligned. This is
-# true for the Voyager Quad CPU card which will not boot without
-# This directive. 16 byte aligment is recommended by intel.
-#
- .align 16
-gdt:
- .fill GDT_ENTRY_BOOT_CS,8,0
-
- .word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb)
- .word 0 # base address = 0
- .word 0x9A00 # code read/exec
- .word 0x00CF # granularity = 4096, 386
- # (+5th nibble of limit)
-
- .word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb)
- .word 0 # base address = 0
- .word 0x9200 # data read/write
- .word 0x00CF # granularity = 4096, 386
- # (+5th nibble of limit)
-gdt_end:
- .align 4
-
- .word 0 # alignment byte
-idt_48:
- .word 0 # idt limit = 0
- .word 0, 0 # idt base = 0L
-
- .word 0 # alignment byte
-gdt_48:
- .word gdt_end - gdt - 1 # gdt limit
- .word 0, 0 # gdt base (filled in later)
-
-# Include video setup & detection code
-
-#include "video.S"
-
-# Setup signature -- must be last
-setup_sig1: .word SIG1
-setup_sig2: .word SIG2
-
-# After this point, there is some free space which is used by the video mode
-# handling code to store the temporary mode table (not used by the kernel).
-
-modelist:
-
-.text
-endtext:
-.data
-enddata:
-.bss
-endbss:
+++ /dev/null
-/* video.S
- *
- * Display adapter & video mode setup, version 2.13 (14-May-99)
- *
- * Copyright (C) 1995 -- 1998 Martin Mares <mj@ucw.cz>
- * Based on the original setup.S code (C) Linus Torvalds and Mats Anderson
- *
- * Rewritten to use GNU 'as' by Chris Noe <stiker@northlink.com> May 1999
- *
- * For further information, look at Documentation/svga.txt.
- *
- */
-
-/* Enable autodetection of SVGA adapters and modes. */
-#undef CONFIG_VIDEO_SVGA
-
-/* Enable autodetection of VESA modes */
-#define CONFIG_VIDEO_VESA
-
-/* Enable compacting of mode table */
-#define CONFIG_VIDEO_COMPACT
-
-/* Retain screen contents when switching modes */
-#define CONFIG_VIDEO_RETAIN
-
-/* Enable local mode list */
-#undef CONFIG_VIDEO_LOCAL
-
-/* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */
-#undef CONFIG_VIDEO_400_HACK
-
-/* Hack that lets you force specific BIOS mode ID and specific dimensions */
-#undef CONFIG_VIDEO_GFX_HACK
-#define VIDEO_GFX_BIOS_AX 0x4f02 /* 800x600 on ThinkPad */
-#define VIDEO_GFX_BIOS_BX 0x0102
-#define VIDEO_GFX_DUMMY_RESOLUTION 0x6425 /* 100x37 */
-
-/* This code uses an extended set of video mode numbers. These include:
- * Aliases for standard modes
- * NORMAL_VGA (-1)
- * EXTENDED_VGA (-2)
- * ASK_VGA (-3)
- * Video modes numbered by menu position -- NOT RECOMMENDED because of lack
- * of compatibility when extending the table. These are between 0x00 and 0xff.
- */
-#define VIDEO_FIRST_MENU 0x0000
-
-/* Standard BIOS video modes (BIOS number + 0x0100) */
-#define VIDEO_FIRST_BIOS 0x0100
-
-/* VESA BIOS video modes (VESA number + 0x0200) */
-#define VIDEO_FIRST_VESA 0x0200
-
-/* Video7 special modes (BIOS number + 0x0900) */
-#define VIDEO_FIRST_V7 0x0900
-
-/* Special video modes */
-#define VIDEO_FIRST_SPECIAL 0x0f00
-#define VIDEO_80x25 0x0f00
-#define VIDEO_8POINT 0x0f01
-#define VIDEO_80x43 0x0f02
-#define VIDEO_80x28 0x0f03
-#define VIDEO_CURRENT_MODE 0x0f04
-#define VIDEO_80x30 0x0f05
-#define VIDEO_80x34 0x0f06
-#define VIDEO_80x60 0x0f07
-#define VIDEO_GFX_HACK 0x0f08
-#define VIDEO_LAST_SPECIAL 0x0f09
-
-/* Video modes given by resolution */
-#define VIDEO_FIRST_RESOLUTION 0x1000
-
-/* The "recalculate timings" flag */
-#define VIDEO_RECALC 0x8000
-
-/* Positions of various video parameters passed to the kernel */
-/* (see also include/linux/tty.h) */
-#define PARAM_CURSOR_POS 0x00
-#define PARAM_VIDEO_PAGE 0x04
-#define PARAM_VIDEO_MODE 0x06
-#define PARAM_VIDEO_COLS 0x07
-#define PARAM_VIDEO_EGA_BX 0x0a
-#define PARAM_VIDEO_LINES 0x0e
-#define PARAM_HAVE_VGA 0x0f
-#define PARAM_FONT_POINTS 0x10
-
-#define PARAM_LFB_WIDTH 0x12
-#define PARAM_LFB_HEIGHT 0x14
-#define PARAM_LFB_DEPTH 0x16
-#define PARAM_LFB_BASE 0x18
-#define PARAM_LFB_SIZE 0x1c
-#define PARAM_LFB_LINELENGTH 0x24
-#define PARAM_LFB_COLORS 0x26
-#define PARAM_VESAPM_SEG 0x2e
-#define PARAM_VESAPM_OFF 0x30
-#define PARAM_LFB_PAGES 0x32
-#define PARAM_VESA_ATTRIB 0x34
-#define PARAM_CAPABILITIES 0x36
-
-/* Define DO_STORE according to CONFIG_VIDEO_RETAIN */
-#ifdef CONFIG_VIDEO_RETAIN
-#define DO_STORE call store_screen
-#else
-#define DO_STORE
-#endif /* CONFIG_VIDEO_RETAIN */
-
-# This is the main entry point called by setup.S
-# %ds *must* be pointing to the bootsector
-video: pushw %ds # We use different segments
- pushw %ds # FS contains original DS
- popw %fs
- pushw %cs # DS is equal to CS
- popw %ds
- pushw %cs # ES is equal to CS
- popw %es
- xorw %ax, %ax
- movw %ax, %gs # GS is zero
- cld
- call basic_detect # Basic adapter type testing (EGA/VGA/MDA/CGA)
-#ifdef CONFIG_VIDEO_SELECT
- movw %fs:(0x01fa), %ax # User selected video mode
- cmpw $ASK_VGA, %ax # Bring up the menu
- jz vid2
-
- call mode_set # Set the mode
- jc vid1
-
- leaw badmdt, %si # Invalid mode ID
- call prtstr
-vid2: call mode_menu
-vid1:
-#ifdef CONFIG_VIDEO_RETAIN
- call restore_screen # Restore screen contents
-#endif /* CONFIG_VIDEO_RETAIN */
- call store_edid
-#endif /* CONFIG_VIDEO_SELECT */
- call mode_params # Store mode parameters
- popw %ds # Restore original DS
- ret
-
-# Detect if we have CGA, MDA, EGA or VGA and pass it to the kernel.
-basic_detect:
- movb $0, %fs:(PARAM_HAVE_VGA)
- movb $0x12, %ah # Check EGA/VGA
- movb $0x10, %bl
- int $0x10
- movw %bx, %fs:(PARAM_VIDEO_EGA_BX) # Identifies EGA to the kernel
- cmpb $0x10, %bl # No, it's a CGA/MDA/HGA card.
- je basret
-
- incb adapter
- movw $0x1a00, %ax # Check EGA or VGA?
- int $0x10
- cmpb $0x1a, %al # 1a means VGA...
- jne basret # anything else is EGA.
-
- incb %fs:(PARAM_HAVE_VGA) # We've detected a VGA
- incb adapter
-basret: ret
-
-# Store the video mode parameters for later usage by the kernel.
-# This is done by asking the BIOS except for the rows/columns
-# parameters in the default 80x25 mode -- these are set directly,
-# because some very obscure BIOSes supply insane values.
-mode_params:
-#ifdef CONFIG_VIDEO_SELECT
- cmpb $0, graphic_mode
- jnz mopar_gr
-#endif
- movb $0x03, %ah # Read cursor position
- xorb %bh, %bh
- int $0x10
- movw %dx, %fs:(PARAM_CURSOR_POS)
- movb $0x0f, %ah # Read page/mode/width
- int $0x10
- movw %bx, %fs:(PARAM_VIDEO_PAGE)
- movw %ax, %fs:(PARAM_VIDEO_MODE) # Video mode and screen width
- cmpb $0x7, %al # MDA/HGA => segment differs
- jnz mopar0
-
- movw $0xb000, video_segment
-mopar0: movw %gs:(0x485), %ax # Font size
- movw %ax, %fs:(PARAM_FONT_POINTS) # (valid only on EGA/VGA)
- movw force_size, %ax # Forced size?
- orw %ax, %ax
- jz mopar1
-
- movb %ah, %fs:(PARAM_VIDEO_COLS)
- movb %al, %fs:(PARAM_VIDEO_LINES)
- ret
-
-mopar1: movb $25, %al
- cmpb $0, adapter # If we are on CGA/MDA/HGA, the
- jz mopar2 # screen must have 25 lines.
-
- movb %gs:(0x484), %al # On EGA/VGA, use the EGA+ BIOS
- incb %al # location of max lines.
-mopar2: movb %al, %fs:(PARAM_VIDEO_LINES)
- ret
-
-#ifdef CONFIG_VIDEO_SELECT
-# Fetching of VESA frame buffer parameters
-mopar_gr:
- leaw modelist+1024, %di
- movb $0x23, %fs:(PARAM_HAVE_VGA)
- movw 16(%di), %ax
- movw %ax, %fs:(PARAM_LFB_LINELENGTH)
- movw 18(%di), %ax
- movw %ax, %fs:(PARAM_LFB_WIDTH)
- movw 20(%di), %ax
- movw %ax, %fs:(PARAM_LFB_HEIGHT)
- movb 25(%di), %al
- movb $0, %ah
- movw %ax, %fs:(PARAM_LFB_DEPTH)
- movb 29(%di), %al
- movb $0, %ah
- movw %ax, %fs:(PARAM_LFB_PAGES)
- movl 40(%di), %eax
- movl %eax, %fs:(PARAM_LFB_BASE)
- movl 31(%di), %eax
- movl %eax, %fs:(PARAM_LFB_COLORS)
- movl 35(%di), %eax
- movl %eax, %fs:(PARAM_LFB_COLORS+4)
- movw 0(%di), %ax
- movw %ax, %fs:(PARAM_VESA_ATTRIB)
-
-# get video mem size
- leaw modelist+1024, %di
- movw $0x4f00, %ax
- int $0x10
- xorl %eax, %eax
- movw 18(%di), %ax
- movl %eax, %fs:(PARAM_LFB_SIZE)
-
-# store mode capabilities
- movl 10(%di), %eax
- movl %eax, %fs:(PARAM_CAPABILITIES)
-
-# switching the DAC to 8-bit is for <= 8 bpp only
- movw %fs:(PARAM_LFB_DEPTH), %ax
- cmpw $8, %ax
- jg dac_done
-
-# get DAC switching capability
- xorl %eax, %eax
- movb 10(%di), %al
- testb $1, %al
- jz dac_set
-
-# attempt to switch DAC to 8-bit
- movw $0x4f08, %ax
- movw $0x0800, %bx
- int $0x10
- cmpw $0x004f, %ax
- jne dac_set
- movb %bh, dac_size # store actual DAC size
-
-dac_set:
-# set color size to DAC size
- movb dac_size, %al
- movb %al, %fs:(PARAM_LFB_COLORS+0)
- movb %al, %fs:(PARAM_LFB_COLORS+2)
- movb %al, %fs:(PARAM_LFB_COLORS+4)
- movb %al, %fs:(PARAM_LFB_COLORS+6)
-
-# set color offsets to 0
- movb $0, %fs:(PARAM_LFB_COLORS+1)
- movb $0, %fs:(PARAM_LFB_COLORS+3)
- movb $0, %fs:(PARAM_LFB_COLORS+5)
- movb $0, %fs:(PARAM_LFB_COLORS+7)
-
-dac_done:
-# get protected mode interface informations
- movw $0x4f0a, %ax
- xorw %bx, %bx
- xorw %di, %di
- int $0x10
- cmp $0x004f, %ax
- jnz no_pm
-
- movw %es, %fs:(PARAM_VESAPM_SEG)
- movw %di, %fs:(PARAM_VESAPM_OFF)
-no_pm: ret
-
-# The video mode menu
-mode_menu:
- leaw keymsg, %si # "Return/Space/Timeout" message
- call prtstr
- call flush
-nokey: call getkt
-
- cmpb $0x0d, %al # ENTER ?
- je listm # yes - manual mode selection
-
- cmpb $0x20, %al # SPACE ?
- je defmd1 # no - repeat
-
- call beep
- jmp nokey
-
-defmd1: ret # No mode chosen? Default 80x25
-
-listm: call mode_table # List mode table
-listm0: leaw name_bann, %si # Print adapter name
- call prtstr
- movw card_name, %si
- orw %si, %si
- jnz an2
-
- movb adapter, %al
- leaw old_name, %si
- orb %al, %al
- jz an1
-
- leaw ega_name, %si
- decb %al
- jz an1
-
- leaw vga_name, %si
- jmp an1
-
-an2: call prtstr
- leaw svga_name, %si
-an1: call prtstr
- leaw listhdr, %si # Table header
- call prtstr
- movb $0x30, %dl # DL holds mode number
- leaw modelist, %si
-lm1: cmpw $ASK_VGA, (%si) # End?
- jz lm2
-
- movb %dl, %al # Menu selection number
- call prtchr
- call prtsp2
- lodsw
- call prthw # Mode ID
- call prtsp2
- movb 0x1(%si), %al
- call prtdec # Rows
- movb $0x78, %al # the letter 'x'
- call prtchr
- lodsw
- call prtdec # Columns
- movb $0x0d, %al # New line
- call prtchr
- movb $0x0a, %al
- call prtchr
- incb %dl # Next character
- cmpb $0x3a, %dl
- jnz lm1
-
- movb $0x61, %dl
- jmp lm1
-
-lm2: leaw prompt, %si # Mode prompt
- call prtstr
- leaw edit_buf, %di # Editor buffer
-lm3: call getkey
- cmpb $0x0d, %al # Enter?
- jz lment
-
- cmpb $0x08, %al # Backspace?
- jz lmbs
-
- cmpb $0x20, %al # Printable?
- jc lm3
-
- cmpw $edit_buf+4, %di # Enough space?
- jz lm3
-
- stosb
- call prtchr
- jmp lm3
-
-lmbs: cmpw $edit_buf, %di # Backspace
- jz lm3
-
- decw %di
- movb $0x08, %al
- call prtchr
- call prtspc
- movb $0x08, %al
- call prtchr
- jmp lm3
-
-lment: movb $0, (%di)
- leaw crlft, %si
- call prtstr
- leaw edit_buf, %si
- cmpb $0, (%si) # Empty string = default mode
- jz lmdef
-
- cmpb $0, 1(%si) # One character = menu selection
- jz mnusel
-
- cmpw $0x6373, (%si) # "scan" => mode scanning
- jnz lmhx
-
- cmpw $0x6e61, 2(%si)
- jz lmscan
-
-lmhx: xorw %bx, %bx # Else => mode ID in hex
-lmhex: lodsb
- orb %al, %al
- jz lmuse1
-
- subb $0x30, %al
- jc lmbad
-
- cmpb $10, %al
- jc lmhx1
-
- subb $7, %al
- andb $0xdf, %al
- cmpb $10, %al
- jc lmbad
-
- cmpb $16, %al
- jnc lmbad
-
-lmhx1: shlw $4, %bx
- orb %al, %bl
- jmp lmhex
-
-lmuse1: movw %bx, %ax
- jmp lmuse
-
-mnusel: lodsb # Menu selection
- xorb %ah, %ah
- subb $0x30, %al
- jc lmbad
-
- cmpb $10, %al
- jc lmuse
-
- cmpb $0x61-0x30, %al
- jc lmbad
-
- subb $0x61-0x30-10, %al
- cmpb $36, %al
- jnc lmbad
-
-lmuse: call mode_set
- jc lmdef
-
-lmbad: leaw unknt, %si
- call prtstr
- jmp lm2
-lmscan: cmpb $0, adapter # Scanning only on EGA/VGA
- jz lmbad
-
- movw $0, mt_end # Scanning of modes is
- movb $1, scanning # done as new autodetection.
- call mode_table
- jmp listm0
-lmdef: ret
-
-# Additional parts of mode_set... (relative jumps, you know)
-setv7: # Video7 extended modes
- DO_STORE
- subb $VIDEO_FIRST_V7>>8, %bh
- movw $0x6f05, %ax
- int $0x10
- stc
- ret
-
-_setrec: jmp setrec # Ugly...
-_set_80x25: jmp set_80x25
-
-# Aliases for backward compatibility.
-setalias:
- movw $VIDEO_80x25, %ax
- incw %bx
- jz mode_set
-
- movb $VIDEO_8POINT-VIDEO_FIRST_SPECIAL, %al
- incw %bx
- jnz setbad # Fall-through!
-
-# Setting of user mode (AX=mode ID) => CF=success
-mode_set:
- movw %ax, %fs:(0x01fa) # Store mode for use in acpi_wakeup.S
- movw %ax, %bx
- cmpb $0xff, %ah
- jz setalias
-
- testb $VIDEO_RECALC>>8, %ah
- jnz _setrec
-
- cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
- jnc setres
-
- cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
- jz setspc
-
- cmpb $VIDEO_FIRST_V7>>8, %ah
- jz setv7
-
- cmpb $VIDEO_FIRST_VESA>>8, %ah
- jnc check_vesa
-
- orb %ah, %ah
- jz setmenu
-
- decb %ah
- jz setbios
-
-setbad: clc
- movb $0, do_restore # The screen needn't be restored
- ret
-
-setvesa:
- DO_STORE
- subb $VIDEO_FIRST_VESA>>8, %bh
- movw $0x4f02, %ax # VESA BIOS mode set call
- int $0x10
- cmpw $0x004f, %ax # AL=4f if implemented
- jnz setbad # AH=0 if OK
-
- stc
- ret
-
-setbios:
- DO_STORE
- int $0x10 # Standard BIOS mode set call
- pushw %bx
- movb $0x0f, %ah # Check if really set
- int $0x10
- popw %bx
- cmpb %bl, %al
- jnz setbad
-
- stc
- ret
-
-setspc: xorb %bh, %bh # Set special mode
- cmpb $VIDEO_LAST_SPECIAL-VIDEO_FIRST_SPECIAL, %bl
- jnc setbad
-
- addw %bx, %bx
- jmp *spec_inits(%bx)
-
-setmenu:
- orb %al, %al # 80x25 is an exception
- jz _set_80x25
-
- pushw %bx # Set mode chosen from menu
- call mode_table # Build the mode table
- popw %ax
- shlw $2, %ax
- addw %ax, %si
- cmpw %di, %si
- jnc setbad
-
- movw (%si), %ax # Fetch mode ID
-_m_s: jmp mode_set
-
-setres: pushw %bx # Set mode chosen by resolution
- call mode_table
- popw %bx
- xchgb %bl, %bh
-setr1: lodsw
- cmpw $ASK_VGA, %ax # End of the list?
- jz setbad
-
- lodsw
- cmpw %bx, %ax
- jnz setr1
-
- movw -4(%si), %ax # Fetch mode ID
- jmp _m_s
-
-check_vesa:
-#ifdef CONFIG_FIRMWARE_EDID
- leaw modelist+1024, %di
- movw $0x4f00, %ax
- int $0x10
- cmpw $0x004f, %ax
- jnz setbad
-
- movw 4(%di), %ax
- movw %ax, vbe_version
-#endif
- leaw modelist+1024, %di
- subb $VIDEO_FIRST_VESA>>8, %bh
- movw %bx, %cx # Get mode information structure
- movw $0x4f01, %ax
- int $0x10
- addb $VIDEO_FIRST_VESA>>8, %bh
- cmpw $0x004f, %ax
- jnz setbad
-
- movb (%di), %al # Check capabilities.
- andb $0x19, %al
- cmpb $0x09, %al
- jz setvesa # This is a text mode
-
- movb (%di), %al # Check capabilities.
- andb $0x99, %al
- cmpb $0x99, %al
- jnz _setbad # Doh! No linear frame buffer.
-
- subb $VIDEO_FIRST_VESA>>8, %bh
- orw $0x4000, %bx # Use linear frame buffer
- movw $0x4f02, %ax # VESA BIOS mode set call
- int $0x10
- cmpw $0x004f, %ax # AL=4f if implemented
- jnz _setbad # AH=0 if OK
-
- movb $1, graphic_mode # flag graphic mode
- movb $0, do_restore # no screen restore
- stc
- ret
-
-_setbad: jmp setbad # Ugly...
-
-# Recalculate vertical display end registers -- this fixes various
-# inconsistencies of extended modes on many adapters. Called when
-# the VIDEO_RECALC flag is set in the mode ID.
-
-setrec: subb $VIDEO_RECALC>>8, %ah # Set the base mode
- call mode_set
- jnc rct3
-
- movw %gs:(0x485), %ax # Font size in pixels
- movb %gs:(0x484), %bl # Number of rows
- incb %bl
- mulb %bl # Number of visible
- decw %ax # scan lines - 1
- movw $0x3d4, %dx
- movw %ax, %bx
- movb $0x12, %al # Lower 8 bits
- movb %bl, %ah
- outw %ax, %dx
- movb $0x07, %al # Bits 8 and 9 in the overflow register
- call inidx
- xchgb %al, %ah
- andb $0xbd, %ah
- shrb %bh
- jnc rct1
- orb $0x02, %ah
-rct1: shrb %bh
- jnc rct2
- orb $0x40, %ah
-rct2: movb $0x07, %al
- outw %ax, %dx
- stc
-rct3: ret
-
-# Table of routines for setting of the special modes.
-spec_inits:
- .word set_80x25
- .word set_8pixel
- .word set_80x43
- .word set_80x28
- .word set_current
- .word set_80x30
- .word set_80x34
- .word set_80x60
- .word set_gfx
-
-# Set the 80x25 mode. If already set, do nothing.
-set_80x25:
- movw $0x5019, force_size # Override possibly broken BIOS
-use_80x25:
-#ifdef CONFIG_VIDEO_400_HACK
- movw $0x1202, %ax # Force 400 scan lines
- movb $0x30, %bl
- int $0x10
-#else
- movb $0x0f, %ah # Get current mode ID
- int $0x10
- cmpw $0x5007, %ax # Mode 7 (80x25 mono) is the only one available
- jz st80 # on CGA/MDA/HGA and is also available on EGAM
-
- cmpw $0x5003, %ax # Unknown mode, force 80x25 color
- jnz force3
-
-st80: cmpb $0, adapter # CGA/MDA/HGA => mode 3/7 is always 80x25
- jz set80
-
- movb %gs:(0x0484), %al # This is EGA+ -- beware of 80x50 etc.
- orb %al, %al # Some buggy BIOS'es set 0 rows
- jz set80
-
- cmpb $24, %al # It's hopefully correct
- jz set80
-#endif /* CONFIG_VIDEO_400_HACK */
-force3: DO_STORE
- movw $0x0003, %ax # Forced set
- int $0x10
-set80: stc
- ret
-
-# Set the 80x50/80x43 8-pixel mode. Simple BIOS calls.
-set_8pixel:
- DO_STORE
- call use_80x25 # The base is 80x25
-set_8pt:
- movw $0x1112, %ax # Use 8x8 font
- xorb %bl, %bl
- int $0x10
- movw $0x1200, %ax # Use alternate print screen
- movb $0x20, %bl
- int $0x10
- movw $0x1201, %ax # Turn off cursor emulation
- movb $0x34, %bl
- int $0x10
- movb $0x01, %ah # Define cursor scan lines 6-7
- movw $0x0607, %cx
- int $0x10
-set_current:
- stc
- ret
-
-# Set the 80x28 mode. This mode works on all VGA's, because it's a standard
-# 80x25 mode with 14-point fonts instead of 16-point.
-set_80x28:
- DO_STORE
- call use_80x25 # The base is 80x25
-set14: movw $0x1111, %ax # Use 9x14 font
- xorb %bl, %bl
- int $0x10
- movb $0x01, %ah # Define cursor scan lines 11-12
- movw $0x0b0c, %cx
- int $0x10
- stc
- ret
-
-# Set the 80x43 mode. This mode is works on all VGA's.
-# It's a 350-scanline mode with 8-pixel font.
-set_80x43:
- DO_STORE
- movw $0x1201, %ax # Set 350 scans
- movb $0x30, %bl
- int $0x10
- movw $0x0003, %ax # Reset video mode
- int $0x10
- jmp set_8pt # Use 8-pixel font
-
-# Set the 80x30 mode (all VGA's). 480 scanlines, 16-pixel font.
-set_80x30:
- call use_80x25 # Start with real 80x25
- DO_STORE
- movw $0x3cc, %dx # Get CRTC port
- inb %dx, %al
- movb $0xd4, %dl
- rorb %al # Mono or color?
- jc set48a
-
- movb $0xb4, %dl
-set48a: movw $0x0c11, %ax # Vertical sync end (also unlocks CR0-7)
- call outidx
- movw $0x0b06, %ax # Vertical total
- call outidx
- movw $0x3e07, %ax # (Vertical) overflow
- call outidx
- movw $0xea10, %ax # Vertical sync start
- call outidx
- movw $0xdf12, %ax # Vertical display end
- call outidx
- movw $0xe715, %ax # Vertical blank start
- call outidx
- movw $0x0416, %ax # Vertical blank end
- call outidx
- pushw %dx
- movb $0xcc, %dl # Misc output register (read)
- inb %dx, %al
- movb $0xc2, %dl # (write)
- andb $0x0d, %al # Preserve clock select bits and color bit
- orb $0xe2, %al # Set correct sync polarity
- outb %al, %dx
- popw %dx
- movw $0x501e, force_size
- stc # That's all.
- ret
-
-# Set the 80x34 mode (all VGA's). 480 scans, 14-pixel font.
-set_80x34:
- call set_80x30 # Set 480 scans
- call set14 # And 14-pt font
- movw $0xdb12, %ax # VGA vertical display end
- movw $0x5022, force_size
-setvde: call outidx
- stc
- ret
-
-# Set the 80x60 mode (all VGA's). 480 scans, 8-pixel font.
-set_80x60:
- call set_80x30 # Set 480 scans
- call set_8pt # And 8-pt font
- movw $0xdf12, %ax # VGA vertical display end
- movw $0x503c, force_size
- jmp setvde
-
-# Special hack for ThinkPad graphics
-set_gfx:
-#ifdef CONFIG_VIDEO_GFX_HACK
- movw $VIDEO_GFX_BIOS_AX, %ax
- movw $VIDEO_GFX_BIOS_BX, %bx
- int $0x10
- movw $VIDEO_GFX_DUMMY_RESOLUTION, force_size
- stc
-#endif
- ret
-
-#ifdef CONFIG_VIDEO_RETAIN
-
-# Store screen contents to temporary buffer.
-store_screen:
- cmpb $0, do_restore # Already stored?
- jnz stsr
-
- testb $CAN_USE_HEAP, loadflags # Have we space for storing?
- jz stsr
-
- pushw %ax
- pushw %bx
- pushw force_size # Don't force specific size
- movw $0, force_size
- call mode_params # Obtain params of current mode
- popw force_size
- movb %fs:(PARAM_VIDEO_LINES), %ah
- movb %fs:(PARAM_VIDEO_COLS), %al
- movw %ax, %bx # BX=dimensions
- mulb %ah
- movw %ax, %cx # CX=number of characters
- addw %ax, %ax # Calculate image size
- addw $modelist+1024+4, %ax
- cmpw heap_end_ptr, %ax
- jnc sts1 # Unfortunately, out of memory
-
- movw %fs:(PARAM_CURSOR_POS), %ax # Store mode params
- leaw modelist+1024, %di
- stosw
- movw %bx, %ax
- stosw
- pushw %ds # Store the screen
- movw video_segment, %ds
- xorw %si, %si
- rep
- movsw
- popw %ds
- incb do_restore # Screen will be restored later
-sts1: popw %bx
- popw %ax
-stsr: ret
-
-# Restore screen contents from temporary buffer.
-restore_screen:
- cmpb $0, do_restore # Has the screen been stored?
- jz res1
-
- call mode_params # Get parameters of current mode
- movb %fs:(PARAM_VIDEO_LINES), %cl
- movb %fs:(PARAM_VIDEO_COLS), %ch
- leaw modelist+1024, %si # Screen buffer
- lodsw # Set cursor position
- movw %ax, %dx
- cmpb %cl, %dh
- jc res2
-
- movb %cl, %dh
- decb %dh
-res2: cmpb %ch, %dl
- jc res3
-
- movb %ch, %dl
- decb %dl
-res3: movb $0x02, %ah
- movb $0x00, %bh
- int $0x10
- lodsw # Display size
- movb %ah, %dl # DL=number of lines
- movb $0, %ah # BX=phys. length of orig. line
- movw %ax, %bx
- cmpb %cl, %dl # Too many?
- jc res4
-
- pushw %ax
- movb %dl, %al
- subb %cl, %al
- mulb %bl
- addw %ax, %si
- addw %ax, %si
- popw %ax
- movb %cl, %dl
-res4: cmpb %ch, %al # Too wide?
- jc res5
-
- movb %ch, %al # AX=width of src. line
-res5: movb $0, %cl
- xchgb %ch, %cl
- movw %cx, %bp # BP=width of dest. line
- pushw %es
- movw video_segment, %es
- xorw %di, %di # Move the data
- addw %bx, %bx # Convert BX and BP to _bytes_
- addw %bp, %bp
-res6: pushw %si
- pushw %di
- movw %ax, %cx
- rep
- movsw
- popw %di
- popw %si
- addw %bp, %di
- addw %bx, %si
- decb %dl
- jnz res6
-
- popw %es # Done
-res1: ret
-#endif /* CONFIG_VIDEO_RETAIN */
-
-# Write to indexed VGA register (AL=index, AH=data, DX=index reg. port)
-outidx: outb %al, %dx
- pushw %ax
- movb %ah, %al
- incw %dx
- outb %al, %dx
- decw %dx
- popw %ax
- ret
-
-# Build the table of video modes (stored after the setup.S code at the
-# `modelist' label. Each video mode record looks like:
-# .word MODE-ID (our special mode ID (see above))
-# .byte rows (number of rows)
-# .byte columns (number of columns)
-# Returns address of the end of the table in DI, the end is marked
-# with a ASK_VGA ID.
-mode_table:
- movw mt_end, %di # Already filled?
- orw %di, %di
- jnz mtab1x
-
- leaw modelist, %di # Store standard modes:
- movl $VIDEO_80x25 + 0x50190000, %eax # The 80x25 mode (ALL)
- stosl
- movb adapter, %al # CGA/MDA/HGA -- no more modes
- orb %al, %al
- jz mtabe
-
- decb %al
- jnz mtabv
-
- movl $VIDEO_8POINT + 0x502b0000, %eax # The 80x43 EGA mode
- stosl
- jmp mtabe
-
-mtab1x: jmp mtab1
-
-mtabv: leaw vga_modes, %si # All modes for std VGA
- movw $vga_modes_end-vga_modes, %cx
- rep # I'm unable to use movsw as I don't know how to store a half
- movsb # of the expression above to cx without using explicit shr.
-
- cmpb $0, scanning # Mode scan requested?
- jz mscan1
-
- call mode_scan
-mscan1:
-
-#ifdef CONFIG_VIDEO_LOCAL
- call local_modes
-#endif /* CONFIG_VIDEO_LOCAL */
-
-#ifdef CONFIG_VIDEO_VESA
- call vesa_modes # Detect VESA VGA modes
-#endif /* CONFIG_VIDEO_VESA */
-
-#ifdef CONFIG_VIDEO_SVGA
- cmpb $0, scanning # Bypass when scanning
- jnz mscan2
-
- call svga_modes # Detect SVGA cards & modes
-mscan2:
-#endif /* CONFIG_VIDEO_SVGA */
-
-mtabe:
-
-#ifdef CONFIG_VIDEO_COMPACT
- leaw modelist, %si
- movw %di, %dx
- movw %si, %di
-cmt1: cmpw %dx, %si # Scan all modes
- jz cmt2
-
- leaw modelist, %bx # Find in previous entries
- movw 2(%si), %cx
-cmt3: cmpw %bx, %si
- jz cmt4
-
- cmpw 2(%bx), %cx # Found => don't copy this entry
- jz cmt5
-
- addw $4, %bx
- jmp cmt3
-
-cmt4: movsl # Copy entry
- jmp cmt1
-
-cmt5: addw $4, %si # Skip entry
- jmp cmt1
-
-cmt2:
-#endif /* CONFIG_VIDEO_COMPACT */
-
- movw $ASK_VGA, (%di) # End marker
- movw %di, mt_end
-mtab1: leaw modelist, %si # SI=mode list, DI=list end
-ret0: ret
-
-# Modes usable on all standard VGAs
-vga_modes:
- .word VIDEO_8POINT
- .word 0x5032 # 80x50
- .word VIDEO_80x43
- .word 0x502b # 80x43
- .word VIDEO_80x28
- .word 0x501c # 80x28
- .word VIDEO_80x30
- .word 0x501e # 80x30
- .word VIDEO_80x34
- .word 0x5022 # 80x34
- .word VIDEO_80x60
- .word 0x503c # 80x60
-#ifdef CONFIG_VIDEO_GFX_HACK
- .word VIDEO_GFX_HACK
- .word VIDEO_GFX_DUMMY_RESOLUTION
-#endif
-
-vga_modes_end:
-# Detect VESA modes.
-
-#ifdef CONFIG_VIDEO_VESA
-vesa_modes:
- cmpb $2, adapter # VGA only
- jnz ret0
-
- movw %di, %bp # BP=original mode table end
- addw $0x200, %di # Buffer space
- movw $0x4f00, %ax # VESA Get card info call
- int $0x10
- movw %bp, %di
- cmpw $0x004f, %ax # Successful?
- jnz ret0
-
- cmpw $0x4556, 0x200(%di)
- jnz ret0
-
- cmpw $0x4153, 0x202(%di)
- jnz ret0
-
- movw $vesa_name, card_name # Set name to "VESA VGA"
- pushw %gs
- lgsw 0x20e(%di), %si # GS:SI=mode list
- movw $128, %cx # Iteration limit
-vesa1:
-# gas version 2.9.1, using BFD version 2.9.1.0.23 buggers the next inst.
-# XXX: lodsw %gs:(%si), %ax # Get next mode in the list
- gs; lodsw
- cmpw $0xffff, %ax # End of the table?
- jz vesar
-
- cmpw $0x0080, %ax # Check validity of mode ID
- jc vesa2
-
- orb %ah, %ah # Valid IDs: 0x0000-0x007f/0x0100-0x07ff
- jz vesan # Certain BIOSes report 0x80-0xff!
-
- cmpw $0x0800, %ax
- jnc vesae
-
-vesa2: pushw %cx
- movw %ax, %cx # Get mode information structure
- movw $0x4f01, %ax
- int $0x10
- movw %cx, %bx # BX=mode number
- addb $VIDEO_FIRST_VESA>>8, %bh
- popw %cx
- cmpw $0x004f, %ax
- jnz vesan # Don't report errors (buggy BIOSES)
-
- movb (%di), %al # Check capabilities. We require
- andb $0x19, %al # a color text mode.
- cmpb $0x09, %al
- jnz vesan
-
- cmpw $0xb800, 8(%di) # Standard video memory address required
- jnz vesan
-
- testb $2, (%di) # Mode characteristics supplied?
- movw %bx, (%di) # Store mode number
- jz vesa3
-
- xorw %dx, %dx
- movw 0x12(%di), %bx # Width
- orb %bh, %bh
- jnz vesan
-
- movb %bl, 0x3(%di)
- movw 0x14(%di), %ax # Height
- orb %ah, %ah
- jnz vesan
-
- movb %al, 2(%di)
- mulb %bl
- cmpw $8193, %ax # Small enough for Linux console driver?
- jnc vesan
-
- jmp vesaok
-
-vesa3: subw $0x8108, %bx # This mode has no detailed info specified,
- jc vesan # so it must be a standard VESA mode.
-
- cmpw $5, %bx
- jnc vesan
-
- movw vesa_text_mode_table(%bx), %ax
- movw %ax, 2(%di)
-vesaok: addw $4, %di # The mode is valid. Store it.
-vesan: loop vesa1 # Next mode. Limit exceeded => error
-vesae: leaw vesaer, %si
- call prtstr
- movw %bp, %di # Discard already found modes.
-vesar: popw %gs
- ret
-
-# Dimensions of standard VESA text modes
-vesa_text_mode_table:
- .byte 60, 80 # 0108
- .byte 25, 132 # 0109
- .byte 43, 132 # 010A
- .byte 50, 132 # 010B
- .byte 60, 132 # 010C
-#endif /* CONFIG_VIDEO_VESA */
-
-# Scan for video modes. A bit dirty, but should work.
-mode_scan:
- movw $0x0100, %cx # Start with mode 0
-scm1: movb $0, %ah # Test the mode
- movb %cl, %al
- int $0x10
- movb $0x0f, %ah
- int $0x10
- cmpb %cl, %al
- jnz scm2 # Mode not set
-
- movw $0x3c0, %dx # Test if it's a text mode
- movb $0x10, %al # Mode bits
- call inidx
- andb $0x03, %al
- jnz scm2
-
- movb $0xce, %dl # Another set of mode bits
- movb $0x06, %al
- call inidx
- shrb %al
- jc scm2
-
- movb $0xd4, %dl # Cursor location
- movb $0x0f, %al
- call inidx
- orb %al, %al
- jnz scm2
-
- movw %cx, %ax # Ok, store the mode
- stosw
- movb %gs:(0x484), %al # Number of rows
- incb %al
- stosb
- movw %gs:(0x44a), %ax # Number of columns
- stosb
-scm2: incb %cl
- jns scm1
-
- movw $0x0003, %ax # Return back to mode 3
- int $0x10
- ret
-
-tstidx: outw %ax, %dx # OUT DX,AX and inidx
-inidx: outb %al, %dx # Read from indexed VGA register
- incw %dx # AL=index, DX=index reg port -> AL=data
- inb %dx, %al
- decw %dx
- ret
-
-# Try to detect type of SVGA card and supply (usually approximate) video
-# mode table for it.
-
-#ifdef CONFIG_VIDEO_SVGA
-svga_modes:
- leaw svga_table, %si # Test all known SVGA adapters
-dosvga: lodsw
- movw %ax, %bp # Default mode table
- orw %ax, %ax
- jz didsv1
-
- lodsw # Pointer to test routine
- pushw %si
- pushw %di
- pushw %es
- movw $0xc000, %bx
- movw %bx, %es
- call *%ax # Call test routine
- popw %es
- popw %di
- popw %si
- orw %bp, %bp
- jz dosvga
-
- movw %bp, %si # Found, copy the modes
- movb svga_prefix, %ah
-cpsvga: lodsb
- orb %al, %al
- jz didsv
-
- stosw
- movsw
- jmp cpsvga
-
-didsv: movw %si, card_name # Store pointer to card name
-didsv1: ret
-
-# Table of all known SVGA cards. For each card, we store a pointer to
-# a table of video modes supported by the card and a pointer to a routine
-# used for testing of presence of the card. The video mode table is always
-# followed by the name of the card or the chipset.
-svga_table:
- .word ati_md, ati_test
- .word oak_md, oak_test
- .word paradise_md, paradise_test
- .word realtek_md, realtek_test
- .word s3_md, s3_test
- .word chips_md, chips_test
- .word video7_md, video7_test
- .word cirrus5_md, cirrus5_test
- .word cirrus6_md, cirrus6_test
- .word cirrus1_md, cirrus1_test
- .word ahead_md, ahead_test
- .word everex_md, everex_test
- .word genoa_md, genoa_test
- .word trident_md, trident_test
- .word tseng_md, tseng_test
- .word 0
-
-# Test routines and mode tables:
-
-# S3 - The test algorithm was taken from the SuperProbe package
-# for XFree86 1.2.1. Report bugs to Christoph.Niemann@linux.org
-s3_test:
- movw $0x0f35, %cx # we store some constants in cl/ch
- movw $0x03d4, %dx
- movb $0x38, %al
- call inidx
- movb %al, %bh # store current CRT-register 0x38
- movw $0x0038, %ax
- call outidx # disable writing to special regs
- movb %cl, %al # check whether we can write special reg 0x35
- call inidx
- movb %al, %bl # save the current value of CRT reg 0x35
- andb $0xf0, %al # clear bits 0-3
- movb %al, %ah
- movb %cl, %al # and write it to CRT reg 0x35
- call outidx
- call inidx # now read it back
- andb %ch, %al # clear the upper 4 bits
- jz s3_2 # the first test failed. But we have a
-
- movb %bl, %ah # second chance
- movb %cl, %al
- call outidx
- jmp s3_1 # do the other tests
-
-s3_2: movw %cx, %ax # load ah with 0xf and al with 0x35
- orb %bl, %ah # set the upper 4 bits of ah with the orig value
- call outidx # write ...
- call inidx # ... and reread
- andb %cl, %al # turn off the upper 4 bits
- pushw %ax
- movb %bl, %ah # restore old value in register 0x35
- movb %cl, %al
- call outidx
- popw %ax
- cmpb %ch, %al # setting lower 4 bits was successful => bad
- je no_s3 # writing is allowed => this is not an S3
-
-s3_1: movw $0x4838, %ax # allow writing to special regs by putting
- call outidx # magic number into CRT-register 0x38
- movb %cl, %al # check whether we can write special reg 0x35
- call inidx
- movb %al, %bl
- andb $0xf0, %al
- movb %al, %ah
- movb %cl, %al
- call outidx
- call inidx
- andb %ch, %al
- jnz no_s3 # no, we can't write => no S3
-
- movw %cx, %ax
- orb %bl, %ah
- call outidx
- call inidx
- andb %ch, %al
- pushw %ax
- movb %bl, %ah # restore old value in register 0x35
- movb %cl, %al
- call outidx
- popw %ax
- cmpb %ch, %al
- jne no_s31 # writing not possible => no S3
- movb $0x30, %al
- call inidx # now get the S3 id ...
- leaw idS3, %di
- movw $0x10, %cx
- repne
- scasb
- je no_s31
-
- movb %bh, %ah
- movb $0x38, %al
- jmp s3rest
-
-no_s3: movb $0x35, %al # restore CRT register 0x35
- movb %bl, %ah
- call outidx
-no_s31: xorw %bp, %bp # Detection failed
-s3rest: movb %bh, %ah
- movb $0x38, %al # restore old value of CRT register 0x38
- jmp outidx
-
-idS3: .byte 0x81, 0x82, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95
- .byte 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa8, 0xb0
-
-s3_md: .byte 0x54, 0x2b, 0x84
- .byte 0x55, 0x19, 0x84
- .byte 0
- .ascii "S3"
- .byte 0
-
-# ATI cards.
-ati_test:
- leaw idati, %si
- movw $0x31, %di
- movw $0x09, %cx
- repe
- cmpsb
- je atiok
-
- xorw %bp, %bp
-atiok: ret
-
-idati: .ascii "761295520"
-
-ati_md: .byte 0x23, 0x19, 0x84
- .byte 0x33, 0x2c, 0x84
- .byte 0x22, 0x1e, 0x64
- .byte 0x21, 0x19, 0x64
- .byte 0x58, 0x21, 0x50
- .byte 0x5b, 0x1e, 0x50
- .byte 0
- .ascii "ATI"
- .byte 0
-
-# AHEAD
-ahead_test:
- movw $0x200f, %ax
- movw $0x3ce, %dx
- outw %ax, %dx
- incw %dx
- inb %dx, %al
- cmpb $0x20, %al
- je isahed
-
- cmpb $0x21, %al
- je isahed
-
- xorw %bp, %bp
-isahed: ret
-
-ahead_md:
- .byte 0x22, 0x2c, 0x84
- .byte 0x23, 0x19, 0x84
- .byte 0x24, 0x1c, 0x84
- .byte 0x2f, 0x32, 0xa0
- .byte 0x32, 0x22, 0x50
- .byte 0x34, 0x42, 0x50
- .byte 0
- .ascii "Ahead"
- .byte 0
-
-# Chips & Tech.
-chips_test:
- movw $0x3c3, %dx
- inb %dx, %al
- orb $0x10, %al
- outb %al, %dx
- movw $0x104, %dx
- inb %dx, %al
- movb %al, %bl
- movw $0x3c3, %dx
- inb %dx, %al
- andb $0xef, %al
- outb %al, %dx
- cmpb $0xa5, %bl
- je cantok
-
- xorw %bp, %bp
-cantok: ret
-
-chips_md:
- .byte 0x60, 0x19, 0x84
- .byte 0x61, 0x32, 0x84
- .byte 0
- .ascii "Chips & Technologies"
- .byte 0
-
-# Cirrus Logic 5X0
-cirrus1_test:
- movw $0x3d4, %dx
- movb $0x0c, %al
- outb %al, %dx
- incw %dx
- inb %dx, %al
- movb %al, %bl
- xorb %al, %al
- outb %al, %dx
- decw %dx
- movb $0x1f, %al
- outb %al, %dx
- incw %dx
- inb %dx, %al
- movb %al, %bh
- xorb %ah, %ah
- shlb $4, %al
- movw %ax, %cx
- movb %bh, %al
- shrb $4, %al
- addw %ax, %cx
- shlw $8, %cx
- addw $6, %cx
- movw %cx, %ax
- movw $0x3c4, %dx
- outw %ax, %dx
- incw %dx
- inb %dx, %al
- andb %al, %al
- jnz nocirr
-
- movb %bh, %al
- outb %al, %dx
- inb %dx, %al
- cmpb $0x01, %al
- je iscirr
-
-nocirr: xorw %bp, %bp
-iscirr: movw $0x3d4, %dx
- movb %bl, %al
- xorb %ah, %ah
- shlw $8, %ax
- addw $0x0c, %ax
- outw %ax, %dx
- ret
-
-cirrus1_md:
- .byte 0x1f, 0x19, 0x84
- .byte 0x20, 0x2c, 0x84
- .byte 0x22, 0x1e, 0x84
- .byte 0x31, 0x25, 0x64
- .byte 0
- .ascii "Cirrus Logic 5X0"
- .byte 0
-
-# Cirrus Logic 54XX
-cirrus5_test:
- movw $0x3c4, %dx
- movb $6, %al
- call inidx
- movb %al, %bl # BL=backup
- movw $6, %ax
- call tstidx
- cmpb $0x0f, %al
- jne c5fail
-
- movw $0x1206, %ax
- call tstidx
- cmpb $0x12, %al
- jne c5fail
-
- movb $0x1e, %al
- call inidx
- movb %al, %bh
- movb %bh, %ah
- andb $0xc0, %ah
- movb $0x1e, %al
- call tstidx
- andb $0x3f, %al
- jne c5xx
-
- movb $0x1e, %al
- movb %bh, %ah
- orb $0x3f, %ah
- call tstidx
- xorb $0x3f, %al
- andb $0x3f, %al
-c5xx: pushf
- movb $0x1e, %al
- movb %bh, %ah
- outw %ax, %dx
- popf
- je c5done
-
-c5fail: xorw %bp, %bp
-c5done: movb $6, %al
- movb %bl, %ah
- outw %ax, %dx
- ret
-
-cirrus5_md:
- .byte 0x14, 0x19, 0x84
- .byte 0x54, 0x2b, 0x84
- .byte 0
- .ascii "Cirrus Logic 54XX"
- .byte 0
-
-# Cirrus Logic 64XX -- no known extra modes, but must be identified, because
-# it's misidentified by the Ahead test.
-cirrus6_test:
- movw $0x3ce, %dx
- movb $0x0a, %al
- call inidx
- movb %al, %bl # BL=backup
- movw $0xce0a, %ax
- call tstidx
- orb %al, %al
- jne c2fail
-
- movw $0xec0a, %ax
- call tstidx
- cmpb $0x01, %al
- jne c2fail
-
- movb $0xaa, %al
- call inidx # 4X, 5X, 7X and 8X are valid 64XX chip ID's.
- shrb $4, %al
- subb $4, %al
- jz c6done
-
- decb %al
- jz c6done
-
- subb $2, %al
- jz c6done
-
- decb %al
- jz c6done
-
-c2fail: xorw %bp, %bp
-c6done: movb $0x0a, %al
- movb %bl, %ah
- outw %ax, %dx
- ret
-
-cirrus6_md:
- .byte 0
- .ascii "Cirrus Logic 64XX"
- .byte 0
-
-# Everex / Trident
-everex_test:
- movw $0x7000, %ax
- xorw %bx, %bx
- int $0x10
- cmpb $0x70, %al
- jne noevrx
-
- shrw $4, %dx
- cmpw $0x678, %dx
- je evtrid
-
- cmpw $0x236, %dx
- jne evrxok
-
-evtrid: leaw trident_md, %bp
-evrxok: ret
-
-noevrx: xorw %bp, %bp
- ret
-
-everex_md:
- .byte 0x03, 0x22, 0x50
- .byte 0x04, 0x3c, 0x50
- .byte 0x07, 0x2b, 0x64
- .byte 0x08, 0x4b, 0x64
- .byte 0x0a, 0x19, 0x84
- .byte 0x0b, 0x2c, 0x84
- .byte 0x16, 0x1e, 0x50
- .byte 0x18, 0x1b, 0x64
- .byte 0x21, 0x40, 0xa0
- .byte 0x40, 0x1e, 0x84
- .byte 0
- .ascii "Everex/Trident"
- .byte 0
-
-# Genoa.
-genoa_test:
- leaw idgenoa, %si # Check Genoa 'clues'
- xorw %ax, %ax
- movb %es:(0x37), %al
- movw %ax, %di
- movw $0x04, %cx
- decw %si
- decw %di
-l1: incw %si
- incw %di
- movb (%si), %al
- testb %al, %al
- jz l2
-
- cmpb %es:(%di), %al
-l2: loope l1
- orw %cx, %cx
- je isgen
-
- xorw %bp, %bp
-isgen: ret
-
-idgenoa: .byte 0x77, 0x00, 0x99, 0x66
-
-genoa_md:
- .byte 0x58, 0x20, 0x50
- .byte 0x5a, 0x2a, 0x64
- .byte 0x60, 0x19, 0x84
- .byte 0x61, 0x1d, 0x84
- .byte 0x62, 0x20, 0x84
- .byte 0x63, 0x2c, 0x84
- .byte 0x64, 0x3c, 0x84
- .byte 0x6b, 0x4f, 0x64
- .byte 0x72, 0x3c, 0x50
- .byte 0x74, 0x42, 0x50
- .byte 0x78, 0x4b, 0x64
- .byte 0
- .ascii "Genoa"
- .byte 0
-
-# OAK
-oak_test:
- leaw idoakvga, %si
- movw $0x08, %di
- movw $0x08, %cx
- repe
- cmpsb
- je isoak
-
- xorw %bp, %bp
-isoak: ret
-
-idoakvga: .ascii "OAK VGA "
-
-oak_md: .byte 0x4e, 0x3c, 0x50
- .byte 0x4f, 0x3c, 0x84
- .byte 0x50, 0x19, 0x84
- .byte 0x51, 0x2b, 0x84
- .byte 0
- .ascii "OAK"
- .byte 0
-
-# WD Paradise.
-paradise_test:
- leaw idparadise, %si
- movw $0x7d, %di
- movw $0x04, %cx
- repe
- cmpsb
- je ispara
-
- xorw %bp, %bp
-ispara: ret
-
-idparadise: .ascii "VGA="
-
-paradise_md:
- .byte 0x41, 0x22, 0x50
- .byte 0x47, 0x1c, 0x84
- .byte 0x55, 0x19, 0x84
- .byte 0x54, 0x2c, 0x84
- .byte 0
- .ascii "Paradise"
- .byte 0
-
-# Trident.
-trident_test:
- movw $0x3c4, %dx
- movb $0x0e, %al
- outb %al, %dx
- incw %dx
- inb %dx, %al
- xchgb %al, %ah
- xorb %al, %al
- outb %al, %dx
- inb %dx, %al
- xchgb %ah, %al
- movb %al, %bl # Strange thing ... in the book this wasn't
- andb $0x02, %bl # necessary but it worked on my card which
- jz setb2 # is a trident. Without it the screen goes
- # blurred ...
- andb $0xfd, %al
- jmp clrb2
-
-setb2: orb $0x02, %al
-clrb2: outb %al, %dx
- andb $0x0f, %ah
- cmpb $0x02, %ah
- je istrid
-
- xorw %bp, %bp
-istrid: ret
-
-trident_md:
- .byte 0x50, 0x1e, 0x50
- .byte 0x51, 0x2b, 0x50
- .byte 0x52, 0x3c, 0x50
- .byte 0x57, 0x19, 0x84
- .byte 0x58, 0x1e, 0x84
- .byte 0x59, 0x2b, 0x84
- .byte 0x5a, 0x3c, 0x84
- .byte 0
- .ascii "Trident"
- .byte 0
-
-# Tseng.
-tseng_test:
- movw $0x3cd, %dx
- inb %dx, %al # Could things be this simple ! :-)
- movb %al, %bl
- movb $0x55, %al
- outb %al, %dx
- inb %dx, %al
- movb %al, %ah
- movb %bl, %al
- outb %al, %dx
- cmpb $0x55, %ah
- je istsen
-
-isnot: xorw %bp, %bp
-istsen: ret
-
-tseng_md:
- .byte 0x26, 0x3c, 0x50
- .byte 0x2a, 0x28, 0x64
- .byte 0x23, 0x19, 0x84
- .byte 0x24, 0x1c, 0x84
- .byte 0x22, 0x2c, 0x84
- .byte 0x21, 0x3c, 0x84
- .byte 0
- .ascii "Tseng"
- .byte 0
-
-# Video7.
-video7_test:
- movw $0x3cc, %dx
- inb %dx, %al
- movw $0x3b4, %dx
- andb $0x01, %al
- jz even7
-
- movw $0x3d4, %dx
-even7: movb $0x0c, %al
- outb %al, %dx
- incw %dx
- inb %dx, %al
- movb %al, %bl
- movb $0x55, %al
- outb %al, %dx
- inb %dx, %al
- decw %dx
- movb $0x1f, %al
- outb %al, %dx
- incw %dx
- inb %dx, %al
- movb %al, %bh
- decw %dx
- movb $0x0c, %al
- outb %al, %dx
- incw %dx
- movb %bl, %al
- outb %al, %dx
- movb $0x55, %al
- xorb $0xea, %al
- cmpb %bh, %al
- jne isnot
-
- movb $VIDEO_FIRST_V7>>8, svga_prefix # Use special mode switching
- ret
-
-video7_md:
- .byte 0x40, 0x2b, 0x50
- .byte 0x43, 0x3c, 0x50
- .byte 0x44, 0x3c, 0x64
- .byte 0x41, 0x19, 0x84
- .byte 0x42, 0x2c, 0x84
- .byte 0x45, 0x1c, 0x84
- .byte 0
- .ascii "Video 7"
- .byte 0
-
-# Realtek VGA
-realtek_test:
- leaw idrtvga, %si
- movw $0x45, %di
- movw $0x0b, %cx
- repe
- cmpsb
- je isrt
-
- xorw %bp, %bp
-isrt: ret
-
-idrtvga: .ascii "REALTEK VGA"
-
-realtek_md:
- .byte 0x1a, 0x3c, 0x50
- .byte 0x1b, 0x19, 0x84
- .byte 0x1c, 0x1e, 0x84
- .byte 0x1d, 0x2b, 0x84
- .byte 0x1e, 0x3c, 0x84
- .byte 0
- .ascii "REALTEK"
- .byte 0
-
-#endif /* CONFIG_VIDEO_SVGA */
-
-# User-defined local mode table (VGA only)
-#ifdef CONFIG_VIDEO_LOCAL
-local_modes:
- leaw local_mode_table, %si
-locm1: lodsw
- orw %ax, %ax
- jz locm2
-
- stosw
- movsw
- jmp locm1
-
-locm2: ret
-
-# This is the table of local video modes which can be supplied manually
-# by the user. Each entry consists of mode ID (word) and dimensions
-# (byte for column count and another byte for row count). These modes
-# are placed before all SVGA and VESA modes and override them if table
-# compacting is enabled. The table must end with a zero word followed
-# by NUL-terminated video adapter name.
-local_mode_table:
- .word 0x0100 # Example: 40x25
- .byte 25,40
- .word 0
- .ascii "Local"
- .byte 0
-#endif /* CONFIG_VIDEO_LOCAL */
-
-# Read a key and return the ASCII code in al, scan code in ah
-getkey: xorb %ah, %ah
- int $0x16
- ret
-
-# Read a key with a timeout of 30 seconds.
-# The hardware clock is used to get the time.
-getkt: call gettime
- addb $30, %al # Wait 30 seconds
- cmpb $60, %al
- jl lminute
-
- subb $60, %al
-lminute:
- movb %al, %cl
-again: movb $0x01, %ah
- int $0x16
- jnz getkey # key pressed, so get it
-
- call gettime
- cmpb %cl, %al
- jne again
-
- movb $0x20, %al # timeout, return `space'
- ret
-
-# Flush the keyboard buffer
-flush: movb $0x01, %ah
- int $0x16
- jz empty
-
- xorb %ah, %ah
- int $0x16
- jmp flush
-
-empty: ret
-
-# Print hexadecimal number.
-prthw: pushw %ax
- movb %ah, %al
- call prthb
- popw %ax
-prthb: pushw %ax
- shrb $4, %al
- call prthn
- popw %ax
- andb $0x0f, %al
-prthn: cmpb $0x0a, %al
- jc prth1
-
- addb $0x07, %al
-prth1: addb $0x30, %al
- jmp prtchr
-
-# Print decimal number in al
-prtdec: pushw %ax
- pushw %cx
- xorb %ah, %ah
- movb $0x0a, %cl
- idivb %cl
- cmpb $0x09, %al
- jbe lt100
-
- call prtdec
- jmp skip10
-
-lt100: addb $0x30, %al
- call prtchr
-skip10: movb %ah, %al
- addb $0x30, %al
- call prtchr
- popw %cx
- popw %ax
- ret
-
-store_edid:
-#ifdef CONFIG_FIRMWARE_EDID
- pushw %es # just save all registers
- pushw %ax
- pushw %bx
- pushw %cx
- pushw %dx
- pushw %di
-
- pushw %fs
- popw %es
-
- movl $0x13131313, %eax # memset block with 0x13
- movw $32, %cx
- movw $0x140, %di
- cld
- rep
- stosl
-
- cmpw $0x0200, vbe_version # only do EDID on >= VBE2.0
- jl no_edid
-
- pushw %es # save ES
- xorw %di, %di # Report Capability
- pushw %di
- popw %es # ES:DI must be 0:0
- movw $0x4f15, %ax
- xorw %bx, %bx
- xorw %cx, %cx
- int $0x10
- popw %es # restore ES
-
- cmpb $0x00, %ah # call successful
- jne no_edid
-
- cmpb $0x4f, %al # function supported
- jne no_edid
-
- movw $0x4f15, %ax # do VBE/DDC
- movw $0x01, %bx
- movw $0x00, %cx
- movw $0x00, %dx
- movw $0x140, %di
- int $0x10
-
-no_edid:
- popw %di # restore all registers
- popw %dx
- popw %cx
- popw %bx
- popw %ax
- popw %es
-#endif
- ret
-
-# VIDEO_SELECT-only variables
-mt_end: .word 0 # End of video mode table if built
-edit_buf: .space 6 # Line editor buffer
-card_name: .word 0 # Pointer to adapter name
-scanning: .byte 0 # Performing mode scan
-do_restore: .byte 0 # Screen contents altered during mode change
-svga_prefix: .byte VIDEO_FIRST_BIOS>>8 # Default prefix for BIOS modes
-graphic_mode: .byte 0 # Graphic mode with a linear frame buffer
-dac_size: .byte 6 # DAC bit depth
-vbe_version: .word 0 # VBE bios version
-
-# Status messages
-keymsg: .ascii "Press <RETURN> to see video modes available, "
- .ascii "<SPACE> to continue or wait 30 secs"
- .byte 0x0d, 0x0a, 0
-
-listhdr: .byte 0x0d, 0x0a
- .ascii "Mode: COLSxROWS:"
-
-crlft: .byte 0x0d, 0x0a, 0
-
-prompt: .byte 0x0d, 0x0a
- .asciz "Enter mode number or `scan': "
-
-unknt: .asciz "Unknown mode ID. Try again."
-
-badmdt: .ascii "You passed an undefined mode number."
- .byte 0x0d, 0x0a, 0
-
-vesaer: .ascii "Error: Scanning of VESA modes failed. Please "
- .ascii "report to <mj@ucw.cz>."
- .byte 0x0d, 0x0a, 0
-
-old_name: .asciz "CGA/MDA/HGA"
-
-ega_name: .asciz "EGA"
-
-svga_name: .ascii " "
-
-vga_name: .asciz "VGA"
-
-vesa_name: .asciz "VESA"
-
-name_bann: .asciz "Video adapter: "
-#endif /* CONFIG_VIDEO_SELECT */
-
-# Other variables:
-adapter: .byte 0 # Video adapter: 0=CGA/MDA/HGA,1=EGA,2=VGA
-video_segment: .word 0xb800 # Video memory segment
-force_size: .word 0 # Use this size instead of the one in BIOS vars
+++ /dev/null
-/* Check if CPU has some minimum CPUID bits
- This runs in 16bit mode so that the caller can still use the BIOS
- to output errors on the screen */
-#include <asm/cpufeature.h>
-#include <asm/msr.h>
-
-verify_cpu:
- pushfl # Save caller passed flags
- pushl $0 # Kill any dangerous flags
- popfl
-
-#if CONFIG_X86_MINIMUM_CPU_FAMILY >= 4
- pushfl
- pop %eax
- orl $(1<<18),%eax # try setting AC
- push %eax
- popfl
- pushfl
- popl %eax
- testl $(1<<18),%eax
- jz bad
-#endif
-#if REQUIRED_MASK0 != 0
- pushfl # standard way to check for cpuid
- popl %eax
- movl %eax,%ebx
- xorl $0x200000,%eax
- pushl %eax
- popfl
- pushfl
- popl %eax
- cmpl %eax,%ebx
- pushfl # standard way to check for cpuid
- popl %eax
- movl %eax,%ebx
- xorl $0x200000,%eax
- pushl %eax
- popfl
- pushfl
- popl %eax
- cmpl %eax,%ebx
- jz bad # REQUIRED_MASK0 != 0 requires CPUID
-
- movl $0x0,%eax # See if cpuid 1 is implemented
- cpuid
- cmpl $0x1,%eax
- jb bad # no cpuid 1
-
-#if REQUIRED_MASK0 & NEED_CMPXCHG64
- /* Some VIA C3s need magic MSRs to enable CX64. Do this here */
- cmpl $0x746e6543,%ebx # Cent
- jne 1f
- cmpl $0x48727561,%edx # aurH
- jne 1f
- cmpl $0x736c7561,%ecx # auls
- jne 1f
- movl $1,%eax # check model
- cpuid
- movl %eax,%ebx
- shr $8,%ebx
- andl $0xf,%ebx
- cmp $6,%ebx # check family == 6
- jne 1f
- shr $4,%eax
- andl $0xf,%eax
- cmpl $6,%eax # check model >= 6
- jb 1f
- # assume models >= 6 all support this MSR
- movl $MSR_VIA_FCR,%ecx
- rdmsr
- orl $((1<<1)|(1<<7)),%eax # enable CMPXCHG64 and PGE
- wrmsr
-1:
-#endif
- movl $0x1,%eax # Does the cpu have what it takes
- cpuid
-
-#if CONFIG_X86_MINIMUM_CPU_FAMILY > 4
-#error add proper model checking here
-#endif
-
- andl $REQUIRED_MASK0,%edx
- xorl $REQUIRED_MASK0,%edx
- jnz bad
-#endif /* REQUIRED_MASK0 */
-
- popfl
- xor %eax,%eax
- ret
-
-bad:
- popfl
- movl $1,%eax
- ret
#define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */
#define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
in boot_params - treat this as 1 byte */
-#define EDD_CL_EQUALS 0x3d646465 /* "edd=" */
-#define EDD_CL_OFF 0x666f /* "of" for off */
-#define EDD_CL_SKIP 0x6b73 /* "sk" for skipmbr */
-#define EDD_CL_ON 0x6e6f /* "on" for on */
#ifndef __ASSEMBLY__
projects / linux-2.6 / commitdiff