From 4fd06960f120e02e9abc802a09f9511c400042a5 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Wed, 11 Jul 2007 12:18:56 -0700 Subject: [PATCH] Use the new x86 setup code for i386 This patch hooks the new x86 setup code into the Makefile machinery. It also adapts boot/tools/build.c to a two-file (as opposed to three-file) universe, and simplifies it substantially. Signed-off-by: H. Peter Anvin Signed-off-by: Linus Torvalds --- arch/i386/boot/Makefile | 48 +++++++-- arch/i386/boot/compressed/Makefile | 7 +- arch/i386/boot/tools/build.c | 160 +++++++++++++---------------- 3 files changed, 118 insertions(+), 97 deletions(-) diff --git a/arch/i386/boot/Makefile b/arch/i386/boot/Makefile index bfbc32098a..08678a0a3d 100644 --- a/arch/i386/boot/Makefile +++ b/arch/i386/boot/Makefile @@ -25,27 +25,56 @@ SVGA_MODE := -DSVGA_MODE=NORMAL_VGA #RAMDISK := -DRAMDISK=512 -targets := vmlinux.bin bootsect bootsect.o \ - setup setup.o zImage bzImage +targets := vmlinux.bin setup.bin setup.elf zImage bzImage subdir- := compressed +setup-y += a20.o apm.o cmdline.o copy.o cpu.o cpucheck.o edd.o +setup-y += header.o main.o mca.o memory.o pm.o pmjump.o +setup-y += printf.o string.o tty.o video.o version.o voyager.o + +# The link order of the video-*.o modules can matter. In particular, +# video-vga.o *must* be listed first, followed by video-vesa.o. +# Hardware-specific drivers should follow in the order they should be +# probed, and video-bios.o should typically be last. +setup-y += video-vga.o +setup-y += video-vesa.o +setup-y += video-bios.o + hostprogs-y := tools/build HOSTCFLAGS_build.o := $(LINUXINCLUDE) # --------------------------------------------------------------------------- +# How to compile the 16-bit code. Note we always compile for -march=i386, +# that way we can complain to the user if the CPU is insufficient. +cflags-i386 := +cflags-x86_64 := -m32 +CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \ + $(cflags-$(ARCH)) \ + -Wall -Wstrict-prototypes \ + -march=i386 -mregparm=3 \ + -include $(srctree)/$(src)/code16gcc.h \ + -fno-strict-aliasing -fomit-frame-pointer \ + $(call cc-option, -ffreestanding) \ + $(call cc-option, -fno-toplevel-reorder,\ + $(call cc-option, -fno-unit-at-a-time)) \ + $(call cc-option, -fno-stack-protector) \ + $(call cc-option, -mpreferred-stack-boundary=2) +AFLAGS := $(CFLAGS) -D__ASSEMBLY__ + $(obj)/zImage: IMAGE_OFFSET := 0x1000 $(obj)/zImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) $(obj)/bzImage: IMAGE_OFFSET := 0x100000 +$(obj)/bzImage: EXTRA_CFLAGS := -D__BIG_KERNEL__ $(obj)/bzImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) -D__BIG_KERNEL__ $(obj)/bzImage: BUILDFLAGS := -b quiet_cmd_image = BUILD $@ -cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/bootsect $(obj)/setup \ +cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/setup.bin \ $(obj)/vmlinux.bin $(ROOT_DEV) > $@ -$(obj)/zImage $(obj)/bzImage: $(obj)/bootsect $(obj)/setup \ +$(obj)/zImage $(obj)/bzImage: $(obj)/setup.bin \ $(obj)/vmlinux.bin $(obj)/tools/build FORCE $(call if_changed,image) @echo 'Kernel: $@ is ready' ' (#'`cat .version`')' @@ -53,12 +82,17 @@ $(obj)/zImage $(obj)/bzImage: $(obj)/bootsect $(obj)/setup \ $(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE $(call if_changed,objcopy) -LDFLAGS_bootsect := -Ttext 0x0 -s --oformat binary -LDFLAGS_setup := -Ttext 0x0 -s --oformat binary -e begtext +SETUP_OBJS = $(addprefix $(obj)/,$(setup-y)) -$(obj)/setup $(obj)/bootsect: %: %.o FORCE +LDFLAGS_setup.elf := -T +$(obj)/setup.elf: $(src)/setup.ld $(SETUP_OBJS) FORCE $(call if_changed,ld) +OBJCOPYFLAGS_setup.bin := -O binary + +$(obj)/setup.bin: $(obj)/setup.elf FORCE + $(call if_changed,objcopy) + $(obj)/compressed/vmlinux: FORCE $(Q)$(MAKE) $(build)=$(obj)/compressed IMAGE_OFFSET=$(IMAGE_OFFSET) $@ diff --git a/arch/i386/boot/compressed/Makefile b/arch/i386/boot/compressed/Makefile index a661217f33..189fa1dbef 100644 --- a/arch/i386/boot/compressed/Makefile +++ b/arch/i386/boot/compressed/Makefile @@ -9,9 +9,14 @@ targets := vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o \ EXTRA_AFLAGS := -traditional LDFLAGS_vmlinux := -T -CFLAGS_misc.o += -fPIC hostprogs-y := relocs +CFLAGS := -m32 -D__KERNEL__ $(LINUX_INCLUDE) -O2 \ + -fno-strict-aliasing -fPIC \ + $(call cc-option,-ffreestanding) \ + $(call cc-option,-fno-stack-protector) +LDFLAGS := -m elf_i386 + $(obj)/vmlinux: $(src)/vmlinux.lds $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o FORCE $(call if_changed,ld) @: diff --git a/arch/i386/boot/tools/build.c b/arch/i386/boot/tools/build.c index 05798419a6..886f47d8a4 100644 --- a/arch/i386/boot/tools/build.c +++ b/arch/i386/boot/tools/build.c @@ -1,13 +1,12 @@ /* * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1997 Martin Mares + * Copyright (C) 2007 H. Peter Anvin */ /* * This file builds a disk-image from three different files: * - * - bootsect: compatibility mbr which prints an error message if - * someone tries to boot the kernel directly. * - setup: 8086 machine code, sets up system parm * - system: 80386 code for actual system * @@ -21,6 +20,7 @@ * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 * Cross compiling fixes by Gertjan van Wingerde, July 1996 * Rewritten by Martin Mares, April 1997 + * Substantially overhauled by H. Peter Anvin, April 2007 */ #include @@ -32,23 +32,25 @@ #include #include #include +#include #include -typedef unsigned char byte; -typedef unsigned short word; -typedef unsigned long u32; +typedef unsigned char u8; +typedef unsigned short u16; +typedef unsigned long u32; #define DEFAULT_MAJOR_ROOT 0 #define DEFAULT_MINOR_ROOT 0 -/* Minimal number of setup sectors (see also bootsect.S) */ -#define SETUP_SECTS 4 +/* Minimal number of setup sectors */ +#define SETUP_SECT_MIN 5 +#define SETUP_SECT_MAX 64 -byte buf[1024]; -int fd; +/* This must be large enough to hold the entire setup */ +u8 buf[SETUP_SECT_MAX*512]; int is_big_kernel; -void die(const char * str, ...) +static void die(const char * str, ...) { va_list args; va_start(args, str); @@ -57,15 +59,9 @@ void die(const char * str, ...) exit(1); } -void file_open(const char *name) +static void usage(void) { - if ((fd = open(name, O_RDONLY, 0)) < 0) - die("Unable to open `%s': %m", name); -} - -void usage(void) -{ - die("Usage: build [-b] bootsect setup system [rootdev] [> image]"); + die("Usage: build [-b] setup system [rootdev] [> image]"); } int main(int argc, char ** argv) @@ -73,27 +69,30 @@ int main(int argc, char ** argv) unsigned int i, sz, setup_sectors; int c; u32 sys_size; - byte major_root, minor_root; + u8 major_root, minor_root; struct stat sb; + FILE *file; + int fd; + void *kernel; if (argc > 2 && !strcmp(argv[1], "-b")) { is_big_kernel = 1; argc--, argv++; } - if ((argc < 4) || (argc > 5)) + if ((argc < 3) || (argc > 4)) usage(); - if (argc > 4) { - if (!strcmp(argv[4], "CURRENT")) { + if (argc > 3) { + if (!strcmp(argv[3], "CURRENT")) { if (stat("/", &sb)) { perror("/"); die("Couldn't stat /"); } major_root = major(sb.st_dev); minor_root = minor(sb.st_dev); - } else if (strcmp(argv[4], "FLOPPY")) { - if (stat(argv[4], &sb)) { - perror(argv[4]); + } else if (strcmp(argv[3], "FLOPPY")) { + if (stat(argv[3], &sb)) { + perror(argv[3]); die("Couldn't stat root device."); } major_root = major(sb.st_rdev); @@ -108,79 +107,62 @@ int main(int argc, char ** argv) } fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root); - file_open(argv[1]); - i = read(fd, buf, sizeof(buf)); - fprintf(stderr,"Boot sector %d bytes.\n",i); - if (i != 512) - die("Boot block must be exactly 512 bytes"); + /* Copy the setup code */ + file = fopen(argv[1], "r"); + if (!file) + die("Unable to open `%s': %m", argv[1]); + c = fread(buf, 1, sizeof(buf), file); + if (ferror(file)) + die("read-error on `setup'"); + if (c < 1024) + die("The setup must be at least 1024 bytes"); if (buf[510] != 0x55 || buf[511] != 0xaa) die("Boot block hasn't got boot flag (0xAA55)"); + fclose(file); + + /* Pad unused space with zeros */ + setup_sectors = (c + 511) / 512; + if (setup_sectors < SETUP_SECT_MIN) + setup_sectors = SETUP_SECT_MIN; + i = setup_sectors*512; + memset(buf+c, 0, i-c); + + /* Set the default root device */ buf[508] = minor_root; buf[509] = major_root; - if (write(1, buf, 512) != 512) - die("Write call failed"); - close (fd); - - file_open(argv[2]); /* Copy the setup code */ - for (i=0 ; (c=read(fd, buf, sizeof(buf)))>0 ; i+=c ) - if (write(1, buf, c) != c) - die("Write call failed"); - if (c != 0) - die("read-error on `setup'"); - close (fd); - - setup_sectors = (i + 511) / 512; /* Pad unused space with zeros */ - /* for compatibility with ancient versions of LILO. */ - if (setup_sectors < SETUP_SECTS) - setup_sectors = SETUP_SECTS; - fprintf(stderr, "Setup is %d bytes.\n", i); - memset(buf, 0, sizeof(buf)); - while (i < setup_sectors * 512) { - c = setup_sectors * 512 - i; - if (c > sizeof(buf)) - c = sizeof(buf); - if (write(1, buf, c) != c) - die("Write call failed"); - i += c; - } - file_open(argv[3]); - if (fstat (fd, &sb)) - die("Unable to stat `%s': %m", argv[3]); + fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i); + + /* Open and stat the kernel file */ + fd = open(argv[2], O_RDONLY); + if (fd < 0) + die("Unable to open `%s': %m", argv[2]); + if (fstat(fd, &sb)) + die("Unable to stat `%s': %m", argv[2]); sz = sb.st_size; - fprintf (stderr, "System is %d kB\n", sz/1024); + fprintf (stderr, "System is %d kB\n", (sz+1023)/1024); + kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0); + if (kernel == MAP_FAILED) + die("Unable to mmap '%s': %m", argv[2]); sys_size = (sz + 15) / 16; if (!is_big_kernel && sys_size > DEF_SYSSIZE) die("System is too big. Try using bzImage or modules."); - while (sz > 0) { - int l, n; - - l = (sz > sizeof(buf)) ? sizeof(buf) : sz; - if ((n=read(fd, buf, l)) != l) { - if (n < 0) - die("Error reading %s: %m", argv[3]); - else - die("%s: Unexpected EOF", argv[3]); - } - if (write(1, buf, l) != l) - die("Write failed"); - sz -= l; - } + + /* Patch the setup code with the appropriate size parameters */ + buf[0x1f1] = setup_sectors-1; + buf[0x1f4] = sys_size; + buf[0x1f5] = sys_size >> 8; + buf[0x1f6] = sys_size >> 16; + buf[0x1f7] = sys_size >> 24; + + if (fwrite(buf, 1, i, stdout) != i) + die("Writing setup failed"); + + /* Copy the kernel code */ + if (fwrite(kernel, 1, sz, stdout) != sz) + die("Writing kernel failed"); close(fd); - if (lseek(1, 497, SEEK_SET) != 497) /* Write sizes to the bootsector */ - die("Output: seek failed"); - buf[0] = setup_sectors; - if (write(1, buf, 1) != 1) - die("Write of setup sector count failed"); - if (lseek(1, 500, SEEK_SET) != 500) - die("Output: seek failed"); - buf[0] = (sys_size & 0xff); - buf[1] = ((sys_size >> 8) & 0xff); - buf[2] = ((sys_size >> 16) & 0xff); - buf[3] = ((sys_size >> 24) & 0xff); - if (write(1, buf, 4) != 4) - die("Write of image length failed"); - - return 0; /* Everything is OK */ + /* Everything is OK */ + return 0; } -- 2.39.5