2 * Procedures for interfacing to Open Firmware.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/config.h>
20 #include <linux/kernel.h>
21 #include <linux/string.h>
22 #include <linux/init.h>
23 #include <linux/threads.h>
24 #include <linux/spinlock.h>
25 #include <linux/types.h>
26 #include <linux/pci.h>
27 #include <linux/proc_fs.h>
28 #include <linux/stringify.h>
29 #include <linux/delay.h>
30 #include <linux/initrd.h>
31 #include <linux/bitops.h>
35 #include <asm/processor.h>
39 #include <asm/system.h>
41 #include <asm/pgtable.h>
43 #include <asm/iommu.h>
44 #include <asm/btext.h>
45 #include <asm/sections.h>
46 #include <asm/machdep.h>
48 #ifdef CONFIG_LOGO_LINUX_CLUT224
49 #include <linux/linux_logo.h>
50 extern const struct linux_logo logo_linux_clut224;
54 * Properties whose value is longer than this get excluded from our
55 * copy of the device tree. This value does need to be big enough to
56 * ensure that we don't lose things like the interrupt-map property
57 * on a PCI-PCI bridge.
59 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
62 * Eventually bump that one up
64 #define DEVTREE_CHUNK_SIZE 0x100000
67 * This is the size of the local memory reserve map that gets copied
68 * into the boot params passed to the kernel. That size is totally
69 * flexible as the kernel just reads the list until it encounters an
70 * entry with size 0, so it can be changed without breaking binary
73 #define MEM_RESERVE_MAP_SIZE 8
76 * prom_init() is called very early on, before the kernel text
77 * and data have been mapped to KERNELBASE. At this point the code
78 * is running at whatever address it has been loaded at.
79 * On ppc32 we compile with -mrelocatable, which means that references
80 * to extern and static variables get relocated automatically.
81 * On ppc64 we have to relocate the references explicitly with
82 * RELOC. (Note that strings count as static variables.)
84 * Because OF may have mapped I/O devices into the area starting at
85 * KERNELBASE, particularly on CHRP machines, we can't safely call
86 * OF once the kernel has been mapped to KERNELBASE. Therefore all
87 * OF calls must be done within prom_init().
89 * ADDR is used in calls to call_prom. The 4th and following
90 * arguments to call_prom should be 32-bit values.
91 * On ppc64, 64 bit values are truncated to 32 bits (and
92 * fortunately don't get interpreted as two arguments).
95 #define RELOC(x) (*PTRRELOC(&(x)))
96 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
97 #define OF_WORKAROUNDS 0
100 #define ADDR(x) (u32) (x)
101 #define OF_WORKAROUNDS of_workarounds
105 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
106 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
108 #define PROM_BUG() do { \
109 prom_printf("kernel BUG at %s line 0x%x!\n", \
110 RELOC(__FILE__), __LINE__); \
111 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
115 #define prom_debug(x...) prom_printf(x)
117 #define prom_debug(x...)
121 typedef u32 prom_arg_t;
139 struct mem_map_entry {
146 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
149 extern int enter_prom(struct prom_args *args, unsigned long entry);
151 static inline int enter_prom(struct prom_args *args, unsigned long entry)
153 return ((int (*)(struct prom_args *))entry)(args);
157 extern void copy_and_flush(unsigned long dest, unsigned long src,
158 unsigned long size, unsigned long offset);
161 static struct prom_t __initdata prom;
163 static unsigned long prom_entry __initdata;
165 #define PROM_SCRATCH_SIZE 256
167 static char __initdata of_stdout_device[256];
168 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
170 static unsigned long __initdata dt_header_start;
171 static unsigned long __initdata dt_struct_start, dt_struct_end;
172 static unsigned long __initdata dt_string_start, dt_string_end;
174 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
177 static int __initdata iommu_force_on;
178 static int __initdata ppc64_iommu_off;
179 static unsigned long __initdata prom_tce_alloc_start;
180 static unsigned long __initdata prom_tce_alloc_end;
183 /* Platforms codes are now obsolete in the kernel. Now only used within this
184 * file and ultimately gone too. Feel free to change them if you need, they
185 * are not shared with anything outside of this file anymore
187 #define PLATFORM_PSERIES 0x0100
188 #define PLATFORM_PSERIES_LPAR 0x0101
189 #define PLATFORM_LPAR 0x0001
190 #define PLATFORM_POWERMAC 0x0400
191 #define PLATFORM_GENERIC 0x0500
193 static int __initdata of_platform;
195 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
197 static unsigned long __initdata alloc_top;
198 static unsigned long __initdata alloc_top_high;
199 static unsigned long __initdata alloc_bottom;
200 static unsigned long __initdata rmo_top;
201 static unsigned long __initdata ram_top;
203 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
204 static int __initdata mem_reserve_cnt;
206 static cell_t __initdata regbuf[1024];
209 #define MAX_CPU_THREADS 2
212 * Error results ... some OF calls will return "-1" on error, some
213 * will return 0, some will return either. To simplify, here are
214 * macros to use with any ihandle or phandle return value to check if
218 #define PROM_ERROR (-1u)
219 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
220 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
223 /* This is the one and *ONLY* place where we actually call open
227 static int __init call_prom(const char *service, int nargs, int nret, ...)
230 struct prom_args args;
233 args.service = ADDR(service);
237 va_start(list, nret);
238 for (i = 0; i < nargs; i++)
239 args.args[i] = va_arg(list, prom_arg_t);
242 for (i = 0; i < nret; i++)
243 args.args[nargs+i] = 0;
245 if (enter_prom(&args, RELOC(prom_entry)) < 0)
248 return (nret > 0) ? args.args[nargs] : 0;
251 static int __init call_prom_ret(const char *service, int nargs, int nret,
252 prom_arg_t *rets, ...)
255 struct prom_args args;
258 args.service = ADDR(service);
262 va_start(list, rets);
263 for (i = 0; i < nargs; i++)
264 args.args[i] = va_arg(list, prom_arg_t);
267 for (i = 0; i < nret; i++)
268 args.args[nargs+i] = 0;
270 if (enter_prom(&args, RELOC(prom_entry)) < 0)
274 for (i = 1; i < nret; ++i)
275 rets[i-1] = args.args[nargs+i];
277 return (nret > 0) ? args.args[nargs] : 0;
281 static void __init prom_print(const char *msg)
284 struct prom_t *_prom = &RELOC(prom);
286 if (_prom->stdout == 0)
289 for (p = msg; *p != 0; p = q) {
290 for (q = p; *q != 0 && *q != '\n'; ++q)
293 call_prom("write", 3, 1, _prom->stdout, p, q - p);
297 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
302 static void __init prom_print_hex(unsigned long val)
304 int i, nibbles = sizeof(val)*2;
305 char buf[sizeof(val)*2+1];
306 struct prom_t *_prom = &RELOC(prom);
308 for (i = nibbles-1; i >= 0; i--) {
309 buf[i] = (val & 0xf) + '0';
311 buf[i] += ('a'-'0'-10);
315 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
319 static void __init prom_printf(const char *format, ...)
321 const char *p, *q, *s;
324 struct prom_t *_prom = &RELOC(prom);
326 va_start(args, format);
328 format = PTRRELOC(format);
330 for (p = format; *p != 0; p = q) {
331 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
334 call_prom("write", 3, 1, _prom->stdout, p, q - p);
339 call_prom("write", 3, 1, _prom->stdout,
349 s = va_arg(args, const char *);
354 v = va_arg(args, unsigned long);
362 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
365 struct prom_t *_prom = &RELOC(prom);
367 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
369 * Old OF requires we claim physical and virtual separately
370 * and then map explicitly (assuming virtual mode)
375 ret = call_prom_ret("call-method", 5, 2, &result,
376 ADDR("claim"), _prom->memory,
378 if (ret != 0 || result == -1)
380 ret = call_prom_ret("call-method", 5, 2, &result,
381 ADDR("claim"), _prom->mmumap,
384 call_prom("call-method", 4, 1, ADDR("release"),
385 _prom->memory, size, virt);
388 /* the 0x12 is M (coherence) + PP == read/write */
389 call_prom("call-method", 6, 1,
390 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
393 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
397 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
400 reason = PTRRELOC(reason);
403 /* Do not call exit because it clears the screen on pmac
404 * it also causes some sort of double-fault on early pmacs */
405 if (RELOC(of_platform) == PLATFORM_POWERMAC)
408 /* ToDo: should put up an SRC here on p/iSeries */
409 call_prom("exit", 0, 0);
411 for (;;) /* should never get here */
416 static int __init prom_next_node(phandle *nodep)
420 if ((node = *nodep) != 0
421 && (*nodep = call_prom("child", 1, 1, node)) != 0)
423 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
426 if ((node = call_prom("parent", 1, 1, node)) == 0)
428 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
433 static int inline prom_getprop(phandle node, const char *pname,
434 void *value, size_t valuelen)
436 return call_prom("getprop", 4, 1, node, ADDR(pname),
437 (u32)(unsigned long) value, (u32) valuelen);
440 static int inline prom_getproplen(phandle node, const char *pname)
442 return call_prom("getproplen", 2, 1, node, ADDR(pname));
445 static void add_string(char **str, const char *q)
455 static char *tohex(unsigned int x)
457 static char digits[] = "0123456789abcdef";
458 static char result[9];
465 result[i] = digits[x & 0xf];
467 } while (x != 0 && i > 0);
471 static int __init prom_setprop(phandle node, const char *nodename,
472 const char *pname, void *value, size_t valuelen)
476 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
477 return call_prom("setprop", 4, 1, node, ADDR(pname),
478 (u32)(unsigned long) value, (u32) valuelen);
480 /* gah... setprop doesn't work on longtrail, have to use interpret */
482 add_string(&p, "dev");
483 add_string(&p, nodename);
484 add_string(&p, tohex((u32)(unsigned long) value));
485 add_string(&p, tohex(valuelen));
486 add_string(&p, tohex(ADDR(pname)));
487 add_string(&p, tohex(strlen(RELOC(pname))));
488 add_string(&p, "property");
490 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
493 /* We can't use the standard versions because of RELOC headaches. */
494 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
495 || ('a' <= (c) && (c) <= 'f') \
496 || ('A' <= (c) && (c) <= 'F'))
498 #define isdigit(c) ('0' <= (c) && (c) <= '9')
499 #define islower(c) ('a' <= (c) && (c) <= 'z')
500 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
502 unsigned long prom_strtoul(const char *cp, const char **endp)
504 unsigned long result = 0, base = 10, value;
509 if (toupper(*cp) == 'X') {
515 while (isxdigit(*cp) &&
516 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
517 result = result * base + value;
527 unsigned long prom_memparse(const char *ptr, const char **retptr)
529 unsigned long ret = prom_strtoul(ptr, retptr);
533 * We can't use a switch here because GCC *may* generate a
534 * jump table which won't work, because we're not running at
535 * the address we're linked at.
537 if ('G' == **retptr || 'g' == **retptr)
540 if ('M' == **retptr || 'm' == **retptr)
543 if ('K' == **retptr || 'k' == **retptr)
555 * Early parsing of the command line passed to the kernel, used for
556 * "mem=x" and the options that affect the iommu
558 static void __init early_cmdline_parse(void)
560 struct prom_t *_prom = &RELOC(prom);
565 RELOC(prom_cmd_line[0]) = 0;
566 p = RELOC(prom_cmd_line);
567 if ((long)_prom->chosen > 0)
568 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
569 #ifdef CONFIG_CMDLINE
570 if (l <= 0 || p[0] == '\0') /* dbl check */
571 strlcpy(RELOC(prom_cmd_line),
572 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
573 #endif /* CONFIG_CMDLINE */
574 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
577 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
579 prom_printf("iommu opt is: %s\n", opt);
581 while (*opt && *opt == ' ')
583 if (!strncmp(opt, RELOC("off"), 3))
584 RELOC(ppc64_iommu_off) = 1;
585 else if (!strncmp(opt, RELOC("force"), 5))
586 RELOC(iommu_force_on) = 1;
591 #ifdef CONFIG_PPC_PSERIES
593 * There are two methods for telling firmware what our capabilities are.
594 * Newer machines have an "ibm,client-architecture-support" method on the
595 * root node. For older machines, we have to call the "process-elf-header"
596 * method in the /packages/elf-loader node, passing it a fake 32-bit
597 * ELF header containing a couple of PT_NOTE sections that contain
598 * structures that contain various information.
602 * New method - extensible architecture description vector.
604 * Because the description vector contains a mix of byte and word
605 * values, we declare it as an unsigned char array, and use this
606 * macro to put word values in.
608 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
609 ((x) >> 8) & 0xff, (x) & 0xff
611 /* Option vector bits - generic bits in byte 1 */
612 #define OV_IGNORE 0x80 /* ignore this vector */
613 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
615 /* Option vector 1: processor architectures supported */
616 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
617 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
618 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
619 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
620 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
621 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
623 /* Option vector 2: Open Firmware options supported */
624 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
626 /* Option vector 3: processor options supported */
627 #define OV3_FP 0x80 /* floating point */
628 #define OV3_VMX 0x40 /* VMX/Altivec */
630 /* Option vector 5: PAPR/OF options supported */
631 #define OV5_LPAR 0x80 /* logical partitioning supported */
632 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
633 /* ibm,dynamic-reconfiguration-memory property supported */
634 #define OV5_DRCONF_MEMORY 0x20
635 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
638 * The architecture vector has an array of PVR mask/value pairs,
639 * followed by # option vectors - 1, followed by the option vectors.
641 static unsigned char ibm_architecture_vec[] = {
642 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
643 W(0xffff0000), W(0x003e0000), /* POWER6 */
644 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
645 5 - 1, /* 5 option vectors */
647 /* option vector 1: processor architectures supported */
649 0, /* don't ignore, don't halt */
650 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
651 OV1_PPC_2_04 | OV1_PPC_2_05,
653 /* option vector 2: Open Firmware options supported */
657 W(0xffffffff), /* real_base */
658 W(0xffffffff), /* real_size */
659 W(0xffffffff), /* virt_base */
660 W(0xffffffff), /* virt_size */
661 W(0xffffffff), /* load_base */
662 W(64), /* 128MB min RMA */
663 W(0xffffffff), /* full client load */
664 0, /* min RMA percentage of total RAM */
665 48, /* max log_2(hash table size) */
667 /* option vector 3: processor options supported */
669 0, /* don't ignore, don't halt */
672 /* option vector 4: IBM PAPR implementation */
676 /* option vector 5: PAPR/OF options */
678 0, /* don't ignore, don't halt */
679 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES,
682 /* Old method - ELF header with PT_NOTE sections */
683 static struct fake_elf {
690 char name[8]; /* "PowerPC" */
704 char name[24]; /* "IBM,RPA-Client-Config" */
718 .e_ident = { 0x7f, 'E', 'L', 'F',
719 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
720 .e_type = ET_EXEC, /* yeah right */
722 .e_version = EV_CURRENT,
723 .e_phoff = offsetof(struct fake_elf, phdr),
724 .e_phentsize = sizeof(Elf32_Phdr),
730 .p_offset = offsetof(struct fake_elf, chrpnote),
731 .p_filesz = sizeof(struct chrpnote)
734 .p_offset = offsetof(struct fake_elf, rpanote),
735 .p_filesz = sizeof(struct rpanote)
739 .namesz = sizeof("PowerPC"),
740 .descsz = sizeof(struct chrpdesc),
744 .real_mode = ~0U, /* ~0 means "don't care" */
753 .namesz = sizeof("IBM,RPA-Client-Config"),
754 .descsz = sizeof(struct rpadesc),
756 .name = "IBM,RPA-Client-Config",
759 .min_rmo_size = 64, /* in megabytes */
760 .min_rmo_percent = 0,
761 .max_pft_size = 48, /* 2^48 bytes max PFT size */
769 static void __init prom_send_capabilities(void)
771 ihandle elfloader, root;
774 root = call_prom("open", 1, 1, ADDR("/"));
776 /* try calling the ibm,client-architecture-support method */
777 if (call_prom_ret("call-method", 3, 2, &ret,
778 ADDR("ibm,client-architecture-support"),
780 ADDR(ibm_architecture_vec)) == 0) {
781 /* the call exists... */
783 prom_printf("WARNING: ibm,client-architecture"
784 "-support call FAILED!\n");
785 call_prom("close", 1, 0, root);
788 call_prom("close", 1, 0, root);
791 /* no ibm,client-architecture-support call, try the old way */
792 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
793 if (elfloader == 0) {
794 prom_printf("couldn't open /packages/elf-loader\n");
797 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
798 elfloader, ADDR(&fake_elf));
799 call_prom("close", 1, 0, elfloader);
804 * Memory allocation strategy... our layout is normally:
806 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
807 * rare cases, initrd might end up being before the kernel though.
808 * We assume this won't override the final kernel at 0, we have no
809 * provision to handle that in this version, but it should hopefully
812 * alloc_top is set to the top of RMO, eventually shrink down if the
815 * alloc_bottom is set to the top of kernel/initrd
817 * from there, allocations are done this way : rtas is allocated
818 * topmost, and the device-tree is allocated from the bottom. We try
819 * to grow the device-tree allocation as we progress. If we can't,
820 * then we fail, we don't currently have a facility to restart
821 * elsewhere, but that shouldn't be necessary.
823 * Note that calls to reserve_mem have to be done explicitly, memory
824 * allocated with either alloc_up or alloc_down isn't automatically
830 * Allocates memory in the RMO upward from the kernel/initrd
832 * When align is 0, this is a special case, it means to allocate in place
833 * at the current location of alloc_bottom or fail (that is basically
834 * extending the previous allocation). Used for the device-tree flattening
836 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
838 unsigned long base = RELOC(alloc_bottom);
839 unsigned long addr = 0;
842 base = _ALIGN_UP(base, align);
843 prom_debug("alloc_up(%x, %x)\n", size, align);
844 if (RELOC(ram_top) == 0)
845 prom_panic("alloc_up() called with mem not initialized\n");
848 base = _ALIGN_UP(RELOC(alloc_bottom), align);
850 base = RELOC(alloc_bottom);
852 for(; (base + size) <= RELOC(alloc_top);
853 base = _ALIGN_UP(base + 0x100000, align)) {
854 prom_debug(" trying: 0x%x\n\r", base);
855 addr = (unsigned long)prom_claim(base, size, 0);
856 if (addr != PROM_ERROR && addr != 0)
864 RELOC(alloc_bottom) = addr;
866 prom_debug(" -> %x\n", addr);
867 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
868 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
869 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
870 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
871 prom_debug(" ram_top : %x\n", RELOC(ram_top));
877 * Allocates memory downward, either from top of RMO, or if highmem
878 * is set, from the top of RAM. Note that this one doesn't handle
879 * failures. It does claim memory if highmem is not set.
881 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
884 unsigned long base, addr = 0;
886 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
887 highmem ? RELOC("(high)") : RELOC("(low)"));
888 if (RELOC(ram_top) == 0)
889 prom_panic("alloc_down() called with mem not initialized\n");
892 /* Carve out storage for the TCE table. */
893 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
894 if (addr <= RELOC(alloc_bottom))
896 /* Will we bump into the RMO ? If yes, check out that we
897 * didn't overlap existing allocations there, if we did,
898 * we are dead, we must be the first in town !
900 if (addr < RELOC(rmo_top)) {
901 /* Good, we are first */
902 if (RELOC(alloc_top) == RELOC(rmo_top))
903 RELOC(alloc_top) = RELOC(rmo_top) = addr;
907 RELOC(alloc_top_high) = addr;
911 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
912 for (; base > RELOC(alloc_bottom);
913 base = _ALIGN_DOWN(base - 0x100000, align)) {
914 prom_debug(" trying: 0x%x\n\r", base);
915 addr = (unsigned long)prom_claim(base, size, 0);
916 if (addr != PROM_ERROR && addr != 0)
922 RELOC(alloc_top) = addr;
925 prom_debug(" -> %x\n", addr);
926 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
927 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
928 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
929 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
930 prom_debug(" ram_top : %x\n", RELOC(ram_top));
938 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
943 /* Ignore more than 2 cells */
944 while (s > sizeof(unsigned long) / 4) {
960 * Very dumb function for adding to the memory reserve list, but
961 * we don't need anything smarter at this point
963 * XXX Eventually check for collisions. They should NEVER happen.
964 * If problems seem to show up, it would be a good start to track
967 static void reserve_mem(u64 base, u64 size)
969 u64 top = base + size;
970 unsigned long cnt = RELOC(mem_reserve_cnt);
975 /* We need to always keep one empty entry so that we
976 * have our terminator with "size" set to 0 since we are
977 * dumb and just copy this entire array to the boot params
979 base = _ALIGN_DOWN(base, PAGE_SIZE);
980 top = _ALIGN_UP(top, PAGE_SIZE);
983 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
984 prom_panic("Memory reserve map exhausted !\n");
985 RELOC(mem_reserve_map)[cnt].base = base;
986 RELOC(mem_reserve_map)[cnt].size = size;
987 RELOC(mem_reserve_cnt) = cnt + 1;
991 * Initialize memory allocation mecanism, parse "memory" nodes and
992 * obtain that way the top of memory and RMO to setup out local allocator
994 static void __init prom_init_mem(void)
997 char *path, type[64];
1000 struct prom_t *_prom = &RELOC(prom);
1004 * We iterate the memory nodes to find
1005 * 1) top of RMO (first node)
1009 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
1011 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
1012 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1013 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1015 prom_debug("scanning memory:\n");
1016 path = RELOC(prom_scratch);
1018 for (node = 0; prom_next_node(&node); ) {
1020 prom_getprop(node, "device_type", type, sizeof(type));
1024 * CHRP Longtrail machines have no device_type
1025 * on the memory node, so check the name instead...
1027 prom_getprop(node, "name", type, sizeof(type));
1029 if (strcmp(type, RELOC("memory")))
1032 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
1033 if (plen > sizeof(regbuf)) {
1034 prom_printf("memory node too large for buffer !\n");
1035 plen = sizeof(regbuf);
1038 endp = p + (plen / sizeof(cell_t));
1041 memset(path, 0, PROM_SCRATCH_SIZE);
1042 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1043 prom_debug(" node %s :\n", path);
1044 #endif /* DEBUG_PROM */
1046 while ((endp - p) >= (rac + rsc)) {
1047 unsigned long base, size;
1049 base = prom_next_cell(rac, &p);
1050 size = prom_next_cell(rsc, &p);
1054 prom_debug(" %x %x\n", base, size);
1055 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
1056 RELOC(rmo_top) = size;
1057 if ((base + size) > RELOC(ram_top))
1058 RELOC(ram_top) = base + size;
1062 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
1064 /* Check if we have an initrd after the kernel, if we do move our bottom
1067 if (RELOC(prom_initrd_start)) {
1068 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
1069 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
1073 * Setup our top alloc point, that is top of RMO or top of
1074 * segment 0 when running non-LPAR.
1075 * Some RS64 machines have buggy firmware where claims up at
1076 * 1GB fail. Cap at 768MB as a workaround.
1077 * Since 768MB is plenty of room, and we need to cap to something
1078 * reasonable on 32-bit, cap at 768MB on all machines.
1080 if (!RELOC(rmo_top))
1081 RELOC(rmo_top) = RELOC(ram_top);
1082 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
1083 RELOC(alloc_top) = RELOC(rmo_top);
1084 RELOC(alloc_top_high) = RELOC(ram_top);
1086 prom_printf("memory layout at init:\n");
1087 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1088 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
1089 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1090 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
1091 prom_printf(" ram_top : %x\n", RELOC(ram_top));
1096 * Allocate room for and instantiate RTAS
1098 static void __init prom_instantiate_rtas(void)
1102 u32 base, entry = 0;
1105 prom_debug("prom_instantiate_rtas: start...\n");
1107 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1108 prom_debug("rtas_node: %x\n", rtas_node);
1109 if (!PHANDLE_VALID(rtas_node))
1112 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1116 base = alloc_down(size, PAGE_SIZE, 0);
1118 prom_printf("RTAS allocation failed !\n");
1122 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1123 if (!IHANDLE_VALID(rtas_inst)) {
1124 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1128 prom_printf("instantiating rtas at 0x%x ...", base);
1130 if (call_prom_ret("call-method", 3, 2, &entry,
1131 ADDR("instantiate-rtas"),
1132 rtas_inst, base) != 0
1134 prom_printf(" failed\n");
1137 prom_printf(" done\n");
1139 reserve_mem(base, size);
1141 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1142 &base, sizeof(base));
1143 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1144 &entry, sizeof(entry));
1146 prom_debug("rtas base = 0x%x\n", base);
1147 prom_debug("rtas entry = 0x%x\n", entry);
1148 prom_debug("rtas size = 0x%x\n", (long)size);
1150 prom_debug("prom_instantiate_rtas: end...\n");
1155 * Allocate room for and initialize TCE tables
1157 static void __init prom_initialize_tce_table(void)
1161 char compatible[64], type[64], model[64];
1162 char *path = RELOC(prom_scratch);
1164 u32 minalign, minsize;
1165 u64 tce_entry, *tce_entryp;
1166 u64 local_alloc_top, local_alloc_bottom;
1169 if (RELOC(ppc64_iommu_off))
1172 prom_debug("starting prom_initialize_tce_table\n");
1174 /* Cache current top of allocs so we reserve a single block */
1175 local_alloc_top = RELOC(alloc_top_high);
1176 local_alloc_bottom = local_alloc_top;
1178 /* Search all nodes looking for PHBs. */
1179 for (node = 0; prom_next_node(&node); ) {
1183 prom_getprop(node, "compatible",
1184 compatible, sizeof(compatible));
1185 prom_getprop(node, "device_type", type, sizeof(type));
1186 prom_getprop(node, "model", model, sizeof(model));
1188 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1191 /* Keep the old logic in tack to avoid regression. */
1192 if (compatible[0] != 0) {
1193 if ((strstr(compatible, RELOC("python")) == NULL) &&
1194 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1195 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1197 } else if (model[0] != 0) {
1198 if ((strstr(model, RELOC("ython")) == NULL) &&
1199 (strstr(model, RELOC("peedwagon")) == NULL) &&
1200 (strstr(model, RELOC("innipeg")) == NULL))
1204 if (prom_getprop(node, "tce-table-minalign", &minalign,
1205 sizeof(minalign)) == PROM_ERROR)
1207 if (prom_getprop(node, "tce-table-minsize", &minsize,
1208 sizeof(minsize)) == PROM_ERROR)
1209 minsize = 4UL << 20;
1212 * Even though we read what OF wants, we just set the table
1213 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1214 * By doing this, we avoid the pitfalls of trying to DMA to
1215 * MMIO space and the DMA alias hole.
1217 * On POWER4, firmware sets the TCE region by assuming
1218 * each TCE table is 8MB. Using this memory for anything
1219 * else will impact performance, so we always allocate 8MB.
1222 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1223 minsize = 8UL << 20;
1225 minsize = 4UL << 20;
1227 /* Align to the greater of the align or size */
1228 align = max(minalign, minsize);
1229 base = alloc_down(minsize, align, 1);
1231 prom_panic("ERROR, cannot find space for TCE table.\n");
1232 if (base < local_alloc_bottom)
1233 local_alloc_bottom = base;
1235 /* It seems OF doesn't null-terminate the path :-( */
1236 memset(path, 0, sizeof(path));
1237 /* Call OF to setup the TCE hardware */
1238 if (call_prom("package-to-path", 3, 1, node,
1239 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1240 prom_printf("package-to-path failed\n");
1243 /* Save away the TCE table attributes for later use. */
1244 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1245 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1247 prom_debug("TCE table: %s\n", path);
1248 prom_debug("\tnode = 0x%x\n", node);
1249 prom_debug("\tbase = 0x%x\n", base);
1250 prom_debug("\tsize = 0x%x\n", minsize);
1252 /* Initialize the table to have a one-to-one mapping
1253 * over the allocated size.
1255 tce_entryp = (unsigned long *)base;
1256 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1257 tce_entry = (i << PAGE_SHIFT);
1259 *tce_entryp = tce_entry;
1262 prom_printf("opening PHB %s", path);
1263 phb_node = call_prom("open", 1, 1, path);
1265 prom_printf("... failed\n");
1267 prom_printf("... done\n");
1269 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1270 phb_node, -1, minsize,
1271 (u32) base, (u32) (base >> 32));
1272 call_prom("close", 1, 0, phb_node);
1275 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1277 /* These are only really needed if there is a memory limit in
1278 * effect, but we don't know so export them always. */
1279 RELOC(prom_tce_alloc_start) = local_alloc_bottom;
1280 RELOC(prom_tce_alloc_end) = local_alloc_top;
1282 /* Flag the first invalid entry */
1283 prom_debug("ending prom_initialize_tce_table\n");
1288 * With CHRP SMP we need to use the OF to start the other processors.
1289 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1290 * so we have to put the processors into a holding pattern controlled
1291 * by the kernel (not OF) before we destroy the OF.
1293 * This uses a chunk of low memory, puts some holding pattern
1294 * code there and sends the other processors off to there until
1295 * smp_boot_cpus tells them to do something. The holding pattern
1296 * checks that address until its cpu # is there, when it is that
1297 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1298 * of setting those values.
1300 * We also use physical address 0x4 here to tell when a cpu
1301 * is in its holding pattern code.
1305 extern void __secondary_hold(void);
1306 extern unsigned long __secondary_hold_spinloop;
1307 extern unsigned long __secondary_hold_acknowledge;
1310 * We want to reference the copy of __secondary_hold_* in the
1311 * 0 - 0x100 address range
1313 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1315 static void __init prom_hold_cpus(void)
1322 unsigned int interrupt_server[MAX_CPU_THREADS];
1323 unsigned int cpu_threads, hw_cpu_num;
1325 struct prom_t *_prom = &RELOC(prom);
1326 unsigned long *spinloop
1327 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1328 unsigned long *acknowledge
1329 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1331 /* __secondary_hold is actually a descriptor, not the text address */
1332 unsigned long secondary_hold
1333 = __pa(*PTRRELOC((unsigned long *)__secondary_hold));
1335 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1338 prom_debug("prom_hold_cpus: start...\n");
1339 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1340 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1341 prom_debug(" 1) acknowledge = 0x%x\n",
1342 (unsigned long)acknowledge);
1343 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1344 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1346 /* Set the common spinloop variable, so all of the secondary cpus
1347 * will block when they are awakened from their OF spinloop.
1348 * This must occur for both SMP and non SMP kernels, since OF will
1349 * be trashed when we move the kernel.
1354 for (node = 0; prom_next_node(&node); ) {
1356 prom_getprop(node, "device_type", type, sizeof(type));
1357 if (strcmp(type, RELOC("cpu")) != 0)
1360 /* Skip non-configured cpus. */
1361 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1362 if (strcmp(type, RELOC("okay")) != 0)
1366 prom_getprop(node, "reg", ®, sizeof(reg));
1368 prom_debug("\ncpuid = 0x%x\n", cpuid);
1369 prom_debug("cpu hw idx = 0x%x\n", reg);
1371 /* Init the acknowledge var which will be reset by
1372 * the secondary cpu when it awakens from its OF
1375 *acknowledge = (unsigned long)-1;
1377 propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
1379 sizeof(interrupt_server));
1381 /* no property. old hardware has no SMT */
1383 interrupt_server[0] = reg; /* fake it with phys id */
1385 /* We have a threaded processor */
1386 cpu_threads = propsize / sizeof(u32);
1387 if (cpu_threads > MAX_CPU_THREADS) {
1388 prom_printf("SMT: too many threads!\n"
1389 "SMT: found %x, max is %x\n",
1390 cpu_threads, MAX_CPU_THREADS);
1391 cpu_threads = 1; /* ToDo: panic? */
1395 hw_cpu_num = interrupt_server[0];
1396 if (hw_cpu_num != _prom->cpu) {
1397 /* Primary Thread of non-boot cpu */
1398 prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
1399 call_prom("start-cpu", 3, 0, node,
1400 secondary_hold, reg);
1402 for (i = 0; (i < 100000000) &&
1403 (*acknowledge == ((unsigned long)-1)); i++ )
1406 if (*acknowledge == reg)
1407 prom_printf("done\n");
1409 prom_printf("failed: %x\n", *acknowledge);
1413 prom_printf("%x : boot cpu %x\n", cpuid, reg);
1414 #endif /* CONFIG_SMP */
1416 /* Reserve cpu #s for secondary threads. They start later. */
1417 cpuid += cpu_threads;
1420 if (cpuid > NR_CPUS)
1421 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
1422 ") exceeded: ignoring extras\n");
1424 prom_debug("prom_hold_cpus: end...\n");
1428 static void __init prom_init_client_services(unsigned long pp)
1430 struct prom_t *_prom = &RELOC(prom);
1432 /* Get a handle to the prom entry point before anything else */
1433 RELOC(prom_entry) = pp;
1435 /* get a handle for the stdout device */
1436 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1437 if (!PHANDLE_VALID(_prom->chosen))
1438 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1440 /* get device tree root */
1441 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1442 if (!PHANDLE_VALID(_prom->root))
1443 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1450 * For really old powermacs, we need to map things we claim.
1451 * For that, we need the ihandle of the mmu.
1452 * Also, on the longtrail, we need to work around other bugs.
1454 static void __init prom_find_mmu(void)
1456 struct prom_t *_prom = &RELOC(prom);
1460 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1461 if (!PHANDLE_VALID(oprom))
1463 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1465 version[sizeof(version) - 1] = 0;
1466 /* XXX might need to add other versions here */
1467 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1468 of_workarounds = OF_WA_CLAIM;
1469 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1470 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1471 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1474 _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
1475 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1476 sizeof(_prom->mmumap));
1477 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
1478 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1481 #define prom_find_mmu()
1484 static void __init prom_init_stdout(void)
1486 struct prom_t *_prom = &RELOC(prom);
1487 char *path = RELOC(of_stdout_device);
1491 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1492 prom_panic("cannot find stdout");
1494 _prom->stdout = val;
1496 /* Get the full OF pathname of the stdout device */
1497 memset(path, 0, 256);
1498 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1499 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1500 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
1502 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1503 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
1504 path, strlen(path) + 1);
1506 /* If it's a display, note it */
1507 memset(type, 0, sizeof(type));
1508 prom_getprop(val, "device_type", type, sizeof(type));
1509 if (strcmp(type, RELOC("display")) == 0)
1510 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1513 static void __init prom_close_stdin(void)
1515 struct prom_t *_prom = &RELOC(prom);
1518 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1519 call_prom("close", 1, 0, val);
1522 static int __init prom_find_machine_type(void)
1524 struct prom_t *_prom = &RELOC(prom);
1532 /* Look for a PowerMac */
1533 len = prom_getprop(_prom->root, "compatible",
1534 compat, sizeof(compat)-1);
1538 char *p = &compat[i];
1542 if (strstr(p, RELOC("Power Macintosh")) ||
1543 strstr(p, RELOC("MacRISC")))
1544 return PLATFORM_POWERMAC;
1546 /* We must make sure we don't detect the IBM Cell
1547 * blades as pSeries due to some firmware issues,
1550 if (strstr(p, RELOC("IBM,CBEA")) ||
1551 strstr(p, RELOC("IBM,CPBW-1.0")))
1552 return PLATFORM_GENERIC;
1553 #endif /* CONFIG_PPC64 */
1558 /* If not a mac, try to figure out if it's an IBM pSeries or any other
1559 * PAPR compliant platform. We assume it is if :
1560 * - /device_type is "chrp" (please, do NOT use that for future
1564 len = prom_getprop(_prom->root, "device_type",
1565 compat, sizeof(compat)-1);
1567 return PLATFORM_GENERIC;
1568 if (strcmp(compat, RELOC("chrp")))
1569 return PLATFORM_GENERIC;
1571 /* Default to pSeries. We need to know if we are running LPAR */
1572 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1573 if (!PHANDLE_VALID(rtas))
1574 return PLATFORM_GENERIC;
1575 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1576 if (x != PROM_ERROR) {
1577 prom_printf("Hypertas detected, assuming LPAR !\n");
1578 return PLATFORM_PSERIES_LPAR;
1580 return PLATFORM_PSERIES;
1582 return PLATFORM_GENERIC;
1586 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1588 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1592 * If we have a display that we don't know how to drive,
1593 * we will want to try to execute OF's open method for it
1594 * later. However, OF will probably fall over if we do that
1595 * we've taken over the MMU.
1596 * So we check whether we will need to open the display,
1597 * and if so, open it now.
1599 static void __init prom_check_displays(void)
1601 char type[16], *path;
1606 static unsigned char default_colors[] = {
1624 const unsigned char *clut;
1626 prom_printf("Looking for displays\n");
1627 for (node = 0; prom_next_node(&node); ) {
1628 memset(type, 0, sizeof(type));
1629 prom_getprop(node, "device_type", type, sizeof(type));
1630 if (strcmp(type, RELOC("display")) != 0)
1633 /* It seems OF doesn't null-terminate the path :-( */
1634 path = RELOC(prom_scratch);
1635 memset(path, 0, PROM_SCRATCH_SIZE);
1638 * leave some room at the end of the path for appending extra
1641 if (call_prom("package-to-path", 3, 1, node, path,
1642 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1644 prom_printf("found display : %s, opening ... ", path);
1646 ih = call_prom("open", 1, 1, path);
1648 prom_printf("failed\n");
1653 prom_printf("done\n");
1654 prom_setprop(node, path, "linux,opened", NULL, 0);
1656 /* Setup a usable color table when the appropriate
1657 * method is available. Should update this to set-colors */
1658 clut = RELOC(default_colors);
1659 for (i = 0; i < 32; i++, clut += 3)
1660 if (prom_set_color(ih, i, clut[0], clut[1],
1664 #ifdef CONFIG_LOGO_LINUX_CLUT224
1665 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1666 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1667 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1670 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1675 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1676 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1677 unsigned long needed, unsigned long align)
1681 *mem_start = _ALIGN(*mem_start, align);
1682 while ((*mem_start + needed) > *mem_end) {
1683 unsigned long room, chunk;
1685 prom_debug("Chunk exhausted, claiming more at %x...\n",
1686 RELOC(alloc_bottom));
1687 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1688 if (room > DEVTREE_CHUNK_SIZE)
1689 room = DEVTREE_CHUNK_SIZE;
1690 if (room < PAGE_SIZE)
1691 prom_panic("No memory for flatten_device_tree (no room)");
1692 chunk = alloc_up(room, 0);
1694 prom_panic("No memory for flatten_device_tree (claim failed)");
1695 *mem_end = RELOC(alloc_top);
1698 ret = (void *)*mem_start;
1699 *mem_start += needed;
1704 #define dt_push_token(token, mem_start, mem_end) \
1705 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1707 static unsigned long __init dt_find_string(char *str)
1711 s = os = (char *)RELOC(dt_string_start);
1713 while (s < (char *)RELOC(dt_string_end)) {
1714 if (strcmp(s, str) == 0)
1722 * The Open Firmware 1275 specification states properties must be 31 bytes or
1723 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1725 #define MAX_PROPERTY_NAME 64
1727 static void __init scan_dt_build_strings(phandle node,
1728 unsigned long *mem_start,
1729 unsigned long *mem_end)
1731 char *prev_name, *namep, *sstart;
1735 sstart = (char *)RELOC(dt_string_start);
1737 /* get and store all property names */
1738 prev_name = RELOC("");
1740 /* 64 is max len of name including nul. */
1741 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
1742 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
1743 /* No more nodes: unwind alloc */
1744 *mem_start = (unsigned long)namep;
1749 if (strcmp(namep, RELOC("name")) == 0) {
1750 *mem_start = (unsigned long)namep;
1751 prev_name = RELOC("name");
1754 /* get/create string entry */
1755 soff = dt_find_string(namep);
1757 *mem_start = (unsigned long)namep;
1758 namep = sstart + soff;
1760 /* Trim off some if we can */
1761 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1762 RELOC(dt_string_end) = *mem_start;
1767 /* do all our children */
1768 child = call_prom("child", 1, 1, node);
1769 while (child != 0) {
1770 scan_dt_build_strings(child, mem_start, mem_end);
1771 child = call_prom("peer", 1, 1, child);
1775 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1776 unsigned long *mem_end)
1779 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
1781 unsigned char *valp;
1782 static char pname[MAX_PROPERTY_NAME];
1785 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1787 /* get the node's full name */
1788 namep = (char *)*mem_start;
1789 room = *mem_end - *mem_start;
1792 l = call_prom("package-to-path", 3, 1, node, namep, room);
1794 /* Didn't fit? Get more room. */
1796 if (l >= *mem_end - *mem_start)
1797 namep = make_room(mem_start, mem_end, l+1, 1);
1798 call_prom("package-to-path", 3, 1, node, namep, l);
1802 /* Fixup an Apple bug where they have bogus \0 chars in the
1803 * middle of the path in some properties, and extract
1804 * the unit name (everything after the last '/').
1806 for (lp = p = namep, ep = namep + l; p < ep; p++) {
1813 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
1816 /* get it again for debugging */
1817 path = RELOC(prom_scratch);
1818 memset(path, 0, PROM_SCRATCH_SIZE);
1819 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1821 /* get and store all properties */
1822 prev_name = RELOC("");
1823 sstart = (char *)RELOC(dt_string_start);
1825 if (call_prom("nextprop", 3, 1, node, prev_name,
1830 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
1831 prev_name = RELOC("name");
1835 /* find string offset */
1836 soff = dt_find_string(RELOC(pname));
1838 prom_printf("WARNING: Can't find string index for"
1839 " <%s>, node %s\n", RELOC(pname), path);
1842 prev_name = sstart + soff;
1845 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
1848 if (l == PROM_ERROR)
1850 if (l > MAX_PROPERTY_LENGTH) {
1851 prom_printf("WARNING: ignoring large property ");
1852 /* It seems OF doesn't null-terminate the path :-( */
1853 prom_printf("[%s] ", path);
1854 prom_printf("%s length 0x%x\n", RELOC(pname), l);
1858 /* push property head */
1859 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1860 dt_push_token(l, mem_start, mem_end);
1861 dt_push_token(soff, mem_start, mem_end);
1863 /* push property content */
1864 valp = make_room(mem_start, mem_end, l, 4);
1865 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
1866 *mem_start = _ALIGN(*mem_start, 4);
1869 /* Add a "linux,phandle" property. */
1870 soff = dt_find_string(RELOC("linux,phandle"));
1872 prom_printf("WARNING: Can't find string index for"
1873 " <linux-phandle> node %s\n", path);
1875 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1876 dt_push_token(4, mem_start, mem_end);
1877 dt_push_token(soff, mem_start, mem_end);
1878 valp = make_room(mem_start, mem_end, 4, 4);
1879 *(u32 *)valp = node;
1882 /* do all our children */
1883 child = call_prom("child", 1, 1, node);
1884 while (child != 0) {
1885 scan_dt_build_struct(child, mem_start, mem_end);
1886 child = call_prom("peer", 1, 1, child);
1889 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
1892 static void __init flatten_device_tree(void)
1895 unsigned long mem_start, mem_end, room;
1896 struct boot_param_header *hdr;
1897 struct prom_t *_prom = &RELOC(prom);
1902 * Check how much room we have between alloc top & bottom (+/- a
1903 * few pages), crop to 4Mb, as this is our "chuck" size
1905 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
1906 if (room > DEVTREE_CHUNK_SIZE)
1907 room = DEVTREE_CHUNK_SIZE;
1908 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
1910 /* Now try to claim that */
1911 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
1913 prom_panic("Can't allocate initial device-tree chunk\n");
1914 mem_end = RELOC(alloc_top);
1916 /* Get root of tree */
1917 root = call_prom("peer", 1, 1, (phandle)0);
1918 if (root == (phandle)0)
1919 prom_panic ("couldn't get device tree root\n");
1921 /* Build header and make room for mem rsv map */
1922 mem_start = _ALIGN(mem_start, 4);
1923 hdr = make_room(&mem_start, &mem_end,
1924 sizeof(struct boot_param_header), 4);
1925 RELOC(dt_header_start) = (unsigned long)hdr;
1926 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
1928 /* Start of strings */
1929 mem_start = PAGE_ALIGN(mem_start);
1930 RELOC(dt_string_start) = mem_start;
1931 mem_start += 4; /* hole */
1933 /* Add "linux,phandle" in there, we'll need it */
1934 namep = make_room(&mem_start, &mem_end, 16, 1);
1935 strcpy(namep, RELOC("linux,phandle"));
1936 mem_start = (unsigned long)namep + strlen(namep) + 1;
1938 /* Build string array */
1939 prom_printf("Building dt strings...\n");
1940 scan_dt_build_strings(root, &mem_start, &mem_end);
1941 RELOC(dt_string_end) = mem_start;
1943 /* Build structure */
1944 mem_start = PAGE_ALIGN(mem_start);
1945 RELOC(dt_struct_start) = mem_start;
1946 prom_printf("Building dt structure...\n");
1947 scan_dt_build_struct(root, &mem_start, &mem_end);
1948 dt_push_token(OF_DT_END, &mem_start, &mem_end);
1949 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
1952 hdr->boot_cpuid_phys = _prom->cpu;
1953 hdr->magic = OF_DT_HEADER;
1954 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
1955 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
1956 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
1957 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
1958 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
1959 hdr->version = OF_DT_VERSION;
1960 /* Version 16 is not backward compatible */
1961 hdr->last_comp_version = 0x10;
1963 /* Copy the reserve map in */
1964 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
1969 prom_printf("reserved memory map:\n");
1970 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
1971 prom_printf(" %x - %x\n",
1972 RELOC(mem_reserve_map)[i].base,
1973 RELOC(mem_reserve_map)[i].size);
1976 /* Bump mem_reserve_cnt to cause further reservations to fail
1977 * since it's too late.
1979 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
1981 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1982 RELOC(dt_string_start), RELOC(dt_string_end));
1983 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1984 RELOC(dt_struct_start), RELOC(dt_struct_end));
1988 #ifdef CONFIG_PPC_MAPLE
1989 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
1990 * The values are bad, and it doesn't even have the right number of cells. */
1991 static void __init fixup_device_tree_maple(void)
1996 isa = call_prom("finddevice", 1, 1, ADDR("/ht@0/isa@4"));
1997 if (!PHANDLE_VALID(isa))
2000 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2004 if (isa_ranges[0] != 0x1 ||
2005 isa_ranges[1] != 0xf4000000 ||
2006 isa_ranges[2] != 0x00010000)
2009 prom_printf("fixing up bogus ISA range on Maple...\n");
2011 isa_ranges[0] = 0x1;
2012 isa_ranges[1] = 0x0;
2013 isa_ranges[2] = 0x01002000; /* IO space; PCI device = 4 */
2014 isa_ranges[3] = 0x0;
2015 isa_ranges[4] = 0x0;
2016 isa_ranges[5] = 0x00010000;
2017 prom_setprop(isa, "/ht@0/isa@4", "ranges",
2018 isa_ranges, sizeof(isa_ranges));
2021 #define fixup_device_tree_maple()
2024 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2025 static void __init fixup_device_tree_pmac(void)
2027 phandle u3, i2c, mpic;
2032 /* Some G5s have a missing interrupt definition, fix it up here */
2033 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2034 if (!PHANDLE_VALID(u3))
2036 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2037 if (!PHANDLE_VALID(i2c))
2039 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2040 if (!PHANDLE_VALID(mpic))
2043 /* check if proper rev of u3 */
2044 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2047 if (u3_rev < 0x35 || u3_rev > 0x39)
2049 /* does it need fixup ? */
2050 if (prom_getproplen(i2c, "interrupts") > 0)
2053 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2055 /* interrupt on this revision of u3 is number 0 and level */
2058 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2059 &interrupts, sizeof(interrupts));
2061 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2062 &parent, sizeof(parent));
2065 #define fixup_device_tree_pmac()
2068 static void __init fixup_device_tree(void)
2070 fixup_device_tree_maple();
2071 fixup_device_tree_pmac();
2074 static void __init prom_find_boot_cpu(void)
2076 struct prom_t *_prom = &RELOC(prom);
2082 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2085 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2087 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2088 _prom->cpu = getprop_rval;
2090 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
2093 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2095 #ifdef CONFIG_BLK_DEV_INITRD
2096 struct prom_t *_prom = &RELOC(prom);
2098 if (r3 && r4 && r4 != 0xdeadbeef) {
2101 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
2102 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
2104 val = RELOC(prom_initrd_start);
2105 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
2107 val = RELOC(prom_initrd_end);
2108 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
2111 reserve_mem(RELOC(prom_initrd_start),
2112 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
2114 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
2115 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
2117 #endif /* CONFIG_BLK_DEV_INITRD */
2121 * We enter here early on, when the Open Firmware prom is still
2122 * handling exceptions and the MMU hash table for us.
2125 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2127 unsigned long r6, unsigned long r7)
2129 struct prom_t *_prom;
2131 unsigned long offset = reloc_offset();
2137 _prom = &RELOC(prom);
2140 * First zero the BSS
2142 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
2145 * Init interface to Open Firmware, get some node references,
2148 prom_init_client_services(pp);
2151 * See if this OF is old enough that we need to do explicit maps
2152 * and other workarounds
2157 * Init prom stdout device
2162 * Get default machine type. At this point, we do not differentiate
2163 * between pSeries SMP and pSeries LPAR
2165 RELOC(of_platform) = prom_find_machine_type();
2167 /* Bail if this is a kdump kernel. */
2168 if (PHYSICAL_START > 0)
2169 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2172 * Check for an initrd
2174 prom_check_initrd(r3, r4);
2176 #ifdef CONFIG_PPC_PSERIES
2178 * On pSeries, inform the firmware about our capabilities
2180 if (RELOC(of_platform) == PLATFORM_PSERIES ||
2181 RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
2182 prom_send_capabilities();
2186 * Copy the CPU hold code
2188 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2189 copy_and_flush(0, KERNELBASE + offset, 0x100, 0);
2192 * Do early parsing of command line
2194 early_cmdline_parse();
2197 * Initialize memory management within prom_init
2202 * Determine which cpu is actually running right _now_
2204 prom_find_boot_cpu();
2207 * Initialize display devices
2209 prom_check_displays();
2213 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2214 * that uses the allocator, we need to make sure we get the top of memory
2215 * available for us here...
2217 if (RELOC(of_platform) == PLATFORM_PSERIES)
2218 prom_initialize_tce_table();
2222 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2223 * in spin-loops. PowerMacs don't have a working RTAS and use
2224 * a different way to spin CPUs
2226 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
2227 prom_instantiate_rtas();
2232 * Fill in some infos for use by the kernel later on
2235 if (RELOC(ppc64_iommu_off))
2236 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
2239 if (RELOC(iommu_force_on))
2240 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
2243 if (RELOC(prom_tce_alloc_start)) {
2244 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
2245 &RELOC(prom_tce_alloc_start),
2246 sizeof(prom_tce_alloc_start));
2247 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
2248 &RELOC(prom_tce_alloc_end),
2249 sizeof(prom_tce_alloc_end));
2254 * Fixup any known bugs in the device-tree
2256 fixup_device_tree();
2259 * Now finally create the flattened device-tree
2261 prom_printf("copying OF device tree ...\n");
2262 flatten_device_tree();
2265 * in case stdin is USB and still active on IBM machines...
2266 * Unfortunately quiesce crashes on some powermacs if we have
2267 * closed stdin already (in particular the powerbook 101).
2269 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2273 * Call OF "quiesce" method to shut down pending DMA's from
2276 prom_printf("Calling quiesce ...\n");
2277 call_prom("quiesce", 0, 0);
2280 * And finally, call the kernel passing it the flattened device
2281 * tree and NULL as r5, thus triggering the new entry point which
2282 * is common to us and kexec
2284 hdr = RELOC(dt_header_start);
2285 prom_printf("returning from prom_init\n");
2286 prom_debug("->dt_header_start=0x%x\n", hdr);
2289 reloc_got2(-offset);
2292 __start(hdr, KERNELBASE + offset, 0);