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/bootinfo.h>
45 #include <asm/btext.h>
46 #include <asm/sections.h>
47 #include <asm/machdep.h>
49 #ifdef CONFIG_LOGO_LINUX_CLUT224
50 #include <linux/linux_logo.h>
51 extern const struct linux_logo logo_linux_clut224;
55 * Properties whose value is longer than this get excluded from our
56 * copy of the device tree. This value does need to be big enough to
57 * ensure that we don't lose things like the interrupt-map property
58 * on a PCI-PCI bridge.
60 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
63 * Eventually bump that one up
65 #define DEVTREE_CHUNK_SIZE 0x100000
68 * This is the size of the local memory reserve map that gets copied
69 * into the boot params passed to the kernel. That size is totally
70 * flexible as the kernel just reads the list until it encounters an
71 * entry with size 0, so it can be changed without breaking binary
74 #define MEM_RESERVE_MAP_SIZE 8
77 * prom_init() is called very early on, before the kernel text
78 * and data have been mapped to KERNELBASE. At this point the code
79 * is running at whatever address it has been loaded at.
80 * On ppc32 we compile with -mrelocatable, which means that references
81 * to extern and static variables get relocated automatically.
82 * On ppc64 we have to relocate the references explicitly with
83 * RELOC. (Note that strings count as static variables.)
85 * Because OF may have mapped I/O devices into the area starting at
86 * KERNELBASE, particularly on CHRP machines, we can't safely call
87 * OF once the kernel has been mapped to KERNELBASE. Therefore all
88 * OF calls must be done within prom_init().
90 * ADDR is used in calls to call_prom. The 4th and following
91 * arguments to call_prom should be 32-bit values.
92 * On ppc64, 64 bit values are truncated to 32 bits (and
93 * fortunately don't get interpreted as two arguments).
96 #define RELOC(x) (*PTRRELOC(&(x)))
97 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
100 #define ADDR(x) (u32) (x)
103 #define PROM_BUG() do { \
104 prom_printf("kernel BUG at %s line 0x%x!\n", \
105 RELOC(__FILE__), __LINE__); \
106 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
110 #define prom_debug(x...) prom_printf(x)
112 #define prom_debug(x...)
116 #define PLATFORM_POWERMAC _MACH_Pmac
117 #define PLATFORM_CHRP _MACH_chrp
121 typedef u32 prom_arg_t;
138 struct mem_map_entry {
145 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5);
148 extern void enter_prom(struct prom_args *args, unsigned long entry);
150 static inline void enter_prom(struct prom_args *args, unsigned long entry)
152 ((void (*)(struct prom_args *))entry)(args);
156 extern void copy_and_flush(unsigned long dest, unsigned long src,
157 unsigned long size, unsigned long offset);
160 static struct prom_t __initdata prom;
162 static unsigned long prom_entry __initdata;
164 #define PROM_SCRATCH_SIZE 256
166 static char __initdata of_stdout_device[256];
167 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
169 static unsigned long __initdata dt_header_start;
170 static unsigned long __initdata dt_struct_start, dt_struct_end;
171 static unsigned long __initdata dt_string_start, dt_string_end;
173 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
176 static int __initdata iommu_force_on;
177 static int __initdata ppc64_iommu_off;
178 static unsigned long __initdata prom_tce_alloc_start;
179 static unsigned long __initdata prom_tce_alloc_end;
182 static int __initdata of_platform;
184 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
186 static unsigned long __initdata prom_memory_limit;
188 static unsigned long __initdata alloc_top;
189 static unsigned long __initdata alloc_top_high;
190 static unsigned long __initdata alloc_bottom;
191 static unsigned long __initdata rmo_top;
192 static unsigned long __initdata ram_top;
194 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
195 static int __initdata mem_reserve_cnt;
197 static cell_t __initdata regbuf[1024];
200 #define MAX_CPU_THREADS 2
206 unsigned int threadid;
207 } hmt_thread_data[NR_CPUS];
208 #endif /* CONFIG_HMT */
211 * Error results ... some OF calls will return "-1" on error, some
212 * will return 0, some will return either. To simplify, here are
213 * macros to use with any ihandle or phandle return value to check if
217 #define PROM_ERROR (-1u)
218 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
219 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
222 /* This is the one and *ONLY* place where we actually call open
226 static int __init call_prom(const char *service, int nargs, int nret, ...)
229 struct prom_args args;
232 args.service = ADDR(service);
236 va_start(list, nret);
237 for (i = 0; i < nargs; i++)
238 args.args[i] = va_arg(list, prom_arg_t);
241 for (i = 0; i < nret; i++)
242 args.args[nargs+i] = 0;
244 enter_prom(&args, RELOC(prom_entry));
246 return (nret > 0) ? args.args[nargs] : 0;
249 static int __init call_prom_ret(const char *service, int nargs, int nret,
250 prom_arg_t *rets, ...)
253 struct prom_args args;
256 args.service = ADDR(service);
260 va_start(list, rets);
261 for (i = 0; i < nargs; i++)
262 args.args[i] = va_arg(list, prom_arg_t);
265 for (i = 0; i < nret; i++)
268 enter_prom(&args, RELOC(prom_entry));
271 for (i = 1; i < nret; ++i)
272 rets[i-1] = args.args[nargs+i];
274 return (nret > 0) ? args.args[nargs] : 0;
278 static void __init prom_print(const char *msg)
281 struct prom_t *_prom = &RELOC(prom);
283 if (_prom->stdout == 0)
286 for (p = msg; *p != 0; p = q) {
287 for (q = p; *q != 0 && *q != '\n'; ++q)
290 call_prom("write", 3, 1, _prom->stdout, p, q - p);
294 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
299 static void __init prom_print_hex(unsigned long val)
301 int i, nibbles = sizeof(val)*2;
302 char buf[sizeof(val)*2+1];
303 struct prom_t *_prom = &RELOC(prom);
305 for (i = nibbles-1; i >= 0; i--) {
306 buf[i] = (val & 0xf) + '0';
308 buf[i] += ('a'-'0'-10);
312 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
316 static void __init prom_printf(const char *format, ...)
318 const char *p, *q, *s;
321 struct prom_t *_prom = &RELOC(prom);
323 va_start(args, format);
325 format = PTRRELOC(format);
327 for (p = format; *p != 0; p = q) {
328 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
331 call_prom("write", 3, 1, _prom->stdout, p, q - p);
336 call_prom("write", 3, 1, _prom->stdout,
346 s = va_arg(args, const char *);
351 v = va_arg(args, unsigned long);
359 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
363 struct prom_t *_prom = &RELOC(prom);
365 ret = call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
367 if (ret != -1 && _prom->mmumap != 0)
368 /* old pmacs need us to map as well */
369 call_prom("call-method", 6, 1,
370 ADDR("map"), _prom->mmumap, 0, size, virt, virt);
374 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
377 reason = PTRRELOC(reason);
380 /* ToDo: should put up an SRC here on p/iSeries */
381 call_prom("exit", 0, 0);
383 for (;;) /* should never get here */
388 static int __init prom_next_node(phandle *nodep)
392 if ((node = *nodep) != 0
393 && (*nodep = call_prom("child", 1, 1, node)) != 0)
395 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
398 if ((node = call_prom("parent", 1, 1, node)) == 0)
400 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
405 static int __init prom_getprop(phandle node, const char *pname,
406 void *value, size_t valuelen)
408 return call_prom("getprop", 4, 1, node, ADDR(pname),
409 (u32)(unsigned long) value, (u32) valuelen);
412 static int __init prom_getproplen(phandle node, const char *pname)
414 return call_prom("getproplen", 2, 1, node, ADDR(pname));
417 static int __init prom_setprop(phandle node, const char *pname,
418 void *value, size_t valuelen)
420 return call_prom("setprop", 4, 1, node, ADDR(pname),
421 (u32)(unsigned long) value, (u32) valuelen);
424 /* We can't use the standard versions because of RELOC headaches. */
425 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
426 || ('a' <= (c) && (c) <= 'f') \
427 || ('A' <= (c) && (c) <= 'F'))
429 #define isdigit(c) ('0' <= (c) && (c) <= '9')
430 #define islower(c) ('a' <= (c) && (c) <= 'z')
431 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
433 unsigned long prom_strtoul(const char *cp, const char **endp)
435 unsigned long result = 0, base = 10, value;
440 if (toupper(*cp) == 'X') {
446 while (isxdigit(*cp) &&
447 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
448 result = result * base + value;
458 unsigned long prom_memparse(const char *ptr, const char **retptr)
460 unsigned long ret = prom_strtoul(ptr, retptr);
464 * We can't use a switch here because GCC *may* generate a
465 * jump table which won't work, because we're not running at
466 * the address we're linked at.
468 if ('G' == **retptr || 'g' == **retptr)
471 if ('M' == **retptr || 'm' == **retptr)
474 if ('K' == **retptr || 'k' == **retptr)
486 * Early parsing of the command line passed to the kernel, used for
487 * "mem=x" and the options that affect the iommu
489 static void __init early_cmdline_parse(void)
491 struct prom_t *_prom = &RELOC(prom);
495 RELOC(prom_cmd_line[0]) = 0;
496 p = RELOC(prom_cmd_line);
497 if ((long)_prom->chosen > 0)
498 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
499 #ifdef CONFIG_CMDLINE
500 if (l == 0) /* dbl check */
501 strlcpy(RELOC(prom_cmd_line),
502 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
503 #endif /* CONFIG_CMDLINE */
504 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
507 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
509 prom_printf("iommu opt is: %s\n", opt);
511 while (*opt && *opt == ' ')
513 if (!strncmp(opt, RELOC("off"), 3))
514 RELOC(ppc64_iommu_off) = 1;
515 else if (!strncmp(opt, RELOC("force"), 5))
516 RELOC(iommu_force_on) = 1;
520 opt = strstr(RELOC(prom_cmd_line), RELOC("mem="));
523 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt);
525 /* Align to 16 MB == size of ppc64 large page */
526 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
531 #ifdef CONFIG_PPC_PSERIES
533 * To tell the firmware what our capabilities are, we have to pass
534 * it a fake 32-bit ELF header containing a couple of PT_NOTE sections
535 * that contain structures that contain the actual values.
537 static struct fake_elf {
544 char name[8]; /* "PowerPC" */
558 char name[24]; /* "IBM,RPA-Client-Config" */
572 .e_ident = { 0x7f, 'E', 'L', 'F',
573 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
574 .e_type = ET_EXEC, /* yeah right */
576 .e_version = EV_CURRENT,
577 .e_phoff = offsetof(struct fake_elf, phdr),
578 .e_phentsize = sizeof(Elf32_Phdr),
584 .p_offset = offsetof(struct fake_elf, chrpnote),
585 .p_filesz = sizeof(struct chrpnote)
588 .p_offset = offsetof(struct fake_elf, rpanote),
589 .p_filesz = sizeof(struct rpanote)
593 .namesz = sizeof("PowerPC"),
594 .descsz = sizeof(struct chrpdesc),
598 .real_mode = ~0U, /* ~0 means "don't care" */
607 .namesz = sizeof("IBM,RPA-Client-Config"),
608 .descsz = sizeof(struct rpadesc),
610 .name = "IBM,RPA-Client-Config",
613 .min_rmo_size = 64, /* in megabytes */
614 .min_rmo_percent = 0,
615 .max_pft_size = 48, /* 2^48 bytes max PFT size */
623 static void __init prom_send_capabilities(void)
627 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
628 if (elfloader == 0) {
629 prom_printf("couldn't open /packages/elf-loader\n");
632 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
633 elfloader, ADDR(&fake_elf));
634 call_prom("close", 1, 0, elfloader);
639 * Memory allocation strategy... our layout is normally:
641 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
642 * rare cases, initrd might end up being before the kernel though.
643 * We assume this won't override the final kernel at 0, we have no
644 * provision to handle that in this version, but it should hopefully
647 * alloc_top is set to the top of RMO, eventually shrink down if the
650 * alloc_bottom is set to the top of kernel/initrd
652 * from there, allocations are done this way : rtas is allocated
653 * topmost, and the device-tree is allocated from the bottom. We try
654 * to grow the device-tree allocation as we progress. If we can't,
655 * then we fail, we don't currently have a facility to restart
656 * elsewhere, but that shouldn't be necessary.
658 * Note that calls to reserve_mem have to be done explicitly, memory
659 * allocated with either alloc_up or alloc_down isn't automatically
665 * Allocates memory in the RMO upward from the kernel/initrd
667 * When align is 0, this is a special case, it means to allocate in place
668 * at the current location of alloc_bottom or fail (that is basically
669 * extending the previous allocation). Used for the device-tree flattening
671 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
673 unsigned long base = _ALIGN_UP(RELOC(alloc_bottom), align);
674 unsigned long addr = 0;
676 prom_debug("alloc_up(%x, %x)\n", size, align);
677 if (RELOC(ram_top) == 0)
678 prom_panic("alloc_up() called with mem not initialized\n");
681 base = _ALIGN_UP(RELOC(alloc_bottom), align);
683 base = RELOC(alloc_bottom);
685 for(; (base + size) <= RELOC(alloc_top);
686 base = _ALIGN_UP(base + 0x100000, align)) {
687 prom_debug(" trying: 0x%x\n\r", base);
688 addr = (unsigned long)prom_claim(base, size, 0);
689 if (addr != PROM_ERROR)
697 RELOC(alloc_bottom) = addr;
699 prom_debug(" -> %x\n", addr);
700 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
701 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
702 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
703 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
704 prom_debug(" ram_top : %x\n", RELOC(ram_top));
710 * Allocates memory downward, either from top of RMO, or if highmem
711 * is set, from the top of RAM. Note that this one doesn't handle
712 * failures. It does claim memory if highmem is not set.
714 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
717 unsigned long base, addr = 0;
719 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
720 highmem ? RELOC("(high)") : RELOC("(low)"));
721 if (RELOC(ram_top) == 0)
722 prom_panic("alloc_down() called with mem not initialized\n");
725 /* Carve out storage for the TCE table. */
726 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
727 if (addr <= RELOC(alloc_bottom))
729 /* Will we bump into the RMO ? If yes, check out that we
730 * didn't overlap existing allocations there, if we did,
731 * we are dead, we must be the first in town !
733 if (addr < RELOC(rmo_top)) {
734 /* Good, we are first */
735 if (RELOC(alloc_top) == RELOC(rmo_top))
736 RELOC(alloc_top) = RELOC(rmo_top) = addr;
740 RELOC(alloc_top_high) = addr;
744 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
745 for (; base > RELOC(alloc_bottom);
746 base = _ALIGN_DOWN(base - 0x100000, align)) {
747 prom_debug(" trying: 0x%x\n\r", base);
748 addr = (unsigned long)prom_claim(base, size, 0);
749 if (addr != PROM_ERROR)
755 RELOC(alloc_top) = addr;
758 prom_debug(" -> %x\n", addr);
759 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
760 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
761 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
762 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
763 prom_debug(" ram_top : %x\n", RELOC(ram_top));
771 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
776 /* Ignore more than 2 cells */
777 while (s > sizeof(unsigned long) / 4) {
793 * Very dumb function for adding to the memory reserve list, but
794 * we don't need anything smarter at this point
796 * XXX Eventually check for collisions. They should NEVER happen.
797 * If problems seem to show up, it would be a good start to track
800 static void reserve_mem(unsigned long base, unsigned long size)
802 unsigned long top = base + size;
803 unsigned long cnt = RELOC(mem_reserve_cnt);
808 /* We need to always keep one empty entry so that we
809 * have our terminator with "size" set to 0 since we are
810 * dumb and just copy this entire array to the boot params
812 base = _ALIGN_DOWN(base, PAGE_SIZE);
813 top = _ALIGN_UP(top, PAGE_SIZE);
816 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
817 prom_panic("Memory reserve map exhausted !\n");
818 RELOC(mem_reserve_map)[cnt].base = base;
819 RELOC(mem_reserve_map)[cnt].size = size;
820 RELOC(mem_reserve_cnt) = cnt + 1;
824 * Initialize memory allocation mecanism, parse "memory" nodes and
825 * obtain that way the top of memory and RMO to setup out local allocator
827 static void __init prom_init_mem(void)
830 char *path, type[64];
833 struct prom_t *_prom = &RELOC(prom);
837 * We iterate the memory nodes to find
838 * 1) top of RMO (first node)
842 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
844 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
845 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
846 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
848 prom_debug("scanning memory:\n");
849 path = RELOC(prom_scratch);
851 for (node = 0; prom_next_node(&node); ) {
853 prom_getprop(node, "device_type", type, sizeof(type));
855 if (strcmp(type, RELOC("memory")))
858 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
859 if (plen > sizeof(regbuf)) {
860 prom_printf("memory node too large for buffer !\n");
861 plen = sizeof(regbuf);
864 endp = p + (plen / sizeof(cell_t));
867 memset(path, 0, PROM_SCRATCH_SIZE);
868 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
869 prom_debug(" node %s :\n", path);
870 #endif /* DEBUG_PROM */
872 while ((endp - p) >= (rac + rsc)) {
873 unsigned long base, size;
875 base = prom_next_cell(rac, &p);
876 size = prom_next_cell(rsc, &p);
880 prom_debug(" %x %x\n", base, size);
882 RELOC(rmo_top) = size;
883 if ((base + size) > RELOC(ram_top))
884 RELOC(ram_top) = base + size;
888 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
890 /* Check if we have an initrd after the kernel, if we do move our bottom
893 if (RELOC(prom_initrd_start)) {
894 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
895 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
899 * If prom_memory_limit is set we reduce the upper limits *except* for
900 * alloc_top_high. This must be the real top of RAM so we can put
904 RELOC(alloc_top_high) = RELOC(ram_top);
906 if (RELOC(prom_memory_limit)) {
907 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) {
908 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
909 RELOC(prom_memory_limit));
910 RELOC(prom_memory_limit) = 0;
911 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) {
912 prom_printf("Ignoring mem=%x >= ram_top.\n",
913 RELOC(prom_memory_limit));
914 RELOC(prom_memory_limit) = 0;
916 RELOC(ram_top) = RELOC(prom_memory_limit);
917 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit));
922 * Setup our top alloc point, that is top of RMO or top of
923 * segment 0 when running non-LPAR.
924 * Some RS64 machines have buggy firmware where claims up at
925 * 1GB fail. Cap at 768MB as a workaround.
926 * Since 768MB is plenty of room, and we need to cap to something
927 * reasonable on 32-bit, cap at 768MB on all machines.
930 RELOC(rmo_top) = RELOC(ram_top);
931 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
932 RELOC(alloc_top) = RELOC(rmo_top);
934 prom_printf("memory layout at init:\n");
935 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));
936 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
937 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
938 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
939 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
940 prom_printf(" ram_top : %x\n", RELOC(ram_top));
945 * Allocate room for and instantiate RTAS
947 static void __init prom_instantiate_rtas(void)
954 prom_debug("prom_instantiate_rtas: start...\n");
956 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
957 prom_debug("rtas_node: %x\n", rtas_node);
958 if (!PHANDLE_VALID(rtas_node))
961 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
965 base = alloc_down(size, PAGE_SIZE, 0);
967 prom_printf("RTAS allocation failed !\n");
971 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
972 if (!IHANDLE_VALID(rtas_inst)) {
973 prom_printf("opening rtas package failed");
977 prom_printf("instantiating rtas at 0x%x ...", base);
979 if (call_prom_ret("call-method", 3, 2, &entry,
980 ADDR("instantiate-rtas"),
981 rtas_inst, base) == PROM_ERROR
983 prom_printf(" failed\n");
986 prom_printf(" done\n");
988 reserve_mem(base, size);
990 prom_setprop(rtas_node, "linux,rtas-base", &base, sizeof(base));
991 prom_setprop(rtas_node, "linux,rtas-entry", &entry, sizeof(entry));
993 prom_debug("rtas base = 0x%x\n", base);
994 prom_debug("rtas entry = 0x%x\n", entry);
995 prom_debug("rtas size = 0x%x\n", (long)size);
997 prom_debug("prom_instantiate_rtas: end...\n");
1002 * Allocate room for and initialize TCE tables
1004 static void __init prom_initialize_tce_table(void)
1008 char compatible[64], type[64], model[64];
1009 char *path = RELOC(prom_scratch);
1011 u32 minalign, minsize;
1012 u64 tce_entry, *tce_entryp;
1013 u64 local_alloc_top, local_alloc_bottom;
1016 if (RELOC(ppc64_iommu_off))
1019 prom_debug("starting prom_initialize_tce_table\n");
1021 /* Cache current top of allocs so we reserve a single block */
1022 local_alloc_top = RELOC(alloc_top_high);
1023 local_alloc_bottom = local_alloc_top;
1025 /* Search all nodes looking for PHBs. */
1026 for (node = 0; prom_next_node(&node); ) {
1030 prom_getprop(node, "compatible",
1031 compatible, sizeof(compatible));
1032 prom_getprop(node, "device_type", type, sizeof(type));
1033 prom_getprop(node, "model", model, sizeof(model));
1035 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1038 /* Keep the old logic in tack to avoid regression. */
1039 if (compatible[0] != 0) {
1040 if ((strstr(compatible, RELOC("python")) == NULL) &&
1041 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1042 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1044 } else if (model[0] != 0) {
1045 if ((strstr(model, RELOC("ython")) == NULL) &&
1046 (strstr(model, RELOC("peedwagon")) == NULL) &&
1047 (strstr(model, RELOC("innipeg")) == NULL))
1051 if (prom_getprop(node, "tce-table-minalign", &minalign,
1052 sizeof(minalign)) == PROM_ERROR)
1054 if (prom_getprop(node, "tce-table-minsize", &minsize,
1055 sizeof(minsize)) == PROM_ERROR)
1056 minsize = 4UL << 20;
1059 * Even though we read what OF wants, we just set the table
1060 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1061 * By doing this, we avoid the pitfalls of trying to DMA to
1062 * MMIO space and the DMA alias hole.
1064 * On POWER4, firmware sets the TCE region by assuming
1065 * each TCE table is 8MB. Using this memory for anything
1066 * else will impact performance, so we always allocate 8MB.
1069 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1070 minsize = 8UL << 20;
1072 minsize = 4UL << 20;
1074 /* Align to the greater of the align or size */
1075 align = max(minalign, minsize);
1076 base = alloc_down(minsize, align, 1);
1078 prom_panic("ERROR, cannot find space for TCE table.\n");
1079 if (base < local_alloc_bottom)
1080 local_alloc_bottom = base;
1082 /* Save away the TCE table attributes for later use. */
1083 prom_setprop(node, "linux,tce-base", &base, sizeof(base));
1084 prom_setprop(node, "linux,tce-size", &minsize, sizeof(minsize));
1086 /* It seems OF doesn't null-terminate the path :-( */
1087 memset(path, 0, sizeof(path));
1088 /* Call OF to setup the TCE hardware */
1089 if (call_prom("package-to-path", 3, 1, node,
1090 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1091 prom_printf("package-to-path failed\n");
1094 prom_debug("TCE table: %s\n", path);
1095 prom_debug("\tnode = 0x%x\n", node);
1096 prom_debug("\tbase = 0x%x\n", base);
1097 prom_debug("\tsize = 0x%x\n", minsize);
1099 /* Initialize the table to have a one-to-one mapping
1100 * over the allocated size.
1102 tce_entryp = (unsigned long *)base;
1103 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1104 tce_entry = (i << PAGE_SHIFT);
1106 *tce_entryp = tce_entry;
1109 prom_printf("opening PHB %s", path);
1110 phb_node = call_prom("open", 1, 1, path);
1112 prom_printf("... failed\n");
1114 prom_printf("... done\n");
1116 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1117 phb_node, -1, minsize,
1118 (u32) base, (u32) (base >> 32));
1119 call_prom("close", 1, 0, phb_node);
1122 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1124 if (RELOC(prom_memory_limit)) {
1126 * We align the start to a 16MB boundary so we can map
1127 * the TCE area using large pages if possible.
1128 * The end should be the top of RAM so no need to align it.
1130 RELOC(prom_tce_alloc_start) = _ALIGN_DOWN(local_alloc_bottom,
1132 RELOC(prom_tce_alloc_end) = local_alloc_top;
1135 /* Flag the first invalid entry */
1136 prom_debug("ending prom_initialize_tce_table\n");
1141 * With CHRP SMP we need to use the OF to start the other processors.
1142 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1143 * so we have to put the processors into a holding pattern controlled
1144 * by the kernel (not OF) before we destroy the OF.
1146 * This uses a chunk of low memory, puts some holding pattern
1147 * code there and sends the other processors off to there until
1148 * smp_boot_cpus tells them to do something. The holding pattern
1149 * checks that address until its cpu # is there, when it is that
1150 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1151 * of setting those values.
1153 * We also use physical address 0x4 here to tell when a cpu
1154 * is in its holding pattern code.
1158 extern void __secondary_hold(void);
1159 extern unsigned long __secondary_hold_spinloop;
1160 extern unsigned long __secondary_hold_acknowledge;
1163 * We want to reference the copy of __secondary_hold_* in the
1164 * 0 - 0x100 address range
1166 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1168 static void __init prom_hold_cpus(void)
1175 unsigned int interrupt_server[MAX_CPU_THREADS];
1176 unsigned int cpu_threads, hw_cpu_num;
1178 struct prom_t *_prom = &RELOC(prom);
1179 unsigned long *spinloop
1180 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1181 unsigned long *acknowledge
1182 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1184 /* __secondary_hold is actually a descriptor, not the text address */
1185 unsigned long secondary_hold
1186 = __pa(*PTRRELOC((unsigned long *)__secondary_hold));
1188 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1191 prom_debug("prom_hold_cpus: start...\n");
1192 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1193 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1194 prom_debug(" 1) acknowledge = 0x%x\n",
1195 (unsigned long)acknowledge);
1196 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1197 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1199 /* Set the common spinloop variable, so all of the secondary cpus
1200 * will block when they are awakened from their OF spinloop.
1201 * This must occur for both SMP and non SMP kernels, since OF will
1202 * be trashed when we move the kernel.
1207 for (i = 0; i < NR_CPUS; i++)
1208 RELOC(hmt_thread_data)[i].pir = 0xdeadbeef;
1211 for (node = 0; prom_next_node(&node); ) {
1213 prom_getprop(node, "device_type", type, sizeof(type));
1214 if (strcmp(type, RELOC("cpu")) != 0)
1217 /* Skip non-configured cpus. */
1218 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1219 if (strcmp(type, RELOC("okay")) != 0)
1223 prom_getprop(node, "reg", ®, sizeof(reg));
1225 prom_debug("\ncpuid = 0x%x\n", cpuid);
1226 prom_debug("cpu hw idx = 0x%x\n", reg);
1228 /* Init the acknowledge var which will be reset by
1229 * the secondary cpu when it awakens from its OF
1232 *acknowledge = (unsigned long)-1;
1234 propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
1236 sizeof(interrupt_server));
1238 /* no property. old hardware has no SMT */
1240 interrupt_server[0] = reg; /* fake it with phys id */
1242 /* We have a threaded processor */
1243 cpu_threads = propsize / sizeof(u32);
1244 if (cpu_threads > MAX_CPU_THREADS) {
1245 prom_printf("SMT: too many threads!\n"
1246 "SMT: found %x, max is %x\n",
1247 cpu_threads, MAX_CPU_THREADS);
1248 cpu_threads = 1; /* ToDo: panic? */
1252 hw_cpu_num = interrupt_server[0];
1253 if (hw_cpu_num != _prom->cpu) {
1254 /* Primary Thread of non-boot cpu */
1255 prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
1256 call_prom("start-cpu", 3, 0, node,
1257 secondary_hold, reg);
1259 for (i = 0; (i < 100000000) &&
1260 (*acknowledge == ((unsigned long)-1)); i++ )
1263 if (*acknowledge == reg)
1264 prom_printf("done\n");
1266 prom_printf("failed: %x\n", *acknowledge);
1270 prom_printf("%x : boot cpu %x\n", cpuid, reg);
1271 #endif /* CONFIG_SMP */
1273 /* Reserve cpu #s for secondary threads. They start later. */
1274 cpuid += cpu_threads;
1277 /* Only enable HMT on processors that provide support. */
1278 if (__is_processor(PV_PULSAR) ||
1279 __is_processor(PV_ICESTAR) ||
1280 __is_processor(PV_SSTAR)) {
1281 prom_printf(" starting secondary threads\n");
1283 for (i = 0; i < NR_CPUS; i += 2) {
1288 unsigned long pir = mfspr(SPRN_PIR);
1289 if (__is_processor(PV_PULSAR)) {
1290 RELOC(hmt_thread_data)[i].pir =
1293 RELOC(hmt_thread_data)[i].pir =
1299 prom_printf("Processor is not HMT capable\n");
1303 if (cpuid > NR_CPUS)
1304 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
1305 ") exceeded: ignoring extras\n");
1307 prom_debug("prom_hold_cpus: end...\n");
1311 static void __init prom_init_client_services(unsigned long pp)
1313 struct prom_t *_prom = &RELOC(prom);
1315 /* Get a handle to the prom entry point before anything else */
1316 RELOC(prom_entry) = pp;
1318 /* get a handle for the stdout device */
1319 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1320 if (!PHANDLE_VALID(_prom->chosen))
1321 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1323 /* get device tree root */
1324 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1325 if (!PHANDLE_VALID(_prom->root))
1326 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1333 * For really old powermacs, we need to map things we claim.
1334 * For that, we need the ihandle of the mmu.
1336 static void __init prom_find_mmu(void)
1338 struct prom_t *_prom = &RELOC(prom);
1342 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1343 if (!PHANDLE_VALID(oprom))
1345 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1347 version[sizeof(version) - 1] = 0;
1348 prom_printf("OF version is '%s'\n", version);
1349 /* XXX might need to add other versions here */
1350 if (strcmp(version, "Open Firmware, 1.0.5") != 0)
1352 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1353 sizeof(_prom->mmumap));
1356 #define prom_find_mmu()
1359 static void __init prom_init_stdout(void)
1361 struct prom_t *_prom = &RELOC(prom);
1362 char *path = RELOC(of_stdout_device);
1366 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1367 prom_panic("cannot find stdout");
1369 _prom->stdout = val;
1371 /* Get the full OF pathname of the stdout device */
1372 memset(path, 0, 256);
1373 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1374 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1375 prom_setprop(_prom->chosen, "linux,stdout-package", &val, sizeof(val));
1376 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1377 prom_setprop(_prom->chosen, "linux,stdout-path",
1378 RELOC(of_stdout_device), strlen(RELOC(of_stdout_device))+1);
1380 /* If it's a display, note it */
1381 memset(type, 0, sizeof(type));
1382 prom_getprop(val, "device_type", type, sizeof(type));
1383 if (strcmp(type, RELOC("display")) == 0)
1384 prom_setprop(val, "linux,boot-display", NULL, 0);
1387 static void __init prom_close_stdin(void)
1389 struct prom_t *_prom = &RELOC(prom);
1392 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1393 call_prom("close", 1, 0, val);
1396 static int __init prom_find_machine_type(void)
1398 struct prom_t *_prom = &RELOC(prom);
1403 len = prom_getprop(_prom->root, "compatible",
1404 compat, sizeof(compat)-1);
1408 char *p = &compat[i];
1412 if (strstr(p, RELOC("Power Macintosh")) ||
1413 strstr(p, RELOC("MacRISC")))
1414 return PLATFORM_POWERMAC;
1416 if (strstr(p, RELOC("Momentum,Maple")))
1417 return PLATFORM_MAPLE;
1423 /* Default to pSeries. We need to know if we are running LPAR */
1424 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1425 if (PHANDLE_VALID(rtas)) {
1426 int x = prom_getproplen(rtas, "ibm,hypertas-functions");
1427 if (x != PROM_ERROR) {
1428 prom_printf("Hypertas detected, assuming LPAR !\n");
1429 return PLATFORM_PSERIES_LPAR;
1432 return PLATFORM_PSERIES;
1434 return PLATFORM_CHRP;
1438 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1440 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1444 * If we have a display that we don't know how to drive,
1445 * we will want to try to execute OF's open method for it
1446 * later. However, OF will probably fall over if we do that
1447 * we've taken over the MMU.
1448 * So we check whether we will need to open the display,
1449 * and if so, open it now.
1451 static void __init prom_check_displays(void)
1453 char type[16], *path;
1458 static unsigned char default_colors[] = {
1476 const unsigned char *clut;
1478 prom_printf("Looking for displays\n");
1479 for (node = 0; prom_next_node(&node); ) {
1480 memset(type, 0, sizeof(type));
1481 prom_getprop(node, "device_type", type, sizeof(type));
1482 if (strcmp(type, RELOC("display")) != 0)
1485 /* It seems OF doesn't null-terminate the path :-( */
1486 path = RELOC(prom_scratch);
1487 memset(path, 0, PROM_SCRATCH_SIZE);
1490 * leave some room at the end of the path for appending extra
1493 if (call_prom("package-to-path", 3, 1, node, path,
1494 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1496 prom_printf("found display : %s, opening ... ", path);
1498 ih = call_prom("open", 1, 1, path);
1500 prom_printf("failed\n");
1505 prom_printf("done\n");
1506 prom_setprop(node, "linux,opened", NULL, 0);
1508 /* Setup a usable color table when the appropriate
1509 * method is available. Should update this to set-colors */
1510 clut = RELOC(default_colors);
1511 for (i = 0; i < 32; i++, clut += 3)
1512 if (prom_set_color(ih, i, clut[0], clut[1],
1516 #ifdef CONFIG_LOGO_LINUX_CLUT224
1517 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1518 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1519 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1522 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1527 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1528 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1529 unsigned long needed, unsigned long align)
1533 *mem_start = _ALIGN(*mem_start, align);
1534 while ((*mem_start + needed) > *mem_end) {
1535 unsigned long room, chunk;
1537 prom_debug("Chunk exhausted, claiming more at %x...\n",
1538 RELOC(alloc_bottom));
1539 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1540 if (room > DEVTREE_CHUNK_SIZE)
1541 room = DEVTREE_CHUNK_SIZE;
1542 if (room < PAGE_SIZE)
1543 prom_panic("No memory for flatten_device_tree (no room)");
1544 chunk = alloc_up(room, 0);
1546 prom_panic("No memory for flatten_device_tree (claim failed)");
1547 *mem_end = RELOC(alloc_top);
1550 ret = (void *)*mem_start;
1551 *mem_start += needed;
1556 #define dt_push_token(token, mem_start, mem_end) \
1557 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1559 static unsigned long __init dt_find_string(char *str)
1563 s = os = (char *)RELOC(dt_string_start);
1565 while (s < (char *)RELOC(dt_string_end)) {
1566 if (strcmp(s, str) == 0)
1574 * The Open Firmware 1275 specification states properties must be 31 bytes or
1575 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1577 #define MAX_PROPERTY_NAME 64
1579 static void __init scan_dt_build_strings(phandle node,
1580 unsigned long *mem_start,
1581 unsigned long *mem_end)
1583 char *prev_name, *namep, *sstart;
1587 sstart = (char *)RELOC(dt_string_start);
1589 /* get and store all property names */
1590 prev_name = RELOC("");
1592 /* 64 is max len of name including nul. */
1593 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
1594 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
1595 /* No more nodes: unwind alloc */
1596 *mem_start = (unsigned long)namep;
1601 if (strcmp(namep, RELOC("name")) == 0) {
1602 *mem_start = (unsigned long)namep;
1603 prev_name = RELOC("name");
1606 /* get/create string entry */
1607 soff = dt_find_string(namep);
1609 *mem_start = (unsigned long)namep;
1610 namep = sstart + soff;
1612 /* Trim off some if we can */
1613 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1614 RELOC(dt_string_end) = *mem_start;
1619 /* do all our children */
1620 child = call_prom("child", 1, 1, node);
1621 while (child != 0) {
1622 scan_dt_build_strings(child, mem_start, mem_end);
1623 child = call_prom("peer", 1, 1, child);
1627 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1628 unsigned long *mem_end)
1631 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
1633 unsigned char *valp;
1634 static char pname[MAX_PROPERTY_NAME];
1637 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1639 /* get the node's full name */
1640 namep = (char *)*mem_start;
1641 l = call_prom("package-to-path", 3, 1, node,
1642 namep, *mem_end - *mem_start);
1644 /* Didn't fit? Get more room. */
1645 if ((l+1) > (*mem_end - *mem_start)) {
1646 namep = make_room(mem_start, mem_end, l+1, 1);
1647 call_prom("package-to-path", 3, 1, node, namep, l);
1651 /* Fixup an Apple bug where they have bogus \0 chars in the
1652 * middle of the path in some properties, and extract
1653 * the unit name (everything after the last '/').
1655 for (lp = p = namep, ep = namep + l; p < ep; p++) {
1662 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
1665 /* get it again for debugging */
1666 path = RELOC(prom_scratch);
1667 memset(path, 0, PROM_SCRATCH_SIZE);
1668 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1670 /* get and store all properties */
1671 prev_name = RELOC("");
1672 sstart = (char *)RELOC(dt_string_start);
1674 if (call_prom("nextprop", 3, 1, node, prev_name,
1679 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
1680 prev_name = RELOC("name");
1684 /* find string offset */
1685 soff = dt_find_string(RELOC(pname));
1687 prom_printf("WARNING: Can't find string index for"
1688 " <%s>, node %s\n", RELOC(pname), path);
1691 prev_name = sstart + soff;
1694 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
1697 if (l == PROM_ERROR)
1699 if (l > MAX_PROPERTY_LENGTH) {
1700 prom_printf("WARNING: ignoring large property ");
1701 /* It seems OF doesn't null-terminate the path :-( */
1702 prom_printf("[%s] ", path);
1703 prom_printf("%s length 0x%x\n", RELOC(pname), l);
1707 /* push property head */
1708 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1709 dt_push_token(l, mem_start, mem_end);
1710 dt_push_token(soff, mem_start, mem_end);
1712 /* push property content */
1713 valp = make_room(mem_start, mem_end, l, 4);
1714 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
1715 *mem_start = _ALIGN(*mem_start, 4);
1718 /* Add a "linux,phandle" property. */
1719 soff = dt_find_string(RELOC("linux,phandle"));
1721 prom_printf("WARNING: Can't find string index for"
1722 " <linux-phandle> node %s\n", path);
1724 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1725 dt_push_token(4, mem_start, mem_end);
1726 dt_push_token(soff, mem_start, mem_end);
1727 valp = make_room(mem_start, mem_end, 4, 4);
1728 *(u32 *)valp = node;
1731 /* do all our children */
1732 child = call_prom("child", 1, 1, node);
1733 while (child != 0) {
1734 scan_dt_build_struct(child, mem_start, mem_end);
1735 child = call_prom("peer", 1, 1, child);
1738 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
1741 static void __init flatten_device_tree(void)
1744 unsigned long mem_start, mem_end, room;
1745 struct boot_param_header *hdr;
1746 struct prom_t *_prom = &RELOC(prom);
1751 * Check how much room we have between alloc top & bottom (+/- a
1752 * few pages), crop to 4Mb, as this is our "chuck" size
1754 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
1755 if (room > DEVTREE_CHUNK_SIZE)
1756 room = DEVTREE_CHUNK_SIZE;
1757 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
1759 /* Now try to claim that */
1760 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
1762 prom_panic("Can't allocate initial device-tree chunk\n");
1763 mem_end = RELOC(alloc_top);
1765 /* Get root of tree */
1766 root = call_prom("peer", 1, 1, (phandle)0);
1767 if (root == (phandle)0)
1768 prom_panic ("couldn't get device tree root\n");
1770 /* Build header and make room for mem rsv map */
1771 mem_start = _ALIGN(mem_start, 4);
1772 hdr = make_room(&mem_start, &mem_end,
1773 sizeof(struct boot_param_header), 4);
1774 RELOC(dt_header_start) = (unsigned long)hdr;
1775 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
1777 /* Start of strings */
1778 mem_start = PAGE_ALIGN(mem_start);
1779 RELOC(dt_string_start) = mem_start;
1780 mem_start += 4; /* hole */
1782 /* Add "linux,phandle" in there, we'll need it */
1783 namep = make_room(&mem_start, &mem_end, 16, 1);
1784 strcpy(namep, RELOC("linux,phandle"));
1785 mem_start = (unsigned long)namep + strlen(namep) + 1;
1787 /* Build string array */
1788 prom_printf("Building dt strings...\n");
1789 scan_dt_build_strings(root, &mem_start, &mem_end);
1790 RELOC(dt_string_end) = mem_start;
1792 /* Build structure */
1793 mem_start = PAGE_ALIGN(mem_start);
1794 RELOC(dt_struct_start) = mem_start;
1795 prom_printf("Building dt structure...\n");
1796 scan_dt_build_struct(root, &mem_start, &mem_end);
1797 dt_push_token(OF_DT_END, &mem_start, &mem_end);
1798 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
1801 hdr->boot_cpuid_phys = _prom->cpu;
1802 hdr->magic = OF_DT_HEADER;
1803 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
1804 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
1805 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
1806 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
1807 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
1808 hdr->version = OF_DT_VERSION;
1809 /* Version 16 is not backward compatible */
1810 hdr->last_comp_version = 0x10;
1812 /* Reserve the whole thing and copy the reserve map in, we
1813 * also bump mem_reserve_cnt to cause further reservations to
1814 * fail since it's too late.
1816 reserve_mem(RELOC(dt_header_start), hdr->totalsize);
1817 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
1822 prom_printf("reserved memory map:\n");
1823 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
1824 prom_printf(" %x - %x\n",
1825 RELOC(mem_reserve_map)[i].base,
1826 RELOC(mem_reserve_map)[i].size);
1829 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
1831 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1832 RELOC(dt_string_start), RELOC(dt_string_end));
1833 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1834 RELOC(dt_struct_start), RELOC(dt_struct_end));
1839 static void __init fixup_device_tree(void)
1841 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
1842 phandle u3, i2c, mpic;
1847 /* Some G5s have a missing interrupt definition, fix it up here */
1848 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
1849 if (!PHANDLE_VALID(u3))
1851 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
1852 if (!PHANDLE_VALID(i2c))
1854 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
1855 if (!PHANDLE_VALID(mpic))
1858 /* check if proper rev of u3 */
1859 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
1862 if (u3_rev != 0x35 && u3_rev != 0x37)
1864 /* does it need fixup ? */
1865 if (prom_getproplen(i2c, "interrupts") > 0)
1868 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
1870 /* interrupt on this revision of u3 is number 0 and level */
1873 prom_setprop(i2c, "interrupts", &interrupts, sizeof(interrupts));
1875 prom_setprop(i2c, "interrupt-parent", &parent, sizeof(parent));
1880 static void __init prom_find_boot_cpu(void)
1882 struct prom_t *_prom = &RELOC(prom);
1888 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
1891 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
1893 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
1894 _prom->cpu = getprop_rval;
1896 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
1899 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
1901 #ifdef CONFIG_BLK_DEV_INITRD
1902 struct prom_t *_prom = &RELOC(prom);
1904 if (r3 && r4 && r4 != 0xdeadbeef) {
1907 RELOC(prom_initrd_start) = (r3 >= KERNELBASE) ? __pa(r3) : r3;
1908 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
1910 val = RELOC(prom_initrd_start);
1911 prom_setprop(_prom->chosen, "linux,initrd-start", &val,
1913 val = RELOC(prom_initrd_end);
1914 prom_setprop(_prom->chosen, "linux,initrd-end", &val,
1917 reserve_mem(RELOC(prom_initrd_start),
1918 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
1920 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
1921 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
1923 #endif /* CONFIG_BLK_DEV_INITRD */
1927 * We enter here early on, when the Open Firmware prom is still
1928 * handling exceptions and the MMU hash table for us.
1931 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
1933 unsigned long r6, unsigned long r7)
1935 struct prom_t *_prom;
1938 unsigned long offset = reloc_offset();
1944 _prom = &RELOC(prom);
1947 * First zero the BSS
1949 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
1952 * Init interface to Open Firmware, get some node references,
1955 prom_init_client_services(pp);
1958 * Init prom stdout device
1963 * See if this OF is old enough that we need to do explicit maps
1968 * Check for an initrd
1970 prom_check_initrd(r3, r4);
1973 * Get default machine type. At this point, we do not differentiate
1974 * between pSeries SMP and pSeries LPAR
1976 RELOC(of_platform) = prom_find_machine_type();
1977 getprop_rval = RELOC(of_platform);
1978 prom_setprop(_prom->chosen, "linux,platform",
1979 &getprop_rval, sizeof(getprop_rval));
1981 #ifdef CONFIG_PPC_PSERIES
1983 * On pSeries, inform the firmware about our capabilities
1985 if (RELOC(of_platform) & PLATFORM_PSERIES)
1986 prom_send_capabilities();
1990 * On pSeries and BPA, copy the CPU hold code
1992 if (RELOC(of_platform) != PLATFORM_POWERMAC)
1993 copy_and_flush(0, KERNELBASE + offset, 0x100, 0);
1996 * Do early parsing of command line
1998 early_cmdline_parse();
2001 * Initialize memory management within prom_init
2006 * Determine which cpu is actually running right _now_
2008 prom_find_boot_cpu();
2011 * Initialize display devices
2013 prom_check_displays();
2017 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2018 * that uses the allocator, we need to make sure we get the top of memory
2019 * available for us here...
2021 if (RELOC(of_platform) == PLATFORM_PSERIES)
2022 prom_initialize_tce_table();
2026 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2027 * in spin-loops. PowerMacs don't have a working RTAS and use
2028 * a different way to spin CPUs
2030 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
2031 prom_instantiate_rtas();
2036 * Fill in some infos for use by the kernel later on
2038 if (RELOC(prom_memory_limit))
2039 prom_setprop(_prom->chosen, "linux,memory-limit",
2040 &RELOC(prom_memory_limit),
2041 sizeof(prom_memory_limit));
2043 if (RELOC(ppc64_iommu_off))
2044 prom_setprop(_prom->chosen, "linux,iommu-off", NULL, 0);
2046 if (RELOC(iommu_force_on))
2047 prom_setprop(_prom->chosen, "linux,iommu-force-on", NULL, 0);
2049 if (RELOC(prom_tce_alloc_start)) {
2050 prom_setprop(_prom->chosen, "linux,tce-alloc-start",
2051 &RELOC(prom_tce_alloc_start),
2052 sizeof(prom_tce_alloc_start));
2053 prom_setprop(_prom->chosen, "linux,tce-alloc-end",
2054 &RELOC(prom_tce_alloc_end),
2055 sizeof(prom_tce_alloc_end));
2060 * Fixup any known bugs in the device-tree
2062 fixup_device_tree();
2065 * Now finally create the flattened device-tree
2067 prom_printf("copying OF device tree ...\n");
2068 flatten_device_tree();
2070 /* in case stdin is USB and still active on IBM machines... */
2074 * Call OF "quiesce" method to shut down pending DMA's from
2077 prom_printf("Calling quiesce ...\n");
2078 call_prom("quiesce", 0, 0);
2081 * And finally, call the kernel passing it the flattened device
2082 * tree and NULL as r5, thus triggering the new entry point which
2083 * is common to us and kexec
2085 hdr = RELOC(dt_header_start);
2086 prom_printf("returning from prom_init\n");
2087 prom_debug("->dt_header_start=0x%x\n", hdr);
2090 reloc_got2(-offset);
2093 __start(hdr, KERNELBASE + offset, 0);