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/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/proc_fs.h>
27 #include <linux/stringify.h>
28 #include <linux/delay.h>
29 #include <linux/initrd.h>
30 #include <linux/bitops.h>
34 #include <asm/processor.h>
38 #include <asm/system.h>
40 #include <asm/pgtable.h>
42 #include <asm/iommu.h>
43 #include <asm/btext.h>
44 #include <asm/sections.h>
45 #include <asm/machdep.h>
47 #ifdef CONFIG_LOGO_LINUX_CLUT224
48 #include <linux/linux_logo.h>
49 extern const struct linux_logo logo_linux_clut224;
53 * Properties whose value is longer than this get excluded from our
54 * copy of the device tree. This value does need to be big enough to
55 * ensure that we don't lose things like the interrupt-map property
56 * on a PCI-PCI bridge.
58 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
61 * Eventually bump that one up
63 #define DEVTREE_CHUNK_SIZE 0x100000
66 * This is the size of the local memory reserve map that gets copied
67 * into the boot params passed to the kernel. That size is totally
68 * flexible as the kernel just reads the list until it encounters an
69 * entry with size 0, so it can be changed without breaking binary
72 #define MEM_RESERVE_MAP_SIZE 8
75 * prom_init() is called very early on, before the kernel text
76 * and data have been mapped to KERNELBASE. At this point the code
77 * is running at whatever address it has been loaded at.
78 * On ppc32 we compile with -mrelocatable, which means that references
79 * to extern and static variables get relocated automatically.
80 * On ppc64 we have to relocate the references explicitly with
81 * RELOC. (Note that strings count as static variables.)
83 * Because OF may have mapped I/O devices into the area starting at
84 * KERNELBASE, particularly on CHRP machines, we can't safely call
85 * OF once the kernel has been mapped to KERNELBASE. Therefore all
86 * OF calls must be done within prom_init().
88 * ADDR is used in calls to call_prom. The 4th and following
89 * arguments to call_prom should be 32-bit values.
90 * On ppc64, 64 bit values are truncated to 32 bits (and
91 * fortunately don't get interpreted as two arguments).
94 #define RELOC(x) (*PTRRELOC(&(x)))
95 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
96 #define OF_WORKAROUNDS 0
99 #define ADDR(x) (u32) (x)
100 #define OF_WORKAROUNDS of_workarounds
104 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
105 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
107 #define PROM_BUG() do { \
108 prom_printf("kernel BUG at %s line 0x%x!\n", \
109 RELOC(__FILE__), __LINE__); \
110 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
114 #define prom_debug(x...) prom_printf(x)
116 #define prom_debug(x...)
120 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 int enter_prom(struct prom_args *args, unsigned long entry);
150 static inline int enter_prom(struct prom_args *args, unsigned long entry)
152 return ((int (*)(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 /* Platforms codes are now obsolete in the kernel. Now only used within this
183 * file and ultimately gone too. Feel free to change them if you need, they
184 * are not shared with anything outside of this file anymore
186 #define PLATFORM_PSERIES 0x0100
187 #define PLATFORM_PSERIES_LPAR 0x0101
188 #define PLATFORM_LPAR 0x0001
189 #define PLATFORM_POWERMAC 0x0400
190 #define PLATFORM_GENERIC 0x0500
192 static int __initdata of_platform;
194 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
196 static unsigned long __initdata alloc_top;
197 static unsigned long __initdata alloc_top_high;
198 static unsigned long __initdata alloc_bottom;
199 static unsigned long __initdata rmo_top;
200 static unsigned long __initdata ram_top;
202 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
203 static int __initdata mem_reserve_cnt;
205 static cell_t __initdata regbuf[1024];
208 #define MAX_CPU_THREADS 2
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 if (enter_prom(&args, RELOC(prom_entry)) < 0)
247 return (nret > 0) ? args.args[nargs] : 0;
250 static int __init call_prom_ret(const char *service, int nargs, int nret,
251 prom_arg_t *rets, ...)
254 struct prom_args args;
257 args.service = ADDR(service);
261 va_start(list, rets);
262 for (i = 0; i < nargs; i++)
263 args.args[i] = va_arg(list, prom_arg_t);
266 for (i = 0; i < nret; i++)
267 args.args[nargs+i] = 0;
269 if (enter_prom(&args, RELOC(prom_entry)) < 0)
273 for (i = 1; i < nret; ++i)
274 rets[i-1] = args.args[nargs+i];
276 return (nret > 0) ? args.args[nargs] : 0;
280 static void __init prom_print(const char *msg)
283 struct prom_t *_prom = &RELOC(prom);
285 if (_prom->stdout == 0)
288 for (p = msg; *p != 0; p = q) {
289 for (q = p; *q != 0 && *q != '\n'; ++q)
292 call_prom("write", 3, 1, _prom->stdout, p, q - p);
296 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
301 static void __init prom_print_hex(unsigned long val)
303 int i, nibbles = sizeof(val)*2;
304 char buf[sizeof(val)*2+1];
305 struct prom_t *_prom = &RELOC(prom);
307 for (i = nibbles-1; i >= 0; i--) {
308 buf[i] = (val & 0xf) + '0';
310 buf[i] += ('a'-'0'-10);
314 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
318 static void __init prom_printf(const char *format, ...)
320 const char *p, *q, *s;
323 struct prom_t *_prom = &RELOC(prom);
325 va_start(args, format);
327 format = PTRRELOC(format);
329 for (p = format; *p != 0; p = q) {
330 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
333 call_prom("write", 3, 1, _prom->stdout, p, q - p);
338 call_prom("write", 3, 1, _prom->stdout,
348 s = va_arg(args, const char *);
353 v = va_arg(args, unsigned long);
361 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
364 struct prom_t *_prom = &RELOC(prom);
366 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
368 * Old OF requires we claim physical and virtual separately
369 * and then map explicitly (assuming virtual mode)
374 ret = call_prom_ret("call-method", 5, 2, &result,
375 ADDR("claim"), _prom->memory,
377 if (ret != 0 || result == -1)
379 ret = call_prom_ret("call-method", 5, 2, &result,
380 ADDR("claim"), _prom->mmumap,
383 call_prom("call-method", 4, 1, ADDR("release"),
384 _prom->memory, size, virt);
387 /* the 0x12 is M (coherence) + PP == read/write */
388 call_prom("call-method", 6, 1,
389 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
392 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
396 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
399 reason = PTRRELOC(reason);
402 /* Do not call exit because it clears the screen on pmac
403 * it also causes some sort of double-fault on early pmacs */
404 if (RELOC(of_platform) == PLATFORM_POWERMAC)
407 /* ToDo: should put up an SRC here on p/iSeries */
408 call_prom("exit", 0, 0);
410 for (;;) /* should never get here */
415 static int __init prom_next_node(phandle *nodep)
419 if ((node = *nodep) != 0
420 && (*nodep = call_prom("child", 1, 1, node)) != 0)
422 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
425 if ((node = call_prom("parent", 1, 1, node)) == 0)
427 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
432 static int inline prom_getprop(phandle node, const char *pname,
433 void *value, size_t valuelen)
435 return call_prom("getprop", 4, 1, node, ADDR(pname),
436 (u32)(unsigned long) value, (u32) valuelen);
439 static int inline prom_getproplen(phandle node, const char *pname)
441 return call_prom("getproplen", 2, 1, node, ADDR(pname));
444 static void add_string(char **str, const char *q)
454 static char *tohex(unsigned int x)
456 static char digits[] = "0123456789abcdef";
457 static char result[9];
464 result[i] = digits[x & 0xf];
466 } while (x != 0 && i > 0);
470 static int __init prom_setprop(phandle node, const char *nodename,
471 const char *pname, void *value, size_t valuelen)
475 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
476 return call_prom("setprop", 4, 1, node, ADDR(pname),
477 (u32)(unsigned long) value, (u32) valuelen);
479 /* gah... setprop doesn't work on longtrail, have to use interpret */
481 add_string(&p, "dev");
482 add_string(&p, nodename);
483 add_string(&p, tohex((u32)(unsigned long) value));
484 add_string(&p, tohex(valuelen));
485 add_string(&p, tohex(ADDR(pname)));
486 add_string(&p, tohex(strlen(RELOC(pname))));
487 add_string(&p, "property");
489 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
492 /* We can't use the standard versions because of RELOC headaches. */
493 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
494 || ('a' <= (c) && (c) <= 'f') \
495 || ('A' <= (c) && (c) <= 'F'))
497 #define isdigit(c) ('0' <= (c) && (c) <= '9')
498 #define islower(c) ('a' <= (c) && (c) <= 'z')
499 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
501 unsigned long prom_strtoul(const char *cp, const char **endp)
503 unsigned long result = 0, base = 10, value;
508 if (toupper(*cp) == 'X') {
514 while (isxdigit(*cp) &&
515 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
516 result = result * base + value;
526 unsigned long prom_memparse(const char *ptr, const char **retptr)
528 unsigned long ret = prom_strtoul(ptr, retptr);
532 * We can't use a switch here because GCC *may* generate a
533 * jump table which won't work, because we're not running at
534 * the address we're linked at.
536 if ('G' == **retptr || 'g' == **retptr)
539 if ('M' == **retptr || 'm' == **retptr)
542 if ('K' == **retptr || 'k' == **retptr)
554 * Early parsing of the command line passed to the kernel, used for
555 * "mem=x" and the options that affect the iommu
557 static void __init early_cmdline_parse(void)
559 struct prom_t *_prom = &RELOC(prom);
564 RELOC(prom_cmd_line[0]) = 0;
565 p = RELOC(prom_cmd_line);
566 if ((long)_prom->chosen > 0)
567 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
568 #ifdef CONFIG_CMDLINE
569 if (l <= 0 || p[0] == '\0') /* dbl check */
570 strlcpy(RELOC(prom_cmd_line),
571 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
572 #endif /* CONFIG_CMDLINE */
573 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
576 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
578 prom_printf("iommu opt is: %s\n", opt);
580 while (*opt && *opt == ' ')
582 if (!strncmp(opt, RELOC("off"), 3))
583 RELOC(ppc64_iommu_off) = 1;
584 else if (!strncmp(opt, RELOC("force"), 5))
585 RELOC(iommu_force_on) = 1;
590 #ifdef CONFIG_PPC_PSERIES
592 * There are two methods for telling firmware what our capabilities are.
593 * Newer machines have an "ibm,client-architecture-support" method on the
594 * root node. For older machines, we have to call the "process-elf-header"
595 * method in the /packages/elf-loader node, passing it a fake 32-bit
596 * ELF header containing a couple of PT_NOTE sections that contain
597 * structures that contain various information.
601 * New method - extensible architecture description vector.
603 * Because the description vector contains a mix of byte and word
604 * values, we declare it as an unsigned char array, and use this
605 * macro to put word values in.
607 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
608 ((x) >> 8) & 0xff, (x) & 0xff
610 /* Option vector bits - generic bits in byte 1 */
611 #define OV_IGNORE 0x80 /* ignore this vector */
612 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
614 /* Option vector 1: processor architectures supported */
615 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
616 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
617 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
618 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
619 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
620 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
622 /* Option vector 2: Open Firmware options supported */
623 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
625 /* Option vector 3: processor options supported */
626 #define OV3_FP 0x80 /* floating point */
627 #define OV3_VMX 0x40 /* VMX/Altivec */
629 /* Option vector 5: PAPR/OF options supported */
630 #define OV5_LPAR 0x80 /* logical partitioning supported */
631 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
632 /* ibm,dynamic-reconfiguration-memory property supported */
633 #define OV5_DRCONF_MEMORY 0x20
634 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
637 * The architecture vector has an array of PVR mask/value pairs,
638 * followed by # option vectors - 1, followed by the option vectors.
640 static unsigned char ibm_architecture_vec[] = {
641 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
642 W(0xffff0000), W(0x003e0000), /* POWER6 */
643 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
644 5 - 1, /* 5 option vectors */
646 /* option vector 1: processor architectures supported */
648 0, /* don't ignore, don't halt */
649 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
650 OV1_PPC_2_04 | OV1_PPC_2_05,
652 /* option vector 2: Open Firmware options supported */
656 W(0xffffffff), /* real_base */
657 W(0xffffffff), /* real_size */
658 W(0xffffffff), /* virt_base */
659 W(0xffffffff), /* virt_size */
660 W(0xffffffff), /* load_base */
661 W(64), /* 128MB min RMA */
662 W(0xffffffff), /* full client load */
663 0, /* min RMA percentage of total RAM */
664 48, /* max log_2(hash table size) */
666 /* option vector 3: processor options supported */
668 0, /* don't ignore, don't halt */
671 /* option vector 4: IBM PAPR implementation */
675 /* option vector 5: PAPR/OF options */
677 0, /* don't ignore, don't halt */
678 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES,
681 /* Old method - ELF header with PT_NOTE sections */
682 static struct fake_elf {
689 char name[8]; /* "PowerPC" */
703 char name[24]; /* "IBM,RPA-Client-Config" */
717 .e_ident = { 0x7f, 'E', 'L', 'F',
718 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
719 .e_type = ET_EXEC, /* yeah right */
721 .e_version = EV_CURRENT,
722 .e_phoff = offsetof(struct fake_elf, phdr),
723 .e_phentsize = sizeof(Elf32_Phdr),
729 .p_offset = offsetof(struct fake_elf, chrpnote),
730 .p_filesz = sizeof(struct chrpnote)
733 .p_offset = offsetof(struct fake_elf, rpanote),
734 .p_filesz = sizeof(struct rpanote)
738 .namesz = sizeof("PowerPC"),
739 .descsz = sizeof(struct chrpdesc),
743 .real_mode = ~0U, /* ~0 means "don't care" */
752 .namesz = sizeof("IBM,RPA-Client-Config"),
753 .descsz = sizeof(struct rpadesc),
755 .name = "IBM,RPA-Client-Config",
758 .min_rmo_size = 64, /* in megabytes */
759 .min_rmo_percent = 0,
760 .max_pft_size = 48, /* 2^48 bytes max PFT size */
768 static void __init prom_send_capabilities(void)
770 ihandle elfloader, root;
773 root = call_prom("open", 1, 1, ADDR("/"));
775 /* try calling the ibm,client-architecture-support method */
776 if (call_prom_ret("call-method", 3, 2, &ret,
777 ADDR("ibm,client-architecture-support"),
779 ADDR(ibm_architecture_vec)) == 0) {
780 /* the call exists... */
782 prom_printf("WARNING: ibm,client-architecture"
783 "-support call FAILED!\n");
784 call_prom("close", 1, 0, root);
787 call_prom("close", 1, 0, root);
790 /* no ibm,client-architecture-support call, try the old way */
791 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
792 if (elfloader == 0) {
793 prom_printf("couldn't open /packages/elf-loader\n");
796 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
797 elfloader, ADDR(&fake_elf));
798 call_prom("close", 1, 0, elfloader);
803 * Memory allocation strategy... our layout is normally:
805 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
806 * rare cases, initrd might end up being before the kernel though.
807 * We assume this won't override the final kernel at 0, we have no
808 * provision to handle that in this version, but it should hopefully
811 * alloc_top is set to the top of RMO, eventually shrink down if the
814 * alloc_bottom is set to the top of kernel/initrd
816 * from there, allocations are done this way : rtas is allocated
817 * topmost, and the device-tree is allocated from the bottom. We try
818 * to grow the device-tree allocation as we progress. If we can't,
819 * then we fail, we don't currently have a facility to restart
820 * elsewhere, but that shouldn't be necessary.
822 * Note that calls to reserve_mem have to be done explicitly, memory
823 * allocated with either alloc_up or alloc_down isn't automatically
829 * Allocates memory in the RMO upward from the kernel/initrd
831 * When align is 0, this is a special case, it means to allocate in place
832 * at the current location of alloc_bottom or fail (that is basically
833 * extending the previous allocation). Used for the device-tree flattening
835 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
837 unsigned long base = RELOC(alloc_bottom);
838 unsigned long addr = 0;
841 base = _ALIGN_UP(base, align);
842 prom_debug("alloc_up(%x, %x)\n", size, align);
843 if (RELOC(ram_top) == 0)
844 prom_panic("alloc_up() called with mem not initialized\n");
847 base = _ALIGN_UP(RELOC(alloc_bottom), align);
849 base = RELOC(alloc_bottom);
851 for(; (base + size) <= RELOC(alloc_top);
852 base = _ALIGN_UP(base + 0x100000, align)) {
853 prom_debug(" trying: 0x%x\n\r", base);
854 addr = (unsigned long)prom_claim(base, size, 0);
855 if (addr != PROM_ERROR && addr != 0)
863 RELOC(alloc_bottom) = addr;
865 prom_debug(" -> %x\n", addr);
866 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
867 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
868 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
869 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
870 prom_debug(" ram_top : %x\n", RELOC(ram_top));
876 * Allocates memory downward, either from top of RMO, or if highmem
877 * is set, from the top of RAM. Note that this one doesn't handle
878 * failures. It does claim memory if highmem is not set.
880 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
883 unsigned long base, addr = 0;
885 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
886 highmem ? RELOC("(high)") : RELOC("(low)"));
887 if (RELOC(ram_top) == 0)
888 prom_panic("alloc_down() called with mem not initialized\n");
891 /* Carve out storage for the TCE table. */
892 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
893 if (addr <= RELOC(alloc_bottom))
895 /* Will we bump into the RMO ? If yes, check out that we
896 * didn't overlap existing allocations there, if we did,
897 * we are dead, we must be the first in town !
899 if (addr < RELOC(rmo_top)) {
900 /* Good, we are first */
901 if (RELOC(alloc_top) == RELOC(rmo_top))
902 RELOC(alloc_top) = RELOC(rmo_top) = addr;
906 RELOC(alloc_top_high) = addr;
910 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
911 for (; base > RELOC(alloc_bottom);
912 base = _ALIGN_DOWN(base - 0x100000, align)) {
913 prom_debug(" trying: 0x%x\n\r", base);
914 addr = (unsigned long)prom_claim(base, size, 0);
915 if (addr != PROM_ERROR && addr != 0)
921 RELOC(alloc_top) = addr;
924 prom_debug(" -> %x\n", addr);
925 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
926 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
927 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
928 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
929 prom_debug(" ram_top : %x\n", RELOC(ram_top));
937 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
942 /* Ignore more than 2 cells */
943 while (s > sizeof(unsigned long) / 4) {
959 * Very dumb function for adding to the memory reserve list, but
960 * we don't need anything smarter at this point
962 * XXX Eventually check for collisions. They should NEVER happen.
963 * If problems seem to show up, it would be a good start to track
966 static void reserve_mem(u64 base, u64 size)
968 u64 top = base + size;
969 unsigned long cnt = RELOC(mem_reserve_cnt);
974 /* We need to always keep one empty entry so that we
975 * have our terminator with "size" set to 0 since we are
976 * dumb and just copy this entire array to the boot params
978 base = _ALIGN_DOWN(base, PAGE_SIZE);
979 top = _ALIGN_UP(top, PAGE_SIZE);
982 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
983 prom_panic("Memory reserve map exhausted !\n");
984 RELOC(mem_reserve_map)[cnt].base = base;
985 RELOC(mem_reserve_map)[cnt].size = size;
986 RELOC(mem_reserve_cnt) = cnt + 1;
990 * Initialize memory allocation mechanism, parse "memory" nodes and
991 * obtain that way the top of memory and RMO to setup out local allocator
993 static void __init prom_init_mem(void)
996 char *path, type[64];
999 struct prom_t *_prom = &RELOC(prom);
1003 * We iterate the memory nodes to find
1004 * 1) top of RMO (first node)
1008 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
1010 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
1011 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1012 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1014 prom_debug("scanning memory:\n");
1015 path = RELOC(prom_scratch);
1017 for (node = 0; prom_next_node(&node); ) {
1019 prom_getprop(node, "device_type", type, sizeof(type));
1023 * CHRP Longtrail machines have no device_type
1024 * on the memory node, so check the name instead...
1026 prom_getprop(node, "name", type, sizeof(type));
1028 if (strcmp(type, RELOC("memory")))
1031 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
1032 if (plen > sizeof(regbuf)) {
1033 prom_printf("memory node too large for buffer !\n");
1034 plen = sizeof(regbuf);
1037 endp = p + (plen / sizeof(cell_t));
1040 memset(path, 0, PROM_SCRATCH_SIZE);
1041 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1042 prom_debug(" node %s :\n", path);
1043 #endif /* DEBUG_PROM */
1045 while ((endp - p) >= (rac + rsc)) {
1046 unsigned long base, size;
1048 base = prom_next_cell(rac, &p);
1049 size = prom_next_cell(rsc, &p);
1053 prom_debug(" %x %x\n", base, size);
1054 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
1055 RELOC(rmo_top) = size;
1056 if ((base + size) > RELOC(ram_top))
1057 RELOC(ram_top) = base + size;
1061 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
1063 /* Check if we have an initrd after the kernel, if we do move our bottom
1066 if (RELOC(prom_initrd_start)) {
1067 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
1068 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
1072 * Setup our top alloc point, that is top of RMO or top of
1073 * segment 0 when running non-LPAR.
1074 * Some RS64 machines have buggy firmware where claims up at
1075 * 1GB fail. Cap at 768MB as a workaround.
1076 * Since 768MB is plenty of room, and we need to cap to something
1077 * reasonable on 32-bit, cap at 768MB on all machines.
1079 if (!RELOC(rmo_top))
1080 RELOC(rmo_top) = RELOC(ram_top);
1081 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
1082 RELOC(alloc_top) = RELOC(rmo_top);
1083 RELOC(alloc_top_high) = RELOC(ram_top);
1085 prom_printf("memory layout at init:\n");
1086 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1087 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
1088 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1089 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
1090 prom_printf(" ram_top : %x\n", RELOC(ram_top));
1095 * Allocate room for and instantiate RTAS
1097 static void __init prom_instantiate_rtas(void)
1101 u32 base, entry = 0;
1104 prom_debug("prom_instantiate_rtas: start...\n");
1106 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1107 prom_debug("rtas_node: %x\n", rtas_node);
1108 if (!PHANDLE_VALID(rtas_node))
1111 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1115 base = alloc_down(size, PAGE_SIZE, 0);
1117 prom_printf("RTAS allocation failed !\n");
1121 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1122 if (!IHANDLE_VALID(rtas_inst)) {
1123 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1127 prom_printf("instantiating rtas at 0x%x ...", base);
1129 if (call_prom_ret("call-method", 3, 2, &entry,
1130 ADDR("instantiate-rtas"),
1131 rtas_inst, base) != 0
1133 prom_printf(" failed\n");
1136 prom_printf(" done\n");
1138 reserve_mem(base, size);
1140 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1141 &base, sizeof(base));
1142 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1143 &entry, sizeof(entry));
1145 prom_debug("rtas base = 0x%x\n", base);
1146 prom_debug("rtas entry = 0x%x\n", entry);
1147 prom_debug("rtas size = 0x%x\n", (long)size);
1149 prom_debug("prom_instantiate_rtas: end...\n");
1154 * Allocate room for and initialize TCE tables
1156 static void __init prom_initialize_tce_table(void)
1160 char compatible[64], type[64], model[64];
1161 char *path = RELOC(prom_scratch);
1163 u32 minalign, minsize;
1164 u64 tce_entry, *tce_entryp;
1165 u64 local_alloc_top, local_alloc_bottom;
1168 if (RELOC(ppc64_iommu_off))
1171 prom_debug("starting prom_initialize_tce_table\n");
1173 /* Cache current top of allocs so we reserve a single block */
1174 local_alloc_top = RELOC(alloc_top_high);
1175 local_alloc_bottom = local_alloc_top;
1177 /* Search all nodes looking for PHBs. */
1178 for (node = 0; prom_next_node(&node); ) {
1182 prom_getprop(node, "compatible",
1183 compatible, sizeof(compatible));
1184 prom_getprop(node, "device_type", type, sizeof(type));
1185 prom_getprop(node, "model", model, sizeof(model));
1187 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1190 /* Keep the old logic in tack to avoid regression. */
1191 if (compatible[0] != 0) {
1192 if ((strstr(compatible, RELOC("python")) == NULL) &&
1193 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1194 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1196 } else if (model[0] != 0) {
1197 if ((strstr(model, RELOC("ython")) == NULL) &&
1198 (strstr(model, RELOC("peedwagon")) == NULL) &&
1199 (strstr(model, RELOC("innipeg")) == NULL))
1203 if (prom_getprop(node, "tce-table-minalign", &minalign,
1204 sizeof(minalign)) == PROM_ERROR)
1206 if (prom_getprop(node, "tce-table-minsize", &minsize,
1207 sizeof(minsize)) == PROM_ERROR)
1208 minsize = 4UL << 20;
1211 * Even though we read what OF wants, we just set the table
1212 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1213 * By doing this, we avoid the pitfalls of trying to DMA to
1214 * MMIO space and the DMA alias hole.
1216 * On POWER4, firmware sets the TCE region by assuming
1217 * each TCE table is 8MB. Using this memory for anything
1218 * else will impact performance, so we always allocate 8MB.
1221 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1222 minsize = 8UL << 20;
1224 minsize = 4UL << 20;
1226 /* Align to the greater of the align or size */
1227 align = max(minalign, minsize);
1228 base = alloc_down(minsize, align, 1);
1230 prom_panic("ERROR, cannot find space for TCE table.\n");
1231 if (base < local_alloc_bottom)
1232 local_alloc_bottom = base;
1234 /* It seems OF doesn't null-terminate the path :-( */
1235 memset(path, 0, sizeof(path));
1236 /* Call OF to setup the TCE hardware */
1237 if (call_prom("package-to-path", 3, 1, node,
1238 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1239 prom_printf("package-to-path failed\n");
1242 /* Save away the TCE table attributes for later use. */
1243 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1244 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1246 prom_debug("TCE table: %s\n", path);
1247 prom_debug("\tnode = 0x%x\n", node);
1248 prom_debug("\tbase = 0x%x\n", base);
1249 prom_debug("\tsize = 0x%x\n", minsize);
1251 /* Initialize the table to have a one-to-one mapping
1252 * over the allocated size.
1254 tce_entryp = (unsigned long *)base;
1255 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1256 tce_entry = (i << PAGE_SHIFT);
1258 *tce_entryp = tce_entry;
1261 prom_printf("opening PHB %s", path);
1262 phb_node = call_prom("open", 1, 1, path);
1264 prom_printf("... failed\n");
1266 prom_printf("... done\n");
1268 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1269 phb_node, -1, minsize,
1270 (u32) base, (u32) (base >> 32));
1271 call_prom("close", 1, 0, phb_node);
1274 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1276 /* These are only really needed if there is a memory limit in
1277 * effect, but we don't know so export them always. */
1278 RELOC(prom_tce_alloc_start) = local_alloc_bottom;
1279 RELOC(prom_tce_alloc_end) = local_alloc_top;
1281 /* Flag the first invalid entry */
1282 prom_debug("ending prom_initialize_tce_table\n");
1287 * With CHRP SMP we need to use the OF to start the other processors.
1288 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1289 * so we have to put the processors into a holding pattern controlled
1290 * by the kernel (not OF) before we destroy the OF.
1292 * This uses a chunk of low memory, puts some holding pattern
1293 * code there and sends the other processors off to there until
1294 * smp_boot_cpus tells them to do something. The holding pattern
1295 * checks that address until its cpu # is there, when it is that
1296 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1297 * of setting those values.
1299 * We also use physical address 0x4 here to tell when a cpu
1300 * is in its holding pattern code.
1304 extern void __secondary_hold(void);
1305 extern unsigned long __secondary_hold_spinloop;
1306 extern unsigned long __secondary_hold_acknowledge;
1309 * We want to reference the copy of __secondary_hold_* in the
1310 * 0 - 0x100 address range
1312 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1314 static void __init prom_hold_cpus(void)
1321 unsigned int interrupt_server[MAX_CPU_THREADS];
1322 unsigned int cpu_threads, hw_cpu_num;
1324 struct prom_t *_prom = &RELOC(prom);
1325 unsigned long *spinloop
1326 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1327 unsigned long *acknowledge
1328 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1330 /* __secondary_hold is actually a descriptor, not the text address */
1331 unsigned long secondary_hold
1332 = __pa(*PTRRELOC((unsigned long *)__secondary_hold));
1334 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1337 prom_debug("prom_hold_cpus: start...\n");
1338 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1339 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1340 prom_debug(" 1) acknowledge = 0x%x\n",
1341 (unsigned long)acknowledge);
1342 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1343 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1345 /* Set the common spinloop variable, so all of the secondary cpus
1346 * will block when they are awakened from their OF spinloop.
1347 * This must occur for both SMP and non SMP kernels, since OF will
1348 * be trashed when we move the kernel.
1353 for (node = 0; prom_next_node(&node); ) {
1355 prom_getprop(node, "device_type", type, sizeof(type));
1356 if (strcmp(type, RELOC("cpu")) != 0)
1359 /* Skip non-configured cpus. */
1360 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1361 if (strcmp(type, RELOC("okay")) != 0)
1365 prom_getprop(node, "reg", ®, sizeof(reg));
1367 prom_debug("\ncpuid = 0x%x\n", cpuid);
1368 prom_debug("cpu hw idx = 0x%x\n", reg);
1370 /* Init the acknowledge var which will be reset by
1371 * the secondary cpu when it awakens from its OF
1374 *acknowledge = (unsigned long)-1;
1376 propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s",
1378 sizeof(interrupt_server));
1380 /* no property. old hardware has no SMT */
1382 interrupt_server[0] = reg; /* fake it with phys id */
1384 /* We have a threaded processor */
1385 cpu_threads = propsize / sizeof(u32);
1386 if (cpu_threads > MAX_CPU_THREADS) {
1387 prom_printf("SMT: too many threads!\n"
1388 "SMT: found %x, max is %x\n",
1389 cpu_threads, MAX_CPU_THREADS);
1390 cpu_threads = 1; /* ToDo: panic? */
1394 hw_cpu_num = interrupt_server[0];
1395 if (hw_cpu_num != _prom->cpu) {
1396 /* Primary Thread of non-boot cpu */
1397 prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg);
1398 call_prom("start-cpu", 3, 0, node,
1399 secondary_hold, reg);
1401 for (i = 0; (i < 100000000) &&
1402 (*acknowledge == ((unsigned long)-1)); i++ )
1405 if (*acknowledge == reg)
1406 prom_printf("done\n");
1408 prom_printf("failed: %x\n", *acknowledge);
1412 prom_printf("%x : boot cpu %x\n", cpuid, reg);
1413 #endif /* CONFIG_SMP */
1415 /* Reserve cpu #s for secondary threads. They start later. */
1416 cpuid += cpu_threads;
1419 if (cpuid > NR_CPUS)
1420 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS)
1421 ") exceeded: ignoring extras\n");
1423 prom_debug("prom_hold_cpus: end...\n");
1427 static void __init prom_init_client_services(unsigned long pp)
1429 struct prom_t *_prom = &RELOC(prom);
1431 /* Get a handle to the prom entry point before anything else */
1432 RELOC(prom_entry) = pp;
1434 /* get a handle for the stdout device */
1435 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1436 if (!PHANDLE_VALID(_prom->chosen))
1437 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1439 /* get device tree root */
1440 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1441 if (!PHANDLE_VALID(_prom->root))
1442 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1449 * For really old powermacs, we need to map things we claim.
1450 * For that, we need the ihandle of the mmu.
1451 * Also, on the longtrail, we need to work around other bugs.
1453 static void __init prom_find_mmu(void)
1455 struct prom_t *_prom = &RELOC(prom);
1459 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1460 if (!PHANDLE_VALID(oprom))
1462 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1464 version[sizeof(version) - 1] = 0;
1465 /* XXX might need to add other versions here */
1466 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1467 of_workarounds = OF_WA_CLAIM;
1468 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1469 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1470 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1473 _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
1474 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1475 sizeof(_prom->mmumap));
1476 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
1477 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1480 #define prom_find_mmu()
1483 static void __init prom_init_stdout(void)
1485 struct prom_t *_prom = &RELOC(prom);
1486 char *path = RELOC(of_stdout_device);
1490 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1491 prom_panic("cannot find stdout");
1493 _prom->stdout = val;
1495 /* Get the full OF pathname of the stdout device */
1496 memset(path, 0, 256);
1497 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1498 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1499 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
1501 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1502 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
1503 path, strlen(path) + 1);
1505 /* If it's a display, note it */
1506 memset(type, 0, sizeof(type));
1507 prom_getprop(val, "device_type", type, sizeof(type));
1508 if (strcmp(type, RELOC("display")) == 0)
1509 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1512 static void __init prom_close_stdin(void)
1514 struct prom_t *_prom = &RELOC(prom);
1517 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1518 call_prom("close", 1, 0, val);
1521 static int __init prom_find_machine_type(void)
1523 struct prom_t *_prom = &RELOC(prom);
1531 /* Look for a PowerMac */
1532 len = prom_getprop(_prom->root, "compatible",
1533 compat, sizeof(compat)-1);
1537 char *p = &compat[i];
1541 if (strstr(p, RELOC("Power Macintosh")) ||
1542 strstr(p, RELOC("MacRISC")))
1543 return PLATFORM_POWERMAC;
1545 /* We must make sure we don't detect the IBM Cell
1546 * blades as pSeries due to some firmware issues,
1549 if (strstr(p, RELOC("IBM,CBEA")) ||
1550 strstr(p, RELOC("IBM,CPBW-1.0")))
1551 return PLATFORM_GENERIC;
1552 #endif /* CONFIG_PPC64 */
1557 /* If not a mac, try to figure out if it's an IBM pSeries or any other
1558 * PAPR compliant platform. We assume it is if :
1559 * - /device_type is "chrp" (please, do NOT use that for future
1563 len = prom_getprop(_prom->root, "device_type",
1564 compat, sizeof(compat)-1);
1566 return PLATFORM_GENERIC;
1567 if (strcmp(compat, RELOC("chrp")))
1568 return PLATFORM_GENERIC;
1570 /* Default to pSeries. We need to know if we are running LPAR */
1571 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1572 if (!PHANDLE_VALID(rtas))
1573 return PLATFORM_GENERIC;
1574 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1575 if (x != PROM_ERROR) {
1576 prom_printf("Hypertas detected, assuming LPAR !\n");
1577 return PLATFORM_PSERIES_LPAR;
1579 return PLATFORM_PSERIES;
1581 return PLATFORM_GENERIC;
1585 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1587 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1591 * If we have a display that we don't know how to drive,
1592 * we will want to try to execute OF's open method for it
1593 * later. However, OF will probably fall over if we do that
1594 * we've taken over the MMU.
1595 * So we check whether we will need to open the display,
1596 * and if so, open it now.
1598 static void __init prom_check_displays(void)
1600 char type[16], *path;
1605 static unsigned char default_colors[] = {
1623 const unsigned char *clut;
1625 prom_printf("Looking for displays\n");
1626 for (node = 0; prom_next_node(&node); ) {
1627 memset(type, 0, sizeof(type));
1628 prom_getprop(node, "device_type", type, sizeof(type));
1629 if (strcmp(type, RELOC("display")) != 0)
1632 /* It seems OF doesn't null-terminate the path :-( */
1633 path = RELOC(prom_scratch);
1634 memset(path, 0, PROM_SCRATCH_SIZE);
1637 * leave some room at the end of the path for appending extra
1640 if (call_prom("package-to-path", 3, 1, node, path,
1641 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1643 prom_printf("found display : %s, opening ... ", path);
1645 ih = call_prom("open", 1, 1, path);
1647 prom_printf("failed\n");
1652 prom_printf("done\n");
1653 prom_setprop(node, path, "linux,opened", NULL, 0);
1655 /* Setup a usable color table when the appropriate
1656 * method is available. Should update this to set-colors */
1657 clut = RELOC(default_colors);
1658 for (i = 0; i < 32; i++, clut += 3)
1659 if (prom_set_color(ih, i, clut[0], clut[1],
1663 #ifdef CONFIG_LOGO_LINUX_CLUT224
1664 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
1665 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
1666 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1669 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1674 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1675 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1676 unsigned long needed, unsigned long align)
1680 *mem_start = _ALIGN(*mem_start, align);
1681 while ((*mem_start + needed) > *mem_end) {
1682 unsigned long room, chunk;
1684 prom_debug("Chunk exhausted, claiming more at %x...\n",
1685 RELOC(alloc_bottom));
1686 room = RELOC(alloc_top) - RELOC(alloc_bottom);
1687 if (room > DEVTREE_CHUNK_SIZE)
1688 room = DEVTREE_CHUNK_SIZE;
1689 if (room < PAGE_SIZE)
1690 prom_panic("No memory for flatten_device_tree (no room)");
1691 chunk = alloc_up(room, 0);
1693 prom_panic("No memory for flatten_device_tree (claim failed)");
1694 *mem_end = RELOC(alloc_top);
1697 ret = (void *)*mem_start;
1698 *mem_start += needed;
1703 #define dt_push_token(token, mem_start, mem_end) \
1704 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1706 static unsigned long __init dt_find_string(char *str)
1710 s = os = (char *)RELOC(dt_string_start);
1712 while (s < (char *)RELOC(dt_string_end)) {
1713 if (strcmp(s, str) == 0)
1721 * The Open Firmware 1275 specification states properties must be 31 bytes or
1722 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1724 #define MAX_PROPERTY_NAME 64
1726 static void __init scan_dt_build_strings(phandle node,
1727 unsigned long *mem_start,
1728 unsigned long *mem_end)
1730 char *prev_name, *namep, *sstart;
1734 sstart = (char *)RELOC(dt_string_start);
1736 /* get and store all property names */
1737 prev_name = RELOC("");
1739 /* 64 is max len of name including nul. */
1740 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
1741 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
1742 /* No more nodes: unwind alloc */
1743 *mem_start = (unsigned long)namep;
1748 if (strcmp(namep, RELOC("name")) == 0) {
1749 *mem_start = (unsigned long)namep;
1750 prev_name = RELOC("name");
1753 /* get/create string entry */
1754 soff = dt_find_string(namep);
1756 *mem_start = (unsigned long)namep;
1757 namep = sstart + soff;
1759 /* Trim off some if we can */
1760 *mem_start = (unsigned long)namep + strlen(namep) + 1;
1761 RELOC(dt_string_end) = *mem_start;
1766 /* do all our children */
1767 child = call_prom("child", 1, 1, node);
1768 while (child != 0) {
1769 scan_dt_build_strings(child, mem_start, mem_end);
1770 child = call_prom("peer", 1, 1, child);
1774 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
1775 unsigned long *mem_end)
1778 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
1780 unsigned char *valp;
1781 static char pname[MAX_PROPERTY_NAME];
1784 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
1786 /* get the node's full name */
1787 namep = (char *)*mem_start;
1788 room = *mem_end - *mem_start;
1791 l = call_prom("package-to-path", 3, 1, node, namep, room);
1793 /* Didn't fit? Get more room. */
1795 if (l >= *mem_end - *mem_start)
1796 namep = make_room(mem_start, mem_end, l+1, 1);
1797 call_prom("package-to-path", 3, 1, node, namep, l);
1801 /* Fixup an Apple bug where they have bogus \0 chars in the
1802 * middle of the path in some properties, and extract
1803 * the unit name (everything after the last '/').
1805 for (lp = p = namep, ep = namep + l; p < ep; p++) {
1812 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
1815 /* get it again for debugging */
1816 path = RELOC(prom_scratch);
1817 memset(path, 0, PROM_SCRATCH_SIZE);
1818 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1820 /* get and store all properties */
1821 prev_name = RELOC("");
1822 sstart = (char *)RELOC(dt_string_start);
1824 if (call_prom("nextprop", 3, 1, node, prev_name,
1829 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
1830 prev_name = RELOC("name");
1834 /* find string offset */
1835 soff = dt_find_string(RELOC(pname));
1837 prom_printf("WARNING: Can't find string index for"
1838 " <%s>, node %s\n", RELOC(pname), path);
1841 prev_name = sstart + soff;
1844 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
1847 if (l == PROM_ERROR)
1849 if (l > MAX_PROPERTY_LENGTH) {
1850 prom_printf("WARNING: ignoring large property ");
1851 /* It seems OF doesn't null-terminate the path :-( */
1852 prom_printf("[%s] ", path);
1853 prom_printf("%s length 0x%x\n", RELOC(pname), l);
1857 /* push property head */
1858 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1859 dt_push_token(l, mem_start, mem_end);
1860 dt_push_token(soff, mem_start, mem_end);
1862 /* push property content */
1863 valp = make_room(mem_start, mem_end, l, 4);
1864 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
1865 *mem_start = _ALIGN(*mem_start, 4);
1868 /* Add a "linux,phandle" property. */
1869 soff = dt_find_string(RELOC("linux,phandle"));
1871 prom_printf("WARNING: Can't find string index for"
1872 " <linux-phandle> node %s\n", path);
1874 dt_push_token(OF_DT_PROP, mem_start, mem_end);
1875 dt_push_token(4, mem_start, mem_end);
1876 dt_push_token(soff, mem_start, mem_end);
1877 valp = make_room(mem_start, mem_end, 4, 4);
1878 *(u32 *)valp = node;
1881 /* do all our children */
1882 child = call_prom("child", 1, 1, node);
1883 while (child != 0) {
1884 scan_dt_build_struct(child, mem_start, mem_end);
1885 child = call_prom("peer", 1, 1, child);
1888 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
1891 static void __init flatten_device_tree(void)
1894 unsigned long mem_start, mem_end, room;
1895 struct boot_param_header *hdr;
1896 struct prom_t *_prom = &RELOC(prom);
1901 * Check how much room we have between alloc top & bottom (+/- a
1902 * few pages), crop to 4Mb, as this is our "chuck" size
1904 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
1905 if (room > DEVTREE_CHUNK_SIZE)
1906 room = DEVTREE_CHUNK_SIZE;
1907 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
1909 /* Now try to claim that */
1910 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
1912 prom_panic("Can't allocate initial device-tree chunk\n");
1913 mem_end = RELOC(alloc_top);
1915 /* Get root of tree */
1916 root = call_prom("peer", 1, 1, (phandle)0);
1917 if (root == (phandle)0)
1918 prom_panic ("couldn't get device tree root\n");
1920 /* Build header and make room for mem rsv map */
1921 mem_start = _ALIGN(mem_start, 4);
1922 hdr = make_room(&mem_start, &mem_end,
1923 sizeof(struct boot_param_header), 4);
1924 RELOC(dt_header_start) = (unsigned long)hdr;
1925 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
1927 /* Start of strings */
1928 mem_start = PAGE_ALIGN(mem_start);
1929 RELOC(dt_string_start) = mem_start;
1930 mem_start += 4; /* hole */
1932 /* Add "linux,phandle" in there, we'll need it */
1933 namep = make_room(&mem_start, &mem_end, 16, 1);
1934 strcpy(namep, RELOC("linux,phandle"));
1935 mem_start = (unsigned long)namep + strlen(namep) + 1;
1937 /* Build string array */
1938 prom_printf("Building dt strings...\n");
1939 scan_dt_build_strings(root, &mem_start, &mem_end);
1940 RELOC(dt_string_end) = mem_start;
1942 /* Build structure */
1943 mem_start = PAGE_ALIGN(mem_start);
1944 RELOC(dt_struct_start) = mem_start;
1945 prom_printf("Building dt structure...\n");
1946 scan_dt_build_struct(root, &mem_start, &mem_end);
1947 dt_push_token(OF_DT_END, &mem_start, &mem_end);
1948 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
1951 hdr->boot_cpuid_phys = _prom->cpu;
1952 hdr->magic = OF_DT_HEADER;
1953 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
1954 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
1955 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
1956 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
1957 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
1958 hdr->version = OF_DT_VERSION;
1959 /* Version 16 is not backward compatible */
1960 hdr->last_comp_version = 0x10;
1962 /* Copy the reserve map in */
1963 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
1968 prom_printf("reserved memory map:\n");
1969 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
1970 prom_printf(" %x - %x\n",
1971 RELOC(mem_reserve_map)[i].base,
1972 RELOC(mem_reserve_map)[i].size);
1975 /* Bump mem_reserve_cnt to cause further reservations to fail
1976 * since it's too late.
1978 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
1980 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1981 RELOC(dt_string_start), RELOC(dt_string_end));
1982 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1983 RELOC(dt_struct_start), RELOC(dt_struct_end));
1987 #ifdef CONFIG_PPC_MAPLE
1988 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
1989 * The values are bad, and it doesn't even have the right number of cells. */
1990 static void __init fixup_device_tree_maple(void)
1993 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
1997 name = "/ht@0/isa@4";
1998 isa = call_prom("finddevice", 1, 1, ADDR(name));
1999 if (!PHANDLE_VALID(isa)) {
2000 name = "/ht@0/isa@6";
2001 isa = call_prom("finddevice", 1, 1, ADDR(name));
2002 rloc = 0x01003000; /* IO space; PCI device = 6 */
2004 if (!PHANDLE_VALID(isa))
2007 if (prom_getproplen(isa, "ranges") != 12)
2009 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2013 if (isa_ranges[0] != 0x1 ||
2014 isa_ranges[1] != 0xf4000000 ||
2015 isa_ranges[2] != 0x00010000)
2018 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2020 isa_ranges[0] = 0x1;
2021 isa_ranges[1] = 0x0;
2022 isa_ranges[2] = rloc;
2023 isa_ranges[3] = 0x0;
2024 isa_ranges[4] = 0x0;
2025 isa_ranges[5] = 0x00010000;
2026 prom_setprop(isa, name, "ranges",
2027 isa_ranges, sizeof(isa_ranges));
2030 #define fixup_device_tree_maple()
2033 #ifdef CONFIG_PPC_CHRP
2034 /* Pegasos lacks the "ranges" property in the isa node */
2035 static void __init fixup_device_tree_chrp(void)
2042 name = "/pci@80000000/isa@c";
2043 isa = call_prom("finddevice", 1, 1, ADDR(name));
2044 if (!PHANDLE_VALID(isa))
2047 rc = prom_getproplen(isa, "ranges");
2048 if (rc != 0 && rc != PROM_ERROR)
2051 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2053 isa_ranges[0] = 0x1;
2054 isa_ranges[1] = 0x0;
2055 isa_ranges[2] = 0x01006000;
2056 isa_ranges[3] = 0x0;
2057 isa_ranges[4] = 0x0;
2058 isa_ranges[5] = 0x00010000;
2059 prom_setprop(isa, name, "ranges",
2060 isa_ranges, sizeof(isa_ranges));
2063 #define fixup_device_tree_chrp()
2066 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2067 static void __init fixup_device_tree_pmac(void)
2069 phandle u3, i2c, mpic;
2074 /* Some G5s have a missing interrupt definition, fix it up here */
2075 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2076 if (!PHANDLE_VALID(u3))
2078 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2079 if (!PHANDLE_VALID(i2c))
2081 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2082 if (!PHANDLE_VALID(mpic))
2085 /* check if proper rev of u3 */
2086 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2089 if (u3_rev < 0x35 || u3_rev > 0x39)
2091 /* does it need fixup ? */
2092 if (prom_getproplen(i2c, "interrupts") > 0)
2095 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2097 /* interrupt on this revision of u3 is number 0 and level */
2100 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2101 &interrupts, sizeof(interrupts));
2103 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2104 &parent, sizeof(parent));
2107 #define fixup_device_tree_pmac()
2110 static void __init fixup_device_tree(void)
2112 fixup_device_tree_maple();
2113 fixup_device_tree_chrp();
2114 fixup_device_tree_pmac();
2117 static void __init prom_find_boot_cpu(void)
2119 struct prom_t *_prom = &RELOC(prom);
2125 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2128 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2130 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2131 _prom->cpu = getprop_rval;
2133 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu);
2136 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2138 #ifdef CONFIG_BLK_DEV_INITRD
2139 struct prom_t *_prom = &RELOC(prom);
2141 if (r3 && r4 && r4 != 0xdeadbeef) {
2144 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
2145 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
2147 val = RELOC(prom_initrd_start);
2148 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
2150 val = RELOC(prom_initrd_end);
2151 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
2154 reserve_mem(RELOC(prom_initrd_start),
2155 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
2157 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
2158 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
2160 #endif /* CONFIG_BLK_DEV_INITRD */
2164 * We enter here early on, when the Open Firmware prom is still
2165 * handling exceptions and the MMU hash table for us.
2168 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2170 unsigned long r6, unsigned long r7)
2172 struct prom_t *_prom;
2174 unsigned long offset = reloc_offset();
2180 _prom = &RELOC(prom);
2183 * First zero the BSS
2185 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
2188 * Init interface to Open Firmware, get some node references,
2191 prom_init_client_services(pp);
2194 * See if this OF is old enough that we need to do explicit maps
2195 * and other workarounds
2200 * Init prom stdout device
2205 * Get default machine type. At this point, we do not differentiate
2206 * between pSeries SMP and pSeries LPAR
2208 RELOC(of_platform) = prom_find_machine_type();
2210 /* Bail if this is a kdump kernel. */
2211 if (PHYSICAL_START > 0)
2212 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2215 * Check for an initrd
2217 prom_check_initrd(r3, r4);
2219 #ifdef CONFIG_PPC_PSERIES
2221 * On pSeries, inform the firmware about our capabilities
2223 if (RELOC(of_platform) == PLATFORM_PSERIES ||
2224 RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
2225 prom_send_capabilities();
2229 * Copy the CPU hold code
2231 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2232 copy_and_flush(0, KERNELBASE + offset, 0x100, 0);
2235 * Do early parsing of command line
2237 early_cmdline_parse();
2240 * Initialize memory management within prom_init
2245 * Determine which cpu is actually running right _now_
2247 prom_find_boot_cpu();
2250 * Initialize display devices
2252 prom_check_displays();
2256 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2257 * that uses the allocator, we need to make sure we get the top of memory
2258 * available for us here...
2260 if (RELOC(of_platform) == PLATFORM_PSERIES)
2261 prom_initialize_tce_table();
2265 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2266 * in spin-loops. PowerMacs don't have a working RTAS and use
2267 * a different way to spin CPUs
2269 if (RELOC(of_platform) != PLATFORM_POWERMAC) {
2270 prom_instantiate_rtas();
2275 * Fill in some infos for use by the kernel later on
2278 if (RELOC(ppc64_iommu_off))
2279 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
2282 if (RELOC(iommu_force_on))
2283 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
2286 if (RELOC(prom_tce_alloc_start)) {
2287 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
2288 &RELOC(prom_tce_alloc_start),
2289 sizeof(prom_tce_alloc_start));
2290 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
2291 &RELOC(prom_tce_alloc_end),
2292 sizeof(prom_tce_alloc_end));
2297 * Fixup any known bugs in the device-tree
2299 fixup_device_tree();
2302 * Now finally create the flattened device-tree
2304 prom_printf("copying OF device tree ...\n");
2305 flatten_device_tree();
2308 * in case stdin is USB and still active on IBM machines...
2309 * Unfortunately quiesce crashes on some powermacs if we have
2310 * closed stdin already (in particular the powerbook 101).
2312 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2316 * Call OF "quiesce" method to shut down pending DMA's from
2319 prom_printf("Calling quiesce ...\n");
2320 call_prom("quiesce", 0, 0);
2323 * And finally, call the kernel passing it the flattened device
2324 * tree and NULL as r5, thus triggering the new entry point which
2325 * is common to us and kexec
2327 hdr = RELOC(dt_header_start);
2328 prom_printf("returning from prom_init\n");
2329 prom_debug("->dt_header_start=0x%x\n", hdr);
2332 reloc_got2(-offset);
2335 __start(hdr, KERNELBASE + offset, 0);