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>
39 #include <asm/pgtable.h>
41 #include <asm/iommu.h>
42 #include <asm/btext.h>
43 #include <asm/sections.h>
44 #include <asm/machdep.h>
47 #include <linux/linux_logo.h>
50 * Eventually bump that one up
52 #define DEVTREE_CHUNK_SIZE 0x100000
55 * This is the size of the local memory reserve map that gets copied
56 * into the boot params passed to the kernel. That size is totally
57 * flexible as the kernel just reads the list until it encounters an
58 * entry with size 0, so it can be changed without breaking binary
61 #define MEM_RESERVE_MAP_SIZE 8
64 * prom_init() is called very early on, before the kernel text
65 * and data have been mapped to KERNELBASE. At this point the code
66 * is running at whatever address it has been loaded at.
67 * On ppc32 we compile with -mrelocatable, which means that references
68 * to extern and static variables get relocated automatically.
69 * ppc64 objects are always relocatable, we just need to relocate the
72 * Because OF may have mapped I/O devices into the area starting at
73 * KERNELBASE, particularly on CHRP machines, we can't safely call
74 * OF once the kernel has been mapped to KERNELBASE. Therefore all
75 * OF calls must be done within prom_init().
77 * ADDR is used in calls to call_prom. The 4th and following
78 * arguments to call_prom should be 32-bit values.
79 * On ppc64, 64 bit values are truncated to 32 bits (and
80 * fortunately don't get interpreted as two arguments).
82 #define ADDR(x) (u32)(unsigned long)(x)
85 #define OF_WORKAROUNDS 0
87 #define OF_WORKAROUNDS of_workarounds
91 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
92 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
94 #define PROM_BUG() do { \
95 prom_printf("kernel BUG at %s line 0x%x!\n", \
96 __FILE__, __LINE__); \
97 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
101 #define prom_debug(x...) prom_printf(x)
103 #define prom_debug(x...)
107 typedef u32 prom_arg_t;
125 struct mem_map_entry {
132 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
133 unsigned long r6, unsigned long r7, unsigned long r8,
137 extern int enter_prom(struct prom_args *args, unsigned long entry);
139 static inline int enter_prom(struct prom_args *args, unsigned long entry)
141 return ((int (*)(struct prom_args *))entry)(args);
145 extern void copy_and_flush(unsigned long dest, unsigned long src,
146 unsigned long size, unsigned long offset);
149 static struct prom_t __initdata prom;
151 static unsigned long prom_entry __initdata;
153 #define PROM_SCRATCH_SIZE 256
155 static char __initdata of_stdout_device[256];
156 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
158 static unsigned long __initdata dt_header_start;
159 static unsigned long __initdata dt_struct_start, dt_struct_end;
160 static unsigned long __initdata dt_string_start, dt_string_end;
162 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
165 static int __initdata prom_iommu_force_on;
166 static int __initdata prom_iommu_off;
167 static unsigned long __initdata prom_tce_alloc_start;
168 static unsigned long __initdata prom_tce_alloc_end;
171 /* Platforms codes are now obsolete in the kernel. Now only used within this
172 * file and ultimately gone too. Feel free to change them if you need, they
173 * are not shared with anything outside of this file anymore
175 #define PLATFORM_PSERIES 0x0100
176 #define PLATFORM_PSERIES_LPAR 0x0101
177 #define PLATFORM_LPAR 0x0001
178 #define PLATFORM_POWERMAC 0x0400
179 #define PLATFORM_GENERIC 0x0500
180 #define PLATFORM_OPAL 0x0600
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];
201 * Error results ... some OF calls will return "-1" on error, some
202 * will return 0, some will return either. To simplify, here are
203 * macros to use with any ihandle or phandle return value to check if
207 #define PROM_ERROR (-1u)
208 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
209 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
212 /* This is the one and *ONLY* place where we actually call open
216 static int __init call_prom(const char *service, int nargs, int nret, ...)
219 struct prom_args args;
222 args.service = ADDR(service);
226 va_start(list, nret);
227 for (i = 0; i < nargs; i++)
228 args.args[i] = va_arg(list, prom_arg_t);
231 for (i = 0; i < nret; i++)
232 args.args[nargs+i] = 0;
234 if (enter_prom(&args, prom_entry) < 0)
237 return (nret > 0) ? args.args[nargs] : 0;
240 static int __init call_prom_ret(const char *service, int nargs, int nret,
241 prom_arg_t *rets, ...)
244 struct prom_args args;
247 args.service = ADDR(service);
251 va_start(list, rets);
252 for (i = 0; i < nargs; i++)
253 args.args[i] = va_arg(list, prom_arg_t);
256 for (i = 0; i < nret; i++)
257 args.args[nargs+i] = 0;
259 if (enter_prom(&args, prom_entry) < 0)
263 for (i = 1; i < nret; ++i)
264 rets[i-1] = args.args[nargs+i];
266 return (nret > 0) ? args.args[nargs] : 0;
270 static void __init prom_print(const char *msg)
274 if (prom.stdout == 0)
277 for (p = msg; *p != 0; p = q) {
278 for (q = p; *q != 0 && *q != '\n'; ++q)
281 call_prom("write", 3, 1, prom.stdout, p, q - p);
285 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
290 static void __init prom_print_hex(unsigned long val)
292 int i, nibbles = sizeof(val)*2;
293 char buf[sizeof(val)*2+1];
295 for (i = nibbles-1; i >= 0; i--) {
296 buf[i] = (val & 0xf) + '0';
298 buf[i] += ('a'-'0'-10);
302 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
305 /* max number of decimal digits in an unsigned long */
307 static void __init prom_print_dec(unsigned long val)
310 char buf[UL_DIGITS+1];
312 for (i = UL_DIGITS-1; i >= 0; i--) {
313 buf[i] = (val % 10) + '0';
318 /* shift stuff down */
319 size = UL_DIGITS - i;
320 call_prom("write", 3, 1, prom.stdout, buf+i, size);
323 static void __init prom_printf(const char *format, ...)
325 const char *p, *q, *s;
330 va_start(args, format);
331 for (p = format; *p != 0; p = q) {
332 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
335 call_prom("write", 3, 1, prom.stdout, p, q - p);
340 call_prom("write", 3, 1, prom.stdout,
350 s = va_arg(args, const char *);
355 v = va_arg(args, unsigned long);
360 vs = va_arg(args, int);
371 else if (*q == 'x') {
373 v = va_arg(args, unsigned long);
375 } else if (*q == 'u') { /* '%lu' */
377 v = va_arg(args, unsigned long);
379 } else if (*q == 'd') { /* %ld */
381 vs = va_arg(args, long);
394 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
398 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
400 * Old OF requires we claim physical and virtual separately
401 * and then map explicitly (assuming virtual mode)
406 ret = call_prom_ret("call-method", 5, 2, &result,
407 ADDR("claim"), prom.memory,
409 if (ret != 0 || result == -1)
411 ret = call_prom_ret("call-method", 5, 2, &result,
412 ADDR("claim"), prom.mmumap,
415 call_prom("call-method", 4, 1, ADDR("release"),
416 prom.memory, size, virt);
419 /* the 0x12 is M (coherence) + PP == read/write */
420 call_prom("call-method", 6, 1,
421 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
424 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
428 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
431 /* Do not call exit because it clears the screen on pmac
432 * it also causes some sort of double-fault on early pmacs */
433 if (of_platform == PLATFORM_POWERMAC)
436 /* ToDo: should put up an SRC here on pSeries */
437 call_prom("exit", 0, 0);
439 for (;;) /* should never get here */
444 static int __init prom_next_node(phandle *nodep)
448 if ((node = *nodep) != 0
449 && (*nodep = call_prom("child", 1, 1, node)) != 0)
451 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
454 if ((node = call_prom("parent", 1, 1, node)) == 0)
456 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
461 static int inline prom_getprop(phandle node, const char *pname,
462 void *value, size_t valuelen)
464 return call_prom("getprop", 4, 1, node, ADDR(pname),
465 (u32)(unsigned long) value, (u32) valuelen);
468 static int inline prom_getproplen(phandle node, const char *pname)
470 return call_prom("getproplen", 2, 1, node, ADDR(pname));
473 static void add_string(char **str, const char *q)
483 static char *tohex(unsigned int x)
485 static char digits[] = "0123456789abcdef";
486 static char result[9];
493 result[i] = digits[x & 0xf];
495 } while (x != 0 && i > 0);
499 static int __init prom_setprop(phandle node, const char *nodename,
500 const char *pname, void *value, size_t valuelen)
504 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
505 return call_prom("setprop", 4, 1, node, ADDR(pname),
506 (u32)(unsigned long) value, (u32) valuelen);
508 /* gah... setprop doesn't work on longtrail, have to use interpret */
510 add_string(&p, "dev");
511 add_string(&p, nodename);
512 add_string(&p, tohex((u32)(unsigned long) value));
513 add_string(&p, tohex(valuelen));
514 add_string(&p, tohex(ADDR(pname)));
515 add_string(&p, tohex(strlen(pname)));
516 add_string(&p, "property");
518 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
521 /* We can't use the standard versions because of relocation headaches. */
522 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
523 || ('a' <= (c) && (c) <= 'f') \
524 || ('A' <= (c) && (c) <= 'F'))
526 #define isdigit(c) ('0' <= (c) && (c) <= '9')
527 #define islower(c) ('a' <= (c) && (c) <= 'z')
528 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
530 unsigned long prom_strtoul(const char *cp, const char **endp)
532 unsigned long result = 0, base = 10, value;
537 if (toupper(*cp) == 'X') {
543 while (isxdigit(*cp) &&
544 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
545 result = result * base + value;
555 unsigned long prom_memparse(const char *ptr, const char **retptr)
557 unsigned long ret = prom_strtoul(ptr, retptr);
561 * We can't use a switch here because GCC *may* generate a
562 * jump table which won't work, because we're not running at
563 * the address we're linked at.
565 if ('G' == **retptr || 'g' == **retptr)
568 if ('M' == **retptr || 'm' == **retptr)
571 if ('K' == **retptr || 'k' == **retptr)
583 * Early parsing of the command line passed to the kernel, used for
584 * "mem=x" and the options that affect the iommu
586 static void __init early_cmdline_parse(void)
593 prom_cmd_line[0] = 0;
595 if ((long)prom.chosen > 0)
596 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
597 #ifdef CONFIG_CMDLINE
598 if (l <= 0 || p[0] == '\0') /* dbl check */
599 strlcpy(prom_cmd_line,
600 CONFIG_CMDLINE, sizeof(prom_cmd_line));
601 #endif /* CONFIG_CMDLINE */
602 prom_printf("command line: %s\n", prom_cmd_line);
605 opt = strstr(prom_cmd_line, "iommu=");
607 prom_printf("iommu opt is: %s\n", opt);
609 while (*opt && *opt == ' ')
611 if (!strncmp(opt, "off", 3))
613 else if (!strncmp(opt, "force", 5))
614 prom_iommu_force_on = 1;
617 opt = strstr(prom_cmd_line, "mem=");
620 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
622 /* Align to 16 MB == size of ppc64 large page */
623 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
628 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
630 * The architecture vector has an array of PVR mask/value pairs,
631 * followed by # option vectors - 1, followed by the option vectors.
633 * See prom.h for the definition of the bits specified in the
634 * architecture vector.
636 * Because the description vector contains a mix of byte and word
637 * values, we declare it as an unsigned char array, and use this
638 * macro to put word values in.
640 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
641 ((x) >> 8) & 0xff, (x) & 0xff
643 unsigned char ibm_architecture_vec[] = {
644 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
645 W(0xffff0000), W(0x003e0000), /* POWER6 */
646 W(0xffff0000), W(0x003f0000), /* POWER7 */
647 W(0xffff0000), W(0x004b0000), /* POWER8 */
648 W(0xffffffff), W(0x0f000004), /* all 2.07-compliant */
649 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
650 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
651 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
652 6 - 1, /* 6 option vectors */
654 /* option vector 1: processor architectures supported */
656 0, /* don't ignore, don't halt */
657 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
658 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
660 /* option vector 2: Open Firmware options supported */
664 W(0xffffffff), /* real_base */
665 W(0xffffffff), /* real_size */
666 W(0xffffffff), /* virt_base */
667 W(0xffffffff), /* virt_size */
668 W(0xffffffff), /* load_base */
669 W(256), /* 256MB min RMA */
670 W(0xffffffff), /* full client load */
671 0, /* min RMA percentage of total RAM */
672 48, /* max log_2(hash table size) */
674 /* option vector 3: processor options supported */
676 0, /* don't ignore, don't halt */
677 OV3_FP | OV3_VMX | OV3_DFP,
679 /* option vector 4: IBM PAPR implementation */
682 OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
684 /* option vector 5: PAPR/OF options */
686 0, /* don't ignore, don't halt */
687 OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
688 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
689 #ifdef CONFIG_PCI_MSI
690 /* PCIe/MSI support. Without MSI full PCIe is not supported */
696 #ifdef CONFIG_PPC_SMLPAR
697 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
701 OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
705 /* WARNING: The offset of the "number of cores" field below
706 * must match by the macro below. Update the definition if
707 * the structure layout changes.
709 #define IBM_ARCH_VEC_NRCORES_OFFSET 117
710 W(NR_CPUS), /* number of cores supported */
715 OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) |
716 OV5_FEAT(OV5_PFO_HW_842),
717 OV5_FEAT(OV5_SUB_PROCESSORS),
718 /* option vector 6: IBM PAPR hints */
726 /* Old method - ELF header with PT_NOTE sections */
727 static struct fake_elf {
734 char name[8]; /* "PowerPC" */
748 char name[24]; /* "IBM,RPA-Client-Config" */
762 .e_ident = { 0x7f, 'E', 'L', 'F',
763 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
764 .e_type = ET_EXEC, /* yeah right */
766 .e_version = EV_CURRENT,
767 .e_phoff = offsetof(struct fake_elf, phdr),
768 .e_phentsize = sizeof(Elf32_Phdr),
774 .p_offset = offsetof(struct fake_elf, chrpnote),
775 .p_filesz = sizeof(struct chrpnote)
778 .p_offset = offsetof(struct fake_elf, rpanote),
779 .p_filesz = sizeof(struct rpanote)
783 .namesz = sizeof("PowerPC"),
784 .descsz = sizeof(struct chrpdesc),
788 .real_mode = ~0U, /* ~0 means "don't care" */
797 .namesz = sizeof("IBM,RPA-Client-Config"),
798 .descsz = sizeof(struct rpadesc),
800 .name = "IBM,RPA-Client-Config",
803 .min_rmo_size = 64, /* in megabytes */
804 .min_rmo_percent = 0,
805 .max_pft_size = 48, /* 2^48 bytes max PFT size */
813 static int __init prom_count_smt_threads(void)
819 /* Pick up th first CPU node we can find */
820 for (node = 0; prom_next_node(&node); ) {
822 prom_getprop(node, "device_type", type, sizeof(type));
824 if (strcmp(type, "cpu"))
827 * There is an entry for each smt thread, each entry being
828 * 4 bytes long. All cpus should have the same number of
829 * smt threads, so return after finding the first.
831 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
832 if (plen == PROM_ERROR)
835 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
838 if (plen < 1 || plen > 64) {
839 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
840 (unsigned long)plen);
845 prom_debug("No threads found, assuming 1 per core\n");
852 static void __init prom_send_capabilities(void)
854 ihandle elfloader, root;
858 root = call_prom("open", 1, 1, ADDR("/"));
860 /* We need to tell the FW about the number of cores we support.
862 * To do that, we count the number of threads on the first core
863 * (we assume this is the same for all cores) and use it to
866 cores = (u32 *)&ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
867 if (*cores != NR_CPUS) {
868 prom_printf("WARNING ! "
869 "ibm_architecture_vec structure inconsistent: %lu!\n",
872 *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
873 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
877 /* try calling the ibm,client-architecture-support method */
878 prom_printf("Calling ibm,client-architecture-support...");
879 if (call_prom_ret("call-method", 3, 2, &ret,
880 ADDR("ibm,client-architecture-support"),
882 ADDR(ibm_architecture_vec)) == 0) {
883 /* the call exists... */
885 prom_printf("\nWARNING: ibm,client-architecture"
886 "-support call FAILED!\n");
887 call_prom("close", 1, 0, root);
888 prom_printf(" done\n");
891 call_prom("close", 1, 0, root);
892 prom_printf(" not implemented\n");
895 /* no ibm,client-architecture-support call, try the old way */
896 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
897 if (elfloader == 0) {
898 prom_printf("couldn't open /packages/elf-loader\n");
901 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
902 elfloader, ADDR(&fake_elf));
903 call_prom("close", 1, 0, elfloader);
908 * Memory allocation strategy... our layout is normally:
910 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
911 * rare cases, initrd might end up being before the kernel though.
912 * We assume this won't override the final kernel at 0, we have no
913 * provision to handle that in this version, but it should hopefully
916 * alloc_top is set to the top of RMO, eventually shrink down if the
919 * alloc_bottom is set to the top of kernel/initrd
921 * from there, allocations are done this way : rtas is allocated
922 * topmost, and the device-tree is allocated from the bottom. We try
923 * to grow the device-tree allocation as we progress. If we can't,
924 * then we fail, we don't currently have a facility to restart
925 * elsewhere, but that shouldn't be necessary.
927 * Note that calls to reserve_mem have to be done explicitly, memory
928 * allocated with either alloc_up or alloc_down isn't automatically
934 * Allocates memory in the RMO upward from the kernel/initrd
936 * When align is 0, this is a special case, it means to allocate in place
937 * at the current location of alloc_bottom or fail (that is basically
938 * extending the previous allocation). Used for the device-tree flattening
940 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
942 unsigned long base = alloc_bottom;
943 unsigned long addr = 0;
946 base = _ALIGN_UP(base, align);
947 prom_debug("alloc_up(%x, %x)\n", size, align);
949 prom_panic("alloc_up() called with mem not initialized\n");
952 base = _ALIGN_UP(alloc_bottom, align);
956 for(; (base + size) <= alloc_top;
957 base = _ALIGN_UP(base + 0x100000, align)) {
958 prom_debug(" trying: 0x%x\n\r", base);
959 addr = (unsigned long)prom_claim(base, size, 0);
960 if (addr != PROM_ERROR && addr != 0)
968 alloc_bottom = addr + size;
970 prom_debug(" -> %x\n", addr);
971 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
972 prom_debug(" alloc_top : %x\n", alloc_top);
973 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
974 prom_debug(" rmo_top : %x\n", rmo_top);
975 prom_debug(" ram_top : %x\n", ram_top);
981 * Allocates memory downward, either from top of RMO, or if highmem
982 * is set, from the top of RAM. Note that this one doesn't handle
983 * failures. It does claim memory if highmem is not set.
985 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
988 unsigned long base, addr = 0;
990 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
991 highmem ? "(high)" : "(low)");
993 prom_panic("alloc_down() called with mem not initialized\n");
996 /* Carve out storage for the TCE table. */
997 addr = _ALIGN_DOWN(alloc_top_high - size, align);
998 if (addr <= alloc_bottom)
1000 /* Will we bump into the RMO ? If yes, check out that we
1001 * didn't overlap existing allocations there, if we did,
1002 * we are dead, we must be the first in town !
1004 if (addr < rmo_top) {
1005 /* Good, we are first */
1006 if (alloc_top == rmo_top)
1007 alloc_top = rmo_top = addr;
1011 alloc_top_high = addr;
1015 base = _ALIGN_DOWN(alloc_top - size, align);
1016 for (; base > alloc_bottom;
1017 base = _ALIGN_DOWN(base - 0x100000, align)) {
1018 prom_debug(" trying: 0x%x\n\r", base);
1019 addr = (unsigned long)prom_claim(base, size, 0);
1020 if (addr != PROM_ERROR && addr != 0)
1029 prom_debug(" -> %x\n", addr);
1030 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1031 prom_debug(" alloc_top : %x\n", alloc_top);
1032 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1033 prom_debug(" rmo_top : %x\n", rmo_top);
1034 prom_debug(" ram_top : %x\n", ram_top);
1040 * Parse a "reg" cell
1042 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1045 unsigned long r = 0;
1047 /* Ignore more than 2 cells */
1048 while (s > sizeof(unsigned long) / 4) {
1064 * Very dumb function for adding to the memory reserve list, but
1065 * we don't need anything smarter at this point
1067 * XXX Eventually check for collisions. They should NEVER happen.
1068 * If problems seem to show up, it would be a good start to track
1071 static void __init reserve_mem(u64 base, u64 size)
1073 u64 top = base + size;
1074 unsigned long cnt = mem_reserve_cnt;
1079 /* We need to always keep one empty entry so that we
1080 * have our terminator with "size" set to 0 since we are
1081 * dumb and just copy this entire array to the boot params
1083 base = _ALIGN_DOWN(base, PAGE_SIZE);
1084 top = _ALIGN_UP(top, PAGE_SIZE);
1087 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1088 prom_panic("Memory reserve map exhausted !\n");
1089 mem_reserve_map[cnt].base = base;
1090 mem_reserve_map[cnt].size = size;
1091 mem_reserve_cnt = cnt + 1;
1095 * Initialize memory allocation mechanism, parse "memory" nodes and
1096 * obtain that way the top of memory and RMO to setup out local allocator
1098 static void __init prom_init_mem(void)
1101 char *path, type[64];
1107 * We iterate the memory nodes to find
1108 * 1) top of RMO (first node)
1112 prom_getprop(prom.root, "#address-cells", &rac, sizeof(rac));
1114 prom_getprop(prom.root, "#size-cells", &rsc, sizeof(rsc));
1115 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1116 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1118 prom_debug("scanning memory:\n");
1119 path = prom_scratch;
1121 for (node = 0; prom_next_node(&node); ) {
1123 prom_getprop(node, "device_type", type, sizeof(type));
1127 * CHRP Longtrail machines have no device_type
1128 * on the memory node, so check the name instead...
1130 prom_getprop(node, "name", type, sizeof(type));
1132 if (strcmp(type, "memory"))
1135 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1136 if (plen > sizeof(regbuf)) {
1137 prom_printf("memory node too large for buffer !\n");
1138 plen = sizeof(regbuf);
1141 endp = p + (plen / sizeof(cell_t));
1144 memset(path, 0, PROM_SCRATCH_SIZE);
1145 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1146 prom_debug(" node %s :\n", path);
1147 #endif /* DEBUG_PROM */
1149 while ((endp - p) >= (rac + rsc)) {
1150 unsigned long base, size;
1152 base = prom_next_cell(rac, &p);
1153 size = prom_next_cell(rsc, &p);
1157 prom_debug(" %x %x\n", base, size);
1158 if (base == 0 && (of_platform & PLATFORM_LPAR))
1160 if ((base + size) > ram_top)
1161 ram_top = base + size;
1165 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1168 * If prom_memory_limit is set we reduce the upper limits *except* for
1169 * alloc_top_high. This must be the real top of RAM so we can put
1173 alloc_top_high = ram_top;
1175 if (prom_memory_limit) {
1176 if (prom_memory_limit <= alloc_bottom) {
1177 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1179 prom_memory_limit = 0;
1180 } else if (prom_memory_limit >= ram_top) {
1181 prom_printf("Ignoring mem=%x >= ram_top.\n",
1183 prom_memory_limit = 0;
1185 ram_top = prom_memory_limit;
1186 rmo_top = min(rmo_top, prom_memory_limit);
1191 * Setup our top alloc point, that is top of RMO or top of
1192 * segment 0 when running non-LPAR.
1193 * Some RS64 machines have buggy firmware where claims up at
1194 * 1GB fail. Cap at 768MB as a workaround.
1195 * Since 768MB is plenty of room, and we need to cap to something
1196 * reasonable on 32-bit, cap at 768MB on all machines.
1200 rmo_top = min(0x30000000ul, rmo_top);
1201 alloc_top = rmo_top;
1202 alloc_top_high = ram_top;
1205 * Check if we have an initrd after the kernel but still inside
1206 * the RMO. If we do move our bottom point to after it.
1208 if (prom_initrd_start &&
1209 prom_initrd_start < rmo_top &&
1210 prom_initrd_end > alloc_bottom)
1211 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1213 prom_printf("memory layout at init:\n");
1214 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1215 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1216 prom_printf(" alloc_top : %x\n", alloc_top);
1217 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1218 prom_printf(" rmo_top : %x\n", rmo_top);
1219 prom_printf(" ram_top : %x\n", ram_top);
1222 static void __init prom_close_stdin(void)
1226 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0)
1227 call_prom("close", 1, 0, val);
1230 #ifdef CONFIG_PPC_POWERNV
1232 static u64 __initdata prom_opal_size;
1233 static u64 __initdata prom_opal_align;
1234 static int __initdata prom_rtas_start_cpu;
1235 static u64 __initdata prom_rtas_data;
1236 static u64 __initdata prom_rtas_entry;
1238 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1239 static u64 __initdata prom_opal_base;
1240 static u64 __initdata prom_opal_entry;
1243 /* XXX Don't change this structure without updating opal-takeover.S */
1244 static struct opal_secondary_data {
1247 struct opal_takeover_args args; /* 16 */
1248 } opal_secondary_data;
1250 extern char opal_secondary_entry;
1252 static void __init prom_query_opal(void)
1256 /* We must not query for OPAL presence on a machine that
1257 * supports TNK takeover (970 blades), as this uses the same
1258 * h-call with different arguments and will crash
1260 if (PHANDLE_VALID(call_prom("finddevice", 1, 1,
1261 ADDR("/tnk-memory-map")))) {
1262 prom_printf("TNK takeover detected, skipping OPAL check\n");
1266 prom_printf("Querying for OPAL presence... ");
1267 rc = opal_query_takeover(&prom_opal_size,
1269 prom_debug("(rc = %ld) ", rc);
1271 prom_printf("not there.\n");
1274 of_platform = PLATFORM_OPAL;
1275 prom_printf(" there !\n");
1276 prom_debug(" opal_size = 0x%lx\n", prom_opal_size);
1277 prom_debug(" opal_align = 0x%lx\n", prom_opal_align);
1278 if (prom_opal_align < 0x10000)
1279 prom_opal_align = 0x10000;
1282 static int prom_rtas_call(int token, int nargs, int nret, int *outputs, ...)
1284 struct rtas_args rtas_args;
1288 rtas_args.token = token;
1289 rtas_args.nargs = nargs;
1290 rtas_args.nret = nret;
1291 rtas_args.rets = (rtas_arg_t *)&(rtas_args.args[nargs]);
1292 va_start(list, outputs);
1293 for (i = 0; i < nargs; ++i)
1294 rtas_args.args[i] = va_arg(list, rtas_arg_t);
1297 for (i = 0; i < nret; ++i)
1298 rtas_args.rets[i] = 0;
1300 opal_enter_rtas(&rtas_args, prom_rtas_data,
1303 if (nret > 1 && outputs != NULL)
1304 for (i = 0; i < nret-1; ++i)
1305 outputs[i] = rtas_args.rets[i+1];
1306 return (nret > 0)? rtas_args.rets[0]: 0;
1309 static void __init prom_opal_hold_cpus(void)
1311 int i, cnt, cpu, rc;
1316 void *entry = (unsigned long *)&opal_secondary_entry;
1317 struct opal_secondary_data *data = &opal_secondary_data;
1319 prom_debug("prom_opal_hold_cpus: start...\n");
1320 prom_debug(" - entry = 0x%x\n", entry);
1321 prom_debug(" - data = 0x%x\n", data);
1327 for (node = 0; prom_next_node(&node); ) {
1329 prom_getprop(node, "device_type", type, sizeof(type));
1330 if (strcmp(type, "cpu") != 0)
1333 /* Skip non-configured cpus. */
1334 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1335 if (strcmp(type, "okay") != 0)
1338 cnt = prom_getprop(node, "ibm,ppc-interrupt-server#s", servers,
1340 if (cnt == PROM_ERROR)
1343 for (i = 0; i < cnt; i++) {
1345 prom_debug("CPU %d ... ", cpu);
1346 if (cpu == prom.cpu) {
1347 prom_debug("booted !\n");
1350 prom_debug("starting ... ");
1352 /* Init the acknowledge var which will be reset by
1353 * the secondary cpu when it awakens from its OF
1357 rc = prom_rtas_call(prom_rtas_start_cpu, 3, 1,
1358 NULL, cpu, entry, data);
1359 prom_debug("rtas rc=%d ...", rc);
1361 for (j = 0; j < 100000000 && data->ack == -1; j++) {
1366 if (data->ack != -1)
1367 prom_debug("done, PIR=0x%x\n", data->ack);
1369 prom_debug("timeout !\n");
1372 prom_debug("prom_opal_hold_cpus: end...\n");
1375 static void __init prom_opal_takeover(void)
1377 struct opal_secondary_data *data = &opal_secondary_data;
1378 struct opal_takeover_args *args = &data->args;
1379 u64 align = prom_opal_align;
1380 u64 top_addr, opal_addr;
1382 args->k_image = (u64)_stext;
1383 args->k_size = _end - _stext;
1385 args->k_entry2 = 0x60;
1387 top_addr = _ALIGN_UP(args->k_size, align);
1389 if (prom_initrd_start != 0) {
1390 args->rd_image = prom_initrd_start;
1391 args->rd_size = prom_initrd_end - args->rd_image;
1392 args->rd_loc = top_addr;
1393 top_addr = _ALIGN_UP(args->rd_loc + args->rd_size, align);
1396 /* Pickup an address for the HAL. We want to go really high
1397 * up to avoid problem with future kexecs. On the other hand
1398 * we don't want to be all over the TCEs on P5IOC2 machines
1399 * which are going to be up there too. We assume the machine
1400 * has plenty of memory, and we ask for the HAL for now to
1401 * be just below the 1G point, or above the initrd
1403 opal_addr = _ALIGN_DOWN(0x40000000 - prom_opal_size, align);
1404 if (opal_addr < top_addr)
1405 opal_addr = top_addr;
1406 args->hal_addr = opal_addr;
1408 /* Copy the command line to the kernel image */
1409 strlcpy(boot_command_line, prom_cmd_line,
1412 prom_debug(" k_image = 0x%lx\n", args->k_image);
1413 prom_debug(" k_size = 0x%lx\n", args->k_size);
1414 prom_debug(" k_entry = 0x%lx\n", args->k_entry);
1415 prom_debug(" k_entry2 = 0x%lx\n", args->k_entry2);
1416 prom_debug(" hal_addr = 0x%lx\n", args->hal_addr);
1417 prom_debug(" rd_image = 0x%lx\n", args->rd_image);
1418 prom_debug(" rd_size = 0x%lx\n", args->rd_size);
1419 prom_debug(" rd_loc = 0x%lx\n", args->rd_loc);
1420 prom_printf("Performing OPAL takeover,this can take a few minutes..\n");
1425 opal_do_takeover(args);
1429 * Allocate room for and instantiate OPAL
1431 static void __init prom_instantiate_opal(void)
1436 u64 size = 0, align = 0x10000;
1439 prom_debug("prom_instantiate_opal: start...\n");
1441 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1442 prom_debug("opal_node: %x\n", opal_node);
1443 if (!PHANDLE_VALID(opal_node))
1446 prom_getprop(opal_node, "opal-runtime-size", &size, sizeof(size));
1449 prom_getprop(opal_node, "opal-runtime-alignment", &align,
1452 base = alloc_down(size, align, 0);
1454 prom_printf("OPAL allocation failed !\n");
1458 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1459 if (!IHANDLE_VALID(opal_inst)) {
1460 prom_printf("opening opal package failed (%x)\n", opal_inst);
1464 prom_printf("instantiating opal at 0x%x...", base);
1466 if (call_prom_ret("call-method", 4, 3, rets,
1467 ADDR("load-opal-runtime"),
1469 base >> 32, base & 0xffffffff) != 0
1470 || (rets[0] == 0 && rets[1] == 0)) {
1471 prom_printf(" failed\n");
1474 entry = (((u64)rets[0]) << 32) | rets[1];
1476 prom_printf(" done\n");
1478 reserve_mem(base, size);
1480 prom_debug("opal base = 0x%x\n", base);
1481 prom_debug("opal align = 0x%x\n", align);
1482 prom_debug("opal entry = 0x%x\n", entry);
1483 prom_debug("opal size = 0x%x\n", (long)size);
1485 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1486 &base, sizeof(base));
1487 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1488 &entry, sizeof(entry));
1490 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1491 prom_opal_base = base;
1492 prom_opal_entry = entry;
1494 prom_debug("prom_instantiate_opal: end...\n");
1497 #endif /* CONFIG_PPC_POWERNV */
1500 * Allocate room for and instantiate RTAS
1502 static void __init prom_instantiate_rtas(void)
1506 u32 base, entry = 0;
1509 prom_debug("prom_instantiate_rtas: start...\n");
1511 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1512 prom_debug("rtas_node: %x\n", rtas_node);
1513 if (!PHANDLE_VALID(rtas_node))
1516 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1520 base = alloc_down(size, PAGE_SIZE, 0);
1522 prom_panic("Could not allocate memory for RTAS\n");
1524 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1525 if (!IHANDLE_VALID(rtas_inst)) {
1526 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1530 prom_printf("instantiating rtas at 0x%x...", base);
1532 if (call_prom_ret("call-method", 3, 2, &entry,
1533 ADDR("instantiate-rtas"),
1534 rtas_inst, base) != 0
1536 prom_printf(" failed\n");
1539 prom_printf(" done\n");
1541 reserve_mem(base, size);
1543 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1544 &base, sizeof(base));
1545 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1546 &entry, sizeof(entry));
1548 #ifdef CONFIG_PPC_POWERNV
1549 /* PowerVN takeover hack */
1550 prom_rtas_data = base;
1551 prom_rtas_entry = entry;
1552 prom_getprop(rtas_node, "start-cpu", &prom_rtas_start_cpu, 4);
1554 prom_debug("rtas base = 0x%x\n", base);
1555 prom_debug("rtas entry = 0x%x\n", entry);
1556 prom_debug("rtas size = 0x%x\n", (long)size);
1558 prom_debug("prom_instantiate_rtas: end...\n");
1563 * Allocate room for and instantiate Stored Measurement Log (SML)
1565 static void __init prom_instantiate_sml(void)
1567 phandle ibmvtpm_node;
1568 ihandle ibmvtpm_inst;
1569 u32 entry = 0, size = 0;
1572 prom_debug("prom_instantiate_sml: start...\n");
1574 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/ibm,vtpm"));
1575 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1576 if (!PHANDLE_VALID(ibmvtpm_node))
1579 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/ibm,vtpm"));
1580 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1581 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1585 if (call_prom_ret("call-method", 2, 2, &size,
1586 ADDR("sml-get-handover-size"),
1587 ibmvtpm_inst) != 0 || size == 0) {
1588 prom_printf("SML get handover size failed\n");
1592 base = alloc_down(size, PAGE_SIZE, 0);
1594 prom_panic("Could not allocate memory for sml\n");
1596 prom_printf("instantiating sml at 0x%x...", base);
1598 if (call_prom_ret("call-method", 4, 2, &entry,
1599 ADDR("sml-handover"),
1600 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1601 prom_printf("SML handover failed\n");
1604 prom_printf(" done\n");
1606 reserve_mem(base, size);
1608 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-base",
1609 &base, sizeof(base));
1610 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-size",
1611 &size, sizeof(size));
1613 prom_debug("sml base = 0x%x\n", base);
1614 prom_debug("sml size = 0x%x\n", (long)size);
1616 prom_debug("prom_instantiate_sml: end...\n");
1620 * Allocate room for and initialize TCE tables
1622 static void __init prom_initialize_tce_table(void)
1626 char compatible[64], type[64], model[64];
1627 char *path = prom_scratch;
1629 u32 minalign, minsize;
1630 u64 tce_entry, *tce_entryp;
1631 u64 local_alloc_top, local_alloc_bottom;
1637 prom_debug("starting prom_initialize_tce_table\n");
1639 /* Cache current top of allocs so we reserve a single block */
1640 local_alloc_top = alloc_top_high;
1641 local_alloc_bottom = local_alloc_top;
1643 /* Search all nodes looking for PHBs. */
1644 for (node = 0; prom_next_node(&node); ) {
1648 prom_getprop(node, "compatible",
1649 compatible, sizeof(compatible));
1650 prom_getprop(node, "device_type", type, sizeof(type));
1651 prom_getprop(node, "model", model, sizeof(model));
1653 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1656 /* Keep the old logic intact to avoid regression. */
1657 if (compatible[0] != 0) {
1658 if ((strstr(compatible, "python") == NULL) &&
1659 (strstr(compatible, "Speedwagon") == NULL) &&
1660 (strstr(compatible, "Winnipeg") == NULL))
1662 } else if (model[0] != 0) {
1663 if ((strstr(model, "ython") == NULL) &&
1664 (strstr(model, "peedwagon") == NULL) &&
1665 (strstr(model, "innipeg") == NULL))
1669 if (prom_getprop(node, "tce-table-minalign", &minalign,
1670 sizeof(minalign)) == PROM_ERROR)
1672 if (prom_getprop(node, "tce-table-minsize", &minsize,
1673 sizeof(minsize)) == PROM_ERROR)
1674 minsize = 4UL << 20;
1677 * Even though we read what OF wants, we just set the table
1678 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1679 * By doing this, we avoid the pitfalls of trying to DMA to
1680 * MMIO space and the DMA alias hole.
1682 * On POWER4, firmware sets the TCE region by assuming
1683 * each TCE table is 8MB. Using this memory for anything
1684 * else will impact performance, so we always allocate 8MB.
1687 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1688 minsize = 8UL << 20;
1690 minsize = 4UL << 20;
1692 /* Align to the greater of the align or size */
1693 align = max(minalign, minsize);
1694 base = alloc_down(minsize, align, 1);
1696 prom_panic("ERROR, cannot find space for TCE table.\n");
1697 if (base < local_alloc_bottom)
1698 local_alloc_bottom = base;
1700 /* It seems OF doesn't null-terminate the path :-( */
1701 memset(path, 0, PROM_SCRATCH_SIZE);
1702 /* Call OF to setup the TCE hardware */
1703 if (call_prom("package-to-path", 3, 1, node,
1704 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1705 prom_printf("package-to-path failed\n");
1708 /* Save away the TCE table attributes for later use. */
1709 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1710 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1712 prom_debug("TCE table: %s\n", path);
1713 prom_debug("\tnode = 0x%x\n", node);
1714 prom_debug("\tbase = 0x%x\n", base);
1715 prom_debug("\tsize = 0x%x\n", minsize);
1717 /* Initialize the table to have a one-to-one mapping
1718 * over the allocated size.
1720 tce_entryp = (u64 *)base;
1721 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1722 tce_entry = (i << PAGE_SHIFT);
1724 *tce_entryp = tce_entry;
1727 prom_printf("opening PHB %s", path);
1728 phb_node = call_prom("open", 1, 1, path);
1730 prom_printf("... failed\n");
1732 prom_printf("... done\n");
1734 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1735 phb_node, -1, minsize,
1736 (u32) base, (u32) (base >> 32));
1737 call_prom("close", 1, 0, phb_node);
1740 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1742 /* These are only really needed if there is a memory limit in
1743 * effect, but we don't know so export them always. */
1744 prom_tce_alloc_start = local_alloc_bottom;
1745 prom_tce_alloc_end = local_alloc_top;
1747 /* Flag the first invalid entry */
1748 prom_debug("ending prom_initialize_tce_table\n");
1753 * With CHRP SMP we need to use the OF to start the other processors.
1754 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1755 * so we have to put the processors into a holding pattern controlled
1756 * by the kernel (not OF) before we destroy the OF.
1758 * This uses a chunk of low memory, puts some holding pattern
1759 * code there and sends the other processors off to there until
1760 * smp_boot_cpus tells them to do something. The holding pattern
1761 * checks that address until its cpu # is there, when it is that
1762 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1763 * of setting those values.
1765 * We also use physical address 0x4 here to tell when a cpu
1766 * is in its holding pattern code.
1771 * We want to reference the copy of __secondary_hold_* in the
1772 * 0 - 0x100 address range
1774 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1776 static void __init prom_hold_cpus(void)
1782 unsigned long *spinloop
1783 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1784 unsigned long *acknowledge
1785 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1786 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1788 prom_debug("prom_hold_cpus: start...\n");
1789 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1790 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1791 prom_debug(" 1) acknowledge = 0x%x\n",
1792 (unsigned long)acknowledge);
1793 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1794 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1796 /* Set the common spinloop variable, so all of the secondary cpus
1797 * will block when they are awakened from their OF spinloop.
1798 * This must occur for both SMP and non SMP kernels, since OF will
1799 * be trashed when we move the kernel.
1804 for (node = 0; prom_next_node(&node); ) {
1806 prom_getprop(node, "device_type", type, sizeof(type));
1807 if (strcmp(type, "cpu") != 0)
1810 /* Skip non-configured cpus. */
1811 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1812 if (strcmp(type, "okay") != 0)
1816 prom_getprop(node, "reg", ®, sizeof(reg));
1818 prom_debug("cpu hw idx = %lu\n", reg);
1820 /* Init the acknowledge var which will be reset by
1821 * the secondary cpu when it awakens from its OF
1824 *acknowledge = (unsigned long)-1;
1826 if (reg != prom.cpu) {
1827 /* Primary Thread of non-boot cpu or any thread */
1828 prom_printf("starting cpu hw idx %lu... ", reg);
1829 call_prom("start-cpu", 3, 0, node,
1830 secondary_hold, reg);
1832 for (i = 0; (i < 100000000) &&
1833 (*acknowledge == ((unsigned long)-1)); i++ )
1836 if (*acknowledge == reg)
1837 prom_printf("done\n");
1839 prom_printf("failed: %x\n", *acknowledge);
1843 prom_printf("boot cpu hw idx %lu\n", reg);
1844 #endif /* CONFIG_SMP */
1847 prom_debug("prom_hold_cpus: end...\n");
1851 static void __init prom_init_client_services(unsigned long pp)
1853 /* Get a handle to the prom entry point before anything else */
1856 /* get a handle for the stdout device */
1857 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1858 if (!PHANDLE_VALID(prom.chosen))
1859 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1861 /* get device tree root */
1862 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1863 if (!PHANDLE_VALID(prom.root))
1864 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1871 * For really old powermacs, we need to map things we claim.
1872 * For that, we need the ihandle of the mmu.
1873 * Also, on the longtrail, we need to work around other bugs.
1875 static void __init prom_find_mmu(void)
1880 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1881 if (!PHANDLE_VALID(oprom))
1883 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1885 version[sizeof(version) - 1] = 0;
1886 /* XXX might need to add other versions here */
1887 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1888 of_workarounds = OF_WA_CLAIM;
1889 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1890 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1891 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1894 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1895 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1896 sizeof(prom.mmumap));
1897 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1898 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1901 #define prom_find_mmu()
1904 static void __init prom_init_stdout(void)
1906 char *path = of_stdout_device;
1910 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1911 prom_panic("cannot find stdout");
1915 /* Get the full OF pathname of the stdout device */
1916 memset(path, 0, 256);
1917 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1918 val = call_prom("instance-to-package", 1, 1, prom.stdout);
1919 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1921 prom_printf("OF stdout device is: %s\n", of_stdout_device);
1922 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1923 path, strlen(path) + 1);
1925 /* If it's a display, note it */
1926 memset(type, 0, sizeof(type));
1927 prom_getprop(val, "device_type", type, sizeof(type));
1928 if (strcmp(type, "display") == 0)
1929 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1932 static int __init prom_find_machine_type(void)
1941 /* Look for a PowerMac or a Cell */
1942 len = prom_getprop(prom.root, "compatible",
1943 compat, sizeof(compat)-1);
1947 char *p = &compat[i];
1951 if (strstr(p, "Power Macintosh") ||
1952 strstr(p, "MacRISC"))
1953 return PLATFORM_POWERMAC;
1955 /* We must make sure we don't detect the IBM Cell
1956 * blades as pSeries due to some firmware issues,
1959 if (strstr(p, "IBM,CBEA") ||
1960 strstr(p, "IBM,CPBW-1.0"))
1961 return PLATFORM_GENERIC;
1962 #endif /* CONFIG_PPC64 */
1967 /* Try to detect OPAL */
1968 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1969 return PLATFORM_OPAL;
1971 /* Try to figure out if it's an IBM pSeries or any other
1972 * PAPR compliant platform. We assume it is if :
1973 * - /device_type is "chrp" (please, do NOT use that for future
1977 len = prom_getprop(prom.root, "device_type",
1978 compat, sizeof(compat)-1);
1980 return PLATFORM_GENERIC;
1981 if (strcmp(compat, "chrp"))
1982 return PLATFORM_GENERIC;
1984 /* Default to pSeries. We need to know if we are running LPAR */
1985 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1986 if (!PHANDLE_VALID(rtas))
1987 return PLATFORM_GENERIC;
1988 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1989 if (x != PROM_ERROR) {
1990 prom_debug("Hypertas detected, assuming LPAR !\n");
1991 return PLATFORM_PSERIES_LPAR;
1993 return PLATFORM_PSERIES;
1995 return PLATFORM_GENERIC;
1999 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2001 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2005 * If we have a display that we don't know how to drive,
2006 * we will want to try to execute OF's open method for it
2007 * later. However, OF will probably fall over if we do that
2008 * we've taken over the MMU.
2009 * So we check whether we will need to open the display,
2010 * and if so, open it now.
2012 static void __init prom_check_displays(void)
2014 char type[16], *path;
2019 static unsigned char default_colors[] = {
2037 const unsigned char *clut;
2039 prom_debug("Looking for displays\n");
2040 for (node = 0; prom_next_node(&node); ) {
2041 memset(type, 0, sizeof(type));
2042 prom_getprop(node, "device_type", type, sizeof(type));
2043 if (strcmp(type, "display") != 0)
2046 /* It seems OF doesn't null-terminate the path :-( */
2047 path = prom_scratch;
2048 memset(path, 0, PROM_SCRATCH_SIZE);
2051 * leave some room at the end of the path for appending extra
2054 if (call_prom("package-to-path", 3, 1, node, path,
2055 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
2057 prom_printf("found display : %s, opening... ", path);
2059 ih = call_prom("open", 1, 1, path);
2061 prom_printf("failed\n");
2066 prom_printf("done\n");
2067 prom_setprop(node, path, "linux,opened", NULL, 0);
2069 /* Setup a usable color table when the appropriate
2070 * method is available. Should update this to set-colors */
2071 clut = default_colors;
2072 for (i = 0; i < 16; i++, clut += 3)
2073 if (prom_set_color(ih, i, clut[0], clut[1],
2077 #ifdef CONFIG_LOGO_LINUX_CLUT224
2078 clut = PTRRELOC(logo_linux_clut224.clut);
2079 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2080 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2083 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2088 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2089 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2090 unsigned long needed, unsigned long align)
2094 *mem_start = _ALIGN(*mem_start, align);
2095 while ((*mem_start + needed) > *mem_end) {
2096 unsigned long room, chunk;
2098 prom_debug("Chunk exhausted, claiming more at %x...\n",
2100 room = alloc_top - alloc_bottom;
2101 if (room > DEVTREE_CHUNK_SIZE)
2102 room = DEVTREE_CHUNK_SIZE;
2103 if (room < PAGE_SIZE)
2104 prom_panic("No memory for flatten_device_tree "
2106 chunk = alloc_up(room, 0);
2108 prom_panic("No memory for flatten_device_tree "
2109 "(claim failed)\n");
2110 *mem_end = chunk + room;
2113 ret = (void *)*mem_start;
2114 *mem_start += needed;
2119 #define dt_push_token(token, mem_start, mem_end) \
2120 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
2122 static unsigned long __init dt_find_string(char *str)
2126 s = os = (char *)dt_string_start;
2128 while (s < (char *)dt_string_end) {
2129 if (strcmp(s, str) == 0)
2137 * The Open Firmware 1275 specification states properties must be 31 bytes or
2138 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2140 #define MAX_PROPERTY_NAME 64
2142 static void __init scan_dt_build_strings(phandle node,
2143 unsigned long *mem_start,
2144 unsigned long *mem_end)
2146 char *prev_name, *namep, *sstart;
2150 sstart = (char *)dt_string_start;
2152 /* get and store all property names */
2155 /* 64 is max len of name including nul. */
2156 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2157 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2158 /* No more nodes: unwind alloc */
2159 *mem_start = (unsigned long)namep;
2164 if (strcmp(namep, "name") == 0) {
2165 *mem_start = (unsigned long)namep;
2169 /* get/create string entry */
2170 soff = dt_find_string(namep);
2172 *mem_start = (unsigned long)namep;
2173 namep = sstart + soff;
2175 /* Trim off some if we can */
2176 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2177 dt_string_end = *mem_start;
2182 /* do all our children */
2183 child = call_prom("child", 1, 1, node);
2184 while (child != 0) {
2185 scan_dt_build_strings(child, mem_start, mem_end);
2186 child = call_prom("peer", 1, 1, child);
2190 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2191 unsigned long *mem_end)
2194 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2196 unsigned char *valp;
2197 static char pname[MAX_PROPERTY_NAME];
2198 int l, room, has_phandle = 0;
2200 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2202 /* get the node's full name */
2203 namep = (char *)*mem_start;
2204 room = *mem_end - *mem_start;
2207 l = call_prom("package-to-path", 3, 1, node, namep, room);
2209 /* Didn't fit? Get more room. */
2211 if (l >= *mem_end - *mem_start)
2212 namep = make_room(mem_start, mem_end, l+1, 1);
2213 call_prom("package-to-path", 3, 1, node, namep, l);
2217 /* Fixup an Apple bug where they have bogus \0 chars in the
2218 * middle of the path in some properties, and extract
2219 * the unit name (everything after the last '/').
2221 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2228 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2231 /* get it again for debugging */
2232 path = prom_scratch;
2233 memset(path, 0, PROM_SCRATCH_SIZE);
2234 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2236 /* get and store all properties */
2238 sstart = (char *)dt_string_start;
2240 if (call_prom("nextprop", 3, 1, node, prev_name,
2245 if (strcmp(pname, "name") == 0) {
2250 /* find string offset */
2251 soff = dt_find_string(pname);
2253 prom_printf("WARNING: Can't find string index for"
2254 " <%s>, node %s\n", pname, path);
2257 prev_name = sstart + soff;
2260 l = call_prom("getproplen", 2, 1, node, pname);
2263 if (l == PROM_ERROR)
2266 /* push property head */
2267 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2268 dt_push_token(l, mem_start, mem_end);
2269 dt_push_token(soff, mem_start, mem_end);
2271 /* push property content */
2272 valp = make_room(mem_start, mem_end, l, 4);
2273 call_prom("getprop", 4, 1, node, pname, valp, l);
2274 *mem_start = _ALIGN(*mem_start, 4);
2276 if (!strcmp(pname, "phandle"))
2280 /* Add a "linux,phandle" property if no "phandle" property already
2281 * existed (can happen with OPAL)
2284 soff = dt_find_string("linux,phandle");
2286 prom_printf("WARNING: Can't find string index for"
2287 " <linux-phandle> node %s\n", path);
2289 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2290 dt_push_token(4, mem_start, mem_end);
2291 dt_push_token(soff, mem_start, mem_end);
2292 valp = make_room(mem_start, mem_end, 4, 4);
2293 *(u32 *)valp = node;
2297 /* do all our children */
2298 child = call_prom("child", 1, 1, node);
2299 while (child != 0) {
2300 scan_dt_build_struct(child, mem_start, mem_end);
2301 child = call_prom("peer", 1, 1, child);
2304 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2307 static void __init flatten_device_tree(void)
2310 unsigned long mem_start, mem_end, room;
2311 struct boot_param_header *hdr;
2316 * Check how much room we have between alloc top & bottom (+/- a
2317 * few pages), crop to 1MB, as this is our "chunk" size
2319 room = alloc_top - alloc_bottom - 0x4000;
2320 if (room > DEVTREE_CHUNK_SIZE)
2321 room = DEVTREE_CHUNK_SIZE;
2322 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2324 /* Now try to claim that */
2325 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2327 prom_panic("Can't allocate initial device-tree chunk\n");
2328 mem_end = mem_start + room;
2330 /* Get root of tree */
2331 root = call_prom("peer", 1, 1, (phandle)0);
2332 if (root == (phandle)0)
2333 prom_panic ("couldn't get device tree root\n");
2335 /* Build header and make room for mem rsv map */
2336 mem_start = _ALIGN(mem_start, 4);
2337 hdr = make_room(&mem_start, &mem_end,
2338 sizeof(struct boot_param_header), 4);
2339 dt_header_start = (unsigned long)hdr;
2340 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2342 /* Start of strings */
2343 mem_start = PAGE_ALIGN(mem_start);
2344 dt_string_start = mem_start;
2345 mem_start += 4; /* hole */
2347 /* Add "linux,phandle" in there, we'll need it */
2348 namep = make_room(&mem_start, &mem_end, 16, 1);
2349 strcpy(namep, "linux,phandle");
2350 mem_start = (unsigned long)namep + strlen(namep) + 1;
2352 /* Build string array */
2353 prom_printf("Building dt strings...\n");
2354 scan_dt_build_strings(root, &mem_start, &mem_end);
2355 dt_string_end = mem_start;
2357 /* Build structure */
2358 mem_start = PAGE_ALIGN(mem_start);
2359 dt_struct_start = mem_start;
2360 prom_printf("Building dt structure...\n");
2361 scan_dt_build_struct(root, &mem_start, &mem_end);
2362 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2363 dt_struct_end = PAGE_ALIGN(mem_start);
2366 hdr->boot_cpuid_phys = prom.cpu;
2367 hdr->magic = OF_DT_HEADER;
2368 hdr->totalsize = dt_struct_end - dt_header_start;
2369 hdr->off_dt_struct = dt_struct_start - dt_header_start;
2370 hdr->off_dt_strings = dt_string_start - dt_header_start;
2371 hdr->dt_strings_size = dt_string_end - dt_string_start;
2372 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - dt_header_start;
2373 hdr->version = OF_DT_VERSION;
2374 /* Version 16 is not backward compatible */
2375 hdr->last_comp_version = 0x10;
2377 /* Copy the reserve map in */
2378 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2383 prom_printf("reserved memory map:\n");
2384 for (i = 0; i < mem_reserve_cnt; i++)
2385 prom_printf(" %x - %x\n",
2386 mem_reserve_map[i].base,
2387 mem_reserve_map[i].size);
2390 /* Bump mem_reserve_cnt to cause further reservations to fail
2391 * since it's too late.
2393 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2395 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2396 dt_string_start, dt_string_end);
2397 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2398 dt_struct_start, dt_struct_end);
2402 #ifdef CONFIG_PPC_MAPLE
2403 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2404 * The values are bad, and it doesn't even have the right number of cells. */
2405 static void __init fixup_device_tree_maple(void)
2408 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2412 name = "/ht@0/isa@4";
2413 isa = call_prom("finddevice", 1, 1, ADDR(name));
2414 if (!PHANDLE_VALID(isa)) {
2415 name = "/ht@0/isa@6";
2416 isa = call_prom("finddevice", 1, 1, ADDR(name));
2417 rloc = 0x01003000; /* IO space; PCI device = 6 */
2419 if (!PHANDLE_VALID(isa))
2422 if (prom_getproplen(isa, "ranges") != 12)
2424 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2428 if (isa_ranges[0] != 0x1 ||
2429 isa_ranges[1] != 0xf4000000 ||
2430 isa_ranges[2] != 0x00010000)
2433 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2435 isa_ranges[0] = 0x1;
2436 isa_ranges[1] = 0x0;
2437 isa_ranges[2] = rloc;
2438 isa_ranges[3] = 0x0;
2439 isa_ranges[4] = 0x0;
2440 isa_ranges[5] = 0x00010000;
2441 prom_setprop(isa, name, "ranges",
2442 isa_ranges, sizeof(isa_ranges));
2445 #define CPC925_MC_START 0xf8000000
2446 #define CPC925_MC_LENGTH 0x1000000
2447 /* The values for memory-controller don't have right number of cells */
2448 static void __init fixup_device_tree_maple_memory_controller(void)
2452 char *name = "/hostbridge@f8000000";
2455 mc = call_prom("finddevice", 1, 1, ADDR(name));
2456 if (!PHANDLE_VALID(mc))
2459 if (prom_getproplen(mc, "reg") != 8)
2462 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2463 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2464 if ((ac != 2) || (sc != 2))
2467 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2470 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2473 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2476 mc_reg[1] = CPC925_MC_START;
2478 mc_reg[3] = CPC925_MC_LENGTH;
2479 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2482 #define fixup_device_tree_maple()
2483 #define fixup_device_tree_maple_memory_controller()
2486 #ifdef CONFIG_PPC_CHRP
2488 * Pegasos and BriQ lacks the "ranges" property in the isa node
2489 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2490 * Pegasos has the IDE configured in legacy mode, but advertised as native
2492 static void __init fixup_device_tree_chrp(void)
2496 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2500 name = "/pci@80000000/isa@c";
2501 ph = call_prom("finddevice", 1, 1, ADDR(name));
2502 if (!PHANDLE_VALID(ph)) {
2503 name = "/pci@ff500000/isa@6";
2504 ph = call_prom("finddevice", 1, 1, ADDR(name));
2505 rloc = 0x01003000; /* IO space; PCI device = 6 */
2507 if (PHANDLE_VALID(ph)) {
2508 rc = prom_getproplen(ph, "ranges");
2509 if (rc == 0 || rc == PROM_ERROR) {
2510 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2517 prop[5] = 0x00010000;
2518 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2522 name = "/pci@80000000/ide@C,1";
2523 ph = call_prom("finddevice", 1, 1, ADDR(name));
2524 if (PHANDLE_VALID(ph)) {
2525 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2528 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2529 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2530 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2531 if (rc == sizeof(u32)) {
2533 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2538 #define fixup_device_tree_chrp()
2541 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2542 static void __init fixup_device_tree_pmac(void)
2544 phandle u3, i2c, mpic;
2549 /* Some G5s have a missing interrupt definition, fix it up here */
2550 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2551 if (!PHANDLE_VALID(u3))
2553 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2554 if (!PHANDLE_VALID(i2c))
2556 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2557 if (!PHANDLE_VALID(mpic))
2560 /* check if proper rev of u3 */
2561 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2564 if (u3_rev < 0x35 || u3_rev > 0x39)
2566 /* does it need fixup ? */
2567 if (prom_getproplen(i2c, "interrupts") > 0)
2570 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2572 /* interrupt on this revision of u3 is number 0 and level */
2575 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2576 &interrupts, sizeof(interrupts));
2578 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2579 &parent, sizeof(parent));
2582 #define fixup_device_tree_pmac()
2585 #ifdef CONFIG_PPC_EFIKA
2587 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2588 * to talk to the phy. If the phy-handle property is missing, then this
2589 * function is called to add the appropriate nodes and link it to the
2592 static void __init fixup_device_tree_efika_add_phy(void)
2598 /* Check if /builtin/ethernet exists - bail if it doesn't */
2599 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2600 if (!PHANDLE_VALID(node))
2603 /* Check if the phy-handle property exists - bail if it does */
2604 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2609 * At this point the ethernet device doesn't have a phy described.
2610 * Now we need to add the missing phy node and linkage
2613 /* Check for an MDIO bus node - if missing then create one */
2614 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2615 if (!PHANDLE_VALID(node)) {
2616 prom_printf("Adding Ethernet MDIO node\n");
2617 call_prom("interpret", 1, 1,
2618 " s\" /builtin\" find-device"
2620 " 1 encode-int s\" #address-cells\" property"
2621 " 0 encode-int s\" #size-cells\" property"
2622 " s\" mdio\" device-name"
2623 " s\" fsl,mpc5200b-mdio\" encode-string"
2624 " s\" compatible\" property"
2625 " 0xf0003000 0x400 reg"
2627 " 0x5 encode-int encode+"
2628 " 0x3 encode-int encode+"
2629 " s\" interrupts\" property"
2633 /* Check for a PHY device node - if missing then create one and
2634 * give it's phandle to the ethernet node */
2635 node = call_prom("finddevice", 1, 1,
2636 ADDR("/builtin/mdio/ethernet-phy"));
2637 if (!PHANDLE_VALID(node)) {
2638 prom_printf("Adding Ethernet PHY node\n");
2639 call_prom("interpret", 1, 1,
2640 " s\" /builtin/mdio\" find-device"
2642 " s\" ethernet-phy\" device-name"
2643 " 0x10 encode-int s\" reg\" property"
2647 " s\" /builtin/ethernet\" find-device"
2649 " s\" phy-handle\" property"
2654 static void __init fixup_device_tree_efika(void)
2656 int sound_irq[3] = { 2, 2, 0 };
2657 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2658 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2659 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2660 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2665 /* Check if we're really running on a EFIKA */
2666 node = call_prom("finddevice", 1, 1, ADDR("/"));
2667 if (!PHANDLE_VALID(node))
2670 rv = prom_getprop(node, "model", prop, sizeof(prop));
2671 if (rv == PROM_ERROR)
2673 if (strcmp(prop, "EFIKA5K2"))
2676 prom_printf("Applying EFIKA device tree fixups\n");
2678 /* Claiming to be 'chrp' is death */
2679 node = call_prom("finddevice", 1, 1, ADDR("/"));
2680 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2681 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2682 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2684 /* CODEGEN,description is exposed in /proc/cpuinfo so
2686 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2687 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2688 prom_setprop(node, "/", "CODEGEN,description",
2689 "Efika 5200B PowerPC System",
2690 sizeof("Efika 5200B PowerPC System"));
2692 /* Fixup bestcomm interrupts property */
2693 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2694 if (PHANDLE_VALID(node)) {
2695 len = prom_getproplen(node, "interrupts");
2697 prom_printf("Fixing bestcomm interrupts property\n");
2698 prom_setprop(node, "/builtin/bestcom", "interrupts",
2699 bcomm_irq, sizeof(bcomm_irq));
2703 /* Fixup sound interrupts property */
2704 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2705 if (PHANDLE_VALID(node)) {
2706 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2707 if (rv == PROM_ERROR) {
2708 prom_printf("Adding sound interrupts property\n");
2709 prom_setprop(node, "/builtin/sound", "interrupts",
2710 sound_irq, sizeof(sound_irq));
2714 /* Make sure ethernet phy-handle property exists */
2715 fixup_device_tree_efika_add_phy();
2718 #define fixup_device_tree_efika()
2721 static void __init fixup_device_tree(void)
2723 fixup_device_tree_maple();
2724 fixup_device_tree_maple_memory_controller();
2725 fixup_device_tree_chrp();
2726 fixup_device_tree_pmac();
2727 fixup_device_tree_efika();
2730 static void __init prom_find_boot_cpu(void)
2737 if (prom_getprop(prom.chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2740 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2742 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2743 prom.cpu = getprop_rval;
2745 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2748 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2750 #ifdef CONFIG_BLK_DEV_INITRD
2751 if (r3 && r4 && r4 != 0xdeadbeef) {
2754 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2755 prom_initrd_end = prom_initrd_start + r4;
2757 val = prom_initrd_start;
2758 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2760 val = prom_initrd_end;
2761 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2764 reserve_mem(prom_initrd_start,
2765 prom_initrd_end - prom_initrd_start);
2767 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2768 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2770 #endif /* CONFIG_BLK_DEV_INITRD */
2774 #ifdef CONFIG_RELOCATABLE
2775 static void reloc_toc(void)
2779 static void unreloc_toc(void)
2783 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
2786 unsigned long *toc_entry;
2788 /* Get the start of the TOC by using r2 directly. */
2789 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
2791 for (i = 0; i < nr_entries; i++) {
2792 *toc_entry = *toc_entry + offset;
2797 static void reloc_toc(void)
2799 unsigned long offset = reloc_offset();
2800 unsigned long nr_entries =
2801 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2803 __reloc_toc(offset, nr_entries);
2808 static void unreloc_toc(void)
2810 unsigned long offset = reloc_offset();
2811 unsigned long nr_entries =
2812 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2816 __reloc_toc(-offset, nr_entries);
2822 * We enter here early on, when the Open Firmware prom is still
2823 * handling exceptions and the MMU hash table for us.
2826 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2828 unsigned long r6, unsigned long r7,
2829 unsigned long kbase)
2834 unsigned long offset = reloc_offset();
2841 * First zero the BSS
2843 memset(&__bss_start, 0, __bss_stop - __bss_start);
2846 * Init interface to Open Firmware, get some node references,
2849 prom_init_client_services(pp);
2852 * See if this OF is old enough that we need to do explicit maps
2853 * and other workarounds
2858 * Init prom stdout device
2862 prom_printf("Preparing to boot %s", linux_banner);
2865 * Get default machine type. At this point, we do not differentiate
2866 * between pSeries SMP and pSeries LPAR
2868 of_platform = prom_find_machine_type();
2869 prom_printf("Detected machine type: %x\n", of_platform);
2871 #ifndef CONFIG_NONSTATIC_KERNEL
2872 /* Bail if this is a kdump kernel. */
2873 if (PHYSICAL_START > 0)
2874 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2878 * Check for an initrd
2880 prom_check_initrd(r3, r4);
2882 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2884 * On pSeries, inform the firmware about our capabilities
2886 if (of_platform == PLATFORM_PSERIES ||
2887 of_platform == PLATFORM_PSERIES_LPAR)
2888 prom_send_capabilities();
2892 * Copy the CPU hold code
2894 if (of_platform != PLATFORM_POWERMAC)
2895 copy_and_flush(0, kbase, 0x100, 0);
2898 * Do early parsing of command line
2900 early_cmdline_parse();
2903 * Initialize memory management within prom_init
2908 * Determine which cpu is actually running right _now_
2910 prom_find_boot_cpu();
2913 * Initialize display devices
2915 prom_check_displays();
2919 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2920 * that uses the allocator, we need to make sure we get the top of memory
2921 * available for us here...
2923 if (of_platform == PLATFORM_PSERIES)
2924 prom_initialize_tce_table();
2928 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2929 * have a usable RTAS implementation.
2931 if (of_platform != PLATFORM_POWERMAC &&
2932 of_platform != PLATFORM_OPAL)
2933 prom_instantiate_rtas();
2935 #ifdef CONFIG_PPC_POWERNV
2936 /* Detect HAL and try instanciating it & doing takeover */
2937 if (of_platform == PLATFORM_PSERIES_LPAR) {
2939 if (of_platform == PLATFORM_OPAL) {
2940 prom_opal_hold_cpus();
2941 prom_opal_takeover();
2943 } else if (of_platform == PLATFORM_OPAL)
2944 prom_instantiate_opal();
2948 /* instantiate sml */
2949 prom_instantiate_sml();
2953 * On non-powermacs, put all CPUs in spin-loops.
2955 * PowerMacs use a different mechanism to spin CPUs
2957 if (of_platform != PLATFORM_POWERMAC &&
2958 of_platform != PLATFORM_OPAL)
2962 * Fill in some infos for use by the kernel later on
2964 if (prom_memory_limit)
2965 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
2967 sizeof(prom_memory_limit));
2970 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
2973 if (prom_iommu_force_on)
2974 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
2977 if (prom_tce_alloc_start) {
2978 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
2979 &prom_tce_alloc_start,
2980 sizeof(prom_tce_alloc_start));
2981 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
2982 &prom_tce_alloc_end,
2983 sizeof(prom_tce_alloc_end));
2988 * Fixup any known bugs in the device-tree
2990 fixup_device_tree();
2993 * Now finally create the flattened device-tree
2995 prom_printf("copying OF device tree...\n");
2996 flatten_device_tree();
2999 * in case stdin is USB and still active on IBM machines...
3000 * Unfortunately quiesce crashes on some powermacs if we have
3001 * closed stdin already (in particular the powerbook 101). It
3002 * appears that the OPAL version of OFW doesn't like it either.
3004 if (of_platform != PLATFORM_POWERMAC &&
3005 of_platform != PLATFORM_OPAL)
3009 * Call OF "quiesce" method to shut down pending DMA's from
3012 prom_printf("Calling quiesce...\n");
3013 call_prom("quiesce", 0, 0);
3016 * And finally, call the kernel passing it the flattened device
3017 * tree and NULL as r5, thus triggering the new entry point which
3018 * is common to us and kexec
3020 hdr = dt_header_start;
3022 /* Don't print anything after quiesce under OPAL, it crashes OFW */
3023 if (of_platform != PLATFORM_OPAL) {
3024 prom_printf("returning from prom_init\n");
3025 prom_debug("->dt_header_start=0x%x\n", hdr);
3029 reloc_got2(-offset);
3034 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3035 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3036 __start(hdr, kbase, 0, 0, 0,
3037 prom_opal_base, prom_opal_entry);
3039 __start(hdr, kbase, 0, 0, 0, 0, 0);