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>
40 #include <asm/iommu.h>
41 #include <asm/btext.h>
42 #include <asm/sections.h>
43 #include <asm/machdep.h>
46 #include <linux/linux_logo.h>
49 * Eventually bump that one up
51 #define DEVTREE_CHUNK_SIZE 0x100000
54 * This is the size of the local memory reserve map that gets copied
55 * into the boot params passed to the kernel. That size is totally
56 * flexible as the kernel just reads the list until it encounters an
57 * entry with size 0, so it can be changed without breaking binary
60 #define MEM_RESERVE_MAP_SIZE 8
63 * prom_init() is called very early on, before the kernel text
64 * and data have been mapped to KERNELBASE. At this point the code
65 * is running at whatever address it has been loaded at.
66 * On ppc32 we compile with -mrelocatable, which means that references
67 * to extern and static variables get relocated automatically.
68 * ppc64 objects are always relocatable, we just need to relocate the
71 * Because OF may have mapped I/O devices into the area starting at
72 * KERNELBASE, particularly on CHRP machines, we can't safely call
73 * OF once the kernel has been mapped to KERNELBASE. Therefore all
74 * OF calls must be done within prom_init().
76 * ADDR is used in calls to call_prom. The 4th and following
77 * arguments to call_prom should be 32-bit values.
78 * On ppc64, 64 bit values are truncated to 32 bits (and
79 * fortunately don't get interpreted as two arguments).
81 #define ADDR(x) (u32)(unsigned long)(x)
84 #define OF_WORKAROUNDS 0
86 #define OF_WORKAROUNDS of_workarounds
90 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
91 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
93 #define PROM_BUG() do { \
94 prom_printf("kernel BUG at %s line 0x%x!\n", \
95 __FILE__, __LINE__); \
96 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
100 #define prom_debug(x...) prom_printf(x)
102 #define prom_debug(x...)
106 typedef u32 prom_arg_t;
124 struct mem_map_entry {
129 typedef __be32 cell_t;
131 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
132 unsigned long r6, unsigned long r7, unsigned long r8,
136 extern int enter_prom(struct prom_args *args, unsigned long entry);
138 static inline int enter_prom(struct prom_args *args, unsigned long entry)
140 return ((int (*)(struct prom_args *))entry)(args);
144 extern void copy_and_flush(unsigned long dest, unsigned long src,
145 unsigned long size, unsigned long offset);
148 static struct prom_t __initdata prom;
150 static unsigned long prom_entry __initdata;
152 #define PROM_SCRATCH_SIZE 256
154 static char __initdata of_stdout_device[256];
155 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
157 static unsigned long __initdata dt_header_start;
158 static unsigned long __initdata dt_struct_start, dt_struct_end;
159 static unsigned long __initdata dt_string_start, dt_string_end;
161 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
164 static int __initdata prom_iommu_force_on;
165 static int __initdata prom_iommu_off;
166 static unsigned long __initdata prom_tce_alloc_start;
167 static unsigned long __initdata prom_tce_alloc_end;
170 /* Platforms codes are now obsolete in the kernel. Now only used within this
171 * file and ultimately gone too. Feel free to change them if you need, they
172 * are not shared with anything outside of this file anymore
174 #define PLATFORM_PSERIES 0x0100
175 #define PLATFORM_PSERIES_LPAR 0x0101
176 #define PLATFORM_LPAR 0x0001
177 #define PLATFORM_POWERMAC 0x0400
178 #define PLATFORM_GENERIC 0x0500
179 #define PLATFORM_OPAL 0x0600
181 static int __initdata of_platform;
183 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
185 static unsigned long __initdata prom_memory_limit;
187 static unsigned long __initdata alloc_top;
188 static unsigned long __initdata alloc_top_high;
189 static unsigned long __initdata alloc_bottom;
190 static unsigned long __initdata rmo_top;
191 static unsigned long __initdata ram_top;
193 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
194 static int __initdata mem_reserve_cnt;
196 static cell_t __initdata regbuf[1024];
198 static bool rtas_has_query_cpu_stopped;
202 * Error results ... some OF calls will return "-1" on error, some
203 * will return 0, some will return either. To simplify, here are
204 * macros to use with any ihandle or phandle return value to check if
208 #define PROM_ERROR (-1u)
209 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
210 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
213 /* This is the one and *ONLY* place where we actually call open
217 static int __init call_prom(const char *service, int nargs, int nret, ...)
220 struct prom_args args;
223 args.service = cpu_to_be32(ADDR(service));
224 args.nargs = cpu_to_be32(nargs);
225 args.nret = cpu_to_be32(nret);
227 va_start(list, nret);
228 for (i = 0; i < nargs; i++)
229 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
232 for (i = 0; i < nret; i++)
233 args.args[nargs+i] = 0;
235 if (enter_prom(&args, prom_entry) < 0)
238 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
241 static int __init call_prom_ret(const char *service, int nargs, int nret,
242 prom_arg_t *rets, ...)
245 struct prom_args args;
248 args.service = cpu_to_be32(ADDR(service));
249 args.nargs = cpu_to_be32(nargs);
250 args.nret = cpu_to_be32(nret);
252 va_start(list, rets);
253 for (i = 0; i < nargs; i++)
254 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
257 for (i = 0; i < nret; i++)
258 args.args[nargs+i] = 0;
260 if (enter_prom(&args, prom_entry) < 0)
264 for (i = 1; i < nret; ++i)
265 rets[i-1] = be32_to_cpu(args.args[nargs+i]);
267 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
271 static void __init prom_print(const char *msg)
275 if (prom.stdout == 0)
278 for (p = msg; *p != 0; p = q) {
279 for (q = p; *q != 0 && *q != '\n'; ++q)
282 call_prom("write", 3, 1, prom.stdout, p, q - p);
286 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2);
291 static void __init prom_print_hex(unsigned long val)
293 int i, nibbles = sizeof(val)*2;
294 char buf[sizeof(val)*2+1];
296 for (i = nibbles-1; i >= 0; i--) {
297 buf[i] = (val & 0xf) + '0';
299 buf[i] += ('a'-'0'-10);
303 call_prom("write", 3, 1, prom.stdout, buf, nibbles);
306 /* max number of decimal digits in an unsigned long */
308 static void __init prom_print_dec(unsigned long val)
311 char buf[UL_DIGITS+1];
313 for (i = UL_DIGITS-1; i >= 0; i--) {
314 buf[i] = (val % 10) + '0';
319 /* shift stuff down */
320 size = UL_DIGITS - i;
321 call_prom("write", 3, 1, prom.stdout, buf+i, size);
324 static void __init prom_printf(const char *format, ...)
326 const char *p, *q, *s;
331 va_start(args, format);
332 for (p = format; *p != 0; p = q) {
333 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
336 call_prom("write", 3, 1, prom.stdout, p, q - p);
341 call_prom("write", 3, 1, prom.stdout,
351 s = va_arg(args, const char *);
356 v = va_arg(args, unsigned long);
361 vs = va_arg(args, int);
372 else if (*q == 'x') {
374 v = va_arg(args, unsigned long);
376 } else if (*q == 'u') { /* '%lu' */
378 v = va_arg(args, unsigned long);
380 } else if (*q == 'd') { /* %ld */
382 vs = va_arg(args, long);
395 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
399 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
401 * Old OF requires we claim physical and virtual separately
402 * and then map explicitly (assuming virtual mode)
407 ret = call_prom_ret("call-method", 5, 2, &result,
408 ADDR("claim"), prom.memory,
410 if (ret != 0 || result == -1)
412 ret = call_prom_ret("call-method", 5, 2, &result,
413 ADDR("claim"), prom.mmumap,
416 call_prom("call-method", 4, 1, ADDR("release"),
417 prom.memory, size, virt);
420 /* the 0x12 is M (coherence) + PP == read/write */
421 call_prom("call-method", 6, 1,
422 ADDR("map"), prom.mmumap, 0x12, size, virt, virt);
425 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
429 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
432 /* Do not call exit because it clears the screen on pmac
433 * it also causes some sort of double-fault on early pmacs */
434 if (of_platform == PLATFORM_POWERMAC)
437 /* ToDo: should put up an SRC here on pSeries */
438 call_prom("exit", 0, 0);
440 for (;;) /* should never get here */
445 static int __init prom_next_node(phandle *nodep)
449 if ((node = *nodep) != 0
450 && (*nodep = call_prom("child", 1, 1, node)) != 0)
452 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
455 if ((node = call_prom("parent", 1, 1, node)) == 0)
457 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
462 static int inline prom_getprop(phandle node, const char *pname,
463 void *value, size_t valuelen)
465 return call_prom("getprop", 4, 1, node, ADDR(pname),
466 (u32)(unsigned long) value, (u32) valuelen);
469 static int inline prom_getproplen(phandle node, const char *pname)
471 return call_prom("getproplen", 2, 1, node, ADDR(pname));
474 static void add_string(char **str, const char *q)
484 static char *tohex(unsigned int x)
486 static char digits[] = "0123456789abcdef";
487 static char result[9];
494 result[i] = digits[x & 0xf];
496 } while (x != 0 && i > 0);
500 static int __init prom_setprop(phandle node, const char *nodename,
501 const char *pname, void *value, size_t valuelen)
505 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
506 return call_prom("setprop", 4, 1, node, ADDR(pname),
507 (u32)(unsigned long) value, (u32) valuelen);
509 /* gah... setprop doesn't work on longtrail, have to use interpret */
511 add_string(&p, "dev");
512 add_string(&p, nodename);
513 add_string(&p, tohex((u32)(unsigned long) value));
514 add_string(&p, tohex(valuelen));
515 add_string(&p, tohex(ADDR(pname)));
516 add_string(&p, tohex(strlen(pname)));
517 add_string(&p, "property");
519 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
522 /* We can't use the standard versions because of relocation headaches. */
523 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
524 || ('a' <= (c) && (c) <= 'f') \
525 || ('A' <= (c) && (c) <= 'F'))
527 #define isdigit(c) ('0' <= (c) && (c) <= '9')
528 #define islower(c) ('a' <= (c) && (c) <= 'z')
529 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
531 static unsigned long prom_strtoul(const char *cp, const char **endp)
533 unsigned long result = 0, base = 10, value;
538 if (toupper(*cp) == 'X') {
544 while (isxdigit(*cp) &&
545 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
546 result = result * base + value;
556 static unsigned long prom_memparse(const char *ptr, const char **retptr)
558 unsigned long ret = prom_strtoul(ptr, retptr);
562 * We can't use a switch here because GCC *may* generate a
563 * jump table which won't work, because we're not running at
564 * the address we're linked at.
566 if ('G' == **retptr || 'g' == **retptr)
569 if ('M' == **retptr || 'm' == **retptr)
572 if ('K' == **retptr || 'k' == **retptr)
584 * Early parsing of the command line passed to the kernel, used for
585 * "mem=x" and the options that affect the iommu
587 static void __init early_cmdline_parse(void)
594 prom_cmd_line[0] = 0;
596 if ((long)prom.chosen > 0)
597 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
598 #ifdef CONFIG_CMDLINE
599 if (l <= 0 || p[0] == '\0') /* dbl check */
600 strlcpy(prom_cmd_line,
601 CONFIG_CMDLINE, sizeof(prom_cmd_line));
602 #endif /* CONFIG_CMDLINE */
603 prom_printf("command line: %s\n", prom_cmd_line);
606 opt = strstr(prom_cmd_line, "iommu=");
608 prom_printf("iommu opt is: %s\n", opt);
610 while (*opt && *opt == ' ')
612 if (!strncmp(opt, "off", 3))
614 else if (!strncmp(opt, "force", 5))
615 prom_iommu_force_on = 1;
618 opt = strstr(prom_cmd_line, "mem=");
621 prom_memory_limit = prom_memparse(opt, (const char **)&opt);
623 /* Align to 16 MB == size of ppc64 large page */
624 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000);
629 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
631 * The architecture vector has an array of PVR mask/value pairs,
632 * followed by # option vectors - 1, followed by the option vectors.
634 * See prom.h for the definition of the bits specified in the
635 * architecture vector.
637 * Because the description vector contains a mix of byte and word
638 * values, we declare it as an unsigned char array, and use this
639 * macro to put word values in.
641 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
642 ((x) >> 8) & 0xff, (x) & 0xff
644 unsigned char ibm_architecture_vec[] = {
645 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
646 W(0xffff0000), W(0x003e0000), /* POWER6 */
647 W(0xffff0000), W(0x003f0000), /* POWER7 */
648 W(0xffff0000), W(0x004b0000), /* POWER8E */
649 W(0xffff0000), W(0x004d0000), /* POWER8 */
650 W(0xffffffff), W(0x0f000004), /* all 2.07-compliant */
651 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
652 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
653 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
654 6 - 1, /* 6 option vectors */
656 /* option vector 1: processor architectures supported */
658 0, /* don't ignore, don't halt */
659 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
660 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
662 /* option vector 2: Open Firmware options supported */
666 W(0xffffffff), /* real_base */
667 W(0xffffffff), /* real_size */
668 W(0xffffffff), /* virt_base */
669 W(0xffffffff), /* virt_size */
670 W(0xffffffff), /* load_base */
671 W(256), /* 256MB min RMA */
672 W(0xffffffff), /* full client load */
673 0, /* min RMA percentage of total RAM */
674 48, /* max log_2(hash table size) */
676 /* option vector 3: processor options supported */
678 0, /* don't ignore, don't halt */
679 OV3_FP | OV3_VMX | OV3_DFP,
681 /* option vector 4: IBM PAPR implementation */
684 OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
686 /* option vector 5: PAPR/OF options */
688 0, /* don't ignore, don't halt */
689 OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
690 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
691 #ifdef CONFIG_PCI_MSI
692 /* PCIe/MSI support. Without MSI full PCIe is not supported */
698 #ifdef CONFIG_PPC_SMLPAR
699 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
703 OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
707 /* WARNING: The offset of the "number of cores" field below
708 * must match by the macro below. Update the definition if
709 * the structure layout changes.
711 #define IBM_ARCH_VEC_NRCORES_OFFSET 125
712 W(NR_CPUS), /* number of cores supported */
717 OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) |
718 OV5_FEAT(OV5_PFO_HW_842),
719 OV5_FEAT(OV5_SUB_PROCESSORS),
720 /* option vector 6: IBM PAPR hints */
728 /* Old method - ELF header with PT_NOTE sections only works on BE */
729 #ifdef __BIG_ENDIAN__
730 static struct fake_elf {
737 char name[8]; /* "PowerPC" */
751 char name[24]; /* "IBM,RPA-Client-Config" */
765 .e_ident = { 0x7f, 'E', 'L', 'F',
766 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
767 .e_type = ET_EXEC, /* yeah right */
769 .e_version = EV_CURRENT,
770 .e_phoff = offsetof(struct fake_elf, phdr),
771 .e_phentsize = sizeof(Elf32_Phdr),
777 .p_offset = offsetof(struct fake_elf, chrpnote),
778 .p_filesz = sizeof(struct chrpnote)
781 .p_offset = offsetof(struct fake_elf, rpanote),
782 .p_filesz = sizeof(struct rpanote)
786 .namesz = sizeof("PowerPC"),
787 .descsz = sizeof(struct chrpdesc),
791 .real_mode = ~0U, /* ~0 means "don't care" */
800 .namesz = sizeof("IBM,RPA-Client-Config"),
801 .descsz = sizeof(struct rpadesc),
803 .name = "IBM,RPA-Client-Config",
806 .min_rmo_size = 64, /* in megabytes */
807 .min_rmo_percent = 0,
808 .max_pft_size = 48, /* 2^48 bytes max PFT size */
815 #endif /* __BIG_ENDIAN__ */
817 static int __init prom_count_smt_threads(void)
823 /* Pick up th first CPU node we can find */
824 for (node = 0; prom_next_node(&node); ) {
826 prom_getprop(node, "device_type", type, sizeof(type));
828 if (strcmp(type, "cpu"))
831 * There is an entry for each smt thread, each entry being
832 * 4 bytes long. All cpus should have the same number of
833 * smt threads, so return after finding the first.
835 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
836 if (plen == PROM_ERROR)
839 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
842 if (plen < 1 || plen > 64) {
843 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
844 (unsigned long)plen);
849 prom_debug("No threads found, assuming 1 per core\n");
856 static void __init prom_send_capabilities(void)
861 unsigned char *ptcores;
863 root = call_prom("open", 1, 1, ADDR("/"));
865 /* We need to tell the FW about the number of cores we support.
867 * To do that, we count the number of threads on the first core
868 * (we assume this is the same for all cores) and use it to
872 /* The core value may start at an odd address. If such a word
873 * access is made at a cache line boundary, this leads to an
874 * exception which may not be handled at this time.
875 * Forcing a per byte access to avoid exception.
877 ptcores = &ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
879 cores |= ptcores[0] << 24;
880 cores |= ptcores[1] << 16;
881 cores |= ptcores[2] << 8;
883 if (cores != NR_CPUS) {
884 prom_printf("WARNING ! "
885 "ibm_architecture_vec structure inconsistent: %lu!\n",
888 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
889 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
891 ptcores[0] = (cores >> 24) & 0xff;
892 ptcores[1] = (cores >> 16) & 0xff;
893 ptcores[2] = (cores >> 8) & 0xff;
894 ptcores[3] = cores & 0xff;
897 /* try calling the ibm,client-architecture-support method */
898 prom_printf("Calling ibm,client-architecture-support...");
899 if (call_prom_ret("call-method", 3, 2, &ret,
900 ADDR("ibm,client-architecture-support"),
902 ADDR(ibm_architecture_vec)) == 0) {
903 /* the call exists... */
905 prom_printf("\nWARNING: ibm,client-architecture"
906 "-support call FAILED!\n");
907 call_prom("close", 1, 0, root);
908 prom_printf(" done\n");
911 call_prom("close", 1, 0, root);
912 prom_printf(" not implemented\n");
915 #ifdef __BIG_ENDIAN__
919 /* no ibm,client-architecture-support call, try the old way */
920 elfloader = call_prom("open", 1, 1,
921 ADDR("/packages/elf-loader"));
922 if (elfloader == 0) {
923 prom_printf("couldn't open /packages/elf-loader\n");
926 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
927 elfloader, ADDR(&fake_elf));
928 call_prom("close", 1, 0, elfloader);
930 #endif /* __BIG_ENDIAN__ */
932 #endif /* #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
935 * Memory allocation strategy... our layout is normally:
937 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
938 * rare cases, initrd might end up being before the kernel though.
939 * We assume this won't override the final kernel at 0, we have no
940 * provision to handle that in this version, but it should hopefully
943 * alloc_top is set to the top of RMO, eventually shrink down if the
946 * alloc_bottom is set to the top of kernel/initrd
948 * from there, allocations are done this way : rtas is allocated
949 * topmost, and the device-tree is allocated from the bottom. We try
950 * to grow the device-tree allocation as we progress. If we can't,
951 * then we fail, we don't currently have a facility to restart
952 * elsewhere, but that shouldn't be necessary.
954 * Note that calls to reserve_mem have to be done explicitly, memory
955 * allocated with either alloc_up or alloc_down isn't automatically
961 * Allocates memory in the RMO upward from the kernel/initrd
963 * When align is 0, this is a special case, it means to allocate in place
964 * at the current location of alloc_bottom or fail (that is basically
965 * extending the previous allocation). Used for the device-tree flattening
967 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
969 unsigned long base = alloc_bottom;
970 unsigned long addr = 0;
973 base = _ALIGN_UP(base, align);
974 prom_debug("alloc_up(%x, %x)\n", size, align);
976 prom_panic("alloc_up() called with mem not initialized\n");
979 base = _ALIGN_UP(alloc_bottom, align);
983 for(; (base + size) <= alloc_top;
984 base = _ALIGN_UP(base + 0x100000, align)) {
985 prom_debug(" trying: 0x%x\n\r", base);
986 addr = (unsigned long)prom_claim(base, size, 0);
987 if (addr != PROM_ERROR && addr != 0)
995 alloc_bottom = addr + size;
997 prom_debug(" -> %x\n", addr);
998 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
999 prom_debug(" alloc_top : %x\n", alloc_top);
1000 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1001 prom_debug(" rmo_top : %x\n", rmo_top);
1002 prom_debug(" ram_top : %x\n", ram_top);
1008 * Allocates memory downward, either from top of RMO, or if highmem
1009 * is set, from the top of RAM. Note that this one doesn't handle
1010 * failures. It does claim memory if highmem is not set.
1012 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1015 unsigned long base, addr = 0;
1017 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1018 highmem ? "(high)" : "(low)");
1020 prom_panic("alloc_down() called with mem not initialized\n");
1023 /* Carve out storage for the TCE table. */
1024 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1025 if (addr <= alloc_bottom)
1027 /* Will we bump into the RMO ? If yes, check out that we
1028 * didn't overlap existing allocations there, if we did,
1029 * we are dead, we must be the first in town !
1031 if (addr < rmo_top) {
1032 /* Good, we are first */
1033 if (alloc_top == rmo_top)
1034 alloc_top = rmo_top = addr;
1038 alloc_top_high = addr;
1042 base = _ALIGN_DOWN(alloc_top - size, align);
1043 for (; base > alloc_bottom;
1044 base = _ALIGN_DOWN(base - 0x100000, align)) {
1045 prom_debug(" trying: 0x%x\n\r", base);
1046 addr = (unsigned long)prom_claim(base, size, 0);
1047 if (addr != PROM_ERROR && addr != 0)
1056 prom_debug(" -> %x\n", addr);
1057 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1058 prom_debug(" alloc_top : %x\n", alloc_top);
1059 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1060 prom_debug(" rmo_top : %x\n", rmo_top);
1061 prom_debug(" ram_top : %x\n", ram_top);
1067 * Parse a "reg" cell
1069 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1072 unsigned long r = 0;
1074 /* Ignore more than 2 cells */
1075 while (s > sizeof(unsigned long) / 4) {
1079 r = be32_to_cpu(*p++);
1083 r |= be32_to_cpu(*(p++));
1091 * Very dumb function for adding to the memory reserve list, but
1092 * we don't need anything smarter at this point
1094 * XXX Eventually check for collisions. They should NEVER happen.
1095 * If problems seem to show up, it would be a good start to track
1098 static void __init reserve_mem(u64 base, u64 size)
1100 u64 top = base + size;
1101 unsigned long cnt = mem_reserve_cnt;
1106 /* We need to always keep one empty entry so that we
1107 * have our terminator with "size" set to 0 since we are
1108 * dumb and just copy this entire array to the boot params
1110 base = _ALIGN_DOWN(base, PAGE_SIZE);
1111 top = _ALIGN_UP(top, PAGE_SIZE);
1114 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1115 prom_panic("Memory reserve map exhausted !\n");
1116 mem_reserve_map[cnt].base = cpu_to_be64(base);
1117 mem_reserve_map[cnt].size = cpu_to_be64(size);
1118 mem_reserve_cnt = cnt + 1;
1122 * Initialize memory allocation mechanism, parse "memory" nodes and
1123 * obtain that way the top of memory and RMO to setup out local allocator
1125 static void __init prom_init_mem(void)
1128 char *path, type[64];
1135 * We iterate the memory nodes to find
1136 * 1) top of RMO (first node)
1139 val = cpu_to_be32(2);
1140 prom_getprop(prom.root, "#address-cells", &val, sizeof(val));
1141 rac = be32_to_cpu(val);
1142 val = cpu_to_be32(1);
1143 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));
1144 rsc = be32_to_cpu(val);
1145 prom_debug("root_addr_cells: %x\n", rac);
1146 prom_debug("root_size_cells: %x\n", rsc);
1148 prom_debug("scanning memory:\n");
1149 path = prom_scratch;
1151 for (node = 0; prom_next_node(&node); ) {
1153 prom_getprop(node, "device_type", type, sizeof(type));
1157 * CHRP Longtrail machines have no device_type
1158 * on the memory node, so check the name instead...
1160 prom_getprop(node, "name", type, sizeof(type));
1162 if (strcmp(type, "memory"))
1165 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1166 if (plen > sizeof(regbuf)) {
1167 prom_printf("memory node too large for buffer !\n");
1168 plen = sizeof(regbuf);
1171 endp = p + (plen / sizeof(cell_t));
1174 memset(path, 0, PROM_SCRATCH_SIZE);
1175 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1176 prom_debug(" node %s :\n", path);
1177 #endif /* DEBUG_PROM */
1179 while ((endp - p) >= (rac + rsc)) {
1180 unsigned long base, size;
1182 base = prom_next_cell(rac, &p);
1183 size = prom_next_cell(rsc, &p);
1187 prom_debug(" %x %x\n", base, size);
1188 if (base == 0 && (of_platform & PLATFORM_LPAR))
1190 if ((base + size) > ram_top)
1191 ram_top = base + size;
1195 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1198 * If prom_memory_limit is set we reduce the upper limits *except* for
1199 * alloc_top_high. This must be the real top of RAM so we can put
1203 alloc_top_high = ram_top;
1205 if (prom_memory_limit) {
1206 if (prom_memory_limit <= alloc_bottom) {
1207 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1209 prom_memory_limit = 0;
1210 } else if (prom_memory_limit >= ram_top) {
1211 prom_printf("Ignoring mem=%x >= ram_top.\n",
1213 prom_memory_limit = 0;
1215 ram_top = prom_memory_limit;
1216 rmo_top = min(rmo_top, prom_memory_limit);
1221 * Setup our top alloc point, that is top of RMO or top of
1222 * segment 0 when running non-LPAR.
1223 * Some RS64 machines have buggy firmware where claims up at
1224 * 1GB fail. Cap at 768MB as a workaround.
1225 * Since 768MB is plenty of room, and we need to cap to something
1226 * reasonable on 32-bit, cap at 768MB on all machines.
1230 rmo_top = min(0x30000000ul, rmo_top);
1231 alloc_top = rmo_top;
1232 alloc_top_high = ram_top;
1235 * Check if we have an initrd after the kernel but still inside
1236 * the RMO. If we do move our bottom point to after it.
1238 if (prom_initrd_start &&
1239 prom_initrd_start < rmo_top &&
1240 prom_initrd_end > alloc_bottom)
1241 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1243 prom_printf("memory layout at init:\n");
1244 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1245 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1246 prom_printf(" alloc_top : %x\n", alloc_top);
1247 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1248 prom_printf(" rmo_top : %x\n", rmo_top);
1249 prom_printf(" ram_top : %x\n", ram_top);
1252 static void __init prom_close_stdin(void)
1257 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) {
1258 stdin = be32_to_cpu(val);
1259 call_prom("close", 1, 0, stdin);
1263 #ifdef CONFIG_PPC_POWERNV
1265 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1266 static u64 __initdata prom_opal_base;
1267 static u64 __initdata prom_opal_entry;
1271 * Allocate room for and instantiate OPAL
1273 static void __init prom_instantiate_opal(void)
1278 u64 size = 0, align = 0x10000;
1282 prom_debug("prom_instantiate_opal: start...\n");
1284 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1285 prom_debug("opal_node: %x\n", opal_node);
1286 if (!PHANDLE_VALID(opal_node))
1290 prom_getprop(opal_node, "opal-runtime-size", &val64, sizeof(val64));
1291 size = be64_to_cpu(val64);
1295 prom_getprop(opal_node, "opal-runtime-alignment", &val64,sizeof(val64));
1296 align = be64_to_cpu(val64);
1298 base = alloc_down(size, align, 0);
1300 prom_printf("OPAL allocation failed !\n");
1304 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1305 if (!IHANDLE_VALID(opal_inst)) {
1306 prom_printf("opening opal package failed (%x)\n", opal_inst);
1310 prom_printf("instantiating opal at 0x%x...", base);
1312 if (call_prom_ret("call-method", 4, 3, rets,
1313 ADDR("load-opal-runtime"),
1315 base >> 32, base & 0xffffffff) != 0
1316 || (rets[0] == 0 && rets[1] == 0)) {
1317 prom_printf(" failed\n");
1320 entry = (((u64)rets[0]) << 32) | rets[1];
1322 prom_printf(" done\n");
1324 reserve_mem(base, size);
1326 prom_debug("opal base = 0x%x\n", base);
1327 prom_debug("opal align = 0x%x\n", align);
1328 prom_debug("opal entry = 0x%x\n", entry);
1329 prom_debug("opal size = 0x%x\n", (long)size);
1331 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1332 &base, sizeof(base));
1333 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1334 &entry, sizeof(entry));
1336 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1337 prom_opal_base = base;
1338 prom_opal_entry = entry;
1340 prom_debug("prom_instantiate_opal: end...\n");
1343 #endif /* CONFIG_PPC_POWERNV */
1346 * Allocate room for and instantiate RTAS
1348 static void __init prom_instantiate_rtas(void)
1352 u32 base, entry = 0;
1356 prom_debug("prom_instantiate_rtas: start...\n");
1358 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1359 prom_debug("rtas_node: %x\n", rtas_node);
1360 if (!PHANDLE_VALID(rtas_node))
1364 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));
1365 size = be32_to_cpu(val);
1369 base = alloc_down(size, PAGE_SIZE, 0);
1371 prom_panic("Could not allocate memory for RTAS\n");
1373 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1374 if (!IHANDLE_VALID(rtas_inst)) {
1375 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1379 prom_printf("instantiating rtas at 0x%x...", base);
1381 if (call_prom_ret("call-method", 3, 2, &entry,
1382 ADDR("instantiate-rtas"),
1383 rtas_inst, base) != 0
1385 prom_printf(" failed\n");
1388 prom_printf(" done\n");
1390 reserve_mem(base, size);
1392 val = cpu_to_be32(base);
1393 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1395 val = cpu_to_be32(entry);
1396 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1399 /* Check if it supports "query-cpu-stopped-state" */
1400 if (prom_getprop(rtas_node, "query-cpu-stopped-state",
1401 &val, sizeof(val)) != PROM_ERROR)
1402 rtas_has_query_cpu_stopped = true;
1404 prom_debug("rtas base = 0x%x\n", base);
1405 prom_debug("rtas entry = 0x%x\n", entry);
1406 prom_debug("rtas size = 0x%x\n", (long)size);
1408 prom_debug("prom_instantiate_rtas: end...\n");
1413 * Allocate room for and instantiate Stored Measurement Log (SML)
1415 static void __init prom_instantiate_sml(void)
1417 phandle ibmvtpm_node;
1418 ihandle ibmvtpm_inst;
1419 u32 entry = 0, size = 0;
1422 prom_debug("prom_instantiate_sml: start...\n");
1424 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/ibm,vtpm"));
1425 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1426 if (!PHANDLE_VALID(ibmvtpm_node))
1429 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/ibm,vtpm"));
1430 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1431 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1435 if (call_prom_ret("call-method", 2, 2, &size,
1436 ADDR("sml-get-handover-size"),
1437 ibmvtpm_inst) != 0 || size == 0) {
1438 prom_printf("SML get handover size failed\n");
1442 base = alloc_down(size, PAGE_SIZE, 0);
1444 prom_panic("Could not allocate memory for sml\n");
1446 prom_printf("instantiating sml at 0x%x...", base);
1448 if (call_prom_ret("call-method", 4, 2, &entry,
1449 ADDR("sml-handover"),
1450 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1451 prom_printf("SML handover failed\n");
1454 prom_printf(" done\n");
1456 reserve_mem(base, size);
1458 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-base",
1459 &base, sizeof(base));
1460 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-size",
1461 &size, sizeof(size));
1463 prom_debug("sml base = 0x%x\n", base);
1464 prom_debug("sml size = 0x%x\n", (long)size);
1466 prom_debug("prom_instantiate_sml: end...\n");
1470 * Allocate room for and initialize TCE tables
1472 #ifdef __BIG_ENDIAN__
1473 static void __init prom_initialize_tce_table(void)
1477 char compatible[64], type[64], model[64];
1478 char *path = prom_scratch;
1480 u32 minalign, minsize;
1481 u64 tce_entry, *tce_entryp;
1482 u64 local_alloc_top, local_alloc_bottom;
1488 prom_debug("starting prom_initialize_tce_table\n");
1490 /* Cache current top of allocs so we reserve a single block */
1491 local_alloc_top = alloc_top_high;
1492 local_alloc_bottom = local_alloc_top;
1494 /* Search all nodes looking for PHBs. */
1495 for (node = 0; prom_next_node(&node); ) {
1499 prom_getprop(node, "compatible",
1500 compatible, sizeof(compatible));
1501 prom_getprop(node, "device_type", type, sizeof(type));
1502 prom_getprop(node, "model", model, sizeof(model));
1504 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1507 /* Keep the old logic intact to avoid regression. */
1508 if (compatible[0] != 0) {
1509 if ((strstr(compatible, "python") == NULL) &&
1510 (strstr(compatible, "Speedwagon") == NULL) &&
1511 (strstr(compatible, "Winnipeg") == NULL))
1513 } else if (model[0] != 0) {
1514 if ((strstr(model, "ython") == NULL) &&
1515 (strstr(model, "peedwagon") == NULL) &&
1516 (strstr(model, "innipeg") == NULL))
1520 if (prom_getprop(node, "tce-table-minalign", &minalign,
1521 sizeof(minalign)) == PROM_ERROR)
1523 if (prom_getprop(node, "tce-table-minsize", &minsize,
1524 sizeof(minsize)) == PROM_ERROR)
1525 minsize = 4UL << 20;
1528 * Even though we read what OF wants, we just set the table
1529 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1530 * By doing this, we avoid the pitfalls of trying to DMA to
1531 * MMIO space and the DMA alias hole.
1533 * On POWER4, firmware sets the TCE region by assuming
1534 * each TCE table is 8MB. Using this memory for anything
1535 * else will impact performance, so we always allocate 8MB.
1538 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1539 minsize = 8UL << 20;
1541 minsize = 4UL << 20;
1543 /* Align to the greater of the align or size */
1544 align = max(minalign, minsize);
1545 base = alloc_down(minsize, align, 1);
1547 prom_panic("ERROR, cannot find space for TCE table.\n");
1548 if (base < local_alloc_bottom)
1549 local_alloc_bottom = base;
1551 /* It seems OF doesn't null-terminate the path :-( */
1552 memset(path, 0, PROM_SCRATCH_SIZE);
1553 /* Call OF to setup the TCE hardware */
1554 if (call_prom("package-to-path", 3, 1, node,
1555 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1556 prom_printf("package-to-path failed\n");
1559 /* Save away the TCE table attributes for later use. */
1560 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1561 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1563 prom_debug("TCE table: %s\n", path);
1564 prom_debug("\tnode = 0x%x\n", node);
1565 prom_debug("\tbase = 0x%x\n", base);
1566 prom_debug("\tsize = 0x%x\n", minsize);
1568 /* Initialize the table to have a one-to-one mapping
1569 * over the allocated size.
1571 tce_entryp = (u64 *)base;
1572 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1573 tce_entry = (i << PAGE_SHIFT);
1575 *tce_entryp = tce_entry;
1578 prom_printf("opening PHB %s", path);
1579 phb_node = call_prom("open", 1, 1, path);
1581 prom_printf("... failed\n");
1583 prom_printf("... done\n");
1585 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1586 phb_node, -1, minsize,
1587 (u32) base, (u32) (base >> 32));
1588 call_prom("close", 1, 0, phb_node);
1591 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1593 /* These are only really needed if there is a memory limit in
1594 * effect, but we don't know so export them always. */
1595 prom_tce_alloc_start = local_alloc_bottom;
1596 prom_tce_alloc_end = local_alloc_top;
1598 /* Flag the first invalid entry */
1599 prom_debug("ending prom_initialize_tce_table\n");
1601 #endif /* __BIG_ENDIAN__ */
1602 #endif /* CONFIG_PPC64 */
1605 * With CHRP SMP we need to use the OF to start the other processors.
1606 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1607 * so we have to put the processors into a holding pattern controlled
1608 * by the kernel (not OF) before we destroy the OF.
1610 * This uses a chunk of low memory, puts some holding pattern
1611 * code there and sends the other processors off to there until
1612 * smp_boot_cpus tells them to do something. The holding pattern
1613 * checks that address until its cpu # is there, when it is that
1614 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1615 * of setting those values.
1617 * We also use physical address 0x4 here to tell when a cpu
1618 * is in its holding pattern code.
1623 * We want to reference the copy of __secondary_hold_* in the
1624 * 0 - 0x100 address range
1626 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1628 static void __init prom_hold_cpus(void)
1633 unsigned long *spinloop
1634 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1635 unsigned long *acknowledge
1636 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1637 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1640 * On pseries, if RTAS supports "query-cpu-stopped-state",
1641 * we skip this stage, the CPUs will be started by the
1642 * kernel using RTAS.
1644 if ((of_platform == PLATFORM_PSERIES ||
1645 of_platform == PLATFORM_PSERIES_LPAR) &&
1646 rtas_has_query_cpu_stopped) {
1647 prom_printf("prom_hold_cpus: skipped\n");
1651 prom_debug("prom_hold_cpus: start...\n");
1652 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1653 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1654 prom_debug(" 1) acknowledge = 0x%x\n",
1655 (unsigned long)acknowledge);
1656 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1657 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1659 /* Set the common spinloop variable, so all of the secondary cpus
1660 * will block when they are awakened from their OF spinloop.
1661 * This must occur for both SMP and non SMP kernels, since OF will
1662 * be trashed when we move the kernel.
1667 for (node = 0; prom_next_node(&node); ) {
1668 unsigned int cpu_no;
1672 prom_getprop(node, "device_type", type, sizeof(type));
1673 if (strcmp(type, "cpu") != 0)
1676 /* Skip non-configured cpus. */
1677 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1678 if (strcmp(type, "okay") != 0)
1681 reg = cpu_to_be32(-1); /* make sparse happy */
1682 prom_getprop(node, "reg", ®, sizeof(reg));
1683 cpu_no = be32_to_cpu(reg);
1685 prom_debug("cpu hw idx = %lu\n", cpu_no);
1687 /* Init the acknowledge var which will be reset by
1688 * the secondary cpu when it awakens from its OF
1691 *acknowledge = (unsigned long)-1;
1693 if (cpu_no != prom.cpu) {
1694 /* Primary Thread of non-boot cpu or any thread */
1695 prom_printf("starting cpu hw idx %lu... ", cpu_no);
1696 call_prom("start-cpu", 3, 0, node,
1697 secondary_hold, cpu_no);
1699 for (i = 0; (i < 100000000) &&
1700 (*acknowledge == ((unsigned long)-1)); i++ )
1703 if (*acknowledge == cpu_no)
1704 prom_printf("done\n");
1706 prom_printf("failed: %x\n", *acknowledge);
1710 prom_printf("boot cpu hw idx %lu\n", cpu_no);
1711 #endif /* CONFIG_SMP */
1714 prom_debug("prom_hold_cpus: end...\n");
1718 static void __init prom_init_client_services(unsigned long pp)
1720 /* Get a handle to the prom entry point before anything else */
1723 /* get a handle for the stdout device */
1724 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1725 if (!PHANDLE_VALID(prom.chosen))
1726 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1728 /* get device tree root */
1729 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1730 if (!PHANDLE_VALID(prom.root))
1731 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1738 * For really old powermacs, we need to map things we claim.
1739 * For that, we need the ihandle of the mmu.
1740 * Also, on the longtrail, we need to work around other bugs.
1742 static void __init prom_find_mmu(void)
1747 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1748 if (!PHANDLE_VALID(oprom))
1750 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1752 version[sizeof(version) - 1] = 0;
1753 /* XXX might need to add other versions here */
1754 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1755 of_workarounds = OF_WA_CLAIM;
1756 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1757 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1758 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1761 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1762 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1763 sizeof(prom.mmumap));
1764 prom.mmumap = be32_to_cpu(prom.mmumap);
1765 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1766 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1769 #define prom_find_mmu()
1772 static void __init prom_init_stdout(void)
1774 char *path = of_stdout_device;
1776 phandle stdout_node;
1779 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1780 prom_panic("cannot find stdout");
1782 prom.stdout = be32_to_cpu(val);
1784 /* Get the full OF pathname of the stdout device */
1785 memset(path, 0, 256);
1786 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1787 prom_printf("OF stdout device is: %s\n", of_stdout_device);
1788 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1789 path, strlen(path) + 1);
1791 /* instance-to-package fails on PA-Semi */
1792 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);
1793 if (stdout_node != PROM_ERROR) {
1794 val = cpu_to_be32(stdout_node);
1795 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1798 /* If it's a display, note it */
1799 memset(type, 0, sizeof(type));
1800 prom_getprop(stdout_node, "device_type", type, sizeof(type));
1801 if (strcmp(type, "display") == 0)
1802 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);
1806 static int __init prom_find_machine_type(void)
1815 /* Look for a PowerMac or a Cell */
1816 len = prom_getprop(prom.root, "compatible",
1817 compat, sizeof(compat)-1);
1821 char *p = &compat[i];
1825 if (strstr(p, "Power Macintosh") ||
1826 strstr(p, "MacRISC"))
1827 return PLATFORM_POWERMAC;
1829 /* We must make sure we don't detect the IBM Cell
1830 * blades as pSeries due to some firmware issues,
1833 if (strstr(p, "IBM,CBEA") ||
1834 strstr(p, "IBM,CPBW-1.0"))
1835 return PLATFORM_GENERIC;
1836 #endif /* CONFIG_PPC64 */
1841 /* Try to detect OPAL */
1842 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1843 return PLATFORM_OPAL;
1845 /* Try to figure out if it's an IBM pSeries or any other
1846 * PAPR compliant platform. We assume it is if :
1847 * - /device_type is "chrp" (please, do NOT use that for future
1851 len = prom_getprop(prom.root, "device_type",
1852 compat, sizeof(compat)-1);
1854 return PLATFORM_GENERIC;
1855 if (strcmp(compat, "chrp"))
1856 return PLATFORM_GENERIC;
1858 /* Default to pSeries. We need to know if we are running LPAR */
1859 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1860 if (!PHANDLE_VALID(rtas))
1861 return PLATFORM_GENERIC;
1862 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1863 if (x != PROM_ERROR) {
1864 prom_debug("Hypertas detected, assuming LPAR !\n");
1865 return PLATFORM_PSERIES_LPAR;
1867 return PLATFORM_PSERIES;
1869 return PLATFORM_GENERIC;
1873 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
1875 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
1879 * If we have a display that we don't know how to drive,
1880 * we will want to try to execute OF's open method for it
1881 * later. However, OF will probably fall over if we do that
1882 * we've taken over the MMU.
1883 * So we check whether we will need to open the display,
1884 * and if so, open it now.
1886 static void __init prom_check_displays(void)
1888 char type[16], *path;
1893 static unsigned char default_colors[] = {
1911 const unsigned char *clut;
1913 prom_debug("Looking for displays\n");
1914 for (node = 0; prom_next_node(&node); ) {
1915 memset(type, 0, sizeof(type));
1916 prom_getprop(node, "device_type", type, sizeof(type));
1917 if (strcmp(type, "display") != 0)
1920 /* It seems OF doesn't null-terminate the path :-( */
1921 path = prom_scratch;
1922 memset(path, 0, PROM_SCRATCH_SIZE);
1925 * leave some room at the end of the path for appending extra
1928 if (call_prom("package-to-path", 3, 1, node, path,
1929 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
1931 prom_printf("found display : %s, opening... ", path);
1933 ih = call_prom("open", 1, 1, path);
1935 prom_printf("failed\n");
1940 prom_printf("done\n");
1941 prom_setprop(node, path, "linux,opened", NULL, 0);
1943 /* Setup a usable color table when the appropriate
1944 * method is available. Should update this to set-colors */
1945 clut = default_colors;
1946 for (i = 0; i < 16; i++, clut += 3)
1947 if (prom_set_color(ih, i, clut[0], clut[1],
1951 #ifdef CONFIG_LOGO_LINUX_CLUT224
1952 clut = PTRRELOC(logo_linux_clut224.clut);
1953 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
1954 if (prom_set_color(ih, i + 32, clut[0], clut[1],
1957 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1959 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX
1960 if (prom_getprop(node, "linux,boot-display", NULL, 0) !=
1962 u32 width, height, pitch, addr;
1964 prom_printf("Setting btext !\n");
1965 prom_getprop(node, "width", &width, 4);
1966 prom_getprop(node, "height", &height, 4);
1967 prom_getprop(node, "linebytes", &pitch, 4);
1968 prom_getprop(node, "address", &addr, 4);
1969 prom_printf("W=%d H=%d LB=%d addr=0x%x\n",
1970 width, height, pitch, addr);
1971 btext_setup_display(width, height, 8, pitch, addr);
1973 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */
1978 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1979 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
1980 unsigned long needed, unsigned long align)
1984 *mem_start = _ALIGN(*mem_start, align);
1985 while ((*mem_start + needed) > *mem_end) {
1986 unsigned long room, chunk;
1988 prom_debug("Chunk exhausted, claiming more at %x...\n",
1990 room = alloc_top - alloc_bottom;
1991 if (room > DEVTREE_CHUNK_SIZE)
1992 room = DEVTREE_CHUNK_SIZE;
1993 if (room < PAGE_SIZE)
1994 prom_panic("No memory for flatten_device_tree "
1996 chunk = alloc_up(room, 0);
1998 prom_panic("No memory for flatten_device_tree "
1999 "(claim failed)\n");
2000 *mem_end = chunk + room;
2003 ret = (void *)*mem_start;
2004 *mem_start += needed;
2009 #define dt_push_token(token, mem_start, mem_end) do { \
2010 void *room = make_room(mem_start, mem_end, 4, 4); \
2011 *(__be32 *)room = cpu_to_be32(token); \
2014 static unsigned long __init dt_find_string(char *str)
2018 s = os = (char *)dt_string_start;
2020 while (s < (char *)dt_string_end) {
2021 if (strcmp(s, str) == 0)
2029 * The Open Firmware 1275 specification states properties must be 31 bytes or
2030 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2032 #define MAX_PROPERTY_NAME 64
2034 static void __init scan_dt_build_strings(phandle node,
2035 unsigned long *mem_start,
2036 unsigned long *mem_end)
2038 char *prev_name, *namep, *sstart;
2042 sstart = (char *)dt_string_start;
2044 /* get and store all property names */
2047 /* 64 is max len of name including nul. */
2048 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2049 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2050 /* No more nodes: unwind alloc */
2051 *mem_start = (unsigned long)namep;
2056 if (strcmp(namep, "name") == 0) {
2057 *mem_start = (unsigned long)namep;
2061 /* get/create string entry */
2062 soff = dt_find_string(namep);
2064 *mem_start = (unsigned long)namep;
2065 namep = sstart + soff;
2067 /* Trim off some if we can */
2068 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2069 dt_string_end = *mem_start;
2074 /* do all our children */
2075 child = call_prom("child", 1, 1, node);
2076 while (child != 0) {
2077 scan_dt_build_strings(child, mem_start, mem_end);
2078 child = call_prom("peer", 1, 1, child);
2082 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2083 unsigned long *mem_end)
2086 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2088 unsigned char *valp;
2089 static char pname[MAX_PROPERTY_NAME];
2090 int l, room, has_phandle = 0;
2092 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2094 /* get the node's full name */
2095 namep = (char *)*mem_start;
2096 room = *mem_end - *mem_start;
2099 l = call_prom("package-to-path", 3, 1, node, namep, room);
2101 /* Didn't fit? Get more room. */
2103 if (l >= *mem_end - *mem_start)
2104 namep = make_room(mem_start, mem_end, l+1, 1);
2105 call_prom("package-to-path", 3, 1, node, namep, l);
2109 /* Fixup an Apple bug where they have bogus \0 chars in the
2110 * middle of the path in some properties, and extract
2111 * the unit name (everything after the last '/').
2113 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2120 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2123 /* get it again for debugging */
2124 path = prom_scratch;
2125 memset(path, 0, PROM_SCRATCH_SIZE);
2126 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2128 /* get and store all properties */
2130 sstart = (char *)dt_string_start;
2132 if (call_prom("nextprop", 3, 1, node, prev_name,
2137 if (strcmp(pname, "name") == 0) {
2142 /* find string offset */
2143 soff = dt_find_string(pname);
2145 prom_printf("WARNING: Can't find string index for"
2146 " <%s>, node %s\n", pname, path);
2149 prev_name = sstart + soff;
2152 l = call_prom("getproplen", 2, 1, node, pname);
2155 if (l == PROM_ERROR)
2158 /* push property head */
2159 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2160 dt_push_token(l, mem_start, mem_end);
2161 dt_push_token(soff, mem_start, mem_end);
2163 /* push property content */
2164 valp = make_room(mem_start, mem_end, l, 4);
2165 call_prom("getprop", 4, 1, node, pname, valp, l);
2166 *mem_start = _ALIGN(*mem_start, 4);
2168 if (!strcmp(pname, "phandle"))
2172 /* Add a "linux,phandle" property if no "phandle" property already
2173 * existed (can happen with OPAL)
2176 soff = dt_find_string("linux,phandle");
2178 prom_printf("WARNING: Can't find string index for"
2179 " <linux-phandle> node %s\n", path);
2181 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2182 dt_push_token(4, mem_start, mem_end);
2183 dt_push_token(soff, mem_start, mem_end);
2184 valp = make_room(mem_start, mem_end, 4, 4);
2185 *(__be32 *)valp = cpu_to_be32(node);
2189 /* do all our children */
2190 child = call_prom("child", 1, 1, node);
2191 while (child != 0) {
2192 scan_dt_build_struct(child, mem_start, mem_end);
2193 child = call_prom("peer", 1, 1, child);
2196 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2199 static void __init flatten_device_tree(void)
2202 unsigned long mem_start, mem_end, room;
2203 struct boot_param_header *hdr;
2208 * Check how much room we have between alloc top & bottom (+/- a
2209 * few pages), crop to 1MB, as this is our "chunk" size
2211 room = alloc_top - alloc_bottom - 0x4000;
2212 if (room > DEVTREE_CHUNK_SIZE)
2213 room = DEVTREE_CHUNK_SIZE;
2214 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2216 /* Now try to claim that */
2217 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2219 prom_panic("Can't allocate initial device-tree chunk\n");
2220 mem_end = mem_start + room;
2222 /* Get root of tree */
2223 root = call_prom("peer", 1, 1, (phandle)0);
2224 if (root == (phandle)0)
2225 prom_panic ("couldn't get device tree root\n");
2227 /* Build header and make room for mem rsv map */
2228 mem_start = _ALIGN(mem_start, 4);
2229 hdr = make_room(&mem_start, &mem_end,
2230 sizeof(struct boot_param_header), 4);
2231 dt_header_start = (unsigned long)hdr;
2232 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2234 /* Start of strings */
2235 mem_start = PAGE_ALIGN(mem_start);
2236 dt_string_start = mem_start;
2237 mem_start += 4; /* hole */
2239 /* Add "linux,phandle" in there, we'll need it */
2240 namep = make_room(&mem_start, &mem_end, 16, 1);
2241 strcpy(namep, "linux,phandle");
2242 mem_start = (unsigned long)namep + strlen(namep) + 1;
2244 /* Build string array */
2245 prom_printf("Building dt strings...\n");
2246 scan_dt_build_strings(root, &mem_start, &mem_end);
2247 dt_string_end = mem_start;
2249 /* Build structure */
2250 mem_start = PAGE_ALIGN(mem_start);
2251 dt_struct_start = mem_start;
2252 prom_printf("Building dt structure...\n");
2253 scan_dt_build_struct(root, &mem_start, &mem_end);
2254 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2255 dt_struct_end = PAGE_ALIGN(mem_start);
2258 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
2259 hdr->magic = cpu_to_be32(OF_DT_HEADER);
2260 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);
2261 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);
2262 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);
2263 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);
2264 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);
2265 hdr->version = cpu_to_be32(OF_DT_VERSION);
2266 /* Version 16 is not backward compatible */
2267 hdr->last_comp_version = cpu_to_be32(0x10);
2269 /* Copy the reserve map in */
2270 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2275 prom_printf("reserved memory map:\n");
2276 for (i = 0; i < mem_reserve_cnt; i++)
2277 prom_printf(" %x - %x\n",
2278 be64_to_cpu(mem_reserve_map[i].base),
2279 be64_to_cpu(mem_reserve_map[i].size));
2282 /* Bump mem_reserve_cnt to cause further reservations to fail
2283 * since it's too late.
2285 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2287 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2288 dt_string_start, dt_string_end);
2289 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2290 dt_struct_start, dt_struct_end);
2293 #ifdef CONFIG_PPC_MAPLE
2294 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2295 * The values are bad, and it doesn't even have the right number of cells. */
2296 static void __init fixup_device_tree_maple(void)
2299 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2303 name = "/ht@0/isa@4";
2304 isa = call_prom("finddevice", 1, 1, ADDR(name));
2305 if (!PHANDLE_VALID(isa)) {
2306 name = "/ht@0/isa@6";
2307 isa = call_prom("finddevice", 1, 1, ADDR(name));
2308 rloc = 0x01003000; /* IO space; PCI device = 6 */
2310 if (!PHANDLE_VALID(isa))
2313 if (prom_getproplen(isa, "ranges") != 12)
2315 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2319 if (isa_ranges[0] != 0x1 ||
2320 isa_ranges[1] != 0xf4000000 ||
2321 isa_ranges[2] != 0x00010000)
2324 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2326 isa_ranges[0] = 0x1;
2327 isa_ranges[1] = 0x0;
2328 isa_ranges[2] = rloc;
2329 isa_ranges[3] = 0x0;
2330 isa_ranges[4] = 0x0;
2331 isa_ranges[5] = 0x00010000;
2332 prom_setprop(isa, name, "ranges",
2333 isa_ranges, sizeof(isa_ranges));
2336 #define CPC925_MC_START 0xf8000000
2337 #define CPC925_MC_LENGTH 0x1000000
2338 /* The values for memory-controller don't have right number of cells */
2339 static void __init fixup_device_tree_maple_memory_controller(void)
2343 char *name = "/hostbridge@f8000000";
2346 mc = call_prom("finddevice", 1, 1, ADDR(name));
2347 if (!PHANDLE_VALID(mc))
2350 if (prom_getproplen(mc, "reg") != 8)
2353 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2354 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2355 if ((ac != 2) || (sc != 2))
2358 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2361 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2364 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2367 mc_reg[1] = CPC925_MC_START;
2369 mc_reg[3] = CPC925_MC_LENGTH;
2370 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2373 #define fixup_device_tree_maple()
2374 #define fixup_device_tree_maple_memory_controller()
2377 #ifdef CONFIG_PPC_CHRP
2379 * Pegasos and BriQ lacks the "ranges" property in the isa node
2380 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2381 * Pegasos has the IDE configured in legacy mode, but advertised as native
2383 static void __init fixup_device_tree_chrp(void)
2387 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2391 name = "/pci@80000000/isa@c";
2392 ph = call_prom("finddevice", 1, 1, ADDR(name));
2393 if (!PHANDLE_VALID(ph)) {
2394 name = "/pci@ff500000/isa@6";
2395 ph = call_prom("finddevice", 1, 1, ADDR(name));
2396 rloc = 0x01003000; /* IO space; PCI device = 6 */
2398 if (PHANDLE_VALID(ph)) {
2399 rc = prom_getproplen(ph, "ranges");
2400 if (rc == 0 || rc == PROM_ERROR) {
2401 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2408 prop[5] = 0x00010000;
2409 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2413 name = "/pci@80000000/ide@C,1";
2414 ph = call_prom("finddevice", 1, 1, ADDR(name));
2415 if (PHANDLE_VALID(ph)) {
2416 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2419 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2420 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2421 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2422 if (rc == sizeof(u32)) {
2424 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2429 #define fixup_device_tree_chrp()
2432 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2433 static void __init fixup_device_tree_pmac(void)
2435 phandle u3, i2c, mpic;
2440 /* Some G5s have a missing interrupt definition, fix it up here */
2441 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2442 if (!PHANDLE_VALID(u3))
2444 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2445 if (!PHANDLE_VALID(i2c))
2447 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2448 if (!PHANDLE_VALID(mpic))
2451 /* check if proper rev of u3 */
2452 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2455 if (u3_rev < 0x35 || u3_rev > 0x39)
2457 /* does it need fixup ? */
2458 if (prom_getproplen(i2c, "interrupts") > 0)
2461 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2463 /* interrupt on this revision of u3 is number 0 and level */
2466 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2467 &interrupts, sizeof(interrupts));
2469 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2470 &parent, sizeof(parent));
2473 #define fixup_device_tree_pmac()
2476 #ifdef CONFIG_PPC_EFIKA
2478 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2479 * to talk to the phy. If the phy-handle property is missing, then this
2480 * function is called to add the appropriate nodes and link it to the
2483 static void __init fixup_device_tree_efika_add_phy(void)
2489 /* Check if /builtin/ethernet exists - bail if it doesn't */
2490 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2491 if (!PHANDLE_VALID(node))
2494 /* Check if the phy-handle property exists - bail if it does */
2495 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2500 * At this point the ethernet device doesn't have a phy described.
2501 * Now we need to add the missing phy node and linkage
2504 /* Check for an MDIO bus node - if missing then create one */
2505 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2506 if (!PHANDLE_VALID(node)) {
2507 prom_printf("Adding Ethernet MDIO node\n");
2508 call_prom("interpret", 1, 1,
2509 " s\" /builtin\" find-device"
2511 " 1 encode-int s\" #address-cells\" property"
2512 " 0 encode-int s\" #size-cells\" property"
2513 " s\" mdio\" device-name"
2514 " s\" fsl,mpc5200b-mdio\" encode-string"
2515 " s\" compatible\" property"
2516 " 0xf0003000 0x400 reg"
2518 " 0x5 encode-int encode+"
2519 " 0x3 encode-int encode+"
2520 " s\" interrupts\" property"
2524 /* Check for a PHY device node - if missing then create one and
2525 * give it's phandle to the ethernet node */
2526 node = call_prom("finddevice", 1, 1,
2527 ADDR("/builtin/mdio/ethernet-phy"));
2528 if (!PHANDLE_VALID(node)) {
2529 prom_printf("Adding Ethernet PHY node\n");
2530 call_prom("interpret", 1, 1,
2531 " s\" /builtin/mdio\" find-device"
2533 " s\" ethernet-phy\" device-name"
2534 " 0x10 encode-int s\" reg\" property"
2538 " s\" /builtin/ethernet\" find-device"
2540 " s\" phy-handle\" property"
2545 static void __init fixup_device_tree_efika(void)
2547 int sound_irq[3] = { 2, 2, 0 };
2548 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2549 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2550 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2551 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2556 /* Check if we're really running on a EFIKA */
2557 node = call_prom("finddevice", 1, 1, ADDR("/"));
2558 if (!PHANDLE_VALID(node))
2561 rv = prom_getprop(node, "model", prop, sizeof(prop));
2562 if (rv == PROM_ERROR)
2564 if (strcmp(prop, "EFIKA5K2"))
2567 prom_printf("Applying EFIKA device tree fixups\n");
2569 /* Claiming to be 'chrp' is death */
2570 node = call_prom("finddevice", 1, 1, ADDR("/"));
2571 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2572 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2573 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2575 /* CODEGEN,description is exposed in /proc/cpuinfo so
2577 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2578 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2579 prom_setprop(node, "/", "CODEGEN,description",
2580 "Efika 5200B PowerPC System",
2581 sizeof("Efika 5200B PowerPC System"));
2583 /* Fixup bestcomm interrupts property */
2584 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2585 if (PHANDLE_VALID(node)) {
2586 len = prom_getproplen(node, "interrupts");
2588 prom_printf("Fixing bestcomm interrupts property\n");
2589 prom_setprop(node, "/builtin/bestcom", "interrupts",
2590 bcomm_irq, sizeof(bcomm_irq));
2594 /* Fixup sound interrupts property */
2595 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2596 if (PHANDLE_VALID(node)) {
2597 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2598 if (rv == PROM_ERROR) {
2599 prom_printf("Adding sound interrupts property\n");
2600 prom_setprop(node, "/builtin/sound", "interrupts",
2601 sound_irq, sizeof(sound_irq));
2605 /* Make sure ethernet phy-handle property exists */
2606 fixup_device_tree_efika_add_phy();
2609 #define fixup_device_tree_efika()
2612 static void __init fixup_device_tree(void)
2614 fixup_device_tree_maple();
2615 fixup_device_tree_maple_memory_controller();
2616 fixup_device_tree_chrp();
2617 fixup_device_tree_pmac();
2618 fixup_device_tree_efika();
2621 static void __init prom_find_boot_cpu(void)
2628 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0)
2630 prom_cpu = be32_to_cpu(rval);
2632 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2634 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval));
2635 prom.cpu = be32_to_cpu(rval);
2637 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2640 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2642 #ifdef CONFIG_BLK_DEV_INITRD
2643 if (r3 && r4 && r4 != 0xdeadbeef) {
2646 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2647 prom_initrd_end = prom_initrd_start + r4;
2649 val = cpu_to_be64(prom_initrd_start);
2650 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2652 val = cpu_to_be64(prom_initrd_end);
2653 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2656 reserve_mem(prom_initrd_start,
2657 prom_initrd_end - prom_initrd_start);
2659 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2660 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2662 #endif /* CONFIG_BLK_DEV_INITRD */
2666 #ifdef CONFIG_RELOCATABLE
2667 static void reloc_toc(void)
2671 static void unreloc_toc(void)
2675 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
2678 unsigned long *toc_entry;
2680 /* Get the start of the TOC by using r2 directly. */
2681 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
2683 for (i = 0; i < nr_entries; i++) {
2684 *toc_entry = *toc_entry + offset;
2689 static void reloc_toc(void)
2691 unsigned long offset = reloc_offset();
2692 unsigned long nr_entries =
2693 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2695 __reloc_toc(offset, nr_entries);
2700 static void unreloc_toc(void)
2702 unsigned long offset = reloc_offset();
2703 unsigned long nr_entries =
2704 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2708 __reloc_toc(-offset, nr_entries);
2714 * We enter here early on, when the Open Firmware prom is still
2715 * handling exceptions and the MMU hash table for us.
2718 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2720 unsigned long r6, unsigned long r7,
2721 unsigned long kbase)
2726 unsigned long offset = reloc_offset();
2733 * First zero the BSS
2735 memset(&__bss_start, 0, __bss_stop - __bss_start);
2738 * Init interface to Open Firmware, get some node references,
2741 prom_init_client_services(pp);
2744 * See if this OF is old enough that we need to do explicit maps
2745 * and other workarounds
2750 * Init prom stdout device
2754 prom_printf("Preparing to boot %s", linux_banner);
2757 * Get default machine type. At this point, we do not differentiate
2758 * between pSeries SMP and pSeries LPAR
2760 of_platform = prom_find_machine_type();
2761 prom_printf("Detected machine type: %x\n", of_platform);
2763 #ifndef CONFIG_NONSTATIC_KERNEL
2764 /* Bail if this is a kdump kernel. */
2765 if (PHYSICAL_START > 0)
2766 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2770 * Check for an initrd
2772 prom_check_initrd(r3, r4);
2774 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2776 * On pSeries, inform the firmware about our capabilities
2778 if (of_platform == PLATFORM_PSERIES ||
2779 of_platform == PLATFORM_PSERIES_LPAR)
2780 prom_send_capabilities();
2784 * Copy the CPU hold code
2786 if (of_platform != PLATFORM_POWERMAC)
2787 copy_and_flush(0, kbase, 0x100, 0);
2790 * Do early parsing of command line
2792 early_cmdline_parse();
2795 * Initialize memory management within prom_init
2800 * Determine which cpu is actually running right _now_
2802 prom_find_boot_cpu();
2805 * Initialize display devices
2807 prom_check_displays();
2809 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__)
2811 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2812 * that uses the allocator, we need to make sure we get the top of memory
2813 * available for us here...
2815 if (of_platform == PLATFORM_PSERIES)
2816 prom_initialize_tce_table();
2820 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2821 * have a usable RTAS implementation.
2823 if (of_platform != PLATFORM_POWERMAC &&
2824 of_platform != PLATFORM_OPAL)
2825 prom_instantiate_rtas();
2827 #ifdef CONFIG_PPC_POWERNV
2828 if (of_platform == PLATFORM_OPAL)
2829 prom_instantiate_opal();
2830 #endif /* CONFIG_PPC_POWERNV */
2833 /* instantiate sml */
2834 prom_instantiate_sml();
2838 * On non-powermacs, put all CPUs in spin-loops.
2840 * PowerMacs use a different mechanism to spin CPUs
2842 * (This must be done after instanciating RTAS)
2844 if (of_platform != PLATFORM_POWERMAC &&
2845 of_platform != PLATFORM_OPAL)
2849 * Fill in some infos for use by the kernel later on
2851 if (prom_memory_limit) {
2852 __be64 val = cpu_to_be64(prom_memory_limit);
2853 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
2858 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
2861 if (prom_iommu_force_on)
2862 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
2865 if (prom_tce_alloc_start) {
2866 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
2867 &prom_tce_alloc_start,
2868 sizeof(prom_tce_alloc_start));
2869 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
2870 &prom_tce_alloc_end,
2871 sizeof(prom_tce_alloc_end));
2876 * Fixup any known bugs in the device-tree
2878 fixup_device_tree();
2881 * Now finally create the flattened device-tree
2883 prom_printf("copying OF device tree...\n");
2884 flatten_device_tree();
2887 * in case stdin is USB and still active on IBM machines...
2888 * Unfortunately quiesce crashes on some powermacs if we have
2889 * closed stdin already (in particular the powerbook 101). It
2890 * appears that the OPAL version of OFW doesn't like it either.
2892 if (of_platform != PLATFORM_POWERMAC &&
2893 of_platform != PLATFORM_OPAL)
2897 * Call OF "quiesce" method to shut down pending DMA's from
2900 prom_printf("Quiescing Open Firmware ...\n");
2901 call_prom("quiesce", 0, 0);
2904 * And finally, call the kernel passing it the flattened device
2905 * tree and NULL as r5, thus triggering the new entry point which
2906 * is common to us and kexec
2908 hdr = dt_header_start;
2910 /* Don't print anything after quiesce under OPAL, it crashes OFW */
2911 if (of_platform != PLATFORM_OPAL) {
2912 prom_printf("Booting Linux via __start() ...\n");
2913 prom_debug("->dt_header_start=0x%x\n", hdr);
2917 reloc_got2(-offset);
2922 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
2923 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
2924 __start(hdr, kbase, 0, 0, 0,
2925 prom_opal_base, prom_opal_entry);
2927 __start(hdr, kbase, 0, 0, 0, 0, 0);