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), /* POWER8E */
648 W(0xffff0000), W(0x004d0000), /* POWER8 */
649 W(0xffffffff), W(0x0f000004), /* all 2.07-compliant */
650 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
651 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
652 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
653 6 - 1, /* 6 option vectors */
655 /* option vector 1: processor architectures supported */
657 0, /* don't ignore, don't halt */
658 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
659 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
661 /* option vector 2: Open Firmware options supported */
665 W(0xffffffff), /* real_base */
666 W(0xffffffff), /* real_size */
667 W(0xffffffff), /* virt_base */
668 W(0xffffffff), /* virt_size */
669 W(0xffffffff), /* load_base */
670 W(256), /* 256MB min RMA */
671 W(0xffffffff), /* full client load */
672 0, /* min RMA percentage of total RAM */
673 48, /* max log_2(hash table size) */
675 /* option vector 3: processor options supported */
677 0, /* don't ignore, don't halt */
678 OV3_FP | OV3_VMX | OV3_DFP,
680 /* option vector 4: IBM PAPR implementation */
683 OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
685 /* option vector 5: PAPR/OF options */
687 0, /* don't ignore, don't halt */
688 OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) |
689 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) |
690 #ifdef CONFIG_PCI_MSI
691 /* PCIe/MSI support. Without MSI full PCIe is not supported */
697 #ifdef CONFIG_PPC_SMLPAR
698 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO),
702 OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN),
706 /* WARNING: The offset of the "number of cores" field below
707 * must match by the macro below. Update the definition if
708 * the structure layout changes.
710 #define IBM_ARCH_VEC_NRCORES_OFFSET 125
711 W(NR_CPUS), /* number of cores supported */
716 OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) |
717 OV5_FEAT(OV5_PFO_HW_842),
718 OV5_FEAT(OV5_SUB_PROCESSORS),
719 /* option vector 6: IBM PAPR hints */
727 /* Old method - ELF header with PT_NOTE sections */
728 static struct fake_elf {
735 char name[8]; /* "PowerPC" */
749 char name[24]; /* "IBM,RPA-Client-Config" */
763 .e_ident = { 0x7f, 'E', 'L', 'F',
764 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
765 .e_type = ET_EXEC, /* yeah right */
767 .e_version = EV_CURRENT,
768 .e_phoff = offsetof(struct fake_elf, phdr),
769 .e_phentsize = sizeof(Elf32_Phdr),
775 .p_offset = offsetof(struct fake_elf, chrpnote),
776 .p_filesz = sizeof(struct chrpnote)
779 .p_offset = offsetof(struct fake_elf, rpanote),
780 .p_filesz = sizeof(struct rpanote)
784 .namesz = sizeof("PowerPC"),
785 .descsz = sizeof(struct chrpdesc),
789 .real_mode = ~0U, /* ~0 means "don't care" */
798 .namesz = sizeof("IBM,RPA-Client-Config"),
799 .descsz = sizeof(struct rpadesc),
801 .name = "IBM,RPA-Client-Config",
804 .min_rmo_size = 64, /* in megabytes */
805 .min_rmo_percent = 0,
806 .max_pft_size = 48, /* 2^48 bytes max PFT size */
814 static int __init prom_count_smt_threads(void)
820 /* Pick up th first CPU node we can find */
821 for (node = 0; prom_next_node(&node); ) {
823 prom_getprop(node, "device_type", type, sizeof(type));
825 if (strcmp(type, "cpu"))
828 * There is an entry for each smt thread, each entry being
829 * 4 bytes long. All cpus should have the same number of
830 * smt threads, so return after finding the first.
832 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
833 if (plen == PROM_ERROR)
836 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
839 if (plen < 1 || plen > 64) {
840 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
841 (unsigned long)plen);
846 prom_debug("No threads found, assuming 1 per core\n");
853 static void __init prom_send_capabilities(void)
855 ihandle elfloader, root;
859 root = call_prom("open", 1, 1, ADDR("/"));
861 /* We need to tell the FW about the number of cores we support.
863 * To do that, we count the number of threads on the first core
864 * (we assume this is the same for all cores) and use it to
867 cores = (u32 *)&ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
868 if (*cores != NR_CPUS) {
869 prom_printf("WARNING ! "
870 "ibm_architecture_vec structure inconsistent: %lu!\n",
873 *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
874 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
878 /* try calling the ibm,client-architecture-support method */
879 prom_printf("Calling ibm,client-architecture-support...");
880 if (call_prom_ret("call-method", 3, 2, &ret,
881 ADDR("ibm,client-architecture-support"),
883 ADDR(ibm_architecture_vec)) == 0) {
884 /* the call exists... */
886 prom_printf("\nWARNING: ibm,client-architecture"
887 "-support call FAILED!\n");
888 call_prom("close", 1, 0, root);
889 prom_printf(" done\n");
892 call_prom("close", 1, 0, root);
893 prom_printf(" not implemented\n");
896 /* no ibm,client-architecture-support call, try the old way */
897 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
898 if (elfloader == 0) {
899 prom_printf("couldn't open /packages/elf-loader\n");
902 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
903 elfloader, ADDR(&fake_elf));
904 call_prom("close", 1, 0, elfloader);
909 * Memory allocation strategy... our layout is normally:
911 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
912 * rare cases, initrd might end up being before the kernel though.
913 * We assume this won't override the final kernel at 0, we have no
914 * provision to handle that in this version, but it should hopefully
917 * alloc_top is set to the top of RMO, eventually shrink down if the
920 * alloc_bottom is set to the top of kernel/initrd
922 * from there, allocations are done this way : rtas is allocated
923 * topmost, and the device-tree is allocated from the bottom. We try
924 * to grow the device-tree allocation as we progress. If we can't,
925 * then we fail, we don't currently have a facility to restart
926 * elsewhere, but that shouldn't be necessary.
928 * Note that calls to reserve_mem have to be done explicitly, memory
929 * allocated with either alloc_up or alloc_down isn't automatically
935 * Allocates memory in the RMO upward from the kernel/initrd
937 * When align is 0, this is a special case, it means to allocate in place
938 * at the current location of alloc_bottom or fail (that is basically
939 * extending the previous allocation). Used for the device-tree flattening
941 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
943 unsigned long base = alloc_bottom;
944 unsigned long addr = 0;
947 base = _ALIGN_UP(base, align);
948 prom_debug("alloc_up(%x, %x)\n", size, align);
950 prom_panic("alloc_up() called with mem not initialized\n");
953 base = _ALIGN_UP(alloc_bottom, align);
957 for(; (base + size) <= alloc_top;
958 base = _ALIGN_UP(base + 0x100000, align)) {
959 prom_debug(" trying: 0x%x\n\r", base);
960 addr = (unsigned long)prom_claim(base, size, 0);
961 if (addr != PROM_ERROR && addr != 0)
969 alloc_bottom = addr + size;
971 prom_debug(" -> %x\n", addr);
972 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
973 prom_debug(" alloc_top : %x\n", alloc_top);
974 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
975 prom_debug(" rmo_top : %x\n", rmo_top);
976 prom_debug(" ram_top : %x\n", ram_top);
982 * Allocates memory downward, either from top of RMO, or if highmem
983 * is set, from the top of RAM. Note that this one doesn't handle
984 * failures. It does claim memory if highmem is not set.
986 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
989 unsigned long base, addr = 0;
991 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
992 highmem ? "(high)" : "(low)");
994 prom_panic("alloc_down() called with mem not initialized\n");
997 /* Carve out storage for the TCE table. */
998 addr = _ALIGN_DOWN(alloc_top_high - size, align);
999 if (addr <= alloc_bottom)
1001 /* Will we bump into the RMO ? If yes, check out that we
1002 * didn't overlap existing allocations there, if we did,
1003 * we are dead, we must be the first in town !
1005 if (addr < rmo_top) {
1006 /* Good, we are first */
1007 if (alloc_top == rmo_top)
1008 alloc_top = rmo_top = addr;
1012 alloc_top_high = addr;
1016 base = _ALIGN_DOWN(alloc_top - size, align);
1017 for (; base > alloc_bottom;
1018 base = _ALIGN_DOWN(base - 0x100000, align)) {
1019 prom_debug(" trying: 0x%x\n\r", base);
1020 addr = (unsigned long)prom_claim(base, size, 0);
1021 if (addr != PROM_ERROR && addr != 0)
1030 prom_debug(" -> %x\n", addr);
1031 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1032 prom_debug(" alloc_top : %x\n", alloc_top);
1033 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1034 prom_debug(" rmo_top : %x\n", rmo_top);
1035 prom_debug(" ram_top : %x\n", ram_top);
1041 * Parse a "reg" cell
1043 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1046 unsigned long r = 0;
1048 /* Ignore more than 2 cells */
1049 while (s > sizeof(unsigned long) / 4) {
1065 * Very dumb function for adding to the memory reserve list, but
1066 * we don't need anything smarter at this point
1068 * XXX Eventually check for collisions. They should NEVER happen.
1069 * If problems seem to show up, it would be a good start to track
1072 static void __init reserve_mem(u64 base, u64 size)
1074 u64 top = base + size;
1075 unsigned long cnt = mem_reserve_cnt;
1080 /* We need to always keep one empty entry so that we
1081 * have our terminator with "size" set to 0 since we are
1082 * dumb and just copy this entire array to the boot params
1084 base = _ALIGN_DOWN(base, PAGE_SIZE);
1085 top = _ALIGN_UP(top, PAGE_SIZE);
1088 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1089 prom_panic("Memory reserve map exhausted !\n");
1090 mem_reserve_map[cnt].base = base;
1091 mem_reserve_map[cnt].size = size;
1092 mem_reserve_cnt = cnt + 1;
1096 * Initialize memory allocation mechanism, parse "memory" nodes and
1097 * obtain that way the top of memory and RMO to setup out local allocator
1099 static void __init prom_init_mem(void)
1102 char *path, type[64];
1108 * We iterate the memory nodes to find
1109 * 1) top of RMO (first node)
1113 prom_getprop(prom.root, "#address-cells", &rac, sizeof(rac));
1115 prom_getprop(prom.root, "#size-cells", &rsc, sizeof(rsc));
1116 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1117 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1119 prom_debug("scanning memory:\n");
1120 path = prom_scratch;
1122 for (node = 0; prom_next_node(&node); ) {
1124 prom_getprop(node, "device_type", type, sizeof(type));
1128 * CHRP Longtrail machines have no device_type
1129 * on the memory node, so check the name instead...
1131 prom_getprop(node, "name", type, sizeof(type));
1133 if (strcmp(type, "memory"))
1136 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1137 if (plen > sizeof(regbuf)) {
1138 prom_printf("memory node too large for buffer !\n");
1139 plen = sizeof(regbuf);
1142 endp = p + (plen / sizeof(cell_t));
1145 memset(path, 0, PROM_SCRATCH_SIZE);
1146 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1147 prom_debug(" node %s :\n", path);
1148 #endif /* DEBUG_PROM */
1150 while ((endp - p) >= (rac + rsc)) {
1151 unsigned long base, size;
1153 base = prom_next_cell(rac, &p);
1154 size = prom_next_cell(rsc, &p);
1158 prom_debug(" %x %x\n", base, size);
1159 if (base == 0 && (of_platform & PLATFORM_LPAR))
1161 if ((base + size) > ram_top)
1162 ram_top = base + size;
1166 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1169 * If prom_memory_limit is set we reduce the upper limits *except* for
1170 * alloc_top_high. This must be the real top of RAM so we can put
1174 alloc_top_high = ram_top;
1176 if (prom_memory_limit) {
1177 if (prom_memory_limit <= alloc_bottom) {
1178 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1180 prom_memory_limit = 0;
1181 } else if (prom_memory_limit >= ram_top) {
1182 prom_printf("Ignoring mem=%x >= ram_top.\n",
1184 prom_memory_limit = 0;
1186 ram_top = prom_memory_limit;
1187 rmo_top = min(rmo_top, prom_memory_limit);
1192 * Setup our top alloc point, that is top of RMO or top of
1193 * segment 0 when running non-LPAR.
1194 * Some RS64 machines have buggy firmware where claims up at
1195 * 1GB fail. Cap at 768MB as a workaround.
1196 * Since 768MB is plenty of room, and we need to cap to something
1197 * reasonable on 32-bit, cap at 768MB on all machines.
1201 rmo_top = min(0x30000000ul, rmo_top);
1202 alloc_top = rmo_top;
1203 alloc_top_high = ram_top;
1206 * Check if we have an initrd after the kernel but still inside
1207 * the RMO. If we do move our bottom point to after it.
1209 if (prom_initrd_start &&
1210 prom_initrd_start < rmo_top &&
1211 prom_initrd_end > alloc_bottom)
1212 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1214 prom_printf("memory layout at init:\n");
1215 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1216 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1217 prom_printf(" alloc_top : %x\n", alloc_top);
1218 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1219 prom_printf(" rmo_top : %x\n", rmo_top);
1220 prom_printf(" ram_top : %x\n", ram_top);
1223 static void __init prom_close_stdin(void)
1227 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0)
1228 call_prom("close", 1, 0, val);
1231 #ifdef CONFIG_PPC_POWERNV
1233 static u64 __initdata prom_opal_size;
1234 static u64 __initdata prom_opal_align;
1235 static int __initdata prom_rtas_start_cpu;
1236 static u64 __initdata prom_rtas_data;
1237 static u64 __initdata prom_rtas_entry;
1239 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1240 static u64 __initdata prom_opal_base;
1241 static u64 __initdata prom_opal_entry;
1244 /* XXX Don't change this structure without updating opal-takeover.S */
1245 static struct opal_secondary_data {
1248 struct opal_takeover_args args; /* 16 */
1249 } opal_secondary_data;
1251 extern char opal_secondary_entry;
1253 static void __init prom_query_opal(void)
1257 /* We must not query for OPAL presence on a machine that
1258 * supports TNK takeover (970 blades), as this uses the same
1259 * h-call with different arguments and will crash
1261 if (PHANDLE_VALID(call_prom("finddevice", 1, 1,
1262 ADDR("/tnk-memory-map")))) {
1263 prom_printf("TNK takeover detected, skipping OPAL check\n");
1267 prom_printf("Querying for OPAL presence... ");
1268 rc = opal_query_takeover(&prom_opal_size,
1270 prom_debug("(rc = %ld) ", rc);
1272 prom_printf("not there.\n");
1275 of_platform = PLATFORM_OPAL;
1276 prom_printf(" there !\n");
1277 prom_debug(" opal_size = 0x%lx\n", prom_opal_size);
1278 prom_debug(" opal_align = 0x%lx\n", prom_opal_align);
1279 if (prom_opal_align < 0x10000)
1280 prom_opal_align = 0x10000;
1283 static int prom_rtas_call(int token, int nargs, int nret, int *outputs, ...)
1285 struct rtas_args rtas_args;
1289 rtas_args.token = token;
1290 rtas_args.nargs = nargs;
1291 rtas_args.nret = nret;
1292 rtas_args.rets = (rtas_arg_t *)&(rtas_args.args[nargs]);
1293 va_start(list, outputs);
1294 for (i = 0; i < nargs; ++i)
1295 rtas_args.args[i] = va_arg(list, rtas_arg_t);
1298 for (i = 0; i < nret; ++i)
1299 rtas_args.rets[i] = 0;
1301 opal_enter_rtas(&rtas_args, prom_rtas_data,
1304 if (nret > 1 && outputs != NULL)
1305 for (i = 0; i < nret-1; ++i)
1306 outputs[i] = rtas_args.rets[i+1];
1307 return (nret > 0)? rtas_args.rets[0]: 0;
1310 static void __init prom_opal_hold_cpus(void)
1312 int i, cnt, cpu, rc;
1317 void *entry = (unsigned long *)&opal_secondary_entry;
1318 struct opal_secondary_data *data = &opal_secondary_data;
1320 prom_debug("prom_opal_hold_cpus: start...\n");
1321 prom_debug(" - entry = 0x%x\n", entry);
1322 prom_debug(" - data = 0x%x\n", data);
1328 for (node = 0; prom_next_node(&node); ) {
1330 prom_getprop(node, "device_type", type, sizeof(type));
1331 if (strcmp(type, "cpu") != 0)
1334 /* Skip non-configured cpus. */
1335 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1336 if (strcmp(type, "okay") != 0)
1339 cnt = prom_getprop(node, "ibm,ppc-interrupt-server#s", servers,
1341 if (cnt == PROM_ERROR)
1344 for (i = 0; i < cnt; i++) {
1346 prom_debug("CPU %d ... ", cpu);
1347 if (cpu == prom.cpu) {
1348 prom_debug("booted !\n");
1351 prom_debug("starting ... ");
1353 /* Init the acknowledge var which will be reset by
1354 * the secondary cpu when it awakens from its OF
1358 rc = prom_rtas_call(prom_rtas_start_cpu, 3, 1,
1359 NULL, cpu, entry, data);
1360 prom_debug("rtas rc=%d ...", rc);
1362 for (j = 0; j < 100000000 && data->ack == -1; j++) {
1367 if (data->ack != -1)
1368 prom_debug("done, PIR=0x%x\n", data->ack);
1370 prom_debug("timeout !\n");
1373 prom_debug("prom_opal_hold_cpus: end...\n");
1376 static void __init prom_opal_takeover(void)
1378 struct opal_secondary_data *data = &opal_secondary_data;
1379 struct opal_takeover_args *args = &data->args;
1380 u64 align = prom_opal_align;
1381 u64 top_addr, opal_addr;
1383 args->k_image = (u64)_stext;
1384 args->k_size = _end - _stext;
1386 args->k_entry2 = 0x60;
1388 top_addr = _ALIGN_UP(args->k_size, align);
1390 if (prom_initrd_start != 0) {
1391 args->rd_image = prom_initrd_start;
1392 args->rd_size = prom_initrd_end - args->rd_image;
1393 args->rd_loc = top_addr;
1394 top_addr = _ALIGN_UP(args->rd_loc + args->rd_size, align);
1397 /* Pickup an address for the HAL. We want to go really high
1398 * up to avoid problem with future kexecs. On the other hand
1399 * we don't want to be all over the TCEs on P5IOC2 machines
1400 * which are going to be up there too. We assume the machine
1401 * has plenty of memory, and we ask for the HAL for now to
1402 * be just below the 1G point, or above the initrd
1404 opal_addr = _ALIGN_DOWN(0x40000000 - prom_opal_size, align);
1405 if (opal_addr < top_addr)
1406 opal_addr = top_addr;
1407 args->hal_addr = opal_addr;
1409 /* Copy the command line to the kernel image */
1410 strlcpy(boot_command_line, prom_cmd_line,
1413 prom_debug(" k_image = 0x%lx\n", args->k_image);
1414 prom_debug(" k_size = 0x%lx\n", args->k_size);
1415 prom_debug(" k_entry = 0x%lx\n", args->k_entry);
1416 prom_debug(" k_entry2 = 0x%lx\n", args->k_entry2);
1417 prom_debug(" hal_addr = 0x%lx\n", args->hal_addr);
1418 prom_debug(" rd_image = 0x%lx\n", args->rd_image);
1419 prom_debug(" rd_size = 0x%lx\n", args->rd_size);
1420 prom_debug(" rd_loc = 0x%lx\n", args->rd_loc);
1421 prom_printf("Performing OPAL takeover,this can take a few minutes..\n");
1426 opal_do_takeover(args);
1430 * Allocate room for and instantiate OPAL
1432 static void __init prom_instantiate_opal(void)
1437 u64 size = 0, align = 0x10000;
1440 prom_debug("prom_instantiate_opal: start...\n");
1442 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1443 prom_debug("opal_node: %x\n", opal_node);
1444 if (!PHANDLE_VALID(opal_node))
1447 prom_getprop(opal_node, "opal-runtime-size", &size, sizeof(size));
1450 prom_getprop(opal_node, "opal-runtime-alignment", &align,
1453 base = alloc_down(size, align, 0);
1455 prom_printf("OPAL allocation failed !\n");
1459 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1460 if (!IHANDLE_VALID(opal_inst)) {
1461 prom_printf("opening opal package failed (%x)\n", opal_inst);
1465 prom_printf("instantiating opal at 0x%x...", base);
1467 if (call_prom_ret("call-method", 4, 3, rets,
1468 ADDR("load-opal-runtime"),
1470 base >> 32, base & 0xffffffff) != 0
1471 || (rets[0] == 0 && rets[1] == 0)) {
1472 prom_printf(" failed\n");
1475 entry = (((u64)rets[0]) << 32) | rets[1];
1477 prom_printf(" done\n");
1479 reserve_mem(base, size);
1481 prom_debug("opal base = 0x%x\n", base);
1482 prom_debug("opal align = 0x%x\n", align);
1483 prom_debug("opal entry = 0x%x\n", entry);
1484 prom_debug("opal size = 0x%x\n", (long)size);
1486 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1487 &base, sizeof(base));
1488 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1489 &entry, sizeof(entry));
1491 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1492 prom_opal_base = base;
1493 prom_opal_entry = entry;
1495 prom_debug("prom_instantiate_opal: end...\n");
1498 #endif /* CONFIG_PPC_POWERNV */
1501 * Allocate room for and instantiate RTAS
1503 static void __init prom_instantiate_rtas(void)
1507 u32 base, entry = 0;
1510 prom_debug("prom_instantiate_rtas: start...\n");
1512 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1513 prom_debug("rtas_node: %x\n", rtas_node);
1514 if (!PHANDLE_VALID(rtas_node))
1517 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1521 base = alloc_down(size, PAGE_SIZE, 0);
1523 prom_panic("Could not allocate memory for RTAS\n");
1525 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1526 if (!IHANDLE_VALID(rtas_inst)) {
1527 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1531 prom_printf("instantiating rtas at 0x%x...", base);
1533 if (call_prom_ret("call-method", 3, 2, &entry,
1534 ADDR("instantiate-rtas"),
1535 rtas_inst, base) != 0
1537 prom_printf(" failed\n");
1540 prom_printf(" done\n");
1542 reserve_mem(base, size);
1544 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1545 &base, sizeof(base));
1546 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1547 &entry, sizeof(entry));
1549 #ifdef CONFIG_PPC_POWERNV
1550 /* PowerVN takeover hack */
1551 prom_rtas_data = base;
1552 prom_rtas_entry = entry;
1553 prom_getprop(rtas_node, "start-cpu", &prom_rtas_start_cpu, 4);
1555 prom_debug("rtas base = 0x%x\n", base);
1556 prom_debug("rtas entry = 0x%x\n", entry);
1557 prom_debug("rtas size = 0x%x\n", (long)size);
1559 prom_debug("prom_instantiate_rtas: end...\n");
1564 * Allocate room for and instantiate Stored Measurement Log (SML)
1566 static void __init prom_instantiate_sml(void)
1568 phandle ibmvtpm_node;
1569 ihandle ibmvtpm_inst;
1570 u32 entry = 0, size = 0;
1573 prom_debug("prom_instantiate_sml: start...\n");
1575 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/ibm,vtpm"));
1576 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1577 if (!PHANDLE_VALID(ibmvtpm_node))
1580 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/ibm,vtpm"));
1581 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1582 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1586 if (call_prom_ret("call-method", 2, 2, &size,
1587 ADDR("sml-get-handover-size"),
1588 ibmvtpm_inst) != 0 || size == 0) {
1589 prom_printf("SML get handover size failed\n");
1593 base = alloc_down(size, PAGE_SIZE, 0);
1595 prom_panic("Could not allocate memory for sml\n");
1597 prom_printf("instantiating sml at 0x%x...", base);
1599 if (call_prom_ret("call-method", 4, 2, &entry,
1600 ADDR("sml-handover"),
1601 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1602 prom_printf("SML handover failed\n");
1605 prom_printf(" done\n");
1607 reserve_mem(base, size);
1609 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-base",
1610 &base, sizeof(base));
1611 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-size",
1612 &size, sizeof(size));
1614 prom_debug("sml base = 0x%x\n", base);
1615 prom_debug("sml size = 0x%x\n", (long)size);
1617 prom_debug("prom_instantiate_sml: end...\n");
1621 * Allocate room for and initialize TCE tables
1623 static void __init prom_initialize_tce_table(void)
1627 char compatible[64], type[64], model[64];
1628 char *path = prom_scratch;
1630 u32 minalign, minsize;
1631 u64 tce_entry, *tce_entryp;
1632 u64 local_alloc_top, local_alloc_bottom;
1638 prom_debug("starting prom_initialize_tce_table\n");
1640 /* Cache current top of allocs so we reserve a single block */
1641 local_alloc_top = alloc_top_high;
1642 local_alloc_bottom = local_alloc_top;
1644 /* Search all nodes looking for PHBs. */
1645 for (node = 0; prom_next_node(&node); ) {
1649 prom_getprop(node, "compatible",
1650 compatible, sizeof(compatible));
1651 prom_getprop(node, "device_type", type, sizeof(type));
1652 prom_getprop(node, "model", model, sizeof(model));
1654 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1657 /* Keep the old logic intact to avoid regression. */
1658 if (compatible[0] != 0) {
1659 if ((strstr(compatible, "python") == NULL) &&
1660 (strstr(compatible, "Speedwagon") == NULL) &&
1661 (strstr(compatible, "Winnipeg") == NULL))
1663 } else if (model[0] != 0) {
1664 if ((strstr(model, "ython") == NULL) &&
1665 (strstr(model, "peedwagon") == NULL) &&
1666 (strstr(model, "innipeg") == NULL))
1670 if (prom_getprop(node, "tce-table-minalign", &minalign,
1671 sizeof(minalign)) == PROM_ERROR)
1673 if (prom_getprop(node, "tce-table-minsize", &minsize,
1674 sizeof(minsize)) == PROM_ERROR)
1675 minsize = 4UL << 20;
1678 * Even though we read what OF wants, we just set the table
1679 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1680 * By doing this, we avoid the pitfalls of trying to DMA to
1681 * MMIO space and the DMA alias hole.
1683 * On POWER4, firmware sets the TCE region by assuming
1684 * each TCE table is 8MB. Using this memory for anything
1685 * else will impact performance, so we always allocate 8MB.
1688 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1689 minsize = 8UL << 20;
1691 minsize = 4UL << 20;
1693 /* Align to the greater of the align or size */
1694 align = max(minalign, minsize);
1695 base = alloc_down(minsize, align, 1);
1697 prom_panic("ERROR, cannot find space for TCE table.\n");
1698 if (base < local_alloc_bottom)
1699 local_alloc_bottom = base;
1701 /* It seems OF doesn't null-terminate the path :-( */
1702 memset(path, 0, PROM_SCRATCH_SIZE);
1703 /* Call OF to setup the TCE hardware */
1704 if (call_prom("package-to-path", 3, 1, node,
1705 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1706 prom_printf("package-to-path failed\n");
1709 /* Save away the TCE table attributes for later use. */
1710 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1711 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1713 prom_debug("TCE table: %s\n", path);
1714 prom_debug("\tnode = 0x%x\n", node);
1715 prom_debug("\tbase = 0x%x\n", base);
1716 prom_debug("\tsize = 0x%x\n", minsize);
1718 /* Initialize the table to have a one-to-one mapping
1719 * over the allocated size.
1721 tce_entryp = (u64 *)base;
1722 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1723 tce_entry = (i << PAGE_SHIFT);
1725 *tce_entryp = tce_entry;
1728 prom_printf("opening PHB %s", path);
1729 phb_node = call_prom("open", 1, 1, path);
1731 prom_printf("... failed\n");
1733 prom_printf("... done\n");
1735 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1736 phb_node, -1, minsize,
1737 (u32) base, (u32) (base >> 32));
1738 call_prom("close", 1, 0, phb_node);
1741 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1743 /* These are only really needed if there is a memory limit in
1744 * effect, but we don't know so export them always. */
1745 prom_tce_alloc_start = local_alloc_bottom;
1746 prom_tce_alloc_end = local_alloc_top;
1748 /* Flag the first invalid entry */
1749 prom_debug("ending prom_initialize_tce_table\n");
1754 * With CHRP SMP we need to use the OF to start the other processors.
1755 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1756 * so we have to put the processors into a holding pattern controlled
1757 * by the kernel (not OF) before we destroy the OF.
1759 * This uses a chunk of low memory, puts some holding pattern
1760 * code there and sends the other processors off to there until
1761 * smp_boot_cpus tells them to do something. The holding pattern
1762 * checks that address until its cpu # is there, when it is that
1763 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1764 * of setting those values.
1766 * We also use physical address 0x4 here to tell when a cpu
1767 * is in its holding pattern code.
1772 * We want to reference the copy of __secondary_hold_* in the
1773 * 0 - 0x100 address range
1775 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1777 static void __init prom_hold_cpus(void)
1783 unsigned long *spinloop
1784 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1785 unsigned long *acknowledge
1786 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1787 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1789 prom_debug("prom_hold_cpus: start...\n");
1790 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1791 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1792 prom_debug(" 1) acknowledge = 0x%x\n",
1793 (unsigned long)acknowledge);
1794 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1795 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1797 /* Set the common spinloop variable, so all of the secondary cpus
1798 * will block when they are awakened from their OF spinloop.
1799 * This must occur for both SMP and non SMP kernels, since OF will
1800 * be trashed when we move the kernel.
1805 for (node = 0; prom_next_node(&node); ) {
1807 prom_getprop(node, "device_type", type, sizeof(type));
1808 if (strcmp(type, "cpu") != 0)
1811 /* Skip non-configured cpus. */
1812 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1813 if (strcmp(type, "okay") != 0)
1817 prom_getprop(node, "reg", ®, sizeof(reg));
1819 prom_debug("cpu hw idx = %lu\n", reg);
1821 /* Init the acknowledge var which will be reset by
1822 * the secondary cpu when it awakens from its OF
1825 *acknowledge = (unsigned long)-1;
1827 if (reg != prom.cpu) {
1828 /* Primary Thread of non-boot cpu or any thread */
1829 prom_printf("starting cpu hw idx %lu... ", reg);
1830 call_prom("start-cpu", 3, 0, node,
1831 secondary_hold, reg);
1833 for (i = 0; (i < 100000000) &&
1834 (*acknowledge == ((unsigned long)-1)); i++ )
1837 if (*acknowledge == reg)
1838 prom_printf("done\n");
1840 prom_printf("failed: %x\n", *acknowledge);
1844 prom_printf("boot cpu hw idx %lu\n", reg);
1845 #endif /* CONFIG_SMP */
1848 prom_debug("prom_hold_cpus: end...\n");
1852 static void __init prom_init_client_services(unsigned long pp)
1854 /* Get a handle to the prom entry point before anything else */
1857 /* get a handle for the stdout device */
1858 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1859 if (!PHANDLE_VALID(prom.chosen))
1860 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1862 /* get device tree root */
1863 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1864 if (!PHANDLE_VALID(prom.root))
1865 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1872 * For really old powermacs, we need to map things we claim.
1873 * For that, we need the ihandle of the mmu.
1874 * Also, on the longtrail, we need to work around other bugs.
1876 static void __init prom_find_mmu(void)
1881 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1882 if (!PHANDLE_VALID(oprom))
1884 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1886 version[sizeof(version) - 1] = 0;
1887 /* XXX might need to add other versions here */
1888 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1889 of_workarounds = OF_WA_CLAIM;
1890 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1891 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1892 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1895 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1896 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1897 sizeof(prom.mmumap));
1898 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1899 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1902 #define prom_find_mmu()
1905 static void __init prom_init_stdout(void)
1907 char *path = of_stdout_device;
1911 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1912 prom_panic("cannot find stdout");
1916 /* Get the full OF pathname of the stdout device */
1917 memset(path, 0, 256);
1918 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1919 val = call_prom("instance-to-package", 1, 1, prom.stdout);
1920 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1922 prom_printf("OF stdout device is: %s\n", of_stdout_device);
1923 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1924 path, strlen(path) + 1);
1926 /* If it's a display, note it */
1927 memset(type, 0, sizeof(type));
1928 prom_getprop(val, "device_type", type, sizeof(type));
1929 if (strcmp(type, "display") == 0)
1930 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1933 static int __init prom_find_machine_type(void)
1942 /* Look for a PowerMac or a Cell */
1943 len = prom_getprop(prom.root, "compatible",
1944 compat, sizeof(compat)-1);
1948 char *p = &compat[i];
1952 if (strstr(p, "Power Macintosh") ||
1953 strstr(p, "MacRISC"))
1954 return PLATFORM_POWERMAC;
1956 /* We must make sure we don't detect the IBM Cell
1957 * blades as pSeries due to some firmware issues,
1960 if (strstr(p, "IBM,CBEA") ||
1961 strstr(p, "IBM,CPBW-1.0"))
1962 return PLATFORM_GENERIC;
1963 #endif /* CONFIG_PPC64 */
1968 /* Try to detect OPAL */
1969 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1970 return PLATFORM_OPAL;
1972 /* Try to figure out if it's an IBM pSeries or any other
1973 * PAPR compliant platform. We assume it is if :
1974 * - /device_type is "chrp" (please, do NOT use that for future
1978 len = prom_getprop(prom.root, "device_type",
1979 compat, sizeof(compat)-1);
1981 return PLATFORM_GENERIC;
1982 if (strcmp(compat, "chrp"))
1983 return PLATFORM_GENERIC;
1985 /* Default to pSeries. We need to know if we are running LPAR */
1986 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1987 if (!PHANDLE_VALID(rtas))
1988 return PLATFORM_GENERIC;
1989 x = prom_getproplen(rtas, "ibm,hypertas-functions");
1990 if (x != PROM_ERROR) {
1991 prom_debug("Hypertas detected, assuming LPAR !\n");
1992 return PLATFORM_PSERIES_LPAR;
1994 return PLATFORM_PSERIES;
1996 return PLATFORM_GENERIC;
2000 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2002 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2006 * If we have a display that we don't know how to drive,
2007 * we will want to try to execute OF's open method for it
2008 * later. However, OF will probably fall over if we do that
2009 * we've taken over the MMU.
2010 * So we check whether we will need to open the display,
2011 * and if so, open it now.
2013 static void __init prom_check_displays(void)
2015 char type[16], *path;
2020 static unsigned char default_colors[] = {
2038 const unsigned char *clut;
2040 prom_debug("Looking for displays\n");
2041 for (node = 0; prom_next_node(&node); ) {
2042 memset(type, 0, sizeof(type));
2043 prom_getprop(node, "device_type", type, sizeof(type));
2044 if (strcmp(type, "display") != 0)
2047 /* It seems OF doesn't null-terminate the path :-( */
2048 path = prom_scratch;
2049 memset(path, 0, PROM_SCRATCH_SIZE);
2052 * leave some room at the end of the path for appending extra
2055 if (call_prom("package-to-path", 3, 1, node, path,
2056 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
2058 prom_printf("found display : %s, opening... ", path);
2060 ih = call_prom("open", 1, 1, path);
2062 prom_printf("failed\n");
2067 prom_printf("done\n");
2068 prom_setprop(node, path, "linux,opened", NULL, 0);
2070 /* Setup a usable color table when the appropriate
2071 * method is available. Should update this to set-colors */
2072 clut = default_colors;
2073 for (i = 0; i < 16; i++, clut += 3)
2074 if (prom_set_color(ih, i, clut[0], clut[1],
2078 #ifdef CONFIG_LOGO_LINUX_CLUT224
2079 clut = PTRRELOC(logo_linux_clut224.clut);
2080 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2081 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2084 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2089 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2090 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2091 unsigned long needed, unsigned long align)
2095 *mem_start = _ALIGN(*mem_start, align);
2096 while ((*mem_start + needed) > *mem_end) {
2097 unsigned long room, chunk;
2099 prom_debug("Chunk exhausted, claiming more at %x...\n",
2101 room = alloc_top - alloc_bottom;
2102 if (room > DEVTREE_CHUNK_SIZE)
2103 room = DEVTREE_CHUNK_SIZE;
2104 if (room < PAGE_SIZE)
2105 prom_panic("No memory for flatten_device_tree "
2107 chunk = alloc_up(room, 0);
2109 prom_panic("No memory for flatten_device_tree "
2110 "(claim failed)\n");
2111 *mem_end = chunk + room;
2114 ret = (void *)*mem_start;
2115 *mem_start += needed;
2120 #define dt_push_token(token, mem_start, mem_end) \
2121 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
2123 static unsigned long __init dt_find_string(char *str)
2127 s = os = (char *)dt_string_start;
2129 while (s < (char *)dt_string_end) {
2130 if (strcmp(s, str) == 0)
2138 * The Open Firmware 1275 specification states properties must be 31 bytes or
2139 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2141 #define MAX_PROPERTY_NAME 64
2143 static void __init scan_dt_build_strings(phandle node,
2144 unsigned long *mem_start,
2145 unsigned long *mem_end)
2147 char *prev_name, *namep, *sstart;
2151 sstart = (char *)dt_string_start;
2153 /* get and store all property names */
2156 /* 64 is max len of name including nul. */
2157 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2158 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2159 /* No more nodes: unwind alloc */
2160 *mem_start = (unsigned long)namep;
2165 if (strcmp(namep, "name") == 0) {
2166 *mem_start = (unsigned long)namep;
2170 /* get/create string entry */
2171 soff = dt_find_string(namep);
2173 *mem_start = (unsigned long)namep;
2174 namep = sstart + soff;
2176 /* Trim off some if we can */
2177 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2178 dt_string_end = *mem_start;
2183 /* do all our children */
2184 child = call_prom("child", 1, 1, node);
2185 while (child != 0) {
2186 scan_dt_build_strings(child, mem_start, mem_end);
2187 child = call_prom("peer", 1, 1, child);
2191 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2192 unsigned long *mem_end)
2195 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2197 unsigned char *valp;
2198 static char pname[MAX_PROPERTY_NAME];
2199 int l, room, has_phandle = 0;
2201 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2203 /* get the node's full name */
2204 namep = (char *)*mem_start;
2205 room = *mem_end - *mem_start;
2208 l = call_prom("package-to-path", 3, 1, node, namep, room);
2210 /* Didn't fit? Get more room. */
2212 if (l >= *mem_end - *mem_start)
2213 namep = make_room(mem_start, mem_end, l+1, 1);
2214 call_prom("package-to-path", 3, 1, node, namep, l);
2218 /* Fixup an Apple bug where they have bogus \0 chars in the
2219 * middle of the path in some properties, and extract
2220 * the unit name (everything after the last '/').
2222 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2229 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2232 /* get it again for debugging */
2233 path = prom_scratch;
2234 memset(path, 0, PROM_SCRATCH_SIZE);
2235 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2237 /* get and store all properties */
2239 sstart = (char *)dt_string_start;
2241 if (call_prom("nextprop", 3, 1, node, prev_name,
2246 if (strcmp(pname, "name") == 0) {
2251 /* find string offset */
2252 soff = dt_find_string(pname);
2254 prom_printf("WARNING: Can't find string index for"
2255 " <%s>, node %s\n", pname, path);
2258 prev_name = sstart + soff;
2261 l = call_prom("getproplen", 2, 1, node, pname);
2264 if (l == PROM_ERROR)
2267 /* push property head */
2268 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2269 dt_push_token(l, mem_start, mem_end);
2270 dt_push_token(soff, mem_start, mem_end);
2272 /* push property content */
2273 valp = make_room(mem_start, mem_end, l, 4);
2274 call_prom("getprop", 4, 1, node, pname, valp, l);
2275 *mem_start = _ALIGN(*mem_start, 4);
2277 if (!strcmp(pname, "phandle"))
2281 /* Add a "linux,phandle" property if no "phandle" property already
2282 * existed (can happen with OPAL)
2285 soff = dt_find_string("linux,phandle");
2287 prom_printf("WARNING: Can't find string index for"
2288 " <linux-phandle> node %s\n", path);
2290 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2291 dt_push_token(4, mem_start, mem_end);
2292 dt_push_token(soff, mem_start, mem_end);
2293 valp = make_room(mem_start, mem_end, 4, 4);
2294 *(u32 *)valp = node;
2298 /* do all our children */
2299 child = call_prom("child", 1, 1, node);
2300 while (child != 0) {
2301 scan_dt_build_struct(child, mem_start, mem_end);
2302 child = call_prom("peer", 1, 1, child);
2305 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2308 static void __init flatten_device_tree(void)
2311 unsigned long mem_start, mem_end, room;
2312 struct boot_param_header *hdr;
2317 * Check how much room we have between alloc top & bottom (+/- a
2318 * few pages), crop to 1MB, as this is our "chunk" size
2320 room = alloc_top - alloc_bottom - 0x4000;
2321 if (room > DEVTREE_CHUNK_SIZE)
2322 room = DEVTREE_CHUNK_SIZE;
2323 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2325 /* Now try to claim that */
2326 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2328 prom_panic("Can't allocate initial device-tree chunk\n");
2329 mem_end = mem_start + room;
2331 /* Get root of tree */
2332 root = call_prom("peer", 1, 1, (phandle)0);
2333 if (root == (phandle)0)
2334 prom_panic ("couldn't get device tree root\n");
2336 /* Build header and make room for mem rsv map */
2337 mem_start = _ALIGN(mem_start, 4);
2338 hdr = make_room(&mem_start, &mem_end,
2339 sizeof(struct boot_param_header), 4);
2340 dt_header_start = (unsigned long)hdr;
2341 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2343 /* Start of strings */
2344 mem_start = PAGE_ALIGN(mem_start);
2345 dt_string_start = mem_start;
2346 mem_start += 4; /* hole */
2348 /* Add "linux,phandle" in there, we'll need it */
2349 namep = make_room(&mem_start, &mem_end, 16, 1);
2350 strcpy(namep, "linux,phandle");
2351 mem_start = (unsigned long)namep + strlen(namep) + 1;
2353 /* Build string array */
2354 prom_printf("Building dt strings...\n");
2355 scan_dt_build_strings(root, &mem_start, &mem_end);
2356 dt_string_end = mem_start;
2358 /* Build structure */
2359 mem_start = PAGE_ALIGN(mem_start);
2360 dt_struct_start = mem_start;
2361 prom_printf("Building dt structure...\n");
2362 scan_dt_build_struct(root, &mem_start, &mem_end);
2363 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2364 dt_struct_end = PAGE_ALIGN(mem_start);
2367 hdr->boot_cpuid_phys = prom.cpu;
2368 hdr->magic = OF_DT_HEADER;
2369 hdr->totalsize = dt_struct_end - dt_header_start;
2370 hdr->off_dt_struct = dt_struct_start - dt_header_start;
2371 hdr->off_dt_strings = dt_string_start - dt_header_start;
2372 hdr->dt_strings_size = dt_string_end - dt_string_start;
2373 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - dt_header_start;
2374 hdr->version = OF_DT_VERSION;
2375 /* Version 16 is not backward compatible */
2376 hdr->last_comp_version = 0x10;
2378 /* Copy the reserve map in */
2379 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2384 prom_printf("reserved memory map:\n");
2385 for (i = 0; i < mem_reserve_cnt; i++)
2386 prom_printf(" %x - %x\n",
2387 mem_reserve_map[i].base,
2388 mem_reserve_map[i].size);
2391 /* Bump mem_reserve_cnt to cause further reservations to fail
2392 * since it's too late.
2394 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2396 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2397 dt_string_start, dt_string_end);
2398 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2399 dt_struct_start, dt_struct_end);
2403 #ifdef CONFIG_PPC_MAPLE
2404 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2405 * The values are bad, and it doesn't even have the right number of cells. */
2406 static void __init fixup_device_tree_maple(void)
2409 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2413 name = "/ht@0/isa@4";
2414 isa = call_prom("finddevice", 1, 1, ADDR(name));
2415 if (!PHANDLE_VALID(isa)) {
2416 name = "/ht@0/isa@6";
2417 isa = call_prom("finddevice", 1, 1, ADDR(name));
2418 rloc = 0x01003000; /* IO space; PCI device = 6 */
2420 if (!PHANDLE_VALID(isa))
2423 if (prom_getproplen(isa, "ranges") != 12)
2425 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2429 if (isa_ranges[0] != 0x1 ||
2430 isa_ranges[1] != 0xf4000000 ||
2431 isa_ranges[2] != 0x00010000)
2434 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2436 isa_ranges[0] = 0x1;
2437 isa_ranges[1] = 0x0;
2438 isa_ranges[2] = rloc;
2439 isa_ranges[3] = 0x0;
2440 isa_ranges[4] = 0x0;
2441 isa_ranges[5] = 0x00010000;
2442 prom_setprop(isa, name, "ranges",
2443 isa_ranges, sizeof(isa_ranges));
2446 #define CPC925_MC_START 0xf8000000
2447 #define CPC925_MC_LENGTH 0x1000000
2448 /* The values for memory-controller don't have right number of cells */
2449 static void __init fixup_device_tree_maple_memory_controller(void)
2453 char *name = "/hostbridge@f8000000";
2456 mc = call_prom("finddevice", 1, 1, ADDR(name));
2457 if (!PHANDLE_VALID(mc))
2460 if (prom_getproplen(mc, "reg") != 8)
2463 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2464 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2465 if ((ac != 2) || (sc != 2))
2468 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2471 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2474 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2477 mc_reg[1] = CPC925_MC_START;
2479 mc_reg[3] = CPC925_MC_LENGTH;
2480 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2483 #define fixup_device_tree_maple()
2484 #define fixup_device_tree_maple_memory_controller()
2487 #ifdef CONFIG_PPC_CHRP
2489 * Pegasos and BriQ lacks the "ranges" property in the isa node
2490 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2491 * Pegasos has the IDE configured in legacy mode, but advertised as native
2493 static void __init fixup_device_tree_chrp(void)
2497 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2501 name = "/pci@80000000/isa@c";
2502 ph = call_prom("finddevice", 1, 1, ADDR(name));
2503 if (!PHANDLE_VALID(ph)) {
2504 name = "/pci@ff500000/isa@6";
2505 ph = call_prom("finddevice", 1, 1, ADDR(name));
2506 rloc = 0x01003000; /* IO space; PCI device = 6 */
2508 if (PHANDLE_VALID(ph)) {
2509 rc = prom_getproplen(ph, "ranges");
2510 if (rc == 0 || rc == PROM_ERROR) {
2511 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2518 prop[5] = 0x00010000;
2519 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2523 name = "/pci@80000000/ide@C,1";
2524 ph = call_prom("finddevice", 1, 1, ADDR(name));
2525 if (PHANDLE_VALID(ph)) {
2526 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2529 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2530 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2531 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2532 if (rc == sizeof(u32)) {
2534 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2539 #define fixup_device_tree_chrp()
2542 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2543 static void __init fixup_device_tree_pmac(void)
2545 phandle u3, i2c, mpic;
2550 /* Some G5s have a missing interrupt definition, fix it up here */
2551 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2552 if (!PHANDLE_VALID(u3))
2554 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2555 if (!PHANDLE_VALID(i2c))
2557 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2558 if (!PHANDLE_VALID(mpic))
2561 /* check if proper rev of u3 */
2562 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2565 if (u3_rev < 0x35 || u3_rev > 0x39)
2567 /* does it need fixup ? */
2568 if (prom_getproplen(i2c, "interrupts") > 0)
2571 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2573 /* interrupt on this revision of u3 is number 0 and level */
2576 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2577 &interrupts, sizeof(interrupts));
2579 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2580 &parent, sizeof(parent));
2583 #define fixup_device_tree_pmac()
2586 #ifdef CONFIG_PPC_EFIKA
2588 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2589 * to talk to the phy. If the phy-handle property is missing, then this
2590 * function is called to add the appropriate nodes and link it to the
2593 static void __init fixup_device_tree_efika_add_phy(void)
2599 /* Check if /builtin/ethernet exists - bail if it doesn't */
2600 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2601 if (!PHANDLE_VALID(node))
2604 /* Check if the phy-handle property exists - bail if it does */
2605 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2610 * At this point the ethernet device doesn't have a phy described.
2611 * Now we need to add the missing phy node and linkage
2614 /* Check for an MDIO bus node - if missing then create one */
2615 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2616 if (!PHANDLE_VALID(node)) {
2617 prom_printf("Adding Ethernet MDIO node\n");
2618 call_prom("interpret", 1, 1,
2619 " s\" /builtin\" find-device"
2621 " 1 encode-int s\" #address-cells\" property"
2622 " 0 encode-int s\" #size-cells\" property"
2623 " s\" mdio\" device-name"
2624 " s\" fsl,mpc5200b-mdio\" encode-string"
2625 " s\" compatible\" property"
2626 " 0xf0003000 0x400 reg"
2628 " 0x5 encode-int encode+"
2629 " 0x3 encode-int encode+"
2630 " s\" interrupts\" property"
2634 /* Check for a PHY device node - if missing then create one and
2635 * give it's phandle to the ethernet node */
2636 node = call_prom("finddevice", 1, 1,
2637 ADDR("/builtin/mdio/ethernet-phy"));
2638 if (!PHANDLE_VALID(node)) {
2639 prom_printf("Adding Ethernet PHY node\n");
2640 call_prom("interpret", 1, 1,
2641 " s\" /builtin/mdio\" find-device"
2643 " s\" ethernet-phy\" device-name"
2644 " 0x10 encode-int s\" reg\" property"
2648 " s\" /builtin/ethernet\" find-device"
2650 " s\" phy-handle\" property"
2655 static void __init fixup_device_tree_efika(void)
2657 int sound_irq[3] = { 2, 2, 0 };
2658 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2659 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2660 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2661 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2666 /* Check if we're really running on a EFIKA */
2667 node = call_prom("finddevice", 1, 1, ADDR("/"));
2668 if (!PHANDLE_VALID(node))
2671 rv = prom_getprop(node, "model", prop, sizeof(prop));
2672 if (rv == PROM_ERROR)
2674 if (strcmp(prop, "EFIKA5K2"))
2677 prom_printf("Applying EFIKA device tree fixups\n");
2679 /* Claiming to be 'chrp' is death */
2680 node = call_prom("finddevice", 1, 1, ADDR("/"));
2681 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2682 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2683 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2685 /* CODEGEN,description is exposed in /proc/cpuinfo so
2687 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2688 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2689 prom_setprop(node, "/", "CODEGEN,description",
2690 "Efika 5200B PowerPC System",
2691 sizeof("Efika 5200B PowerPC System"));
2693 /* Fixup bestcomm interrupts property */
2694 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2695 if (PHANDLE_VALID(node)) {
2696 len = prom_getproplen(node, "interrupts");
2698 prom_printf("Fixing bestcomm interrupts property\n");
2699 prom_setprop(node, "/builtin/bestcom", "interrupts",
2700 bcomm_irq, sizeof(bcomm_irq));
2704 /* Fixup sound interrupts property */
2705 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2706 if (PHANDLE_VALID(node)) {
2707 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2708 if (rv == PROM_ERROR) {
2709 prom_printf("Adding sound interrupts property\n");
2710 prom_setprop(node, "/builtin/sound", "interrupts",
2711 sound_irq, sizeof(sound_irq));
2715 /* Make sure ethernet phy-handle property exists */
2716 fixup_device_tree_efika_add_phy();
2719 #define fixup_device_tree_efika()
2722 static void __init fixup_device_tree(void)
2724 fixup_device_tree_maple();
2725 fixup_device_tree_maple_memory_controller();
2726 fixup_device_tree_chrp();
2727 fixup_device_tree_pmac();
2728 fixup_device_tree_efika();
2731 static void __init prom_find_boot_cpu(void)
2738 if (prom_getprop(prom.chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2741 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2743 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2744 prom.cpu = getprop_rval;
2746 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2749 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2751 #ifdef CONFIG_BLK_DEV_INITRD
2752 if (r3 && r4 && r4 != 0xdeadbeef) {
2755 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2756 prom_initrd_end = prom_initrd_start + r4;
2758 val = prom_initrd_start;
2759 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2761 val = prom_initrd_end;
2762 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2765 reserve_mem(prom_initrd_start,
2766 prom_initrd_end - prom_initrd_start);
2768 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2769 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2771 #endif /* CONFIG_BLK_DEV_INITRD */
2775 #ifdef CONFIG_RELOCATABLE
2776 static void reloc_toc(void)
2780 static void unreloc_toc(void)
2784 static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
2787 unsigned long *toc_entry;
2789 /* Get the start of the TOC by using r2 directly. */
2790 asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));
2792 for (i = 0; i < nr_entries; i++) {
2793 *toc_entry = *toc_entry + offset;
2798 static void reloc_toc(void)
2800 unsigned long offset = reloc_offset();
2801 unsigned long nr_entries =
2802 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2804 __reloc_toc(offset, nr_entries);
2809 static void unreloc_toc(void)
2811 unsigned long offset = reloc_offset();
2812 unsigned long nr_entries =
2813 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2817 __reloc_toc(-offset, nr_entries);
2823 * We enter here early on, when the Open Firmware prom is still
2824 * handling exceptions and the MMU hash table for us.
2827 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2829 unsigned long r6, unsigned long r7,
2830 unsigned long kbase)
2835 unsigned long offset = reloc_offset();
2842 * First zero the BSS
2844 memset(&__bss_start, 0, __bss_stop - __bss_start);
2847 * Init interface to Open Firmware, get some node references,
2850 prom_init_client_services(pp);
2853 * See if this OF is old enough that we need to do explicit maps
2854 * and other workarounds
2859 * Init prom stdout device
2863 prom_printf("Preparing to boot %s", linux_banner);
2866 * Get default machine type. At this point, we do not differentiate
2867 * between pSeries SMP and pSeries LPAR
2869 of_platform = prom_find_machine_type();
2870 prom_printf("Detected machine type: %x\n", of_platform);
2872 #ifndef CONFIG_NONSTATIC_KERNEL
2873 /* Bail if this is a kdump kernel. */
2874 if (PHYSICAL_START > 0)
2875 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2879 * Check for an initrd
2881 prom_check_initrd(r3, r4);
2883 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2885 * On pSeries, inform the firmware about our capabilities
2887 if (of_platform == PLATFORM_PSERIES ||
2888 of_platform == PLATFORM_PSERIES_LPAR)
2889 prom_send_capabilities();
2893 * Copy the CPU hold code
2895 if (of_platform != PLATFORM_POWERMAC)
2896 copy_and_flush(0, kbase, 0x100, 0);
2899 * Do early parsing of command line
2901 early_cmdline_parse();
2904 * Initialize memory management within prom_init
2909 * Determine which cpu is actually running right _now_
2911 prom_find_boot_cpu();
2914 * Initialize display devices
2916 prom_check_displays();
2920 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2921 * that uses the allocator, we need to make sure we get the top of memory
2922 * available for us here...
2924 if (of_platform == PLATFORM_PSERIES)
2925 prom_initialize_tce_table();
2929 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2930 * have a usable RTAS implementation.
2932 if (of_platform != PLATFORM_POWERMAC &&
2933 of_platform != PLATFORM_OPAL)
2934 prom_instantiate_rtas();
2936 #ifdef CONFIG_PPC_POWERNV
2937 /* Detect HAL and try instanciating it & doing takeover */
2938 if (of_platform == PLATFORM_PSERIES_LPAR) {
2940 if (of_platform == PLATFORM_OPAL) {
2941 prom_opal_hold_cpus();
2942 prom_opal_takeover();
2944 } else if (of_platform == PLATFORM_OPAL)
2945 prom_instantiate_opal();
2949 /* instantiate sml */
2950 prom_instantiate_sml();
2954 * On non-powermacs, put all CPUs in spin-loops.
2956 * PowerMacs use a different mechanism to spin CPUs
2958 if (of_platform != PLATFORM_POWERMAC &&
2959 of_platform != PLATFORM_OPAL)
2963 * Fill in some infos for use by the kernel later on
2965 if (prom_memory_limit)
2966 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
2968 sizeof(prom_memory_limit));
2971 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
2974 if (prom_iommu_force_on)
2975 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
2978 if (prom_tce_alloc_start) {
2979 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
2980 &prom_tce_alloc_start,
2981 sizeof(prom_tce_alloc_start));
2982 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
2983 &prom_tce_alloc_end,
2984 sizeof(prom_tce_alloc_end));
2989 * Fixup any known bugs in the device-tree
2991 fixup_device_tree();
2994 * Now finally create the flattened device-tree
2996 prom_printf("copying OF device tree...\n");
2997 flatten_device_tree();
3000 * in case stdin is USB and still active on IBM machines...
3001 * Unfortunately quiesce crashes on some powermacs if we have
3002 * closed stdin already (in particular the powerbook 101). It
3003 * appears that the OPAL version of OFW doesn't like it either.
3005 if (of_platform != PLATFORM_POWERMAC &&
3006 of_platform != PLATFORM_OPAL)
3010 * Call OF "quiesce" method to shut down pending DMA's from
3013 prom_printf("Calling quiesce...\n");
3014 call_prom("quiesce", 0, 0);
3017 * And finally, call the kernel passing it the flattened device
3018 * tree and NULL as r5, thus triggering the new entry point which
3019 * is common to us and kexec
3021 hdr = dt_header_start;
3023 /* Don't print anything after quiesce under OPAL, it crashes OFW */
3024 if (of_platform != PLATFORM_OPAL) {
3025 prom_printf("returning from prom_init\n");
3026 prom_debug("->dt_header_start=0x%x\n", hdr);
3030 reloc_got2(-offset);
3035 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3036 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3037 __start(hdr, kbase, 0, 0, 0,
3038 prom_opal_base, prom_opal_entry);
3040 __start(hdr, kbase, 0, 0, 0, 0, 0);