2 * Procedures for interfacing to Open Firmware.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/proc_fs.h>
27 #include <linux/stringify.h>
28 #include <linux/delay.h>
29 #include <linux/initrd.h>
30 #include <linux/bitops.h>
34 #include <asm/processor.h>
38 #include <asm/system.h>
40 #include <asm/pgtable.h>
42 #include <asm/iommu.h>
43 #include <asm/btext.h>
44 #include <asm/sections.h>
45 #include <asm/machdep.h>
48 #include <linux/linux_logo.h>
51 * Properties whose value is longer than this get excluded from our
52 * copy of the device tree. This value does need to be big enough to
53 * ensure that we don't lose things like the interrupt-map property
54 * on a PCI-PCI bridge.
56 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
59 * Eventually bump that one up
61 #define DEVTREE_CHUNK_SIZE 0x100000
64 * This is the size of the local memory reserve map that gets copied
65 * into the boot params passed to the kernel. That size is totally
66 * flexible as the kernel just reads the list until it encounters an
67 * entry with size 0, so it can be changed without breaking binary
70 #define MEM_RESERVE_MAP_SIZE 8
73 * prom_init() is called very early on, before the kernel text
74 * and data have been mapped to KERNELBASE. At this point the code
75 * is running at whatever address it has been loaded at.
76 * On ppc32 we compile with -mrelocatable, which means that references
77 * to extern and static variables get relocated automatically.
78 * On ppc64 we have to relocate the references explicitly with
79 * RELOC. (Note that strings count as static variables.)
81 * Because OF may have mapped I/O devices into the area starting at
82 * KERNELBASE, particularly on CHRP machines, we can't safely call
83 * OF once the kernel has been mapped to KERNELBASE. Therefore all
84 * OF calls must be done within prom_init().
86 * ADDR is used in calls to call_prom. The 4th and following
87 * arguments to call_prom should be 32-bit values.
88 * On ppc64, 64 bit values are truncated to 32 bits (and
89 * fortunately don't get interpreted as two arguments).
92 #define RELOC(x) (*PTRRELOC(&(x)))
93 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
94 #define OF_WORKAROUNDS 0
97 #define ADDR(x) (u32) (x)
98 #define OF_WORKAROUNDS of_workarounds
102 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
103 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
105 #define PROM_BUG() do { \
106 prom_printf("kernel BUG at %s line 0x%x!\n", \
107 RELOC(__FILE__), __LINE__); \
108 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
112 #define prom_debug(x...) prom_printf(x)
114 #define prom_debug(x...)
118 typedef u32 prom_arg_t;
136 struct mem_map_entry {
143 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
144 unsigned long r6, unsigned long r7, unsigned long r8,
148 extern int enter_prom(struct prom_args *args, unsigned long entry);
150 static inline int enter_prom(struct prom_args *args, unsigned long entry)
152 return ((int (*)(struct prom_args *))entry)(args);
156 extern void copy_and_flush(unsigned long dest, unsigned long src,
157 unsigned long size, unsigned long offset);
160 static struct prom_t __initdata prom;
162 static unsigned long prom_entry __initdata;
164 #define PROM_SCRATCH_SIZE 256
166 static char __initdata of_stdout_device[256];
167 static char __initdata prom_scratch[PROM_SCRATCH_SIZE];
169 static unsigned long __initdata dt_header_start;
170 static unsigned long __initdata dt_struct_start, dt_struct_end;
171 static unsigned long __initdata dt_string_start, dt_string_end;
173 static unsigned long __initdata prom_initrd_start, prom_initrd_end;
176 static int __initdata prom_iommu_force_on;
177 static int __initdata prom_iommu_off;
178 static unsigned long __initdata prom_tce_alloc_start;
179 static unsigned long __initdata prom_tce_alloc_end;
182 /* Platforms codes are now obsolete in the kernel. Now only used within this
183 * file and ultimately gone too. Feel free to change them if you need, they
184 * are not shared with anything outside of this file anymore
186 #define PLATFORM_PSERIES 0x0100
187 #define PLATFORM_PSERIES_LPAR 0x0101
188 #define PLATFORM_LPAR 0x0001
189 #define PLATFORM_POWERMAC 0x0400
190 #define PLATFORM_GENERIC 0x0500
191 #define PLATFORM_OPAL 0x0600
193 static int __initdata of_platform;
195 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE];
197 static unsigned long __initdata prom_memory_limit;
199 static unsigned long __initdata alloc_top;
200 static unsigned long __initdata alloc_top_high;
201 static unsigned long __initdata alloc_bottom;
202 static unsigned long __initdata rmo_top;
203 static unsigned long __initdata ram_top;
205 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE];
206 static int __initdata mem_reserve_cnt;
208 static cell_t __initdata regbuf[1024];
212 * Error results ... some OF calls will return "-1" on error, some
213 * will return 0, some will return either. To simplify, here are
214 * macros to use with any ihandle or phandle return value to check if
218 #define PROM_ERROR (-1u)
219 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
220 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
223 /* This is the one and *ONLY* place where we actually call open
227 static int __init call_prom(const char *service, int nargs, int nret, ...)
230 struct prom_args args;
233 args.service = ADDR(service);
237 va_start(list, nret);
238 for (i = 0; i < nargs; i++)
239 args.args[i] = va_arg(list, prom_arg_t);
242 for (i = 0; i < nret; i++)
243 args.args[nargs+i] = 0;
245 if (enter_prom(&args, RELOC(prom_entry)) < 0)
248 return (nret > 0) ? args.args[nargs] : 0;
251 static int __init call_prom_ret(const char *service, int nargs, int nret,
252 prom_arg_t *rets, ...)
255 struct prom_args args;
258 args.service = ADDR(service);
262 va_start(list, rets);
263 for (i = 0; i < nargs; i++)
264 args.args[i] = va_arg(list, prom_arg_t);
267 for (i = 0; i < nret; i++)
268 args.args[nargs+i] = 0;
270 if (enter_prom(&args, RELOC(prom_entry)) < 0)
274 for (i = 1; i < nret; ++i)
275 rets[i-1] = args.args[nargs+i];
277 return (nret > 0) ? args.args[nargs] : 0;
281 static void __init prom_print(const char *msg)
284 struct prom_t *_prom = &RELOC(prom);
286 if (_prom->stdout == 0)
289 for (p = msg; *p != 0; p = q) {
290 for (q = p; *q != 0 && *q != '\n'; ++q)
293 call_prom("write", 3, 1, _prom->stdout, p, q - p);
297 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2);
302 static void __init prom_print_hex(unsigned long val)
304 int i, nibbles = sizeof(val)*2;
305 char buf[sizeof(val)*2+1];
306 struct prom_t *_prom = &RELOC(prom);
308 for (i = nibbles-1; i >= 0; i--) {
309 buf[i] = (val & 0xf) + '0';
311 buf[i] += ('a'-'0'-10);
315 call_prom("write", 3, 1, _prom->stdout, buf, nibbles);
318 /* max number of decimal digits in an unsigned long */
320 static void __init prom_print_dec(unsigned long val)
323 char buf[UL_DIGITS+1];
324 struct prom_t *_prom = &RELOC(prom);
326 for (i = UL_DIGITS-1; i >= 0; i--) {
327 buf[i] = (val % 10) + '0';
332 /* shift stuff down */
333 size = UL_DIGITS - i;
334 call_prom("write", 3, 1, _prom->stdout, buf+i, size);
337 static void __init prom_printf(const char *format, ...)
339 const char *p, *q, *s;
343 struct prom_t *_prom = &RELOC(prom);
345 va_start(args, format);
347 format = PTRRELOC(format);
349 for (p = format; *p != 0; p = q) {
350 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q)
353 call_prom("write", 3, 1, _prom->stdout, p, q - p);
358 call_prom("write", 3, 1, _prom->stdout,
368 s = va_arg(args, const char *);
373 v = va_arg(args, unsigned long);
378 vs = va_arg(args, int);
380 prom_print(RELOC("-"));
389 else if (*q == 'x') {
391 v = va_arg(args, unsigned long);
393 } else if (*q == 'u') { /* '%lu' */
395 v = va_arg(args, unsigned long);
397 } else if (*q == 'd') { /* %ld */
399 vs = va_arg(args, long);
401 prom_print(RELOC("-"));
412 static unsigned int __init prom_claim(unsigned long virt, unsigned long size,
415 struct prom_t *_prom = &RELOC(prom);
417 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) {
419 * Old OF requires we claim physical and virtual separately
420 * and then map explicitly (assuming virtual mode)
425 ret = call_prom_ret("call-method", 5, 2, &result,
426 ADDR("claim"), _prom->memory,
428 if (ret != 0 || result == -1)
430 ret = call_prom_ret("call-method", 5, 2, &result,
431 ADDR("claim"), _prom->mmumap,
434 call_prom("call-method", 4, 1, ADDR("release"),
435 _prom->memory, size, virt);
438 /* the 0x12 is M (coherence) + PP == read/write */
439 call_prom("call-method", 6, 1,
440 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt);
443 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size,
447 static void __init __attribute__((noreturn)) prom_panic(const char *reason)
450 reason = PTRRELOC(reason);
453 /* Do not call exit because it clears the screen on pmac
454 * it also causes some sort of double-fault on early pmacs */
455 if (RELOC(of_platform) == PLATFORM_POWERMAC)
458 /* ToDo: should put up an SRC here on p/iSeries */
459 call_prom("exit", 0, 0);
461 for (;;) /* should never get here */
466 static int __init prom_next_node(phandle *nodep)
470 if ((node = *nodep) != 0
471 && (*nodep = call_prom("child", 1, 1, node)) != 0)
473 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
476 if ((node = call_prom("parent", 1, 1, node)) == 0)
478 if ((*nodep = call_prom("peer", 1, 1, node)) != 0)
483 static int inline prom_getprop(phandle node, const char *pname,
484 void *value, size_t valuelen)
486 return call_prom("getprop", 4, 1, node, ADDR(pname),
487 (u32)(unsigned long) value, (u32) valuelen);
490 static int inline prom_getproplen(phandle node, const char *pname)
492 return call_prom("getproplen", 2, 1, node, ADDR(pname));
495 static void add_string(char **str, const char *q)
505 static char *tohex(unsigned int x)
507 static char digits[] = "0123456789abcdef";
508 static char result[9];
515 result[i] = digits[x & 0xf];
517 } while (x != 0 && i > 0);
521 static int __init prom_setprop(phandle node, const char *nodename,
522 const char *pname, void *value, size_t valuelen)
526 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL))
527 return call_prom("setprop", 4, 1, node, ADDR(pname),
528 (u32)(unsigned long) value, (u32) valuelen);
530 /* gah... setprop doesn't work on longtrail, have to use interpret */
532 add_string(&p, "dev");
533 add_string(&p, nodename);
534 add_string(&p, tohex((u32)(unsigned long) value));
535 add_string(&p, tohex(valuelen));
536 add_string(&p, tohex(ADDR(pname)));
537 add_string(&p, tohex(strlen(RELOC(pname))));
538 add_string(&p, "property");
540 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd);
543 /* We can't use the standard versions because of RELOC headaches. */
544 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
545 || ('a' <= (c) && (c) <= 'f') \
546 || ('A' <= (c) && (c) <= 'F'))
548 #define isdigit(c) ('0' <= (c) && (c) <= '9')
549 #define islower(c) ('a' <= (c) && (c) <= 'z')
550 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
552 unsigned long prom_strtoul(const char *cp, const char **endp)
554 unsigned long result = 0, base = 10, value;
559 if (toupper(*cp) == 'X') {
565 while (isxdigit(*cp) &&
566 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {
567 result = result * base + value;
577 unsigned long prom_memparse(const char *ptr, const char **retptr)
579 unsigned long ret = prom_strtoul(ptr, retptr);
583 * We can't use a switch here because GCC *may* generate a
584 * jump table which won't work, because we're not running at
585 * the address we're linked at.
587 if ('G' == **retptr || 'g' == **retptr)
590 if ('M' == **retptr || 'm' == **retptr)
593 if ('K' == **retptr || 'k' == **retptr)
605 * Early parsing of the command line passed to the kernel, used for
606 * "mem=x" and the options that affect the iommu
608 static void __init early_cmdline_parse(void)
610 struct prom_t *_prom = &RELOC(prom);
616 RELOC(prom_cmd_line[0]) = 0;
617 p = RELOC(prom_cmd_line);
618 if ((long)_prom->chosen > 0)
619 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1);
620 #ifdef CONFIG_CMDLINE
621 if (l <= 0 || p[0] == '\0') /* dbl check */
622 strlcpy(RELOC(prom_cmd_line),
623 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line));
624 #endif /* CONFIG_CMDLINE */
625 prom_printf("command line: %s\n", RELOC(prom_cmd_line));
628 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
630 prom_printf("iommu opt is: %s\n", opt);
632 while (*opt && *opt == ' ')
634 if (!strncmp(opt, RELOC("off"), 3))
635 RELOC(prom_iommu_off) = 1;
636 else if (!strncmp(opt, RELOC("force"), 5))
637 RELOC(prom_iommu_force_on) = 1;
640 opt = strstr(RELOC(prom_cmd_line), RELOC("mem="));
643 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt);
645 /* Align to 16 MB == size of ppc64 large page */
646 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000);
651 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
653 * There are two methods for telling firmware what our capabilities are.
654 * Newer machines have an "ibm,client-architecture-support" method on the
655 * root node. For older machines, we have to call the "process-elf-header"
656 * method in the /packages/elf-loader node, passing it a fake 32-bit
657 * ELF header containing a couple of PT_NOTE sections that contain
658 * structures that contain various information.
662 * New method - extensible architecture description vector.
664 * Because the description vector contains a mix of byte and word
665 * values, we declare it as an unsigned char array, and use this
666 * macro to put word values in.
668 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
669 ((x) >> 8) & 0xff, (x) & 0xff
671 /* Option vector bits - generic bits in byte 1 */
672 #define OV_IGNORE 0x80 /* ignore this vector */
673 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
675 /* Option vector 1: processor architectures supported */
676 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
677 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
678 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
679 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
680 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
681 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
682 #define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */
684 /* Option vector 2: Open Firmware options supported */
685 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
687 /* Option vector 3: processor options supported */
688 #define OV3_FP 0x80 /* floating point */
689 #define OV3_VMX 0x40 /* VMX/Altivec */
690 #define OV3_DFP 0x20 /* decimal FP */
692 /* Option vector 5: PAPR/OF options supported */
693 #define OV5_LPAR 0x80 /* logical partitioning supported */
694 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
695 /* ibm,dynamic-reconfiguration-memory property supported */
696 #define OV5_DRCONF_MEMORY 0x20
697 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
698 #define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */
699 /* PCIe/MSI support. Without MSI full PCIe is not supported */
700 #ifdef CONFIG_PCI_MSI
701 #define OV5_MSI 0x01 /* PCIe/MSI support */
704 #endif /* CONFIG_PCI_MSI */
705 #ifdef CONFIG_PPC_SMLPAR
706 #define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */
707 #define OV5_XCMO 0x40 /* Page Coalescing */
710 #define OV5_XCMO 0x00
712 #define OV5_TYPE1_AFFINITY 0x80 /* Type 1 NUMA affinity */
714 /* Option Vector 6: IBM PAPR hints */
715 #define OV6_LINUX 0x02 /* Linux is our OS */
718 * The architecture vector has an array of PVR mask/value pairs,
719 * followed by # option vectors - 1, followed by the option vectors.
721 static unsigned char ibm_architecture_vec[] = {
722 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
723 W(0xffff0000), W(0x003e0000), /* POWER6 */
724 W(0xffff0000), W(0x003f0000), /* POWER7 */
725 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
726 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
727 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
728 6 - 1, /* 6 option vectors */
730 /* option vector 1: processor architectures supported */
732 0, /* don't ignore, don't halt */
733 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
734 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06,
736 /* option vector 2: Open Firmware options supported */
740 W(0xffffffff), /* real_base */
741 W(0xffffffff), /* real_size */
742 W(0xffffffff), /* virt_base */
743 W(0xffffffff), /* virt_size */
744 W(0xffffffff), /* load_base */
745 W(64), /* 64MB min RMA */
746 W(0xffffffff), /* full client load */
747 0, /* min RMA percentage of total RAM */
748 48, /* max log_2(hash table size) */
750 /* option vector 3: processor options supported */
752 0, /* don't ignore, don't halt */
753 OV3_FP | OV3_VMX | OV3_DFP,
755 /* option vector 4: IBM PAPR implementation */
759 /* option vector 5: PAPR/OF options */
761 0, /* don't ignore, don't halt */
762 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY |
763 OV5_DONATE_DEDICATE_CPU | OV5_MSI,
770 /* WARNING: The offset of the "number of cores" field below
771 * must match by the macro below. Update the definition if
772 * the structure layout changes.
774 #define IBM_ARCH_VEC_NRCORES_OFFSET 100
775 W(NR_CPUS), /* number of cores supported */
777 /* option vector 6: IBM PAPR hints */
785 /* Old method - ELF header with PT_NOTE sections */
786 static struct fake_elf {
793 char name[8]; /* "PowerPC" */
807 char name[24]; /* "IBM,RPA-Client-Config" */
821 .e_ident = { 0x7f, 'E', 'L', 'F',
822 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
823 .e_type = ET_EXEC, /* yeah right */
825 .e_version = EV_CURRENT,
826 .e_phoff = offsetof(struct fake_elf, phdr),
827 .e_phentsize = sizeof(Elf32_Phdr),
833 .p_offset = offsetof(struct fake_elf, chrpnote),
834 .p_filesz = sizeof(struct chrpnote)
837 .p_offset = offsetof(struct fake_elf, rpanote),
838 .p_filesz = sizeof(struct rpanote)
842 .namesz = sizeof("PowerPC"),
843 .descsz = sizeof(struct chrpdesc),
847 .real_mode = ~0U, /* ~0 means "don't care" */
856 .namesz = sizeof("IBM,RPA-Client-Config"),
857 .descsz = sizeof(struct rpadesc),
859 .name = "IBM,RPA-Client-Config",
862 .min_rmo_size = 64, /* in megabytes */
863 .min_rmo_percent = 0,
864 .max_pft_size = 48, /* 2^48 bytes max PFT size */
872 static int __init prom_count_smt_threads(void)
878 /* Pick up th first CPU node we can find */
879 for (node = 0; prom_next_node(&node); ) {
881 prom_getprop(node, "device_type", type, sizeof(type));
883 if (strcmp(type, RELOC("cpu")))
886 * There is an entry for each smt thread, each entry being
887 * 4 bytes long. All cpus should have the same number of
888 * smt threads, so return after finding the first.
890 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
891 if (plen == PROM_ERROR)
894 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
897 if (plen < 1 || plen > 64) {
898 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
899 (unsigned long)plen);
904 prom_debug("No threads found, assuming 1 per core\n");
911 static void __init prom_send_capabilities(void)
913 ihandle elfloader, root;
917 root = call_prom("open", 1, 1, ADDR("/"));
919 /* We need to tell the FW about the number of cores we support.
921 * To do that, we count the number of threads on the first core
922 * (we assume this is the same for all cores) and use it to
925 cores = (u32 *)PTRRELOC(&ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET]);
926 if (*cores != NR_CPUS) {
927 prom_printf("WARNING ! "
928 "ibm_architecture_vec structure inconsistent: %lu!\n",
931 *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
932 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
936 /* try calling the ibm,client-architecture-support method */
937 prom_printf("Calling ibm,client-architecture-support...");
938 if (call_prom_ret("call-method", 3, 2, &ret,
939 ADDR("ibm,client-architecture-support"),
941 ADDR(ibm_architecture_vec)) == 0) {
942 /* the call exists... */
944 prom_printf("\nWARNING: ibm,client-architecture"
945 "-support call FAILED!\n");
946 call_prom("close", 1, 0, root);
947 prom_printf(" done\n");
950 call_prom("close", 1, 0, root);
951 prom_printf(" not implemented\n");
954 /* no ibm,client-architecture-support call, try the old way */
955 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
956 if (elfloader == 0) {
957 prom_printf("couldn't open /packages/elf-loader\n");
960 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
961 elfloader, ADDR(&fake_elf));
962 call_prom("close", 1, 0, elfloader);
967 * Memory allocation strategy... our layout is normally:
969 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
970 * rare cases, initrd might end up being before the kernel though.
971 * We assume this won't override the final kernel at 0, we have no
972 * provision to handle that in this version, but it should hopefully
975 * alloc_top is set to the top of RMO, eventually shrink down if the
978 * alloc_bottom is set to the top of kernel/initrd
980 * from there, allocations are done this way : rtas is allocated
981 * topmost, and the device-tree is allocated from the bottom. We try
982 * to grow the device-tree allocation as we progress. If we can't,
983 * then we fail, we don't currently have a facility to restart
984 * elsewhere, but that shouldn't be necessary.
986 * Note that calls to reserve_mem have to be done explicitly, memory
987 * allocated with either alloc_up or alloc_down isn't automatically
993 * Allocates memory in the RMO upward from the kernel/initrd
995 * When align is 0, this is a special case, it means to allocate in place
996 * at the current location of alloc_bottom or fail (that is basically
997 * extending the previous allocation). Used for the device-tree flattening
999 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
1001 unsigned long base = RELOC(alloc_bottom);
1002 unsigned long addr = 0;
1005 base = _ALIGN_UP(base, align);
1006 prom_debug("alloc_up(%x, %x)\n", size, align);
1007 if (RELOC(ram_top) == 0)
1008 prom_panic("alloc_up() called with mem not initialized\n");
1011 base = _ALIGN_UP(RELOC(alloc_bottom), align);
1013 base = RELOC(alloc_bottom);
1015 for(; (base + size) <= RELOC(alloc_top);
1016 base = _ALIGN_UP(base + 0x100000, align)) {
1017 prom_debug(" trying: 0x%x\n\r", base);
1018 addr = (unsigned long)prom_claim(base, size, 0);
1019 if (addr != PROM_ERROR && addr != 0)
1027 RELOC(alloc_bottom) = addr + size;
1029 prom_debug(" -> %x\n", addr);
1030 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1031 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
1032 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1033 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
1034 prom_debug(" ram_top : %x\n", RELOC(ram_top));
1040 * Allocates memory downward, either from top of RMO, or if highmem
1041 * is set, from the top of RAM. Note that this one doesn't handle
1042 * failures. It does claim memory if highmem is not set.
1044 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1047 unsigned long base, addr = 0;
1049 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1050 highmem ? RELOC("(high)") : RELOC("(low)"));
1051 if (RELOC(ram_top) == 0)
1052 prom_panic("alloc_down() called with mem not initialized\n");
1055 /* Carve out storage for the TCE table. */
1056 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align);
1057 if (addr <= RELOC(alloc_bottom))
1059 /* Will we bump into the RMO ? If yes, check out that we
1060 * didn't overlap existing allocations there, if we did,
1061 * we are dead, we must be the first in town !
1063 if (addr < RELOC(rmo_top)) {
1064 /* Good, we are first */
1065 if (RELOC(alloc_top) == RELOC(rmo_top))
1066 RELOC(alloc_top) = RELOC(rmo_top) = addr;
1070 RELOC(alloc_top_high) = addr;
1074 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align);
1075 for (; base > RELOC(alloc_bottom);
1076 base = _ALIGN_DOWN(base - 0x100000, align)) {
1077 prom_debug(" trying: 0x%x\n\r", base);
1078 addr = (unsigned long)prom_claim(base, size, 0);
1079 if (addr != PROM_ERROR && addr != 0)
1085 RELOC(alloc_top) = addr;
1088 prom_debug(" -> %x\n", addr);
1089 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1090 prom_debug(" alloc_top : %x\n", RELOC(alloc_top));
1091 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1092 prom_debug(" rmo_top : %x\n", RELOC(rmo_top));
1093 prom_debug(" ram_top : %x\n", RELOC(ram_top));
1099 * Parse a "reg" cell
1101 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1104 unsigned long r = 0;
1106 /* Ignore more than 2 cells */
1107 while (s > sizeof(unsigned long) / 4) {
1123 * Very dumb function for adding to the memory reserve list, but
1124 * we don't need anything smarter at this point
1126 * XXX Eventually check for collisions. They should NEVER happen.
1127 * If problems seem to show up, it would be a good start to track
1130 static void __init reserve_mem(u64 base, u64 size)
1132 u64 top = base + size;
1133 unsigned long cnt = RELOC(mem_reserve_cnt);
1138 /* We need to always keep one empty entry so that we
1139 * have our terminator with "size" set to 0 since we are
1140 * dumb and just copy this entire array to the boot params
1142 base = _ALIGN_DOWN(base, PAGE_SIZE);
1143 top = _ALIGN_UP(top, PAGE_SIZE);
1146 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1147 prom_panic("Memory reserve map exhausted !\n");
1148 RELOC(mem_reserve_map)[cnt].base = base;
1149 RELOC(mem_reserve_map)[cnt].size = size;
1150 RELOC(mem_reserve_cnt) = cnt + 1;
1154 * Initialize memory allocation mechanism, parse "memory" nodes and
1155 * obtain that way the top of memory and RMO to setup out local allocator
1157 static void __init prom_init_mem(void)
1160 char *path, type[64];
1163 struct prom_t *_prom = &RELOC(prom);
1167 * We iterate the memory nodes to find
1168 * 1) top of RMO (first node)
1172 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac));
1174 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc));
1175 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1176 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1178 prom_debug("scanning memory:\n");
1179 path = RELOC(prom_scratch);
1181 for (node = 0; prom_next_node(&node); ) {
1183 prom_getprop(node, "device_type", type, sizeof(type));
1187 * CHRP Longtrail machines have no device_type
1188 * on the memory node, so check the name instead...
1190 prom_getprop(node, "name", type, sizeof(type));
1192 if (strcmp(type, RELOC("memory")))
1195 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf));
1196 if (plen > sizeof(regbuf)) {
1197 prom_printf("memory node too large for buffer !\n");
1198 plen = sizeof(regbuf);
1201 endp = p + (plen / sizeof(cell_t));
1204 memset(path, 0, PROM_SCRATCH_SIZE);
1205 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1206 prom_debug(" node %s :\n", path);
1207 #endif /* DEBUG_PROM */
1209 while ((endp - p) >= (rac + rsc)) {
1210 unsigned long base, size;
1212 base = prom_next_cell(rac, &p);
1213 size = prom_next_cell(rsc, &p);
1217 prom_debug(" %x %x\n", base, size);
1218 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR))
1219 RELOC(rmo_top) = size;
1220 if ((base + size) > RELOC(ram_top))
1221 RELOC(ram_top) = base + size;
1225 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
1227 /* Check if we have an initrd after the kernel, if we do move our bottom
1230 if (RELOC(prom_initrd_start)) {
1231 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
1232 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
1236 * If prom_memory_limit is set we reduce the upper limits *except* for
1237 * alloc_top_high. This must be the real top of RAM so we can put
1241 RELOC(alloc_top_high) = RELOC(ram_top);
1243 if (RELOC(prom_memory_limit)) {
1244 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) {
1245 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1246 RELOC(prom_memory_limit));
1247 RELOC(prom_memory_limit) = 0;
1248 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) {
1249 prom_printf("Ignoring mem=%x >= ram_top.\n",
1250 RELOC(prom_memory_limit));
1251 RELOC(prom_memory_limit) = 0;
1253 RELOC(ram_top) = RELOC(prom_memory_limit);
1254 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit));
1259 * Setup our top alloc point, that is top of RMO or top of
1260 * segment 0 when running non-LPAR.
1261 * Some RS64 machines have buggy firmware where claims up at
1262 * 1GB fail. Cap at 768MB as a workaround.
1263 * Since 768MB is plenty of room, and we need to cap to something
1264 * reasonable on 32-bit, cap at 768MB on all machines.
1266 if (!RELOC(rmo_top))
1267 RELOC(rmo_top) = RELOC(ram_top);
1268 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
1269 RELOC(alloc_top) = RELOC(rmo_top);
1270 RELOC(alloc_top_high) = RELOC(ram_top);
1272 prom_printf("memory layout at init:\n");
1273 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));
1274 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom));
1275 prom_printf(" alloc_top : %x\n", RELOC(alloc_top));
1276 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high));
1277 prom_printf(" rmo_top : %x\n", RELOC(rmo_top));
1278 prom_printf(" ram_top : %x\n", RELOC(ram_top));
1281 static void __init prom_close_stdin(void)
1283 struct prom_t *_prom = &RELOC(prom);
1286 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0)
1287 call_prom("close", 1, 0, val);
1290 #ifdef CONFIG_PPC_POWERNV
1292 static u64 __initdata prom_opal_size;
1293 static u64 __initdata prom_opal_align;
1294 static int __initdata prom_rtas_start_cpu;
1295 static u64 __initdata prom_rtas_data;
1296 static u64 __initdata prom_rtas_entry;
1298 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1299 static u64 __initdata prom_opal_base;
1300 static u64 __initdata prom_opal_entry;
1303 /* XXX Don't change this structure without updating opal-takeover.S */
1304 static struct opal_secondary_data {
1307 struct opal_takeover_args args; /* 16 */
1308 } opal_secondary_data;
1310 extern char opal_secondary_entry;
1312 static void prom_query_opal(void)
1316 /* We must not query for OPAL presence on a machine that
1317 * supports TNK takeover (970 blades), as this uses the same
1318 * h-call with different arguments and will crash
1320 if (PHANDLE_VALID(call_prom("finddevice", 1, 1,
1321 ADDR("/tnk-memory-map")))) {
1322 prom_printf("TNK takeover detected, skipping OPAL check\n");
1326 prom_printf("Querying for OPAL presence... ");
1327 rc = opal_query_takeover(&RELOC(prom_opal_size),
1328 &RELOC(prom_opal_align));
1329 prom_debug("(rc = %ld) ", rc);
1331 prom_printf("not there.\n");
1334 RELOC(of_platform) = PLATFORM_OPAL;
1335 prom_printf(" there !\n");
1336 prom_debug(" opal_size = 0x%lx\n", RELOC(prom_opal_size));
1337 prom_debug(" opal_align = 0x%lx\n", RELOC(prom_opal_align));
1338 if (RELOC(prom_opal_align) < 0x10000)
1339 RELOC(prom_opal_align) = 0x10000;
1342 static int prom_rtas_call(int token, int nargs, int nret, int *outputs, ...)
1344 struct rtas_args rtas_args;
1348 rtas_args.token = token;
1349 rtas_args.nargs = nargs;
1350 rtas_args.nret = nret;
1351 rtas_args.rets = (rtas_arg_t *)&(rtas_args.args[nargs]);
1352 va_start(list, outputs);
1353 for (i = 0; i < nargs; ++i)
1354 rtas_args.args[i] = va_arg(list, rtas_arg_t);
1357 for (i = 0; i < nret; ++i)
1358 rtas_args.rets[i] = 0;
1360 opal_enter_rtas(&rtas_args, RELOC(prom_rtas_data),
1361 RELOC(prom_rtas_entry));
1363 if (nret > 1 && outputs != NULL)
1364 for (i = 0; i < nret-1; ++i)
1365 outputs[i] = rtas_args.rets[i+1];
1366 return (nret > 0)? rtas_args.rets[0]: 0;
1369 static void __init prom_opal_hold_cpus(void)
1371 int i, cnt, cpu, rc;
1376 struct prom_t *_prom = &RELOC(prom);
1377 void *entry = (unsigned long *)&RELOC(opal_secondary_entry);
1378 struct opal_secondary_data *data = &RELOC(opal_secondary_data);
1380 prom_debug("prom_opal_hold_cpus: start...\n");
1381 prom_debug(" - entry = 0x%x\n", entry);
1382 prom_debug(" - data = 0x%x\n", data);
1388 for (node = 0; prom_next_node(&node); ) {
1390 prom_getprop(node, "device_type", type, sizeof(type));
1391 if (strcmp(type, RELOC("cpu")) != 0)
1394 /* Skip non-configured cpus. */
1395 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1396 if (strcmp(type, RELOC("okay")) != 0)
1399 cnt = prom_getprop(node, "ibm,ppc-interrupt-server#s", servers,
1401 if (cnt == PROM_ERROR)
1404 for (i = 0; i < cnt; i++) {
1406 prom_debug("CPU %d ... ", cpu);
1407 if (cpu == _prom->cpu) {
1408 prom_debug("booted !\n");
1411 prom_debug("starting ... ");
1413 /* Init the acknowledge var which will be reset by
1414 * the secondary cpu when it awakens from its OF
1418 rc = prom_rtas_call(RELOC(prom_rtas_start_cpu), 3, 1,
1419 NULL, cpu, entry, data);
1420 prom_debug("rtas rc=%d ...", rc);
1422 for (j = 0; j < 100000000 && data->ack == -1; j++) {
1427 if (data->ack != -1)
1428 prom_debug("done, PIR=0x%x\n", data->ack);
1430 prom_debug("timeout !\n");
1433 prom_debug("prom_opal_hold_cpus: end...\n");
1436 static void prom_opal_takeover(void)
1438 struct opal_secondary_data *data = &RELOC(opal_secondary_data);
1439 struct opal_takeover_args *args = &data->args;
1440 u64 align = RELOC(prom_opal_align);
1441 u64 top_addr, opal_addr;
1443 args->k_image = (u64)RELOC(_stext);
1444 args->k_size = _end - _stext;
1446 args->k_entry2 = 0x60;
1448 top_addr = _ALIGN_UP(args->k_size, align);
1450 if (RELOC(prom_initrd_start) != 0) {
1451 args->rd_image = RELOC(prom_initrd_start);
1452 args->rd_size = RELOC(prom_initrd_end) - args->rd_image;
1453 args->rd_loc = top_addr;
1454 top_addr = _ALIGN_UP(args->rd_loc + args->rd_size, align);
1457 /* Pickup an address for the HAL. We want to go really high
1458 * up to avoid problem with future kexecs. On the other hand
1459 * we don't want to be all over the TCEs on P5IOC2 machines
1460 * which are going to be up there too. We assume the machine
1461 * has plenty of memory, and we ask for the HAL for now to
1462 * be just below the 1G point, or above the initrd
1464 opal_addr = _ALIGN_DOWN(0x40000000 - RELOC(prom_opal_size), align);
1465 if (opal_addr < top_addr)
1466 opal_addr = top_addr;
1467 args->hal_addr = opal_addr;
1469 /* Copy the command line to the kernel image */
1470 strlcpy(RELOC(boot_command_line), RELOC(prom_cmd_line),
1473 prom_debug(" k_image = 0x%lx\n", args->k_image);
1474 prom_debug(" k_size = 0x%lx\n", args->k_size);
1475 prom_debug(" k_entry = 0x%lx\n", args->k_entry);
1476 prom_debug(" k_entry2 = 0x%lx\n", args->k_entry2);
1477 prom_debug(" hal_addr = 0x%lx\n", args->hal_addr);
1478 prom_debug(" rd_image = 0x%lx\n", args->rd_image);
1479 prom_debug(" rd_size = 0x%lx\n", args->rd_size);
1480 prom_debug(" rd_loc = 0x%lx\n", args->rd_loc);
1481 prom_printf("Performing OPAL takeover,this can take a few minutes..\n");
1486 opal_do_takeover(args);
1490 * Allocate room for and instantiate OPAL
1492 static void __init prom_instantiate_opal(void)
1497 u64 size = 0, align = 0x10000;
1500 prom_debug("prom_instantiate_opal: start...\n");
1502 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1503 prom_debug("opal_node: %x\n", opal_node);
1504 if (!PHANDLE_VALID(opal_node))
1507 prom_getprop(opal_node, "opal-runtime-size", &size, sizeof(size));
1510 prom_getprop(opal_node, "opal-runtime-alignment", &align,
1513 base = alloc_down(size, align, 0);
1515 prom_printf("OPAL allocation failed !\n");
1519 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1520 if (!IHANDLE_VALID(opal_inst)) {
1521 prom_printf("opening opal package failed (%x)\n", opal_inst);
1525 prom_printf("instantiating opal at 0x%x...", base);
1527 if (call_prom_ret("call-method", 4, 3, rets,
1528 ADDR("load-opal-runtime"),
1530 base >> 32, base & 0xffffffff) != 0
1531 || (rets[0] == 0 && rets[1] == 0)) {
1532 prom_printf(" failed\n");
1535 entry = (((u64)rets[0]) << 32) | rets[1];
1537 prom_printf(" done\n");
1539 reserve_mem(base, size);
1541 prom_debug("opal base = 0x%x\n", base);
1542 prom_debug("opal align = 0x%x\n", align);
1543 prom_debug("opal entry = 0x%x\n", entry);
1544 prom_debug("opal size = 0x%x\n", (long)size);
1546 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1547 &base, sizeof(base));
1548 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1549 &entry, sizeof(entry));
1551 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1552 RELOC(prom_opal_base) = base;
1553 RELOC(prom_opal_entry) = entry;
1555 prom_debug("prom_instantiate_opal: end...\n");
1558 #endif /* CONFIG_PPC_POWERNV */
1561 * Allocate room for and instantiate RTAS
1563 static void __init prom_instantiate_rtas(void)
1567 u32 base, entry = 0;
1570 prom_debug("prom_instantiate_rtas: start...\n");
1572 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1573 prom_debug("rtas_node: %x\n", rtas_node);
1574 if (!PHANDLE_VALID(rtas_node))
1577 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1581 base = alloc_down(size, PAGE_SIZE, 0);
1583 prom_printf("RTAS allocation failed !\n");
1587 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1588 if (!IHANDLE_VALID(rtas_inst)) {
1589 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1593 prom_printf("instantiating rtas at 0x%x...", base);
1595 if (call_prom_ret("call-method", 3, 2, &entry,
1596 ADDR("instantiate-rtas"),
1597 rtas_inst, base) != 0
1599 prom_printf(" failed\n");
1602 prom_printf(" done\n");
1604 reserve_mem(base, size);
1606 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1607 &base, sizeof(base));
1608 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1609 &entry, sizeof(entry));
1611 #ifdef CONFIG_PPC_POWERNV
1612 /* PowerVN takeover hack */
1613 RELOC(prom_rtas_data) = base;
1614 RELOC(prom_rtas_entry) = entry;
1615 prom_getprop(rtas_node, "start-cpu", &RELOC(prom_rtas_start_cpu), 4);
1617 prom_debug("rtas base = 0x%x\n", base);
1618 prom_debug("rtas entry = 0x%x\n", entry);
1619 prom_debug("rtas size = 0x%x\n", (long)size);
1621 prom_debug("prom_instantiate_rtas: end...\n");
1626 * Allocate room for and initialize TCE tables
1628 static void __init prom_initialize_tce_table(void)
1632 char compatible[64], type[64], model[64];
1633 char *path = RELOC(prom_scratch);
1635 u32 minalign, minsize;
1636 u64 tce_entry, *tce_entryp;
1637 u64 local_alloc_top, local_alloc_bottom;
1640 if (RELOC(prom_iommu_off))
1643 prom_debug("starting prom_initialize_tce_table\n");
1645 /* Cache current top of allocs so we reserve a single block */
1646 local_alloc_top = RELOC(alloc_top_high);
1647 local_alloc_bottom = local_alloc_top;
1649 /* Search all nodes looking for PHBs. */
1650 for (node = 0; prom_next_node(&node); ) {
1654 prom_getprop(node, "compatible",
1655 compatible, sizeof(compatible));
1656 prom_getprop(node, "device_type", type, sizeof(type));
1657 prom_getprop(node, "model", model, sizeof(model));
1659 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL))
1662 /* Keep the old logic intact to avoid regression. */
1663 if (compatible[0] != 0) {
1664 if ((strstr(compatible, RELOC("python")) == NULL) &&
1665 (strstr(compatible, RELOC("Speedwagon")) == NULL) &&
1666 (strstr(compatible, RELOC("Winnipeg")) == NULL))
1668 } else if (model[0] != 0) {
1669 if ((strstr(model, RELOC("ython")) == NULL) &&
1670 (strstr(model, RELOC("peedwagon")) == NULL) &&
1671 (strstr(model, RELOC("innipeg")) == NULL))
1675 if (prom_getprop(node, "tce-table-minalign", &minalign,
1676 sizeof(minalign)) == PROM_ERROR)
1678 if (prom_getprop(node, "tce-table-minsize", &minsize,
1679 sizeof(minsize)) == PROM_ERROR)
1680 minsize = 4UL << 20;
1683 * Even though we read what OF wants, we just set the table
1684 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1685 * By doing this, we avoid the pitfalls of trying to DMA to
1686 * MMIO space and the DMA alias hole.
1688 * On POWER4, firmware sets the TCE region by assuming
1689 * each TCE table is 8MB. Using this memory for anything
1690 * else will impact performance, so we always allocate 8MB.
1693 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p))
1694 minsize = 8UL << 20;
1696 minsize = 4UL << 20;
1698 /* Align to the greater of the align or size */
1699 align = max(minalign, minsize);
1700 base = alloc_down(minsize, align, 1);
1702 prom_panic("ERROR, cannot find space for TCE table.\n");
1703 if (base < local_alloc_bottom)
1704 local_alloc_bottom = base;
1706 /* It seems OF doesn't null-terminate the path :-( */
1707 memset(path, 0, PROM_SCRATCH_SIZE);
1708 /* Call OF to setup the TCE hardware */
1709 if (call_prom("package-to-path", 3, 1, node,
1710 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1711 prom_printf("package-to-path failed\n");
1714 /* Save away the TCE table attributes for later use. */
1715 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1716 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1718 prom_debug("TCE table: %s\n", path);
1719 prom_debug("\tnode = 0x%x\n", node);
1720 prom_debug("\tbase = 0x%x\n", base);
1721 prom_debug("\tsize = 0x%x\n", minsize);
1723 /* Initialize the table to have a one-to-one mapping
1724 * over the allocated size.
1726 tce_entryp = (u64 *)base;
1727 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1728 tce_entry = (i << PAGE_SHIFT);
1730 *tce_entryp = tce_entry;
1733 prom_printf("opening PHB %s", path);
1734 phb_node = call_prom("open", 1, 1, path);
1736 prom_printf("... failed\n");
1738 prom_printf("... done\n");
1740 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1741 phb_node, -1, minsize,
1742 (u32) base, (u32) (base >> 32));
1743 call_prom("close", 1, 0, phb_node);
1746 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1748 /* These are only really needed if there is a memory limit in
1749 * effect, but we don't know so export them always. */
1750 RELOC(prom_tce_alloc_start) = local_alloc_bottom;
1751 RELOC(prom_tce_alloc_end) = local_alloc_top;
1753 /* Flag the first invalid entry */
1754 prom_debug("ending prom_initialize_tce_table\n");
1759 * With CHRP SMP we need to use the OF to start the other processors.
1760 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1761 * so we have to put the processors into a holding pattern controlled
1762 * by the kernel (not OF) before we destroy the OF.
1764 * This uses a chunk of low memory, puts some holding pattern
1765 * code there and sends the other processors off to there until
1766 * smp_boot_cpus tells them to do something. The holding pattern
1767 * checks that address until its cpu # is there, when it is that
1768 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1769 * of setting those values.
1771 * We also use physical address 0x4 here to tell when a cpu
1772 * is in its holding pattern code.
1777 * We want to reference the copy of __secondary_hold_* in the
1778 * 0 - 0x100 address range
1780 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1782 static void __init prom_hold_cpus(void)
1788 struct prom_t *_prom = &RELOC(prom);
1789 unsigned long *spinloop
1790 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1791 unsigned long *acknowledge
1792 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1793 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1795 prom_debug("prom_hold_cpus: start...\n");
1796 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1797 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1798 prom_debug(" 1) acknowledge = 0x%x\n",
1799 (unsigned long)acknowledge);
1800 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1801 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1803 /* Set the common spinloop variable, so all of the secondary cpus
1804 * will block when they are awakened from their OF spinloop.
1805 * This must occur for both SMP and non SMP kernels, since OF will
1806 * be trashed when we move the kernel.
1811 for (node = 0; prom_next_node(&node); ) {
1813 prom_getprop(node, "device_type", type, sizeof(type));
1814 if (strcmp(type, RELOC("cpu")) != 0)
1817 /* Skip non-configured cpus. */
1818 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1819 if (strcmp(type, RELOC("okay")) != 0)
1823 prom_getprop(node, "reg", ®, sizeof(reg));
1825 prom_debug("cpu hw idx = %lu\n", reg);
1827 /* Init the acknowledge var which will be reset by
1828 * the secondary cpu when it awakens from its OF
1831 *acknowledge = (unsigned long)-1;
1833 if (reg != _prom->cpu) {
1834 /* Primary Thread of non-boot cpu or any thread */
1835 prom_printf("starting cpu hw idx %lu... ", reg);
1836 call_prom("start-cpu", 3, 0, node,
1837 secondary_hold, reg);
1839 for (i = 0; (i < 100000000) &&
1840 (*acknowledge == ((unsigned long)-1)); i++ )
1843 if (*acknowledge == reg)
1844 prom_printf("done\n");
1846 prom_printf("failed: %x\n", *acknowledge);
1850 prom_printf("boot cpu hw idx %lu\n", reg);
1851 #endif /* CONFIG_SMP */
1854 prom_debug("prom_hold_cpus: end...\n");
1858 static void __init prom_init_client_services(unsigned long pp)
1860 struct prom_t *_prom = &RELOC(prom);
1862 /* Get a handle to the prom entry point before anything else */
1863 RELOC(prom_entry) = pp;
1865 /* get a handle for the stdout device */
1866 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1867 if (!PHANDLE_VALID(_prom->chosen))
1868 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1870 /* get device tree root */
1871 _prom->root = call_prom("finddevice", 1, 1, ADDR("/"));
1872 if (!PHANDLE_VALID(_prom->root))
1873 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1880 * For really old powermacs, we need to map things we claim.
1881 * For that, we need the ihandle of the mmu.
1882 * Also, on the longtrail, we need to work around other bugs.
1884 static void __init prom_find_mmu(void)
1886 struct prom_t *_prom = &RELOC(prom);
1890 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1891 if (!PHANDLE_VALID(oprom))
1893 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1895 version[sizeof(version) - 1] = 0;
1896 /* XXX might need to add other versions here */
1897 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1898 of_workarounds = OF_WA_CLAIM;
1899 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1900 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1901 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1904 _prom->memory = call_prom("open", 1, 1, ADDR("/memory"));
1905 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap,
1906 sizeof(_prom->mmumap));
1907 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap))
1908 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1911 #define prom_find_mmu()
1914 static void __init prom_init_stdout(void)
1916 struct prom_t *_prom = &RELOC(prom);
1917 char *path = RELOC(of_stdout_device);
1921 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0)
1922 prom_panic("cannot find stdout");
1924 _prom->stdout = val;
1926 /* Get the full OF pathname of the stdout device */
1927 memset(path, 0, 256);
1928 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255);
1929 val = call_prom("instance-to-package", 1, 1, _prom->stdout);
1930 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package",
1932 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device));
1933 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path",
1934 path, strlen(path) + 1);
1936 /* If it's a display, note it */
1937 memset(type, 0, sizeof(type));
1938 prom_getprop(val, "device_type", type, sizeof(type));
1939 if (strcmp(type, RELOC("display")) == 0)
1940 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1943 static int __init prom_find_machine_type(void)
1945 struct prom_t *_prom = &RELOC(prom);
1953 /* Look for a PowerMac or a Cell */
1954 len = prom_getprop(_prom->root, "compatible",
1955 compat, sizeof(compat)-1);
1959 char *p = &compat[i];
1963 if (strstr(p, RELOC("Power Macintosh")) ||
1964 strstr(p, RELOC("MacRISC")))
1965 return PLATFORM_POWERMAC;
1967 /* We must make sure we don't detect the IBM Cell
1968 * blades as pSeries due to some firmware issues,
1971 if (strstr(p, RELOC("IBM,CBEA")) ||
1972 strstr(p, RELOC("IBM,CPBW-1.0")))
1973 return PLATFORM_GENERIC;
1974 #endif /* CONFIG_PPC64 */
1979 /* Try to detect OPAL */
1980 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1981 return PLATFORM_OPAL;
1983 /* Try to figure out if it's an IBM pSeries or any other
1984 * PAPR compliant platform. We assume it is if :
1985 * - /device_type is "chrp" (please, do NOT use that for future
1989 len = prom_getprop(_prom->root, "device_type",
1990 compat, sizeof(compat)-1);
1992 return PLATFORM_GENERIC;
1993 if (strcmp(compat, RELOC("chrp")))
1994 return PLATFORM_GENERIC;
1996 /* Default to pSeries. We need to know if we are running LPAR */
1997 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1998 if (!PHANDLE_VALID(rtas))
1999 return PLATFORM_GENERIC;
2000 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2001 if (x != PROM_ERROR) {
2002 prom_debug("Hypertas detected, assuming LPAR !\n");
2003 return PLATFORM_PSERIES_LPAR;
2005 return PLATFORM_PSERIES;
2007 return PLATFORM_GENERIC;
2011 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2013 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2017 * If we have a display that we don't know how to drive,
2018 * we will want to try to execute OF's open method for it
2019 * later. However, OF will probably fall over if we do that
2020 * we've taken over the MMU.
2021 * So we check whether we will need to open the display,
2022 * and if so, open it now.
2024 static void __init prom_check_displays(void)
2026 char type[16], *path;
2031 static unsigned char default_colors[] = {
2049 const unsigned char *clut;
2051 prom_debug("Looking for displays\n");
2052 for (node = 0; prom_next_node(&node); ) {
2053 memset(type, 0, sizeof(type));
2054 prom_getprop(node, "device_type", type, sizeof(type));
2055 if (strcmp(type, RELOC("display")) != 0)
2058 /* It seems OF doesn't null-terminate the path :-( */
2059 path = RELOC(prom_scratch);
2060 memset(path, 0, PROM_SCRATCH_SIZE);
2063 * leave some room at the end of the path for appending extra
2066 if (call_prom("package-to-path", 3, 1, node, path,
2067 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
2069 prom_printf("found display : %s, opening... ", path);
2071 ih = call_prom("open", 1, 1, path);
2073 prom_printf("failed\n");
2078 prom_printf("done\n");
2079 prom_setprop(node, path, "linux,opened", NULL, 0);
2081 /* Setup a usable color table when the appropriate
2082 * method is available. Should update this to set-colors */
2083 clut = RELOC(default_colors);
2084 for (i = 0; i < 32; i++, clut += 3)
2085 if (prom_set_color(ih, i, clut[0], clut[1],
2089 #ifdef CONFIG_LOGO_LINUX_CLUT224
2090 clut = PTRRELOC(RELOC(logo_linux_clut224.clut));
2091 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3)
2092 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2095 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2100 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2101 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2102 unsigned long needed, unsigned long align)
2106 *mem_start = _ALIGN(*mem_start, align);
2107 while ((*mem_start + needed) > *mem_end) {
2108 unsigned long room, chunk;
2110 prom_debug("Chunk exhausted, claiming more at %x...\n",
2111 RELOC(alloc_bottom));
2112 room = RELOC(alloc_top) - RELOC(alloc_bottom);
2113 if (room > DEVTREE_CHUNK_SIZE)
2114 room = DEVTREE_CHUNK_SIZE;
2115 if (room < PAGE_SIZE)
2116 prom_panic("No memory for flatten_device_tree "
2118 chunk = alloc_up(room, 0);
2120 prom_panic("No memory for flatten_device_tree "
2121 "(claim failed)\n");
2122 *mem_end = chunk + room;
2125 ret = (void *)*mem_start;
2126 *mem_start += needed;
2131 #define dt_push_token(token, mem_start, mem_end) \
2132 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
2134 static unsigned long __init dt_find_string(char *str)
2138 s = os = (char *)RELOC(dt_string_start);
2140 while (s < (char *)RELOC(dt_string_end)) {
2141 if (strcmp(s, str) == 0)
2149 * The Open Firmware 1275 specification states properties must be 31 bytes or
2150 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2152 #define MAX_PROPERTY_NAME 64
2154 static void __init scan_dt_build_strings(phandle node,
2155 unsigned long *mem_start,
2156 unsigned long *mem_end)
2158 char *prev_name, *namep, *sstart;
2162 sstart = (char *)RELOC(dt_string_start);
2164 /* get and store all property names */
2165 prev_name = RELOC("");
2167 /* 64 is max len of name including nul. */
2168 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2169 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2170 /* No more nodes: unwind alloc */
2171 *mem_start = (unsigned long)namep;
2176 if (strcmp(namep, RELOC("name")) == 0) {
2177 *mem_start = (unsigned long)namep;
2178 prev_name = RELOC("name");
2181 /* get/create string entry */
2182 soff = dt_find_string(namep);
2184 *mem_start = (unsigned long)namep;
2185 namep = sstart + soff;
2187 /* Trim off some if we can */
2188 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2189 RELOC(dt_string_end) = *mem_start;
2194 /* do all our children */
2195 child = call_prom("child", 1, 1, node);
2196 while (child != 0) {
2197 scan_dt_build_strings(child, mem_start, mem_end);
2198 child = call_prom("peer", 1, 1, child);
2202 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2203 unsigned long *mem_end)
2206 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2208 unsigned char *valp;
2209 static char pname[MAX_PROPERTY_NAME];
2210 int l, room, has_phandle = 0;
2212 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2214 /* get the node's full name */
2215 namep = (char *)*mem_start;
2216 room = *mem_end - *mem_start;
2219 l = call_prom("package-to-path", 3, 1, node, namep, room);
2221 /* Didn't fit? Get more room. */
2223 if (l >= *mem_end - *mem_start)
2224 namep = make_room(mem_start, mem_end, l+1, 1);
2225 call_prom("package-to-path", 3, 1, node, namep, l);
2229 /* Fixup an Apple bug where they have bogus \0 chars in the
2230 * middle of the path in some properties, and extract
2231 * the unit name (everything after the last '/').
2233 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2240 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2243 /* get it again for debugging */
2244 path = RELOC(prom_scratch);
2245 memset(path, 0, PROM_SCRATCH_SIZE);
2246 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2248 /* get and store all properties */
2249 prev_name = RELOC("");
2250 sstart = (char *)RELOC(dt_string_start);
2252 if (call_prom("nextprop", 3, 1, node, prev_name,
2257 if (strcmp(RELOC(pname), RELOC("name")) == 0) {
2258 prev_name = RELOC("name");
2262 /* find string offset */
2263 soff = dt_find_string(RELOC(pname));
2265 prom_printf("WARNING: Can't find string index for"
2266 " <%s>, node %s\n", RELOC(pname), path);
2269 prev_name = sstart + soff;
2272 l = call_prom("getproplen", 2, 1, node, RELOC(pname));
2275 if (l == PROM_ERROR)
2277 if (l > MAX_PROPERTY_LENGTH) {
2278 prom_printf("WARNING: ignoring large property ");
2279 /* It seems OF doesn't null-terminate the path :-( */
2280 prom_printf("[%s] ", path);
2281 prom_printf("%s length 0x%x\n", RELOC(pname), l);
2285 /* push property head */
2286 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2287 dt_push_token(l, mem_start, mem_end);
2288 dt_push_token(soff, mem_start, mem_end);
2290 /* push property content */
2291 valp = make_room(mem_start, mem_end, l, 4);
2292 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l);
2293 *mem_start = _ALIGN(*mem_start, 4);
2295 if (!strcmp(RELOC(pname), RELOC("phandle")))
2299 /* Add a "linux,phandle" property if no "phandle" property already
2300 * existed (can happen with OPAL)
2303 soff = dt_find_string(RELOC("linux,phandle"));
2305 prom_printf("WARNING: Can't find string index for"
2306 " <linux-phandle> node %s\n", path);
2308 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2309 dt_push_token(4, mem_start, mem_end);
2310 dt_push_token(soff, mem_start, mem_end);
2311 valp = make_room(mem_start, mem_end, 4, 4);
2312 *(u32 *)valp = node;
2316 /* do all our children */
2317 child = call_prom("child", 1, 1, node);
2318 while (child != 0) {
2319 scan_dt_build_struct(child, mem_start, mem_end);
2320 child = call_prom("peer", 1, 1, child);
2323 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2326 static void __init flatten_device_tree(void)
2329 unsigned long mem_start, mem_end, room;
2330 struct boot_param_header *hdr;
2331 struct prom_t *_prom = &RELOC(prom);
2336 * Check how much room we have between alloc top & bottom (+/- a
2337 * few pages), crop to 1MB, as this is our "chunk" size
2339 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000;
2340 if (room > DEVTREE_CHUNK_SIZE)
2341 room = DEVTREE_CHUNK_SIZE;
2342 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom));
2344 /* Now try to claim that */
2345 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2347 prom_panic("Can't allocate initial device-tree chunk\n");
2348 mem_end = mem_start + room;
2350 /* Get root of tree */
2351 root = call_prom("peer", 1, 1, (phandle)0);
2352 if (root == (phandle)0)
2353 prom_panic ("couldn't get device tree root\n");
2355 /* Build header and make room for mem rsv map */
2356 mem_start = _ALIGN(mem_start, 4);
2357 hdr = make_room(&mem_start, &mem_end,
2358 sizeof(struct boot_param_header), 4);
2359 RELOC(dt_header_start) = (unsigned long)hdr;
2360 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2362 /* Start of strings */
2363 mem_start = PAGE_ALIGN(mem_start);
2364 RELOC(dt_string_start) = mem_start;
2365 mem_start += 4; /* hole */
2367 /* Add "linux,phandle" in there, we'll need it */
2368 namep = make_room(&mem_start, &mem_end, 16, 1);
2369 strcpy(namep, RELOC("linux,phandle"));
2370 mem_start = (unsigned long)namep + strlen(namep) + 1;
2372 /* Build string array */
2373 prom_printf("Building dt strings...\n");
2374 scan_dt_build_strings(root, &mem_start, &mem_end);
2375 RELOC(dt_string_end) = mem_start;
2377 /* Build structure */
2378 mem_start = PAGE_ALIGN(mem_start);
2379 RELOC(dt_struct_start) = mem_start;
2380 prom_printf("Building dt structure...\n");
2381 scan_dt_build_struct(root, &mem_start, &mem_end);
2382 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2383 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start);
2386 hdr->boot_cpuid_phys = _prom->cpu;
2387 hdr->magic = OF_DT_HEADER;
2388 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start);
2389 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start);
2390 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start);
2391 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start);
2392 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start);
2393 hdr->version = OF_DT_VERSION;
2394 /* Version 16 is not backward compatible */
2395 hdr->last_comp_version = 0x10;
2397 /* Copy the reserve map in */
2398 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map));
2403 prom_printf("reserved memory map:\n");
2404 for (i = 0; i < RELOC(mem_reserve_cnt); i++)
2405 prom_printf(" %x - %x\n",
2406 RELOC(mem_reserve_map)[i].base,
2407 RELOC(mem_reserve_map)[i].size);
2410 /* Bump mem_reserve_cnt to cause further reservations to fail
2411 * since it's too late.
2413 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE;
2415 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2416 RELOC(dt_string_start), RELOC(dt_string_end));
2417 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2418 RELOC(dt_struct_start), RELOC(dt_struct_end));
2422 #ifdef CONFIG_PPC_MAPLE
2423 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2424 * The values are bad, and it doesn't even have the right number of cells. */
2425 static void __init fixup_device_tree_maple(void)
2428 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2432 name = "/ht@0/isa@4";
2433 isa = call_prom("finddevice", 1, 1, ADDR(name));
2434 if (!PHANDLE_VALID(isa)) {
2435 name = "/ht@0/isa@6";
2436 isa = call_prom("finddevice", 1, 1, ADDR(name));
2437 rloc = 0x01003000; /* IO space; PCI device = 6 */
2439 if (!PHANDLE_VALID(isa))
2442 if (prom_getproplen(isa, "ranges") != 12)
2444 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2448 if (isa_ranges[0] != 0x1 ||
2449 isa_ranges[1] != 0xf4000000 ||
2450 isa_ranges[2] != 0x00010000)
2453 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2455 isa_ranges[0] = 0x1;
2456 isa_ranges[1] = 0x0;
2457 isa_ranges[2] = rloc;
2458 isa_ranges[3] = 0x0;
2459 isa_ranges[4] = 0x0;
2460 isa_ranges[5] = 0x00010000;
2461 prom_setprop(isa, name, "ranges",
2462 isa_ranges, sizeof(isa_ranges));
2465 #define CPC925_MC_START 0xf8000000
2466 #define CPC925_MC_LENGTH 0x1000000
2467 /* The values for memory-controller don't have right number of cells */
2468 static void __init fixup_device_tree_maple_memory_controller(void)
2472 char *name = "/hostbridge@f8000000";
2473 struct prom_t *_prom = &RELOC(prom);
2476 mc = call_prom("finddevice", 1, 1, ADDR(name));
2477 if (!PHANDLE_VALID(mc))
2480 if (prom_getproplen(mc, "reg") != 8)
2483 prom_getprop(_prom->root, "#address-cells", &ac, sizeof(ac));
2484 prom_getprop(_prom->root, "#size-cells", &sc, sizeof(sc));
2485 if ((ac != 2) || (sc != 2))
2488 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2491 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2494 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2497 mc_reg[1] = CPC925_MC_START;
2499 mc_reg[3] = CPC925_MC_LENGTH;
2500 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2503 #define fixup_device_tree_maple()
2504 #define fixup_device_tree_maple_memory_controller()
2507 #ifdef CONFIG_PPC_CHRP
2509 * Pegasos and BriQ lacks the "ranges" property in the isa node
2510 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2511 * Pegasos has the IDE configured in legacy mode, but advertised as native
2513 static void __init fixup_device_tree_chrp(void)
2517 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2521 name = "/pci@80000000/isa@c";
2522 ph = call_prom("finddevice", 1, 1, ADDR(name));
2523 if (!PHANDLE_VALID(ph)) {
2524 name = "/pci@ff500000/isa@6";
2525 ph = call_prom("finddevice", 1, 1, ADDR(name));
2526 rloc = 0x01003000; /* IO space; PCI device = 6 */
2528 if (PHANDLE_VALID(ph)) {
2529 rc = prom_getproplen(ph, "ranges");
2530 if (rc == 0 || rc == PROM_ERROR) {
2531 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2538 prop[5] = 0x00010000;
2539 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2543 name = "/pci@80000000/ide@C,1";
2544 ph = call_prom("finddevice", 1, 1, ADDR(name));
2545 if (PHANDLE_VALID(ph)) {
2546 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2549 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2550 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2551 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2552 if (rc == sizeof(u32)) {
2554 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2559 #define fixup_device_tree_chrp()
2562 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2563 static void __init fixup_device_tree_pmac(void)
2565 phandle u3, i2c, mpic;
2570 /* Some G5s have a missing interrupt definition, fix it up here */
2571 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2572 if (!PHANDLE_VALID(u3))
2574 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2575 if (!PHANDLE_VALID(i2c))
2577 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2578 if (!PHANDLE_VALID(mpic))
2581 /* check if proper rev of u3 */
2582 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2585 if (u3_rev < 0x35 || u3_rev > 0x39)
2587 /* does it need fixup ? */
2588 if (prom_getproplen(i2c, "interrupts") > 0)
2591 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2593 /* interrupt on this revision of u3 is number 0 and level */
2596 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2597 &interrupts, sizeof(interrupts));
2599 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2600 &parent, sizeof(parent));
2603 #define fixup_device_tree_pmac()
2606 #ifdef CONFIG_PPC_EFIKA
2608 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2609 * to talk to the phy. If the phy-handle property is missing, then this
2610 * function is called to add the appropriate nodes and link it to the
2613 static void __init fixup_device_tree_efika_add_phy(void)
2619 /* Check if /builtin/ethernet exists - bail if it doesn't */
2620 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2621 if (!PHANDLE_VALID(node))
2624 /* Check if the phy-handle property exists - bail if it does */
2625 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2630 * At this point the ethernet device doesn't have a phy described.
2631 * Now we need to add the missing phy node and linkage
2634 /* Check for an MDIO bus node - if missing then create one */
2635 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2636 if (!PHANDLE_VALID(node)) {
2637 prom_printf("Adding Ethernet MDIO node\n");
2638 call_prom("interpret", 1, 1,
2639 " s\" /builtin\" find-device"
2641 " 1 encode-int s\" #address-cells\" property"
2642 " 0 encode-int s\" #size-cells\" property"
2643 " s\" mdio\" device-name"
2644 " s\" fsl,mpc5200b-mdio\" encode-string"
2645 " s\" compatible\" property"
2646 " 0xf0003000 0x400 reg"
2648 " 0x5 encode-int encode+"
2649 " 0x3 encode-int encode+"
2650 " s\" interrupts\" property"
2654 /* Check for a PHY device node - if missing then create one and
2655 * give it's phandle to the ethernet node */
2656 node = call_prom("finddevice", 1, 1,
2657 ADDR("/builtin/mdio/ethernet-phy"));
2658 if (!PHANDLE_VALID(node)) {
2659 prom_printf("Adding Ethernet PHY node\n");
2660 call_prom("interpret", 1, 1,
2661 " s\" /builtin/mdio\" find-device"
2663 " s\" ethernet-phy\" device-name"
2664 " 0x10 encode-int s\" reg\" property"
2668 " s\" /builtin/ethernet\" find-device"
2670 " s\" phy-handle\" property"
2675 static void __init fixup_device_tree_efika(void)
2677 int sound_irq[3] = { 2, 2, 0 };
2678 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2679 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2680 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2681 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2686 /* Check if we're really running on a EFIKA */
2687 node = call_prom("finddevice", 1, 1, ADDR("/"));
2688 if (!PHANDLE_VALID(node))
2691 rv = prom_getprop(node, "model", prop, sizeof(prop));
2692 if (rv == PROM_ERROR)
2694 if (strcmp(prop, "EFIKA5K2"))
2697 prom_printf("Applying EFIKA device tree fixups\n");
2699 /* Claiming to be 'chrp' is death */
2700 node = call_prom("finddevice", 1, 1, ADDR("/"));
2701 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2702 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2703 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2705 /* CODEGEN,description is exposed in /proc/cpuinfo so
2707 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2708 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2709 prom_setprop(node, "/", "CODEGEN,description",
2710 "Efika 5200B PowerPC System",
2711 sizeof("Efika 5200B PowerPC System"));
2713 /* Fixup bestcomm interrupts property */
2714 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2715 if (PHANDLE_VALID(node)) {
2716 len = prom_getproplen(node, "interrupts");
2718 prom_printf("Fixing bestcomm interrupts property\n");
2719 prom_setprop(node, "/builtin/bestcom", "interrupts",
2720 bcomm_irq, sizeof(bcomm_irq));
2724 /* Fixup sound interrupts property */
2725 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2726 if (PHANDLE_VALID(node)) {
2727 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2728 if (rv == PROM_ERROR) {
2729 prom_printf("Adding sound interrupts property\n");
2730 prom_setprop(node, "/builtin/sound", "interrupts",
2731 sound_irq, sizeof(sound_irq));
2735 /* Make sure ethernet phy-handle property exists */
2736 fixup_device_tree_efika_add_phy();
2739 #define fixup_device_tree_efika()
2742 static void __init fixup_device_tree(void)
2744 fixup_device_tree_maple();
2745 fixup_device_tree_maple_memory_controller();
2746 fixup_device_tree_chrp();
2747 fixup_device_tree_pmac();
2748 fixup_device_tree_efika();
2751 static void __init prom_find_boot_cpu(void)
2753 struct prom_t *_prom = &RELOC(prom);
2759 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2762 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2764 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2765 _prom->cpu = getprop_rval;
2767 prom_debug("Booting CPU hw index = %lu\n", _prom->cpu);
2770 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2772 #ifdef CONFIG_BLK_DEV_INITRD
2773 struct prom_t *_prom = &RELOC(prom);
2775 if (r3 && r4 && r4 != 0xdeadbeef) {
2778 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3;
2779 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4;
2781 val = RELOC(prom_initrd_start);
2782 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start",
2784 val = RELOC(prom_initrd_end);
2785 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end",
2788 reserve_mem(RELOC(prom_initrd_start),
2789 RELOC(prom_initrd_end) - RELOC(prom_initrd_start));
2791 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start));
2792 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end));
2794 #endif /* CONFIG_BLK_DEV_INITRD */
2799 * We enter here early on, when the Open Firmware prom is still
2800 * handling exceptions and the MMU hash table for us.
2803 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2805 unsigned long r6, unsigned long r7,
2806 unsigned long kbase)
2808 struct prom_t *_prom;
2812 unsigned long offset = reloc_offset();
2816 _prom = &RELOC(prom);
2819 * First zero the BSS
2821 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start);
2824 * Init interface to Open Firmware, get some node references,
2827 prom_init_client_services(pp);
2830 * See if this OF is old enough that we need to do explicit maps
2831 * and other workarounds
2836 * Init prom stdout device
2840 prom_printf("Preparing to boot %s", RELOC(linux_banner));
2843 * Get default machine type. At this point, we do not differentiate
2844 * between pSeries SMP and pSeries LPAR
2846 RELOC(of_platform) = prom_find_machine_type();
2847 prom_printf("Detected machine type: %x\n", RELOC(of_platform));
2849 #ifndef CONFIG_RELOCATABLE
2850 /* Bail if this is a kdump kernel. */
2851 if (PHYSICAL_START > 0)
2852 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2856 * Check for an initrd
2858 prom_check_initrd(r3, r4);
2860 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2862 * On pSeries, inform the firmware about our capabilities
2864 if (RELOC(of_platform) == PLATFORM_PSERIES ||
2865 RELOC(of_platform) == PLATFORM_PSERIES_LPAR)
2866 prom_send_capabilities();
2870 * Copy the CPU hold code
2872 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2873 copy_and_flush(0, kbase, 0x100, 0);
2876 * Do early parsing of command line
2878 early_cmdline_parse();
2881 * Initialize memory management within prom_init
2886 * Determine which cpu is actually running right _now_
2888 prom_find_boot_cpu();
2891 * Initialize display devices
2893 prom_check_displays();
2897 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2898 * that uses the allocator, we need to make sure we get the top of memory
2899 * available for us here...
2901 if (RELOC(of_platform) == PLATFORM_PSERIES)
2902 prom_initialize_tce_table();
2906 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2907 * have a usable RTAS implementation.
2909 if (RELOC(of_platform) != PLATFORM_POWERMAC &&
2910 RELOC(of_platform) != PLATFORM_OPAL)
2911 prom_instantiate_rtas();
2913 #ifdef CONFIG_PPC_POWERNV
2914 /* Detect HAL and try instanciating it & doing takeover */
2915 if (RELOC(of_platform) == PLATFORM_PSERIES_LPAR) {
2917 if (RELOC(of_platform) == PLATFORM_OPAL) {
2918 prom_opal_hold_cpus();
2919 prom_opal_takeover();
2921 } else if (RELOC(of_platform) == PLATFORM_OPAL)
2922 prom_instantiate_opal();
2926 * On non-powermacs, put all CPUs in spin-loops.
2928 * PowerMacs use a different mechanism to spin CPUs
2930 if (RELOC(of_platform) != PLATFORM_POWERMAC &&
2931 RELOC(of_platform) != PLATFORM_OPAL)
2935 * Fill in some infos for use by the kernel later on
2937 if (RELOC(prom_memory_limit))
2938 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit",
2939 &RELOC(prom_memory_limit),
2940 sizeof(prom_memory_limit));
2942 if (RELOC(prom_iommu_off))
2943 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off",
2946 if (RELOC(prom_iommu_force_on))
2947 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on",
2950 if (RELOC(prom_tce_alloc_start)) {
2951 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start",
2952 &RELOC(prom_tce_alloc_start),
2953 sizeof(prom_tce_alloc_start));
2954 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end",
2955 &RELOC(prom_tce_alloc_end),
2956 sizeof(prom_tce_alloc_end));
2961 * Fixup any known bugs in the device-tree
2963 fixup_device_tree();
2966 * Now finally create the flattened device-tree
2968 prom_printf("copying OF device tree...\n");
2969 flatten_device_tree();
2972 * in case stdin is USB and still active on IBM machines...
2973 * Unfortunately quiesce crashes on some powermacs if we have
2974 * closed stdin already (in particular the powerbook 101).
2976 if (RELOC(of_platform) != PLATFORM_POWERMAC)
2980 * Call OF "quiesce" method to shut down pending DMA's from
2983 prom_printf("Calling quiesce...\n");
2984 call_prom("quiesce", 0, 0);
2987 * And finally, call the kernel passing it the flattened device
2988 * tree and NULL as r5, thus triggering the new entry point which
2989 * is common to us and kexec
2991 hdr = RELOC(dt_header_start);
2992 prom_printf("returning from prom_init\n");
2993 prom_debug("->dt_header_start=0x%x\n", hdr);
2996 reloc_got2(-offset);
2999 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3000 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3001 __start(hdr, kbase, 0, 0, 0,
3002 RELOC(prom_opal_base), RELOC(prom_opal_entry));
3004 __start(hdr, kbase, 0, 0, 0, 0, 0);