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 * There are two methods for telling firmware what our capabilities are.
631 * Newer machines have an "ibm,client-architecture-support" method on the
632 * root node. For older machines, we have to call the "process-elf-header"
633 * method in the /packages/elf-loader node, passing it a fake 32-bit
634 * ELF header containing a couple of PT_NOTE sections that contain
635 * structures that contain various information.
639 * New method - extensible architecture description vector.
641 * Because the description vector contains a mix of byte and word
642 * values, we declare it as an unsigned char array, and use this
643 * macro to put word values in.
645 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
646 ((x) >> 8) & 0xff, (x) & 0xff
648 /* Option vector bits - generic bits in byte 1 */
649 #define OV_IGNORE 0x80 /* ignore this vector */
650 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
652 /* Option vector 1: processor architectures supported */
653 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
654 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
655 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
656 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
657 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
658 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
659 #define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */
660 #define OV1_PPC_2_07 0x01 /* set if we support PowerPC 2.07 */
662 /* Option vector 2: Open Firmware options supported */
663 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
665 /* Option vector 3: processor options supported */
666 #define OV3_FP 0x80 /* floating point */
667 #define OV3_VMX 0x40 /* VMX/Altivec */
668 #define OV3_DFP 0x20 /* decimal FP */
670 /* Option vector 4: IBM PAPR implementation */
671 #define OV4_MIN_ENT_CAP 0x01 /* minimum VP entitled capacity */
673 /* Option vector 5: PAPR/OF options supported */
674 #define OV5_LPAR 0x80 /* logical partitioning supported */
675 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
676 /* ibm,dynamic-reconfiguration-memory property supported */
677 #define OV5_DRCONF_MEMORY 0x20
678 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
679 #define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */
680 /* PCIe/MSI support. Without MSI full PCIe is not supported */
681 #ifdef CONFIG_PCI_MSI
682 #define OV5_MSI 0x01 /* PCIe/MSI support */
685 #endif /* CONFIG_PCI_MSI */
686 #ifdef CONFIG_PPC_SMLPAR
687 #define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */
688 #define OV5_XCMO 0x40 /* Page Coalescing */
691 #define OV5_XCMO 0x00
693 #define OV5_TYPE1_AFFINITY 0x80 /* Type 1 NUMA affinity */
694 #define OV5_PFO_HW_RNG 0x80 /* PFO Random Number Generator */
695 #define OV5_PFO_HW_842 0x40 /* PFO Compression Accelerator */
696 #define OV5_PFO_HW_ENCR 0x20 /* PFO Encryption Accelerator */
697 #define OV5_SUB_PROCESSORS 0x01 /* 1,2,or 4 Sub-Processors supported */
699 /* Option Vector 6: IBM PAPR hints */
700 #define OV6_LINUX 0x02 /* Linux is our OS */
703 * The architecture vector has an array of PVR mask/value pairs,
704 * followed by # option vectors - 1, followed by the option vectors.
706 static unsigned char ibm_architecture_vec[] = {
707 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
708 W(0xffff0000), W(0x003e0000), /* POWER6 */
709 W(0xffff0000), W(0x003f0000), /* POWER7 */
710 W(0xffff0000), W(0x004b0000), /* POWER8 */
711 W(0xffffffff), W(0x0f000004), /* all 2.07-compliant */
712 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
713 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
714 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
715 6 - 1, /* 6 option vectors */
717 /* option vector 1: processor architectures supported */
719 0, /* don't ignore, don't halt */
720 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 |
721 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07,
723 /* option vector 2: Open Firmware options supported */
727 W(0xffffffff), /* real_base */
728 W(0xffffffff), /* real_size */
729 W(0xffffffff), /* virt_base */
730 W(0xffffffff), /* virt_size */
731 W(0xffffffff), /* load_base */
732 W(256), /* 256MB min RMA */
733 W(0xffffffff), /* full client load */
734 0, /* min RMA percentage of total RAM */
735 48, /* max log_2(hash table size) */
737 /* option vector 3: processor options supported */
739 0, /* don't ignore, don't halt */
740 OV3_FP | OV3_VMX | OV3_DFP,
742 /* option vector 4: IBM PAPR implementation */
745 OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */
747 /* option vector 5: PAPR/OF options */
749 0, /* don't ignore, don't halt */
750 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY |
751 OV5_DONATE_DEDICATE_CPU | OV5_MSI,
758 /* WARNING: The offset of the "number of cores" field below
759 * must match by the macro below. Update the definition if
760 * the structure layout changes.
762 #define IBM_ARCH_VEC_NRCORES_OFFSET 117
763 W(NR_CPUS), /* number of cores supported */
768 OV5_PFO_HW_RNG | OV5_PFO_HW_ENCR | OV5_PFO_HW_842,
770 /* option vector 6: IBM PAPR hints */
778 /* Old method - ELF header with PT_NOTE sections */
779 static struct fake_elf {
786 char name[8]; /* "PowerPC" */
800 char name[24]; /* "IBM,RPA-Client-Config" */
814 .e_ident = { 0x7f, 'E', 'L', 'F',
815 ELFCLASS32, ELFDATA2MSB, EV_CURRENT },
816 .e_type = ET_EXEC, /* yeah right */
818 .e_version = EV_CURRENT,
819 .e_phoff = offsetof(struct fake_elf, phdr),
820 .e_phentsize = sizeof(Elf32_Phdr),
826 .p_offset = offsetof(struct fake_elf, chrpnote),
827 .p_filesz = sizeof(struct chrpnote)
830 .p_offset = offsetof(struct fake_elf, rpanote),
831 .p_filesz = sizeof(struct rpanote)
835 .namesz = sizeof("PowerPC"),
836 .descsz = sizeof(struct chrpdesc),
840 .real_mode = ~0U, /* ~0 means "don't care" */
849 .namesz = sizeof("IBM,RPA-Client-Config"),
850 .descsz = sizeof(struct rpadesc),
852 .name = "IBM,RPA-Client-Config",
855 .min_rmo_size = 64, /* in megabytes */
856 .min_rmo_percent = 0,
857 .max_pft_size = 48, /* 2^48 bytes max PFT size */
865 static int __init prom_count_smt_threads(void)
871 /* Pick up th first CPU node we can find */
872 for (node = 0; prom_next_node(&node); ) {
874 prom_getprop(node, "device_type", type, sizeof(type));
876 if (strcmp(type, "cpu"))
879 * There is an entry for each smt thread, each entry being
880 * 4 bytes long. All cpus should have the same number of
881 * smt threads, so return after finding the first.
883 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");
884 if (plen == PROM_ERROR)
887 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen);
890 if (plen < 1 || plen > 64) {
891 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
892 (unsigned long)plen);
897 prom_debug("No threads found, assuming 1 per core\n");
904 static void __init prom_send_capabilities(void)
906 ihandle elfloader, root;
910 root = call_prom("open", 1, 1, ADDR("/"));
912 /* We need to tell the FW about the number of cores we support.
914 * To do that, we count the number of threads on the first core
915 * (we assume this is the same for all cores) and use it to
918 cores = (u32 *)&ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET];
919 if (*cores != NR_CPUS) {
920 prom_printf("WARNING ! "
921 "ibm_architecture_vec structure inconsistent: %lu!\n",
924 *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
925 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
929 /* try calling the ibm,client-architecture-support method */
930 prom_printf("Calling ibm,client-architecture-support...");
931 if (call_prom_ret("call-method", 3, 2, &ret,
932 ADDR("ibm,client-architecture-support"),
934 ADDR(ibm_architecture_vec)) == 0) {
935 /* the call exists... */
937 prom_printf("\nWARNING: ibm,client-architecture"
938 "-support call FAILED!\n");
939 call_prom("close", 1, 0, root);
940 prom_printf(" done\n");
943 call_prom("close", 1, 0, root);
944 prom_printf(" not implemented\n");
947 /* no ibm,client-architecture-support call, try the old way */
948 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
949 if (elfloader == 0) {
950 prom_printf("couldn't open /packages/elf-loader\n");
953 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
954 elfloader, ADDR(&fake_elf));
955 call_prom("close", 1, 0, elfloader);
960 * Memory allocation strategy... our layout is normally:
962 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
963 * rare cases, initrd might end up being before the kernel though.
964 * We assume this won't override the final kernel at 0, we have no
965 * provision to handle that in this version, but it should hopefully
968 * alloc_top is set to the top of RMO, eventually shrink down if the
971 * alloc_bottom is set to the top of kernel/initrd
973 * from there, allocations are done this way : rtas is allocated
974 * topmost, and the device-tree is allocated from the bottom. We try
975 * to grow the device-tree allocation as we progress. If we can't,
976 * then we fail, we don't currently have a facility to restart
977 * elsewhere, but that shouldn't be necessary.
979 * Note that calls to reserve_mem have to be done explicitly, memory
980 * allocated with either alloc_up or alloc_down isn't automatically
986 * Allocates memory in the RMO upward from the kernel/initrd
988 * When align is 0, this is a special case, it means to allocate in place
989 * at the current location of alloc_bottom or fail (that is basically
990 * extending the previous allocation). Used for the device-tree flattening
992 static unsigned long __init alloc_up(unsigned long size, unsigned long align)
994 unsigned long base = alloc_bottom;
995 unsigned long addr = 0;
998 base = _ALIGN_UP(base, align);
999 prom_debug("alloc_up(%x, %x)\n", size, align);
1001 prom_panic("alloc_up() called with mem not initialized\n");
1004 base = _ALIGN_UP(alloc_bottom, align);
1006 base = alloc_bottom;
1008 for(; (base + size) <= alloc_top;
1009 base = _ALIGN_UP(base + 0x100000, align)) {
1010 prom_debug(" trying: 0x%x\n\r", base);
1011 addr = (unsigned long)prom_claim(base, size, 0);
1012 if (addr != PROM_ERROR && addr != 0)
1020 alloc_bottom = addr + size;
1022 prom_debug(" -> %x\n", addr);
1023 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1024 prom_debug(" alloc_top : %x\n", alloc_top);
1025 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1026 prom_debug(" rmo_top : %x\n", rmo_top);
1027 prom_debug(" ram_top : %x\n", ram_top);
1033 * Allocates memory downward, either from top of RMO, or if highmem
1034 * is set, from the top of RAM. Note that this one doesn't handle
1035 * failures. It does claim memory if highmem is not set.
1037 static unsigned long __init alloc_down(unsigned long size, unsigned long align,
1040 unsigned long base, addr = 0;
1042 prom_debug("alloc_down(%x, %x, %s)\n", size, align,
1043 highmem ? "(high)" : "(low)");
1045 prom_panic("alloc_down() called with mem not initialized\n");
1048 /* Carve out storage for the TCE table. */
1049 addr = _ALIGN_DOWN(alloc_top_high - size, align);
1050 if (addr <= alloc_bottom)
1052 /* Will we bump into the RMO ? If yes, check out that we
1053 * didn't overlap existing allocations there, if we did,
1054 * we are dead, we must be the first in town !
1056 if (addr < rmo_top) {
1057 /* Good, we are first */
1058 if (alloc_top == rmo_top)
1059 alloc_top = rmo_top = addr;
1063 alloc_top_high = addr;
1067 base = _ALIGN_DOWN(alloc_top - size, align);
1068 for (; base > alloc_bottom;
1069 base = _ALIGN_DOWN(base - 0x100000, align)) {
1070 prom_debug(" trying: 0x%x\n\r", base);
1071 addr = (unsigned long)prom_claim(base, size, 0);
1072 if (addr != PROM_ERROR && addr != 0)
1081 prom_debug(" -> %x\n", addr);
1082 prom_debug(" alloc_bottom : %x\n", alloc_bottom);
1083 prom_debug(" alloc_top : %x\n", alloc_top);
1084 prom_debug(" alloc_top_hi : %x\n", alloc_top_high);
1085 prom_debug(" rmo_top : %x\n", rmo_top);
1086 prom_debug(" ram_top : %x\n", ram_top);
1092 * Parse a "reg" cell
1094 static unsigned long __init prom_next_cell(int s, cell_t **cellp)
1097 unsigned long r = 0;
1099 /* Ignore more than 2 cells */
1100 while (s > sizeof(unsigned long) / 4) {
1116 * Very dumb function for adding to the memory reserve list, but
1117 * we don't need anything smarter at this point
1119 * XXX Eventually check for collisions. They should NEVER happen.
1120 * If problems seem to show up, it would be a good start to track
1123 static void __init reserve_mem(u64 base, u64 size)
1125 u64 top = base + size;
1126 unsigned long cnt = mem_reserve_cnt;
1131 /* We need to always keep one empty entry so that we
1132 * have our terminator with "size" set to 0 since we are
1133 * dumb and just copy this entire array to the boot params
1135 base = _ALIGN_DOWN(base, PAGE_SIZE);
1136 top = _ALIGN_UP(top, PAGE_SIZE);
1139 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))
1140 prom_panic("Memory reserve map exhausted !\n");
1141 mem_reserve_map[cnt].base = base;
1142 mem_reserve_map[cnt].size = size;
1143 mem_reserve_cnt = cnt + 1;
1147 * Initialize memory allocation mechanism, parse "memory" nodes and
1148 * obtain that way the top of memory and RMO to setup out local allocator
1150 static void __init prom_init_mem(void)
1153 char *path, type[64];
1159 * We iterate the memory nodes to find
1160 * 1) top of RMO (first node)
1164 prom_getprop(prom.root, "#address-cells", &rac, sizeof(rac));
1166 prom_getprop(prom.root, "#size-cells", &rsc, sizeof(rsc));
1167 prom_debug("root_addr_cells: %x\n", (unsigned long) rac);
1168 prom_debug("root_size_cells: %x\n", (unsigned long) rsc);
1170 prom_debug("scanning memory:\n");
1171 path = prom_scratch;
1173 for (node = 0; prom_next_node(&node); ) {
1175 prom_getprop(node, "device_type", type, sizeof(type));
1179 * CHRP Longtrail machines have no device_type
1180 * on the memory node, so check the name instead...
1182 prom_getprop(node, "name", type, sizeof(type));
1184 if (strcmp(type, "memory"))
1187 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf));
1188 if (plen > sizeof(regbuf)) {
1189 prom_printf("memory node too large for buffer !\n");
1190 plen = sizeof(regbuf);
1193 endp = p + (plen / sizeof(cell_t));
1196 memset(path, 0, PROM_SCRATCH_SIZE);
1197 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
1198 prom_debug(" node %s :\n", path);
1199 #endif /* DEBUG_PROM */
1201 while ((endp - p) >= (rac + rsc)) {
1202 unsigned long base, size;
1204 base = prom_next_cell(rac, &p);
1205 size = prom_next_cell(rsc, &p);
1209 prom_debug(" %x %x\n", base, size);
1210 if (base == 0 && (of_platform & PLATFORM_LPAR))
1212 if ((base + size) > ram_top)
1213 ram_top = base + size;
1217 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000);
1220 * If prom_memory_limit is set we reduce the upper limits *except* for
1221 * alloc_top_high. This must be the real top of RAM so we can put
1225 alloc_top_high = ram_top;
1227 if (prom_memory_limit) {
1228 if (prom_memory_limit <= alloc_bottom) {
1229 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1231 prom_memory_limit = 0;
1232 } else if (prom_memory_limit >= ram_top) {
1233 prom_printf("Ignoring mem=%x >= ram_top.\n",
1235 prom_memory_limit = 0;
1237 ram_top = prom_memory_limit;
1238 rmo_top = min(rmo_top, prom_memory_limit);
1243 * Setup our top alloc point, that is top of RMO or top of
1244 * segment 0 when running non-LPAR.
1245 * Some RS64 machines have buggy firmware where claims up at
1246 * 1GB fail. Cap at 768MB as a workaround.
1247 * Since 768MB is plenty of room, and we need to cap to something
1248 * reasonable on 32-bit, cap at 768MB on all machines.
1252 rmo_top = min(0x30000000ul, rmo_top);
1253 alloc_top = rmo_top;
1254 alloc_top_high = ram_top;
1257 * Check if we have an initrd after the kernel but still inside
1258 * the RMO. If we do move our bottom point to after it.
1260 if (prom_initrd_start &&
1261 prom_initrd_start < rmo_top &&
1262 prom_initrd_end > alloc_bottom)
1263 alloc_bottom = PAGE_ALIGN(prom_initrd_end);
1265 prom_printf("memory layout at init:\n");
1266 prom_printf(" memory_limit : %x (16 MB aligned)\n", prom_memory_limit);
1267 prom_printf(" alloc_bottom : %x\n", alloc_bottom);
1268 prom_printf(" alloc_top : %x\n", alloc_top);
1269 prom_printf(" alloc_top_hi : %x\n", alloc_top_high);
1270 prom_printf(" rmo_top : %x\n", rmo_top);
1271 prom_printf(" ram_top : %x\n", ram_top);
1274 static void __init prom_close_stdin(void)
1278 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0)
1279 call_prom("close", 1, 0, val);
1282 #ifdef CONFIG_PPC_POWERNV
1284 static u64 __initdata prom_opal_size;
1285 static u64 __initdata prom_opal_align;
1286 static int __initdata prom_rtas_start_cpu;
1287 static u64 __initdata prom_rtas_data;
1288 static u64 __initdata prom_rtas_entry;
1290 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1291 static u64 __initdata prom_opal_base;
1292 static u64 __initdata prom_opal_entry;
1295 /* XXX Don't change this structure without updating opal-takeover.S */
1296 static struct opal_secondary_data {
1299 struct opal_takeover_args args; /* 16 */
1300 } opal_secondary_data;
1302 extern char opal_secondary_entry;
1304 static void __init prom_query_opal(void)
1308 /* We must not query for OPAL presence on a machine that
1309 * supports TNK takeover (970 blades), as this uses the same
1310 * h-call with different arguments and will crash
1312 if (PHANDLE_VALID(call_prom("finddevice", 1, 1,
1313 ADDR("/tnk-memory-map")))) {
1314 prom_printf("TNK takeover detected, skipping OPAL check\n");
1318 prom_printf("Querying for OPAL presence... ");
1319 rc = opal_query_takeover(&prom_opal_size,
1321 prom_debug("(rc = %ld) ", rc);
1323 prom_printf("not there.\n");
1326 of_platform = PLATFORM_OPAL;
1327 prom_printf(" there !\n");
1328 prom_debug(" opal_size = 0x%lx\n", prom_opal_size);
1329 prom_debug(" opal_align = 0x%lx\n", prom_opal_align);
1330 if (prom_opal_align < 0x10000)
1331 prom_opal_align = 0x10000;
1334 static int prom_rtas_call(int token, int nargs, int nret, int *outputs, ...)
1336 struct rtas_args rtas_args;
1340 rtas_args.token = token;
1341 rtas_args.nargs = nargs;
1342 rtas_args.nret = nret;
1343 rtas_args.rets = (rtas_arg_t *)&(rtas_args.args[nargs]);
1344 va_start(list, outputs);
1345 for (i = 0; i < nargs; ++i)
1346 rtas_args.args[i] = va_arg(list, rtas_arg_t);
1349 for (i = 0; i < nret; ++i)
1350 rtas_args.rets[i] = 0;
1352 opal_enter_rtas(&rtas_args, prom_rtas_data,
1355 if (nret > 1 && outputs != NULL)
1356 for (i = 0; i < nret-1; ++i)
1357 outputs[i] = rtas_args.rets[i+1];
1358 return (nret > 0)? rtas_args.rets[0]: 0;
1361 static void __init prom_opal_hold_cpus(void)
1363 int i, cnt, cpu, rc;
1368 void *entry = (unsigned long *)&opal_secondary_entry;
1369 struct opal_secondary_data *data = &opal_secondary_data;
1371 prom_debug("prom_opal_hold_cpus: start...\n");
1372 prom_debug(" - entry = 0x%x\n", entry);
1373 prom_debug(" - data = 0x%x\n", data);
1379 for (node = 0; prom_next_node(&node); ) {
1381 prom_getprop(node, "device_type", type, sizeof(type));
1382 if (strcmp(type, "cpu") != 0)
1385 /* Skip non-configured cpus. */
1386 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1387 if (strcmp(type, "okay") != 0)
1390 cnt = prom_getprop(node, "ibm,ppc-interrupt-server#s", servers,
1392 if (cnt == PROM_ERROR)
1395 for (i = 0; i < cnt; i++) {
1397 prom_debug("CPU %d ... ", cpu);
1398 if (cpu == prom.cpu) {
1399 prom_debug("booted !\n");
1402 prom_debug("starting ... ");
1404 /* Init the acknowledge var which will be reset by
1405 * the secondary cpu when it awakens from its OF
1409 rc = prom_rtas_call(prom_rtas_start_cpu, 3, 1,
1410 NULL, cpu, entry, data);
1411 prom_debug("rtas rc=%d ...", rc);
1413 for (j = 0; j < 100000000 && data->ack == -1; j++) {
1418 if (data->ack != -1)
1419 prom_debug("done, PIR=0x%x\n", data->ack);
1421 prom_debug("timeout !\n");
1424 prom_debug("prom_opal_hold_cpus: end...\n");
1427 static void __init prom_opal_takeover(void)
1429 struct opal_secondary_data *data = &opal_secondary_data;
1430 struct opal_takeover_args *args = &data->args;
1431 u64 align = prom_opal_align;
1432 u64 top_addr, opal_addr;
1434 args->k_image = (u64)_stext;
1435 args->k_size = _end - _stext;
1437 args->k_entry2 = 0x60;
1439 top_addr = _ALIGN_UP(args->k_size, align);
1441 if (prom_initrd_start != 0) {
1442 args->rd_image = prom_initrd_start;
1443 args->rd_size = prom_initrd_end - args->rd_image;
1444 args->rd_loc = top_addr;
1445 top_addr = _ALIGN_UP(args->rd_loc + args->rd_size, align);
1448 /* Pickup an address for the HAL. We want to go really high
1449 * up to avoid problem with future kexecs. On the other hand
1450 * we don't want to be all over the TCEs on P5IOC2 machines
1451 * which are going to be up there too. We assume the machine
1452 * has plenty of memory, and we ask for the HAL for now to
1453 * be just below the 1G point, or above the initrd
1455 opal_addr = _ALIGN_DOWN(0x40000000 - prom_opal_size, align);
1456 if (opal_addr < top_addr)
1457 opal_addr = top_addr;
1458 args->hal_addr = opal_addr;
1460 /* Copy the command line to the kernel image */
1461 strlcpy(boot_command_line, prom_cmd_line,
1464 prom_debug(" k_image = 0x%lx\n", args->k_image);
1465 prom_debug(" k_size = 0x%lx\n", args->k_size);
1466 prom_debug(" k_entry = 0x%lx\n", args->k_entry);
1467 prom_debug(" k_entry2 = 0x%lx\n", args->k_entry2);
1468 prom_debug(" hal_addr = 0x%lx\n", args->hal_addr);
1469 prom_debug(" rd_image = 0x%lx\n", args->rd_image);
1470 prom_debug(" rd_size = 0x%lx\n", args->rd_size);
1471 prom_debug(" rd_loc = 0x%lx\n", args->rd_loc);
1472 prom_printf("Performing OPAL takeover,this can take a few minutes..\n");
1477 opal_do_takeover(args);
1481 * Allocate room for and instantiate OPAL
1483 static void __init prom_instantiate_opal(void)
1488 u64 size = 0, align = 0x10000;
1491 prom_debug("prom_instantiate_opal: start...\n");
1493 opal_node = call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1494 prom_debug("opal_node: %x\n", opal_node);
1495 if (!PHANDLE_VALID(opal_node))
1498 prom_getprop(opal_node, "opal-runtime-size", &size, sizeof(size));
1501 prom_getprop(opal_node, "opal-runtime-alignment", &align,
1504 base = alloc_down(size, align, 0);
1506 prom_printf("OPAL allocation failed !\n");
1510 opal_inst = call_prom("open", 1, 1, ADDR("/ibm,opal"));
1511 if (!IHANDLE_VALID(opal_inst)) {
1512 prom_printf("opening opal package failed (%x)\n", opal_inst);
1516 prom_printf("instantiating opal at 0x%x...", base);
1518 if (call_prom_ret("call-method", 4, 3, rets,
1519 ADDR("load-opal-runtime"),
1521 base >> 32, base & 0xffffffff) != 0
1522 || (rets[0] == 0 && rets[1] == 0)) {
1523 prom_printf(" failed\n");
1526 entry = (((u64)rets[0]) << 32) | rets[1];
1528 prom_printf(" done\n");
1530 reserve_mem(base, size);
1532 prom_debug("opal base = 0x%x\n", base);
1533 prom_debug("opal align = 0x%x\n", align);
1534 prom_debug("opal entry = 0x%x\n", entry);
1535 prom_debug("opal size = 0x%x\n", (long)size);
1537 prom_setprop(opal_node, "/ibm,opal", "opal-base-address",
1538 &base, sizeof(base));
1539 prom_setprop(opal_node, "/ibm,opal", "opal-entry-address",
1540 &entry, sizeof(entry));
1542 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1543 prom_opal_base = base;
1544 prom_opal_entry = entry;
1546 prom_debug("prom_instantiate_opal: end...\n");
1549 #endif /* CONFIG_PPC_POWERNV */
1552 * Allocate room for and instantiate RTAS
1554 static void __init prom_instantiate_rtas(void)
1558 u32 base, entry = 0;
1561 prom_debug("prom_instantiate_rtas: start...\n");
1563 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));
1564 prom_debug("rtas_node: %x\n", rtas_node);
1565 if (!PHANDLE_VALID(rtas_node))
1568 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size));
1572 base = alloc_down(size, PAGE_SIZE, 0);
1574 prom_panic("Could not allocate memory for RTAS\n");
1576 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));
1577 if (!IHANDLE_VALID(rtas_inst)) {
1578 prom_printf("opening rtas package failed (%x)\n", rtas_inst);
1582 prom_printf("instantiating rtas at 0x%x...", base);
1584 if (call_prom_ret("call-method", 3, 2, &entry,
1585 ADDR("instantiate-rtas"),
1586 rtas_inst, base) != 0
1588 prom_printf(" failed\n");
1591 prom_printf(" done\n");
1593 reserve_mem(base, size);
1595 prom_setprop(rtas_node, "/rtas", "linux,rtas-base",
1596 &base, sizeof(base));
1597 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",
1598 &entry, sizeof(entry));
1600 #ifdef CONFIG_PPC_POWERNV
1601 /* PowerVN takeover hack */
1602 prom_rtas_data = base;
1603 prom_rtas_entry = entry;
1604 prom_getprop(rtas_node, "start-cpu", &prom_rtas_start_cpu, 4);
1606 prom_debug("rtas base = 0x%x\n", base);
1607 prom_debug("rtas entry = 0x%x\n", entry);
1608 prom_debug("rtas size = 0x%x\n", (long)size);
1610 prom_debug("prom_instantiate_rtas: end...\n");
1615 * Allocate room for and instantiate Stored Measurement Log (SML)
1617 static void __init prom_instantiate_sml(void)
1619 phandle ibmvtpm_node;
1620 ihandle ibmvtpm_inst;
1621 u32 entry = 0, size = 0;
1624 prom_debug("prom_instantiate_sml: start...\n");
1626 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/ibm,vtpm"));
1627 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node);
1628 if (!PHANDLE_VALID(ibmvtpm_node))
1631 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/ibm,vtpm"));
1632 if (!IHANDLE_VALID(ibmvtpm_inst)) {
1633 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst);
1637 if (call_prom_ret("call-method", 2, 2, &size,
1638 ADDR("sml-get-handover-size"),
1639 ibmvtpm_inst) != 0 || size == 0) {
1640 prom_printf("SML get handover size failed\n");
1644 base = alloc_down(size, PAGE_SIZE, 0);
1646 prom_panic("Could not allocate memory for sml\n");
1648 prom_printf("instantiating sml at 0x%x...", base);
1650 if (call_prom_ret("call-method", 4, 2, &entry,
1651 ADDR("sml-handover"),
1652 ibmvtpm_inst, size, base) != 0 || entry == 0) {
1653 prom_printf("SML handover failed\n");
1656 prom_printf(" done\n");
1658 reserve_mem(base, size);
1660 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-base",
1661 &base, sizeof(base));
1662 prom_setprop(ibmvtpm_node, "/ibm,vtpm", "linux,sml-size",
1663 &size, sizeof(size));
1665 prom_debug("sml base = 0x%x\n", base);
1666 prom_debug("sml size = 0x%x\n", (long)size);
1668 prom_debug("prom_instantiate_sml: end...\n");
1672 * Allocate room for and initialize TCE tables
1674 static void __init prom_initialize_tce_table(void)
1678 char compatible[64], type[64], model[64];
1679 char *path = prom_scratch;
1681 u32 minalign, minsize;
1682 u64 tce_entry, *tce_entryp;
1683 u64 local_alloc_top, local_alloc_bottom;
1689 prom_debug("starting prom_initialize_tce_table\n");
1691 /* Cache current top of allocs so we reserve a single block */
1692 local_alloc_top = alloc_top_high;
1693 local_alloc_bottom = local_alloc_top;
1695 /* Search all nodes looking for PHBs. */
1696 for (node = 0; prom_next_node(&node); ) {
1700 prom_getprop(node, "compatible",
1701 compatible, sizeof(compatible));
1702 prom_getprop(node, "device_type", type, sizeof(type));
1703 prom_getprop(node, "model", model, sizeof(model));
1705 if ((type[0] == 0) || (strstr(type, "pci") == NULL))
1708 /* Keep the old logic intact to avoid regression. */
1709 if (compatible[0] != 0) {
1710 if ((strstr(compatible, "python") == NULL) &&
1711 (strstr(compatible, "Speedwagon") == NULL) &&
1712 (strstr(compatible, "Winnipeg") == NULL))
1714 } else if (model[0] != 0) {
1715 if ((strstr(model, "ython") == NULL) &&
1716 (strstr(model, "peedwagon") == NULL) &&
1717 (strstr(model, "innipeg") == NULL))
1721 if (prom_getprop(node, "tce-table-minalign", &minalign,
1722 sizeof(minalign)) == PROM_ERROR)
1724 if (prom_getprop(node, "tce-table-minsize", &minsize,
1725 sizeof(minsize)) == PROM_ERROR)
1726 minsize = 4UL << 20;
1729 * Even though we read what OF wants, we just set the table
1730 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1731 * By doing this, we avoid the pitfalls of trying to DMA to
1732 * MMIO space and the DMA alias hole.
1734 * On POWER4, firmware sets the TCE region by assuming
1735 * each TCE table is 8MB. Using this memory for anything
1736 * else will impact performance, so we always allocate 8MB.
1739 if (pvr_version_is(PVR_POWER4) || pvr_version_is(PVR_POWER4p))
1740 minsize = 8UL << 20;
1742 minsize = 4UL << 20;
1744 /* Align to the greater of the align or size */
1745 align = max(minalign, minsize);
1746 base = alloc_down(minsize, align, 1);
1748 prom_panic("ERROR, cannot find space for TCE table.\n");
1749 if (base < local_alloc_bottom)
1750 local_alloc_bottom = base;
1752 /* It seems OF doesn't null-terminate the path :-( */
1753 memset(path, 0, PROM_SCRATCH_SIZE);
1754 /* Call OF to setup the TCE hardware */
1755 if (call_prom("package-to-path", 3, 1, node,
1756 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) {
1757 prom_printf("package-to-path failed\n");
1760 /* Save away the TCE table attributes for later use. */
1761 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));
1762 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));
1764 prom_debug("TCE table: %s\n", path);
1765 prom_debug("\tnode = 0x%x\n", node);
1766 prom_debug("\tbase = 0x%x\n", base);
1767 prom_debug("\tsize = 0x%x\n", minsize);
1769 /* Initialize the table to have a one-to-one mapping
1770 * over the allocated size.
1772 tce_entryp = (u64 *)base;
1773 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) {
1774 tce_entry = (i << PAGE_SHIFT);
1776 *tce_entryp = tce_entry;
1779 prom_printf("opening PHB %s", path);
1780 phb_node = call_prom("open", 1, 1, path);
1782 prom_printf("... failed\n");
1784 prom_printf("... done\n");
1786 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1787 phb_node, -1, minsize,
1788 (u32) base, (u32) (base >> 32));
1789 call_prom("close", 1, 0, phb_node);
1792 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);
1794 /* These are only really needed if there is a memory limit in
1795 * effect, but we don't know so export them always. */
1796 prom_tce_alloc_start = local_alloc_bottom;
1797 prom_tce_alloc_end = local_alloc_top;
1799 /* Flag the first invalid entry */
1800 prom_debug("ending prom_initialize_tce_table\n");
1805 * With CHRP SMP we need to use the OF to start the other processors.
1806 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1807 * so we have to put the processors into a holding pattern controlled
1808 * by the kernel (not OF) before we destroy the OF.
1810 * This uses a chunk of low memory, puts some holding pattern
1811 * code there and sends the other processors off to there until
1812 * smp_boot_cpus tells them to do something. The holding pattern
1813 * checks that address until its cpu # is there, when it is that
1814 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1815 * of setting those values.
1817 * We also use physical address 0x4 here to tell when a cpu
1818 * is in its holding pattern code.
1823 * We want to reference the copy of __secondary_hold_* in the
1824 * 0 - 0x100 address range
1826 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1828 static void __init prom_hold_cpus(void)
1834 unsigned long *spinloop
1835 = (void *) LOW_ADDR(__secondary_hold_spinloop);
1836 unsigned long *acknowledge
1837 = (void *) LOW_ADDR(__secondary_hold_acknowledge);
1838 unsigned long secondary_hold = LOW_ADDR(__secondary_hold);
1840 prom_debug("prom_hold_cpus: start...\n");
1841 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop);
1842 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop);
1843 prom_debug(" 1) acknowledge = 0x%x\n",
1844 (unsigned long)acknowledge);
1845 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge);
1846 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold);
1848 /* Set the common spinloop variable, so all of the secondary cpus
1849 * will block when they are awakened from their OF spinloop.
1850 * This must occur for both SMP and non SMP kernels, since OF will
1851 * be trashed when we move the kernel.
1856 for (node = 0; prom_next_node(&node); ) {
1858 prom_getprop(node, "device_type", type, sizeof(type));
1859 if (strcmp(type, "cpu") != 0)
1862 /* Skip non-configured cpus. */
1863 if (prom_getprop(node, "status", type, sizeof(type)) > 0)
1864 if (strcmp(type, "okay") != 0)
1868 prom_getprop(node, "reg", ®, sizeof(reg));
1870 prom_debug("cpu hw idx = %lu\n", reg);
1872 /* Init the acknowledge var which will be reset by
1873 * the secondary cpu when it awakens from its OF
1876 *acknowledge = (unsigned long)-1;
1878 if (reg != prom.cpu) {
1879 /* Primary Thread of non-boot cpu or any thread */
1880 prom_printf("starting cpu hw idx %lu... ", reg);
1881 call_prom("start-cpu", 3, 0, node,
1882 secondary_hold, reg);
1884 for (i = 0; (i < 100000000) &&
1885 (*acknowledge == ((unsigned long)-1)); i++ )
1888 if (*acknowledge == reg)
1889 prom_printf("done\n");
1891 prom_printf("failed: %x\n", *acknowledge);
1895 prom_printf("boot cpu hw idx %lu\n", reg);
1896 #endif /* CONFIG_SMP */
1899 prom_debug("prom_hold_cpus: end...\n");
1903 static void __init prom_init_client_services(unsigned long pp)
1905 /* Get a handle to the prom entry point before anything else */
1908 /* get a handle for the stdout device */
1909 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen"));
1910 if (!PHANDLE_VALID(prom.chosen))
1911 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1913 /* get device tree root */
1914 prom.root = call_prom("finddevice", 1, 1, ADDR("/"));
1915 if (!PHANDLE_VALID(prom.root))
1916 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1923 * For really old powermacs, we need to map things we claim.
1924 * For that, we need the ihandle of the mmu.
1925 * Also, on the longtrail, we need to work around other bugs.
1927 static void __init prom_find_mmu(void)
1932 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom"));
1933 if (!PHANDLE_VALID(oprom))
1935 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0)
1937 version[sizeof(version) - 1] = 0;
1938 /* XXX might need to add other versions here */
1939 if (strcmp(version, "Open Firmware, 1.0.5") == 0)
1940 of_workarounds = OF_WA_CLAIM;
1941 else if (strncmp(version, "FirmWorks,3.", 12) == 0) {
1942 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL;
1943 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1946 prom.memory = call_prom("open", 1, 1, ADDR("/memory"));
1947 prom_getprop(prom.chosen, "mmu", &prom.mmumap,
1948 sizeof(prom.mmumap));
1949 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap))
1950 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */
1953 #define prom_find_mmu()
1956 static void __init prom_init_stdout(void)
1958 char *path = of_stdout_device;
1962 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0)
1963 prom_panic("cannot find stdout");
1967 /* Get the full OF pathname of the stdout device */
1968 memset(path, 0, 256);
1969 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);
1970 val = call_prom("instance-to-package", 1, 1, prom.stdout);
1971 prom_setprop(prom.chosen, "/chosen", "linux,stdout-package",
1973 prom_printf("OF stdout device is: %s\n", of_stdout_device);
1974 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",
1975 path, strlen(path) + 1);
1977 /* If it's a display, note it */
1978 memset(type, 0, sizeof(type));
1979 prom_getprop(val, "device_type", type, sizeof(type));
1980 if (strcmp(type, "display") == 0)
1981 prom_setprop(val, path, "linux,boot-display", NULL, 0);
1984 static int __init prom_find_machine_type(void)
1993 /* Look for a PowerMac or a Cell */
1994 len = prom_getprop(prom.root, "compatible",
1995 compat, sizeof(compat)-1);
1999 char *p = &compat[i];
2003 if (strstr(p, "Power Macintosh") ||
2004 strstr(p, "MacRISC"))
2005 return PLATFORM_POWERMAC;
2007 /* We must make sure we don't detect the IBM Cell
2008 * blades as pSeries due to some firmware issues,
2011 if (strstr(p, "IBM,CBEA") ||
2012 strstr(p, "IBM,CPBW-1.0"))
2013 return PLATFORM_GENERIC;
2014 #endif /* CONFIG_PPC64 */
2019 /* Try to detect OPAL */
2020 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
2021 return PLATFORM_OPAL;
2023 /* Try to figure out if it's an IBM pSeries or any other
2024 * PAPR compliant platform. We assume it is if :
2025 * - /device_type is "chrp" (please, do NOT use that for future
2029 len = prom_getprop(prom.root, "device_type",
2030 compat, sizeof(compat)-1);
2032 return PLATFORM_GENERIC;
2033 if (strcmp(compat, "chrp"))
2034 return PLATFORM_GENERIC;
2036 /* Default to pSeries. We need to know if we are running LPAR */
2037 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));
2038 if (!PHANDLE_VALID(rtas))
2039 return PLATFORM_GENERIC;
2040 x = prom_getproplen(rtas, "ibm,hypertas-functions");
2041 if (x != PROM_ERROR) {
2042 prom_debug("Hypertas detected, assuming LPAR !\n");
2043 return PLATFORM_PSERIES_LPAR;
2045 return PLATFORM_PSERIES;
2047 return PLATFORM_GENERIC;
2051 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b)
2053 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);
2057 * If we have a display that we don't know how to drive,
2058 * we will want to try to execute OF's open method for it
2059 * later. However, OF will probably fall over if we do that
2060 * we've taken over the MMU.
2061 * So we check whether we will need to open the display,
2062 * and if so, open it now.
2064 static void __init prom_check_displays(void)
2066 char type[16], *path;
2071 static unsigned char default_colors[] = {
2089 const unsigned char *clut;
2091 prom_debug("Looking for displays\n");
2092 for (node = 0; prom_next_node(&node); ) {
2093 memset(type, 0, sizeof(type));
2094 prom_getprop(node, "device_type", type, sizeof(type));
2095 if (strcmp(type, "display") != 0)
2098 /* It seems OF doesn't null-terminate the path :-( */
2099 path = prom_scratch;
2100 memset(path, 0, PROM_SCRATCH_SIZE);
2103 * leave some room at the end of the path for appending extra
2106 if (call_prom("package-to-path", 3, 1, node, path,
2107 PROM_SCRATCH_SIZE-10) == PROM_ERROR)
2109 prom_printf("found display : %s, opening... ", path);
2111 ih = call_prom("open", 1, 1, path);
2113 prom_printf("failed\n");
2118 prom_printf("done\n");
2119 prom_setprop(node, path, "linux,opened", NULL, 0);
2121 /* Setup a usable color table when the appropriate
2122 * method is available. Should update this to set-colors */
2123 clut = default_colors;
2124 for (i = 0; i < 16; i++, clut += 3)
2125 if (prom_set_color(ih, i, clut[0], clut[1],
2129 #ifdef CONFIG_LOGO_LINUX_CLUT224
2130 clut = PTRRELOC(logo_linux_clut224.clut);
2131 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3)
2132 if (prom_set_color(ih, i + 32, clut[0], clut[1],
2135 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2140 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2141 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end,
2142 unsigned long needed, unsigned long align)
2146 *mem_start = _ALIGN(*mem_start, align);
2147 while ((*mem_start + needed) > *mem_end) {
2148 unsigned long room, chunk;
2150 prom_debug("Chunk exhausted, claiming more at %x...\n",
2152 room = alloc_top - alloc_bottom;
2153 if (room > DEVTREE_CHUNK_SIZE)
2154 room = DEVTREE_CHUNK_SIZE;
2155 if (room < PAGE_SIZE)
2156 prom_panic("No memory for flatten_device_tree "
2158 chunk = alloc_up(room, 0);
2160 prom_panic("No memory for flatten_device_tree "
2161 "(claim failed)\n");
2162 *mem_end = chunk + room;
2165 ret = (void *)*mem_start;
2166 *mem_start += needed;
2171 #define dt_push_token(token, mem_start, mem_end) \
2172 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
2174 static unsigned long __init dt_find_string(char *str)
2178 s = os = (char *)dt_string_start;
2180 while (s < (char *)dt_string_end) {
2181 if (strcmp(s, str) == 0)
2189 * The Open Firmware 1275 specification states properties must be 31 bytes or
2190 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2192 #define MAX_PROPERTY_NAME 64
2194 static void __init scan_dt_build_strings(phandle node,
2195 unsigned long *mem_start,
2196 unsigned long *mem_end)
2198 char *prev_name, *namep, *sstart;
2202 sstart = (char *)dt_string_start;
2204 /* get and store all property names */
2207 /* 64 is max len of name including nul. */
2208 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1);
2209 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) {
2210 /* No more nodes: unwind alloc */
2211 *mem_start = (unsigned long)namep;
2216 if (strcmp(namep, "name") == 0) {
2217 *mem_start = (unsigned long)namep;
2221 /* get/create string entry */
2222 soff = dt_find_string(namep);
2224 *mem_start = (unsigned long)namep;
2225 namep = sstart + soff;
2227 /* Trim off some if we can */
2228 *mem_start = (unsigned long)namep + strlen(namep) + 1;
2229 dt_string_end = *mem_start;
2234 /* do all our children */
2235 child = call_prom("child", 1, 1, node);
2236 while (child != 0) {
2237 scan_dt_build_strings(child, mem_start, mem_end);
2238 child = call_prom("peer", 1, 1, child);
2242 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start,
2243 unsigned long *mem_end)
2246 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path;
2248 unsigned char *valp;
2249 static char pname[MAX_PROPERTY_NAME];
2250 int l, room, has_phandle = 0;
2252 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end);
2254 /* get the node's full name */
2255 namep = (char *)*mem_start;
2256 room = *mem_end - *mem_start;
2259 l = call_prom("package-to-path", 3, 1, node, namep, room);
2261 /* Didn't fit? Get more room. */
2263 if (l >= *mem_end - *mem_start)
2264 namep = make_room(mem_start, mem_end, l+1, 1);
2265 call_prom("package-to-path", 3, 1, node, namep, l);
2269 /* Fixup an Apple bug where they have bogus \0 chars in the
2270 * middle of the path in some properties, and extract
2271 * the unit name (everything after the last '/').
2273 for (lp = p = namep, ep = namep + l; p < ep; p++) {
2280 *mem_start = _ALIGN((unsigned long)lp + 1, 4);
2283 /* get it again for debugging */
2284 path = prom_scratch;
2285 memset(path, 0, PROM_SCRATCH_SIZE);
2286 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1);
2288 /* get and store all properties */
2290 sstart = (char *)dt_string_start;
2292 if (call_prom("nextprop", 3, 1, node, prev_name,
2297 if (strcmp(pname, "name") == 0) {
2302 /* find string offset */
2303 soff = dt_find_string(pname);
2305 prom_printf("WARNING: Can't find string index for"
2306 " <%s>, node %s\n", pname, path);
2309 prev_name = sstart + soff;
2312 l = call_prom("getproplen", 2, 1, node, pname);
2315 if (l == PROM_ERROR)
2318 /* push property head */
2319 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2320 dt_push_token(l, mem_start, mem_end);
2321 dt_push_token(soff, mem_start, mem_end);
2323 /* push property content */
2324 valp = make_room(mem_start, mem_end, l, 4);
2325 call_prom("getprop", 4, 1, node, pname, valp, l);
2326 *mem_start = _ALIGN(*mem_start, 4);
2328 if (!strcmp(pname, "phandle"))
2332 /* Add a "linux,phandle" property if no "phandle" property already
2333 * existed (can happen with OPAL)
2336 soff = dt_find_string("linux,phandle");
2338 prom_printf("WARNING: Can't find string index for"
2339 " <linux-phandle> node %s\n", path);
2341 dt_push_token(OF_DT_PROP, mem_start, mem_end);
2342 dt_push_token(4, mem_start, mem_end);
2343 dt_push_token(soff, mem_start, mem_end);
2344 valp = make_room(mem_start, mem_end, 4, 4);
2345 *(u32 *)valp = node;
2349 /* do all our children */
2350 child = call_prom("child", 1, 1, node);
2351 while (child != 0) {
2352 scan_dt_build_struct(child, mem_start, mem_end);
2353 child = call_prom("peer", 1, 1, child);
2356 dt_push_token(OF_DT_END_NODE, mem_start, mem_end);
2359 static void __init flatten_device_tree(void)
2362 unsigned long mem_start, mem_end, room;
2363 struct boot_param_header *hdr;
2368 * Check how much room we have between alloc top & bottom (+/- a
2369 * few pages), crop to 1MB, as this is our "chunk" size
2371 room = alloc_top - alloc_bottom - 0x4000;
2372 if (room > DEVTREE_CHUNK_SIZE)
2373 room = DEVTREE_CHUNK_SIZE;
2374 prom_debug("starting device tree allocs at %x\n", alloc_bottom);
2376 /* Now try to claim that */
2377 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE);
2379 prom_panic("Can't allocate initial device-tree chunk\n");
2380 mem_end = mem_start + room;
2382 /* Get root of tree */
2383 root = call_prom("peer", 1, 1, (phandle)0);
2384 if (root == (phandle)0)
2385 prom_panic ("couldn't get device tree root\n");
2387 /* Build header and make room for mem rsv map */
2388 mem_start = _ALIGN(mem_start, 4);
2389 hdr = make_room(&mem_start, &mem_end,
2390 sizeof(struct boot_param_header), 4);
2391 dt_header_start = (unsigned long)hdr;
2392 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8);
2394 /* Start of strings */
2395 mem_start = PAGE_ALIGN(mem_start);
2396 dt_string_start = mem_start;
2397 mem_start += 4; /* hole */
2399 /* Add "linux,phandle" in there, we'll need it */
2400 namep = make_room(&mem_start, &mem_end, 16, 1);
2401 strcpy(namep, "linux,phandle");
2402 mem_start = (unsigned long)namep + strlen(namep) + 1;
2404 /* Build string array */
2405 prom_printf("Building dt strings...\n");
2406 scan_dt_build_strings(root, &mem_start, &mem_end);
2407 dt_string_end = mem_start;
2409 /* Build structure */
2410 mem_start = PAGE_ALIGN(mem_start);
2411 dt_struct_start = mem_start;
2412 prom_printf("Building dt structure...\n");
2413 scan_dt_build_struct(root, &mem_start, &mem_end);
2414 dt_push_token(OF_DT_END, &mem_start, &mem_end);
2415 dt_struct_end = PAGE_ALIGN(mem_start);
2418 hdr->boot_cpuid_phys = prom.cpu;
2419 hdr->magic = OF_DT_HEADER;
2420 hdr->totalsize = dt_struct_end - dt_header_start;
2421 hdr->off_dt_struct = dt_struct_start - dt_header_start;
2422 hdr->off_dt_strings = dt_string_start - dt_header_start;
2423 hdr->dt_strings_size = dt_string_end - dt_string_start;
2424 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - dt_header_start;
2425 hdr->version = OF_DT_VERSION;
2426 /* Version 16 is not backward compatible */
2427 hdr->last_comp_version = 0x10;
2429 /* Copy the reserve map in */
2430 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map));
2435 prom_printf("reserved memory map:\n");
2436 for (i = 0; i < mem_reserve_cnt; i++)
2437 prom_printf(" %x - %x\n",
2438 mem_reserve_map[i].base,
2439 mem_reserve_map[i].size);
2442 /* Bump mem_reserve_cnt to cause further reservations to fail
2443 * since it's too late.
2445 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE;
2447 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2448 dt_string_start, dt_string_end);
2449 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2450 dt_struct_start, dt_struct_end);
2454 #ifdef CONFIG_PPC_MAPLE
2455 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2456 * The values are bad, and it doesn't even have the right number of cells. */
2457 static void __init fixup_device_tree_maple(void)
2460 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */
2464 name = "/ht@0/isa@4";
2465 isa = call_prom("finddevice", 1, 1, ADDR(name));
2466 if (!PHANDLE_VALID(isa)) {
2467 name = "/ht@0/isa@6";
2468 isa = call_prom("finddevice", 1, 1, ADDR(name));
2469 rloc = 0x01003000; /* IO space; PCI device = 6 */
2471 if (!PHANDLE_VALID(isa))
2474 if (prom_getproplen(isa, "ranges") != 12)
2476 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges))
2480 if (isa_ranges[0] != 0x1 ||
2481 isa_ranges[1] != 0xf4000000 ||
2482 isa_ranges[2] != 0x00010000)
2485 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2487 isa_ranges[0] = 0x1;
2488 isa_ranges[1] = 0x0;
2489 isa_ranges[2] = rloc;
2490 isa_ranges[3] = 0x0;
2491 isa_ranges[4] = 0x0;
2492 isa_ranges[5] = 0x00010000;
2493 prom_setprop(isa, name, "ranges",
2494 isa_ranges, sizeof(isa_ranges));
2497 #define CPC925_MC_START 0xf8000000
2498 #define CPC925_MC_LENGTH 0x1000000
2499 /* The values for memory-controller don't have right number of cells */
2500 static void __init fixup_device_tree_maple_memory_controller(void)
2504 char *name = "/hostbridge@f8000000";
2507 mc = call_prom("finddevice", 1, 1, ADDR(name));
2508 if (!PHANDLE_VALID(mc))
2511 if (prom_getproplen(mc, "reg") != 8)
2514 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));
2515 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));
2516 if ((ac != 2) || (sc != 2))
2519 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR)
2522 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH)
2525 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2528 mc_reg[1] = CPC925_MC_START;
2530 mc_reg[3] = CPC925_MC_LENGTH;
2531 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg));
2534 #define fixup_device_tree_maple()
2535 #define fixup_device_tree_maple_memory_controller()
2538 #ifdef CONFIG_PPC_CHRP
2540 * Pegasos and BriQ lacks the "ranges" property in the isa node
2541 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2542 * Pegasos has the IDE configured in legacy mode, but advertised as native
2544 static void __init fixup_device_tree_chrp(void)
2548 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */
2552 name = "/pci@80000000/isa@c";
2553 ph = call_prom("finddevice", 1, 1, ADDR(name));
2554 if (!PHANDLE_VALID(ph)) {
2555 name = "/pci@ff500000/isa@6";
2556 ph = call_prom("finddevice", 1, 1, ADDR(name));
2557 rloc = 0x01003000; /* IO space; PCI device = 6 */
2559 if (PHANDLE_VALID(ph)) {
2560 rc = prom_getproplen(ph, "ranges");
2561 if (rc == 0 || rc == PROM_ERROR) {
2562 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2569 prop[5] = 0x00010000;
2570 prom_setprop(ph, name, "ranges", prop, sizeof(prop));
2574 name = "/pci@80000000/ide@C,1";
2575 ph = call_prom("finddevice", 1, 1, ADDR(name));
2576 if (PHANDLE_VALID(ph)) {
2577 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2580 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32));
2581 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2582 rc = prom_getprop(ph, "class-code", prop, sizeof(u32));
2583 if (rc == sizeof(u32)) {
2585 prom_setprop(ph, name, "class-code", prop, sizeof(u32));
2590 #define fixup_device_tree_chrp()
2593 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2594 static void __init fixup_device_tree_pmac(void)
2596 phandle u3, i2c, mpic;
2601 /* Some G5s have a missing interrupt definition, fix it up here */
2602 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2603 if (!PHANDLE_VALID(u3))
2605 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2606 if (!PHANDLE_VALID(i2c))
2608 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2609 if (!PHANDLE_VALID(mpic))
2612 /* check if proper rev of u3 */
2613 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))
2616 if (u3_rev < 0x35 || u3_rev > 0x39)
2618 /* does it need fixup ? */
2619 if (prom_getproplen(i2c, "interrupts") > 0)
2622 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2624 /* interrupt on this revision of u3 is number 0 and level */
2627 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2628 &interrupts, sizeof(interrupts));
2630 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2631 &parent, sizeof(parent));
2634 #define fixup_device_tree_pmac()
2637 #ifdef CONFIG_PPC_EFIKA
2639 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2640 * to talk to the phy. If the phy-handle property is missing, then this
2641 * function is called to add the appropriate nodes and link it to the
2644 static void __init fixup_device_tree_efika_add_phy(void)
2650 /* Check if /builtin/ethernet exists - bail if it doesn't */
2651 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2652 if (!PHANDLE_VALID(node))
2655 /* Check if the phy-handle property exists - bail if it does */
2656 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));
2661 * At this point the ethernet device doesn't have a phy described.
2662 * Now we need to add the missing phy node and linkage
2665 /* Check for an MDIO bus node - if missing then create one */
2666 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2667 if (!PHANDLE_VALID(node)) {
2668 prom_printf("Adding Ethernet MDIO node\n");
2669 call_prom("interpret", 1, 1,
2670 " s\" /builtin\" find-device"
2672 " 1 encode-int s\" #address-cells\" property"
2673 " 0 encode-int s\" #size-cells\" property"
2674 " s\" mdio\" device-name"
2675 " s\" fsl,mpc5200b-mdio\" encode-string"
2676 " s\" compatible\" property"
2677 " 0xf0003000 0x400 reg"
2679 " 0x5 encode-int encode+"
2680 " 0x3 encode-int encode+"
2681 " s\" interrupts\" property"
2685 /* Check for a PHY device node - if missing then create one and
2686 * give it's phandle to the ethernet node */
2687 node = call_prom("finddevice", 1, 1,
2688 ADDR("/builtin/mdio/ethernet-phy"));
2689 if (!PHANDLE_VALID(node)) {
2690 prom_printf("Adding Ethernet PHY node\n");
2691 call_prom("interpret", 1, 1,
2692 " s\" /builtin/mdio\" find-device"
2694 " s\" ethernet-phy\" device-name"
2695 " 0x10 encode-int s\" reg\" property"
2699 " s\" /builtin/ethernet\" find-device"
2701 " s\" phy-handle\" property"
2706 static void __init fixup_device_tree_efika(void)
2708 int sound_irq[3] = { 2, 2, 0 };
2709 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2710 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2711 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2712 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2717 /* Check if we're really running on a EFIKA */
2718 node = call_prom("finddevice", 1, 1, ADDR("/"));
2719 if (!PHANDLE_VALID(node))
2722 rv = prom_getprop(node, "model", prop, sizeof(prop));
2723 if (rv == PROM_ERROR)
2725 if (strcmp(prop, "EFIKA5K2"))
2728 prom_printf("Applying EFIKA device tree fixups\n");
2730 /* Claiming to be 'chrp' is death */
2731 node = call_prom("finddevice", 1, 1, ADDR("/"));
2732 rv = prom_getprop(node, "device_type", prop, sizeof(prop));
2733 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0))
2734 prom_setprop(node, "/", "device_type", "efika", sizeof("efika"));
2736 /* CODEGEN,description is exposed in /proc/cpuinfo so
2738 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop));
2739 if (rv != PROM_ERROR && (strstr(prop, "CHRP")))
2740 prom_setprop(node, "/", "CODEGEN,description",
2741 "Efika 5200B PowerPC System",
2742 sizeof("Efika 5200B PowerPC System"));
2744 /* Fixup bestcomm interrupts property */
2745 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2746 if (PHANDLE_VALID(node)) {
2747 len = prom_getproplen(node, "interrupts");
2749 prom_printf("Fixing bestcomm interrupts property\n");
2750 prom_setprop(node, "/builtin/bestcom", "interrupts",
2751 bcomm_irq, sizeof(bcomm_irq));
2755 /* Fixup sound interrupts property */
2756 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2757 if (PHANDLE_VALID(node)) {
2758 rv = prom_getprop(node, "interrupts", prop, sizeof(prop));
2759 if (rv == PROM_ERROR) {
2760 prom_printf("Adding sound interrupts property\n");
2761 prom_setprop(node, "/builtin/sound", "interrupts",
2762 sound_irq, sizeof(sound_irq));
2766 /* Make sure ethernet phy-handle property exists */
2767 fixup_device_tree_efika_add_phy();
2770 #define fixup_device_tree_efika()
2773 static void __init fixup_device_tree(void)
2775 fixup_device_tree_maple();
2776 fixup_device_tree_maple_memory_controller();
2777 fixup_device_tree_chrp();
2778 fixup_device_tree_pmac();
2779 fixup_device_tree_efika();
2782 static void __init prom_find_boot_cpu(void)
2789 if (prom_getprop(prom.chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0)
2792 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);
2794 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval));
2795 prom.cpu = getprop_rval;
2797 prom_debug("Booting CPU hw index = %lu\n", prom.cpu);
2800 static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
2802 #ifdef CONFIG_BLK_DEV_INITRD
2803 if (r3 && r4 && r4 != 0xdeadbeef) {
2806 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3;
2807 prom_initrd_end = prom_initrd_start + r4;
2809 val = prom_initrd_start;
2810 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",
2812 val = prom_initrd_end;
2813 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",
2816 reserve_mem(prom_initrd_start,
2817 prom_initrd_end - prom_initrd_start);
2819 prom_debug("initrd_start=0x%x\n", prom_initrd_start);
2820 prom_debug("initrd_end=0x%x\n", prom_initrd_end);
2822 #endif /* CONFIG_BLK_DEV_INITRD */
2826 #ifdef CONFIG_RELOCATABLE
2827 static void reloc_toc(void)
2831 static void unreloc_toc(void)
2835 static void __reloc_toc(void *tocstart, unsigned long offset,
2836 unsigned long nr_entries)
2839 unsigned long *toc_entry = (unsigned long *)tocstart;
2841 for (i = 0; i < nr_entries; i++) {
2842 *toc_entry = *toc_entry + offset;
2847 static void reloc_toc(void)
2849 unsigned long offset = reloc_offset();
2850 unsigned long nr_entries =
2851 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2853 /* Need to add offset to get at __prom_init_toc_start */
2854 __reloc_toc(__prom_init_toc_start + offset, offset, nr_entries);
2859 static void unreloc_toc(void)
2861 unsigned long offset = reloc_offset();
2862 unsigned long nr_entries =
2863 (__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);
2867 /* __prom_init_toc_start has been relocated, no need to add offset */
2868 __reloc_toc(__prom_init_toc_start, -offset, nr_entries);
2874 * We enter here early on, when the Open Firmware prom is still
2875 * handling exceptions and the MMU hash table for us.
2878 unsigned long __init prom_init(unsigned long r3, unsigned long r4,
2880 unsigned long r6, unsigned long r7,
2881 unsigned long kbase)
2886 unsigned long offset = reloc_offset();
2893 * First zero the BSS
2895 memset(&__bss_start, 0, __bss_stop - __bss_start);
2898 * Init interface to Open Firmware, get some node references,
2901 prom_init_client_services(pp);
2904 * See if this OF is old enough that we need to do explicit maps
2905 * and other workarounds
2910 * Init prom stdout device
2914 prom_printf("Preparing to boot %s", linux_banner);
2917 * Get default machine type. At this point, we do not differentiate
2918 * between pSeries SMP and pSeries LPAR
2920 of_platform = prom_find_machine_type();
2921 prom_printf("Detected machine type: %x\n", of_platform);
2923 #ifndef CONFIG_NONSTATIC_KERNEL
2924 /* Bail if this is a kdump kernel. */
2925 if (PHYSICAL_START > 0)
2926 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2930 * Check for an initrd
2932 prom_check_initrd(r3, r4);
2934 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2936 * On pSeries, inform the firmware about our capabilities
2938 if (of_platform == PLATFORM_PSERIES ||
2939 of_platform == PLATFORM_PSERIES_LPAR)
2940 prom_send_capabilities();
2944 * Copy the CPU hold code
2946 if (of_platform != PLATFORM_POWERMAC)
2947 copy_and_flush(0, kbase, 0x100, 0);
2950 * Do early parsing of command line
2952 early_cmdline_parse();
2955 * Initialize memory management within prom_init
2960 * Determine which cpu is actually running right _now_
2962 prom_find_boot_cpu();
2965 * Initialize display devices
2967 prom_check_displays();
2971 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2972 * that uses the allocator, we need to make sure we get the top of memory
2973 * available for us here...
2975 if (of_platform == PLATFORM_PSERIES)
2976 prom_initialize_tce_table();
2980 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2981 * have a usable RTAS implementation.
2983 if (of_platform != PLATFORM_POWERMAC &&
2984 of_platform != PLATFORM_OPAL)
2985 prom_instantiate_rtas();
2987 #ifdef CONFIG_PPC_POWERNV
2988 /* Detect HAL and try instanciating it & doing takeover */
2989 if (of_platform == PLATFORM_PSERIES_LPAR) {
2991 if (of_platform == PLATFORM_OPAL) {
2992 prom_opal_hold_cpus();
2993 prom_opal_takeover();
2995 } else if (of_platform == PLATFORM_OPAL)
2996 prom_instantiate_opal();
3000 /* instantiate sml */
3001 prom_instantiate_sml();
3005 * On non-powermacs, put all CPUs in spin-loops.
3007 * PowerMacs use a different mechanism to spin CPUs
3009 if (of_platform != PLATFORM_POWERMAC &&
3010 of_platform != PLATFORM_OPAL)
3014 * Fill in some infos for use by the kernel later on
3016 if (prom_memory_limit)
3017 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",
3019 sizeof(prom_memory_limit));
3022 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",
3025 if (prom_iommu_force_on)
3026 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",
3029 if (prom_tce_alloc_start) {
3030 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",
3031 &prom_tce_alloc_start,
3032 sizeof(prom_tce_alloc_start));
3033 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",
3034 &prom_tce_alloc_end,
3035 sizeof(prom_tce_alloc_end));
3040 * Fixup any known bugs in the device-tree
3042 fixup_device_tree();
3045 * Now finally create the flattened device-tree
3047 prom_printf("copying OF device tree...\n");
3048 flatten_device_tree();
3051 * in case stdin is USB and still active on IBM machines...
3052 * Unfortunately quiesce crashes on some powermacs if we have
3053 * closed stdin already (in particular the powerbook 101). It
3054 * appears that the OPAL version of OFW doesn't like it either.
3056 if (of_platform != PLATFORM_POWERMAC &&
3057 of_platform != PLATFORM_OPAL)
3061 * Call OF "quiesce" method to shut down pending DMA's from
3064 prom_printf("Calling quiesce...\n");
3065 call_prom("quiesce", 0, 0);
3068 * And finally, call the kernel passing it the flattened device
3069 * tree and NULL as r5, thus triggering the new entry point which
3070 * is common to us and kexec
3072 hdr = dt_header_start;
3074 /* Don't print anything after quiesce under OPAL, it crashes OFW */
3075 if (of_platform != PLATFORM_OPAL) {
3076 prom_printf("returning from prom_init\n");
3077 prom_debug("->dt_header_start=0x%x\n", hdr);
3081 reloc_got2(-offset);
3086 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
3087 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
3088 __start(hdr, kbase, 0, 0, 0,
3089 prom_opal_base, prom_opal_entry);
3091 __start(hdr, kbase, 0, 0, 0, 0, 0);