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 * On ppc64 we have to relocate the references explicitly with
70 * RELOC. (Note that strings count as static variables.)
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).
83 #define RELOC(x) (*PTRRELOC(&(x)))
84 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
85 #define OF_WORKAROUNDS 0
88 #define ADDR(x) (u32) (x)
89 #define OF_WORKAROUNDS of_workarounds
93 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
94 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
96 #define PROM_BUG() do { \
97 prom_printf("kernel BUG at %s line 0x%x!\n", \
98 RELOC(__FILE__), __LINE__); \
99 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
103 #define prom_debug(x...) prom_printf(x)
105 #define prom_debug(x...)
109 typedef u32 prom_arg_t
;
127 struct mem_map_entry
{
134 extern void __start(unsigned long r3
, unsigned long r4
, unsigned long r5
,
135 unsigned long r6
, unsigned long r7
, unsigned long r8
,
139 extern int enter_prom(struct prom_args
*args
, unsigned long entry
);
141 static inline int enter_prom(struct prom_args
*args
, unsigned long entry
)
143 return ((int (*)(struct prom_args
*))entry
)(args
);
147 extern void copy_and_flush(unsigned long dest
, unsigned long src
,
148 unsigned long size
, unsigned long offset
);
151 static struct prom_t __initdata prom
;
153 static unsigned long prom_entry __initdata
;
155 #define PROM_SCRATCH_SIZE 256
157 static char __initdata of_stdout_device
[256];
158 static char __initdata prom_scratch
[PROM_SCRATCH_SIZE
];
160 static unsigned long __initdata dt_header_start
;
161 static unsigned long __initdata dt_struct_start
, dt_struct_end
;
162 static unsigned long __initdata dt_string_start
, dt_string_end
;
164 static unsigned long __initdata prom_initrd_start
, prom_initrd_end
;
167 static int __initdata prom_iommu_force_on
;
168 static int __initdata prom_iommu_off
;
169 static unsigned long __initdata prom_tce_alloc_start
;
170 static unsigned long __initdata prom_tce_alloc_end
;
173 /* Platforms codes are now obsolete in the kernel. Now only used within this
174 * file and ultimately gone too. Feel free to change them if you need, they
175 * are not shared with anything outside of this file anymore
177 #define PLATFORM_PSERIES 0x0100
178 #define PLATFORM_PSERIES_LPAR 0x0101
179 #define PLATFORM_LPAR 0x0001
180 #define PLATFORM_POWERMAC 0x0400
181 #define PLATFORM_GENERIC 0x0500
182 #define PLATFORM_OPAL 0x0600
184 static int __initdata of_platform
;
186 static char __initdata prom_cmd_line
[COMMAND_LINE_SIZE
];
188 static unsigned long __initdata prom_memory_limit
;
190 static unsigned long __initdata alloc_top
;
191 static unsigned long __initdata alloc_top_high
;
192 static unsigned long __initdata alloc_bottom
;
193 static unsigned long __initdata rmo_top
;
194 static unsigned long __initdata ram_top
;
196 static struct mem_map_entry __initdata mem_reserve_map
[MEM_RESERVE_MAP_SIZE
];
197 static int __initdata mem_reserve_cnt
;
199 static cell_t __initdata regbuf
[1024];
203 * Error results ... some OF calls will return "-1" on error, some
204 * will return 0, some will return either. To simplify, here are
205 * macros to use with any ihandle or phandle return value to check if
209 #define PROM_ERROR (-1u)
210 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
211 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
214 /* This is the one and *ONLY* place where we actually call open
218 static int __init
call_prom(const char *service
, int nargs
, int nret
, ...)
221 struct prom_args args
;
224 args
.service
= ADDR(service
);
228 va_start(list
, nret
);
229 for (i
= 0; i
< nargs
; i
++)
230 args
.args
[i
] = va_arg(list
, prom_arg_t
);
233 for (i
= 0; i
< nret
; i
++)
234 args
.args
[nargs
+i
] = 0;
236 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
239 return (nret
> 0) ? args
.args
[nargs
] : 0;
242 static int __init
call_prom_ret(const char *service
, int nargs
, int nret
,
243 prom_arg_t
*rets
, ...)
246 struct prom_args args
;
249 args
.service
= ADDR(service
);
253 va_start(list
, rets
);
254 for (i
= 0; i
< nargs
; i
++)
255 args
.args
[i
] = va_arg(list
, prom_arg_t
);
258 for (i
= 0; i
< nret
; i
++)
259 args
.args
[nargs
+i
] = 0;
261 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
265 for (i
= 1; i
< nret
; ++i
)
266 rets
[i
-1] = args
.args
[nargs
+i
];
268 return (nret
> 0) ? args
.args
[nargs
] : 0;
272 static void __init
prom_print(const char *msg
)
275 struct prom_t
*_prom
= &RELOC(prom
);
277 if (_prom
->stdout
== 0)
280 for (p
= msg
; *p
!= 0; p
= q
) {
281 for (q
= p
; *q
!= 0 && *q
!= '\n'; ++q
)
284 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
288 call_prom("write", 3, 1, _prom
->stdout
, ADDR("\r\n"), 2);
293 static void __init
prom_print_hex(unsigned long val
)
295 int i
, nibbles
= sizeof(val
)*2;
296 char buf
[sizeof(val
)*2+1];
297 struct prom_t
*_prom
= &RELOC(prom
);
299 for (i
= nibbles
-1; i
>= 0; i
--) {
300 buf
[i
] = (val
& 0xf) + '0';
302 buf
[i
] += ('a'-'0'-10);
306 call_prom("write", 3, 1, _prom
->stdout
, buf
, nibbles
);
309 /* max number of decimal digits in an unsigned long */
311 static void __init
prom_print_dec(unsigned long val
)
314 char buf
[UL_DIGITS
+1];
315 struct prom_t
*_prom
= &RELOC(prom
);
317 for (i
= UL_DIGITS
-1; i
>= 0; i
--) {
318 buf
[i
] = (val
% 10) + '0';
323 /* shift stuff down */
324 size
= UL_DIGITS
- i
;
325 call_prom("write", 3, 1, _prom
->stdout
, buf
+i
, size
);
328 static void __init
prom_printf(const char *format
, ...)
330 const char *p
, *q
, *s
;
334 struct prom_t
*_prom
= &RELOC(prom
);
336 va_start(args
, format
);
338 format
= PTRRELOC(format
);
340 for (p
= format
; *p
!= 0; p
= q
) {
341 for (q
= p
; *q
!= 0 && *q
!= '\n' && *q
!= '%'; ++q
)
344 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
349 call_prom("write", 3, 1, _prom
->stdout
,
359 s
= va_arg(args
, const char *);
364 v
= va_arg(args
, unsigned long);
369 vs
= va_arg(args
, int);
371 prom_print(RELOC("-"));
380 else if (*q
== 'x') {
382 v
= va_arg(args
, unsigned long);
384 } else if (*q
== 'u') { /* '%lu' */
386 v
= va_arg(args
, unsigned long);
388 } else if (*q
== 'd') { /* %ld */
390 vs
= va_arg(args
, long);
392 prom_print(RELOC("-"));
403 static unsigned int __init
prom_claim(unsigned long virt
, unsigned long size
,
406 struct prom_t
*_prom
= &RELOC(prom
);
408 if (align
== 0 && (OF_WORKAROUNDS
& OF_WA_CLAIM
)) {
410 * Old OF requires we claim physical and virtual separately
411 * and then map explicitly (assuming virtual mode)
416 ret
= call_prom_ret("call-method", 5, 2, &result
,
417 ADDR("claim"), _prom
->memory
,
419 if (ret
!= 0 || result
== -1)
421 ret
= call_prom_ret("call-method", 5, 2, &result
,
422 ADDR("claim"), _prom
->mmumap
,
425 call_prom("call-method", 4, 1, ADDR("release"),
426 _prom
->memory
, size
, virt
);
429 /* the 0x12 is M (coherence) + PP == read/write */
430 call_prom("call-method", 6, 1,
431 ADDR("map"), _prom
->mmumap
, 0x12, size
, virt
, virt
);
434 return call_prom("claim", 3, 1, (prom_arg_t
)virt
, (prom_arg_t
)size
,
438 static void __init
__attribute__((noreturn
)) prom_panic(const char *reason
)
441 reason
= PTRRELOC(reason
);
444 /* Do not call exit because it clears the screen on pmac
445 * it also causes some sort of double-fault on early pmacs */
446 if (RELOC(of_platform
) == PLATFORM_POWERMAC
)
449 /* ToDo: should put up an SRC here on p/iSeries */
450 call_prom("exit", 0, 0);
452 for (;;) /* should never get here */
457 static int __init
prom_next_node(phandle
*nodep
)
461 if ((node
= *nodep
) != 0
462 && (*nodep
= call_prom("child", 1, 1, node
)) != 0)
464 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
467 if ((node
= call_prom("parent", 1, 1, node
)) == 0)
469 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
474 static int inline prom_getprop(phandle node
, const char *pname
,
475 void *value
, size_t valuelen
)
477 return call_prom("getprop", 4, 1, node
, ADDR(pname
),
478 (u32
)(unsigned long) value
, (u32
) valuelen
);
481 static int inline prom_getproplen(phandle node
, const char *pname
)
483 return call_prom("getproplen", 2, 1, node
, ADDR(pname
));
486 static void add_string(char **str
, const char *q
)
496 static char *tohex(unsigned int x
)
498 static char digits
[] = "0123456789abcdef";
499 static char result
[9];
506 result
[i
] = digits
[x
& 0xf];
508 } while (x
!= 0 && i
> 0);
512 static int __init
prom_setprop(phandle node
, const char *nodename
,
513 const char *pname
, void *value
, size_t valuelen
)
517 if (!(OF_WORKAROUNDS
& OF_WA_LONGTRAIL
))
518 return call_prom("setprop", 4, 1, node
, ADDR(pname
),
519 (u32
)(unsigned long) value
, (u32
) valuelen
);
521 /* gah... setprop doesn't work on longtrail, have to use interpret */
523 add_string(&p
, "dev");
524 add_string(&p
, nodename
);
525 add_string(&p
, tohex((u32
)(unsigned long) value
));
526 add_string(&p
, tohex(valuelen
));
527 add_string(&p
, tohex(ADDR(pname
)));
528 add_string(&p
, tohex(strlen(RELOC(pname
))));
529 add_string(&p
, "property");
531 return call_prom("interpret", 1, 1, (u32
)(unsigned long) cmd
);
534 /* We can't use the standard versions because of RELOC headaches. */
535 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
536 || ('a' <= (c) && (c) <= 'f') \
537 || ('A' <= (c) && (c) <= 'F'))
539 #define isdigit(c) ('0' <= (c) && (c) <= '9')
540 #define islower(c) ('a' <= (c) && (c) <= 'z')
541 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
543 unsigned long prom_strtoul(const char *cp
, const char **endp
)
545 unsigned long result
= 0, base
= 10, value
;
550 if (toupper(*cp
) == 'X') {
556 while (isxdigit(*cp
) &&
557 (value
= isdigit(*cp
) ? *cp
- '0' : toupper(*cp
) - 'A' + 10) < base
) {
558 result
= result
* base
+ value
;
568 unsigned long prom_memparse(const char *ptr
, const char **retptr
)
570 unsigned long ret
= prom_strtoul(ptr
, retptr
);
574 * We can't use a switch here because GCC *may* generate a
575 * jump table which won't work, because we're not running at
576 * the address we're linked at.
578 if ('G' == **retptr
|| 'g' == **retptr
)
581 if ('M' == **retptr
|| 'm' == **retptr
)
584 if ('K' == **retptr
|| 'k' == **retptr
)
596 * Early parsing of the command line passed to the kernel, used for
597 * "mem=x" and the options that affect the iommu
599 static void __init
early_cmdline_parse(void)
601 struct prom_t
*_prom
= &RELOC(prom
);
607 RELOC(prom_cmd_line
[0]) = 0;
608 p
= RELOC(prom_cmd_line
);
609 if ((long)_prom
->chosen
> 0)
610 l
= prom_getprop(_prom
->chosen
, "bootargs", p
, COMMAND_LINE_SIZE
-1);
611 #ifdef CONFIG_CMDLINE
612 if (l
<= 0 || p
[0] == '\0') /* dbl check */
613 strlcpy(RELOC(prom_cmd_line
),
614 RELOC(CONFIG_CMDLINE
), sizeof(prom_cmd_line
));
615 #endif /* CONFIG_CMDLINE */
616 prom_printf("command line: %s\n", RELOC(prom_cmd_line
));
619 opt
= strstr(RELOC(prom_cmd_line
), RELOC("iommu="));
621 prom_printf("iommu opt is: %s\n", opt
);
623 while (*opt
&& *opt
== ' ')
625 if (!strncmp(opt
, RELOC("off"), 3))
626 RELOC(prom_iommu_off
) = 1;
627 else if (!strncmp(opt
, RELOC("force"), 5))
628 RELOC(prom_iommu_force_on
) = 1;
631 opt
= strstr(RELOC(prom_cmd_line
), RELOC("mem="));
634 RELOC(prom_memory_limit
) = prom_memparse(opt
, (const char **)&opt
);
636 /* Align to 16 MB == size of ppc64 large page */
637 RELOC(prom_memory_limit
) = ALIGN(RELOC(prom_memory_limit
), 0x1000000);
642 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
644 * There are two methods for telling firmware what our capabilities are.
645 * Newer machines have an "ibm,client-architecture-support" method on the
646 * root node. For older machines, we have to call the "process-elf-header"
647 * method in the /packages/elf-loader node, passing it a fake 32-bit
648 * ELF header containing a couple of PT_NOTE sections that contain
649 * structures that contain various information.
653 * New method - extensible architecture description vector.
655 * Because the description vector contains a mix of byte and word
656 * values, we declare it as an unsigned char array, and use this
657 * macro to put word values in.
659 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
660 ((x) >> 8) & 0xff, (x) & 0xff
662 /* Option vector bits - generic bits in byte 1 */
663 #define OV_IGNORE 0x80 /* ignore this vector */
664 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
666 /* Option vector 1: processor architectures supported */
667 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
668 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
669 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
670 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
671 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
672 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
673 #define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */
675 /* Option vector 2: Open Firmware options supported */
676 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
678 /* Option vector 3: processor options supported */
679 #define OV3_FP 0x80 /* floating point */
680 #define OV3_VMX 0x40 /* VMX/Altivec */
681 #define OV3_DFP 0x20 /* decimal FP */
683 /* Option vector 5: PAPR/OF options supported */
684 #define OV5_LPAR 0x80 /* logical partitioning supported */
685 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
686 /* ibm,dynamic-reconfiguration-memory property supported */
687 #define OV5_DRCONF_MEMORY 0x20
688 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
689 #define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */
690 /* PCIe/MSI support. Without MSI full PCIe is not supported */
691 #ifdef CONFIG_PCI_MSI
692 #define OV5_MSI 0x01 /* PCIe/MSI support */
695 #endif /* CONFIG_PCI_MSI */
696 #ifdef CONFIG_PPC_SMLPAR
697 #define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */
698 #define OV5_XCMO 0x40 /* Page Coalescing */
701 #define OV5_XCMO 0x00
703 #define OV5_TYPE1_AFFINITY 0x80 /* Type 1 NUMA affinity */
705 /* Option Vector 6: IBM PAPR hints */
706 #define OV6_LINUX 0x02 /* Linux is our OS */
709 * The architecture vector has an array of PVR mask/value pairs,
710 * followed by # option vectors - 1, followed by the option vectors.
712 static unsigned char ibm_architecture_vec
[] = {
713 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
714 W(0xffff0000), W(0x003e0000), /* POWER6 */
715 W(0xffff0000), W(0x003f0000), /* POWER7 */
716 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
717 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
718 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
719 6 - 1, /* 6 option vectors */
721 /* option vector 1: processor architectures supported */
723 0, /* don't ignore, don't halt */
724 OV1_PPC_2_00
| OV1_PPC_2_01
| OV1_PPC_2_02
| OV1_PPC_2_03
|
725 OV1_PPC_2_04
| OV1_PPC_2_05
| OV1_PPC_2_06
,
727 /* option vector 2: Open Firmware options supported */
731 W(0xffffffff), /* real_base */
732 W(0xffffffff), /* real_size */
733 W(0xffffffff), /* virt_base */
734 W(0xffffffff), /* virt_size */
735 W(0xffffffff), /* load_base */
736 W(256), /* 256MB min RMA */
737 W(0xffffffff), /* full client load */
738 0, /* min RMA percentage of total RAM */
739 48, /* max log_2(hash table size) */
741 /* option vector 3: processor options supported */
743 0, /* don't ignore, don't halt */
744 OV3_FP
| OV3_VMX
| OV3_DFP
,
746 /* option vector 4: IBM PAPR implementation */
750 /* option vector 5: PAPR/OF options */
752 0, /* don't ignore, don't halt */
753 OV5_LPAR
| OV5_SPLPAR
| OV5_LARGE_PAGES
| OV5_DRCONF_MEMORY
|
754 OV5_DONATE_DEDICATE_CPU
| OV5_MSI
,
761 /* WARNING: The offset of the "number of cores" field below
762 * must match by the macro below. Update the definition if
763 * the structure layout changes.
765 #define IBM_ARCH_VEC_NRCORES_OFFSET 100
766 W(NR_CPUS
), /* number of cores supported */
768 /* option vector 6: IBM PAPR hints */
776 /* Old method - ELF header with PT_NOTE sections */
777 static struct fake_elf
{
784 char name
[8]; /* "PowerPC" */
798 char name
[24]; /* "IBM,RPA-Client-Config" */
812 .e_ident
= { 0x7f, 'E', 'L', 'F',
813 ELFCLASS32
, ELFDATA2MSB
, EV_CURRENT
},
814 .e_type
= ET_EXEC
, /* yeah right */
816 .e_version
= EV_CURRENT
,
817 .e_phoff
= offsetof(struct fake_elf
, phdr
),
818 .e_phentsize
= sizeof(Elf32_Phdr
),
824 .p_offset
= offsetof(struct fake_elf
, chrpnote
),
825 .p_filesz
= sizeof(struct chrpnote
)
828 .p_offset
= offsetof(struct fake_elf
, rpanote
),
829 .p_filesz
= sizeof(struct rpanote
)
833 .namesz
= sizeof("PowerPC"),
834 .descsz
= sizeof(struct chrpdesc
),
838 .real_mode
= ~0U, /* ~0 means "don't care" */
847 .namesz
= sizeof("IBM,RPA-Client-Config"),
848 .descsz
= sizeof(struct rpadesc
),
850 .name
= "IBM,RPA-Client-Config",
853 .min_rmo_size
= 64, /* in megabytes */
854 .min_rmo_percent
= 0,
855 .max_pft_size
= 48, /* 2^48 bytes max PFT size */
863 static int __init
prom_count_smt_threads(void)
869 /* Pick up th first CPU node we can find */
870 for (node
= 0; prom_next_node(&node
); ) {
872 prom_getprop(node
, "device_type", type
, sizeof(type
));
874 if (strcmp(type
, RELOC("cpu")))
877 * There is an entry for each smt thread, each entry being
878 * 4 bytes long. All cpus should have the same number of
879 * smt threads, so return after finding the first.
881 plen
= prom_getproplen(node
, "ibm,ppc-interrupt-server#s");
882 if (plen
== PROM_ERROR
)
885 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen
);
888 if (plen
< 1 || plen
> 64) {
889 prom_printf("Threads per core %lu out of bounds, assuming 1\n",
890 (unsigned long)plen
);
895 prom_debug("No threads found, assuming 1 per core\n");
902 static void __init
prom_send_capabilities(void)
904 ihandle elfloader
, root
;
908 root
= call_prom("open", 1, 1, ADDR("/"));
910 /* We need to tell the FW about the number of cores we support.
912 * To do that, we count the number of threads on the first core
913 * (we assume this is the same for all cores) and use it to
916 cores
= (u32
*)PTRRELOC(&ibm_architecture_vec
[IBM_ARCH_VEC_NRCORES_OFFSET
]);
917 if (*cores
!= NR_CPUS
) {
918 prom_printf("WARNING ! "
919 "ibm_architecture_vec structure inconsistent: %lu!\n",
922 *cores
= DIV_ROUND_UP(NR_CPUS
, prom_count_smt_threads());
923 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n",
927 /* try calling the ibm,client-architecture-support method */
928 prom_printf("Calling ibm,client-architecture-support...");
929 if (call_prom_ret("call-method", 3, 2, &ret
,
930 ADDR("ibm,client-architecture-support"),
932 ADDR(ibm_architecture_vec
)) == 0) {
933 /* the call exists... */
935 prom_printf("\nWARNING: ibm,client-architecture"
936 "-support call FAILED!\n");
937 call_prom("close", 1, 0, root
);
938 prom_printf(" done\n");
941 call_prom("close", 1, 0, root
);
942 prom_printf(" not implemented\n");
945 /* no ibm,client-architecture-support call, try the old way */
946 elfloader
= call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
947 if (elfloader
== 0) {
948 prom_printf("couldn't open /packages/elf-loader\n");
951 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
952 elfloader
, ADDR(&fake_elf
));
953 call_prom("close", 1, 0, elfloader
);
958 * Memory allocation strategy... our layout is normally:
960 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
961 * rare cases, initrd might end up being before the kernel though.
962 * We assume this won't override the final kernel at 0, we have no
963 * provision to handle that in this version, but it should hopefully
966 * alloc_top is set to the top of RMO, eventually shrink down if the
969 * alloc_bottom is set to the top of kernel/initrd
971 * from there, allocations are done this way : rtas is allocated
972 * topmost, and the device-tree is allocated from the bottom. We try
973 * to grow the device-tree allocation as we progress. If we can't,
974 * then we fail, we don't currently have a facility to restart
975 * elsewhere, but that shouldn't be necessary.
977 * Note that calls to reserve_mem have to be done explicitly, memory
978 * allocated with either alloc_up or alloc_down isn't automatically
984 * Allocates memory in the RMO upward from the kernel/initrd
986 * When align is 0, this is a special case, it means to allocate in place
987 * at the current location of alloc_bottom or fail (that is basically
988 * extending the previous allocation). Used for the device-tree flattening
990 static unsigned long __init
alloc_up(unsigned long size
, unsigned long align
)
992 unsigned long base
= RELOC(alloc_bottom
);
993 unsigned long addr
= 0;
996 base
= _ALIGN_UP(base
, align
);
997 prom_debug("alloc_up(%x, %x)\n", size
, align
);
998 if (RELOC(ram_top
) == 0)
999 prom_panic("alloc_up() called with mem not initialized\n");
1002 base
= _ALIGN_UP(RELOC(alloc_bottom
), align
);
1004 base
= RELOC(alloc_bottom
);
1006 for(; (base
+ size
) <= RELOC(alloc_top
);
1007 base
= _ALIGN_UP(base
+ 0x100000, align
)) {
1008 prom_debug(" trying: 0x%x\n\r", base
);
1009 addr
= (unsigned long)prom_claim(base
, size
, 0);
1010 if (addr
!= PROM_ERROR
&& addr
!= 0)
1018 RELOC(alloc_bottom
) = addr
+ size
;
1020 prom_debug(" -> %x\n", addr
);
1021 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
1022 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
1023 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
1024 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
1025 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
1031 * Allocates memory downward, either from top of RMO, or if highmem
1032 * is set, from the top of RAM. Note that this one doesn't handle
1033 * failures. It does claim memory if highmem is not set.
1035 static unsigned long __init
alloc_down(unsigned long size
, unsigned long align
,
1038 unsigned long base
, addr
= 0;
1040 prom_debug("alloc_down(%x, %x, %s)\n", size
, align
,
1041 highmem
? RELOC("(high)") : RELOC("(low)"));
1042 if (RELOC(ram_top
) == 0)
1043 prom_panic("alloc_down() called with mem not initialized\n");
1046 /* Carve out storage for the TCE table. */
1047 addr
= _ALIGN_DOWN(RELOC(alloc_top_high
) - size
, align
);
1048 if (addr
<= RELOC(alloc_bottom
))
1050 /* Will we bump into the RMO ? If yes, check out that we
1051 * didn't overlap existing allocations there, if we did,
1052 * we are dead, we must be the first in town !
1054 if (addr
< RELOC(rmo_top
)) {
1055 /* Good, we are first */
1056 if (RELOC(alloc_top
) == RELOC(rmo_top
))
1057 RELOC(alloc_top
) = RELOC(rmo_top
) = addr
;
1061 RELOC(alloc_top_high
) = addr
;
1065 base
= _ALIGN_DOWN(RELOC(alloc_top
) - size
, align
);
1066 for (; base
> RELOC(alloc_bottom
);
1067 base
= _ALIGN_DOWN(base
- 0x100000, align
)) {
1068 prom_debug(" trying: 0x%x\n\r", base
);
1069 addr
= (unsigned long)prom_claim(base
, size
, 0);
1070 if (addr
!= PROM_ERROR
&& addr
!= 0)
1076 RELOC(alloc_top
) = addr
;
1079 prom_debug(" -> %x\n", addr
);
1080 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
1081 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
1082 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
1083 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
1084 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
1090 * Parse a "reg" cell
1092 static unsigned long __init
prom_next_cell(int s
, cell_t
**cellp
)
1095 unsigned long r
= 0;
1097 /* Ignore more than 2 cells */
1098 while (s
> sizeof(unsigned long) / 4) {
1114 * Very dumb function for adding to the memory reserve list, but
1115 * we don't need anything smarter at this point
1117 * XXX Eventually check for collisions. They should NEVER happen.
1118 * If problems seem to show up, it would be a good start to track
1121 static void __init
reserve_mem(u64 base
, u64 size
)
1123 u64 top
= base
+ size
;
1124 unsigned long cnt
= RELOC(mem_reserve_cnt
);
1129 /* We need to always keep one empty entry so that we
1130 * have our terminator with "size" set to 0 since we are
1131 * dumb and just copy this entire array to the boot params
1133 base
= _ALIGN_DOWN(base
, PAGE_SIZE
);
1134 top
= _ALIGN_UP(top
, PAGE_SIZE
);
1137 if (cnt
>= (MEM_RESERVE_MAP_SIZE
- 1))
1138 prom_panic("Memory reserve map exhausted !\n");
1139 RELOC(mem_reserve_map
)[cnt
].base
= base
;
1140 RELOC(mem_reserve_map
)[cnt
].size
= size
;
1141 RELOC(mem_reserve_cnt
) = cnt
+ 1;
1145 * Initialize memory allocation mechanism, parse "memory" nodes and
1146 * obtain that way the top of memory and RMO to setup out local allocator
1148 static void __init
prom_init_mem(void)
1151 char *path
, type
[64];
1154 struct prom_t
*_prom
= &RELOC(prom
);
1158 * We iterate the memory nodes to find
1159 * 1) top of RMO (first node)
1163 prom_getprop(_prom
->root
, "#address-cells", &rac
, sizeof(rac
));
1165 prom_getprop(_prom
->root
, "#size-cells", &rsc
, sizeof(rsc
));
1166 prom_debug("root_addr_cells: %x\n", (unsigned long) rac
);
1167 prom_debug("root_size_cells: %x\n", (unsigned long) rsc
);
1169 prom_debug("scanning memory:\n");
1170 path
= RELOC(prom_scratch
);
1172 for (node
= 0; prom_next_node(&node
); ) {
1174 prom_getprop(node
, "device_type", type
, sizeof(type
));
1178 * CHRP Longtrail machines have no device_type
1179 * on the memory node, so check the name instead...
1181 prom_getprop(node
, "name", type
, sizeof(type
));
1183 if (strcmp(type
, RELOC("memory")))
1186 plen
= prom_getprop(node
, "reg", RELOC(regbuf
), sizeof(regbuf
));
1187 if (plen
> sizeof(regbuf
)) {
1188 prom_printf("memory node too large for buffer !\n");
1189 plen
= sizeof(regbuf
);
1192 endp
= p
+ (plen
/ sizeof(cell_t
));
1195 memset(path
, 0, PROM_SCRATCH_SIZE
);
1196 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1197 prom_debug(" node %s :\n", path
);
1198 #endif /* DEBUG_PROM */
1200 while ((endp
- p
) >= (rac
+ rsc
)) {
1201 unsigned long base
, size
;
1203 base
= prom_next_cell(rac
, &p
);
1204 size
= prom_next_cell(rsc
, &p
);
1208 prom_debug(" %x %x\n", base
, size
);
1209 if (base
== 0 && (RELOC(of_platform
) & PLATFORM_LPAR
))
1210 RELOC(rmo_top
) = size
;
1211 if ((base
+ size
) > RELOC(ram_top
))
1212 RELOC(ram_top
) = base
+ size
;
1216 RELOC(alloc_bottom
) = PAGE_ALIGN((unsigned long)&RELOC(_end
) + 0x4000);
1219 * If prom_memory_limit is set we reduce the upper limits *except* for
1220 * alloc_top_high. This must be the real top of RAM so we can put
1224 RELOC(alloc_top_high
) = RELOC(ram_top
);
1226 if (RELOC(prom_memory_limit
)) {
1227 if (RELOC(prom_memory_limit
) <= RELOC(alloc_bottom
)) {
1228 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1229 RELOC(prom_memory_limit
));
1230 RELOC(prom_memory_limit
) = 0;
1231 } else if (RELOC(prom_memory_limit
) >= RELOC(ram_top
)) {
1232 prom_printf("Ignoring mem=%x >= ram_top.\n",
1233 RELOC(prom_memory_limit
));
1234 RELOC(prom_memory_limit
) = 0;
1236 RELOC(ram_top
) = RELOC(prom_memory_limit
);
1237 RELOC(rmo_top
) = min(RELOC(rmo_top
), RELOC(prom_memory_limit
));
1242 * Setup our top alloc point, that is top of RMO or top of
1243 * segment 0 when running non-LPAR.
1244 * Some RS64 machines have buggy firmware where claims up at
1245 * 1GB fail. Cap at 768MB as a workaround.
1246 * Since 768MB is plenty of room, and we need to cap to something
1247 * reasonable on 32-bit, cap at 768MB on all machines.
1249 if (!RELOC(rmo_top
))
1250 RELOC(rmo_top
) = RELOC(ram_top
);
1251 RELOC(rmo_top
) = min(0x30000000ul
, RELOC(rmo_top
));
1252 RELOC(alloc_top
) = RELOC(rmo_top
);
1253 RELOC(alloc_top_high
) = RELOC(ram_top
);
1256 * Check if we have an initrd after the kernel but still inside
1257 * the RMO. If we do move our bottom point to after it.
1259 if (RELOC(prom_initrd_start
) &&
1260 RELOC(prom_initrd_start
) < RELOC(rmo_top
) &&
1261 RELOC(prom_initrd_end
) > RELOC(alloc_bottom
))
1262 RELOC(alloc_bottom
) = PAGE_ALIGN(RELOC(prom_initrd_end
));
1264 prom_printf("memory layout at init:\n");
1265 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit
));
1266 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
1267 prom_printf(" alloc_top : %x\n", RELOC(alloc_top
));
1268 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
1269 prom_printf(" rmo_top : %x\n", RELOC(rmo_top
));
1270 prom_printf(" ram_top : %x\n", RELOC(ram_top
));
1273 static void __init
prom_close_stdin(void)
1275 struct prom_t
*_prom
= &RELOC(prom
);
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 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(&RELOC(prom_opal_size
),
1320 &RELOC(prom_opal_align
));
1321 prom_debug("(rc = %ld) ", rc
);
1323 prom_printf("not there.\n");
1326 RELOC(of_platform
) = PLATFORM_OPAL
;
1327 prom_printf(" there !\n");
1328 prom_debug(" opal_size = 0x%lx\n", RELOC(prom_opal_size
));
1329 prom_debug(" opal_align = 0x%lx\n", RELOC(prom_opal_align
));
1330 if (RELOC(prom_opal_align
) < 0x10000)
1331 RELOC(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
, RELOC(prom_rtas_data
),
1353 RELOC(prom_rtas_entry
));
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 struct prom_t
*_prom
= &RELOC(prom
);
1369 void *entry
= (unsigned long *)&RELOC(opal_secondary_entry
);
1370 struct opal_secondary_data
*data
= &RELOC(opal_secondary_data
);
1372 prom_debug("prom_opal_hold_cpus: start...\n");
1373 prom_debug(" - entry = 0x%x\n", entry
);
1374 prom_debug(" - data = 0x%x\n", data
);
1380 for (node
= 0; prom_next_node(&node
); ) {
1382 prom_getprop(node
, "device_type", type
, sizeof(type
));
1383 if (strcmp(type
, RELOC("cpu")) != 0)
1386 /* Skip non-configured cpus. */
1387 if (prom_getprop(node
, "status", type
, sizeof(type
)) > 0)
1388 if (strcmp(type
, RELOC("okay")) != 0)
1391 cnt
= prom_getprop(node
, "ibm,ppc-interrupt-server#s", servers
,
1393 if (cnt
== PROM_ERROR
)
1396 for (i
= 0; i
< cnt
; i
++) {
1398 prom_debug("CPU %d ... ", cpu
);
1399 if (cpu
== _prom
->cpu
) {
1400 prom_debug("booted !\n");
1403 prom_debug("starting ... ");
1405 /* Init the acknowledge var which will be reset by
1406 * the secondary cpu when it awakens from its OF
1410 rc
= prom_rtas_call(RELOC(prom_rtas_start_cpu
), 3, 1,
1411 NULL
, cpu
, entry
, data
);
1412 prom_debug("rtas rc=%d ...", rc
);
1414 for (j
= 0; j
< 100000000 && data
->ack
== -1; j
++) {
1419 if (data
->ack
!= -1)
1420 prom_debug("done, PIR=0x%x\n", data
->ack
);
1422 prom_debug("timeout !\n");
1425 prom_debug("prom_opal_hold_cpus: end...\n");
1428 static void prom_opal_takeover(void)
1430 struct opal_secondary_data
*data
= &RELOC(opal_secondary_data
);
1431 struct opal_takeover_args
*args
= &data
->args
;
1432 u64 align
= RELOC(prom_opal_align
);
1433 u64 top_addr
, opal_addr
;
1435 args
->k_image
= (u64
)RELOC(_stext
);
1436 args
->k_size
= _end
- _stext
;
1438 args
->k_entry2
= 0x60;
1440 top_addr
= _ALIGN_UP(args
->k_size
, align
);
1442 if (RELOC(prom_initrd_start
) != 0) {
1443 args
->rd_image
= RELOC(prom_initrd_start
);
1444 args
->rd_size
= RELOC(prom_initrd_end
) - args
->rd_image
;
1445 args
->rd_loc
= top_addr
;
1446 top_addr
= _ALIGN_UP(args
->rd_loc
+ args
->rd_size
, align
);
1449 /* Pickup an address for the HAL. We want to go really high
1450 * up to avoid problem with future kexecs. On the other hand
1451 * we don't want to be all over the TCEs on P5IOC2 machines
1452 * which are going to be up there too. We assume the machine
1453 * has plenty of memory, and we ask for the HAL for now to
1454 * be just below the 1G point, or above the initrd
1456 opal_addr
= _ALIGN_DOWN(0x40000000 - RELOC(prom_opal_size
), align
);
1457 if (opal_addr
< top_addr
)
1458 opal_addr
= top_addr
;
1459 args
->hal_addr
= opal_addr
;
1461 /* Copy the command line to the kernel image */
1462 strlcpy(RELOC(boot_command_line
), RELOC(prom_cmd_line
),
1465 prom_debug(" k_image = 0x%lx\n", args
->k_image
);
1466 prom_debug(" k_size = 0x%lx\n", args
->k_size
);
1467 prom_debug(" k_entry = 0x%lx\n", args
->k_entry
);
1468 prom_debug(" k_entry2 = 0x%lx\n", args
->k_entry2
);
1469 prom_debug(" hal_addr = 0x%lx\n", args
->hal_addr
);
1470 prom_debug(" rd_image = 0x%lx\n", args
->rd_image
);
1471 prom_debug(" rd_size = 0x%lx\n", args
->rd_size
);
1472 prom_debug(" rd_loc = 0x%lx\n", args
->rd_loc
);
1473 prom_printf("Performing OPAL takeover,this can take a few minutes..\n");
1478 opal_do_takeover(args
);
1482 * Allocate room for and instantiate OPAL
1484 static void __init
prom_instantiate_opal(void)
1489 u64 size
= 0, align
= 0x10000;
1492 prom_debug("prom_instantiate_opal: start...\n");
1494 opal_node
= call_prom("finddevice", 1, 1, ADDR("/ibm,opal"));
1495 prom_debug("opal_node: %x\n", opal_node
);
1496 if (!PHANDLE_VALID(opal_node
))
1499 prom_getprop(opal_node
, "opal-runtime-size", &size
, sizeof(size
));
1502 prom_getprop(opal_node
, "opal-runtime-alignment", &align
,
1505 base
= alloc_down(size
, align
, 0);
1507 prom_printf("OPAL allocation failed !\n");
1511 opal_inst
= call_prom("open", 1, 1, ADDR("/ibm,opal"));
1512 if (!IHANDLE_VALID(opal_inst
)) {
1513 prom_printf("opening opal package failed (%x)\n", opal_inst
);
1517 prom_printf("instantiating opal at 0x%x...", base
);
1519 if (call_prom_ret("call-method", 4, 3, rets
,
1520 ADDR("load-opal-runtime"),
1522 base
>> 32, base
& 0xffffffff) != 0
1523 || (rets
[0] == 0 && rets
[1] == 0)) {
1524 prom_printf(" failed\n");
1527 entry
= (((u64
)rets
[0]) << 32) | rets
[1];
1529 prom_printf(" done\n");
1531 reserve_mem(base
, size
);
1533 prom_debug("opal base = 0x%x\n", base
);
1534 prom_debug("opal align = 0x%x\n", align
);
1535 prom_debug("opal entry = 0x%x\n", entry
);
1536 prom_debug("opal size = 0x%x\n", (long)size
);
1538 prom_setprop(opal_node
, "/ibm,opal", "opal-base-address",
1539 &base
, sizeof(base
));
1540 prom_setprop(opal_node
, "/ibm,opal", "opal-entry-address",
1541 &entry
, sizeof(entry
));
1543 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
1544 RELOC(prom_opal_base
) = base
;
1545 RELOC(prom_opal_entry
) = entry
;
1547 prom_debug("prom_instantiate_opal: end...\n");
1550 #endif /* CONFIG_PPC_POWERNV */
1553 * Allocate room for and instantiate RTAS
1555 static void __init
prom_instantiate_rtas(void)
1559 u32 base
, entry
= 0;
1562 prom_debug("prom_instantiate_rtas: start...\n");
1564 rtas_node
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1565 prom_debug("rtas_node: %x\n", rtas_node
);
1566 if (!PHANDLE_VALID(rtas_node
))
1569 prom_getprop(rtas_node
, "rtas-size", &size
, sizeof(size
));
1573 base
= alloc_down(size
, PAGE_SIZE
, 0);
1575 prom_panic("Could not allocate memory for RTAS\n");
1577 rtas_inst
= call_prom("open", 1, 1, ADDR("/rtas"));
1578 if (!IHANDLE_VALID(rtas_inst
)) {
1579 prom_printf("opening rtas package failed (%x)\n", rtas_inst
);
1583 prom_printf("instantiating rtas at 0x%x...", base
);
1585 if (call_prom_ret("call-method", 3, 2, &entry
,
1586 ADDR("instantiate-rtas"),
1587 rtas_inst
, base
) != 0
1589 prom_printf(" failed\n");
1592 prom_printf(" done\n");
1594 reserve_mem(base
, size
);
1596 prom_setprop(rtas_node
, "/rtas", "linux,rtas-base",
1597 &base
, sizeof(base
));
1598 prom_setprop(rtas_node
, "/rtas", "linux,rtas-entry",
1599 &entry
, sizeof(entry
));
1601 #ifdef CONFIG_PPC_POWERNV
1602 /* PowerVN takeover hack */
1603 RELOC(prom_rtas_data
) = base
;
1604 RELOC(prom_rtas_entry
) = entry
;
1605 prom_getprop(rtas_node
, "start-cpu", &RELOC(prom_rtas_start_cpu
), 4);
1607 prom_debug("rtas base = 0x%x\n", base
);
1608 prom_debug("rtas entry = 0x%x\n", entry
);
1609 prom_debug("rtas size = 0x%x\n", (long)size
);
1611 prom_debug("prom_instantiate_rtas: end...\n");
1616 * Allocate room for and initialize TCE tables
1618 static void __init
prom_initialize_tce_table(void)
1622 char compatible
[64], type
[64], model
[64];
1623 char *path
= RELOC(prom_scratch
);
1625 u32 minalign
, minsize
;
1626 u64 tce_entry
, *tce_entryp
;
1627 u64 local_alloc_top
, local_alloc_bottom
;
1630 if (RELOC(prom_iommu_off
))
1633 prom_debug("starting prom_initialize_tce_table\n");
1635 /* Cache current top of allocs so we reserve a single block */
1636 local_alloc_top
= RELOC(alloc_top_high
);
1637 local_alloc_bottom
= local_alloc_top
;
1639 /* Search all nodes looking for PHBs. */
1640 for (node
= 0; prom_next_node(&node
); ) {
1644 prom_getprop(node
, "compatible",
1645 compatible
, sizeof(compatible
));
1646 prom_getprop(node
, "device_type", type
, sizeof(type
));
1647 prom_getprop(node
, "model", model
, sizeof(model
));
1649 if ((type
[0] == 0) || (strstr(type
, RELOC("pci")) == NULL
))
1652 /* Keep the old logic intact to avoid regression. */
1653 if (compatible
[0] != 0) {
1654 if ((strstr(compatible
, RELOC("python")) == NULL
) &&
1655 (strstr(compatible
, RELOC("Speedwagon")) == NULL
) &&
1656 (strstr(compatible
, RELOC("Winnipeg")) == NULL
))
1658 } else if (model
[0] != 0) {
1659 if ((strstr(model
, RELOC("ython")) == NULL
) &&
1660 (strstr(model
, RELOC("peedwagon")) == NULL
) &&
1661 (strstr(model
, RELOC("innipeg")) == NULL
))
1665 if (prom_getprop(node
, "tce-table-minalign", &minalign
,
1666 sizeof(minalign
)) == PROM_ERROR
)
1668 if (prom_getprop(node
, "tce-table-minsize", &minsize
,
1669 sizeof(minsize
)) == PROM_ERROR
)
1670 minsize
= 4UL << 20;
1673 * Even though we read what OF wants, we just set the table
1674 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1675 * By doing this, we avoid the pitfalls of trying to DMA to
1676 * MMIO space and the DMA alias hole.
1678 * On POWER4, firmware sets the TCE region by assuming
1679 * each TCE table is 8MB. Using this memory for anything
1680 * else will impact performance, so we always allocate 8MB.
1683 if (__is_processor(PV_POWER4
) || __is_processor(PV_POWER4p
))
1684 minsize
= 8UL << 20;
1686 minsize
= 4UL << 20;
1688 /* Align to the greater of the align or size */
1689 align
= max(minalign
, minsize
);
1690 base
= alloc_down(minsize
, align
, 1);
1692 prom_panic("ERROR, cannot find space for TCE table.\n");
1693 if (base
< local_alloc_bottom
)
1694 local_alloc_bottom
= base
;
1696 /* It seems OF doesn't null-terminate the path :-( */
1697 memset(path
, 0, PROM_SCRATCH_SIZE
);
1698 /* Call OF to setup the TCE hardware */
1699 if (call_prom("package-to-path", 3, 1, node
,
1700 path
, PROM_SCRATCH_SIZE
-1) == PROM_ERROR
) {
1701 prom_printf("package-to-path failed\n");
1704 /* Save away the TCE table attributes for later use. */
1705 prom_setprop(node
, path
, "linux,tce-base", &base
, sizeof(base
));
1706 prom_setprop(node
, path
, "linux,tce-size", &minsize
, sizeof(minsize
));
1708 prom_debug("TCE table: %s\n", path
);
1709 prom_debug("\tnode = 0x%x\n", node
);
1710 prom_debug("\tbase = 0x%x\n", base
);
1711 prom_debug("\tsize = 0x%x\n", minsize
);
1713 /* Initialize the table to have a one-to-one mapping
1714 * over the allocated size.
1716 tce_entryp
= (u64
*)base
;
1717 for (i
= 0; i
< (minsize
>> 3) ;tce_entryp
++, i
++) {
1718 tce_entry
= (i
<< PAGE_SHIFT
);
1720 *tce_entryp
= tce_entry
;
1723 prom_printf("opening PHB %s", path
);
1724 phb_node
= call_prom("open", 1, 1, path
);
1726 prom_printf("... failed\n");
1728 prom_printf("... done\n");
1730 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1731 phb_node
, -1, minsize
,
1732 (u32
) base
, (u32
) (base
>> 32));
1733 call_prom("close", 1, 0, phb_node
);
1736 reserve_mem(local_alloc_bottom
, local_alloc_top
- local_alloc_bottom
);
1738 /* These are only really needed if there is a memory limit in
1739 * effect, but we don't know so export them always. */
1740 RELOC(prom_tce_alloc_start
) = local_alloc_bottom
;
1741 RELOC(prom_tce_alloc_end
) = local_alloc_top
;
1743 /* Flag the first invalid entry */
1744 prom_debug("ending prom_initialize_tce_table\n");
1749 * With CHRP SMP we need to use the OF to start the other processors.
1750 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1751 * so we have to put the processors into a holding pattern controlled
1752 * by the kernel (not OF) before we destroy the OF.
1754 * This uses a chunk of low memory, puts some holding pattern
1755 * code there and sends the other processors off to there until
1756 * smp_boot_cpus tells them to do something. The holding pattern
1757 * checks that address until its cpu # is there, when it is that
1758 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1759 * of setting those values.
1761 * We also use physical address 0x4 here to tell when a cpu
1762 * is in its holding pattern code.
1767 * We want to reference the copy of __secondary_hold_* in the
1768 * 0 - 0x100 address range
1770 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1772 static void __init
prom_hold_cpus(void)
1778 struct prom_t
*_prom
= &RELOC(prom
);
1779 unsigned long *spinloop
1780 = (void *) LOW_ADDR(__secondary_hold_spinloop
);
1781 unsigned long *acknowledge
1782 = (void *) LOW_ADDR(__secondary_hold_acknowledge
);
1783 unsigned long secondary_hold
= LOW_ADDR(__secondary_hold
);
1785 prom_debug("prom_hold_cpus: start...\n");
1786 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop
);
1787 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop
);
1788 prom_debug(" 1) acknowledge = 0x%x\n",
1789 (unsigned long)acknowledge
);
1790 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge
);
1791 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold
);
1793 /* Set the common spinloop variable, so all of the secondary cpus
1794 * will block when they are awakened from their OF spinloop.
1795 * This must occur for both SMP and non SMP kernels, since OF will
1796 * be trashed when we move the kernel.
1801 for (node
= 0; prom_next_node(&node
); ) {
1803 prom_getprop(node
, "device_type", type
, sizeof(type
));
1804 if (strcmp(type
, RELOC("cpu")) != 0)
1807 /* Skip non-configured cpus. */
1808 if (prom_getprop(node
, "status", type
, sizeof(type
)) > 0)
1809 if (strcmp(type
, RELOC("okay")) != 0)
1813 prom_getprop(node
, "reg", ®
, sizeof(reg
));
1815 prom_debug("cpu hw idx = %lu\n", reg
);
1817 /* Init the acknowledge var which will be reset by
1818 * the secondary cpu when it awakens from its OF
1821 *acknowledge
= (unsigned long)-1;
1823 if (reg
!= _prom
->cpu
) {
1824 /* Primary Thread of non-boot cpu or any thread */
1825 prom_printf("starting cpu hw idx %lu... ", reg
);
1826 call_prom("start-cpu", 3, 0, node
,
1827 secondary_hold
, reg
);
1829 for (i
= 0; (i
< 100000000) &&
1830 (*acknowledge
== ((unsigned long)-1)); i
++ )
1833 if (*acknowledge
== reg
)
1834 prom_printf("done\n");
1836 prom_printf("failed: %x\n", *acknowledge
);
1840 prom_printf("boot cpu hw idx %lu\n", reg
);
1841 #endif /* CONFIG_SMP */
1844 prom_debug("prom_hold_cpus: end...\n");
1848 static void __init
prom_init_client_services(unsigned long pp
)
1850 struct prom_t
*_prom
= &RELOC(prom
);
1852 /* Get a handle to the prom entry point before anything else */
1853 RELOC(prom_entry
) = pp
;
1855 /* get a handle for the stdout device */
1856 _prom
->chosen
= call_prom("finddevice", 1, 1, ADDR("/chosen"));
1857 if (!PHANDLE_VALID(_prom
->chosen
))
1858 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1860 /* get device tree root */
1861 _prom
->root
= call_prom("finddevice", 1, 1, ADDR("/"));
1862 if (!PHANDLE_VALID(_prom
->root
))
1863 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1870 * For really old powermacs, we need to map things we claim.
1871 * For that, we need the ihandle of the mmu.
1872 * Also, on the longtrail, we need to work around other bugs.
1874 static void __init
prom_find_mmu(void)
1876 struct prom_t
*_prom
= &RELOC(prom
);
1880 oprom
= call_prom("finddevice", 1, 1, ADDR("/openprom"));
1881 if (!PHANDLE_VALID(oprom
))
1883 if (prom_getprop(oprom
, "model", version
, sizeof(version
)) <= 0)
1885 version
[sizeof(version
) - 1] = 0;
1886 /* XXX might need to add other versions here */
1887 if (strcmp(version
, "Open Firmware, 1.0.5") == 0)
1888 of_workarounds
= OF_WA_CLAIM
;
1889 else if (strncmp(version
, "FirmWorks,3.", 12) == 0) {
1890 of_workarounds
= OF_WA_CLAIM
| OF_WA_LONGTRAIL
;
1891 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1894 _prom
->memory
= call_prom("open", 1, 1, ADDR("/memory"));
1895 prom_getprop(_prom
->chosen
, "mmu", &_prom
->mmumap
,
1896 sizeof(_prom
->mmumap
));
1897 if (!IHANDLE_VALID(_prom
->memory
) || !IHANDLE_VALID(_prom
->mmumap
))
1898 of_workarounds
&= ~OF_WA_CLAIM
; /* hmmm */
1901 #define prom_find_mmu()
1904 static void __init
prom_init_stdout(void)
1906 struct prom_t
*_prom
= &RELOC(prom
);
1907 char *path
= RELOC(of_stdout_device
);
1911 if (prom_getprop(_prom
->chosen
, "stdout", &val
, sizeof(val
)) <= 0)
1912 prom_panic("cannot find stdout");
1914 _prom
->stdout
= val
;
1916 /* Get the full OF pathname of the stdout device */
1917 memset(path
, 0, 256);
1918 call_prom("instance-to-path", 3, 1, _prom
->stdout
, path
, 255);
1919 val
= call_prom("instance-to-package", 1, 1, _prom
->stdout
);
1920 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-package",
1922 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device
));
1923 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-path",
1924 path
, strlen(path
) + 1);
1926 /* If it's a display, note it */
1927 memset(type
, 0, sizeof(type
));
1928 prom_getprop(val
, "device_type", type
, sizeof(type
));
1929 if (strcmp(type
, RELOC("display")) == 0)
1930 prom_setprop(val
, path
, "linux,boot-display", NULL
, 0);
1933 static int __init
prom_find_machine_type(void)
1935 struct prom_t
*_prom
= &RELOC(prom
);
1943 /* Look for a PowerMac or a Cell */
1944 len
= prom_getprop(_prom
->root
, "compatible",
1945 compat
, sizeof(compat
)-1);
1949 char *p
= &compat
[i
];
1953 if (strstr(p
, RELOC("Power Macintosh")) ||
1954 strstr(p
, RELOC("MacRISC")))
1955 return PLATFORM_POWERMAC
;
1957 /* We must make sure we don't detect the IBM Cell
1958 * blades as pSeries due to some firmware issues,
1961 if (strstr(p
, RELOC("IBM,CBEA")) ||
1962 strstr(p
, RELOC("IBM,CPBW-1.0")))
1963 return PLATFORM_GENERIC
;
1964 #endif /* CONFIG_PPC64 */
1969 /* Try to detect OPAL */
1970 if (PHANDLE_VALID(call_prom("finddevice", 1, 1, ADDR("/ibm,opal"))))
1971 return PLATFORM_OPAL
;
1973 /* Try to figure out if it's an IBM pSeries or any other
1974 * PAPR compliant platform. We assume it is if :
1975 * - /device_type is "chrp" (please, do NOT use that for future
1979 len
= prom_getprop(_prom
->root
, "device_type",
1980 compat
, sizeof(compat
)-1);
1982 return PLATFORM_GENERIC
;
1983 if (strcmp(compat
, RELOC("chrp")))
1984 return PLATFORM_GENERIC
;
1986 /* Default to pSeries. We need to know if we are running LPAR */
1987 rtas
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1988 if (!PHANDLE_VALID(rtas
))
1989 return PLATFORM_GENERIC
;
1990 x
= prom_getproplen(rtas
, "ibm,hypertas-functions");
1991 if (x
!= PROM_ERROR
) {
1992 prom_debug("Hypertas detected, assuming LPAR !\n");
1993 return PLATFORM_PSERIES_LPAR
;
1995 return PLATFORM_PSERIES
;
1997 return PLATFORM_GENERIC
;
2001 static int __init
prom_set_color(ihandle ih
, int i
, int r
, int g
, int b
)
2003 return call_prom("call-method", 6, 1, ADDR("color!"), ih
, i
, b
, g
, r
);
2007 * If we have a display that we don't know how to drive,
2008 * we will want to try to execute OF's open method for it
2009 * later. However, OF will probably fall over if we do that
2010 * we've taken over the MMU.
2011 * So we check whether we will need to open the display,
2012 * and if so, open it now.
2014 static void __init
prom_check_displays(void)
2016 char type
[16], *path
;
2021 static unsigned char default_colors
[] = {
2039 const unsigned char *clut
;
2041 prom_debug("Looking for displays\n");
2042 for (node
= 0; prom_next_node(&node
); ) {
2043 memset(type
, 0, sizeof(type
));
2044 prom_getprop(node
, "device_type", type
, sizeof(type
));
2045 if (strcmp(type
, RELOC("display")) != 0)
2048 /* It seems OF doesn't null-terminate the path :-( */
2049 path
= RELOC(prom_scratch
);
2050 memset(path
, 0, PROM_SCRATCH_SIZE
);
2053 * leave some room at the end of the path for appending extra
2056 if (call_prom("package-to-path", 3, 1, node
, path
,
2057 PROM_SCRATCH_SIZE
-10) == PROM_ERROR
)
2059 prom_printf("found display : %s, opening... ", path
);
2061 ih
= call_prom("open", 1, 1, path
);
2063 prom_printf("failed\n");
2068 prom_printf("done\n");
2069 prom_setprop(node
, path
, "linux,opened", NULL
, 0);
2071 /* Setup a usable color table when the appropriate
2072 * method is available. Should update this to set-colors */
2073 clut
= RELOC(default_colors
);
2074 for (i
= 0; i
< 16; i
++, clut
+= 3)
2075 if (prom_set_color(ih
, i
, clut
[0], clut
[1],
2079 #ifdef CONFIG_LOGO_LINUX_CLUT224
2080 clut
= PTRRELOC(RELOC(logo_linux_clut224
.clut
));
2081 for (i
= 0; i
< RELOC(logo_linux_clut224
.clutsize
); i
++, clut
+= 3)
2082 if (prom_set_color(ih
, i
+ 32, clut
[0], clut
[1],
2085 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
2090 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
2091 static void __init
*make_room(unsigned long *mem_start
, unsigned long *mem_end
,
2092 unsigned long needed
, unsigned long align
)
2096 *mem_start
= _ALIGN(*mem_start
, align
);
2097 while ((*mem_start
+ needed
) > *mem_end
) {
2098 unsigned long room
, chunk
;
2100 prom_debug("Chunk exhausted, claiming more at %x...\n",
2101 RELOC(alloc_bottom
));
2102 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
);
2103 if (room
> DEVTREE_CHUNK_SIZE
)
2104 room
= DEVTREE_CHUNK_SIZE
;
2105 if (room
< PAGE_SIZE
)
2106 prom_panic("No memory for flatten_device_tree "
2108 chunk
= alloc_up(room
, 0);
2110 prom_panic("No memory for flatten_device_tree "
2111 "(claim failed)\n");
2112 *mem_end
= chunk
+ room
;
2115 ret
= (void *)*mem_start
;
2116 *mem_start
+= needed
;
2121 #define dt_push_token(token, mem_start, mem_end) \
2122 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
2124 static unsigned long __init
dt_find_string(char *str
)
2128 s
= os
= (char *)RELOC(dt_string_start
);
2130 while (s
< (char *)RELOC(dt_string_end
)) {
2131 if (strcmp(s
, str
) == 0)
2139 * The Open Firmware 1275 specification states properties must be 31 bytes or
2140 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
2142 #define MAX_PROPERTY_NAME 64
2144 static void __init
scan_dt_build_strings(phandle node
,
2145 unsigned long *mem_start
,
2146 unsigned long *mem_end
)
2148 char *prev_name
, *namep
, *sstart
;
2152 sstart
= (char *)RELOC(dt_string_start
);
2154 /* get and store all property names */
2155 prev_name
= RELOC("");
2157 /* 64 is max len of name including nul. */
2158 namep
= make_room(mem_start
, mem_end
, MAX_PROPERTY_NAME
, 1);
2159 if (call_prom("nextprop", 3, 1, node
, prev_name
, namep
) != 1) {
2160 /* No more nodes: unwind alloc */
2161 *mem_start
= (unsigned long)namep
;
2166 if (strcmp(namep
, RELOC("name")) == 0) {
2167 *mem_start
= (unsigned long)namep
;
2168 prev_name
= RELOC("name");
2171 /* get/create string entry */
2172 soff
= dt_find_string(namep
);
2174 *mem_start
= (unsigned long)namep
;
2175 namep
= sstart
+ soff
;
2177 /* Trim off some if we can */
2178 *mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
2179 RELOC(dt_string_end
) = *mem_start
;
2184 /* do all our children */
2185 child
= call_prom("child", 1, 1, node
);
2186 while (child
!= 0) {
2187 scan_dt_build_strings(child
, mem_start
, mem_end
);
2188 child
= call_prom("peer", 1, 1, child
);
2192 static void __init
scan_dt_build_struct(phandle node
, unsigned long *mem_start
,
2193 unsigned long *mem_end
)
2196 char *namep
, *prev_name
, *sstart
, *p
, *ep
, *lp
, *path
;
2198 unsigned char *valp
;
2199 static char pname
[MAX_PROPERTY_NAME
];
2200 int l
, room
, has_phandle
= 0;
2202 dt_push_token(OF_DT_BEGIN_NODE
, mem_start
, mem_end
);
2204 /* get the node's full name */
2205 namep
= (char *)*mem_start
;
2206 room
= *mem_end
- *mem_start
;
2209 l
= call_prom("package-to-path", 3, 1, node
, namep
, room
);
2211 /* Didn't fit? Get more room. */
2213 if (l
>= *mem_end
- *mem_start
)
2214 namep
= make_room(mem_start
, mem_end
, l
+1, 1);
2215 call_prom("package-to-path", 3, 1, node
, namep
, l
);
2219 /* Fixup an Apple bug where they have bogus \0 chars in the
2220 * middle of the path in some properties, and extract
2221 * the unit name (everything after the last '/').
2223 for (lp
= p
= namep
, ep
= namep
+ l
; p
< ep
; p
++) {
2230 *mem_start
= _ALIGN((unsigned long)lp
+ 1, 4);
2233 /* get it again for debugging */
2234 path
= RELOC(prom_scratch
);
2235 memset(path
, 0, PROM_SCRATCH_SIZE
);
2236 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
2238 /* get and store all properties */
2239 prev_name
= RELOC("");
2240 sstart
= (char *)RELOC(dt_string_start
);
2242 if (call_prom("nextprop", 3, 1, node
, prev_name
,
2247 if (strcmp(RELOC(pname
), RELOC("name")) == 0) {
2248 prev_name
= RELOC("name");
2252 /* find string offset */
2253 soff
= dt_find_string(RELOC(pname
));
2255 prom_printf("WARNING: Can't find string index for"
2256 " <%s>, node %s\n", RELOC(pname
), path
);
2259 prev_name
= sstart
+ soff
;
2262 l
= call_prom("getproplen", 2, 1, node
, RELOC(pname
));
2265 if (l
== PROM_ERROR
)
2268 /* push property head */
2269 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
2270 dt_push_token(l
, mem_start
, mem_end
);
2271 dt_push_token(soff
, mem_start
, mem_end
);
2273 /* push property content */
2274 valp
= make_room(mem_start
, mem_end
, l
, 4);
2275 call_prom("getprop", 4, 1, node
, RELOC(pname
), valp
, l
);
2276 *mem_start
= _ALIGN(*mem_start
, 4);
2278 if (!strcmp(RELOC(pname
), RELOC("phandle")))
2282 /* Add a "linux,phandle" property if no "phandle" property already
2283 * existed (can happen with OPAL)
2286 soff
= dt_find_string(RELOC("linux,phandle"));
2288 prom_printf("WARNING: Can't find string index for"
2289 " <linux-phandle> node %s\n", path
);
2291 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
2292 dt_push_token(4, mem_start
, mem_end
);
2293 dt_push_token(soff
, mem_start
, mem_end
);
2294 valp
= make_room(mem_start
, mem_end
, 4, 4);
2295 *(u32
*)valp
= node
;
2299 /* do all our children */
2300 child
= call_prom("child", 1, 1, node
);
2301 while (child
!= 0) {
2302 scan_dt_build_struct(child
, mem_start
, mem_end
);
2303 child
= call_prom("peer", 1, 1, child
);
2306 dt_push_token(OF_DT_END_NODE
, mem_start
, mem_end
);
2309 static void __init
flatten_device_tree(void)
2312 unsigned long mem_start
, mem_end
, room
;
2313 struct boot_param_header
*hdr
;
2314 struct prom_t
*_prom
= &RELOC(prom
);
2319 * Check how much room we have between alloc top & bottom (+/- a
2320 * few pages), crop to 1MB, as this is our "chunk" size
2322 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
) - 0x4000;
2323 if (room
> DEVTREE_CHUNK_SIZE
)
2324 room
= DEVTREE_CHUNK_SIZE
;
2325 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom
));
2327 /* Now try to claim that */
2328 mem_start
= (unsigned long)alloc_up(room
, PAGE_SIZE
);
2330 prom_panic("Can't allocate initial device-tree chunk\n");
2331 mem_end
= mem_start
+ room
;
2333 /* Get root of tree */
2334 root
= call_prom("peer", 1, 1, (phandle
)0);
2335 if (root
== (phandle
)0)
2336 prom_panic ("couldn't get device tree root\n");
2338 /* Build header and make room for mem rsv map */
2339 mem_start
= _ALIGN(mem_start
, 4);
2340 hdr
= make_room(&mem_start
, &mem_end
,
2341 sizeof(struct boot_param_header
), 4);
2342 RELOC(dt_header_start
) = (unsigned long)hdr
;
2343 rsvmap
= make_room(&mem_start
, &mem_end
, sizeof(mem_reserve_map
), 8);
2345 /* Start of strings */
2346 mem_start
= PAGE_ALIGN(mem_start
);
2347 RELOC(dt_string_start
) = mem_start
;
2348 mem_start
+= 4; /* hole */
2350 /* Add "linux,phandle" in there, we'll need it */
2351 namep
= make_room(&mem_start
, &mem_end
, 16, 1);
2352 strcpy(namep
, RELOC("linux,phandle"));
2353 mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
2355 /* Build string array */
2356 prom_printf("Building dt strings...\n");
2357 scan_dt_build_strings(root
, &mem_start
, &mem_end
);
2358 RELOC(dt_string_end
) = mem_start
;
2360 /* Build structure */
2361 mem_start
= PAGE_ALIGN(mem_start
);
2362 RELOC(dt_struct_start
) = mem_start
;
2363 prom_printf("Building dt structure...\n");
2364 scan_dt_build_struct(root
, &mem_start
, &mem_end
);
2365 dt_push_token(OF_DT_END
, &mem_start
, &mem_end
);
2366 RELOC(dt_struct_end
) = PAGE_ALIGN(mem_start
);
2369 hdr
->boot_cpuid_phys
= _prom
->cpu
;
2370 hdr
->magic
= OF_DT_HEADER
;
2371 hdr
->totalsize
= RELOC(dt_struct_end
) - RELOC(dt_header_start
);
2372 hdr
->off_dt_struct
= RELOC(dt_struct_start
) - RELOC(dt_header_start
);
2373 hdr
->off_dt_strings
= RELOC(dt_string_start
) - RELOC(dt_header_start
);
2374 hdr
->dt_strings_size
= RELOC(dt_string_end
) - RELOC(dt_string_start
);
2375 hdr
->off_mem_rsvmap
= ((unsigned long)rsvmap
) - RELOC(dt_header_start
);
2376 hdr
->version
= OF_DT_VERSION
;
2377 /* Version 16 is not backward compatible */
2378 hdr
->last_comp_version
= 0x10;
2380 /* Copy the reserve map in */
2381 memcpy(rsvmap
, RELOC(mem_reserve_map
), sizeof(mem_reserve_map
));
2386 prom_printf("reserved memory map:\n");
2387 for (i
= 0; i
< RELOC(mem_reserve_cnt
); i
++)
2388 prom_printf(" %x - %x\n",
2389 RELOC(mem_reserve_map
)[i
].base
,
2390 RELOC(mem_reserve_map
)[i
].size
);
2393 /* Bump mem_reserve_cnt to cause further reservations to fail
2394 * since it's too late.
2396 RELOC(mem_reserve_cnt
) = MEM_RESERVE_MAP_SIZE
;
2398 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2399 RELOC(dt_string_start
), RELOC(dt_string_end
));
2400 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2401 RELOC(dt_struct_start
), RELOC(dt_struct_end
));
2405 #ifdef CONFIG_PPC_MAPLE
2406 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2407 * The values are bad, and it doesn't even have the right number of cells. */
2408 static void __init
fixup_device_tree_maple(void)
2411 u32 rloc
= 0x01002000; /* IO space; PCI device = 4 */
2415 name
= "/ht@0/isa@4";
2416 isa
= call_prom("finddevice", 1, 1, ADDR(name
));
2417 if (!PHANDLE_VALID(isa
)) {
2418 name
= "/ht@0/isa@6";
2419 isa
= call_prom("finddevice", 1, 1, ADDR(name
));
2420 rloc
= 0x01003000; /* IO space; PCI device = 6 */
2422 if (!PHANDLE_VALID(isa
))
2425 if (prom_getproplen(isa
, "ranges") != 12)
2427 if (prom_getprop(isa
, "ranges", isa_ranges
, sizeof(isa_ranges
))
2431 if (isa_ranges
[0] != 0x1 ||
2432 isa_ranges
[1] != 0xf4000000 ||
2433 isa_ranges
[2] != 0x00010000)
2436 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2438 isa_ranges
[0] = 0x1;
2439 isa_ranges
[1] = 0x0;
2440 isa_ranges
[2] = rloc
;
2441 isa_ranges
[3] = 0x0;
2442 isa_ranges
[4] = 0x0;
2443 isa_ranges
[5] = 0x00010000;
2444 prom_setprop(isa
, name
, "ranges",
2445 isa_ranges
, sizeof(isa_ranges
));
2448 #define CPC925_MC_START 0xf8000000
2449 #define CPC925_MC_LENGTH 0x1000000
2450 /* The values for memory-controller don't have right number of cells */
2451 static void __init
fixup_device_tree_maple_memory_controller(void)
2455 char *name
= "/hostbridge@f8000000";
2456 struct prom_t
*_prom
= &RELOC(prom
);
2459 mc
= call_prom("finddevice", 1, 1, ADDR(name
));
2460 if (!PHANDLE_VALID(mc
))
2463 if (prom_getproplen(mc
, "reg") != 8)
2466 prom_getprop(_prom
->root
, "#address-cells", &ac
, sizeof(ac
));
2467 prom_getprop(_prom
->root
, "#size-cells", &sc
, sizeof(sc
));
2468 if ((ac
!= 2) || (sc
!= 2))
2471 if (prom_getprop(mc
, "reg", mc_reg
, sizeof(mc_reg
)) == PROM_ERROR
)
2474 if (mc_reg
[0] != CPC925_MC_START
|| mc_reg
[1] != CPC925_MC_LENGTH
)
2477 prom_printf("Fixing up bogus hostbridge on Maple...\n");
2480 mc_reg
[1] = CPC925_MC_START
;
2482 mc_reg
[3] = CPC925_MC_LENGTH
;
2483 prom_setprop(mc
, name
, "reg", mc_reg
, sizeof(mc_reg
));
2486 #define fixup_device_tree_maple()
2487 #define fixup_device_tree_maple_memory_controller()
2490 #ifdef CONFIG_PPC_CHRP
2492 * Pegasos and BriQ lacks the "ranges" property in the isa node
2493 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2494 * Pegasos has the IDE configured in legacy mode, but advertised as native
2496 static void __init
fixup_device_tree_chrp(void)
2500 u32 rloc
= 0x01006000; /* IO space; PCI device = 12 */
2504 name
= "/pci@80000000/isa@c";
2505 ph
= call_prom("finddevice", 1, 1, ADDR(name
));
2506 if (!PHANDLE_VALID(ph
)) {
2507 name
= "/pci@ff500000/isa@6";
2508 ph
= call_prom("finddevice", 1, 1, ADDR(name
));
2509 rloc
= 0x01003000; /* IO space; PCI device = 6 */
2511 if (PHANDLE_VALID(ph
)) {
2512 rc
= prom_getproplen(ph
, "ranges");
2513 if (rc
== 0 || rc
== PROM_ERROR
) {
2514 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2521 prop
[5] = 0x00010000;
2522 prom_setprop(ph
, name
, "ranges", prop
, sizeof(prop
));
2526 name
= "/pci@80000000/ide@C,1";
2527 ph
= call_prom("finddevice", 1, 1, ADDR(name
));
2528 if (PHANDLE_VALID(ph
)) {
2529 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2532 prom_setprop(ph
, name
, "interrupts", prop
, 2*sizeof(u32
));
2533 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2534 rc
= prom_getprop(ph
, "class-code", prop
, sizeof(u32
));
2535 if (rc
== sizeof(u32
)) {
2537 prom_setprop(ph
, name
, "class-code", prop
, sizeof(u32
));
2542 #define fixup_device_tree_chrp()
2545 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2546 static void __init
fixup_device_tree_pmac(void)
2548 phandle u3
, i2c
, mpic
;
2553 /* Some G5s have a missing interrupt definition, fix it up here */
2554 u3
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2555 if (!PHANDLE_VALID(u3
))
2557 i2c
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2558 if (!PHANDLE_VALID(i2c
))
2560 mpic
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2561 if (!PHANDLE_VALID(mpic
))
2564 /* check if proper rev of u3 */
2565 if (prom_getprop(u3
, "device-rev", &u3_rev
, sizeof(u3_rev
))
2568 if (u3_rev
< 0x35 || u3_rev
> 0x39)
2570 /* does it need fixup ? */
2571 if (prom_getproplen(i2c
, "interrupts") > 0)
2574 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2576 /* interrupt on this revision of u3 is number 0 and level */
2579 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2580 &interrupts
, sizeof(interrupts
));
2582 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2583 &parent
, sizeof(parent
));
2586 #define fixup_device_tree_pmac()
2589 #ifdef CONFIG_PPC_EFIKA
2591 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2592 * to talk to the phy. If the phy-handle property is missing, then this
2593 * function is called to add the appropriate nodes and link it to the
2596 static void __init
fixup_device_tree_efika_add_phy(void)
2602 /* Check if /builtin/ethernet exists - bail if it doesn't */
2603 node
= call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2604 if (!PHANDLE_VALID(node
))
2607 /* Check if the phy-handle property exists - bail if it does */
2608 rv
= prom_getprop(node
, "phy-handle", prop
, sizeof(prop
));
2613 * At this point the ethernet device doesn't have a phy described.
2614 * Now we need to add the missing phy node and linkage
2617 /* Check for an MDIO bus node - if missing then create one */
2618 node
= call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2619 if (!PHANDLE_VALID(node
)) {
2620 prom_printf("Adding Ethernet MDIO node\n");
2621 call_prom("interpret", 1, 1,
2622 " s\" /builtin\" find-device"
2624 " 1 encode-int s\" #address-cells\" property"
2625 " 0 encode-int s\" #size-cells\" property"
2626 " s\" mdio\" device-name"
2627 " s\" fsl,mpc5200b-mdio\" encode-string"
2628 " s\" compatible\" property"
2629 " 0xf0003000 0x400 reg"
2631 " 0x5 encode-int encode+"
2632 " 0x3 encode-int encode+"
2633 " s\" interrupts\" property"
2637 /* Check for a PHY device node - if missing then create one and
2638 * give it's phandle to the ethernet node */
2639 node
= call_prom("finddevice", 1, 1,
2640 ADDR("/builtin/mdio/ethernet-phy"));
2641 if (!PHANDLE_VALID(node
)) {
2642 prom_printf("Adding Ethernet PHY node\n");
2643 call_prom("interpret", 1, 1,
2644 " s\" /builtin/mdio\" find-device"
2646 " s\" ethernet-phy\" device-name"
2647 " 0x10 encode-int s\" reg\" property"
2651 " s\" /builtin/ethernet\" find-device"
2653 " s\" phy-handle\" property"
2658 static void __init
fixup_device_tree_efika(void)
2660 int sound_irq
[3] = { 2, 2, 0 };
2661 int bcomm_irq
[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2662 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2663 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2664 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2669 /* Check if we're really running on a EFIKA */
2670 node
= call_prom("finddevice", 1, 1, ADDR("/"));
2671 if (!PHANDLE_VALID(node
))
2674 rv
= prom_getprop(node
, "model", prop
, sizeof(prop
));
2675 if (rv
== PROM_ERROR
)
2677 if (strcmp(prop
, "EFIKA5K2"))
2680 prom_printf("Applying EFIKA device tree fixups\n");
2682 /* Claiming to be 'chrp' is death */
2683 node
= call_prom("finddevice", 1, 1, ADDR("/"));
2684 rv
= prom_getprop(node
, "device_type", prop
, sizeof(prop
));
2685 if (rv
!= PROM_ERROR
&& (strcmp(prop
, "chrp") == 0))
2686 prom_setprop(node
, "/", "device_type", "efika", sizeof("efika"));
2688 /* CODEGEN,description is exposed in /proc/cpuinfo so
2690 rv
= prom_getprop(node
, "CODEGEN,description", prop
, sizeof(prop
));
2691 if (rv
!= PROM_ERROR
&& (strstr(prop
, "CHRP")))
2692 prom_setprop(node
, "/", "CODEGEN,description",
2693 "Efika 5200B PowerPC System",
2694 sizeof("Efika 5200B PowerPC System"));
2696 /* Fixup bestcomm interrupts property */
2697 node
= call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2698 if (PHANDLE_VALID(node
)) {
2699 len
= prom_getproplen(node
, "interrupts");
2701 prom_printf("Fixing bestcomm interrupts property\n");
2702 prom_setprop(node
, "/builtin/bestcom", "interrupts",
2703 bcomm_irq
, sizeof(bcomm_irq
));
2707 /* Fixup sound interrupts property */
2708 node
= call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2709 if (PHANDLE_VALID(node
)) {
2710 rv
= prom_getprop(node
, "interrupts", prop
, sizeof(prop
));
2711 if (rv
== PROM_ERROR
) {
2712 prom_printf("Adding sound interrupts property\n");
2713 prom_setprop(node
, "/builtin/sound", "interrupts",
2714 sound_irq
, sizeof(sound_irq
));
2718 /* Make sure ethernet phy-handle property exists */
2719 fixup_device_tree_efika_add_phy();
2722 #define fixup_device_tree_efika()
2725 static void __init
fixup_device_tree(void)
2727 fixup_device_tree_maple();
2728 fixup_device_tree_maple_memory_controller();
2729 fixup_device_tree_chrp();
2730 fixup_device_tree_pmac();
2731 fixup_device_tree_efika();
2734 static void __init
prom_find_boot_cpu(void)
2736 struct prom_t
*_prom
= &RELOC(prom
);
2742 if (prom_getprop(_prom
->chosen
, "cpu", &prom_cpu
, sizeof(prom_cpu
)) <= 0)
2745 cpu_pkg
= call_prom("instance-to-package", 1, 1, prom_cpu
);
2747 prom_getprop(cpu_pkg
, "reg", &getprop_rval
, sizeof(getprop_rval
));
2748 _prom
->cpu
= getprop_rval
;
2750 prom_debug("Booting CPU hw index = %lu\n", _prom
->cpu
);
2753 static void __init
prom_check_initrd(unsigned long r3
, unsigned long r4
)
2755 #ifdef CONFIG_BLK_DEV_INITRD
2756 struct prom_t
*_prom
= &RELOC(prom
);
2758 if (r3
&& r4
&& r4
!= 0xdeadbeef) {
2761 RELOC(prom_initrd_start
) = is_kernel_addr(r3
) ? __pa(r3
) : r3
;
2762 RELOC(prom_initrd_end
) = RELOC(prom_initrd_start
) + r4
;
2764 val
= RELOC(prom_initrd_start
);
2765 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-start",
2767 val
= RELOC(prom_initrd_end
);
2768 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-end",
2771 reserve_mem(RELOC(prom_initrd_start
),
2772 RELOC(prom_initrd_end
) - RELOC(prom_initrd_start
));
2774 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start
));
2775 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end
));
2777 #endif /* CONFIG_BLK_DEV_INITRD */
2782 * We enter here early on, when the Open Firmware prom is still
2783 * handling exceptions and the MMU hash table for us.
2786 unsigned long __init
prom_init(unsigned long r3
, unsigned long r4
,
2788 unsigned long r6
, unsigned long r7
,
2789 unsigned long kbase
)
2791 struct prom_t
*_prom
;
2795 unsigned long offset
= reloc_offset();
2799 _prom
= &RELOC(prom
);
2802 * First zero the BSS
2804 memset(&RELOC(__bss_start
), 0, __bss_stop
- __bss_start
);
2807 * Init interface to Open Firmware, get some node references,
2810 prom_init_client_services(pp
);
2813 * See if this OF is old enough that we need to do explicit maps
2814 * and other workarounds
2819 * Init prom stdout device
2823 prom_printf("Preparing to boot %s", RELOC(linux_banner
));
2826 * Get default machine type. At this point, we do not differentiate
2827 * between pSeries SMP and pSeries LPAR
2829 RELOC(of_platform
) = prom_find_machine_type();
2830 prom_printf("Detected machine type: %x\n", RELOC(of_platform
));
2832 #ifndef CONFIG_NONSTATIC_KERNEL
2833 /* Bail if this is a kdump kernel. */
2834 if (PHYSICAL_START
> 0)
2835 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2839 * Check for an initrd
2841 prom_check_initrd(r3
, r4
);
2843 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
2845 * On pSeries, inform the firmware about our capabilities
2847 if (RELOC(of_platform
) == PLATFORM_PSERIES
||
2848 RELOC(of_platform
) == PLATFORM_PSERIES_LPAR
)
2849 prom_send_capabilities();
2853 * Copy the CPU hold code
2855 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2856 copy_and_flush(0, kbase
, 0x100, 0);
2859 * Do early parsing of command line
2861 early_cmdline_parse();
2864 * Initialize memory management within prom_init
2869 * Determine which cpu is actually running right _now_
2871 prom_find_boot_cpu();
2874 * Initialize display devices
2876 prom_check_displays();
2880 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2881 * that uses the allocator, we need to make sure we get the top of memory
2882 * available for us here...
2884 if (RELOC(of_platform
) == PLATFORM_PSERIES
)
2885 prom_initialize_tce_table();
2889 * On non-powermacs, try to instantiate RTAS. PowerMacs don't
2890 * have a usable RTAS implementation.
2892 if (RELOC(of_platform
) != PLATFORM_POWERMAC
&&
2893 RELOC(of_platform
) != PLATFORM_OPAL
)
2894 prom_instantiate_rtas();
2896 #ifdef CONFIG_PPC_POWERNV
2897 /* Detect HAL and try instanciating it & doing takeover */
2898 if (RELOC(of_platform
) == PLATFORM_PSERIES_LPAR
) {
2900 if (RELOC(of_platform
) == PLATFORM_OPAL
) {
2901 prom_opal_hold_cpus();
2902 prom_opal_takeover();
2904 } else if (RELOC(of_platform
) == PLATFORM_OPAL
)
2905 prom_instantiate_opal();
2909 * On non-powermacs, put all CPUs in spin-loops.
2911 * PowerMacs use a different mechanism to spin CPUs
2913 if (RELOC(of_platform
) != PLATFORM_POWERMAC
&&
2914 RELOC(of_platform
) != PLATFORM_OPAL
)
2918 * Fill in some infos for use by the kernel later on
2920 if (RELOC(prom_memory_limit
))
2921 prom_setprop(_prom
->chosen
, "/chosen", "linux,memory-limit",
2922 &RELOC(prom_memory_limit
),
2923 sizeof(prom_memory_limit
));
2925 if (RELOC(prom_iommu_off
))
2926 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-off",
2929 if (RELOC(prom_iommu_force_on
))
2930 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-force-on",
2933 if (RELOC(prom_tce_alloc_start
)) {
2934 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-start",
2935 &RELOC(prom_tce_alloc_start
),
2936 sizeof(prom_tce_alloc_start
));
2937 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-end",
2938 &RELOC(prom_tce_alloc_end
),
2939 sizeof(prom_tce_alloc_end
));
2944 * Fixup any known bugs in the device-tree
2946 fixup_device_tree();
2949 * Now finally create the flattened device-tree
2951 prom_printf("copying OF device tree...\n");
2952 flatten_device_tree();
2955 * in case stdin is USB and still active on IBM machines...
2956 * Unfortunately quiesce crashes on some powermacs if we have
2957 * closed stdin already (in particular the powerbook 101). It
2958 * appears that the OPAL version of OFW doesn't like it either.
2960 if (RELOC(of_platform
) != PLATFORM_POWERMAC
&&
2961 RELOC(of_platform
) != PLATFORM_OPAL
)
2965 * Call OF "quiesce" method to shut down pending DMA's from
2968 prom_printf("Calling quiesce...\n");
2969 call_prom("quiesce", 0, 0);
2972 * And finally, call the kernel passing it the flattened device
2973 * tree and NULL as r5, thus triggering the new entry point which
2974 * is common to us and kexec
2976 hdr
= RELOC(dt_header_start
);
2978 /* Don't print anything after quiesce under OPAL, it crashes OFW */
2979 if (RELOC(of_platform
) != PLATFORM_OPAL
) {
2980 prom_printf("returning from prom_init\n");
2981 prom_debug("->dt_header_start=0x%x\n", hdr
);
2985 reloc_got2(-offset
);
2988 #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL
2989 /* OPAL early debug gets the OPAL base & entry in r8 and r9 */
2990 __start(hdr
, kbase
, 0, 0, 0,
2991 RELOC(prom_opal_base
), RELOC(prom_opal_entry
));
2993 __start(hdr
, kbase
, 0, 0, 0, 0, 0);