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/config.h>
20 #include <linux/kernel.h>
21 #include <linux/string.h>
22 #include <linux/init.h>
23 #include <linux/threads.h>
24 #include <linux/spinlock.h>
25 #include <linux/types.h>
26 #include <linux/pci.h>
27 #include <linux/proc_fs.h>
28 #include <linux/stringify.h>
29 #include <linux/delay.h>
30 #include <linux/initrd.h>
31 #include <linux/bitops.h>
35 #include <asm/processor.h>
39 #include <asm/system.h>
41 #include <asm/pgtable.h>
43 #include <asm/iommu.h>
44 #include <asm/btext.h>
45 #include <asm/sections.h>
46 #include <asm/machdep.h>
48 #ifdef CONFIG_LOGO_LINUX_CLUT224
49 #include <linux/linux_logo.h>
50 extern const struct linux_logo logo_linux_clut224
;
54 * Properties whose value is longer than this get excluded from our
55 * copy of the device tree. This value does need to be big enough to
56 * ensure that we don't lose things like the interrupt-map property
57 * on a PCI-PCI bridge.
59 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
62 * Eventually bump that one up
64 #define DEVTREE_CHUNK_SIZE 0x100000
67 * This is the size of the local memory reserve map that gets copied
68 * into the boot params passed to the kernel. That size is totally
69 * flexible as the kernel just reads the list until it encounters an
70 * entry with size 0, so it can be changed without breaking binary
73 #define MEM_RESERVE_MAP_SIZE 8
76 * prom_init() is called very early on, before the kernel text
77 * and data have been mapped to KERNELBASE. At this point the code
78 * is running at whatever address it has been loaded at.
79 * On ppc32 we compile with -mrelocatable, which means that references
80 * to extern and static variables get relocated automatically.
81 * On ppc64 we have to relocate the references explicitly with
82 * RELOC. (Note that strings count as static variables.)
84 * Because OF may have mapped I/O devices into the area starting at
85 * KERNELBASE, particularly on CHRP machines, we can't safely call
86 * OF once the kernel has been mapped to KERNELBASE. Therefore all
87 * OF calls must be done within prom_init().
89 * ADDR is used in calls to call_prom. The 4th and following
90 * arguments to call_prom should be 32-bit values.
91 * On ppc64, 64 bit values are truncated to 32 bits (and
92 * fortunately don't get interpreted as two arguments).
95 #define RELOC(x) (*PTRRELOC(&(x)))
96 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
97 #define OF_WORKAROUNDS 0
100 #define ADDR(x) (u32) (x)
101 #define OF_WORKAROUNDS of_workarounds
105 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
106 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
108 #define PROM_BUG() do { \
109 prom_printf("kernel BUG at %s line 0x%x!\n", \
110 RELOC(__FILE__), __LINE__); \
111 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
115 #define prom_debug(x...) prom_printf(x)
117 #define prom_debug(x...)
121 typedef u32 prom_arg_t
;
139 struct mem_map_entry
{
146 extern void __start(unsigned long r3
, unsigned long r4
, unsigned long r5
);
149 extern int enter_prom(struct prom_args
*args
, unsigned long entry
);
151 static inline int enter_prom(struct prom_args
*args
, unsigned long entry
)
153 return ((int (*)(struct prom_args
*))entry
)(args
);
157 extern void copy_and_flush(unsigned long dest
, unsigned long src
,
158 unsigned long size
, unsigned long offset
);
161 static struct prom_t __initdata prom
;
163 static unsigned long prom_entry __initdata
;
165 #define PROM_SCRATCH_SIZE 256
167 static char __initdata of_stdout_device
[256];
168 static char __initdata prom_scratch
[PROM_SCRATCH_SIZE
];
170 static unsigned long __initdata dt_header_start
;
171 static unsigned long __initdata dt_struct_start
, dt_struct_end
;
172 static unsigned long __initdata dt_string_start
, dt_string_end
;
174 static unsigned long __initdata prom_initrd_start
, prom_initrd_end
;
177 static int __initdata iommu_force_on
;
178 static int __initdata ppc64_iommu_off
;
179 static unsigned long __initdata prom_tce_alloc_start
;
180 static unsigned long __initdata prom_tce_alloc_end
;
183 /* Platforms codes are now obsolete in the kernel. Now only used within this
184 * file and ultimately gone too. Feel free to change them if you need, they
185 * are not shared with anything outside of this file anymore
187 #define PLATFORM_PSERIES 0x0100
188 #define PLATFORM_PSERIES_LPAR 0x0101
189 #define PLATFORM_LPAR 0x0001
190 #define PLATFORM_POWERMAC 0x0400
191 #define PLATFORM_GENERIC 0x0500
193 static int __initdata of_platform
;
195 static char __initdata prom_cmd_line
[COMMAND_LINE_SIZE
];
197 static unsigned long __initdata prom_memory_limit
;
199 static unsigned long __initdata alloc_top
;
200 static unsigned long __initdata alloc_top_high
;
201 static unsigned long __initdata alloc_bottom
;
202 static unsigned long __initdata rmo_top
;
203 static unsigned long __initdata ram_top
;
206 static unsigned long __initdata prom_crashk_base
;
207 static unsigned long __initdata prom_crashk_size
;
210 static struct mem_map_entry __initdata mem_reserve_map
[MEM_RESERVE_MAP_SIZE
];
211 static int __initdata mem_reserve_cnt
;
213 static cell_t __initdata regbuf
[1024];
216 #define MAX_CPU_THREADS 2
219 * Error results ... some OF calls will return "-1" on error, some
220 * will return 0, some will return either. To simplify, here are
221 * macros to use with any ihandle or phandle return value to check if
225 #define PROM_ERROR (-1u)
226 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
227 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
230 /* This is the one and *ONLY* place where we actually call open
234 static int __init
call_prom(const char *service
, int nargs
, int nret
, ...)
237 struct prom_args args
;
240 args
.service
= ADDR(service
);
244 va_start(list
, nret
);
245 for (i
= 0; i
< nargs
; i
++)
246 args
.args
[i
] = va_arg(list
, prom_arg_t
);
249 for (i
= 0; i
< nret
; i
++)
250 args
.args
[nargs
+i
] = 0;
252 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
255 return (nret
> 0) ? args
.args
[nargs
] : 0;
258 static int __init
call_prom_ret(const char *service
, int nargs
, int nret
,
259 prom_arg_t
*rets
, ...)
262 struct prom_args args
;
265 args
.service
= ADDR(service
);
269 va_start(list
, rets
);
270 for (i
= 0; i
< nargs
; i
++)
271 args
.args
[i
] = va_arg(list
, prom_arg_t
);
274 for (i
= 0; i
< nret
; i
++)
275 args
.args
[nargs
+i
] = 0;
277 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
281 for (i
= 1; i
< nret
; ++i
)
282 rets
[i
-1] = args
.args
[nargs
+i
];
284 return (nret
> 0) ? args
.args
[nargs
] : 0;
288 static void __init
prom_print(const char *msg
)
291 struct prom_t
*_prom
= &RELOC(prom
);
293 if (_prom
->stdout
== 0)
296 for (p
= msg
; *p
!= 0; p
= q
) {
297 for (q
= p
; *q
!= 0 && *q
!= '\n'; ++q
)
300 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
304 call_prom("write", 3, 1, _prom
->stdout
, ADDR("\r\n"), 2);
309 static void __init
prom_print_hex(unsigned long val
)
311 int i
, nibbles
= sizeof(val
)*2;
312 char buf
[sizeof(val
)*2+1];
313 struct prom_t
*_prom
= &RELOC(prom
);
315 for (i
= nibbles
-1; i
>= 0; i
--) {
316 buf
[i
] = (val
& 0xf) + '0';
318 buf
[i
] += ('a'-'0'-10);
322 call_prom("write", 3, 1, _prom
->stdout
, buf
, nibbles
);
326 static void __init
prom_printf(const char *format
, ...)
328 const char *p
, *q
, *s
;
331 struct prom_t
*_prom
= &RELOC(prom
);
333 va_start(args
, format
);
335 format
= PTRRELOC(format
);
337 for (p
= format
; *p
!= 0; p
= q
) {
338 for (q
= p
; *q
!= 0 && *q
!= '\n' && *q
!= '%'; ++q
)
341 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
346 call_prom("write", 3, 1, _prom
->stdout
,
356 s
= va_arg(args
, const char *);
361 v
= va_arg(args
, unsigned long);
369 static unsigned int __init
prom_claim(unsigned long virt
, unsigned long size
,
372 struct prom_t
*_prom
= &RELOC(prom
);
374 if (align
== 0 && (OF_WORKAROUNDS
& OF_WA_CLAIM
)) {
376 * Old OF requires we claim physical and virtual separately
377 * and then map explicitly (assuming virtual mode)
382 ret
= call_prom_ret("call-method", 5, 2, &result
,
383 ADDR("claim"), _prom
->memory
,
385 if (ret
!= 0 || result
== -1)
387 ret
= call_prom_ret("call-method", 5, 2, &result
,
388 ADDR("claim"), _prom
->mmumap
,
391 call_prom("call-method", 4, 1, ADDR("release"),
392 _prom
->memory
, size
, virt
);
395 /* the 0x12 is M (coherence) + PP == read/write */
396 call_prom("call-method", 6, 1,
397 ADDR("map"), _prom
->mmumap
, 0x12, size
, virt
, virt
);
400 return call_prom("claim", 3, 1, (prom_arg_t
)virt
, (prom_arg_t
)size
,
404 static void __init
__attribute__((noreturn
)) prom_panic(const char *reason
)
407 reason
= PTRRELOC(reason
);
410 /* Do not call exit because it clears the screen on pmac
411 * it also causes some sort of double-fault on early pmacs */
412 if (RELOC(of_platform
) == PLATFORM_POWERMAC
)
415 /* ToDo: should put up an SRC here on p/iSeries */
416 call_prom("exit", 0, 0);
418 for (;;) /* should never get here */
423 static int __init
prom_next_node(phandle
*nodep
)
427 if ((node
= *nodep
) != 0
428 && (*nodep
= call_prom("child", 1, 1, node
)) != 0)
430 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
433 if ((node
= call_prom("parent", 1, 1, node
)) == 0)
435 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
440 static int inline prom_getprop(phandle node
, const char *pname
,
441 void *value
, size_t valuelen
)
443 return call_prom("getprop", 4, 1, node
, ADDR(pname
),
444 (u32
)(unsigned long) value
, (u32
) valuelen
);
447 static int inline prom_getproplen(phandle node
, const char *pname
)
449 return call_prom("getproplen", 2, 1, node
, ADDR(pname
));
452 static void add_string(char **str
, const char *q
)
462 static char *tohex(unsigned int x
)
464 static char digits
[] = "0123456789abcdef";
465 static char result
[9];
472 result
[i
] = digits
[x
& 0xf];
474 } while (x
!= 0 && i
> 0);
478 static int __init
prom_setprop(phandle node
, const char *nodename
,
479 const char *pname
, void *value
, size_t valuelen
)
483 if (!(OF_WORKAROUNDS
& OF_WA_LONGTRAIL
))
484 return call_prom("setprop", 4, 1, node
, ADDR(pname
),
485 (u32
)(unsigned long) value
, (u32
) valuelen
);
487 /* gah... setprop doesn't work on longtrail, have to use interpret */
489 add_string(&p
, "dev");
490 add_string(&p
, nodename
);
491 add_string(&p
, tohex((u32
)(unsigned long) value
));
492 add_string(&p
, tohex(valuelen
));
493 add_string(&p
, tohex(ADDR(pname
)));
494 add_string(&p
, tohex(strlen(RELOC(pname
))));
495 add_string(&p
, "property");
497 return call_prom("interpret", 1, 1, (u32
)(unsigned long) cmd
);
500 /* We can't use the standard versions because of RELOC headaches. */
501 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
502 || ('a' <= (c) && (c) <= 'f') \
503 || ('A' <= (c) && (c) <= 'F'))
505 #define isdigit(c) ('0' <= (c) && (c) <= '9')
506 #define islower(c) ('a' <= (c) && (c) <= 'z')
507 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
509 unsigned long prom_strtoul(const char *cp
, const char **endp
)
511 unsigned long result
= 0, base
= 10, value
;
516 if (toupper(*cp
) == 'X') {
522 while (isxdigit(*cp
) &&
523 (value
= isdigit(*cp
) ? *cp
- '0' : toupper(*cp
) - 'A' + 10) < base
) {
524 result
= result
* base
+ value
;
534 unsigned long prom_memparse(const char *ptr
, const char **retptr
)
536 unsigned long ret
= prom_strtoul(ptr
, retptr
);
540 * We can't use a switch here because GCC *may* generate a
541 * jump table which won't work, because we're not running at
542 * the address we're linked at.
544 if ('G' == **retptr
|| 'g' == **retptr
)
547 if ('M' == **retptr
|| 'm' == **retptr
)
550 if ('K' == **retptr
|| 'k' == **retptr
)
562 * Early parsing of the command line passed to the kernel, used for
563 * "mem=x" and the options that affect the iommu
565 static void __init
early_cmdline_parse(void)
567 struct prom_t
*_prom
= &RELOC(prom
);
572 RELOC(prom_cmd_line
[0]) = 0;
573 p
= RELOC(prom_cmd_line
);
574 if ((long)_prom
->chosen
> 0)
575 l
= prom_getprop(_prom
->chosen
, "bootargs", p
, COMMAND_LINE_SIZE
-1);
576 #ifdef CONFIG_CMDLINE
577 if (l
== 0) /* dbl check */
578 strlcpy(RELOC(prom_cmd_line
),
579 RELOC(CONFIG_CMDLINE
), sizeof(prom_cmd_line
));
580 #endif /* CONFIG_CMDLINE */
581 prom_printf("command line: %s\n", RELOC(prom_cmd_line
));
584 opt
= strstr(RELOC(prom_cmd_line
), RELOC("iommu="));
586 prom_printf("iommu opt is: %s\n", opt
);
588 while (*opt
&& *opt
== ' ')
590 if (!strncmp(opt
, RELOC("off"), 3))
591 RELOC(ppc64_iommu_off
) = 1;
592 else if (!strncmp(opt
, RELOC("force"), 5))
593 RELOC(iommu_force_on
) = 1;
597 opt
= strstr(RELOC(prom_cmd_line
), RELOC("mem="));
600 RELOC(prom_memory_limit
) = prom_memparse(opt
, (const char **)&opt
);
602 /* Align to 16 MB == size of ppc64 large page */
603 RELOC(prom_memory_limit
) = ALIGN(RELOC(prom_memory_limit
), 0x1000000);
609 * crashkernel=size@addr specifies the location to reserve for
612 opt
= strstr(RELOC(prom_cmd_line
), RELOC("crashkernel="));
615 RELOC(prom_crashk_size
) =
616 prom_memparse(opt
, (const char **)&opt
);
618 if (ALIGN(RELOC(prom_crashk_size
), 0x1000000) !=
619 RELOC(prom_crashk_size
)) {
620 prom_printf("Warning: crashkernel size is not "
621 "aligned to 16MB\n");
625 * At present, the crash kernel always run at 32MB.
626 * Just ignore whatever user passed.
628 RELOC(prom_crashk_base
) = 0x2000000;
630 prom_printf("Warning: PPC64 kdump kernel always runs "
637 #ifdef CONFIG_PPC_PSERIES
639 * There are two methods for telling firmware what our capabilities are.
640 * Newer machines have an "ibm,client-architecture-support" method on the
641 * root node. For older machines, we have to call the "process-elf-header"
642 * method in the /packages/elf-loader node, passing it a fake 32-bit
643 * ELF header containing a couple of PT_NOTE sections that contain
644 * structures that contain various information.
648 * New method - extensible architecture description vector.
650 * Because the description vector contains a mix of byte and word
651 * values, we declare it as an unsigned char array, and use this
652 * macro to put word values in.
654 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
655 ((x) >> 8) & 0xff, (x) & 0xff
657 /* Option vector bits - generic bits in byte 1 */
658 #define OV_IGNORE 0x80 /* ignore this vector */
659 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
661 /* Option vector 1: processor architectures supported */
662 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
663 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
664 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
665 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
666 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
667 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
669 /* Option vector 2: Open Firmware options supported */
670 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
672 /* Option vector 3: processor options supported */
673 #define OV3_FP 0x80 /* floating point */
674 #define OV3_VMX 0x40 /* VMX/Altivec */
676 /* Option vector 5: PAPR/OF options supported */
677 #define OV5_LPAR 0x80 /* logical partitioning supported */
678 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
679 /* ibm,dynamic-reconfiguration-memory property supported */
680 #define OV5_DRCONF_MEMORY 0x20
681 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
684 * The architecture vector has an array of PVR mask/value pairs,
685 * followed by # option vectors - 1, followed by the option vectors.
687 static unsigned char ibm_architecture_vec
[] = {
688 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
689 W(0xffff0000), W(0x003e0000), /* POWER6 */
690 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
691 5 - 1, /* 5 option vectors */
693 /* option vector 1: processor architectures supported */
695 0, /* don't ignore, don't halt */
696 OV1_PPC_2_00
| OV1_PPC_2_01
| OV1_PPC_2_02
| OV1_PPC_2_03
|
697 OV1_PPC_2_04
| OV1_PPC_2_05
,
699 /* option vector 2: Open Firmware options supported */
703 W(0xffffffff), /* real_base */
704 W(0xffffffff), /* real_size */
705 W(0xffffffff), /* virt_base */
706 W(0xffffffff), /* virt_size */
707 W(0xffffffff), /* load_base */
708 W(64), /* 128MB min RMA */
709 W(0xffffffff), /* full client load */
710 0, /* min RMA percentage of total RAM */
711 48, /* max log_2(hash table size) */
713 /* option vector 3: processor options supported */
715 0, /* don't ignore, don't halt */
718 /* option vector 4: IBM PAPR implementation */
722 /* option vector 5: PAPR/OF options */
724 0, /* don't ignore, don't halt */
725 OV5_LPAR
| OV5_SPLPAR
| OV5_LARGE_PAGES
,
728 /* Old method - ELF header with PT_NOTE sections */
729 static struct fake_elf
{
736 char name
[8]; /* "PowerPC" */
750 char name
[24]; /* "IBM,RPA-Client-Config" */
764 .e_ident
= { 0x7f, 'E', 'L', 'F',
765 ELFCLASS32
, ELFDATA2MSB
, EV_CURRENT
},
766 .e_type
= ET_EXEC
, /* yeah right */
768 .e_version
= EV_CURRENT
,
769 .e_phoff
= offsetof(struct fake_elf
, phdr
),
770 .e_phentsize
= sizeof(Elf32_Phdr
),
776 .p_offset
= offsetof(struct fake_elf
, chrpnote
),
777 .p_filesz
= sizeof(struct chrpnote
)
780 .p_offset
= offsetof(struct fake_elf
, rpanote
),
781 .p_filesz
= sizeof(struct rpanote
)
785 .namesz
= sizeof("PowerPC"),
786 .descsz
= sizeof(struct chrpdesc
),
790 .real_mode
= ~0U, /* ~0 means "don't care" */
799 .namesz
= sizeof("IBM,RPA-Client-Config"),
800 .descsz
= sizeof(struct rpadesc
),
802 .name
= "IBM,RPA-Client-Config",
805 .min_rmo_size
= 64, /* in megabytes */
806 .min_rmo_percent
= 0,
807 .max_pft_size
= 48, /* 2^48 bytes max PFT size */
815 static void __init
prom_send_capabilities(void)
817 ihandle elfloader
, root
;
820 root
= call_prom("open", 1, 1, ADDR("/"));
822 /* try calling the ibm,client-architecture-support method */
823 if (call_prom_ret("call-method", 3, 2, &ret
,
824 ADDR("ibm,client-architecture-support"),
825 ADDR(ibm_architecture_vec
)) == 0) {
826 /* the call exists... */
828 prom_printf("WARNING: ibm,client-architecture"
829 "-support call FAILED!\n");
830 call_prom("close", 1, 0, root
);
833 call_prom("close", 1, 0, root
);
836 /* no ibm,client-architecture-support call, try the old way */
837 elfloader
= call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
838 if (elfloader
== 0) {
839 prom_printf("couldn't open /packages/elf-loader\n");
842 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
843 elfloader
, ADDR(&fake_elf
));
844 call_prom("close", 1, 0, elfloader
);
849 * Memory allocation strategy... our layout is normally:
851 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
852 * rare cases, initrd might end up being before the kernel though.
853 * We assume this won't override the final kernel at 0, we have no
854 * provision to handle that in this version, but it should hopefully
857 * alloc_top is set to the top of RMO, eventually shrink down if the
860 * alloc_bottom is set to the top of kernel/initrd
862 * from there, allocations are done this way : rtas is allocated
863 * topmost, and the device-tree is allocated from the bottom. We try
864 * to grow the device-tree allocation as we progress. If we can't,
865 * then we fail, we don't currently have a facility to restart
866 * elsewhere, but that shouldn't be necessary.
868 * Note that calls to reserve_mem have to be done explicitly, memory
869 * allocated with either alloc_up or alloc_down isn't automatically
875 * Allocates memory in the RMO upward from the kernel/initrd
877 * When align is 0, this is a special case, it means to allocate in place
878 * at the current location of alloc_bottom or fail (that is basically
879 * extending the previous allocation). Used for the device-tree flattening
881 static unsigned long __init
alloc_up(unsigned long size
, unsigned long align
)
883 unsigned long base
= RELOC(alloc_bottom
);
884 unsigned long addr
= 0;
887 base
= _ALIGN_UP(base
, align
);
888 prom_debug("alloc_up(%x, %x)\n", size
, align
);
889 if (RELOC(ram_top
) == 0)
890 prom_panic("alloc_up() called with mem not initialized\n");
893 base
= _ALIGN_UP(RELOC(alloc_bottom
), align
);
895 base
= RELOC(alloc_bottom
);
897 for(; (base
+ size
) <= RELOC(alloc_top
);
898 base
= _ALIGN_UP(base
+ 0x100000, align
)) {
899 prom_debug(" trying: 0x%x\n\r", base
);
900 addr
= (unsigned long)prom_claim(base
, size
, 0);
901 if (addr
!= PROM_ERROR
&& addr
!= 0)
909 RELOC(alloc_bottom
) = addr
;
911 prom_debug(" -> %x\n", addr
);
912 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
913 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
914 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
915 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
916 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
922 * Allocates memory downward, either from top of RMO, or if highmem
923 * is set, from the top of RAM. Note that this one doesn't handle
924 * failures. It does claim memory if highmem is not set.
926 static unsigned long __init
alloc_down(unsigned long size
, unsigned long align
,
929 unsigned long base
, addr
= 0;
931 prom_debug("alloc_down(%x, %x, %s)\n", size
, align
,
932 highmem
? RELOC("(high)") : RELOC("(low)"));
933 if (RELOC(ram_top
) == 0)
934 prom_panic("alloc_down() called with mem not initialized\n");
937 /* Carve out storage for the TCE table. */
938 addr
= _ALIGN_DOWN(RELOC(alloc_top_high
) - size
, align
);
939 if (addr
<= RELOC(alloc_bottom
))
941 /* Will we bump into the RMO ? If yes, check out that we
942 * didn't overlap existing allocations there, if we did,
943 * we are dead, we must be the first in town !
945 if (addr
< RELOC(rmo_top
)) {
946 /* Good, we are first */
947 if (RELOC(alloc_top
) == RELOC(rmo_top
))
948 RELOC(alloc_top
) = RELOC(rmo_top
) = addr
;
952 RELOC(alloc_top_high
) = addr
;
956 base
= _ALIGN_DOWN(RELOC(alloc_top
) - size
, align
);
957 for (; base
> RELOC(alloc_bottom
);
958 base
= _ALIGN_DOWN(base
- 0x100000, align
)) {
959 prom_debug(" trying: 0x%x\n\r", base
);
960 addr
= (unsigned long)prom_claim(base
, size
, 0);
961 if (addr
!= PROM_ERROR
&& addr
!= 0)
967 RELOC(alloc_top
) = addr
;
970 prom_debug(" -> %x\n", addr
);
971 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
972 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
973 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
974 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
975 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
983 static unsigned long __init
prom_next_cell(int s
, cell_t
**cellp
)
988 /* Ignore more than 2 cells */
989 while (s
> sizeof(unsigned long) / 4) {
1005 * Very dumb function for adding to the memory reserve list, but
1006 * we don't need anything smarter at this point
1008 * XXX Eventually check for collisions. They should NEVER happen.
1009 * If problems seem to show up, it would be a good start to track
1012 static void reserve_mem(u64 base
, u64 size
)
1014 u64 top
= base
+ size
;
1015 unsigned long cnt
= RELOC(mem_reserve_cnt
);
1020 /* We need to always keep one empty entry so that we
1021 * have our terminator with "size" set to 0 since we are
1022 * dumb and just copy this entire array to the boot params
1024 base
= _ALIGN_DOWN(base
, PAGE_SIZE
);
1025 top
= _ALIGN_UP(top
, PAGE_SIZE
);
1028 if (cnt
>= (MEM_RESERVE_MAP_SIZE
- 1))
1029 prom_panic("Memory reserve map exhausted !\n");
1030 RELOC(mem_reserve_map
)[cnt
].base
= base
;
1031 RELOC(mem_reserve_map
)[cnt
].size
= size
;
1032 RELOC(mem_reserve_cnt
) = cnt
+ 1;
1036 * Initialize memory allocation mecanism, parse "memory" nodes and
1037 * obtain that way the top of memory and RMO to setup out local allocator
1039 static void __init
prom_init_mem(void)
1042 char *path
, type
[64];
1045 struct prom_t
*_prom
= &RELOC(prom
);
1049 * We iterate the memory nodes to find
1050 * 1) top of RMO (first node)
1054 prom_getprop(_prom
->root
, "#address-cells", &rac
, sizeof(rac
));
1056 prom_getprop(_prom
->root
, "#size-cells", &rsc
, sizeof(rsc
));
1057 prom_debug("root_addr_cells: %x\n", (unsigned long) rac
);
1058 prom_debug("root_size_cells: %x\n", (unsigned long) rsc
);
1060 prom_debug("scanning memory:\n");
1061 path
= RELOC(prom_scratch
);
1063 for (node
= 0; prom_next_node(&node
); ) {
1065 prom_getprop(node
, "device_type", type
, sizeof(type
));
1069 * CHRP Longtrail machines have no device_type
1070 * on the memory node, so check the name instead...
1072 prom_getprop(node
, "name", type
, sizeof(type
));
1074 if (strcmp(type
, RELOC("memory")))
1077 plen
= prom_getprop(node
, "reg", RELOC(regbuf
), sizeof(regbuf
));
1078 if (plen
> sizeof(regbuf
)) {
1079 prom_printf("memory node too large for buffer !\n");
1080 plen
= sizeof(regbuf
);
1083 endp
= p
+ (plen
/ sizeof(cell_t
));
1086 memset(path
, 0, PROM_SCRATCH_SIZE
);
1087 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1088 prom_debug(" node %s :\n", path
);
1089 #endif /* DEBUG_PROM */
1091 while ((endp
- p
) >= (rac
+ rsc
)) {
1092 unsigned long base
, size
;
1094 base
= prom_next_cell(rac
, &p
);
1095 size
= prom_next_cell(rsc
, &p
);
1099 prom_debug(" %x %x\n", base
, size
);
1100 if (base
== 0 && (RELOC(of_platform
) & PLATFORM_LPAR
))
1101 RELOC(rmo_top
) = size
;
1102 if ((base
+ size
) > RELOC(ram_top
))
1103 RELOC(ram_top
) = base
+ size
;
1107 RELOC(alloc_bottom
) = PAGE_ALIGN((unsigned long)&RELOC(_end
) + 0x4000);
1109 /* Check if we have an initrd after the kernel, if we do move our bottom
1112 if (RELOC(prom_initrd_start
)) {
1113 if (RELOC(prom_initrd_end
) > RELOC(alloc_bottom
))
1114 RELOC(alloc_bottom
) = PAGE_ALIGN(RELOC(prom_initrd_end
));
1118 * If prom_memory_limit is set we reduce the upper limits *except* for
1119 * alloc_top_high. This must be the real top of RAM so we can put
1123 RELOC(alloc_top_high
) = RELOC(ram_top
);
1125 if (RELOC(prom_memory_limit
)) {
1126 if (RELOC(prom_memory_limit
) <= RELOC(alloc_bottom
)) {
1127 prom_printf("Ignoring mem=%x <= alloc_bottom.\n",
1128 RELOC(prom_memory_limit
));
1129 RELOC(prom_memory_limit
) = 0;
1130 } else if (RELOC(prom_memory_limit
) >= RELOC(ram_top
)) {
1131 prom_printf("Ignoring mem=%x >= ram_top.\n",
1132 RELOC(prom_memory_limit
));
1133 RELOC(prom_memory_limit
) = 0;
1135 RELOC(ram_top
) = RELOC(prom_memory_limit
);
1136 RELOC(rmo_top
) = min(RELOC(rmo_top
), RELOC(prom_memory_limit
));
1141 * Setup our top alloc point, that is top of RMO or top of
1142 * segment 0 when running non-LPAR.
1143 * Some RS64 machines have buggy firmware where claims up at
1144 * 1GB fail. Cap at 768MB as a workaround.
1145 * Since 768MB is plenty of room, and we need to cap to something
1146 * reasonable on 32-bit, cap at 768MB on all machines.
1148 if (!RELOC(rmo_top
))
1149 RELOC(rmo_top
) = RELOC(ram_top
);
1150 RELOC(rmo_top
) = min(0x30000000ul
, RELOC(rmo_top
));
1151 RELOC(alloc_top
) = RELOC(rmo_top
);
1153 prom_printf("memory layout at init:\n");
1154 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit
));
1155 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
1156 prom_printf(" alloc_top : %x\n", RELOC(alloc_top
));
1157 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
1158 prom_printf(" rmo_top : %x\n", RELOC(rmo_top
));
1159 prom_printf(" ram_top : %x\n", RELOC(ram_top
));
1161 if (RELOC(prom_crashk_base
)) {
1162 prom_printf(" crashk_base : %x\n", RELOC(prom_crashk_base
));
1163 prom_printf(" crashk_size : %x\n", RELOC(prom_crashk_size
));
1170 * Allocate room for and instantiate RTAS
1172 static void __init
prom_instantiate_rtas(void)
1176 u32 base
, entry
= 0;
1179 prom_debug("prom_instantiate_rtas: start...\n");
1181 rtas_node
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1182 prom_debug("rtas_node: %x\n", rtas_node
);
1183 if (!PHANDLE_VALID(rtas_node
))
1186 prom_getprop(rtas_node
, "rtas-size", &size
, sizeof(size
));
1190 base
= alloc_down(size
, PAGE_SIZE
, 0);
1192 prom_printf("RTAS allocation failed !\n");
1196 rtas_inst
= call_prom("open", 1, 1, ADDR("/rtas"));
1197 if (!IHANDLE_VALID(rtas_inst
)) {
1198 prom_printf("opening rtas package failed (%x)\n", rtas_inst
);
1202 prom_printf("instantiating rtas at 0x%x ...", base
);
1204 if (call_prom_ret("call-method", 3, 2, &entry
,
1205 ADDR("instantiate-rtas"),
1206 rtas_inst
, base
) != 0
1208 prom_printf(" failed\n");
1211 prom_printf(" done\n");
1213 reserve_mem(base
, size
);
1215 prom_setprop(rtas_node
, "/rtas", "linux,rtas-base",
1216 &base
, sizeof(base
));
1217 prom_setprop(rtas_node
, "/rtas", "linux,rtas-entry",
1218 &entry
, sizeof(entry
));
1220 prom_debug("rtas base = 0x%x\n", base
);
1221 prom_debug("rtas entry = 0x%x\n", entry
);
1222 prom_debug("rtas size = 0x%x\n", (long)size
);
1224 prom_debug("prom_instantiate_rtas: end...\n");
1229 * Allocate room for and initialize TCE tables
1231 static void __init
prom_initialize_tce_table(void)
1235 char compatible
[64], type
[64], model
[64];
1236 char *path
= RELOC(prom_scratch
);
1238 u32 minalign
, minsize
;
1239 u64 tce_entry
, *tce_entryp
;
1240 u64 local_alloc_top
, local_alloc_bottom
;
1243 if (RELOC(ppc64_iommu_off
))
1246 prom_debug("starting prom_initialize_tce_table\n");
1248 /* Cache current top of allocs so we reserve a single block */
1249 local_alloc_top
= RELOC(alloc_top_high
);
1250 local_alloc_bottom
= local_alloc_top
;
1252 /* Search all nodes looking for PHBs. */
1253 for (node
= 0; prom_next_node(&node
); ) {
1257 prom_getprop(node
, "compatible",
1258 compatible
, sizeof(compatible
));
1259 prom_getprop(node
, "device_type", type
, sizeof(type
));
1260 prom_getprop(node
, "model", model
, sizeof(model
));
1262 if ((type
[0] == 0) || (strstr(type
, RELOC("pci")) == NULL
))
1265 /* Keep the old logic in tack to avoid regression. */
1266 if (compatible
[0] != 0) {
1267 if ((strstr(compatible
, RELOC("python")) == NULL
) &&
1268 (strstr(compatible
, RELOC("Speedwagon")) == NULL
) &&
1269 (strstr(compatible
, RELOC("Winnipeg")) == NULL
))
1271 } else if (model
[0] != 0) {
1272 if ((strstr(model
, RELOC("ython")) == NULL
) &&
1273 (strstr(model
, RELOC("peedwagon")) == NULL
) &&
1274 (strstr(model
, RELOC("innipeg")) == NULL
))
1278 if (prom_getprop(node
, "tce-table-minalign", &minalign
,
1279 sizeof(minalign
)) == PROM_ERROR
)
1281 if (prom_getprop(node
, "tce-table-minsize", &minsize
,
1282 sizeof(minsize
)) == PROM_ERROR
)
1283 minsize
= 4UL << 20;
1286 * Even though we read what OF wants, we just set the table
1287 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1288 * By doing this, we avoid the pitfalls of trying to DMA to
1289 * MMIO space and the DMA alias hole.
1291 * On POWER4, firmware sets the TCE region by assuming
1292 * each TCE table is 8MB. Using this memory for anything
1293 * else will impact performance, so we always allocate 8MB.
1296 if (__is_processor(PV_POWER4
) || __is_processor(PV_POWER4p
))
1297 minsize
= 8UL << 20;
1299 minsize
= 4UL << 20;
1301 /* Align to the greater of the align or size */
1302 align
= max(minalign
, minsize
);
1303 base
= alloc_down(minsize
, align
, 1);
1305 prom_panic("ERROR, cannot find space for TCE table.\n");
1306 if (base
< local_alloc_bottom
)
1307 local_alloc_bottom
= base
;
1309 /* It seems OF doesn't null-terminate the path :-( */
1310 memset(path
, 0, sizeof(path
));
1311 /* Call OF to setup the TCE hardware */
1312 if (call_prom("package-to-path", 3, 1, node
,
1313 path
, PROM_SCRATCH_SIZE
-1) == PROM_ERROR
) {
1314 prom_printf("package-to-path failed\n");
1317 /* Save away the TCE table attributes for later use. */
1318 prom_setprop(node
, path
, "linux,tce-base", &base
, sizeof(base
));
1319 prom_setprop(node
, path
, "linux,tce-size", &minsize
, sizeof(minsize
));
1321 prom_debug("TCE table: %s\n", path
);
1322 prom_debug("\tnode = 0x%x\n", node
);
1323 prom_debug("\tbase = 0x%x\n", base
);
1324 prom_debug("\tsize = 0x%x\n", minsize
);
1326 /* Initialize the table to have a one-to-one mapping
1327 * over the allocated size.
1329 tce_entryp
= (unsigned long *)base
;
1330 for (i
= 0; i
< (minsize
>> 3) ;tce_entryp
++, i
++) {
1331 tce_entry
= (i
<< PAGE_SHIFT
);
1333 *tce_entryp
= tce_entry
;
1336 prom_printf("opening PHB %s", path
);
1337 phb_node
= call_prom("open", 1, 1, path
);
1339 prom_printf("... failed\n");
1341 prom_printf("... done\n");
1343 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1344 phb_node
, -1, minsize
,
1345 (u32
) base
, (u32
) (base
>> 32));
1346 call_prom("close", 1, 0, phb_node
);
1349 reserve_mem(local_alloc_bottom
, local_alloc_top
- local_alloc_bottom
);
1351 if (RELOC(prom_memory_limit
)) {
1353 * We align the start to a 16MB boundary so we can map
1354 * the TCE area using large pages if possible.
1355 * The end should be the top of RAM so no need to align it.
1357 RELOC(prom_tce_alloc_start
) = _ALIGN_DOWN(local_alloc_bottom
,
1359 RELOC(prom_tce_alloc_end
) = local_alloc_top
;
1362 /* Flag the first invalid entry */
1363 prom_debug("ending prom_initialize_tce_table\n");
1368 * With CHRP SMP we need to use the OF to start the other processors.
1369 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1370 * so we have to put the processors into a holding pattern controlled
1371 * by the kernel (not OF) before we destroy the OF.
1373 * This uses a chunk of low memory, puts some holding pattern
1374 * code there and sends the other processors off to there until
1375 * smp_boot_cpus tells them to do something. The holding pattern
1376 * checks that address until its cpu # is there, when it is that
1377 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1378 * of setting those values.
1380 * We also use physical address 0x4 here to tell when a cpu
1381 * is in its holding pattern code.
1385 extern void __secondary_hold(void);
1386 extern unsigned long __secondary_hold_spinloop
;
1387 extern unsigned long __secondary_hold_acknowledge
;
1390 * We want to reference the copy of __secondary_hold_* in the
1391 * 0 - 0x100 address range
1393 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1395 static void __init
prom_hold_cpus(void)
1402 unsigned int interrupt_server
[MAX_CPU_THREADS
];
1403 unsigned int cpu_threads
, hw_cpu_num
;
1405 struct prom_t
*_prom
= &RELOC(prom
);
1406 unsigned long *spinloop
1407 = (void *) LOW_ADDR(__secondary_hold_spinloop
);
1408 unsigned long *acknowledge
1409 = (void *) LOW_ADDR(__secondary_hold_acknowledge
);
1411 /* __secondary_hold is actually a descriptor, not the text address */
1412 unsigned long secondary_hold
1413 = __pa(*PTRRELOC((unsigned long *)__secondary_hold
));
1415 unsigned long secondary_hold
= LOW_ADDR(__secondary_hold
);
1418 prom_debug("prom_hold_cpus: start...\n");
1419 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop
);
1420 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop
);
1421 prom_debug(" 1) acknowledge = 0x%x\n",
1422 (unsigned long)acknowledge
);
1423 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge
);
1424 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold
);
1426 /* Set the common spinloop variable, so all of the secondary cpus
1427 * will block when they are awakened from their OF spinloop.
1428 * This must occur for both SMP and non SMP kernels, since OF will
1429 * be trashed when we move the kernel.
1434 for (node
= 0; prom_next_node(&node
); ) {
1436 prom_getprop(node
, "device_type", type
, sizeof(type
));
1437 if (strcmp(type
, RELOC("cpu")) != 0)
1440 /* Skip non-configured cpus. */
1441 if (prom_getprop(node
, "status", type
, sizeof(type
)) > 0)
1442 if (strcmp(type
, RELOC("okay")) != 0)
1446 prom_getprop(node
, "reg", ®
, sizeof(reg
));
1448 prom_debug("\ncpuid = 0x%x\n", cpuid
);
1449 prom_debug("cpu hw idx = 0x%x\n", reg
);
1451 /* Init the acknowledge var which will be reset by
1452 * the secondary cpu when it awakens from its OF
1455 *acknowledge
= (unsigned long)-1;
1457 propsize
= prom_getprop(node
, "ibm,ppc-interrupt-server#s",
1459 sizeof(interrupt_server
));
1461 /* no property. old hardware has no SMT */
1463 interrupt_server
[0] = reg
; /* fake it with phys id */
1465 /* We have a threaded processor */
1466 cpu_threads
= propsize
/ sizeof(u32
);
1467 if (cpu_threads
> MAX_CPU_THREADS
) {
1468 prom_printf("SMT: too many threads!\n"
1469 "SMT: found %x, max is %x\n",
1470 cpu_threads
, MAX_CPU_THREADS
);
1471 cpu_threads
= 1; /* ToDo: panic? */
1475 hw_cpu_num
= interrupt_server
[0];
1476 if (hw_cpu_num
!= _prom
->cpu
) {
1477 /* Primary Thread of non-boot cpu */
1478 prom_printf("%x : starting cpu hw idx %x... ", cpuid
, reg
);
1479 call_prom("start-cpu", 3, 0, node
,
1480 secondary_hold
, reg
);
1482 for (i
= 0; (i
< 100000000) &&
1483 (*acknowledge
== ((unsigned long)-1)); i
++ )
1486 if (*acknowledge
== reg
)
1487 prom_printf("done\n");
1489 prom_printf("failed: %x\n", *acknowledge
);
1493 prom_printf("%x : boot cpu %x\n", cpuid
, reg
);
1494 #endif /* CONFIG_SMP */
1496 /* Reserve cpu #s for secondary threads. They start later. */
1497 cpuid
+= cpu_threads
;
1500 if (cpuid
> NR_CPUS
)
1501 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS
)
1502 ") exceeded: ignoring extras\n");
1504 prom_debug("prom_hold_cpus: end...\n");
1508 static void __init
prom_init_client_services(unsigned long pp
)
1510 struct prom_t
*_prom
= &RELOC(prom
);
1512 /* Get a handle to the prom entry point before anything else */
1513 RELOC(prom_entry
) = pp
;
1515 /* get a handle for the stdout device */
1516 _prom
->chosen
= call_prom("finddevice", 1, 1, ADDR("/chosen"));
1517 if (!PHANDLE_VALID(_prom
->chosen
))
1518 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1520 /* get device tree root */
1521 _prom
->root
= call_prom("finddevice", 1, 1, ADDR("/"));
1522 if (!PHANDLE_VALID(_prom
->root
))
1523 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1530 * For really old powermacs, we need to map things we claim.
1531 * For that, we need the ihandle of the mmu.
1532 * Also, on the longtrail, we need to work around other bugs.
1534 static void __init
prom_find_mmu(void)
1536 struct prom_t
*_prom
= &RELOC(prom
);
1540 oprom
= call_prom("finddevice", 1, 1, ADDR("/openprom"));
1541 if (!PHANDLE_VALID(oprom
))
1543 if (prom_getprop(oprom
, "model", version
, sizeof(version
)) <= 0)
1545 version
[sizeof(version
) - 1] = 0;
1546 /* XXX might need to add other versions here */
1547 if (strcmp(version
, "Open Firmware, 1.0.5") == 0)
1548 of_workarounds
= OF_WA_CLAIM
;
1549 else if (strncmp(version
, "FirmWorks,3.", 12) == 0) {
1550 of_workarounds
= OF_WA_CLAIM
| OF_WA_LONGTRAIL
;
1551 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1554 _prom
->memory
= call_prom("open", 1, 1, ADDR("/memory"));
1555 prom_getprop(_prom
->chosen
, "mmu", &_prom
->mmumap
,
1556 sizeof(_prom
->mmumap
));
1557 if (!IHANDLE_VALID(_prom
->memory
) || !IHANDLE_VALID(_prom
->mmumap
))
1558 of_workarounds
&= ~OF_WA_CLAIM
; /* hmmm */
1561 #define prom_find_mmu()
1564 static void __init
prom_init_stdout(void)
1566 struct prom_t
*_prom
= &RELOC(prom
);
1567 char *path
= RELOC(of_stdout_device
);
1571 if (prom_getprop(_prom
->chosen
, "stdout", &val
, sizeof(val
)) <= 0)
1572 prom_panic("cannot find stdout");
1574 _prom
->stdout
= val
;
1576 /* Get the full OF pathname of the stdout device */
1577 memset(path
, 0, 256);
1578 call_prom("instance-to-path", 3, 1, _prom
->stdout
, path
, 255);
1579 val
= call_prom("instance-to-package", 1, 1, _prom
->stdout
);
1580 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-package",
1582 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device
));
1583 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-path",
1584 path
, strlen(path
) + 1);
1586 /* If it's a display, note it */
1587 memset(type
, 0, sizeof(type
));
1588 prom_getprop(val
, "device_type", type
, sizeof(type
));
1589 if (strcmp(type
, RELOC("display")) == 0)
1590 prom_setprop(val
, path
, "linux,boot-display", NULL
, 0);
1593 static void __init
prom_close_stdin(void)
1595 struct prom_t
*_prom
= &RELOC(prom
);
1598 if (prom_getprop(_prom
->chosen
, "stdin", &val
, sizeof(val
)) > 0)
1599 call_prom("close", 1, 0, val
);
1602 static int __init
prom_find_machine_type(void)
1604 struct prom_t
*_prom
= &RELOC(prom
);
1612 /* Look for a PowerMac */
1613 len
= prom_getprop(_prom
->root
, "compatible",
1614 compat
, sizeof(compat
)-1);
1618 char *p
= &compat
[i
];
1622 if (strstr(p
, RELOC("Power Macintosh")) ||
1623 strstr(p
, RELOC("MacRISC")))
1624 return PLATFORM_POWERMAC
;
1629 /* If not a mac, try to figure out if it's an IBM pSeries or any other
1630 * PAPR compliant platform. We assume it is if :
1631 * - /device_type is "chrp" (please, do NOT use that for future
1635 len
= prom_getprop(_prom
->root
, "device_type",
1636 compat
, sizeof(compat
)-1);
1638 return PLATFORM_GENERIC
;
1639 if (strcmp(compat
, RELOC("chrp")))
1640 return PLATFORM_GENERIC
;
1642 /* Default to pSeries. We need to know if we are running LPAR */
1643 rtas
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1644 if (!PHANDLE_VALID(rtas
))
1645 return PLATFORM_GENERIC
;
1646 x
= prom_getproplen(rtas
, "ibm,hypertas-functions");
1647 if (x
!= PROM_ERROR
) {
1648 prom_printf("Hypertas detected, assuming LPAR !\n");
1649 return PLATFORM_PSERIES_LPAR
;
1651 return PLATFORM_PSERIES
;
1653 return PLATFORM_GENERIC
;
1657 static int __init
prom_set_color(ihandle ih
, int i
, int r
, int g
, int b
)
1659 return call_prom("call-method", 6, 1, ADDR("color!"), ih
, i
, b
, g
, r
);
1663 * If we have a display that we don't know how to drive,
1664 * we will want to try to execute OF's open method for it
1665 * later. However, OF will probably fall over if we do that
1666 * we've taken over the MMU.
1667 * So we check whether we will need to open the display,
1668 * and if so, open it now.
1670 static void __init
prom_check_displays(void)
1672 char type
[16], *path
;
1677 static unsigned char default_colors
[] = {
1695 const unsigned char *clut
;
1697 prom_printf("Looking for displays\n");
1698 for (node
= 0; prom_next_node(&node
); ) {
1699 memset(type
, 0, sizeof(type
));
1700 prom_getprop(node
, "device_type", type
, sizeof(type
));
1701 if (strcmp(type
, RELOC("display")) != 0)
1704 /* It seems OF doesn't null-terminate the path :-( */
1705 path
= RELOC(prom_scratch
);
1706 memset(path
, 0, PROM_SCRATCH_SIZE
);
1709 * leave some room at the end of the path for appending extra
1712 if (call_prom("package-to-path", 3, 1, node
, path
,
1713 PROM_SCRATCH_SIZE
-10) == PROM_ERROR
)
1715 prom_printf("found display : %s, opening ... ", path
);
1717 ih
= call_prom("open", 1, 1, path
);
1719 prom_printf("failed\n");
1724 prom_printf("done\n");
1725 prom_setprop(node
, path
, "linux,opened", NULL
, 0);
1727 /* Setup a usable color table when the appropriate
1728 * method is available. Should update this to set-colors */
1729 clut
= RELOC(default_colors
);
1730 for (i
= 0; i
< 32; i
++, clut
+= 3)
1731 if (prom_set_color(ih
, i
, clut
[0], clut
[1],
1735 #ifdef CONFIG_LOGO_LINUX_CLUT224
1736 clut
= PTRRELOC(RELOC(logo_linux_clut224
.clut
));
1737 for (i
= 0; i
< RELOC(logo_linux_clut224
.clutsize
); i
++, clut
+= 3)
1738 if (prom_set_color(ih
, i
+ 32, clut
[0], clut
[1],
1741 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1746 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1747 static void __init
*make_room(unsigned long *mem_start
, unsigned long *mem_end
,
1748 unsigned long needed
, unsigned long align
)
1752 *mem_start
= _ALIGN(*mem_start
, align
);
1753 while ((*mem_start
+ needed
) > *mem_end
) {
1754 unsigned long room
, chunk
;
1756 prom_debug("Chunk exhausted, claiming more at %x...\n",
1757 RELOC(alloc_bottom
));
1758 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
);
1759 if (room
> DEVTREE_CHUNK_SIZE
)
1760 room
= DEVTREE_CHUNK_SIZE
;
1761 if (room
< PAGE_SIZE
)
1762 prom_panic("No memory for flatten_device_tree (no room)");
1763 chunk
= alloc_up(room
, 0);
1765 prom_panic("No memory for flatten_device_tree (claim failed)");
1766 *mem_end
= RELOC(alloc_top
);
1769 ret
= (void *)*mem_start
;
1770 *mem_start
+= needed
;
1775 #define dt_push_token(token, mem_start, mem_end) \
1776 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1778 static unsigned long __init
dt_find_string(char *str
)
1782 s
= os
= (char *)RELOC(dt_string_start
);
1784 while (s
< (char *)RELOC(dt_string_end
)) {
1785 if (strcmp(s
, str
) == 0)
1793 * The Open Firmware 1275 specification states properties must be 31 bytes or
1794 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1796 #define MAX_PROPERTY_NAME 64
1798 static void __init
scan_dt_build_strings(phandle node
,
1799 unsigned long *mem_start
,
1800 unsigned long *mem_end
)
1802 char *prev_name
, *namep
, *sstart
;
1806 sstart
= (char *)RELOC(dt_string_start
);
1808 /* get and store all property names */
1809 prev_name
= RELOC("");
1811 /* 64 is max len of name including nul. */
1812 namep
= make_room(mem_start
, mem_end
, MAX_PROPERTY_NAME
, 1);
1813 if (call_prom("nextprop", 3, 1, node
, prev_name
, namep
) != 1) {
1814 /* No more nodes: unwind alloc */
1815 *mem_start
= (unsigned long)namep
;
1820 if (strcmp(namep
, RELOC("name")) == 0) {
1821 *mem_start
= (unsigned long)namep
;
1822 prev_name
= RELOC("name");
1825 /* get/create string entry */
1826 soff
= dt_find_string(namep
);
1828 *mem_start
= (unsigned long)namep
;
1829 namep
= sstart
+ soff
;
1831 /* Trim off some if we can */
1832 *mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1833 RELOC(dt_string_end
) = *mem_start
;
1838 /* do all our children */
1839 child
= call_prom("child", 1, 1, node
);
1840 while (child
!= 0) {
1841 scan_dt_build_strings(child
, mem_start
, mem_end
);
1842 child
= call_prom("peer", 1, 1, child
);
1846 static void __init
scan_dt_build_struct(phandle node
, unsigned long *mem_start
,
1847 unsigned long *mem_end
)
1850 char *namep
, *prev_name
, *sstart
, *p
, *ep
, *lp
, *path
;
1852 unsigned char *valp
;
1853 static char pname
[MAX_PROPERTY_NAME
];
1856 dt_push_token(OF_DT_BEGIN_NODE
, mem_start
, mem_end
);
1858 /* get the node's full name */
1859 namep
= (char *)*mem_start
;
1860 room
= *mem_end
- *mem_start
;
1863 l
= call_prom("package-to-path", 3, 1, node
, namep
, room
);
1865 /* Didn't fit? Get more room. */
1867 if (l
>= *mem_end
- *mem_start
)
1868 namep
= make_room(mem_start
, mem_end
, l
+1, 1);
1869 call_prom("package-to-path", 3, 1, node
, namep
, l
);
1873 /* Fixup an Apple bug where they have bogus \0 chars in the
1874 * middle of the path in some properties, and extract
1875 * the unit name (everything after the last '/').
1877 for (lp
= p
= namep
, ep
= namep
+ l
; p
< ep
; p
++) {
1884 *mem_start
= _ALIGN((unsigned long)lp
+ 1, 4);
1887 /* get it again for debugging */
1888 path
= RELOC(prom_scratch
);
1889 memset(path
, 0, PROM_SCRATCH_SIZE
);
1890 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1892 /* get and store all properties */
1893 prev_name
= RELOC("");
1894 sstart
= (char *)RELOC(dt_string_start
);
1896 if (call_prom("nextprop", 3, 1, node
, prev_name
,
1901 if (strcmp(RELOC(pname
), RELOC("name")) == 0) {
1902 prev_name
= RELOC("name");
1906 /* find string offset */
1907 soff
= dt_find_string(RELOC(pname
));
1909 prom_printf("WARNING: Can't find string index for"
1910 " <%s>, node %s\n", RELOC(pname
), path
);
1913 prev_name
= sstart
+ soff
;
1916 l
= call_prom("getproplen", 2, 1, node
, RELOC(pname
));
1919 if (l
== PROM_ERROR
)
1921 if (l
> MAX_PROPERTY_LENGTH
) {
1922 prom_printf("WARNING: ignoring large property ");
1923 /* It seems OF doesn't null-terminate the path :-( */
1924 prom_printf("[%s] ", path
);
1925 prom_printf("%s length 0x%x\n", RELOC(pname
), l
);
1929 /* push property head */
1930 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1931 dt_push_token(l
, mem_start
, mem_end
);
1932 dt_push_token(soff
, mem_start
, mem_end
);
1934 /* push property content */
1935 valp
= make_room(mem_start
, mem_end
, l
, 4);
1936 call_prom("getprop", 4, 1, node
, RELOC(pname
), valp
, l
);
1937 *mem_start
= _ALIGN(*mem_start
, 4);
1940 /* Add a "linux,phandle" property. */
1941 soff
= dt_find_string(RELOC("linux,phandle"));
1943 prom_printf("WARNING: Can't find string index for"
1944 " <linux-phandle> node %s\n", path
);
1946 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1947 dt_push_token(4, mem_start
, mem_end
);
1948 dt_push_token(soff
, mem_start
, mem_end
);
1949 valp
= make_room(mem_start
, mem_end
, 4, 4);
1950 *(u32
*)valp
= node
;
1953 /* do all our children */
1954 child
= call_prom("child", 1, 1, node
);
1955 while (child
!= 0) {
1956 scan_dt_build_struct(child
, mem_start
, mem_end
);
1957 child
= call_prom("peer", 1, 1, child
);
1960 dt_push_token(OF_DT_END_NODE
, mem_start
, mem_end
);
1963 static void __init
flatten_device_tree(void)
1966 unsigned long mem_start
, mem_end
, room
;
1967 struct boot_param_header
*hdr
;
1968 struct prom_t
*_prom
= &RELOC(prom
);
1973 * Check how much room we have between alloc top & bottom (+/- a
1974 * few pages), crop to 4Mb, as this is our "chuck" size
1976 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
) - 0x4000;
1977 if (room
> DEVTREE_CHUNK_SIZE
)
1978 room
= DEVTREE_CHUNK_SIZE
;
1979 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom
));
1981 /* Now try to claim that */
1982 mem_start
= (unsigned long)alloc_up(room
, PAGE_SIZE
);
1984 prom_panic("Can't allocate initial device-tree chunk\n");
1985 mem_end
= RELOC(alloc_top
);
1987 /* Get root of tree */
1988 root
= call_prom("peer", 1, 1, (phandle
)0);
1989 if (root
== (phandle
)0)
1990 prom_panic ("couldn't get device tree root\n");
1992 /* Build header and make room for mem rsv map */
1993 mem_start
= _ALIGN(mem_start
, 4);
1994 hdr
= make_room(&mem_start
, &mem_end
,
1995 sizeof(struct boot_param_header
), 4);
1996 RELOC(dt_header_start
) = (unsigned long)hdr
;
1997 rsvmap
= make_room(&mem_start
, &mem_end
, sizeof(mem_reserve_map
), 8);
1999 /* Start of strings */
2000 mem_start
= PAGE_ALIGN(mem_start
);
2001 RELOC(dt_string_start
) = mem_start
;
2002 mem_start
+= 4; /* hole */
2004 /* Add "linux,phandle" in there, we'll need it */
2005 namep
= make_room(&mem_start
, &mem_end
, 16, 1);
2006 strcpy(namep
, RELOC("linux,phandle"));
2007 mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
2009 /* Build string array */
2010 prom_printf("Building dt strings...\n");
2011 scan_dt_build_strings(root
, &mem_start
, &mem_end
);
2012 RELOC(dt_string_end
) = mem_start
;
2014 /* Build structure */
2015 mem_start
= PAGE_ALIGN(mem_start
);
2016 RELOC(dt_struct_start
) = mem_start
;
2017 prom_printf("Building dt structure...\n");
2018 scan_dt_build_struct(root
, &mem_start
, &mem_end
);
2019 dt_push_token(OF_DT_END
, &mem_start
, &mem_end
);
2020 RELOC(dt_struct_end
) = PAGE_ALIGN(mem_start
);
2023 hdr
->boot_cpuid_phys
= _prom
->cpu
;
2024 hdr
->magic
= OF_DT_HEADER
;
2025 hdr
->totalsize
= RELOC(dt_struct_end
) - RELOC(dt_header_start
);
2026 hdr
->off_dt_struct
= RELOC(dt_struct_start
) - RELOC(dt_header_start
);
2027 hdr
->off_dt_strings
= RELOC(dt_string_start
) - RELOC(dt_header_start
);
2028 hdr
->dt_strings_size
= RELOC(dt_string_end
) - RELOC(dt_string_start
);
2029 hdr
->off_mem_rsvmap
= ((unsigned long)rsvmap
) - RELOC(dt_header_start
);
2030 hdr
->version
= OF_DT_VERSION
;
2031 /* Version 16 is not backward compatible */
2032 hdr
->last_comp_version
= 0x10;
2034 /* Reserve the whole thing and copy the reserve map in, we
2035 * also bump mem_reserve_cnt to cause further reservations to
2036 * fail since it's too late.
2038 reserve_mem(RELOC(dt_header_start
), hdr
->totalsize
);
2039 memcpy(rsvmap
, RELOC(mem_reserve_map
), sizeof(mem_reserve_map
));
2044 prom_printf("reserved memory map:\n");
2045 for (i
= 0; i
< RELOC(mem_reserve_cnt
); i
++)
2046 prom_printf(" %x - %x\n",
2047 RELOC(mem_reserve_map
)[i
].base
,
2048 RELOC(mem_reserve_map
)[i
].size
);
2051 RELOC(mem_reserve_cnt
) = MEM_RESERVE_MAP_SIZE
;
2053 prom_printf("Device tree strings 0x%x -> 0x%x\n",
2054 RELOC(dt_string_start
), RELOC(dt_string_end
));
2055 prom_printf("Device tree struct 0x%x -> 0x%x\n",
2056 RELOC(dt_struct_start
), RELOC(dt_struct_end
));
2060 #ifdef CONFIG_PPC_MAPLE
2061 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
2062 * The values are bad, and it doesn't even have the right number of cells. */
2063 static void __init
fixup_device_tree_maple(void)
2068 isa
= call_prom("finddevice", 1, 1, ADDR("/ht@0/isa@4"));
2069 if (!PHANDLE_VALID(isa
))
2072 if (prom_getprop(isa
, "ranges", isa_ranges
, sizeof(isa_ranges
))
2076 if (isa_ranges
[0] != 0x1 ||
2077 isa_ranges
[1] != 0xf4000000 ||
2078 isa_ranges
[2] != 0x00010000)
2081 prom_printf("fixing up bogus ISA range on Maple...\n");
2083 isa_ranges
[0] = 0x1;
2084 isa_ranges
[1] = 0x0;
2085 isa_ranges
[2] = 0x01002000; /* IO space; PCI device = 4 */
2086 isa_ranges
[3] = 0x0;
2087 isa_ranges
[4] = 0x0;
2088 isa_ranges
[5] = 0x00010000;
2089 prom_setprop(isa
, "/ht@0/isa@4", "ranges",
2090 isa_ranges
, sizeof(isa_ranges
));
2093 #define fixup_device_tree_maple()
2096 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2097 static void __init
fixup_device_tree_pmac(void)
2099 phandle u3
, i2c
, mpic
;
2104 /* Some G5s have a missing interrupt definition, fix it up here */
2105 u3
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2106 if (!PHANDLE_VALID(u3
))
2108 i2c
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2109 if (!PHANDLE_VALID(i2c
))
2111 mpic
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2112 if (!PHANDLE_VALID(mpic
))
2115 /* check if proper rev of u3 */
2116 if (prom_getprop(u3
, "device-rev", &u3_rev
, sizeof(u3_rev
))
2119 if (u3_rev
< 0x35 || u3_rev
> 0x39)
2121 /* does it need fixup ? */
2122 if (prom_getproplen(i2c
, "interrupts") > 0)
2125 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2127 /* interrupt on this revision of u3 is number 0 and level */
2130 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2131 &interrupts
, sizeof(interrupts
));
2133 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2134 &parent
, sizeof(parent
));
2137 #define fixup_device_tree_pmac()
2140 static void __init
fixup_device_tree(void)
2142 fixup_device_tree_maple();
2143 fixup_device_tree_pmac();
2146 static void __init
prom_find_boot_cpu(void)
2148 struct prom_t
*_prom
= &RELOC(prom
);
2154 if (prom_getprop(_prom
->chosen
, "cpu", &prom_cpu
, sizeof(prom_cpu
)) <= 0)
2157 cpu_pkg
= call_prom("instance-to-package", 1, 1, prom_cpu
);
2159 prom_getprop(cpu_pkg
, "reg", &getprop_rval
, sizeof(getprop_rval
));
2160 _prom
->cpu
= getprop_rval
;
2162 prom_debug("Booting CPU hw index = 0x%x\n", _prom
->cpu
);
2165 static void __init
prom_check_initrd(unsigned long r3
, unsigned long r4
)
2167 #ifdef CONFIG_BLK_DEV_INITRD
2168 struct prom_t
*_prom
= &RELOC(prom
);
2170 if (r3
&& r4
&& r4
!= 0xdeadbeef) {
2173 RELOC(prom_initrd_start
) = is_kernel_addr(r3
) ? __pa(r3
) : r3
;
2174 RELOC(prom_initrd_end
) = RELOC(prom_initrd_start
) + r4
;
2176 val
= RELOC(prom_initrd_start
);
2177 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-start",
2179 val
= RELOC(prom_initrd_end
);
2180 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-end",
2183 reserve_mem(RELOC(prom_initrd_start
),
2184 RELOC(prom_initrd_end
) - RELOC(prom_initrd_start
));
2186 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start
));
2187 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end
));
2189 #endif /* CONFIG_BLK_DEV_INITRD */
2193 * We enter here early on, when the Open Firmware prom is still
2194 * handling exceptions and the MMU hash table for us.
2197 unsigned long __init
prom_init(unsigned long r3
, unsigned long r4
,
2199 unsigned long r6
, unsigned long r7
)
2201 struct prom_t
*_prom
;
2203 unsigned long offset
= reloc_offset();
2209 _prom
= &RELOC(prom
);
2212 * First zero the BSS
2214 memset(&RELOC(__bss_start
), 0, __bss_stop
- __bss_start
);
2217 * Init interface to Open Firmware, get some node references,
2220 prom_init_client_services(pp
);
2223 * See if this OF is old enough that we need to do explicit maps
2224 * and other workarounds
2229 * Init prom stdout device
2234 * Get default machine type. At this point, we do not differentiate
2235 * between pSeries SMP and pSeries LPAR
2237 RELOC(of_platform
) = prom_find_machine_type();
2239 /* Bail if this is a kdump kernel. */
2240 if (PHYSICAL_START
> 0)
2241 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2244 * Check for an initrd
2246 prom_check_initrd(r3
, r4
);
2248 #ifdef CONFIG_PPC_PSERIES
2250 * On pSeries, inform the firmware about our capabilities
2252 if (RELOC(of_platform
) == PLATFORM_PSERIES
||
2253 RELOC(of_platform
) == PLATFORM_PSERIES_LPAR
)
2254 prom_send_capabilities();
2258 * Copy the CPU hold code
2260 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2261 copy_and_flush(0, KERNELBASE
+ offset
, 0x100, 0);
2264 * Do early parsing of command line
2266 early_cmdline_parse();
2269 * Initialize memory management within prom_init
2274 if (RELOC(prom_crashk_base
))
2275 reserve_mem(RELOC(prom_crashk_base
), RELOC(prom_crashk_size
));
2278 * Determine which cpu is actually running right _now_
2280 prom_find_boot_cpu();
2283 * Initialize display devices
2285 prom_check_displays();
2289 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2290 * that uses the allocator, we need to make sure we get the top of memory
2291 * available for us here...
2293 if (RELOC(of_platform
) == PLATFORM_PSERIES
)
2294 prom_initialize_tce_table();
2298 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2299 * in spin-loops. PowerMacs don't have a working RTAS and use
2300 * a different way to spin CPUs
2302 if (RELOC(of_platform
) != PLATFORM_POWERMAC
) {
2303 prom_instantiate_rtas();
2308 * Fill in some infos for use by the kernel later on
2310 if (RELOC(prom_memory_limit
))
2311 prom_setprop(_prom
->chosen
, "/chosen", "linux,memory-limit",
2312 &RELOC(prom_memory_limit
),
2313 sizeof(prom_memory_limit
));
2315 if (RELOC(ppc64_iommu_off
))
2316 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-off",
2319 if (RELOC(iommu_force_on
))
2320 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-force-on",
2323 if (RELOC(prom_tce_alloc_start
)) {
2324 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-start",
2325 &RELOC(prom_tce_alloc_start
),
2326 sizeof(prom_tce_alloc_start
));
2327 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-end",
2328 &RELOC(prom_tce_alloc_end
),
2329 sizeof(prom_tce_alloc_end
));
2334 if (RELOC(prom_crashk_base
)) {
2335 prom_setprop(_prom
->chosen
, "/chosen", "linux,crashkernel-base",
2336 PTRRELOC(&prom_crashk_base
),
2337 sizeof(RELOC(prom_crashk_base
)));
2338 prom_setprop(_prom
->chosen
, "/chosen", "linux,crashkernel-size",
2339 PTRRELOC(&prom_crashk_size
),
2340 sizeof(RELOC(prom_crashk_size
)));
2344 * Fixup any known bugs in the device-tree
2346 fixup_device_tree();
2349 * Now finally create the flattened device-tree
2351 prom_printf("copying OF device tree ...\n");
2352 flatten_device_tree();
2355 * in case stdin is USB and still active on IBM machines...
2356 * Unfortunately quiesce crashes on some powermacs if we have
2357 * closed stdin already (in particular the powerbook 101).
2359 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2363 * Call OF "quiesce" method to shut down pending DMA's from
2366 prom_printf("Calling quiesce ...\n");
2367 call_prom("quiesce", 0, 0);
2370 * And finally, call the kernel passing it the flattened device
2371 * tree and NULL as r5, thus triggering the new entry point which
2372 * is common to us and kexec
2374 hdr
= RELOC(dt_header_start
);
2375 prom_printf("returning from prom_init\n");
2376 prom_debug("->dt_header_start=0x%x\n", hdr
);
2379 reloc_got2(-offset
);
2382 __start(hdr
, KERNELBASE
+ offset
, 0);