2 * Procedures for interfacing to Open Firmware.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/proc_fs.h>
27 #include <linux/stringify.h>
28 #include <linux/delay.h>
29 #include <linux/initrd.h>
30 #include <linux/bitops.h>
34 #include <asm/processor.h>
38 #include <asm/system.h>
40 #include <asm/pgtable.h>
42 #include <asm/iommu.h>
43 #include <asm/btext.h>
44 #include <asm/sections.h>
45 #include <asm/machdep.h>
47 #ifdef CONFIG_LOGO_LINUX_CLUT224
48 #include <linux/linux_logo.h>
49 extern const struct linux_logo logo_linux_clut224
;
53 * Properties whose value is longer than this get excluded from our
54 * copy of the device tree. This value does need to be big enough to
55 * ensure that we don't lose things like the interrupt-map property
56 * on a PCI-PCI bridge.
58 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024)
61 * Eventually bump that one up
63 #define DEVTREE_CHUNK_SIZE 0x100000
66 * This is the size of the local memory reserve map that gets copied
67 * into the boot params passed to the kernel. That size is totally
68 * flexible as the kernel just reads the list until it encounters an
69 * entry with size 0, so it can be changed without breaking binary
72 #define MEM_RESERVE_MAP_SIZE 8
75 * prom_init() is called very early on, before the kernel text
76 * and data have been mapped to KERNELBASE. At this point the code
77 * is running at whatever address it has been loaded at.
78 * On ppc32 we compile with -mrelocatable, which means that references
79 * to extern and static variables get relocated automatically.
80 * On ppc64 we have to relocate the references explicitly with
81 * RELOC. (Note that strings count as static variables.)
83 * Because OF may have mapped I/O devices into the area starting at
84 * KERNELBASE, particularly on CHRP machines, we can't safely call
85 * OF once the kernel has been mapped to KERNELBASE. Therefore all
86 * OF calls must be done within prom_init().
88 * ADDR is used in calls to call_prom. The 4th and following
89 * arguments to call_prom should be 32-bit values.
90 * On ppc64, 64 bit values are truncated to 32 bits (and
91 * fortunately don't get interpreted as two arguments).
94 #define RELOC(x) (*PTRRELOC(&(x)))
95 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x))
96 #define OF_WORKAROUNDS 0
99 #define ADDR(x) (u32) (x)
100 #define OF_WORKAROUNDS of_workarounds
104 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */
105 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */
107 #define PROM_BUG() do { \
108 prom_printf("kernel BUG at %s line 0x%x!\n", \
109 RELOC(__FILE__), __LINE__); \
110 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \
114 #define prom_debug(x...) prom_printf(x)
116 #define prom_debug(x...)
120 typedef u32 prom_arg_t
;
138 struct mem_map_entry
{
145 extern void __start(unsigned long r3
, unsigned long r4
, unsigned long r5
);
148 extern int enter_prom(struct prom_args
*args
, unsigned long entry
);
150 static inline int enter_prom(struct prom_args
*args
, unsigned long entry
)
152 return ((int (*)(struct prom_args
*))entry
)(args
);
156 extern void copy_and_flush(unsigned long dest
, unsigned long src
,
157 unsigned long size
, unsigned long offset
);
160 static struct prom_t __initdata prom
;
162 static unsigned long prom_entry __initdata
;
164 #define PROM_SCRATCH_SIZE 256
166 static char __initdata of_stdout_device
[256];
167 static char __initdata prom_scratch
[PROM_SCRATCH_SIZE
];
169 static unsigned long __initdata dt_header_start
;
170 static unsigned long __initdata dt_struct_start
, dt_struct_end
;
171 static unsigned long __initdata dt_string_start
, dt_string_end
;
173 static unsigned long __initdata prom_initrd_start
, prom_initrd_end
;
176 static int __initdata prom_iommu_force_on
;
177 static int __initdata prom_iommu_off
;
178 static unsigned long __initdata prom_tce_alloc_start
;
179 static unsigned long __initdata prom_tce_alloc_end
;
182 /* Platforms codes are now obsolete in the kernel. Now only used within this
183 * file and ultimately gone too. Feel free to change them if you need, they
184 * are not shared with anything outside of this file anymore
186 #define PLATFORM_PSERIES 0x0100
187 #define PLATFORM_PSERIES_LPAR 0x0101
188 #define PLATFORM_LPAR 0x0001
189 #define PLATFORM_POWERMAC 0x0400
190 #define PLATFORM_GENERIC 0x0500
192 static int __initdata of_platform
;
194 static char __initdata prom_cmd_line
[COMMAND_LINE_SIZE
];
196 static unsigned long __initdata alloc_top
;
197 static unsigned long __initdata alloc_top_high
;
198 static unsigned long __initdata alloc_bottom
;
199 static unsigned long __initdata rmo_top
;
200 static unsigned long __initdata ram_top
;
202 static struct mem_map_entry __initdata mem_reserve_map
[MEM_RESERVE_MAP_SIZE
];
203 static int __initdata mem_reserve_cnt
;
205 static cell_t __initdata regbuf
[1024];
209 * Error results ... some OF calls will return "-1" on error, some
210 * will return 0, some will return either. To simplify, here are
211 * macros to use with any ihandle or phandle return value to check if
215 #define PROM_ERROR (-1u)
216 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
217 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
220 /* This is the one and *ONLY* place where we actually call open
224 static int __init
call_prom(const char *service
, int nargs
, int nret
, ...)
227 struct prom_args args
;
230 args
.service
= ADDR(service
);
234 va_start(list
, nret
);
235 for (i
= 0; i
< nargs
; i
++)
236 args
.args
[i
] = va_arg(list
, prom_arg_t
);
239 for (i
= 0; i
< nret
; i
++)
240 args
.args
[nargs
+i
] = 0;
242 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
245 return (nret
> 0) ? args
.args
[nargs
] : 0;
248 static int __init
call_prom_ret(const char *service
, int nargs
, int nret
,
249 prom_arg_t
*rets
, ...)
252 struct prom_args args
;
255 args
.service
= ADDR(service
);
259 va_start(list
, rets
);
260 for (i
= 0; i
< nargs
; i
++)
261 args
.args
[i
] = va_arg(list
, prom_arg_t
);
264 for (i
= 0; i
< nret
; i
++)
265 args
.args
[nargs
+i
] = 0;
267 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
271 for (i
= 1; i
< nret
; ++i
)
272 rets
[i
-1] = args
.args
[nargs
+i
];
274 return (nret
> 0) ? args
.args
[nargs
] : 0;
278 static void __init
prom_print(const char *msg
)
281 struct prom_t
*_prom
= &RELOC(prom
);
283 if (_prom
->stdout
== 0)
286 for (p
= msg
; *p
!= 0; p
= q
) {
287 for (q
= p
; *q
!= 0 && *q
!= '\n'; ++q
)
290 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
294 call_prom("write", 3, 1, _prom
->stdout
, ADDR("\r\n"), 2);
299 static void __init
prom_print_hex(unsigned long val
)
301 int i
, nibbles
= sizeof(val
)*2;
302 char buf
[sizeof(val
)*2+1];
303 struct prom_t
*_prom
= &RELOC(prom
);
305 for (i
= nibbles
-1; i
>= 0; i
--) {
306 buf
[i
] = (val
& 0xf) + '0';
308 buf
[i
] += ('a'-'0'-10);
312 call_prom("write", 3, 1, _prom
->stdout
, buf
, nibbles
);
316 static void __init
prom_printf(const char *format
, ...)
318 const char *p
, *q
, *s
;
321 struct prom_t
*_prom
= &RELOC(prom
);
323 va_start(args
, format
);
325 format
= PTRRELOC(format
);
327 for (p
= format
; *p
!= 0; p
= q
) {
328 for (q
= p
; *q
!= 0 && *q
!= '\n' && *q
!= '%'; ++q
)
331 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
336 call_prom("write", 3, 1, _prom
->stdout
,
346 s
= va_arg(args
, const char *);
351 v
= va_arg(args
, unsigned long);
359 static unsigned int __init
prom_claim(unsigned long virt
, unsigned long size
,
362 struct prom_t
*_prom
= &RELOC(prom
);
364 if (align
== 0 && (OF_WORKAROUNDS
& OF_WA_CLAIM
)) {
366 * Old OF requires we claim physical and virtual separately
367 * and then map explicitly (assuming virtual mode)
372 ret
= call_prom_ret("call-method", 5, 2, &result
,
373 ADDR("claim"), _prom
->memory
,
375 if (ret
!= 0 || result
== -1)
377 ret
= call_prom_ret("call-method", 5, 2, &result
,
378 ADDR("claim"), _prom
->mmumap
,
381 call_prom("call-method", 4, 1, ADDR("release"),
382 _prom
->memory
, size
, virt
);
385 /* the 0x12 is M (coherence) + PP == read/write */
386 call_prom("call-method", 6, 1,
387 ADDR("map"), _prom
->mmumap
, 0x12, size
, virt
, virt
);
390 return call_prom("claim", 3, 1, (prom_arg_t
)virt
, (prom_arg_t
)size
,
394 static void __init
__attribute__((noreturn
)) prom_panic(const char *reason
)
397 reason
= PTRRELOC(reason
);
400 /* Do not call exit because it clears the screen on pmac
401 * it also causes some sort of double-fault on early pmacs */
402 if (RELOC(of_platform
) == PLATFORM_POWERMAC
)
405 /* ToDo: should put up an SRC here on p/iSeries */
406 call_prom("exit", 0, 0);
408 for (;;) /* should never get here */
413 static int __init
prom_next_node(phandle
*nodep
)
417 if ((node
= *nodep
) != 0
418 && (*nodep
= call_prom("child", 1, 1, node
)) != 0)
420 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
423 if ((node
= call_prom("parent", 1, 1, node
)) == 0)
425 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
430 static int inline prom_getprop(phandle node
, const char *pname
,
431 void *value
, size_t valuelen
)
433 return call_prom("getprop", 4, 1, node
, ADDR(pname
),
434 (u32
)(unsigned long) value
, (u32
) valuelen
);
437 static int inline prom_getproplen(phandle node
, const char *pname
)
439 return call_prom("getproplen", 2, 1, node
, ADDR(pname
));
442 static void add_string(char **str
, const char *q
)
452 static char *tohex(unsigned int x
)
454 static char digits
[] = "0123456789abcdef";
455 static char result
[9];
462 result
[i
] = digits
[x
& 0xf];
464 } while (x
!= 0 && i
> 0);
468 static int __init
prom_setprop(phandle node
, const char *nodename
,
469 const char *pname
, void *value
, size_t valuelen
)
473 if (!(OF_WORKAROUNDS
& OF_WA_LONGTRAIL
))
474 return call_prom("setprop", 4, 1, node
, ADDR(pname
),
475 (u32
)(unsigned long) value
, (u32
) valuelen
);
477 /* gah... setprop doesn't work on longtrail, have to use interpret */
479 add_string(&p
, "dev");
480 add_string(&p
, nodename
);
481 add_string(&p
, tohex((u32
)(unsigned long) value
));
482 add_string(&p
, tohex(valuelen
));
483 add_string(&p
, tohex(ADDR(pname
)));
484 add_string(&p
, tohex(strlen(RELOC(pname
))));
485 add_string(&p
, "property");
487 return call_prom("interpret", 1, 1, (u32
)(unsigned long) cmd
);
490 /* We can't use the standard versions because of RELOC headaches. */
491 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
492 || ('a' <= (c) && (c) <= 'f') \
493 || ('A' <= (c) && (c) <= 'F'))
495 #define isdigit(c) ('0' <= (c) && (c) <= '9')
496 #define islower(c) ('a' <= (c) && (c) <= 'z')
497 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
499 unsigned long prom_strtoul(const char *cp
, const char **endp
)
501 unsigned long result
= 0, base
= 10, value
;
506 if (toupper(*cp
) == 'X') {
512 while (isxdigit(*cp
) &&
513 (value
= isdigit(*cp
) ? *cp
- '0' : toupper(*cp
) - 'A' + 10) < base
) {
514 result
= result
* base
+ value
;
524 unsigned long prom_memparse(const char *ptr
, const char **retptr
)
526 unsigned long ret
= prom_strtoul(ptr
, retptr
);
530 * We can't use a switch here because GCC *may* generate a
531 * jump table which won't work, because we're not running at
532 * the address we're linked at.
534 if ('G' == **retptr
|| 'g' == **retptr
)
537 if ('M' == **retptr
|| 'm' == **retptr
)
540 if ('K' == **retptr
|| 'k' == **retptr
)
552 * Early parsing of the command line passed to the kernel, used for
553 * "mem=x" and the options that affect the iommu
555 static void __init
early_cmdline_parse(void)
557 struct prom_t
*_prom
= &RELOC(prom
);
564 RELOC(prom_cmd_line
[0]) = 0;
565 p
= RELOC(prom_cmd_line
);
566 if ((long)_prom
->chosen
> 0)
567 l
= prom_getprop(_prom
->chosen
, "bootargs", p
, COMMAND_LINE_SIZE
-1);
568 #ifdef CONFIG_CMDLINE
569 if (l
<= 0 || p
[0] == '\0') /* dbl check */
570 strlcpy(RELOC(prom_cmd_line
),
571 RELOC(CONFIG_CMDLINE
), sizeof(prom_cmd_line
));
572 #endif /* CONFIG_CMDLINE */
573 prom_printf("command line: %s\n", RELOC(prom_cmd_line
));
576 opt
= strstr(RELOC(prom_cmd_line
), RELOC("iommu="));
578 prom_printf("iommu opt is: %s\n", opt
);
580 while (*opt
&& *opt
== ' ')
582 if (!strncmp(opt
, RELOC("off"), 3))
583 RELOC(prom_iommu_off
) = 1;
584 else if (!strncmp(opt
, RELOC("force"), 5))
585 RELOC(prom_iommu_force_on
) = 1;
590 #ifdef CONFIG_PPC_PSERIES
592 * There are two methods for telling firmware what our capabilities are.
593 * Newer machines have an "ibm,client-architecture-support" method on the
594 * root node. For older machines, we have to call the "process-elf-header"
595 * method in the /packages/elf-loader node, passing it a fake 32-bit
596 * ELF header containing a couple of PT_NOTE sections that contain
597 * structures that contain various information.
601 * New method - extensible architecture description vector.
603 * Because the description vector contains a mix of byte and word
604 * values, we declare it as an unsigned char array, and use this
605 * macro to put word values in.
607 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
608 ((x) >> 8) & 0xff, (x) & 0xff
610 /* Option vector bits - generic bits in byte 1 */
611 #define OV_IGNORE 0x80 /* ignore this vector */
612 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
614 /* Option vector 1: processor architectures supported */
615 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
616 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
617 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
618 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
619 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
620 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
621 #define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */
623 /* Option vector 2: Open Firmware options supported */
624 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */
626 /* Option vector 3: processor options supported */
627 #define OV3_FP 0x80 /* floating point */
628 #define OV3_VMX 0x40 /* VMX/Altivec */
629 #define OV3_DFP 0x20 /* decimal FP */
631 /* Option vector 5: PAPR/OF options supported */
632 #define OV5_LPAR 0x80 /* logical partitioning supported */
633 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
634 /* ibm,dynamic-reconfiguration-memory property supported */
635 #define OV5_DRCONF_MEMORY 0x20
636 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
637 #define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */
638 /* PCIe/MSI support. Without MSI full PCIe is not supported */
639 #ifdef CONFIG_PCI_MSI
640 #define OV5_MSI 0x01 /* PCIe/MSI support */
643 #endif /* CONFIG_PCI_MSI */
644 #ifdef CONFIG_PPC_SMLPAR
645 #define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */
651 * The architecture vector has an array of PVR mask/value pairs,
652 * followed by # option vectors - 1, followed by the option vectors.
654 static unsigned char ibm_architecture_vec
[] = {
655 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
656 W(0xffff0000), W(0x003e0000), /* POWER6 */
657 W(0xffff0000), W(0x003f0000), /* POWER7 */
658 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */
659 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */
660 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
661 5 - 1, /* 5 option vectors */
663 /* option vector 1: processor architectures supported */
665 0, /* don't ignore, don't halt */
666 OV1_PPC_2_00
| OV1_PPC_2_01
| OV1_PPC_2_02
| OV1_PPC_2_03
|
667 OV1_PPC_2_04
| OV1_PPC_2_05
| OV1_PPC_2_06
,
669 /* option vector 2: Open Firmware options supported */
673 W(0xffffffff), /* real_base */
674 W(0xffffffff), /* real_size */
675 W(0xffffffff), /* virt_base */
676 W(0xffffffff), /* virt_size */
677 W(0xffffffff), /* load_base */
678 W(64), /* 128MB min RMA */
679 W(0xffffffff), /* full client load */
680 0, /* min RMA percentage of total RAM */
681 48, /* max log_2(hash table size) */
683 /* option vector 3: processor options supported */
685 0, /* don't ignore, don't halt */
686 OV3_FP
| OV3_VMX
| OV3_DFP
,
688 /* option vector 4: IBM PAPR implementation */
692 /* option vector 5: PAPR/OF options */
694 0, /* don't ignore, don't halt */
695 OV5_LPAR
| OV5_SPLPAR
| OV5_LARGE_PAGES
| OV5_DRCONF_MEMORY
|
696 OV5_DONATE_DEDICATE_CPU
| OV5_MSI
,
701 /* Old method - ELF header with PT_NOTE sections */
702 static struct fake_elf
{
709 char name
[8]; /* "PowerPC" */
723 char name
[24]; /* "IBM,RPA-Client-Config" */
735 } fake_elf
__section(.fakeelf
) = {
737 .e_ident
= { 0x7f, 'E', 'L', 'F',
738 ELFCLASS32
, ELFDATA2MSB
, EV_CURRENT
},
739 .e_type
= ET_EXEC
, /* yeah right */
741 .e_version
= EV_CURRENT
,
742 .e_phoff
= offsetof(struct fake_elf
, phdr
),
743 .e_phentsize
= sizeof(Elf32_Phdr
),
749 .p_offset
= offsetof(struct fake_elf
, chrpnote
),
750 .p_filesz
= sizeof(struct chrpnote
)
753 .p_offset
= offsetof(struct fake_elf
, rpanote
),
754 .p_filesz
= sizeof(struct rpanote
)
758 .namesz
= sizeof("PowerPC"),
759 .descsz
= sizeof(struct chrpdesc
),
763 .real_mode
= ~0U, /* ~0 means "don't care" */
772 .namesz
= sizeof("IBM,RPA-Client-Config"),
773 .descsz
= sizeof(struct rpadesc
),
775 .name
= "IBM,RPA-Client-Config",
778 .min_rmo_size
= 128, /* in megabytes */
779 .min_rmo_percent
= 0,
780 .max_pft_size
= 46, /* 2^46 bytes max PFT size */
788 static void __init
prom_send_capabilities(void)
790 ihandle elfloader
, root
;
793 root
= call_prom("open", 1, 1, ADDR("/"));
795 /* try calling the ibm,client-architecture-support method */
796 if (call_prom_ret("call-method", 3, 2, &ret
,
797 ADDR("ibm,client-architecture-support"),
799 ADDR(ibm_architecture_vec
)) == 0) {
800 /* the call exists... */
802 prom_printf("WARNING: ibm,client-architecture"
803 "-support call FAILED!\n");
804 call_prom("close", 1, 0, root
);
807 call_prom("close", 1, 0, root
);
810 /* no ibm,client-architecture-support call, try the old way */
811 elfloader
= call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
812 if (elfloader
== 0) {
813 prom_printf("couldn't open /packages/elf-loader\n");
816 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
817 elfloader
, ADDR(&fake_elf
));
818 call_prom("close", 1, 0, elfloader
);
823 * Memory allocation strategy... our layout is normally:
825 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
826 * rare cases, initrd might end up being before the kernel though.
827 * We assume this won't override the final kernel at 0, we have no
828 * provision to handle that in this version, but it should hopefully
831 * alloc_top is set to the top of RMO, eventually shrink down if the
834 * alloc_bottom is set to the top of kernel/initrd
836 * from there, allocations are done this way : rtas is allocated
837 * topmost, and the device-tree is allocated from the bottom. We try
838 * to grow the device-tree allocation as we progress. If we can't,
839 * then we fail, we don't currently have a facility to restart
840 * elsewhere, but that shouldn't be necessary.
842 * Note that calls to reserve_mem have to be done explicitly, memory
843 * allocated with either alloc_up or alloc_down isn't automatically
849 * Allocates memory in the RMO upward from the kernel/initrd
851 * When align is 0, this is a special case, it means to allocate in place
852 * at the current location of alloc_bottom or fail (that is basically
853 * extending the previous allocation). Used for the device-tree flattening
855 static unsigned long __init
alloc_up(unsigned long size
, unsigned long align
)
857 unsigned long base
= RELOC(alloc_bottom
);
858 unsigned long addr
= 0;
861 base
= _ALIGN_UP(base
, align
);
862 prom_debug("alloc_up(%x, %x)\n", size
, align
);
863 if (RELOC(ram_top
) == 0)
864 prom_panic("alloc_up() called with mem not initialized\n");
867 base
= _ALIGN_UP(RELOC(alloc_bottom
), align
);
869 base
= RELOC(alloc_bottom
);
871 for(; (base
+ size
) <= RELOC(alloc_top
);
872 base
= _ALIGN_UP(base
+ 0x100000, align
)) {
873 prom_debug(" trying: 0x%x\n\r", base
);
874 addr
= (unsigned long)prom_claim(base
, size
, 0);
875 if (addr
!= PROM_ERROR
&& addr
!= 0)
883 RELOC(alloc_bottom
) = addr
;
885 prom_debug(" -> %x\n", addr
);
886 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
887 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
888 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
889 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
890 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
896 * Allocates memory downward, either from top of RMO, or if highmem
897 * is set, from the top of RAM. Note that this one doesn't handle
898 * failures. It does claim memory if highmem is not set.
900 static unsigned long __init
alloc_down(unsigned long size
, unsigned long align
,
903 unsigned long base
, addr
= 0;
905 prom_debug("alloc_down(%x, %x, %s)\n", size
, align
,
906 highmem
? RELOC("(high)") : RELOC("(low)"));
907 if (RELOC(ram_top
) == 0)
908 prom_panic("alloc_down() called with mem not initialized\n");
911 /* Carve out storage for the TCE table. */
912 addr
= _ALIGN_DOWN(RELOC(alloc_top_high
) - size
, align
);
913 if (addr
<= RELOC(alloc_bottom
))
915 /* Will we bump into the RMO ? If yes, check out that we
916 * didn't overlap existing allocations there, if we did,
917 * we are dead, we must be the first in town !
919 if (addr
< RELOC(rmo_top
)) {
920 /* Good, we are first */
921 if (RELOC(alloc_top
) == RELOC(rmo_top
))
922 RELOC(alloc_top
) = RELOC(rmo_top
) = addr
;
926 RELOC(alloc_top_high
) = addr
;
930 base
= _ALIGN_DOWN(RELOC(alloc_top
) - size
, align
);
931 for (; base
> RELOC(alloc_bottom
);
932 base
= _ALIGN_DOWN(base
- 0x100000, align
)) {
933 prom_debug(" trying: 0x%x\n\r", base
);
934 addr
= (unsigned long)prom_claim(base
, size
, 0);
935 if (addr
!= PROM_ERROR
&& addr
!= 0)
941 RELOC(alloc_top
) = addr
;
944 prom_debug(" -> %x\n", addr
);
945 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
946 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
947 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
948 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
949 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
957 static unsigned long __init
prom_next_cell(int s
, cell_t
**cellp
)
962 /* Ignore more than 2 cells */
963 while (s
> sizeof(unsigned long) / 4) {
979 * Very dumb function for adding to the memory reserve list, but
980 * we don't need anything smarter at this point
982 * XXX Eventually check for collisions. They should NEVER happen.
983 * If problems seem to show up, it would be a good start to track
986 static void __init
reserve_mem(u64 base
, u64 size
)
988 u64 top
= base
+ size
;
989 unsigned long cnt
= RELOC(mem_reserve_cnt
);
994 /* We need to always keep one empty entry so that we
995 * have our terminator with "size" set to 0 since we are
996 * dumb and just copy this entire array to the boot params
998 base
= _ALIGN_DOWN(base
, PAGE_SIZE
);
999 top
= _ALIGN_UP(top
, PAGE_SIZE
);
1002 if (cnt
>= (MEM_RESERVE_MAP_SIZE
- 1))
1003 prom_panic("Memory reserve map exhausted !\n");
1004 RELOC(mem_reserve_map
)[cnt
].base
= base
;
1005 RELOC(mem_reserve_map
)[cnt
].size
= size
;
1006 RELOC(mem_reserve_cnt
) = cnt
+ 1;
1010 * Initialize memory allocation mechanism, parse "memory" nodes and
1011 * obtain that way the top of memory and RMO to setup out local allocator
1013 static void __init
prom_init_mem(void)
1016 char *path
, type
[64];
1019 struct prom_t
*_prom
= &RELOC(prom
);
1023 * We iterate the memory nodes to find
1024 * 1) top of RMO (first node)
1028 prom_getprop(_prom
->root
, "#address-cells", &rac
, sizeof(rac
));
1030 prom_getprop(_prom
->root
, "#size-cells", &rsc
, sizeof(rsc
));
1031 prom_debug("root_addr_cells: %x\n", (unsigned long) rac
);
1032 prom_debug("root_size_cells: %x\n", (unsigned long) rsc
);
1034 prom_debug("scanning memory:\n");
1035 path
= RELOC(prom_scratch
);
1037 for (node
= 0; prom_next_node(&node
); ) {
1039 prom_getprop(node
, "device_type", type
, sizeof(type
));
1043 * CHRP Longtrail machines have no device_type
1044 * on the memory node, so check the name instead...
1046 prom_getprop(node
, "name", type
, sizeof(type
));
1048 if (strcmp(type
, RELOC("memory")))
1051 plen
= prom_getprop(node
, "reg", RELOC(regbuf
), sizeof(regbuf
));
1052 if (plen
> sizeof(regbuf
)) {
1053 prom_printf("memory node too large for buffer !\n");
1054 plen
= sizeof(regbuf
);
1057 endp
= p
+ (plen
/ sizeof(cell_t
));
1060 memset(path
, 0, PROM_SCRATCH_SIZE
);
1061 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1062 prom_debug(" node %s :\n", path
);
1063 #endif /* DEBUG_PROM */
1065 while ((endp
- p
) >= (rac
+ rsc
)) {
1066 unsigned long base
, size
;
1068 base
= prom_next_cell(rac
, &p
);
1069 size
= prom_next_cell(rsc
, &p
);
1073 prom_debug(" %x %x\n", base
, size
);
1074 if (base
== 0 && (RELOC(of_platform
) & PLATFORM_LPAR
))
1075 RELOC(rmo_top
) = size
;
1076 if ((base
+ size
) > RELOC(ram_top
))
1077 RELOC(ram_top
) = base
+ size
;
1081 RELOC(alloc_bottom
) = PAGE_ALIGN((unsigned long)&RELOC(_end
) + 0x4000);
1083 /* Check if we have an initrd after the kernel, if we do move our bottom
1086 if (RELOC(prom_initrd_start
)) {
1087 if (RELOC(prom_initrd_end
) > RELOC(alloc_bottom
))
1088 RELOC(alloc_bottom
) = PAGE_ALIGN(RELOC(prom_initrd_end
));
1092 * Setup our top alloc point, that is top of RMO or top of
1093 * segment 0 when running non-LPAR.
1094 * Some RS64 machines have buggy firmware where claims up at
1095 * 1GB fail. Cap at 768MB as a workaround.
1096 * Since 768MB is plenty of room, and we need to cap to something
1097 * reasonable on 32-bit, cap at 768MB on all machines.
1099 if (!RELOC(rmo_top
))
1100 RELOC(rmo_top
) = RELOC(ram_top
);
1101 RELOC(rmo_top
) = min(0x30000000ul
, RELOC(rmo_top
));
1102 RELOC(alloc_top
) = RELOC(rmo_top
);
1103 RELOC(alloc_top_high
) = RELOC(ram_top
);
1105 prom_printf("memory layout at init:\n");
1106 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
1107 prom_printf(" alloc_top : %x\n", RELOC(alloc_top
));
1108 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
1109 prom_printf(" rmo_top : %x\n", RELOC(rmo_top
));
1110 prom_printf(" ram_top : %x\n", RELOC(ram_top
));
1115 * Allocate room for and instantiate RTAS
1117 static void __init
prom_instantiate_rtas(void)
1121 u32 base
, entry
= 0;
1124 prom_debug("prom_instantiate_rtas: start...\n");
1126 rtas_node
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1127 prom_debug("rtas_node: %x\n", rtas_node
);
1128 if (!PHANDLE_VALID(rtas_node
))
1131 prom_getprop(rtas_node
, "rtas-size", &size
, sizeof(size
));
1135 base
= alloc_down(size
, PAGE_SIZE
, 0);
1137 prom_printf("RTAS allocation failed !\n");
1141 rtas_inst
= call_prom("open", 1, 1, ADDR("/rtas"));
1142 if (!IHANDLE_VALID(rtas_inst
)) {
1143 prom_printf("opening rtas package failed (%x)\n", rtas_inst
);
1147 prom_printf("instantiating rtas at 0x%x ...", base
);
1149 if (call_prom_ret("call-method", 3, 2, &entry
,
1150 ADDR("instantiate-rtas"),
1151 rtas_inst
, base
) != 0
1153 prom_printf(" failed\n");
1156 prom_printf(" done\n");
1158 reserve_mem(base
, size
);
1160 prom_setprop(rtas_node
, "/rtas", "linux,rtas-base",
1161 &base
, sizeof(base
));
1162 prom_setprop(rtas_node
, "/rtas", "linux,rtas-entry",
1163 &entry
, sizeof(entry
));
1165 prom_debug("rtas base = 0x%x\n", base
);
1166 prom_debug("rtas entry = 0x%x\n", entry
);
1167 prom_debug("rtas size = 0x%x\n", (long)size
);
1169 prom_debug("prom_instantiate_rtas: end...\n");
1174 * Allocate room for and initialize TCE tables
1176 static void __init
prom_initialize_tce_table(void)
1180 char compatible
[64], type
[64], model
[64];
1181 char *path
= RELOC(prom_scratch
);
1183 u32 minalign
, minsize
;
1184 u64 tce_entry
, *tce_entryp
;
1185 u64 local_alloc_top
, local_alloc_bottom
;
1188 if (RELOC(prom_iommu_off
))
1191 prom_debug("starting prom_initialize_tce_table\n");
1193 /* Cache current top of allocs so we reserve a single block */
1194 local_alloc_top
= RELOC(alloc_top_high
);
1195 local_alloc_bottom
= local_alloc_top
;
1197 /* Search all nodes looking for PHBs. */
1198 for (node
= 0; prom_next_node(&node
); ) {
1202 prom_getprop(node
, "compatible",
1203 compatible
, sizeof(compatible
));
1204 prom_getprop(node
, "device_type", type
, sizeof(type
));
1205 prom_getprop(node
, "model", model
, sizeof(model
));
1207 if ((type
[0] == 0) || (strstr(type
, RELOC("pci")) == NULL
))
1210 /* Keep the old logic intact to avoid regression. */
1211 if (compatible
[0] != 0) {
1212 if ((strstr(compatible
, RELOC("python")) == NULL
) &&
1213 (strstr(compatible
, RELOC("Speedwagon")) == NULL
) &&
1214 (strstr(compatible
, RELOC("Winnipeg")) == NULL
))
1216 } else if (model
[0] != 0) {
1217 if ((strstr(model
, RELOC("ython")) == NULL
) &&
1218 (strstr(model
, RELOC("peedwagon")) == NULL
) &&
1219 (strstr(model
, RELOC("innipeg")) == NULL
))
1223 if (prom_getprop(node
, "tce-table-minalign", &minalign
,
1224 sizeof(minalign
)) == PROM_ERROR
)
1226 if (prom_getprop(node
, "tce-table-minsize", &minsize
,
1227 sizeof(minsize
)) == PROM_ERROR
)
1228 minsize
= 4UL << 20;
1231 * Even though we read what OF wants, we just set the table
1232 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1233 * By doing this, we avoid the pitfalls of trying to DMA to
1234 * MMIO space and the DMA alias hole.
1236 * On POWER4, firmware sets the TCE region by assuming
1237 * each TCE table is 8MB. Using this memory for anything
1238 * else will impact performance, so we always allocate 8MB.
1241 if (__is_processor(PV_POWER4
) || __is_processor(PV_POWER4p
))
1242 minsize
= 8UL << 20;
1244 minsize
= 4UL << 20;
1246 /* Align to the greater of the align or size */
1247 align
= max(minalign
, minsize
);
1248 base
= alloc_down(minsize
, align
, 1);
1250 prom_panic("ERROR, cannot find space for TCE table.\n");
1251 if (base
< local_alloc_bottom
)
1252 local_alloc_bottom
= base
;
1254 /* It seems OF doesn't null-terminate the path :-( */
1255 memset(path
, 0, PROM_SCRATCH_SIZE
);
1256 /* Call OF to setup the TCE hardware */
1257 if (call_prom("package-to-path", 3, 1, node
,
1258 path
, PROM_SCRATCH_SIZE
-1) == PROM_ERROR
) {
1259 prom_printf("package-to-path failed\n");
1262 /* Save away the TCE table attributes for later use. */
1263 prom_setprop(node
, path
, "linux,tce-base", &base
, sizeof(base
));
1264 prom_setprop(node
, path
, "linux,tce-size", &minsize
, sizeof(minsize
));
1266 prom_debug("TCE table: %s\n", path
);
1267 prom_debug("\tnode = 0x%x\n", node
);
1268 prom_debug("\tbase = 0x%x\n", base
);
1269 prom_debug("\tsize = 0x%x\n", minsize
);
1271 /* Initialize the table to have a one-to-one mapping
1272 * over the allocated size.
1274 tce_entryp
= (unsigned long *)base
;
1275 for (i
= 0; i
< (minsize
>> 3) ;tce_entryp
++, i
++) {
1276 tce_entry
= (i
<< PAGE_SHIFT
);
1278 *tce_entryp
= tce_entry
;
1281 prom_printf("opening PHB %s", path
);
1282 phb_node
= call_prom("open", 1, 1, path
);
1284 prom_printf("... failed\n");
1286 prom_printf("... done\n");
1288 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1289 phb_node
, -1, minsize
,
1290 (u32
) base
, (u32
) (base
>> 32));
1291 call_prom("close", 1, 0, phb_node
);
1294 reserve_mem(local_alloc_bottom
, local_alloc_top
- local_alloc_bottom
);
1296 /* These are only really needed if there is a memory limit in
1297 * effect, but we don't know so export them always. */
1298 RELOC(prom_tce_alloc_start
) = local_alloc_bottom
;
1299 RELOC(prom_tce_alloc_end
) = local_alloc_top
;
1301 /* Flag the first invalid entry */
1302 prom_debug("ending prom_initialize_tce_table\n");
1307 * With CHRP SMP we need to use the OF to start the other processors.
1308 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1309 * so we have to put the processors into a holding pattern controlled
1310 * by the kernel (not OF) before we destroy the OF.
1312 * This uses a chunk of low memory, puts some holding pattern
1313 * code there and sends the other processors off to there until
1314 * smp_boot_cpus tells them to do something. The holding pattern
1315 * checks that address until its cpu # is there, when it is that
1316 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1317 * of setting those values.
1319 * We also use physical address 0x4 here to tell when a cpu
1320 * is in its holding pattern code.
1324 extern char __secondary_hold
;
1325 extern unsigned long __secondary_hold_spinloop
;
1326 extern unsigned long __secondary_hold_acknowledge
;
1329 * We want to reference the copy of __secondary_hold_* in the
1330 * 0 - 0x100 address range
1332 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1334 static void __init
prom_hold_cpus(void)
1340 struct prom_t
*_prom
= &RELOC(prom
);
1341 unsigned long *spinloop
1342 = (void *) LOW_ADDR(__secondary_hold_spinloop
);
1343 unsigned long *acknowledge
1344 = (void *) LOW_ADDR(__secondary_hold_acknowledge
);
1345 unsigned long secondary_hold
= LOW_ADDR(__secondary_hold
);
1347 prom_debug("prom_hold_cpus: start...\n");
1348 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop
);
1349 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop
);
1350 prom_debug(" 1) acknowledge = 0x%x\n",
1351 (unsigned long)acknowledge
);
1352 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge
);
1353 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold
);
1355 /* Set the common spinloop variable, so all of the secondary cpus
1356 * will block when they are awakened from their OF spinloop.
1357 * This must occur for both SMP and non SMP kernels, since OF will
1358 * be trashed when we move the kernel.
1363 for (node
= 0; prom_next_node(&node
); ) {
1365 prom_getprop(node
, "device_type", type
, sizeof(type
));
1366 if (strcmp(type
, RELOC("cpu")) != 0)
1369 /* Skip non-configured cpus. */
1370 if (prom_getprop(node
, "status", type
, sizeof(type
)) > 0)
1371 if (strcmp(type
, RELOC("okay")) != 0)
1375 prom_getprop(node
, "reg", ®
, sizeof(reg
));
1377 prom_debug("cpu hw idx = 0x%x\n", reg
);
1379 /* Init the acknowledge var which will be reset by
1380 * the secondary cpu when it awakens from its OF
1383 *acknowledge
= (unsigned long)-1;
1385 if (reg
!= _prom
->cpu
) {
1386 /* Primary Thread of non-boot cpu */
1387 prom_printf("starting cpu hw idx %x... ", reg
);
1388 call_prom("start-cpu", 3, 0, node
,
1389 secondary_hold
, reg
);
1391 for (i
= 0; (i
< 100000000) &&
1392 (*acknowledge
== ((unsigned long)-1)); i
++ )
1395 if (*acknowledge
== reg
)
1396 prom_printf("done\n");
1398 prom_printf("failed: %x\n", *acknowledge
);
1402 prom_printf("boot cpu hw idx %x\n", reg
);
1403 #endif /* CONFIG_SMP */
1406 prom_debug("prom_hold_cpus: end...\n");
1410 static void __init
prom_init_client_services(unsigned long pp
)
1412 struct prom_t
*_prom
= &RELOC(prom
);
1414 /* Get a handle to the prom entry point before anything else */
1415 RELOC(prom_entry
) = pp
;
1417 /* get a handle for the stdout device */
1418 _prom
->chosen
= call_prom("finddevice", 1, 1, ADDR("/chosen"));
1419 if (!PHANDLE_VALID(_prom
->chosen
))
1420 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1422 /* get device tree root */
1423 _prom
->root
= call_prom("finddevice", 1, 1, ADDR("/"));
1424 if (!PHANDLE_VALID(_prom
->root
))
1425 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1432 * For really old powermacs, we need to map things we claim.
1433 * For that, we need the ihandle of the mmu.
1434 * Also, on the longtrail, we need to work around other bugs.
1436 static void __init
prom_find_mmu(void)
1438 struct prom_t
*_prom
= &RELOC(prom
);
1442 oprom
= call_prom("finddevice", 1, 1, ADDR("/openprom"));
1443 if (!PHANDLE_VALID(oprom
))
1445 if (prom_getprop(oprom
, "model", version
, sizeof(version
)) <= 0)
1447 version
[sizeof(version
) - 1] = 0;
1448 /* XXX might need to add other versions here */
1449 if (strcmp(version
, "Open Firmware, 1.0.5") == 0)
1450 of_workarounds
= OF_WA_CLAIM
;
1451 else if (strncmp(version
, "FirmWorks,3.", 12) == 0) {
1452 of_workarounds
= OF_WA_CLAIM
| OF_WA_LONGTRAIL
;
1453 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1456 _prom
->memory
= call_prom("open", 1, 1, ADDR("/memory"));
1457 prom_getprop(_prom
->chosen
, "mmu", &_prom
->mmumap
,
1458 sizeof(_prom
->mmumap
));
1459 if (!IHANDLE_VALID(_prom
->memory
) || !IHANDLE_VALID(_prom
->mmumap
))
1460 of_workarounds
&= ~OF_WA_CLAIM
; /* hmmm */
1463 #define prom_find_mmu()
1466 static void __init
prom_init_stdout(void)
1468 struct prom_t
*_prom
= &RELOC(prom
);
1469 char *path
= RELOC(of_stdout_device
);
1473 if (prom_getprop(_prom
->chosen
, "stdout", &val
, sizeof(val
)) <= 0)
1474 prom_panic("cannot find stdout");
1476 _prom
->stdout
= val
;
1478 /* Get the full OF pathname of the stdout device */
1479 memset(path
, 0, 256);
1480 call_prom("instance-to-path", 3, 1, _prom
->stdout
, path
, 255);
1481 val
= call_prom("instance-to-package", 1, 1, _prom
->stdout
);
1482 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-package",
1484 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device
));
1485 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-path",
1486 path
, strlen(path
) + 1);
1488 /* If it's a display, note it */
1489 memset(type
, 0, sizeof(type
));
1490 prom_getprop(val
, "device_type", type
, sizeof(type
));
1491 if (strcmp(type
, RELOC("display")) == 0)
1492 prom_setprop(val
, path
, "linux,boot-display", NULL
, 0);
1495 static void __init
prom_close_stdin(void)
1497 struct prom_t
*_prom
= &RELOC(prom
);
1500 if (prom_getprop(_prom
->chosen
, "stdin", &val
, sizeof(val
)) > 0)
1501 call_prom("close", 1, 0, val
);
1504 static int __init
prom_find_machine_type(void)
1506 struct prom_t
*_prom
= &RELOC(prom
);
1514 /* Look for a PowerMac */
1515 len
= prom_getprop(_prom
->root
, "compatible",
1516 compat
, sizeof(compat
)-1);
1520 char *p
= &compat
[i
];
1524 if (strstr(p
, RELOC("Power Macintosh")) ||
1525 strstr(p
, RELOC("MacRISC")))
1526 return PLATFORM_POWERMAC
;
1528 /* We must make sure we don't detect the IBM Cell
1529 * blades as pSeries due to some firmware issues,
1532 if (strstr(p
, RELOC("IBM,CBEA")) ||
1533 strstr(p
, RELOC("IBM,CPBW-1.0")))
1534 return PLATFORM_GENERIC
;
1535 #endif /* CONFIG_PPC64 */
1540 /* If not a mac, try to figure out if it's an IBM pSeries or any other
1541 * PAPR compliant platform. We assume it is if :
1542 * - /device_type is "chrp" (please, do NOT use that for future
1546 len
= prom_getprop(_prom
->root
, "device_type",
1547 compat
, sizeof(compat
)-1);
1549 return PLATFORM_GENERIC
;
1550 if (strcmp(compat
, RELOC("chrp")))
1551 return PLATFORM_GENERIC
;
1553 /* Default to pSeries. We need to know if we are running LPAR */
1554 rtas
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1555 if (!PHANDLE_VALID(rtas
))
1556 return PLATFORM_GENERIC
;
1557 x
= prom_getproplen(rtas
, "ibm,hypertas-functions");
1558 if (x
!= PROM_ERROR
) {
1559 prom_printf("Hypertas detected, assuming LPAR !\n");
1560 return PLATFORM_PSERIES_LPAR
;
1562 return PLATFORM_PSERIES
;
1564 return PLATFORM_GENERIC
;
1568 static int __init
prom_set_color(ihandle ih
, int i
, int r
, int g
, int b
)
1570 return call_prom("call-method", 6, 1, ADDR("color!"), ih
, i
, b
, g
, r
);
1574 * If we have a display that we don't know how to drive,
1575 * we will want to try to execute OF's open method for it
1576 * later. However, OF will probably fall over if we do that
1577 * we've taken over the MMU.
1578 * So we check whether we will need to open the display,
1579 * and if so, open it now.
1581 static void __init
prom_check_displays(void)
1583 char type
[16], *path
;
1588 static unsigned char default_colors
[] = {
1606 const unsigned char *clut
;
1608 prom_printf("Looking for displays\n");
1609 for (node
= 0; prom_next_node(&node
); ) {
1610 memset(type
, 0, sizeof(type
));
1611 prom_getprop(node
, "device_type", type
, sizeof(type
));
1612 if (strcmp(type
, RELOC("display")) != 0)
1615 /* It seems OF doesn't null-terminate the path :-( */
1616 path
= RELOC(prom_scratch
);
1617 memset(path
, 0, PROM_SCRATCH_SIZE
);
1620 * leave some room at the end of the path for appending extra
1623 if (call_prom("package-to-path", 3, 1, node
, path
,
1624 PROM_SCRATCH_SIZE
-10) == PROM_ERROR
)
1626 prom_printf("found display : %s, opening ... ", path
);
1628 ih
= call_prom("open", 1, 1, path
);
1630 prom_printf("failed\n");
1635 prom_printf("done\n");
1636 prom_setprop(node
, path
, "linux,opened", NULL
, 0);
1638 /* Setup a usable color table when the appropriate
1639 * method is available. Should update this to set-colors */
1640 clut
= RELOC(default_colors
);
1641 for (i
= 0; i
< 32; i
++, clut
+= 3)
1642 if (prom_set_color(ih
, i
, clut
[0], clut
[1],
1646 #ifdef CONFIG_LOGO_LINUX_CLUT224
1647 clut
= PTRRELOC(RELOC(logo_linux_clut224
.clut
));
1648 for (i
= 0; i
< RELOC(logo_linux_clut224
.clutsize
); i
++, clut
+= 3)
1649 if (prom_set_color(ih
, i
+ 32, clut
[0], clut
[1],
1652 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1657 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1658 static void __init
*make_room(unsigned long *mem_start
, unsigned long *mem_end
,
1659 unsigned long needed
, unsigned long align
)
1663 *mem_start
= _ALIGN(*mem_start
, align
);
1664 while ((*mem_start
+ needed
) > *mem_end
) {
1665 unsigned long room
, chunk
;
1667 prom_debug("Chunk exhausted, claiming more at %x...\n",
1668 RELOC(alloc_bottom
));
1669 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
);
1670 if (room
> DEVTREE_CHUNK_SIZE
)
1671 room
= DEVTREE_CHUNK_SIZE
;
1672 if (room
< PAGE_SIZE
)
1673 prom_panic("No memory for flatten_device_tree (no room)");
1674 chunk
= alloc_up(room
, 0);
1676 prom_panic("No memory for flatten_device_tree (claim failed)");
1677 *mem_end
= RELOC(alloc_top
);
1680 ret
= (void *)*mem_start
;
1681 *mem_start
+= needed
;
1686 #define dt_push_token(token, mem_start, mem_end) \
1687 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1689 static unsigned long __init
dt_find_string(char *str
)
1693 s
= os
= (char *)RELOC(dt_string_start
);
1695 while (s
< (char *)RELOC(dt_string_end
)) {
1696 if (strcmp(s
, str
) == 0)
1704 * The Open Firmware 1275 specification states properties must be 31 bytes or
1705 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1707 #define MAX_PROPERTY_NAME 64
1709 static void __init
scan_dt_build_strings(phandle node
,
1710 unsigned long *mem_start
,
1711 unsigned long *mem_end
)
1713 char *prev_name
, *namep
, *sstart
;
1717 sstart
= (char *)RELOC(dt_string_start
);
1719 /* get and store all property names */
1720 prev_name
= RELOC("");
1722 /* 64 is max len of name including nul. */
1723 namep
= make_room(mem_start
, mem_end
, MAX_PROPERTY_NAME
, 1);
1724 if (call_prom("nextprop", 3, 1, node
, prev_name
, namep
) != 1) {
1725 /* No more nodes: unwind alloc */
1726 *mem_start
= (unsigned long)namep
;
1731 if (strcmp(namep
, RELOC("name")) == 0) {
1732 *mem_start
= (unsigned long)namep
;
1733 prev_name
= RELOC("name");
1736 /* get/create string entry */
1737 soff
= dt_find_string(namep
);
1739 *mem_start
= (unsigned long)namep
;
1740 namep
= sstart
+ soff
;
1742 /* Trim off some if we can */
1743 *mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1744 RELOC(dt_string_end
) = *mem_start
;
1749 /* do all our children */
1750 child
= call_prom("child", 1, 1, node
);
1751 while (child
!= 0) {
1752 scan_dt_build_strings(child
, mem_start
, mem_end
);
1753 child
= call_prom("peer", 1, 1, child
);
1757 static void __init
scan_dt_build_struct(phandle node
, unsigned long *mem_start
,
1758 unsigned long *mem_end
)
1761 char *namep
, *prev_name
, *sstart
, *p
, *ep
, *lp
, *path
;
1763 unsigned char *valp
;
1764 static char pname
[MAX_PROPERTY_NAME
];
1767 dt_push_token(OF_DT_BEGIN_NODE
, mem_start
, mem_end
);
1769 /* get the node's full name */
1770 namep
= (char *)*mem_start
;
1771 room
= *mem_end
- *mem_start
;
1774 l
= call_prom("package-to-path", 3, 1, node
, namep
, room
);
1776 /* Didn't fit? Get more room. */
1778 if (l
>= *mem_end
- *mem_start
)
1779 namep
= make_room(mem_start
, mem_end
, l
+1, 1);
1780 call_prom("package-to-path", 3, 1, node
, namep
, l
);
1784 /* Fixup an Apple bug where they have bogus \0 chars in the
1785 * middle of the path in some properties, and extract
1786 * the unit name (everything after the last '/').
1788 for (lp
= p
= namep
, ep
= namep
+ l
; p
< ep
; p
++) {
1795 *mem_start
= _ALIGN((unsigned long)lp
+ 1, 4);
1798 /* get it again for debugging */
1799 path
= RELOC(prom_scratch
);
1800 memset(path
, 0, PROM_SCRATCH_SIZE
);
1801 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1803 /* get and store all properties */
1804 prev_name
= RELOC("");
1805 sstart
= (char *)RELOC(dt_string_start
);
1807 if (call_prom("nextprop", 3, 1, node
, prev_name
,
1812 if (strcmp(RELOC(pname
), RELOC("name")) == 0) {
1813 prev_name
= RELOC("name");
1817 /* find string offset */
1818 soff
= dt_find_string(RELOC(pname
));
1820 prom_printf("WARNING: Can't find string index for"
1821 " <%s>, node %s\n", RELOC(pname
), path
);
1824 prev_name
= sstart
+ soff
;
1827 l
= call_prom("getproplen", 2, 1, node
, RELOC(pname
));
1830 if (l
== PROM_ERROR
)
1832 if (l
> MAX_PROPERTY_LENGTH
) {
1833 prom_printf("WARNING: ignoring large property ");
1834 /* It seems OF doesn't null-terminate the path :-( */
1835 prom_printf("[%s] ", path
);
1836 prom_printf("%s length 0x%x\n", RELOC(pname
), l
);
1840 /* push property head */
1841 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1842 dt_push_token(l
, mem_start
, mem_end
);
1843 dt_push_token(soff
, mem_start
, mem_end
);
1845 /* push property content */
1846 valp
= make_room(mem_start
, mem_end
, l
, 4);
1847 call_prom("getprop", 4, 1, node
, RELOC(pname
), valp
, l
);
1848 *mem_start
= _ALIGN(*mem_start
, 4);
1851 /* Add a "linux,phandle" property. */
1852 soff
= dt_find_string(RELOC("linux,phandle"));
1854 prom_printf("WARNING: Can't find string index for"
1855 " <linux-phandle> node %s\n", path
);
1857 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1858 dt_push_token(4, mem_start
, mem_end
);
1859 dt_push_token(soff
, mem_start
, mem_end
);
1860 valp
= make_room(mem_start
, mem_end
, 4, 4);
1861 *(u32
*)valp
= node
;
1864 /* do all our children */
1865 child
= call_prom("child", 1, 1, node
);
1866 while (child
!= 0) {
1867 scan_dt_build_struct(child
, mem_start
, mem_end
);
1868 child
= call_prom("peer", 1, 1, child
);
1871 dt_push_token(OF_DT_END_NODE
, mem_start
, mem_end
);
1874 static void __init
flatten_device_tree(void)
1877 unsigned long mem_start
, mem_end
, room
;
1878 struct boot_param_header
*hdr
;
1879 struct prom_t
*_prom
= &RELOC(prom
);
1884 * Check how much room we have between alloc top & bottom (+/- a
1885 * few pages), crop to 4Mb, as this is our "chuck" size
1887 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
) - 0x4000;
1888 if (room
> DEVTREE_CHUNK_SIZE
)
1889 room
= DEVTREE_CHUNK_SIZE
;
1890 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom
));
1892 /* Now try to claim that */
1893 mem_start
= (unsigned long)alloc_up(room
, PAGE_SIZE
);
1895 prom_panic("Can't allocate initial device-tree chunk\n");
1896 mem_end
= RELOC(alloc_top
);
1898 /* Get root of tree */
1899 root
= call_prom("peer", 1, 1, (phandle
)0);
1900 if (root
== (phandle
)0)
1901 prom_panic ("couldn't get device tree root\n");
1903 /* Build header and make room for mem rsv map */
1904 mem_start
= _ALIGN(mem_start
, 4);
1905 hdr
= make_room(&mem_start
, &mem_end
,
1906 sizeof(struct boot_param_header
), 4);
1907 RELOC(dt_header_start
) = (unsigned long)hdr
;
1908 rsvmap
= make_room(&mem_start
, &mem_end
, sizeof(mem_reserve_map
), 8);
1910 /* Start of strings */
1911 mem_start
= PAGE_ALIGN(mem_start
);
1912 RELOC(dt_string_start
) = mem_start
;
1913 mem_start
+= 4; /* hole */
1915 /* Add "linux,phandle" in there, we'll need it */
1916 namep
= make_room(&mem_start
, &mem_end
, 16, 1);
1917 strcpy(namep
, RELOC("linux,phandle"));
1918 mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1920 /* Build string array */
1921 prom_printf("Building dt strings...\n");
1922 scan_dt_build_strings(root
, &mem_start
, &mem_end
);
1923 RELOC(dt_string_end
) = mem_start
;
1925 /* Build structure */
1926 mem_start
= PAGE_ALIGN(mem_start
);
1927 RELOC(dt_struct_start
) = mem_start
;
1928 prom_printf("Building dt structure...\n");
1929 scan_dt_build_struct(root
, &mem_start
, &mem_end
);
1930 dt_push_token(OF_DT_END
, &mem_start
, &mem_end
);
1931 RELOC(dt_struct_end
) = PAGE_ALIGN(mem_start
);
1934 hdr
->boot_cpuid_phys
= _prom
->cpu
;
1935 hdr
->magic
= OF_DT_HEADER
;
1936 hdr
->totalsize
= RELOC(dt_struct_end
) - RELOC(dt_header_start
);
1937 hdr
->off_dt_struct
= RELOC(dt_struct_start
) - RELOC(dt_header_start
);
1938 hdr
->off_dt_strings
= RELOC(dt_string_start
) - RELOC(dt_header_start
);
1939 hdr
->dt_strings_size
= RELOC(dt_string_end
) - RELOC(dt_string_start
);
1940 hdr
->off_mem_rsvmap
= ((unsigned long)rsvmap
) - RELOC(dt_header_start
);
1941 hdr
->version
= OF_DT_VERSION
;
1942 /* Version 16 is not backward compatible */
1943 hdr
->last_comp_version
= 0x10;
1945 /* Copy the reserve map in */
1946 memcpy(rsvmap
, RELOC(mem_reserve_map
), sizeof(mem_reserve_map
));
1951 prom_printf("reserved memory map:\n");
1952 for (i
= 0; i
< RELOC(mem_reserve_cnt
); i
++)
1953 prom_printf(" %x - %x\n",
1954 RELOC(mem_reserve_map
)[i
].base
,
1955 RELOC(mem_reserve_map
)[i
].size
);
1958 /* Bump mem_reserve_cnt to cause further reservations to fail
1959 * since it's too late.
1961 RELOC(mem_reserve_cnt
) = MEM_RESERVE_MAP_SIZE
;
1963 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1964 RELOC(dt_string_start
), RELOC(dt_string_end
));
1965 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1966 RELOC(dt_struct_start
), RELOC(dt_struct_end
));
1970 #ifdef CONFIG_PPC_MAPLE
1971 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
1972 * The values are bad, and it doesn't even have the right number of cells. */
1973 static void __init
fixup_device_tree_maple(void)
1976 u32 rloc
= 0x01002000; /* IO space; PCI device = 4 */
1980 name
= "/ht@0/isa@4";
1981 isa
= call_prom("finddevice", 1, 1, ADDR(name
));
1982 if (!PHANDLE_VALID(isa
)) {
1983 name
= "/ht@0/isa@6";
1984 isa
= call_prom("finddevice", 1, 1, ADDR(name
));
1985 rloc
= 0x01003000; /* IO space; PCI device = 6 */
1987 if (!PHANDLE_VALID(isa
))
1990 if (prom_getproplen(isa
, "ranges") != 12)
1992 if (prom_getprop(isa
, "ranges", isa_ranges
, sizeof(isa_ranges
))
1996 if (isa_ranges
[0] != 0x1 ||
1997 isa_ranges
[1] != 0xf4000000 ||
1998 isa_ranges
[2] != 0x00010000)
2001 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n");
2003 isa_ranges
[0] = 0x1;
2004 isa_ranges
[1] = 0x0;
2005 isa_ranges
[2] = rloc
;
2006 isa_ranges
[3] = 0x0;
2007 isa_ranges
[4] = 0x0;
2008 isa_ranges
[5] = 0x00010000;
2009 prom_setprop(isa
, name
, "ranges",
2010 isa_ranges
, sizeof(isa_ranges
));
2013 #define fixup_device_tree_maple()
2016 #ifdef CONFIG_PPC_CHRP
2018 * Pegasos and BriQ lacks the "ranges" property in the isa node
2019 * Pegasos needs decimal IRQ 14/15, not hexadecimal
2020 * Pegasos has the IDE configured in legacy mode, but advertised as native
2022 static void __init
fixup_device_tree_chrp(void)
2026 u32 rloc
= 0x01006000; /* IO space; PCI device = 12 */
2030 name
= "/pci@80000000/isa@c";
2031 ph
= call_prom("finddevice", 1, 1, ADDR(name
));
2032 if (!PHANDLE_VALID(ph
)) {
2033 name
= "/pci@ff500000/isa@6";
2034 ph
= call_prom("finddevice", 1, 1, ADDR(name
));
2035 rloc
= 0x01003000; /* IO space; PCI device = 6 */
2037 if (PHANDLE_VALID(ph
)) {
2038 rc
= prom_getproplen(ph
, "ranges");
2039 if (rc
== 0 || rc
== PROM_ERROR
) {
2040 prom_printf("Fixing up missing ISA range on Pegasos...\n");
2047 prop
[5] = 0x00010000;
2048 prom_setprop(ph
, name
, "ranges", prop
, sizeof(prop
));
2052 name
= "/pci@80000000/ide@C,1";
2053 ph
= call_prom("finddevice", 1, 1, ADDR(name
));
2054 if (PHANDLE_VALID(ph
)) {
2055 prom_printf("Fixing up IDE interrupt on Pegasos...\n");
2058 prom_setprop(ph
, name
, "interrupts", prop
, 2*sizeof(u32
));
2059 prom_printf("Fixing up IDE class-code on Pegasos...\n");
2060 rc
= prom_getprop(ph
, "class-code", prop
, sizeof(u32
));
2061 if (rc
== sizeof(u32
)) {
2063 prom_setprop(ph
, name
, "class-code", prop
, sizeof(u32
));
2068 #define fixup_device_tree_chrp()
2071 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2072 static void __init
fixup_device_tree_pmac(void)
2074 phandle u3
, i2c
, mpic
;
2079 /* Some G5s have a missing interrupt definition, fix it up here */
2080 u3
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2081 if (!PHANDLE_VALID(u3
))
2083 i2c
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2084 if (!PHANDLE_VALID(i2c
))
2086 mpic
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2087 if (!PHANDLE_VALID(mpic
))
2090 /* check if proper rev of u3 */
2091 if (prom_getprop(u3
, "device-rev", &u3_rev
, sizeof(u3_rev
))
2094 if (u3_rev
< 0x35 || u3_rev
> 0x39)
2096 /* does it need fixup ? */
2097 if (prom_getproplen(i2c
, "interrupts") > 0)
2100 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2102 /* interrupt on this revision of u3 is number 0 and level */
2105 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2106 &interrupts
, sizeof(interrupts
));
2108 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2109 &parent
, sizeof(parent
));
2112 #define fixup_device_tree_pmac()
2115 #ifdef CONFIG_PPC_EFIKA
2117 * The MPC5200 FEC driver requires an phy-handle property to tell it how
2118 * to talk to the phy. If the phy-handle property is missing, then this
2119 * function is called to add the appropriate nodes and link it to the
2122 static void __init
fixup_device_tree_efika_add_phy(void)
2128 /* Check if /builtin/ethernet exists - bail if it doesn't */
2129 node
= call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet"));
2130 if (!PHANDLE_VALID(node
))
2133 /* Check if the phy-handle property exists - bail if it does */
2134 rv
= prom_getprop(node
, "phy-handle", prop
, sizeof(prop
));
2139 * At this point the ethernet device doesn't have a phy described.
2140 * Now we need to add the missing phy node and linkage
2143 /* Check for an MDIO bus node - if missing then create one */
2144 node
= call_prom("finddevice", 1, 1, ADDR("/builtin/mdio"));
2145 if (!PHANDLE_VALID(node
)) {
2146 prom_printf("Adding Ethernet MDIO node\n");
2147 call_prom("interpret", 1, 1,
2148 " s\" /builtin\" find-device"
2150 " 1 encode-int s\" #address-cells\" property"
2151 " 0 encode-int s\" #size-cells\" property"
2152 " s\" mdio\" device-name"
2153 " s\" fsl,mpc5200b-mdio\" encode-string"
2154 " s\" compatible\" property"
2155 " 0xf0003000 0x400 reg"
2157 " 0x5 encode-int encode+"
2158 " 0x3 encode-int encode+"
2159 " s\" interrupts\" property"
2163 /* Check for a PHY device node - if missing then create one and
2164 * give it's phandle to the ethernet node */
2165 node
= call_prom("finddevice", 1, 1,
2166 ADDR("/builtin/mdio/ethernet-phy"));
2167 if (!PHANDLE_VALID(node
)) {
2168 prom_printf("Adding Ethernet PHY node\n");
2169 call_prom("interpret", 1, 1,
2170 " s\" /builtin/mdio\" find-device"
2172 " s\" ethernet-phy\" device-name"
2173 " 0x10 encode-int s\" reg\" property"
2177 " s\" /builtin/ethernet\" find-device"
2179 " s\" phy-handle\" property"
2184 static void __init
fixup_device_tree_efika(void)
2186 int sound_irq
[3] = { 2, 2, 0 };
2187 int bcomm_irq
[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0,
2188 3,4,0, 3,5,0, 3,6,0, 3,7,0,
2189 3,8,0, 3,9,0, 3,10,0, 3,11,0,
2190 3,12,0, 3,13,0, 3,14,0, 3,15,0 };
2195 /* Check if we're really running on a EFIKA */
2196 node
= call_prom("finddevice", 1, 1, ADDR("/"));
2197 if (!PHANDLE_VALID(node
))
2200 rv
= prom_getprop(node
, "model", prop
, sizeof(prop
));
2201 if (rv
== PROM_ERROR
)
2203 if (strcmp(prop
, "EFIKA5K2"))
2206 prom_printf("Applying EFIKA device tree fixups\n");
2208 /* Claiming to be 'chrp' is death */
2209 node
= call_prom("finddevice", 1, 1, ADDR("/"));
2210 rv
= prom_getprop(node
, "device_type", prop
, sizeof(prop
));
2211 if (rv
!= PROM_ERROR
&& (strcmp(prop
, "chrp") == 0))
2212 prom_setprop(node
, "/", "device_type", "efika", sizeof("efika"));
2214 /* CODEGEN,description is exposed in /proc/cpuinfo so
2216 rv
= prom_getprop(node
, "CODEGEN,description", prop
, sizeof(prop
));
2217 if (rv
!= PROM_ERROR
&& (strstr(prop
, "CHRP")))
2218 prom_setprop(node
, "/", "CODEGEN,description",
2219 "Efika 5200B PowerPC System",
2220 sizeof("Efika 5200B PowerPC System"));
2222 /* Fixup bestcomm interrupts property */
2223 node
= call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm"));
2224 if (PHANDLE_VALID(node
)) {
2225 len
= prom_getproplen(node
, "interrupts");
2227 prom_printf("Fixing bestcomm interrupts property\n");
2228 prom_setprop(node
, "/builtin/bestcom", "interrupts",
2229 bcomm_irq
, sizeof(bcomm_irq
));
2233 /* Fixup sound interrupts property */
2234 node
= call_prom("finddevice", 1, 1, ADDR("/builtin/sound"));
2235 if (PHANDLE_VALID(node
)) {
2236 rv
= prom_getprop(node
, "interrupts", prop
, sizeof(prop
));
2237 if (rv
== PROM_ERROR
) {
2238 prom_printf("Adding sound interrupts property\n");
2239 prom_setprop(node
, "/builtin/sound", "interrupts",
2240 sound_irq
, sizeof(sound_irq
));
2244 /* Make sure ethernet phy-handle property exists */
2245 fixup_device_tree_efika_add_phy();
2248 #define fixup_device_tree_efika()
2251 static void __init
fixup_device_tree(void)
2253 fixup_device_tree_maple();
2254 fixup_device_tree_chrp();
2255 fixup_device_tree_pmac();
2256 fixup_device_tree_efika();
2259 static void __init
prom_find_boot_cpu(void)
2261 struct prom_t
*_prom
= &RELOC(prom
);
2267 if (prom_getprop(_prom
->chosen
, "cpu", &prom_cpu
, sizeof(prom_cpu
)) <= 0)
2270 cpu_pkg
= call_prom("instance-to-package", 1, 1, prom_cpu
);
2272 prom_getprop(cpu_pkg
, "reg", &getprop_rval
, sizeof(getprop_rval
));
2273 _prom
->cpu
= getprop_rval
;
2275 prom_debug("Booting CPU hw index = 0x%x\n", _prom
->cpu
);
2278 static void __init
prom_check_initrd(unsigned long r3
, unsigned long r4
)
2280 #ifdef CONFIG_BLK_DEV_INITRD
2281 struct prom_t
*_prom
= &RELOC(prom
);
2283 if (r3
&& r4
&& r4
!= 0xdeadbeef) {
2286 RELOC(prom_initrd_start
) = is_kernel_addr(r3
) ? __pa(r3
) : r3
;
2287 RELOC(prom_initrd_end
) = RELOC(prom_initrd_start
) + r4
;
2289 val
= RELOC(prom_initrd_start
);
2290 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-start",
2292 val
= RELOC(prom_initrd_end
);
2293 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-end",
2296 reserve_mem(RELOC(prom_initrd_start
),
2297 RELOC(prom_initrd_end
) - RELOC(prom_initrd_start
));
2299 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start
));
2300 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end
));
2302 #endif /* CONFIG_BLK_DEV_INITRD */
2306 * We enter here early on, when the Open Firmware prom is still
2307 * handling exceptions and the MMU hash table for us.
2310 unsigned long __init
prom_init(unsigned long r3
, unsigned long r4
,
2312 unsigned long r6
, unsigned long r7
,
2313 unsigned long kbase
)
2315 struct prom_t
*_prom
;
2319 unsigned long offset
= reloc_offset();
2323 _prom
= &RELOC(prom
);
2326 * First zero the BSS
2328 memset(&RELOC(__bss_start
), 0, __bss_stop
- __bss_start
);
2331 * Init interface to Open Firmware, get some node references,
2334 prom_init_client_services(pp
);
2337 * See if this OF is old enough that we need to do explicit maps
2338 * and other workarounds
2343 * Init prom stdout device
2348 * Get default machine type. At this point, we do not differentiate
2349 * between pSeries SMP and pSeries LPAR
2351 RELOC(of_platform
) = prom_find_machine_type();
2353 #ifndef CONFIG_RELOCATABLE
2354 /* Bail if this is a kdump kernel. */
2355 if (PHYSICAL_START
> 0)
2356 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2360 * Check for an initrd
2362 prom_check_initrd(r3
, r4
);
2364 #ifdef CONFIG_PPC_PSERIES
2366 * On pSeries, inform the firmware about our capabilities
2368 if (RELOC(of_platform
) == PLATFORM_PSERIES
||
2369 RELOC(of_platform
) == PLATFORM_PSERIES_LPAR
)
2370 prom_send_capabilities();
2374 * Copy the CPU hold code
2376 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2377 copy_and_flush(0, kbase
, 0x100, 0);
2380 * Do early parsing of command line
2382 early_cmdline_parse();
2385 * Initialize memory management within prom_init
2390 * Determine which cpu is actually running right _now_
2392 prom_find_boot_cpu();
2395 * Initialize display devices
2397 prom_check_displays();
2401 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2402 * that uses the allocator, we need to make sure we get the top of memory
2403 * available for us here...
2405 if (RELOC(of_platform
) == PLATFORM_PSERIES
)
2406 prom_initialize_tce_table();
2410 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2411 * in spin-loops. PowerMacs don't have a working RTAS and use
2412 * a different way to spin CPUs
2414 if (RELOC(of_platform
) != PLATFORM_POWERMAC
) {
2415 prom_instantiate_rtas();
2420 * Fill in some infos for use by the kernel later on
2423 if (RELOC(prom_iommu_off
))
2424 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-off",
2427 if (RELOC(prom_iommu_force_on
))
2428 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-force-on",
2431 if (RELOC(prom_tce_alloc_start
)) {
2432 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-start",
2433 &RELOC(prom_tce_alloc_start
),
2434 sizeof(prom_tce_alloc_start
));
2435 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-end",
2436 &RELOC(prom_tce_alloc_end
),
2437 sizeof(prom_tce_alloc_end
));
2442 * Fixup any known bugs in the device-tree
2444 fixup_device_tree();
2447 * Now finally create the flattened device-tree
2449 prom_printf("copying OF device tree ...\n");
2450 flatten_device_tree();
2453 * in case stdin is USB and still active on IBM machines...
2454 * Unfortunately quiesce crashes on some powermacs if we have
2455 * closed stdin already (in particular the powerbook 101).
2457 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2461 * Call OF "quiesce" method to shut down pending DMA's from
2464 prom_printf("Calling quiesce ...\n");
2465 call_prom("quiesce", 0, 0);
2468 * And finally, call the kernel passing it the flattened device
2469 * tree and NULL as r5, thus triggering the new entry point which
2470 * is common to us and kexec
2472 hdr
= RELOC(dt_header_start
);
2473 prom_printf("returning from prom_init\n");
2474 prom_debug("->dt_header_start=0x%x\n", hdr
);
2477 reloc_got2(-offset
);
2480 __start(hdr
, kbase
, 0);