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 alloc_top
;
198 static unsigned long __initdata alloc_top_high
;
199 static unsigned long __initdata alloc_bottom
;
200 static unsigned long __initdata rmo_top
;
201 static unsigned long __initdata ram_top
;
203 static struct mem_map_entry __initdata mem_reserve_map
[MEM_RESERVE_MAP_SIZE
];
204 static int __initdata mem_reserve_cnt
;
206 static cell_t __initdata regbuf
[1024];
209 #define MAX_CPU_THREADS 2
212 * Error results ... some OF calls will return "-1" on error, some
213 * will return 0, some will return either. To simplify, here are
214 * macros to use with any ihandle or phandle return value to check if
218 #define PROM_ERROR (-1u)
219 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR)
220 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR)
223 /* This is the one and *ONLY* place where we actually call open
227 static int __init
call_prom(const char *service
, int nargs
, int nret
, ...)
230 struct prom_args args
;
233 args
.service
= ADDR(service
);
237 va_start(list
, nret
);
238 for (i
= 0; i
< nargs
; i
++)
239 args
.args
[i
] = va_arg(list
, prom_arg_t
);
242 for (i
= 0; i
< nret
; i
++)
243 args
.args
[nargs
+i
] = 0;
245 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
248 return (nret
> 0) ? args
.args
[nargs
] : 0;
251 static int __init
call_prom_ret(const char *service
, int nargs
, int nret
,
252 prom_arg_t
*rets
, ...)
255 struct prom_args args
;
258 args
.service
= ADDR(service
);
262 va_start(list
, rets
);
263 for (i
= 0; i
< nargs
; i
++)
264 args
.args
[i
] = va_arg(list
, prom_arg_t
);
267 for (i
= 0; i
< nret
; i
++)
268 args
.args
[nargs
+i
] = 0;
270 if (enter_prom(&args
, RELOC(prom_entry
)) < 0)
274 for (i
= 1; i
< nret
; ++i
)
275 rets
[i
-1] = args
.args
[nargs
+i
];
277 return (nret
> 0) ? args
.args
[nargs
] : 0;
281 static void __init
prom_print(const char *msg
)
284 struct prom_t
*_prom
= &RELOC(prom
);
286 if (_prom
->stdout
== 0)
289 for (p
= msg
; *p
!= 0; p
= q
) {
290 for (q
= p
; *q
!= 0 && *q
!= '\n'; ++q
)
293 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
297 call_prom("write", 3, 1, _prom
->stdout
, ADDR("\r\n"), 2);
302 static void __init
prom_print_hex(unsigned long val
)
304 int i
, nibbles
= sizeof(val
)*2;
305 char buf
[sizeof(val
)*2+1];
306 struct prom_t
*_prom
= &RELOC(prom
);
308 for (i
= nibbles
-1; i
>= 0; i
--) {
309 buf
[i
] = (val
& 0xf) + '0';
311 buf
[i
] += ('a'-'0'-10);
315 call_prom("write", 3, 1, _prom
->stdout
, buf
, nibbles
);
319 static void __init
prom_printf(const char *format
, ...)
321 const char *p
, *q
, *s
;
324 struct prom_t
*_prom
= &RELOC(prom
);
326 va_start(args
, format
);
328 format
= PTRRELOC(format
);
330 for (p
= format
; *p
!= 0; p
= q
) {
331 for (q
= p
; *q
!= 0 && *q
!= '\n' && *q
!= '%'; ++q
)
334 call_prom("write", 3, 1, _prom
->stdout
, p
, q
- p
);
339 call_prom("write", 3, 1, _prom
->stdout
,
349 s
= va_arg(args
, const char *);
354 v
= va_arg(args
, unsigned long);
362 static unsigned int __init
prom_claim(unsigned long virt
, unsigned long size
,
365 struct prom_t
*_prom
= &RELOC(prom
);
367 if (align
== 0 && (OF_WORKAROUNDS
& OF_WA_CLAIM
)) {
369 * Old OF requires we claim physical and virtual separately
370 * and then map explicitly (assuming virtual mode)
375 ret
= call_prom_ret("call-method", 5, 2, &result
,
376 ADDR("claim"), _prom
->memory
,
378 if (ret
!= 0 || result
== -1)
380 ret
= call_prom_ret("call-method", 5, 2, &result
,
381 ADDR("claim"), _prom
->mmumap
,
384 call_prom("call-method", 4, 1, ADDR("release"),
385 _prom
->memory
, size
, virt
);
388 /* the 0x12 is M (coherence) + PP == read/write */
389 call_prom("call-method", 6, 1,
390 ADDR("map"), _prom
->mmumap
, 0x12, size
, virt
, virt
);
393 return call_prom("claim", 3, 1, (prom_arg_t
)virt
, (prom_arg_t
)size
,
397 static void __init
__attribute__((noreturn
)) prom_panic(const char *reason
)
400 reason
= PTRRELOC(reason
);
403 /* Do not call exit because it clears the screen on pmac
404 * it also causes some sort of double-fault on early pmacs */
405 if (RELOC(of_platform
) == PLATFORM_POWERMAC
)
408 /* ToDo: should put up an SRC here on p/iSeries */
409 call_prom("exit", 0, 0);
411 for (;;) /* should never get here */
416 static int __init
prom_next_node(phandle
*nodep
)
420 if ((node
= *nodep
) != 0
421 && (*nodep
= call_prom("child", 1, 1, node
)) != 0)
423 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
426 if ((node
= call_prom("parent", 1, 1, node
)) == 0)
428 if ((*nodep
= call_prom("peer", 1, 1, node
)) != 0)
433 static int inline prom_getprop(phandle node
, const char *pname
,
434 void *value
, size_t valuelen
)
436 return call_prom("getprop", 4, 1, node
, ADDR(pname
),
437 (u32
)(unsigned long) value
, (u32
) valuelen
);
440 static int inline prom_getproplen(phandle node
, const char *pname
)
442 return call_prom("getproplen", 2, 1, node
, ADDR(pname
));
445 static void add_string(char **str
, const char *q
)
455 static char *tohex(unsigned int x
)
457 static char digits
[] = "0123456789abcdef";
458 static char result
[9];
465 result
[i
] = digits
[x
& 0xf];
467 } while (x
!= 0 && i
> 0);
471 static int __init
prom_setprop(phandle node
, const char *nodename
,
472 const char *pname
, void *value
, size_t valuelen
)
476 if (!(OF_WORKAROUNDS
& OF_WA_LONGTRAIL
))
477 return call_prom("setprop", 4, 1, node
, ADDR(pname
),
478 (u32
)(unsigned long) value
, (u32
) valuelen
);
480 /* gah... setprop doesn't work on longtrail, have to use interpret */
482 add_string(&p
, "dev");
483 add_string(&p
, nodename
);
484 add_string(&p
, tohex((u32
)(unsigned long) value
));
485 add_string(&p
, tohex(valuelen
));
486 add_string(&p
, tohex(ADDR(pname
)));
487 add_string(&p
, tohex(strlen(RELOC(pname
))));
488 add_string(&p
, "property");
490 return call_prom("interpret", 1, 1, (u32
)(unsigned long) cmd
);
493 /* We can't use the standard versions because of RELOC headaches. */
494 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
495 || ('a' <= (c) && (c) <= 'f') \
496 || ('A' <= (c) && (c) <= 'F'))
498 #define isdigit(c) ('0' <= (c) && (c) <= '9')
499 #define islower(c) ('a' <= (c) && (c) <= 'z')
500 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c))
502 unsigned long prom_strtoul(const char *cp
, const char **endp
)
504 unsigned long result
= 0, base
= 10, value
;
509 if (toupper(*cp
) == 'X') {
515 while (isxdigit(*cp
) &&
516 (value
= isdigit(*cp
) ? *cp
- '0' : toupper(*cp
) - 'A' + 10) < base
) {
517 result
= result
* base
+ value
;
527 unsigned long prom_memparse(const char *ptr
, const char **retptr
)
529 unsigned long ret
= prom_strtoul(ptr
, retptr
);
533 * We can't use a switch here because GCC *may* generate a
534 * jump table which won't work, because we're not running at
535 * the address we're linked at.
537 if ('G' == **retptr
|| 'g' == **retptr
)
540 if ('M' == **retptr
|| 'm' == **retptr
)
543 if ('K' == **retptr
|| 'k' == **retptr
)
555 * Early parsing of the command line passed to the kernel, used for
556 * "mem=x" and the options that affect the iommu
558 static void __init
early_cmdline_parse(void)
560 struct prom_t
*_prom
= &RELOC(prom
);
565 RELOC(prom_cmd_line
[0]) = 0;
566 p
= RELOC(prom_cmd_line
);
567 if ((long)_prom
->chosen
> 0)
568 l
= prom_getprop(_prom
->chosen
, "bootargs", p
, COMMAND_LINE_SIZE
-1);
569 #ifdef CONFIG_CMDLINE
570 if (l
<= 0 || p
[0] == '\0') /* dbl check */
571 strlcpy(RELOC(prom_cmd_line
),
572 RELOC(CONFIG_CMDLINE
), sizeof(prom_cmd_line
));
573 #endif /* CONFIG_CMDLINE */
574 prom_printf("command line: %s\n", RELOC(prom_cmd_line
));
577 opt
= strstr(RELOC(prom_cmd_line
), RELOC("iommu="));
579 prom_printf("iommu opt is: %s\n", opt
);
581 while (*opt
&& *opt
== ' ')
583 if (!strncmp(opt
, RELOC("off"), 3))
584 RELOC(ppc64_iommu_off
) = 1;
585 else if (!strncmp(opt
, RELOC("force"), 5))
586 RELOC(iommu_force_on
) = 1;
591 #ifdef CONFIG_PPC_PSERIES
593 * There are two methods for telling firmware what our capabilities are.
594 * Newer machines have an "ibm,client-architecture-support" method on the
595 * root node. For older machines, we have to call the "process-elf-header"
596 * method in the /packages/elf-loader node, passing it a fake 32-bit
597 * ELF header containing a couple of PT_NOTE sections that contain
598 * structures that contain various information.
602 * New method - extensible architecture description vector.
604 * Because the description vector contains a mix of byte and word
605 * values, we declare it as an unsigned char array, and use this
606 * macro to put word values in.
608 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \
609 ((x) >> 8) & 0xff, (x) & 0xff
611 /* Option vector bits - generic bits in byte 1 */
612 #define OV_IGNORE 0x80 /* ignore this vector */
613 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/
615 /* Option vector 1: processor architectures supported */
616 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */
617 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */
618 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */
619 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */
620 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */
621 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */
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 */
630 /* Option vector 5: PAPR/OF options supported */
631 #define OV5_LPAR 0x80 /* logical partitioning supported */
632 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */
633 /* ibm,dynamic-reconfiguration-memory property supported */
634 #define OV5_DRCONF_MEMORY 0x20
635 #define OV5_LARGE_PAGES 0x10 /* large pages supported */
638 * The architecture vector has an array of PVR mask/value pairs,
639 * followed by # option vectors - 1, followed by the option vectors.
641 static unsigned char ibm_architecture_vec
[] = {
642 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */
643 W(0xffff0000), W(0x003e0000), /* POWER6 */
644 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */
645 5 - 1, /* 5 option vectors */
647 /* option vector 1: processor architectures supported */
649 0, /* don't ignore, don't halt */
650 OV1_PPC_2_00
| OV1_PPC_2_01
| OV1_PPC_2_02
| OV1_PPC_2_03
|
651 OV1_PPC_2_04
| OV1_PPC_2_05
,
653 /* option vector 2: Open Firmware options supported */
657 W(0xffffffff), /* real_base */
658 W(0xffffffff), /* real_size */
659 W(0xffffffff), /* virt_base */
660 W(0xffffffff), /* virt_size */
661 W(0xffffffff), /* load_base */
662 W(64), /* 128MB min RMA */
663 W(0xffffffff), /* full client load */
664 0, /* min RMA percentage of total RAM */
665 48, /* max log_2(hash table size) */
667 /* option vector 3: processor options supported */
669 0, /* don't ignore, don't halt */
672 /* option vector 4: IBM PAPR implementation */
676 /* option vector 5: PAPR/OF options */
678 0, /* don't ignore, don't halt */
679 OV5_LPAR
| OV5_SPLPAR
| OV5_LARGE_PAGES
,
682 /* Old method - ELF header with PT_NOTE sections */
683 static struct fake_elf
{
690 char name
[8]; /* "PowerPC" */
704 char name
[24]; /* "IBM,RPA-Client-Config" */
718 .e_ident
= { 0x7f, 'E', 'L', 'F',
719 ELFCLASS32
, ELFDATA2MSB
, EV_CURRENT
},
720 .e_type
= ET_EXEC
, /* yeah right */
722 .e_version
= EV_CURRENT
,
723 .e_phoff
= offsetof(struct fake_elf
, phdr
),
724 .e_phentsize
= sizeof(Elf32_Phdr
),
730 .p_offset
= offsetof(struct fake_elf
, chrpnote
),
731 .p_filesz
= sizeof(struct chrpnote
)
734 .p_offset
= offsetof(struct fake_elf
, rpanote
),
735 .p_filesz
= sizeof(struct rpanote
)
739 .namesz
= sizeof("PowerPC"),
740 .descsz
= sizeof(struct chrpdesc
),
744 .real_mode
= ~0U, /* ~0 means "don't care" */
753 .namesz
= sizeof("IBM,RPA-Client-Config"),
754 .descsz
= sizeof(struct rpadesc
),
756 .name
= "IBM,RPA-Client-Config",
759 .min_rmo_size
= 64, /* in megabytes */
760 .min_rmo_percent
= 0,
761 .max_pft_size
= 48, /* 2^48 bytes max PFT size */
769 static void __init
prom_send_capabilities(void)
771 ihandle elfloader
, root
;
774 root
= call_prom("open", 1, 1, ADDR("/"));
776 /* try calling the ibm,client-architecture-support method */
777 if (call_prom_ret("call-method", 3, 2, &ret
,
778 ADDR("ibm,client-architecture-support"),
780 ADDR(ibm_architecture_vec
)) == 0) {
781 /* the call exists... */
783 prom_printf("WARNING: ibm,client-architecture"
784 "-support call FAILED!\n");
785 call_prom("close", 1, 0, root
);
788 call_prom("close", 1, 0, root
);
791 /* no ibm,client-architecture-support call, try the old way */
792 elfloader
= call_prom("open", 1, 1, ADDR("/packages/elf-loader"));
793 if (elfloader
== 0) {
794 prom_printf("couldn't open /packages/elf-loader\n");
797 call_prom("call-method", 3, 1, ADDR("process-elf-header"),
798 elfloader
, ADDR(&fake_elf
));
799 call_prom("close", 1, 0, elfloader
);
804 * Memory allocation strategy... our layout is normally:
806 * at 14Mb or more we have vmlinux, then a gap and initrd. In some
807 * rare cases, initrd might end up being before the kernel though.
808 * We assume this won't override the final kernel at 0, we have no
809 * provision to handle that in this version, but it should hopefully
812 * alloc_top is set to the top of RMO, eventually shrink down if the
815 * alloc_bottom is set to the top of kernel/initrd
817 * from there, allocations are done this way : rtas is allocated
818 * topmost, and the device-tree is allocated from the bottom. We try
819 * to grow the device-tree allocation as we progress. If we can't,
820 * then we fail, we don't currently have a facility to restart
821 * elsewhere, but that shouldn't be necessary.
823 * Note that calls to reserve_mem have to be done explicitly, memory
824 * allocated with either alloc_up or alloc_down isn't automatically
830 * Allocates memory in the RMO upward from the kernel/initrd
832 * When align is 0, this is a special case, it means to allocate in place
833 * at the current location of alloc_bottom or fail (that is basically
834 * extending the previous allocation). Used for the device-tree flattening
836 static unsigned long __init
alloc_up(unsigned long size
, unsigned long align
)
838 unsigned long base
= RELOC(alloc_bottom
);
839 unsigned long addr
= 0;
842 base
= _ALIGN_UP(base
, align
);
843 prom_debug("alloc_up(%x, %x)\n", size
, align
);
844 if (RELOC(ram_top
) == 0)
845 prom_panic("alloc_up() called with mem not initialized\n");
848 base
= _ALIGN_UP(RELOC(alloc_bottom
), align
);
850 base
= RELOC(alloc_bottom
);
852 for(; (base
+ size
) <= RELOC(alloc_top
);
853 base
= _ALIGN_UP(base
+ 0x100000, align
)) {
854 prom_debug(" trying: 0x%x\n\r", base
);
855 addr
= (unsigned long)prom_claim(base
, size
, 0);
856 if (addr
!= PROM_ERROR
&& addr
!= 0)
864 RELOC(alloc_bottom
) = addr
;
866 prom_debug(" -> %x\n", addr
);
867 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
868 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
869 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
870 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
871 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
877 * Allocates memory downward, either from top of RMO, or if highmem
878 * is set, from the top of RAM. Note that this one doesn't handle
879 * failures. It does claim memory if highmem is not set.
881 static unsigned long __init
alloc_down(unsigned long size
, unsigned long align
,
884 unsigned long base
, addr
= 0;
886 prom_debug("alloc_down(%x, %x, %s)\n", size
, align
,
887 highmem
? RELOC("(high)") : RELOC("(low)"));
888 if (RELOC(ram_top
) == 0)
889 prom_panic("alloc_down() called with mem not initialized\n");
892 /* Carve out storage for the TCE table. */
893 addr
= _ALIGN_DOWN(RELOC(alloc_top_high
) - size
, align
);
894 if (addr
<= RELOC(alloc_bottom
))
896 /* Will we bump into the RMO ? If yes, check out that we
897 * didn't overlap existing allocations there, if we did,
898 * we are dead, we must be the first in town !
900 if (addr
< RELOC(rmo_top
)) {
901 /* Good, we are first */
902 if (RELOC(alloc_top
) == RELOC(rmo_top
))
903 RELOC(alloc_top
) = RELOC(rmo_top
) = addr
;
907 RELOC(alloc_top_high
) = addr
;
911 base
= _ALIGN_DOWN(RELOC(alloc_top
) - size
, align
);
912 for (; base
> RELOC(alloc_bottom
);
913 base
= _ALIGN_DOWN(base
- 0x100000, align
)) {
914 prom_debug(" trying: 0x%x\n\r", base
);
915 addr
= (unsigned long)prom_claim(base
, size
, 0);
916 if (addr
!= PROM_ERROR
&& addr
!= 0)
922 RELOC(alloc_top
) = addr
;
925 prom_debug(" -> %x\n", addr
);
926 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
927 prom_debug(" alloc_top : %x\n", RELOC(alloc_top
));
928 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
929 prom_debug(" rmo_top : %x\n", RELOC(rmo_top
));
930 prom_debug(" ram_top : %x\n", RELOC(ram_top
));
938 static unsigned long __init
prom_next_cell(int s
, cell_t
**cellp
)
943 /* Ignore more than 2 cells */
944 while (s
> sizeof(unsigned long) / 4) {
960 * Very dumb function for adding to the memory reserve list, but
961 * we don't need anything smarter at this point
963 * XXX Eventually check for collisions. They should NEVER happen.
964 * If problems seem to show up, it would be a good start to track
967 static void reserve_mem(u64 base
, u64 size
)
969 u64 top
= base
+ size
;
970 unsigned long cnt
= RELOC(mem_reserve_cnt
);
975 /* We need to always keep one empty entry so that we
976 * have our terminator with "size" set to 0 since we are
977 * dumb and just copy this entire array to the boot params
979 base
= _ALIGN_DOWN(base
, PAGE_SIZE
);
980 top
= _ALIGN_UP(top
, PAGE_SIZE
);
983 if (cnt
>= (MEM_RESERVE_MAP_SIZE
- 1))
984 prom_panic("Memory reserve map exhausted !\n");
985 RELOC(mem_reserve_map
)[cnt
].base
= base
;
986 RELOC(mem_reserve_map
)[cnt
].size
= size
;
987 RELOC(mem_reserve_cnt
) = cnt
+ 1;
991 * Initialize memory allocation mecanism, parse "memory" nodes and
992 * obtain that way the top of memory and RMO to setup out local allocator
994 static void __init
prom_init_mem(void)
997 char *path
, type
[64];
1000 struct prom_t
*_prom
= &RELOC(prom
);
1004 * We iterate the memory nodes to find
1005 * 1) top of RMO (first node)
1009 prom_getprop(_prom
->root
, "#address-cells", &rac
, sizeof(rac
));
1011 prom_getprop(_prom
->root
, "#size-cells", &rsc
, sizeof(rsc
));
1012 prom_debug("root_addr_cells: %x\n", (unsigned long) rac
);
1013 prom_debug("root_size_cells: %x\n", (unsigned long) rsc
);
1015 prom_debug("scanning memory:\n");
1016 path
= RELOC(prom_scratch
);
1018 for (node
= 0; prom_next_node(&node
); ) {
1020 prom_getprop(node
, "device_type", type
, sizeof(type
));
1024 * CHRP Longtrail machines have no device_type
1025 * on the memory node, so check the name instead...
1027 prom_getprop(node
, "name", type
, sizeof(type
));
1029 if (strcmp(type
, RELOC("memory")))
1032 plen
= prom_getprop(node
, "reg", RELOC(regbuf
), sizeof(regbuf
));
1033 if (plen
> sizeof(regbuf
)) {
1034 prom_printf("memory node too large for buffer !\n");
1035 plen
= sizeof(regbuf
);
1038 endp
= p
+ (plen
/ sizeof(cell_t
));
1041 memset(path
, 0, PROM_SCRATCH_SIZE
);
1042 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1043 prom_debug(" node %s :\n", path
);
1044 #endif /* DEBUG_PROM */
1046 while ((endp
- p
) >= (rac
+ rsc
)) {
1047 unsigned long base
, size
;
1049 base
= prom_next_cell(rac
, &p
);
1050 size
= prom_next_cell(rsc
, &p
);
1054 prom_debug(" %x %x\n", base
, size
);
1055 if (base
== 0 && (RELOC(of_platform
) & PLATFORM_LPAR
))
1056 RELOC(rmo_top
) = size
;
1057 if ((base
+ size
) > RELOC(ram_top
))
1058 RELOC(ram_top
) = base
+ size
;
1062 RELOC(alloc_bottom
) = PAGE_ALIGN((unsigned long)&RELOC(_end
) + 0x4000);
1064 /* Check if we have an initrd after the kernel, if we do move our bottom
1067 if (RELOC(prom_initrd_start
)) {
1068 if (RELOC(prom_initrd_end
) > RELOC(alloc_bottom
))
1069 RELOC(alloc_bottom
) = PAGE_ALIGN(RELOC(prom_initrd_end
));
1073 * Setup our top alloc point, that is top of RMO or top of
1074 * segment 0 when running non-LPAR.
1075 * Some RS64 machines have buggy firmware where claims up at
1076 * 1GB fail. Cap at 768MB as a workaround.
1077 * Since 768MB is plenty of room, and we need to cap to something
1078 * reasonable on 32-bit, cap at 768MB on all machines.
1080 if (!RELOC(rmo_top
))
1081 RELOC(rmo_top
) = RELOC(ram_top
);
1082 RELOC(rmo_top
) = min(0x30000000ul
, RELOC(rmo_top
));
1083 RELOC(alloc_top
) = RELOC(rmo_top
);
1084 RELOC(alloc_top_high
) = RELOC(ram_top
);
1086 prom_printf("memory layout at init:\n");
1087 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom
));
1088 prom_printf(" alloc_top : %x\n", RELOC(alloc_top
));
1089 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high
));
1090 prom_printf(" rmo_top : %x\n", RELOC(rmo_top
));
1091 prom_printf(" ram_top : %x\n", RELOC(ram_top
));
1096 * Allocate room for and instantiate RTAS
1098 static void __init
prom_instantiate_rtas(void)
1102 u32 base
, entry
= 0;
1105 prom_debug("prom_instantiate_rtas: start...\n");
1107 rtas_node
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1108 prom_debug("rtas_node: %x\n", rtas_node
);
1109 if (!PHANDLE_VALID(rtas_node
))
1112 prom_getprop(rtas_node
, "rtas-size", &size
, sizeof(size
));
1116 base
= alloc_down(size
, PAGE_SIZE
, 0);
1118 prom_printf("RTAS allocation failed !\n");
1122 rtas_inst
= call_prom("open", 1, 1, ADDR("/rtas"));
1123 if (!IHANDLE_VALID(rtas_inst
)) {
1124 prom_printf("opening rtas package failed (%x)\n", rtas_inst
);
1128 prom_printf("instantiating rtas at 0x%x ...", base
);
1130 if (call_prom_ret("call-method", 3, 2, &entry
,
1131 ADDR("instantiate-rtas"),
1132 rtas_inst
, base
) != 0
1134 prom_printf(" failed\n");
1137 prom_printf(" done\n");
1139 reserve_mem(base
, size
);
1141 prom_setprop(rtas_node
, "/rtas", "linux,rtas-base",
1142 &base
, sizeof(base
));
1143 prom_setprop(rtas_node
, "/rtas", "linux,rtas-entry",
1144 &entry
, sizeof(entry
));
1146 prom_debug("rtas base = 0x%x\n", base
);
1147 prom_debug("rtas entry = 0x%x\n", entry
);
1148 prom_debug("rtas size = 0x%x\n", (long)size
);
1150 prom_debug("prom_instantiate_rtas: end...\n");
1155 * Allocate room for and initialize TCE tables
1157 static void __init
prom_initialize_tce_table(void)
1161 char compatible
[64], type
[64], model
[64];
1162 char *path
= RELOC(prom_scratch
);
1164 u32 minalign
, minsize
;
1165 u64 tce_entry
, *tce_entryp
;
1166 u64 local_alloc_top
, local_alloc_bottom
;
1169 if (RELOC(ppc64_iommu_off
))
1172 prom_debug("starting prom_initialize_tce_table\n");
1174 /* Cache current top of allocs so we reserve a single block */
1175 local_alloc_top
= RELOC(alloc_top_high
);
1176 local_alloc_bottom
= local_alloc_top
;
1178 /* Search all nodes looking for PHBs. */
1179 for (node
= 0; prom_next_node(&node
); ) {
1183 prom_getprop(node
, "compatible",
1184 compatible
, sizeof(compatible
));
1185 prom_getprop(node
, "device_type", type
, sizeof(type
));
1186 prom_getprop(node
, "model", model
, sizeof(model
));
1188 if ((type
[0] == 0) || (strstr(type
, RELOC("pci")) == NULL
))
1191 /* Keep the old logic in tack to avoid regression. */
1192 if (compatible
[0] != 0) {
1193 if ((strstr(compatible
, RELOC("python")) == NULL
) &&
1194 (strstr(compatible
, RELOC("Speedwagon")) == NULL
) &&
1195 (strstr(compatible
, RELOC("Winnipeg")) == NULL
))
1197 } else if (model
[0] != 0) {
1198 if ((strstr(model
, RELOC("ython")) == NULL
) &&
1199 (strstr(model
, RELOC("peedwagon")) == NULL
) &&
1200 (strstr(model
, RELOC("innipeg")) == NULL
))
1204 if (prom_getprop(node
, "tce-table-minalign", &minalign
,
1205 sizeof(minalign
)) == PROM_ERROR
)
1207 if (prom_getprop(node
, "tce-table-minsize", &minsize
,
1208 sizeof(minsize
)) == PROM_ERROR
)
1209 minsize
= 4UL << 20;
1212 * Even though we read what OF wants, we just set the table
1213 * size to 4 MB. This is enough to map 2GB of PCI DMA space.
1214 * By doing this, we avoid the pitfalls of trying to DMA to
1215 * MMIO space and the DMA alias hole.
1217 * On POWER4, firmware sets the TCE region by assuming
1218 * each TCE table is 8MB. Using this memory for anything
1219 * else will impact performance, so we always allocate 8MB.
1222 if (__is_processor(PV_POWER4
) || __is_processor(PV_POWER4p
))
1223 minsize
= 8UL << 20;
1225 minsize
= 4UL << 20;
1227 /* Align to the greater of the align or size */
1228 align
= max(minalign
, minsize
);
1229 base
= alloc_down(minsize
, align
, 1);
1231 prom_panic("ERROR, cannot find space for TCE table.\n");
1232 if (base
< local_alloc_bottom
)
1233 local_alloc_bottom
= base
;
1235 /* It seems OF doesn't null-terminate the path :-( */
1236 memset(path
, 0, sizeof(path
));
1237 /* Call OF to setup the TCE hardware */
1238 if (call_prom("package-to-path", 3, 1, node
,
1239 path
, PROM_SCRATCH_SIZE
-1) == PROM_ERROR
) {
1240 prom_printf("package-to-path failed\n");
1243 /* Save away the TCE table attributes for later use. */
1244 prom_setprop(node
, path
, "linux,tce-base", &base
, sizeof(base
));
1245 prom_setprop(node
, path
, "linux,tce-size", &minsize
, sizeof(minsize
));
1247 prom_debug("TCE table: %s\n", path
);
1248 prom_debug("\tnode = 0x%x\n", node
);
1249 prom_debug("\tbase = 0x%x\n", base
);
1250 prom_debug("\tsize = 0x%x\n", minsize
);
1252 /* Initialize the table to have a one-to-one mapping
1253 * over the allocated size.
1255 tce_entryp
= (unsigned long *)base
;
1256 for (i
= 0; i
< (minsize
>> 3) ;tce_entryp
++, i
++) {
1257 tce_entry
= (i
<< PAGE_SHIFT
);
1259 *tce_entryp
= tce_entry
;
1262 prom_printf("opening PHB %s", path
);
1263 phb_node
= call_prom("open", 1, 1, path
);
1265 prom_printf("... failed\n");
1267 prom_printf("... done\n");
1269 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),
1270 phb_node
, -1, minsize
,
1271 (u32
) base
, (u32
) (base
>> 32));
1272 call_prom("close", 1, 0, phb_node
);
1275 reserve_mem(local_alloc_bottom
, local_alloc_top
- local_alloc_bottom
);
1277 /* These are only really needed if there is a memory limit in
1278 * effect, but we don't know so export them always. */
1279 RELOC(prom_tce_alloc_start
) = local_alloc_bottom
;
1280 RELOC(prom_tce_alloc_end
) = local_alloc_top
;
1282 /* Flag the first invalid entry */
1283 prom_debug("ending prom_initialize_tce_table\n");
1288 * With CHRP SMP we need to use the OF to start the other processors.
1289 * We can't wait until smp_boot_cpus (the OF is trashed by then)
1290 * so we have to put the processors into a holding pattern controlled
1291 * by the kernel (not OF) before we destroy the OF.
1293 * This uses a chunk of low memory, puts some holding pattern
1294 * code there and sends the other processors off to there until
1295 * smp_boot_cpus tells them to do something. The holding pattern
1296 * checks that address until its cpu # is there, when it is that
1297 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care
1298 * of setting those values.
1300 * We also use physical address 0x4 here to tell when a cpu
1301 * is in its holding pattern code.
1305 extern void __secondary_hold(void);
1306 extern unsigned long __secondary_hold_spinloop
;
1307 extern unsigned long __secondary_hold_acknowledge
;
1310 * We want to reference the copy of __secondary_hold_* in the
1311 * 0 - 0x100 address range
1313 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff)
1315 static void __init
prom_hold_cpus(void)
1322 unsigned int interrupt_server
[MAX_CPU_THREADS
];
1323 unsigned int cpu_threads
, hw_cpu_num
;
1325 struct prom_t
*_prom
= &RELOC(prom
);
1326 unsigned long *spinloop
1327 = (void *) LOW_ADDR(__secondary_hold_spinloop
);
1328 unsigned long *acknowledge
1329 = (void *) LOW_ADDR(__secondary_hold_acknowledge
);
1331 /* __secondary_hold is actually a descriptor, not the text address */
1332 unsigned long secondary_hold
1333 = __pa(*PTRRELOC((unsigned long *)__secondary_hold
));
1335 unsigned long secondary_hold
= LOW_ADDR(__secondary_hold
);
1338 prom_debug("prom_hold_cpus: start...\n");
1339 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop
);
1340 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop
);
1341 prom_debug(" 1) acknowledge = 0x%x\n",
1342 (unsigned long)acknowledge
);
1343 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge
);
1344 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold
);
1346 /* Set the common spinloop variable, so all of the secondary cpus
1347 * will block when they are awakened from their OF spinloop.
1348 * This must occur for both SMP and non SMP kernels, since OF will
1349 * be trashed when we move the kernel.
1354 for (node
= 0; prom_next_node(&node
); ) {
1356 prom_getprop(node
, "device_type", type
, sizeof(type
));
1357 if (strcmp(type
, RELOC("cpu")) != 0)
1360 /* Skip non-configured cpus. */
1361 if (prom_getprop(node
, "status", type
, sizeof(type
)) > 0)
1362 if (strcmp(type
, RELOC("okay")) != 0)
1366 prom_getprop(node
, "reg", ®
, sizeof(reg
));
1368 prom_debug("\ncpuid = 0x%x\n", cpuid
);
1369 prom_debug("cpu hw idx = 0x%x\n", reg
);
1371 /* Init the acknowledge var which will be reset by
1372 * the secondary cpu when it awakens from its OF
1375 *acknowledge
= (unsigned long)-1;
1377 propsize
= prom_getprop(node
, "ibm,ppc-interrupt-server#s",
1379 sizeof(interrupt_server
));
1381 /* no property. old hardware has no SMT */
1383 interrupt_server
[0] = reg
; /* fake it with phys id */
1385 /* We have a threaded processor */
1386 cpu_threads
= propsize
/ sizeof(u32
);
1387 if (cpu_threads
> MAX_CPU_THREADS
) {
1388 prom_printf("SMT: too many threads!\n"
1389 "SMT: found %x, max is %x\n",
1390 cpu_threads
, MAX_CPU_THREADS
);
1391 cpu_threads
= 1; /* ToDo: panic? */
1395 hw_cpu_num
= interrupt_server
[0];
1396 if (hw_cpu_num
!= _prom
->cpu
) {
1397 /* Primary Thread of non-boot cpu */
1398 prom_printf("%x : starting cpu hw idx %x... ", cpuid
, reg
);
1399 call_prom("start-cpu", 3, 0, node
,
1400 secondary_hold
, reg
);
1402 for (i
= 0; (i
< 100000000) &&
1403 (*acknowledge
== ((unsigned long)-1)); i
++ )
1406 if (*acknowledge
== reg
)
1407 prom_printf("done\n");
1409 prom_printf("failed: %x\n", *acknowledge
);
1413 prom_printf("%x : boot cpu %x\n", cpuid
, reg
);
1414 #endif /* CONFIG_SMP */
1416 /* Reserve cpu #s for secondary threads. They start later. */
1417 cpuid
+= cpu_threads
;
1420 if (cpuid
> NR_CPUS
)
1421 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS
)
1422 ") exceeded: ignoring extras\n");
1424 prom_debug("prom_hold_cpus: end...\n");
1428 static void __init
prom_init_client_services(unsigned long pp
)
1430 struct prom_t
*_prom
= &RELOC(prom
);
1432 /* Get a handle to the prom entry point before anything else */
1433 RELOC(prom_entry
) = pp
;
1435 /* get a handle for the stdout device */
1436 _prom
->chosen
= call_prom("finddevice", 1, 1, ADDR("/chosen"));
1437 if (!PHANDLE_VALID(_prom
->chosen
))
1438 prom_panic("cannot find chosen"); /* msg won't be printed :( */
1440 /* get device tree root */
1441 _prom
->root
= call_prom("finddevice", 1, 1, ADDR("/"));
1442 if (!PHANDLE_VALID(_prom
->root
))
1443 prom_panic("cannot find device tree root"); /* msg won't be printed :( */
1450 * For really old powermacs, we need to map things we claim.
1451 * For that, we need the ihandle of the mmu.
1452 * Also, on the longtrail, we need to work around other bugs.
1454 static void __init
prom_find_mmu(void)
1456 struct prom_t
*_prom
= &RELOC(prom
);
1460 oprom
= call_prom("finddevice", 1, 1, ADDR("/openprom"));
1461 if (!PHANDLE_VALID(oprom
))
1463 if (prom_getprop(oprom
, "model", version
, sizeof(version
)) <= 0)
1465 version
[sizeof(version
) - 1] = 0;
1466 /* XXX might need to add other versions here */
1467 if (strcmp(version
, "Open Firmware, 1.0.5") == 0)
1468 of_workarounds
= OF_WA_CLAIM
;
1469 else if (strncmp(version
, "FirmWorks,3.", 12) == 0) {
1470 of_workarounds
= OF_WA_CLAIM
| OF_WA_LONGTRAIL
;
1471 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");
1474 _prom
->memory
= call_prom("open", 1, 1, ADDR("/memory"));
1475 prom_getprop(_prom
->chosen
, "mmu", &_prom
->mmumap
,
1476 sizeof(_prom
->mmumap
));
1477 if (!IHANDLE_VALID(_prom
->memory
) || !IHANDLE_VALID(_prom
->mmumap
))
1478 of_workarounds
&= ~OF_WA_CLAIM
; /* hmmm */
1481 #define prom_find_mmu()
1484 static void __init
prom_init_stdout(void)
1486 struct prom_t
*_prom
= &RELOC(prom
);
1487 char *path
= RELOC(of_stdout_device
);
1491 if (prom_getprop(_prom
->chosen
, "stdout", &val
, sizeof(val
)) <= 0)
1492 prom_panic("cannot find stdout");
1494 _prom
->stdout
= val
;
1496 /* Get the full OF pathname of the stdout device */
1497 memset(path
, 0, 256);
1498 call_prom("instance-to-path", 3, 1, _prom
->stdout
, path
, 255);
1499 val
= call_prom("instance-to-package", 1, 1, _prom
->stdout
);
1500 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-package",
1502 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device
));
1503 prom_setprop(_prom
->chosen
, "/chosen", "linux,stdout-path",
1504 path
, strlen(path
) + 1);
1506 /* If it's a display, note it */
1507 memset(type
, 0, sizeof(type
));
1508 prom_getprop(val
, "device_type", type
, sizeof(type
));
1509 if (strcmp(type
, RELOC("display")) == 0)
1510 prom_setprop(val
, path
, "linux,boot-display", NULL
, 0);
1513 static void __init
prom_close_stdin(void)
1515 struct prom_t
*_prom
= &RELOC(prom
);
1518 if (prom_getprop(_prom
->chosen
, "stdin", &val
, sizeof(val
)) > 0)
1519 call_prom("close", 1, 0, val
);
1522 static int __init
prom_find_machine_type(void)
1524 struct prom_t
*_prom
= &RELOC(prom
);
1532 /* Look for a PowerMac */
1533 len
= prom_getprop(_prom
->root
, "compatible",
1534 compat
, sizeof(compat
)-1);
1538 char *p
= &compat
[i
];
1542 if (strstr(p
, RELOC("Power Macintosh")) ||
1543 strstr(p
, RELOC("MacRISC")))
1544 return PLATFORM_POWERMAC
;
1546 /* We must make sure we don't detect the IBM Cell
1547 * blades as pSeries due to some firmware issues,
1550 if (strstr(p
, RELOC("IBM,CBEA")) ||
1551 strstr(p
, RELOC("IBM,CPBW-1.0")))
1552 return PLATFORM_GENERIC
;
1553 #endif /* CONFIG_PPC64 */
1558 /* If not a mac, try to figure out if it's an IBM pSeries or any other
1559 * PAPR compliant platform. We assume it is if :
1560 * - /device_type is "chrp" (please, do NOT use that for future
1564 len
= prom_getprop(_prom
->root
, "device_type",
1565 compat
, sizeof(compat
)-1);
1567 return PLATFORM_GENERIC
;
1568 if (strcmp(compat
, RELOC("chrp")))
1569 return PLATFORM_GENERIC
;
1571 /* Default to pSeries. We need to know if we are running LPAR */
1572 rtas
= call_prom("finddevice", 1, 1, ADDR("/rtas"));
1573 if (!PHANDLE_VALID(rtas
))
1574 return PLATFORM_GENERIC
;
1575 x
= prom_getproplen(rtas
, "ibm,hypertas-functions");
1576 if (x
!= PROM_ERROR
) {
1577 prom_printf("Hypertas detected, assuming LPAR !\n");
1578 return PLATFORM_PSERIES_LPAR
;
1580 return PLATFORM_PSERIES
;
1582 return PLATFORM_GENERIC
;
1586 static int __init
prom_set_color(ihandle ih
, int i
, int r
, int g
, int b
)
1588 return call_prom("call-method", 6, 1, ADDR("color!"), ih
, i
, b
, g
, r
);
1592 * If we have a display that we don't know how to drive,
1593 * we will want to try to execute OF's open method for it
1594 * later. However, OF will probably fall over if we do that
1595 * we've taken over the MMU.
1596 * So we check whether we will need to open the display,
1597 * and if so, open it now.
1599 static void __init
prom_check_displays(void)
1601 char type
[16], *path
;
1606 static unsigned char default_colors
[] = {
1624 const unsigned char *clut
;
1626 prom_printf("Looking for displays\n");
1627 for (node
= 0; prom_next_node(&node
); ) {
1628 memset(type
, 0, sizeof(type
));
1629 prom_getprop(node
, "device_type", type
, sizeof(type
));
1630 if (strcmp(type
, RELOC("display")) != 0)
1633 /* It seems OF doesn't null-terminate the path :-( */
1634 path
= RELOC(prom_scratch
);
1635 memset(path
, 0, PROM_SCRATCH_SIZE
);
1638 * leave some room at the end of the path for appending extra
1641 if (call_prom("package-to-path", 3, 1, node
, path
,
1642 PROM_SCRATCH_SIZE
-10) == PROM_ERROR
)
1644 prom_printf("found display : %s, opening ... ", path
);
1646 ih
= call_prom("open", 1, 1, path
);
1648 prom_printf("failed\n");
1653 prom_printf("done\n");
1654 prom_setprop(node
, path
, "linux,opened", NULL
, 0);
1656 /* Setup a usable color table when the appropriate
1657 * method is available. Should update this to set-colors */
1658 clut
= RELOC(default_colors
);
1659 for (i
= 0; i
< 32; i
++, clut
+= 3)
1660 if (prom_set_color(ih
, i
, clut
[0], clut
[1],
1664 #ifdef CONFIG_LOGO_LINUX_CLUT224
1665 clut
= PTRRELOC(RELOC(logo_linux_clut224
.clut
));
1666 for (i
= 0; i
< RELOC(logo_linux_clut224
.clutsize
); i
++, clut
+= 3)
1667 if (prom_set_color(ih
, i
+ 32, clut
[0], clut
[1],
1670 #endif /* CONFIG_LOGO_LINUX_CLUT224 */
1675 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */
1676 static void __init
*make_room(unsigned long *mem_start
, unsigned long *mem_end
,
1677 unsigned long needed
, unsigned long align
)
1681 *mem_start
= _ALIGN(*mem_start
, align
);
1682 while ((*mem_start
+ needed
) > *mem_end
) {
1683 unsigned long room
, chunk
;
1685 prom_debug("Chunk exhausted, claiming more at %x...\n",
1686 RELOC(alloc_bottom
));
1687 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
);
1688 if (room
> DEVTREE_CHUNK_SIZE
)
1689 room
= DEVTREE_CHUNK_SIZE
;
1690 if (room
< PAGE_SIZE
)
1691 prom_panic("No memory for flatten_device_tree (no room)");
1692 chunk
= alloc_up(room
, 0);
1694 prom_panic("No memory for flatten_device_tree (claim failed)");
1695 *mem_end
= RELOC(alloc_top
);
1698 ret
= (void *)*mem_start
;
1699 *mem_start
+= needed
;
1704 #define dt_push_token(token, mem_start, mem_end) \
1705 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0)
1707 static unsigned long __init
dt_find_string(char *str
)
1711 s
= os
= (char *)RELOC(dt_string_start
);
1713 while (s
< (char *)RELOC(dt_string_end
)) {
1714 if (strcmp(s
, str
) == 0)
1722 * The Open Firmware 1275 specification states properties must be 31 bytes or
1723 * less, however not all firmwares obey this. Make it 64 bytes to be safe.
1725 #define MAX_PROPERTY_NAME 64
1727 static void __init
scan_dt_build_strings(phandle node
,
1728 unsigned long *mem_start
,
1729 unsigned long *mem_end
)
1731 char *prev_name
, *namep
, *sstart
;
1735 sstart
= (char *)RELOC(dt_string_start
);
1737 /* get and store all property names */
1738 prev_name
= RELOC("");
1740 /* 64 is max len of name including nul. */
1741 namep
= make_room(mem_start
, mem_end
, MAX_PROPERTY_NAME
, 1);
1742 if (call_prom("nextprop", 3, 1, node
, prev_name
, namep
) != 1) {
1743 /* No more nodes: unwind alloc */
1744 *mem_start
= (unsigned long)namep
;
1749 if (strcmp(namep
, RELOC("name")) == 0) {
1750 *mem_start
= (unsigned long)namep
;
1751 prev_name
= RELOC("name");
1754 /* get/create string entry */
1755 soff
= dt_find_string(namep
);
1757 *mem_start
= (unsigned long)namep
;
1758 namep
= sstart
+ soff
;
1760 /* Trim off some if we can */
1761 *mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1762 RELOC(dt_string_end
) = *mem_start
;
1767 /* do all our children */
1768 child
= call_prom("child", 1, 1, node
);
1769 while (child
!= 0) {
1770 scan_dt_build_strings(child
, mem_start
, mem_end
);
1771 child
= call_prom("peer", 1, 1, child
);
1775 static void __init
scan_dt_build_struct(phandle node
, unsigned long *mem_start
,
1776 unsigned long *mem_end
)
1779 char *namep
, *prev_name
, *sstart
, *p
, *ep
, *lp
, *path
;
1781 unsigned char *valp
;
1782 static char pname
[MAX_PROPERTY_NAME
];
1785 dt_push_token(OF_DT_BEGIN_NODE
, mem_start
, mem_end
);
1787 /* get the node's full name */
1788 namep
= (char *)*mem_start
;
1789 room
= *mem_end
- *mem_start
;
1792 l
= call_prom("package-to-path", 3, 1, node
, namep
, room
);
1794 /* Didn't fit? Get more room. */
1796 if (l
>= *mem_end
- *mem_start
)
1797 namep
= make_room(mem_start
, mem_end
, l
+1, 1);
1798 call_prom("package-to-path", 3, 1, node
, namep
, l
);
1802 /* Fixup an Apple bug where they have bogus \0 chars in the
1803 * middle of the path in some properties, and extract
1804 * the unit name (everything after the last '/').
1806 for (lp
= p
= namep
, ep
= namep
+ l
; p
< ep
; p
++) {
1813 *mem_start
= _ALIGN((unsigned long)lp
+ 1, 4);
1816 /* get it again for debugging */
1817 path
= RELOC(prom_scratch
);
1818 memset(path
, 0, PROM_SCRATCH_SIZE
);
1819 call_prom("package-to-path", 3, 1, node
, path
, PROM_SCRATCH_SIZE
-1);
1821 /* get and store all properties */
1822 prev_name
= RELOC("");
1823 sstart
= (char *)RELOC(dt_string_start
);
1825 if (call_prom("nextprop", 3, 1, node
, prev_name
,
1830 if (strcmp(RELOC(pname
), RELOC("name")) == 0) {
1831 prev_name
= RELOC("name");
1835 /* find string offset */
1836 soff
= dt_find_string(RELOC(pname
));
1838 prom_printf("WARNING: Can't find string index for"
1839 " <%s>, node %s\n", RELOC(pname
), path
);
1842 prev_name
= sstart
+ soff
;
1845 l
= call_prom("getproplen", 2, 1, node
, RELOC(pname
));
1848 if (l
== PROM_ERROR
)
1850 if (l
> MAX_PROPERTY_LENGTH
) {
1851 prom_printf("WARNING: ignoring large property ");
1852 /* It seems OF doesn't null-terminate the path :-( */
1853 prom_printf("[%s] ", path
);
1854 prom_printf("%s length 0x%x\n", RELOC(pname
), l
);
1858 /* push property head */
1859 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1860 dt_push_token(l
, mem_start
, mem_end
);
1861 dt_push_token(soff
, mem_start
, mem_end
);
1863 /* push property content */
1864 valp
= make_room(mem_start
, mem_end
, l
, 4);
1865 call_prom("getprop", 4, 1, node
, RELOC(pname
), valp
, l
);
1866 *mem_start
= _ALIGN(*mem_start
, 4);
1869 /* Add a "linux,phandle" property. */
1870 soff
= dt_find_string(RELOC("linux,phandle"));
1872 prom_printf("WARNING: Can't find string index for"
1873 " <linux-phandle> node %s\n", path
);
1875 dt_push_token(OF_DT_PROP
, mem_start
, mem_end
);
1876 dt_push_token(4, mem_start
, mem_end
);
1877 dt_push_token(soff
, mem_start
, mem_end
);
1878 valp
= make_room(mem_start
, mem_end
, 4, 4);
1879 *(u32
*)valp
= node
;
1882 /* do all our children */
1883 child
= call_prom("child", 1, 1, node
);
1884 while (child
!= 0) {
1885 scan_dt_build_struct(child
, mem_start
, mem_end
);
1886 child
= call_prom("peer", 1, 1, child
);
1889 dt_push_token(OF_DT_END_NODE
, mem_start
, mem_end
);
1892 static void __init
flatten_device_tree(void)
1895 unsigned long mem_start
, mem_end
, room
;
1896 struct boot_param_header
*hdr
;
1897 struct prom_t
*_prom
= &RELOC(prom
);
1902 * Check how much room we have between alloc top & bottom (+/- a
1903 * few pages), crop to 4Mb, as this is our "chuck" size
1905 room
= RELOC(alloc_top
) - RELOC(alloc_bottom
) - 0x4000;
1906 if (room
> DEVTREE_CHUNK_SIZE
)
1907 room
= DEVTREE_CHUNK_SIZE
;
1908 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom
));
1910 /* Now try to claim that */
1911 mem_start
= (unsigned long)alloc_up(room
, PAGE_SIZE
);
1913 prom_panic("Can't allocate initial device-tree chunk\n");
1914 mem_end
= RELOC(alloc_top
);
1916 /* Get root of tree */
1917 root
= call_prom("peer", 1, 1, (phandle
)0);
1918 if (root
== (phandle
)0)
1919 prom_panic ("couldn't get device tree root\n");
1921 /* Build header and make room for mem rsv map */
1922 mem_start
= _ALIGN(mem_start
, 4);
1923 hdr
= make_room(&mem_start
, &mem_end
,
1924 sizeof(struct boot_param_header
), 4);
1925 RELOC(dt_header_start
) = (unsigned long)hdr
;
1926 rsvmap
= make_room(&mem_start
, &mem_end
, sizeof(mem_reserve_map
), 8);
1928 /* Start of strings */
1929 mem_start
= PAGE_ALIGN(mem_start
);
1930 RELOC(dt_string_start
) = mem_start
;
1931 mem_start
+= 4; /* hole */
1933 /* Add "linux,phandle" in there, we'll need it */
1934 namep
= make_room(&mem_start
, &mem_end
, 16, 1);
1935 strcpy(namep
, RELOC("linux,phandle"));
1936 mem_start
= (unsigned long)namep
+ strlen(namep
) + 1;
1938 /* Build string array */
1939 prom_printf("Building dt strings...\n");
1940 scan_dt_build_strings(root
, &mem_start
, &mem_end
);
1941 RELOC(dt_string_end
) = mem_start
;
1943 /* Build structure */
1944 mem_start
= PAGE_ALIGN(mem_start
);
1945 RELOC(dt_struct_start
) = mem_start
;
1946 prom_printf("Building dt structure...\n");
1947 scan_dt_build_struct(root
, &mem_start
, &mem_end
);
1948 dt_push_token(OF_DT_END
, &mem_start
, &mem_end
);
1949 RELOC(dt_struct_end
) = PAGE_ALIGN(mem_start
);
1952 hdr
->boot_cpuid_phys
= _prom
->cpu
;
1953 hdr
->magic
= OF_DT_HEADER
;
1954 hdr
->totalsize
= RELOC(dt_struct_end
) - RELOC(dt_header_start
);
1955 hdr
->off_dt_struct
= RELOC(dt_struct_start
) - RELOC(dt_header_start
);
1956 hdr
->off_dt_strings
= RELOC(dt_string_start
) - RELOC(dt_header_start
);
1957 hdr
->dt_strings_size
= RELOC(dt_string_end
) - RELOC(dt_string_start
);
1958 hdr
->off_mem_rsvmap
= ((unsigned long)rsvmap
) - RELOC(dt_header_start
);
1959 hdr
->version
= OF_DT_VERSION
;
1960 /* Version 16 is not backward compatible */
1961 hdr
->last_comp_version
= 0x10;
1963 /* Copy the reserve map in */
1964 memcpy(rsvmap
, RELOC(mem_reserve_map
), sizeof(mem_reserve_map
));
1969 prom_printf("reserved memory map:\n");
1970 for (i
= 0; i
< RELOC(mem_reserve_cnt
); i
++)
1971 prom_printf(" %x - %x\n",
1972 RELOC(mem_reserve_map
)[i
].base
,
1973 RELOC(mem_reserve_map
)[i
].size
);
1976 /* Bump mem_reserve_cnt to cause further reservations to fail
1977 * since it's too late.
1979 RELOC(mem_reserve_cnt
) = MEM_RESERVE_MAP_SIZE
;
1981 prom_printf("Device tree strings 0x%x -> 0x%x\n",
1982 RELOC(dt_string_start
), RELOC(dt_string_end
));
1983 prom_printf("Device tree struct 0x%x -> 0x%x\n",
1984 RELOC(dt_struct_start
), RELOC(dt_struct_end
));
1988 #ifdef CONFIG_PPC_MAPLE
1989 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property.
1990 * The values are bad, and it doesn't even have the right number of cells. */
1991 static void __init
fixup_device_tree_maple(void)
1996 isa
= call_prom("finddevice", 1, 1, ADDR("/ht@0/isa@4"));
1997 if (!PHANDLE_VALID(isa
))
2000 if (prom_getprop(isa
, "ranges", isa_ranges
, sizeof(isa_ranges
))
2004 if (isa_ranges
[0] != 0x1 ||
2005 isa_ranges
[1] != 0xf4000000 ||
2006 isa_ranges
[2] != 0x00010000)
2009 prom_printf("fixing up bogus ISA range on Maple...\n");
2011 isa_ranges
[0] = 0x1;
2012 isa_ranges
[1] = 0x0;
2013 isa_ranges
[2] = 0x01002000; /* IO space; PCI device = 4 */
2014 isa_ranges
[3] = 0x0;
2015 isa_ranges
[4] = 0x0;
2016 isa_ranges
[5] = 0x00010000;
2017 prom_setprop(isa
, "/ht@0/isa@4", "ranges",
2018 isa_ranges
, sizeof(isa_ranges
));
2021 #define fixup_device_tree_maple()
2024 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC)
2025 static void __init
fixup_device_tree_pmac(void)
2027 phandle u3
, i2c
, mpic
;
2032 /* Some G5s have a missing interrupt definition, fix it up here */
2033 u3
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000"));
2034 if (!PHANDLE_VALID(u3
))
2036 i2c
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000"));
2037 if (!PHANDLE_VALID(i2c
))
2039 mpic
= call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000"));
2040 if (!PHANDLE_VALID(mpic
))
2043 /* check if proper rev of u3 */
2044 if (prom_getprop(u3
, "device-rev", &u3_rev
, sizeof(u3_rev
))
2047 if (u3_rev
< 0x35 || u3_rev
> 0x39)
2049 /* does it need fixup ? */
2050 if (prom_getproplen(i2c
, "interrupts") > 0)
2053 prom_printf("fixing up bogus interrupts for u3 i2c...\n");
2055 /* interrupt on this revision of u3 is number 0 and level */
2058 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupts",
2059 &interrupts
, sizeof(interrupts
));
2061 prom_setprop(i2c
, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",
2062 &parent
, sizeof(parent
));
2065 #define fixup_device_tree_pmac()
2068 static void __init
fixup_device_tree(void)
2070 fixup_device_tree_maple();
2071 fixup_device_tree_pmac();
2074 static void __init
prom_find_boot_cpu(void)
2076 struct prom_t
*_prom
= &RELOC(prom
);
2082 if (prom_getprop(_prom
->chosen
, "cpu", &prom_cpu
, sizeof(prom_cpu
)) <= 0)
2085 cpu_pkg
= call_prom("instance-to-package", 1, 1, prom_cpu
);
2087 prom_getprop(cpu_pkg
, "reg", &getprop_rval
, sizeof(getprop_rval
));
2088 _prom
->cpu
= getprop_rval
;
2090 prom_debug("Booting CPU hw index = 0x%x\n", _prom
->cpu
);
2093 static void __init
prom_check_initrd(unsigned long r3
, unsigned long r4
)
2095 #ifdef CONFIG_BLK_DEV_INITRD
2096 struct prom_t
*_prom
= &RELOC(prom
);
2098 if (r3
&& r4
&& r4
!= 0xdeadbeef) {
2101 RELOC(prom_initrd_start
) = is_kernel_addr(r3
) ? __pa(r3
) : r3
;
2102 RELOC(prom_initrd_end
) = RELOC(prom_initrd_start
) + r4
;
2104 val
= RELOC(prom_initrd_start
);
2105 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-start",
2107 val
= RELOC(prom_initrd_end
);
2108 prom_setprop(_prom
->chosen
, "/chosen", "linux,initrd-end",
2111 reserve_mem(RELOC(prom_initrd_start
),
2112 RELOC(prom_initrd_end
) - RELOC(prom_initrd_start
));
2114 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start
));
2115 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end
));
2117 #endif /* CONFIG_BLK_DEV_INITRD */
2121 * We enter here early on, when the Open Firmware prom is still
2122 * handling exceptions and the MMU hash table for us.
2125 unsigned long __init
prom_init(unsigned long r3
, unsigned long r4
,
2127 unsigned long r6
, unsigned long r7
)
2129 struct prom_t
*_prom
;
2131 unsigned long offset
= reloc_offset();
2137 _prom
= &RELOC(prom
);
2140 * First zero the BSS
2142 memset(&RELOC(__bss_start
), 0, __bss_stop
- __bss_start
);
2145 * Init interface to Open Firmware, get some node references,
2148 prom_init_client_services(pp
);
2151 * See if this OF is old enough that we need to do explicit maps
2152 * and other workarounds
2157 * Init prom stdout device
2162 * Get default machine type. At this point, we do not differentiate
2163 * between pSeries SMP and pSeries LPAR
2165 RELOC(of_platform
) = prom_find_machine_type();
2167 /* Bail if this is a kdump kernel. */
2168 if (PHYSICAL_START
> 0)
2169 prom_panic("Error: You can't boot a kdump kernel from OF!\n");
2172 * Check for an initrd
2174 prom_check_initrd(r3
, r4
);
2176 #ifdef CONFIG_PPC_PSERIES
2178 * On pSeries, inform the firmware about our capabilities
2180 if (RELOC(of_platform
) == PLATFORM_PSERIES
||
2181 RELOC(of_platform
) == PLATFORM_PSERIES_LPAR
)
2182 prom_send_capabilities();
2186 * Copy the CPU hold code
2188 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2189 copy_and_flush(0, KERNELBASE
+ offset
, 0x100, 0);
2192 * Do early parsing of command line
2194 early_cmdline_parse();
2197 * Initialize memory management within prom_init
2202 * Determine which cpu is actually running right _now_
2204 prom_find_boot_cpu();
2207 * Initialize display devices
2209 prom_check_displays();
2213 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else
2214 * that uses the allocator, we need to make sure we get the top of memory
2215 * available for us here...
2217 if (RELOC(of_platform
) == PLATFORM_PSERIES
)
2218 prom_initialize_tce_table();
2222 * On non-powermacs, try to instantiate RTAS and puts all CPUs
2223 * in spin-loops. PowerMacs don't have a working RTAS and use
2224 * a different way to spin CPUs
2226 if (RELOC(of_platform
) != PLATFORM_POWERMAC
) {
2227 prom_instantiate_rtas();
2232 * Fill in some infos for use by the kernel later on
2235 if (RELOC(ppc64_iommu_off
))
2236 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-off",
2239 if (RELOC(iommu_force_on
))
2240 prom_setprop(_prom
->chosen
, "/chosen", "linux,iommu-force-on",
2243 if (RELOC(prom_tce_alloc_start
)) {
2244 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-start",
2245 &RELOC(prom_tce_alloc_start
),
2246 sizeof(prom_tce_alloc_start
));
2247 prom_setprop(_prom
->chosen
, "/chosen", "linux,tce-alloc-end",
2248 &RELOC(prom_tce_alloc_end
),
2249 sizeof(prom_tce_alloc_end
));
2254 * Fixup any known bugs in the device-tree
2256 fixup_device_tree();
2259 * Now finally create the flattened device-tree
2261 prom_printf("copying OF device tree ...\n");
2262 flatten_device_tree();
2265 * in case stdin is USB and still active on IBM machines...
2266 * Unfortunately quiesce crashes on some powermacs if we have
2267 * closed stdin already (in particular the powerbook 101).
2269 if (RELOC(of_platform
) != PLATFORM_POWERMAC
)
2273 * Call OF "quiesce" method to shut down pending DMA's from
2276 prom_printf("Calling quiesce ...\n");
2277 call_prom("quiesce", 0, 0);
2280 * And finally, call the kernel passing it the flattened device
2281 * tree and NULL as r5, thus triggering the new entry point which
2282 * is common to us and kexec
2284 hdr
= RELOC(dt_header_start
);
2285 prom_printf("returning from prom_init\n");
2286 prom_debug("->dt_header_start=0x%x\n", hdr
);
2289 reloc_got2(-offset
);
2292 __start(hdr
, KERNELBASE
+ offset
, 0);