2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1995 Linus Torvalds
7 * Copyright (C) 1995 Waldorf Electronics
8 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
9 * Copyright (C) 1996 Stoned Elipot
10 * Copyright (C) 1999 Silicon Graphics, Inc.
11 * Copyright (C) 2000 2001, 2002 Maciej W. Rozycki
13 #include <linux/config.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <linux/ioport.h>
17 #include <linux/sched.h>
18 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/stddef.h>
22 #include <linux/string.h>
23 #include <linux/unistd.h>
24 #include <linux/slab.h>
25 #include <linux/user.h>
26 #include <linux/utsname.h>
27 #include <linux/a.out.h>
28 #include <linux/tty.h>
29 #include <linux/bootmem.h>
30 #include <linux/initrd.h>
31 #include <linux/major.h>
32 #include <linux/kdev_t.h>
33 #include <linux/root_dev.h>
34 #include <linux/highmem.h>
35 #include <linux/console.h>
37 #include <asm/addrspace.h>
38 #include <asm/bootinfo.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/system.h>
44 struct cpuinfo_mips cpu_data
[NR_CPUS
];
46 EXPORT_SYMBOL(cpu_data
);
49 struct screen_info screen_info
;
53 * Despite it's name this variable is even if we don't have PCI
55 unsigned int PCI_DMA_BUS_IS_PHYS
;
57 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS
);
62 * These are initialized so they are in the .data section
64 unsigned long mips_machtype
= MACH_UNKNOWN
;
65 unsigned long mips_machgroup
= MACH_GROUP_UNKNOWN
;
67 EXPORT_SYMBOL(mips_machtype
);
68 EXPORT_SYMBOL(mips_machgroup
);
70 struct boot_mem_map boot_mem_map
;
72 static char command_line
[CL_SIZE
];
73 char arcs_cmdline
[CL_SIZE
]=CONFIG_CMDLINE
;
76 * mips_io_port_base is the begin of the address space to which x86 style
77 * I/O ports are mapped.
79 const unsigned long mips_io_port_base
= -1;
80 EXPORT_SYMBOL(mips_io_port_base
);
83 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
86 unsigned long isa_slot_offset
;
87 EXPORT_SYMBOL(isa_slot_offset
);
89 static struct resource code_resource
= { .name
= "Kernel code", };
90 static struct resource data_resource
= { .name
= "Kernel data", };
92 void __init
add_memory_region(phys_t start
, phys_t size
, long type
)
94 int x
= boot_mem_map
.nr_map
;
95 struct boot_mem_map_entry
*prev
= boot_mem_map
.map
+ x
- 1;
98 * Try to merge with previous entry if any. This is far less than
99 * perfect but is sufficient for most real world cases.
101 if (x
&& prev
->addr
+ prev
->size
== start
&& prev
->type
== type
) {
106 if (x
== BOOT_MEM_MAP_MAX
) {
107 printk("Ooops! Too many entries in the memory map!\n");
111 boot_mem_map
.map
[x
].addr
= start
;
112 boot_mem_map
.map
[x
].size
= size
;
113 boot_mem_map
.map
[x
].type
= type
;
114 boot_mem_map
.nr_map
++;
117 static void __init
print_memory_map(void)
120 const int field
= 2 * sizeof(unsigned long);
122 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
123 printk(" memory: %0*Lx @ %0*Lx ",
124 field
, (unsigned long long) boot_mem_map
.map
[i
].size
,
125 field
, (unsigned long long) boot_mem_map
.map
[i
].addr
);
127 switch (boot_mem_map
.map
[i
].type
) {
129 printk("(usable)\n");
131 case BOOT_MEM_ROM_DATA
:
132 printk("(ROM data)\n");
134 case BOOT_MEM_RESERVED
:
135 printk("(reserved)\n");
138 printk("type %lu\n", boot_mem_map
.map
[i
].type
);
144 static inline void parse_cmdline_early(void)
146 char c
= ' ', *to
= command_line
, *from
= saved_command_line
;
147 unsigned long start_at
, mem_size
;
151 printk("Determined physical RAM map:\n");
156 * "mem=XXX[kKmM]" defines a memory region from
157 * 0 to <XXX>, overriding the determined size.
158 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
159 * <YYY> to <YYY>+<XXX>, overriding the determined size.
161 if (c
== ' ' && !memcmp(from
, "mem=", 4)) {
162 if (to
!= command_line
)
165 * If a user specifies memory size, we
166 * blow away any automatically generated
170 boot_mem_map
.nr_map
= 0;
173 mem_size
= memparse(from
+ 4, &from
);
175 start_at
= memparse(from
+ 1, &from
);
178 add_memory_region(start_at
, mem_size
, BOOT_MEM_RAM
);
183 if (CL_SIZE
<= ++len
)
190 printk("User-defined physical RAM map:\n");
195 static inline int parse_rd_cmdline(unsigned long* rd_start
, unsigned long* rd_end
)
198 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
199 * "rd_size=0xNN" it's size
201 unsigned long start
= 0;
202 unsigned long size
= 0;
204 char cmd_line
[CL_SIZE
];
209 strcpy(cmd_line
, command_line
);
212 /* Ignore "rd_start=" strings in other parameters. */
213 start_str
= strstr(cmd_line
, "rd_start=");
214 if (start_str
&& start_str
!= cmd_line
&& *(start_str
- 1) != ' ')
215 start_str
= strstr(start_str
, " rd_start=");
217 if (start_str
!= cmd_line
)
218 strncat(command_line
, tmp
, start_str
- tmp
);
219 start
= memparse(start_str
+ 9, &start_str
);
221 start_str
= strstr(start_str
, " rd_start=");
224 strcat(command_line
, tmp
);
226 strcpy(cmd_line
, command_line
);
229 /* Ignore "rd_size" strings in other parameters. */
230 size_str
= strstr(cmd_line
, "rd_size=");
231 if (size_str
&& size_str
!= cmd_line
&& *(size_str
- 1) != ' ')
232 size_str
= strstr(size_str
, " rd_size=");
234 if (size_str
!= cmd_line
)
235 strncat(command_line
, tmp
, size_str
- tmp
);
236 size
= memparse(size_str
+ 8, &size_str
);
238 size_str
= strstr(size_str
, " rd_size=");
241 strcat(command_line
, tmp
);
244 /* HACK: Guess if the sign extension was forgotten */
245 if (start
> 0x0000000080000000 && start
< 0x00000000ffffffff)
246 start
|= 0xffffffff00000000;
258 #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
259 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
260 #define PFN_PHYS(x) ((x) << PAGE_SHIFT)
262 #define MAXMEM HIGHMEM_START
263 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
265 static inline void bootmem_init(void)
267 unsigned long start_pfn
;
268 unsigned long reserved_end
= (unsigned long)&_end
;
269 #ifndef CONFIG_SGI_IP27
270 unsigned long first_usable_pfn
;
271 unsigned long bootmap_size
;
274 #ifdef CONFIG_BLK_DEV_INITRD
275 int initrd_reserve_bootmem
= 0;
277 /* Board specific code should have set up initrd_start and initrd_end */
278 ROOT_DEV
= Root_RAM0
;
279 if (parse_rd_cmdline(&initrd_start
, &initrd_end
)) {
280 reserved_end
= max(reserved_end
, initrd_end
);
281 initrd_reserve_bootmem
= 1;
286 tmp
= ((reserved_end
+ PAGE_SIZE
-1) & PAGE_MASK
) - sizeof(u32
) * 2;
287 if (tmp
< reserved_end
)
289 initrd_header
= (u32
*)tmp
;
290 if (initrd_header
[0] == 0x494E5244) {
291 initrd_start
= (unsigned long)&initrd_header
[2];
292 initrd_end
= initrd_start
+ initrd_header
[1];
293 reserved_end
= max(reserved_end
, initrd_end
);
294 initrd_reserve_bootmem
= 1;
297 #endif /* CONFIG_BLK_DEV_INITRD */
300 * Partially used pages are not usable - thus
301 * we are rounding upwards.
303 start_pfn
= PFN_UP(CPHYSADDR(reserved_end
));
305 #ifndef CONFIG_SGI_IP27
306 /* Find the highest page frame number we have available. */
308 first_usable_pfn
= -1UL;
309 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
310 unsigned long start
, end
;
312 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
315 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
316 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
317 + boot_mem_map
.map
[i
].size
);
323 if (start
< first_usable_pfn
) {
324 if (start
> start_pfn
) {
325 first_usable_pfn
= start
;
326 } else if (end
> start_pfn
) {
327 first_usable_pfn
= start_pfn
;
333 * Determine low and high memory ranges
335 max_low_pfn
= max_pfn
;
336 if (max_low_pfn
> MAXMEM_PFN
) {
337 max_low_pfn
= MAXMEM_PFN
;
338 #ifndef CONFIG_HIGHMEM
339 /* Maximum memory usable is what is directly addressable */
340 printk(KERN_WARNING
"Warning only %ldMB will be used.\n",
342 printk(KERN_WARNING
"Use a HIGHMEM enabled kernel.\n");
346 #ifdef CONFIG_HIGHMEM
348 * Crude, we really should make a better attempt at detecting
351 highstart_pfn
= highend_pfn
= max_pfn
;
352 if (max_pfn
> MAXMEM_PFN
) {
353 highstart_pfn
= MAXMEM_PFN
;
354 printk(KERN_NOTICE
"%ldMB HIGHMEM available.\n",
355 (highend_pfn
- highstart_pfn
) >> (20 - PAGE_SHIFT
));
359 /* Initialize the boot-time allocator with low memory only. */
360 bootmap_size
= init_bootmem(first_usable_pfn
, max_low_pfn
);
363 * Register fully available low RAM pages with the bootmem allocator.
365 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
366 unsigned long curr_pfn
, last_pfn
, size
;
369 * Reserve usable memory.
371 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
375 * We are rounding up the start address of usable memory:
377 curr_pfn
= PFN_UP(boot_mem_map
.map
[i
].addr
);
378 if (curr_pfn
>= max_low_pfn
)
380 if (curr_pfn
< start_pfn
)
381 curr_pfn
= start_pfn
;
384 * ... and at the end of the usable range downwards:
386 last_pfn
= PFN_DOWN(boot_mem_map
.map
[i
].addr
387 + boot_mem_map
.map
[i
].size
);
389 if (last_pfn
> max_low_pfn
)
390 last_pfn
= max_low_pfn
;
393 * Only register lowmem part of lowmem segment with bootmem.
395 size
= last_pfn
- curr_pfn
;
396 if (curr_pfn
> PFN_DOWN(HIGHMEM_START
))
398 if (curr_pfn
+ size
- 1 > PFN_DOWN(HIGHMEM_START
))
399 size
= PFN_DOWN(HIGHMEM_START
) - curr_pfn
;
404 * ... finally, did all the rounding and playing
405 * around just make the area go away?
407 if (last_pfn
<= curr_pfn
)
410 /* Register lowmem ranges */
411 free_bootmem(PFN_PHYS(curr_pfn
), PFN_PHYS(size
));
414 /* Reserve the bootmap memory. */
415 reserve_bootmem(PFN_PHYS(first_usable_pfn
), bootmap_size
);
416 #endif /* CONFIG_SGI_IP27 */
418 #ifdef CONFIG_BLK_DEV_INITRD
419 initrd_below_start_ok
= 1;
421 unsigned long initrd_size
= ((unsigned char *)initrd_end
) - ((unsigned char *)initrd_start
);
422 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
423 (void *)initrd_start
, initrd_size
);
425 if (CPHYSADDR(initrd_end
) > PFN_PHYS(max_low_pfn
)) {
426 printk("initrd extends beyond end of memory "
427 "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
429 (unsigned long long)CPHYSADDR(initrd_end
),
431 (unsigned long long)PFN_PHYS(max_low_pfn
));
432 initrd_start
= initrd_end
= 0;
433 initrd_reserve_bootmem
= 0;
436 if (initrd_reserve_bootmem
)
437 reserve_bootmem(CPHYSADDR(initrd_start
), initrd_size
);
439 #endif /* CONFIG_BLK_DEV_INITRD */
442 static inline void resource_init(void)
446 #if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
448 * The 64bit code in 32bit object format trick can't represent
449 * 64bit wide relocations for linker script symbols.
451 code_resource
.start
= CPHYSADDR(&_text
);
452 code_resource
.end
= CPHYSADDR(&_etext
) - 1;
453 data_resource
.start
= CPHYSADDR(&_etext
);
454 data_resource
.end
= CPHYSADDR(&_edata
) - 1;
456 code_resource
.start
= virt_to_phys(&_text
);
457 code_resource
.end
= virt_to_phys(&_etext
) - 1;
458 data_resource
.start
= virt_to_phys(&_etext
);
459 data_resource
.end
= virt_to_phys(&_edata
) - 1;
463 * Request address space for all standard RAM.
465 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
466 struct resource
*res
;
467 unsigned long start
, end
;
469 start
= boot_mem_map
.map
[i
].addr
;
470 end
= boot_mem_map
.map
[i
].addr
+ boot_mem_map
.map
[i
].size
- 1;
476 res
= alloc_bootmem(sizeof(struct resource
));
477 switch (boot_mem_map
.map
[i
].type
) {
479 case BOOT_MEM_ROM_DATA
:
480 res
->name
= "System RAM";
482 case BOOT_MEM_RESERVED
:
484 res
->name
= "reserved";
490 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
491 request_resource(&iomem_resource
, res
);
494 * We don't know which RAM region contains kernel data,
495 * so we try it repeatedly and let the resource manager
498 request_resource(res
, &code_resource
);
499 request_resource(res
, &data_resource
);
510 static int __initdata earlyinit_debug
;
512 static int __init
earlyinit_debug_setup(char *str
)
517 __setup("earlyinit_debug", earlyinit_debug_setup
);
519 extern initcall_t __earlyinitcall_start
, __earlyinitcall_end
;
521 static void __init
do_earlyinitcalls(void)
523 initcall_t
*call
, *start
, *end
;
525 start
= &__earlyinitcall_start
;
526 end
= &__earlyinitcall_end
;
528 for (call
= start
; call
< end
; call
++) {
530 printk("calling earlyinitcall 0x%p\n", *call
);
536 void __init
setup_arch(char **cmdline_p
)
542 #if defined(CONFIG_VT)
543 #if defined(CONFIG_VGA_CONSOLE)
544 conswitchp
= &vga_con
;
545 #elif defined(CONFIG_DUMMY_CONSOLE)
546 conswitchp
= &dummy_con
;
550 /* call board setup routine */
553 strlcpy(command_line
, arcs_cmdline
, sizeof(command_line
));
554 strlcpy(saved_command_line
, command_line
, COMMAND_LINE_SIZE
);
556 *cmdline_p
= command_line
;
558 parse_cmdline_early();
564 int __init
fpu_disable(char *s
)
566 cpu_data
[0].options
&= ~MIPS_CPU_FPU
;
571 __setup("nofpu", fpu_disable
);