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>
36 #include <linux/mmzone.h>
38 #include <asm/addrspace.h>
39 #include <asm/bootinfo.h>
41 #include <asm/sections.h>
42 #include <asm/setup.h>
43 #include <asm/system.h>
45 struct cpuinfo_mips cpu_data
[NR_CPUS
];
47 EXPORT_SYMBOL(cpu_data
);
50 struct screen_info screen_info
;
54 * Despite it's name this variable is even if we don't have PCI
56 unsigned int PCI_DMA_BUS_IS_PHYS
;
58 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS
);
63 * These are initialized so they are in the .data section
65 unsigned long mips_machtype
= MACH_UNKNOWN
;
66 unsigned long mips_machgroup
= MACH_GROUP_UNKNOWN
;
68 EXPORT_SYMBOL(mips_machtype
);
69 EXPORT_SYMBOL(mips_machgroup
);
71 struct boot_mem_map boot_mem_map
;
73 static char command_line
[CL_SIZE
];
74 char arcs_cmdline
[CL_SIZE
]=CONFIG_CMDLINE
;
77 * mips_io_port_base is the begin of the address space to which x86 style
78 * I/O ports are mapped.
80 const unsigned long mips_io_port_base
= -1;
81 EXPORT_SYMBOL(mips_io_port_base
);
84 * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
87 unsigned long isa_slot_offset
;
88 EXPORT_SYMBOL(isa_slot_offset
);
90 static struct resource code_resource
= { .name
= "Kernel code", };
91 static struct resource data_resource
= { .name
= "Kernel data", };
93 void __init
add_memory_region(phys_t start
, phys_t size
, long type
)
95 int x
= boot_mem_map
.nr_map
;
96 struct boot_mem_map_entry
*prev
= boot_mem_map
.map
+ x
- 1;
99 * Try to merge with previous entry if any. This is far less than
100 * perfect but is sufficient for most real world cases.
102 if (x
&& prev
->addr
+ prev
->size
== start
&& prev
->type
== type
) {
107 if (x
== BOOT_MEM_MAP_MAX
) {
108 printk("Ooops! Too many entries in the memory map!\n");
112 boot_mem_map
.map
[x
].addr
= start
;
113 boot_mem_map
.map
[x
].size
= size
;
114 boot_mem_map
.map
[x
].type
= type
;
115 boot_mem_map
.nr_map
++;
118 static void __init
print_memory_map(void)
121 const int field
= 2 * sizeof(unsigned long);
123 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
124 printk(" memory: %0*Lx @ %0*Lx ",
125 field
, (unsigned long long) boot_mem_map
.map
[i
].size
,
126 field
, (unsigned long long) boot_mem_map
.map
[i
].addr
);
128 switch (boot_mem_map
.map
[i
].type
) {
130 printk("(usable)\n");
132 case BOOT_MEM_ROM_DATA
:
133 printk("(ROM data)\n");
135 case BOOT_MEM_RESERVED
:
136 printk("(reserved)\n");
139 printk("type %lu\n", boot_mem_map
.map
[i
].type
);
145 static inline void parse_cmdline_early(void)
147 char c
= ' ', *to
= command_line
, *from
= saved_command_line
;
148 unsigned long start_at
, mem_size
;
152 printk("Determined physical RAM map:\n");
157 * "mem=XXX[kKmM]" defines a memory region from
158 * 0 to <XXX>, overriding the determined size.
159 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
160 * <YYY> to <YYY>+<XXX>, overriding the determined size.
162 if (c
== ' ' && !memcmp(from
, "mem=", 4)) {
163 if (to
!= command_line
)
166 * If a user specifies memory size, we
167 * blow away any automatically generated
171 boot_mem_map
.nr_map
= 0;
174 mem_size
= memparse(from
+ 4, &from
);
176 start_at
= memparse(from
+ 1, &from
);
179 add_memory_region(start_at
, mem_size
, BOOT_MEM_RAM
);
184 if (CL_SIZE
<= ++len
)
191 printk("User-defined physical RAM map:\n");
196 static inline int parse_rd_cmdline(unsigned long* rd_start
, unsigned long* rd_end
)
199 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
200 * "rd_size=0xNN" it's size
202 unsigned long start
= 0;
203 unsigned long size
= 0;
205 char cmd_line
[CL_SIZE
];
210 strcpy(cmd_line
, command_line
);
213 /* Ignore "rd_start=" strings in other parameters. */
214 start_str
= strstr(cmd_line
, "rd_start=");
215 if (start_str
&& start_str
!= cmd_line
&& *(start_str
- 1) != ' ')
216 start_str
= strstr(start_str
, " rd_start=");
218 if (start_str
!= cmd_line
)
219 strncat(command_line
, tmp
, start_str
- tmp
);
220 start
= memparse(start_str
+ 9, &start_str
);
222 start_str
= strstr(start_str
, " rd_start=");
225 strcat(command_line
, tmp
);
227 strcpy(cmd_line
, command_line
);
230 /* Ignore "rd_size" strings in other parameters. */
231 size_str
= strstr(cmd_line
, "rd_size=");
232 if (size_str
&& size_str
!= cmd_line
&& *(size_str
- 1) != ' ')
233 size_str
= strstr(size_str
, " rd_size=");
235 if (size_str
!= cmd_line
)
236 strncat(command_line
, tmp
, size_str
- tmp
);
237 size
= memparse(size_str
+ 8, &size_str
);
239 size_str
= strstr(size_str
, " rd_size=");
242 strcat(command_line
, tmp
);
245 /* HACK: Guess if the sign extension was forgotten */
246 if (start
> 0x0000000080000000 && start
< 0x00000000ffffffff)
247 start
|= 0xffffffff00000000;
259 #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
260 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
261 #define PFN_PHYS(x) ((x) << PAGE_SHIFT)
263 #define MAXMEM HIGHMEM_START
264 #define MAXMEM_PFN PFN_DOWN(MAXMEM)
266 static inline void bootmem_init(void)
268 unsigned long start_pfn
;
269 unsigned long reserved_end
= (unsigned long)&_end
;
270 #ifndef CONFIG_SGI_IP27
271 unsigned long first_usable_pfn
;
272 unsigned long bootmap_size
;
275 #ifdef CONFIG_BLK_DEV_INITRD
276 int initrd_reserve_bootmem
= 0;
278 /* Board specific code should have set up initrd_start and initrd_end */
279 ROOT_DEV
= Root_RAM0
;
280 if (parse_rd_cmdline(&initrd_start
, &initrd_end
)) {
281 reserved_end
= max(reserved_end
, initrd_end
);
282 initrd_reserve_bootmem
= 1;
287 tmp
= ((reserved_end
+ PAGE_SIZE
-1) & PAGE_MASK
) - sizeof(u32
) * 2;
288 if (tmp
< reserved_end
)
290 initrd_header
= (u32
*)tmp
;
291 if (initrd_header
[0] == 0x494E5244) {
292 initrd_start
= (unsigned long)&initrd_header
[2];
293 initrd_end
= initrd_start
+ initrd_header
[1];
294 reserved_end
= max(reserved_end
, initrd_end
);
295 initrd_reserve_bootmem
= 1;
298 #endif /* CONFIG_BLK_DEV_INITRD */
301 * Partially used pages are not usable - thus
302 * we are rounding upwards.
304 start_pfn
= PFN_UP(CPHYSADDR(reserved_end
));
306 #ifndef CONFIG_SGI_IP27
307 /* Find the highest page frame number we have available. */
309 first_usable_pfn
= -1UL;
310 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
311 unsigned long start
, end
;
313 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
316 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
317 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
318 + boot_mem_map
.map
[i
].size
);
324 if (start
< first_usable_pfn
) {
325 if (start
> start_pfn
) {
326 first_usable_pfn
= start
;
327 } else if (end
> start_pfn
) {
328 first_usable_pfn
= start_pfn
;
334 * Determine low and high memory ranges
336 max_low_pfn
= max_pfn
;
337 if (max_low_pfn
> MAXMEM_PFN
) {
338 max_low_pfn
= MAXMEM_PFN
;
339 #ifndef CONFIG_HIGHMEM
340 /* Maximum memory usable is what is directly addressable */
341 printk(KERN_WARNING
"Warning only %ldMB will be used.\n",
343 printk(KERN_WARNING
"Use a HIGHMEM enabled kernel.\n");
347 #ifdef CONFIG_HIGHMEM
349 * Crude, we really should make a better attempt at detecting
352 highstart_pfn
= highend_pfn
= max_pfn
;
353 if (max_pfn
> MAXMEM_PFN
) {
354 highstart_pfn
= MAXMEM_PFN
;
355 printk(KERN_NOTICE
"%ldMB HIGHMEM available.\n",
356 (highend_pfn
- highstart_pfn
) >> (20 - PAGE_SHIFT
));
360 memory_present(0, first_usable_pfn
, max_low_pfn
);
362 /* Initialize the boot-time allocator with low memory only. */
363 bootmap_size
= init_bootmem(first_usable_pfn
, max_low_pfn
);
366 * Register fully available low RAM pages with the bootmem allocator.
368 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
369 unsigned long curr_pfn
, last_pfn
, size
;
372 * Reserve usable memory.
374 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
378 * We are rounding up the start address of usable memory:
380 curr_pfn
= PFN_UP(boot_mem_map
.map
[i
].addr
);
381 if (curr_pfn
>= max_low_pfn
)
383 if (curr_pfn
< start_pfn
)
384 curr_pfn
= start_pfn
;
387 * ... and at the end of the usable range downwards:
389 last_pfn
= PFN_DOWN(boot_mem_map
.map
[i
].addr
390 + boot_mem_map
.map
[i
].size
);
392 if (last_pfn
> max_low_pfn
)
393 last_pfn
= max_low_pfn
;
396 * Only register lowmem part of lowmem segment with bootmem.
398 size
= last_pfn
- curr_pfn
;
399 if (curr_pfn
> PFN_DOWN(HIGHMEM_START
))
401 if (curr_pfn
+ size
- 1 > PFN_DOWN(HIGHMEM_START
))
402 size
= PFN_DOWN(HIGHMEM_START
) - curr_pfn
;
407 * ... finally, did all the rounding and playing
408 * around just make the area go away?
410 if (last_pfn
<= curr_pfn
)
413 /* Register lowmem ranges */
414 free_bootmem(PFN_PHYS(curr_pfn
), PFN_PHYS(size
));
417 /* Reserve the bootmap memory. */
418 reserve_bootmem(PFN_PHYS(first_usable_pfn
), bootmap_size
);
419 #endif /* CONFIG_SGI_IP27 */
421 #ifdef CONFIG_BLK_DEV_INITRD
422 initrd_below_start_ok
= 1;
424 unsigned long initrd_size
= ((unsigned char *)initrd_end
) - ((unsigned char *)initrd_start
);
425 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
426 (void *)initrd_start
, initrd_size
);
428 if (CPHYSADDR(initrd_end
) > PFN_PHYS(max_low_pfn
)) {
429 printk("initrd extends beyond end of memory "
430 "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
432 (unsigned long long)CPHYSADDR(initrd_end
),
434 (unsigned long long)PFN_PHYS(max_low_pfn
));
435 initrd_start
= initrd_end
= 0;
436 initrd_reserve_bootmem
= 0;
439 if (initrd_reserve_bootmem
)
440 reserve_bootmem(CPHYSADDR(initrd_start
), initrd_size
);
442 #endif /* CONFIG_BLK_DEV_INITRD */
445 static inline void resource_init(void)
449 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
451 * The 64bit code in 32bit object format trick can't represent
452 * 64bit wide relocations for linker script symbols.
454 code_resource
.start
= CPHYSADDR(&_text
);
455 code_resource
.end
= CPHYSADDR(&_etext
) - 1;
456 data_resource
.start
= CPHYSADDR(&_etext
);
457 data_resource
.end
= CPHYSADDR(&_edata
) - 1;
459 code_resource
.start
= virt_to_phys(&_text
);
460 code_resource
.end
= virt_to_phys(&_etext
) - 1;
461 data_resource
.start
= virt_to_phys(&_etext
);
462 data_resource
.end
= virt_to_phys(&_edata
) - 1;
466 * Request address space for all standard RAM.
468 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
469 struct resource
*res
;
470 unsigned long start
, end
;
472 start
= boot_mem_map
.map
[i
].addr
;
473 end
= boot_mem_map
.map
[i
].addr
+ boot_mem_map
.map
[i
].size
- 1;
479 res
= alloc_bootmem(sizeof(struct resource
));
480 switch (boot_mem_map
.map
[i
].type
) {
482 case BOOT_MEM_ROM_DATA
:
483 res
->name
= "System RAM";
485 case BOOT_MEM_RESERVED
:
487 res
->name
= "reserved";
493 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
494 request_resource(&iomem_resource
, res
);
497 * We don't know which RAM region contains kernel data,
498 * so we try it repeatedly and let the resource manager
501 request_resource(res
, &code_resource
);
502 request_resource(res
, &data_resource
);
513 static int __initdata earlyinit_debug
;
515 static int __init
earlyinit_debug_setup(char *str
)
520 __setup("earlyinit_debug", earlyinit_debug_setup
);
522 extern initcall_t __earlyinitcall_start
, __earlyinitcall_end
;
524 static void __init
do_earlyinitcalls(void)
526 initcall_t
*call
, *start
, *end
;
528 start
= &__earlyinitcall_start
;
529 end
= &__earlyinitcall_end
;
531 for (call
= start
; call
< end
; call
++) {
533 printk("calling earlyinitcall 0x%p\n", *call
);
539 void __init
setup_arch(char **cmdline_p
)
545 #if defined(CONFIG_VT)
546 #if defined(CONFIG_VGA_CONSOLE)
547 conswitchp
= &vga_con
;
548 #elif defined(CONFIG_DUMMY_CONSOLE)
549 conswitchp
= &dummy_con
;
553 /* call board setup routine */
556 strlcpy(command_line
, arcs_cmdline
, sizeof(command_line
));
557 strlcpy(saved_command_line
, command_line
, COMMAND_LINE_SIZE
);
559 *cmdline_p
= command_line
;
561 parse_cmdline_early();
568 int __init
fpu_disable(char *s
)
570 cpu_data
[0].options
&= ~MIPS_CPU_FPU
;
575 __setup("nofpu", fpu_disable
);