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, 2007 Maciej W. Rozycki
13 #include <linux/init.h>
14 #include <linux/ioport.h>
15 #include <linux/export.h>
16 #include <linux/screen_info.h>
17 #include <linux/memblock.h>
18 #include <linux/bootmem.h>
19 #include <linux/initrd.h>
20 #include <linux/root_dev.h>
21 #include <linux/highmem.h>
22 #include <linux/console.h>
23 #include <linux/pfn.h>
24 #include <linux/debugfs.h>
25 #include <linux/kexec.h>
26 #include <linux/sizes.h>
27 #include <linux/device.h>
28 #include <linux/dma-contiguous.h>
30 #include <asm/addrspace.h>
31 #include <asm/bootinfo.h>
33 #include <asm/cache.h>
36 #include <asm/sections.h>
37 #include <asm/setup.h>
38 #include <asm/smp-ops.h>
41 struct cpuinfo_mips cpu_data
[NR_CPUS
] __read_mostly
;
43 EXPORT_SYMBOL(cpu_data
);
46 struct screen_info screen_info
;
50 * Despite it's name this variable is even if we don't have PCI
52 unsigned int PCI_DMA_BUS_IS_PHYS
;
54 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS
);
59 * These are initialized so they are in the .data section
61 unsigned long mips_machtype __read_mostly
= MACH_UNKNOWN
;
63 EXPORT_SYMBOL(mips_machtype
);
65 struct boot_mem_map boot_mem_map
;
67 static char __initdata command_line
[COMMAND_LINE_SIZE
];
68 char __initdata arcs_cmdline
[COMMAND_LINE_SIZE
];
70 #ifdef CONFIG_CMDLINE_BOOL
71 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
75 * mips_io_port_base is the begin of the address space to which x86 style
76 * I/O ports are mapped.
78 const unsigned long mips_io_port_base
= -1;
79 EXPORT_SYMBOL(mips_io_port_base
);
81 static struct resource code_resource
= { .name
= "Kernel code", };
82 static struct resource data_resource
= { .name
= "Kernel data", };
84 static void *detect_magic __initdata
= detect_memory_region
;
86 void __init
add_memory_region(phys_addr_t start
, phys_addr_t size
, long type
)
88 int x
= boot_mem_map
.nr_map
;
92 if (start
+ size
< start
) {
93 pr_warn("Trying to add an invalid memory region, skipped\n");
98 * Try to merge with existing entry, if any.
100 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
101 struct boot_mem_map_entry
*entry
= boot_mem_map
.map
+ i
;
104 if (entry
->type
!= type
)
107 if (start
+ size
< entry
->addr
)
108 continue; /* no overlap */
110 if (entry
->addr
+ entry
->size
< start
)
111 continue; /* no overlap */
113 top
= max(entry
->addr
+ entry
->size
, start
+ size
);
114 entry
->addr
= min(entry
->addr
, start
);
115 entry
->size
= top
- entry
->addr
;
120 if (boot_mem_map
.nr_map
== BOOT_MEM_MAP_MAX
) {
121 pr_err("Ooops! Too many entries in the memory map!\n");
125 boot_mem_map
.map
[x
].addr
= start
;
126 boot_mem_map
.map
[x
].size
= size
;
127 boot_mem_map
.map
[x
].type
= type
;
128 boot_mem_map
.nr_map
++;
131 void __init
detect_memory_region(phys_addr_t start
, phys_addr_t sz_min
, phys_addr_t sz_max
)
133 void *dm
= &detect_magic
;
136 for (size
= sz_min
; size
< sz_max
; size
<<= 1) {
137 if (!memcmp(dm
, dm
+ size
, sizeof(detect_magic
)))
141 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
142 ((unsigned long long) size
) / SZ_1M
,
143 (unsigned long long) start
,
144 ((unsigned long long) sz_min
) / SZ_1M
,
145 ((unsigned long long) sz_max
) / SZ_1M
);
147 add_memory_region(start
, size
, BOOT_MEM_RAM
);
150 static void __init
print_memory_map(void)
153 const int field
= 2 * sizeof(unsigned long);
155 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
156 printk(KERN_INFO
" memory: %0*Lx @ %0*Lx ",
157 field
, (unsigned long long) boot_mem_map
.map
[i
].size
,
158 field
, (unsigned long long) boot_mem_map
.map
[i
].addr
);
160 switch (boot_mem_map
.map
[i
].type
) {
162 printk(KERN_CONT
"(usable)\n");
164 case BOOT_MEM_INIT_RAM
:
165 printk(KERN_CONT
"(usable after init)\n");
167 case BOOT_MEM_ROM_DATA
:
168 printk(KERN_CONT
"(ROM data)\n");
170 case BOOT_MEM_RESERVED
:
171 printk(KERN_CONT
"(reserved)\n");
174 printk(KERN_CONT
"type %lu\n", boot_mem_map
.map
[i
].type
);
183 #ifdef CONFIG_BLK_DEV_INITRD
185 static int __init
rd_start_early(char *p
)
187 unsigned long start
= memparse(p
, &p
);
190 /* Guess if the sign extension was forgotten by bootloader */
194 initrd_start
= start
;
198 early_param("rd_start", rd_start_early
);
200 static int __init
rd_size_early(char *p
)
202 initrd_end
+= memparse(p
, &p
);
205 early_param("rd_size", rd_size_early
);
207 /* it returns the next free pfn after initrd */
208 static unsigned long __init
init_initrd(void)
213 * Board specific code or command line parser should have
214 * already set up initrd_start and initrd_end. In these cases
215 * perfom sanity checks and use them if all looks good.
217 if (!initrd_start
|| initrd_end
<= initrd_start
)
220 if (initrd_start
& ~PAGE_MASK
) {
221 pr_err("initrd start must be page aligned\n");
224 if (initrd_start
< PAGE_OFFSET
) {
225 pr_err("initrd start < PAGE_OFFSET\n");
230 * Sanitize initrd addresses. For example firmware
231 * can't guess if they need to pass them through
232 * 64-bits values if the kernel has been built in pure
233 * 32-bit. We need also to switch from KSEG0 to XKPHYS
234 * addresses now, so the code can now safely use __pa().
236 end
= __pa(initrd_end
);
237 initrd_end
= (unsigned long)__va(end
);
238 initrd_start
= (unsigned long)__va(__pa(initrd_start
));
240 ROOT_DEV
= Root_RAM0
;
248 static void __init
finalize_initrd(void)
250 unsigned long size
= initrd_end
- initrd_start
;
253 printk(KERN_INFO
"Initrd not found or empty");
256 if (__pa(initrd_end
) > PFN_PHYS(max_low_pfn
)) {
257 printk(KERN_ERR
"Initrd extends beyond end of memory");
261 reserve_bootmem(__pa(initrd_start
), size
, BOOTMEM_DEFAULT
);
262 initrd_below_start_ok
= 1;
264 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
268 printk(KERN_CONT
" - disabling initrd\n");
273 #else /* !CONFIG_BLK_DEV_INITRD */
275 static unsigned long __init
init_initrd(void)
280 #define finalize_initrd() do {} while (0)
285 * Initialize the bootmem allocator. It also setup initrd related data
288 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
290 static void __init
bootmem_init(void)
296 #else /* !CONFIG_SGI_IP27 */
298 static void __init
bootmem_init(void)
300 unsigned long reserved_end
;
301 unsigned long mapstart
= ~0UL;
302 unsigned long bootmap_size
;
306 * Sanity check any INITRD first. We don't take it into account
307 * for bootmem setup initially, rely on the end-of-kernel-code
308 * as our memory range starting point. Once bootmem is inited we
309 * will reserve the area used for the initrd.
312 reserved_end
= (unsigned long) PFN_UP(__pa_symbol(&_end
));
315 * max_low_pfn is not a number of pages. The number of pages
316 * of the system is given by 'max_low_pfn - min_low_pfn'.
322 * Find the highest page frame number we have available.
324 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
325 unsigned long start
, end
;
327 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
330 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
331 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
332 + boot_mem_map
.map
[i
].size
);
334 if (end
> max_low_pfn
)
336 if (start
< min_low_pfn
)
338 if (end
<= reserved_end
)
340 #ifdef CONFIG_BLK_DEV_INITRD
341 /* mapstart should be after initrd_end */
342 if (initrd_end
&& end
<= (unsigned long)PFN_UP(__pa(initrd_end
)))
345 if (start
>= mapstart
)
347 mapstart
= max(reserved_end
, start
);
350 if (min_low_pfn
>= max_low_pfn
)
351 panic("Incorrect memory mapping !!!");
352 if (min_low_pfn
> ARCH_PFN_OFFSET
) {
353 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
354 (min_low_pfn
- ARCH_PFN_OFFSET
) * sizeof(struct page
),
355 min_low_pfn
- ARCH_PFN_OFFSET
);
356 } else if (min_low_pfn
< ARCH_PFN_OFFSET
) {
357 pr_info("%lu free pages won't be used\n",
358 ARCH_PFN_OFFSET
- min_low_pfn
);
360 min_low_pfn
= ARCH_PFN_OFFSET
;
363 * Determine low and high memory ranges
365 max_pfn
= max_low_pfn
;
366 if (max_low_pfn
> PFN_DOWN(HIGHMEM_START
)) {
367 #ifdef CONFIG_HIGHMEM
368 highstart_pfn
= PFN_DOWN(HIGHMEM_START
);
369 highend_pfn
= max_low_pfn
;
371 max_low_pfn
= PFN_DOWN(HIGHMEM_START
);
375 * Initialize the boot-time allocator with low memory only.
377 bootmap_size
= init_bootmem_node(NODE_DATA(0), mapstart
,
378 min_low_pfn
, max_low_pfn
);
381 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
382 unsigned long start
, end
;
384 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
385 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
386 + boot_mem_map
.map
[i
].size
);
388 if (start
<= min_low_pfn
)
393 #ifndef CONFIG_HIGHMEM
394 if (end
> max_low_pfn
)
398 * ... finally, is the area going away?
404 memblock_add_node(PFN_PHYS(start
), PFN_PHYS(end
- start
), 0);
408 * Register fully available low RAM pages with the bootmem allocator.
410 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
411 unsigned long start
, end
, size
;
413 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
414 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
415 + boot_mem_map
.map
[i
].size
);
418 * Reserve usable memory.
420 switch (boot_mem_map
.map
[i
].type
) {
423 case BOOT_MEM_INIT_RAM
:
424 memory_present(0, start
, end
);
427 /* Not usable memory */
432 * We are rounding up the start address of usable memory
433 * and at the end of the usable range downwards.
435 if (start
>= max_low_pfn
)
437 if (start
< reserved_end
)
438 start
= reserved_end
;
439 if (end
> max_low_pfn
)
443 * ... finally, is the area going away?
449 /* Register lowmem ranges */
450 free_bootmem(PFN_PHYS(start
), size
<< PAGE_SHIFT
);
451 memory_present(0, start
, end
);
455 * Reserve the bootmap memory.
457 reserve_bootmem(PFN_PHYS(mapstart
), bootmap_size
, BOOTMEM_DEFAULT
);
460 * Reserve initrd memory if needed.
465 #endif /* CONFIG_SGI_IP27 */
468 * arch_mem_init - initialize memory management subsystem
470 * o plat_mem_setup() detects the memory configuration and will record detected
471 * memory areas using add_memory_region.
473 * At this stage the memory configuration of the system is known to the
474 * kernel but generic memory management system is still entirely uninitialized.
479 * o dma_contiguous_reserve()
481 * At this stage the bootmem allocator is ready to use.
483 * NOTE: historically plat_mem_setup did the entire platform initialization.
484 * This was rather impractical because it meant plat_mem_setup had to
485 * get away without any kind of memory allocator. To keep old code from
486 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
487 * initialization hook for anything else was introduced.
490 static int usermem __initdata
;
492 static int __init
early_parse_mem(char *p
)
494 phys_addr_t start
, size
;
497 * If a user specifies memory size, we
498 * blow away any automatically generated
502 boot_mem_map
.nr_map
= 0;
506 size
= memparse(p
, &p
);
508 start
= memparse(p
+ 1, &p
);
510 add_memory_region(start
, size
, BOOT_MEM_RAM
);
513 early_param("mem", early_parse_mem
);
515 #ifdef CONFIG_PROC_VMCORE
516 unsigned long setup_elfcorehdr
, setup_elfcorehdr_size
;
517 static int __init
early_parse_elfcorehdr(char *p
)
521 setup_elfcorehdr
= memparse(p
, &p
);
523 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
524 unsigned long start
= boot_mem_map
.map
[i
].addr
;
525 unsigned long end
= (boot_mem_map
.map
[i
].addr
+
526 boot_mem_map
.map
[i
].size
);
527 if (setup_elfcorehdr
>= start
&& setup_elfcorehdr
< end
) {
529 * Reserve from the elf core header to the end of
530 * the memory segment, that should all be kdump
533 setup_elfcorehdr_size
= end
- setup_elfcorehdr
;
538 * If we don't find it in the memory map, then we shouldn't
539 * have to worry about it, as the new kernel won't use it.
543 early_param("elfcorehdr", early_parse_elfcorehdr
);
546 static void __init
arch_mem_addpart(phys_addr_t mem
, phys_addr_t end
, int type
)
555 /* Make sure it is in the boot_mem_map */
556 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
557 if (mem
>= boot_mem_map
.map
[i
].addr
&&
558 mem
< (boot_mem_map
.map
[i
].addr
+
559 boot_mem_map
.map
[i
].size
))
562 add_memory_region(mem
, size
, type
);
566 static inline unsigned long long get_total_mem(void)
568 unsigned long long total
;
570 total
= max_pfn
- min_low_pfn
;
571 return total
<< PAGE_SHIFT
;
574 static void __init
mips_parse_crashkernel(void)
576 unsigned long long total_mem
;
577 unsigned long long crash_size
, crash_base
;
580 total_mem
= get_total_mem();
581 ret
= parse_crashkernel(boot_command_line
, total_mem
,
582 &crash_size
, &crash_base
);
583 if (ret
!= 0 || crash_size
<= 0)
586 crashk_res
.start
= crash_base
;
587 crashk_res
.end
= crash_base
+ crash_size
- 1;
590 static void __init
request_crashkernel(struct resource
*res
)
594 ret
= request_resource(res
, &crashk_res
);
596 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
597 (unsigned long)((crashk_res
.end
-
598 crashk_res
.start
+ 1) >> 20),
599 (unsigned long)(crashk_res
.start
>> 20));
601 #else /* !defined(CONFIG_KEXEC) */
602 static void __init
mips_parse_crashkernel(void)
606 static void __init
request_crashkernel(struct resource
*res
)
609 #endif /* !defined(CONFIG_KEXEC) */
611 static void __init
arch_mem_init(char **cmdline_p
)
613 struct memblock_region
*reg
;
614 extern void plat_mem_setup(void);
616 /* call board setup routine */
620 * Make sure all kernel memory is in the maps. The "UP" and
621 * "DOWN" are opposite for initdata since if it crosses over
622 * into another memory section you don't want that to be
623 * freed when the initdata is freed.
625 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text
)) << PAGE_SHIFT
,
626 PFN_UP(__pa_symbol(&_edata
)) << PAGE_SHIFT
,
628 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin
)) << PAGE_SHIFT
,
629 PFN_DOWN(__pa_symbol(&__init_end
)) << PAGE_SHIFT
,
632 pr_info("Determined physical RAM map:\n");
635 #ifdef CONFIG_CMDLINE_BOOL
636 #ifdef CONFIG_CMDLINE_OVERRIDE
637 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
639 if (builtin_cmdline
[0]) {
640 strlcat(arcs_cmdline
, " ", COMMAND_LINE_SIZE
);
641 strlcat(arcs_cmdline
, builtin_cmdline
, COMMAND_LINE_SIZE
);
643 strlcpy(boot_command_line
, arcs_cmdline
, COMMAND_LINE_SIZE
);
646 strlcpy(boot_command_line
, arcs_cmdline
, COMMAND_LINE_SIZE
);
648 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
650 *cmdline_p
= command_line
;
655 pr_info("User-defined physical RAM map:\n");
660 #ifdef CONFIG_PROC_VMCORE
661 if (setup_elfcorehdr
&& setup_elfcorehdr_size
) {
662 printk(KERN_INFO
"kdump reserved memory at %lx-%lx\n",
663 setup_elfcorehdr
, setup_elfcorehdr_size
);
664 reserve_bootmem(setup_elfcorehdr
, setup_elfcorehdr_size
,
669 mips_parse_crashkernel();
671 if (crashk_res
.start
!= crashk_res
.end
)
672 reserve_bootmem(crashk_res
.start
,
673 crashk_res
.end
- crashk_res
.start
+ 1,
678 plat_swiotlb_setup();
681 dma_contiguous_reserve(PFN_PHYS(max_low_pfn
));
682 /* Tell bootmem about cma reserved memblock section */
683 for_each_memblock(reserved
, reg
)
685 reserve_bootmem(reg
->base
, reg
->size
, BOOTMEM_DEFAULT
);
688 static void __init
resource_init(void)
692 if (UNCAC_BASE
!= IO_BASE
)
695 code_resource
.start
= __pa_symbol(&_text
);
696 code_resource
.end
= __pa_symbol(&_etext
) - 1;
697 data_resource
.start
= __pa_symbol(&_etext
);
698 data_resource
.end
= __pa_symbol(&_edata
) - 1;
700 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
701 struct resource
*res
;
702 unsigned long start
, end
;
704 start
= boot_mem_map
.map
[i
].addr
;
705 end
= boot_mem_map
.map
[i
].addr
+ boot_mem_map
.map
[i
].size
- 1;
706 if (start
>= HIGHMEM_START
)
708 if (end
>= HIGHMEM_START
)
709 end
= HIGHMEM_START
- 1;
711 res
= alloc_bootmem(sizeof(struct resource
));
712 switch (boot_mem_map
.map
[i
].type
) {
714 case BOOT_MEM_INIT_RAM
:
715 case BOOT_MEM_ROM_DATA
:
716 res
->name
= "System RAM";
718 case BOOT_MEM_RESERVED
:
720 res
->name
= "reserved";
726 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
727 request_resource(&iomem_resource
, res
);
730 * We don't know which RAM region contains kernel data,
731 * so we try it repeatedly and let the resource manager
734 request_resource(res
, &code_resource
);
735 request_resource(res
, &data_resource
);
736 request_crashkernel(res
);
741 static void __init
prefill_possible_map(void)
743 int i
, possible
= num_possible_cpus();
745 if (possible
> nr_cpu_ids
)
746 possible
= nr_cpu_ids
;
748 for (i
= 0; i
< possible
; i
++)
749 set_cpu_possible(i
, true);
750 for (; i
< NR_CPUS
; i
++)
751 set_cpu_possible(i
, false);
753 nr_cpu_ids
= possible
;
756 static inline void prefill_possible_map(void) {}
759 void __init
setup_arch(char **cmdline_p
)
764 setup_early_fdc_console();
765 #ifdef CONFIG_EARLY_PRINTK
766 setup_early_printk();
771 #if defined(CONFIG_VT)
772 #if defined(CONFIG_VGA_CONSOLE)
773 conswitchp
= &vga_con
;
774 #elif defined(CONFIG_DUMMY_CONSOLE)
775 conswitchp
= &dummy_con
;
779 arch_mem_init(cmdline_p
);
783 prefill_possible_map();
788 unsigned long kernelsp
[NR_CPUS
];
789 unsigned long fw_arg0
, fw_arg1
, fw_arg2
, fw_arg3
;
791 #ifdef CONFIG_DEBUG_FS
792 struct dentry
*mips_debugfs_dir
;
793 static int __init
debugfs_mips(void)
797 d
= debugfs_create_dir("mips", NULL
);
800 mips_debugfs_dir
= d
;
803 arch_initcall(debugfs_mips
);