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/debug.h>
37 #include <asm/sections.h>
38 #include <asm/setup.h>
39 #include <asm/smp-ops.h>
42 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
43 const char __section(.appended_dtb
) __appended_dtb
[0x100000];
44 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
46 struct cpuinfo_mips cpu_data
[NR_CPUS
] __read_mostly
;
48 EXPORT_SYMBOL(cpu_data
);
51 struct screen_info screen_info
;
57 * These are initialized so they are in the .data section
59 unsigned long mips_machtype __read_mostly
= MACH_UNKNOWN
;
61 EXPORT_SYMBOL(mips_machtype
);
63 struct boot_mem_map boot_mem_map
;
65 static char __initdata command_line
[COMMAND_LINE_SIZE
];
66 char __initdata arcs_cmdline
[COMMAND_LINE_SIZE
];
68 #ifdef CONFIG_CMDLINE_BOOL
69 static char __initdata builtin_cmdline
[COMMAND_LINE_SIZE
] = CONFIG_CMDLINE
;
73 * mips_io_port_base is the begin of the address space to which x86 style
74 * I/O ports are mapped.
76 const unsigned long mips_io_port_base
= -1;
77 EXPORT_SYMBOL(mips_io_port_base
);
79 static struct resource code_resource
= { .name
= "Kernel code", };
80 static struct resource data_resource
= { .name
= "Kernel data", };
82 static void *detect_magic __initdata
= detect_memory_region
;
84 void __init
add_memory_region(phys_addr_t start
, phys_addr_t size
, long type
)
86 int x
= boot_mem_map
.nr_map
;
90 if (start
+ size
< start
) {
91 pr_warn("Trying to add an invalid memory region, skipped\n");
96 * Try to merge with existing entry, if any.
98 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
99 struct boot_mem_map_entry
*entry
= boot_mem_map
.map
+ i
;
102 if (entry
->type
!= type
)
105 if (start
+ size
< entry
->addr
)
106 continue; /* no overlap */
108 if (entry
->addr
+ entry
->size
< start
)
109 continue; /* no overlap */
111 top
= max(entry
->addr
+ entry
->size
, start
+ size
);
112 entry
->addr
= min(entry
->addr
, start
);
113 entry
->size
= top
- entry
->addr
;
118 if (boot_mem_map
.nr_map
== BOOT_MEM_MAP_MAX
) {
119 pr_err("Ooops! Too many entries in the memory map!\n");
123 boot_mem_map
.map
[x
].addr
= start
;
124 boot_mem_map
.map
[x
].size
= size
;
125 boot_mem_map
.map
[x
].type
= type
;
126 boot_mem_map
.nr_map
++;
129 void __init
detect_memory_region(phys_addr_t start
, phys_addr_t sz_min
, phys_addr_t sz_max
)
131 void *dm
= &detect_magic
;
134 for (size
= sz_min
; size
< sz_max
; size
<<= 1) {
135 if (!memcmp(dm
, dm
+ size
, sizeof(detect_magic
)))
139 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
140 ((unsigned long long) size
) / SZ_1M
,
141 (unsigned long long) start
,
142 ((unsigned long long) sz_min
) / SZ_1M
,
143 ((unsigned long long) sz_max
) / SZ_1M
);
145 add_memory_region(start
, size
, BOOT_MEM_RAM
);
148 static void __init
print_memory_map(void)
151 const int field
= 2 * sizeof(unsigned long);
153 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
154 printk(KERN_INFO
" memory: %0*Lx @ %0*Lx ",
155 field
, (unsigned long long) boot_mem_map
.map
[i
].size
,
156 field
, (unsigned long long) boot_mem_map
.map
[i
].addr
);
158 switch (boot_mem_map
.map
[i
].type
) {
160 printk(KERN_CONT
"(usable)\n");
162 case BOOT_MEM_INIT_RAM
:
163 printk(KERN_CONT
"(usable after init)\n");
165 case BOOT_MEM_ROM_DATA
:
166 printk(KERN_CONT
"(ROM data)\n");
168 case BOOT_MEM_RESERVED
:
169 printk(KERN_CONT
"(reserved)\n");
172 printk(KERN_CONT
"type %lu\n", boot_mem_map
.map
[i
].type
);
181 #ifdef CONFIG_BLK_DEV_INITRD
183 static int __init
rd_start_early(char *p
)
185 unsigned long start
= memparse(p
, &p
);
188 /* Guess if the sign extension was forgotten by bootloader */
192 initrd_start
= start
;
196 early_param("rd_start", rd_start_early
);
198 static int __init
rd_size_early(char *p
)
200 initrd_end
+= memparse(p
, &p
);
203 early_param("rd_size", rd_size_early
);
205 /* it returns the next free pfn after initrd */
206 static unsigned long __init
init_initrd(void)
211 * Board specific code or command line parser should have
212 * already set up initrd_start and initrd_end. In these cases
213 * perfom sanity checks and use them if all looks good.
215 if (!initrd_start
|| initrd_end
<= initrd_start
)
218 if (initrd_start
& ~PAGE_MASK
) {
219 pr_err("initrd start must be page aligned\n");
222 if (initrd_start
< PAGE_OFFSET
) {
223 pr_err("initrd start < PAGE_OFFSET\n");
228 * Sanitize initrd addresses. For example firmware
229 * can't guess if they need to pass them through
230 * 64-bits values if the kernel has been built in pure
231 * 32-bit. We need also to switch from KSEG0 to XKPHYS
232 * addresses now, so the code can now safely use __pa().
234 end
= __pa(initrd_end
);
235 initrd_end
= (unsigned long)__va(end
);
236 initrd_start
= (unsigned long)__va(__pa(initrd_start
));
238 ROOT_DEV
= Root_RAM0
;
246 static void __init
finalize_initrd(void)
248 unsigned long size
= initrd_end
- initrd_start
;
251 printk(KERN_INFO
"Initrd not found or empty");
254 if (__pa(initrd_end
) > PFN_PHYS(max_low_pfn
)) {
255 printk(KERN_ERR
"Initrd extends beyond end of memory");
259 reserve_bootmem(__pa(initrd_start
), size
, BOOTMEM_DEFAULT
);
260 initrd_below_start_ok
= 1;
262 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
266 printk(KERN_CONT
" - disabling initrd\n");
271 #else /* !CONFIG_BLK_DEV_INITRD */
273 static unsigned long __init
init_initrd(void)
278 #define finalize_initrd() do {} while (0)
283 * Initialize the bootmem allocator. It also setup initrd related data
286 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
288 static void __init
bootmem_init(void)
294 #else /* !CONFIG_SGI_IP27 */
296 static void __init
bootmem_init(void)
298 unsigned long reserved_end
;
299 unsigned long mapstart
= ~0UL;
300 unsigned long bootmap_size
;
304 * Sanity check any INITRD first. We don't take it into account
305 * for bootmem setup initially, rely on the end-of-kernel-code
306 * as our memory range starting point. Once bootmem is inited we
307 * will reserve the area used for the initrd.
310 reserved_end
= (unsigned long) PFN_UP(__pa_symbol(&_end
));
313 * max_low_pfn is not a number of pages. The number of pages
314 * of the system is given by 'max_low_pfn - min_low_pfn'.
320 * Find the highest page frame number we have available.
322 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
323 unsigned long start
, end
;
325 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
328 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
329 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
330 + boot_mem_map
.map
[i
].size
);
332 if (end
> max_low_pfn
)
334 if (start
< min_low_pfn
)
336 if (end
<= reserved_end
)
338 #ifdef CONFIG_BLK_DEV_INITRD
339 /* Skip zones before initrd and initrd itself */
340 if (initrd_end
&& end
<= (unsigned long)PFN_UP(__pa(initrd_end
)))
343 if (start
>= mapstart
)
345 mapstart
= max(reserved_end
, start
);
348 if (min_low_pfn
>= max_low_pfn
)
349 panic("Incorrect memory mapping !!!");
350 if (min_low_pfn
> ARCH_PFN_OFFSET
) {
351 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
352 (min_low_pfn
- ARCH_PFN_OFFSET
) * sizeof(struct page
),
353 min_low_pfn
- ARCH_PFN_OFFSET
);
354 } else if (min_low_pfn
< ARCH_PFN_OFFSET
) {
355 pr_info("%lu free pages won't be used\n",
356 ARCH_PFN_OFFSET
- min_low_pfn
);
358 min_low_pfn
= ARCH_PFN_OFFSET
;
361 * Determine low and high memory ranges
363 max_pfn
= max_low_pfn
;
364 if (max_low_pfn
> PFN_DOWN(HIGHMEM_START
)) {
365 #ifdef CONFIG_HIGHMEM
366 highstart_pfn
= PFN_DOWN(HIGHMEM_START
);
367 highend_pfn
= max_low_pfn
;
369 max_low_pfn
= PFN_DOWN(HIGHMEM_START
);
372 #ifdef CONFIG_BLK_DEV_INITRD
374 * mapstart should be after initrd_end
377 mapstart
= max(mapstart
, (unsigned long)PFN_UP(__pa(initrd_end
)));
381 * Initialize the boot-time allocator with low memory only.
383 bootmap_size
= init_bootmem_node(NODE_DATA(0), mapstart
,
384 min_low_pfn
, max_low_pfn
);
387 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
388 unsigned long start
, end
;
390 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
391 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
392 + boot_mem_map
.map
[i
].size
);
394 if (start
<= min_low_pfn
)
399 #ifndef CONFIG_HIGHMEM
400 if (end
> max_low_pfn
)
404 * ... finally, is the area going away?
410 memblock_add_node(PFN_PHYS(start
), PFN_PHYS(end
- start
), 0);
414 * Register fully available low RAM pages with the bootmem allocator.
416 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
417 unsigned long start
, end
, size
;
419 start
= PFN_UP(boot_mem_map
.map
[i
].addr
);
420 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
421 + boot_mem_map
.map
[i
].size
);
424 * Reserve usable memory.
426 switch (boot_mem_map
.map
[i
].type
) {
429 case BOOT_MEM_INIT_RAM
:
430 memory_present(0, start
, end
);
433 /* Not usable memory */
438 * We are rounding up the start address of usable memory
439 * and at the end of the usable range downwards.
441 if (start
>= max_low_pfn
)
443 if (start
< reserved_end
)
444 start
= reserved_end
;
445 if (end
> max_low_pfn
)
449 * ... finally, is the area going away?
455 /* Register lowmem ranges */
456 free_bootmem(PFN_PHYS(start
), size
<< PAGE_SHIFT
);
457 memory_present(0, start
, end
);
461 * Reserve the bootmap memory.
463 reserve_bootmem(PFN_PHYS(mapstart
), bootmap_size
, BOOTMEM_DEFAULT
);
465 #ifdef CONFIG_RELOCATABLE
467 * The kernel reserves all memory below its _end symbol as bootmem,
468 * but the kernel may now be at a much higher address. The memory
469 * between the original and new locations may be returned to the system.
471 if (__pa_symbol(_text
) > __pa_symbol(VMLINUX_LOAD_ADDRESS
)) {
472 unsigned long offset
;
473 extern void show_kernel_relocation(const char *level
);
475 offset
= __pa_symbol(_text
) - __pa_symbol(VMLINUX_LOAD_ADDRESS
);
476 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS
), offset
);
478 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
480 * This information is necessary when debugging the kernel
481 * But is a security vulnerability otherwise!
483 show_kernel_relocation(KERN_INFO
);
489 * Reserve initrd memory if needed.
494 #endif /* CONFIG_SGI_IP27 */
497 * arch_mem_init - initialize memory management subsystem
499 * o plat_mem_setup() detects the memory configuration and will record detected
500 * memory areas using add_memory_region.
502 * At this stage the memory configuration of the system is known to the
503 * kernel but generic memory management system is still entirely uninitialized.
508 * o dma_contiguous_reserve()
510 * At this stage the bootmem allocator is ready to use.
512 * NOTE: historically plat_mem_setup did the entire platform initialization.
513 * This was rather impractical because it meant plat_mem_setup had to
514 * get away without any kind of memory allocator. To keep old code from
515 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
516 * initialization hook for anything else was introduced.
519 static int usermem __initdata
;
521 static int __init
early_parse_mem(char *p
)
523 phys_addr_t start
, size
;
526 * If a user specifies memory size, we
527 * blow away any automatically generated
531 boot_mem_map
.nr_map
= 0;
535 size
= memparse(p
, &p
);
537 start
= memparse(p
+ 1, &p
);
539 add_memory_region(start
, size
, BOOT_MEM_RAM
);
542 early_param("mem", early_parse_mem
);
544 #ifdef CONFIG_PROC_VMCORE
545 unsigned long setup_elfcorehdr
, setup_elfcorehdr_size
;
546 static int __init
early_parse_elfcorehdr(char *p
)
550 setup_elfcorehdr
= memparse(p
, &p
);
552 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
553 unsigned long start
= boot_mem_map
.map
[i
].addr
;
554 unsigned long end
= (boot_mem_map
.map
[i
].addr
+
555 boot_mem_map
.map
[i
].size
);
556 if (setup_elfcorehdr
>= start
&& setup_elfcorehdr
< end
) {
558 * Reserve from the elf core header to the end of
559 * the memory segment, that should all be kdump
562 setup_elfcorehdr_size
= end
- setup_elfcorehdr
;
567 * If we don't find it in the memory map, then we shouldn't
568 * have to worry about it, as the new kernel won't use it.
572 early_param("elfcorehdr", early_parse_elfcorehdr
);
575 static void __init
arch_mem_addpart(phys_addr_t mem
, phys_addr_t end
, int type
)
584 /* Make sure it is in the boot_mem_map */
585 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
586 if (mem
>= boot_mem_map
.map
[i
].addr
&&
587 mem
< (boot_mem_map
.map
[i
].addr
+
588 boot_mem_map
.map
[i
].size
))
591 add_memory_region(mem
, size
, type
);
595 static inline unsigned long long get_total_mem(void)
597 unsigned long long total
;
599 total
= max_pfn
- min_low_pfn
;
600 return total
<< PAGE_SHIFT
;
603 static void __init
mips_parse_crashkernel(void)
605 unsigned long long total_mem
;
606 unsigned long long crash_size
, crash_base
;
609 total_mem
= get_total_mem();
610 ret
= parse_crashkernel(boot_command_line
, total_mem
,
611 &crash_size
, &crash_base
);
612 if (ret
!= 0 || crash_size
<= 0)
615 crashk_res
.start
= crash_base
;
616 crashk_res
.end
= crash_base
+ crash_size
- 1;
619 static void __init
request_crashkernel(struct resource
*res
)
623 ret
= request_resource(res
, &crashk_res
);
625 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
626 (unsigned long)((crashk_res
.end
-
627 crashk_res
.start
+ 1) >> 20),
628 (unsigned long)(crashk_res
.start
>> 20));
630 #else /* !defined(CONFIG_KEXEC) */
631 static void __init
mips_parse_crashkernel(void)
635 static void __init
request_crashkernel(struct resource
*res
)
638 #endif /* !defined(CONFIG_KEXEC) */
640 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
641 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
642 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
643 #define BUILTIN_EXTEND_WITH_PROM \
644 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
646 static void __init
arch_mem_init(char **cmdline_p
)
648 struct memblock_region
*reg
;
649 extern void plat_mem_setup(void);
651 /* call board setup routine */
655 * Make sure all kernel memory is in the maps. The "UP" and
656 * "DOWN" are opposite for initdata since if it crosses over
657 * into another memory section you don't want that to be
658 * freed when the initdata is freed.
660 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text
)) << PAGE_SHIFT
,
661 PFN_UP(__pa_symbol(&_edata
)) << PAGE_SHIFT
,
663 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin
)) << PAGE_SHIFT
,
664 PFN_DOWN(__pa_symbol(&__init_end
)) << PAGE_SHIFT
,
667 pr_info("Determined physical RAM map:\n");
670 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
671 strlcpy(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
673 if ((USE_PROM_CMDLINE
&& arcs_cmdline
[0]) ||
674 (USE_DTB_CMDLINE
&& !boot_command_line
[0]))
675 strlcpy(boot_command_line
, arcs_cmdline
, COMMAND_LINE_SIZE
);
677 if (EXTEND_WITH_PROM
&& arcs_cmdline
[0]) {
678 if (boot_command_line
[0])
679 strlcat(boot_command_line
, " ", COMMAND_LINE_SIZE
);
680 strlcat(boot_command_line
, arcs_cmdline
, COMMAND_LINE_SIZE
);
683 #if defined(CONFIG_CMDLINE_BOOL)
684 if (builtin_cmdline
[0]) {
685 if (boot_command_line
[0])
686 strlcat(boot_command_line
, " ", COMMAND_LINE_SIZE
);
687 strlcat(boot_command_line
, builtin_cmdline
, COMMAND_LINE_SIZE
);
690 if (BUILTIN_EXTEND_WITH_PROM
&& arcs_cmdline
[0]) {
691 if (boot_command_line
[0])
692 strlcat(boot_command_line
, " ", COMMAND_LINE_SIZE
);
693 strlcat(boot_command_line
, arcs_cmdline
, COMMAND_LINE_SIZE
);
697 strlcpy(command_line
, boot_command_line
, COMMAND_LINE_SIZE
);
699 *cmdline_p
= command_line
;
704 pr_info("User-defined physical RAM map:\n");
709 #ifdef CONFIG_PROC_VMCORE
710 if (setup_elfcorehdr
&& setup_elfcorehdr_size
) {
711 printk(KERN_INFO
"kdump reserved memory at %lx-%lx\n",
712 setup_elfcorehdr
, setup_elfcorehdr_size
);
713 reserve_bootmem(setup_elfcorehdr
, setup_elfcorehdr_size
,
718 mips_parse_crashkernel();
720 if (crashk_res
.start
!= crashk_res
.end
)
721 reserve_bootmem(crashk_res
.start
,
722 crashk_res
.end
- crashk_res
.start
+ 1,
727 plat_swiotlb_setup();
730 dma_contiguous_reserve(PFN_PHYS(max_low_pfn
));
731 /* Tell bootmem about cma reserved memblock section */
732 for_each_memblock(reserved
, reg
)
734 reserve_bootmem(reg
->base
, reg
->size
, BOOTMEM_DEFAULT
);
736 reserve_bootmem_region(__pa_symbol(&__nosave_begin
),
737 __pa_symbol(&__nosave_end
)); /* Reserve for hibernation */
740 static void __init
resource_init(void)
744 if (UNCAC_BASE
!= IO_BASE
)
747 code_resource
.start
= __pa_symbol(&_text
);
748 code_resource
.end
= __pa_symbol(&_etext
) - 1;
749 data_resource
.start
= __pa_symbol(&_etext
);
750 data_resource
.end
= __pa_symbol(&_edata
) - 1;
752 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
753 struct resource
*res
;
754 unsigned long start
, end
;
756 start
= boot_mem_map
.map
[i
].addr
;
757 end
= boot_mem_map
.map
[i
].addr
+ boot_mem_map
.map
[i
].size
- 1;
758 if (start
>= HIGHMEM_START
)
760 if (end
>= HIGHMEM_START
)
761 end
= HIGHMEM_START
- 1;
763 res
= alloc_bootmem(sizeof(struct resource
));
767 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
769 switch (boot_mem_map
.map
[i
].type
) {
771 case BOOT_MEM_INIT_RAM
:
772 case BOOT_MEM_ROM_DATA
:
773 res
->name
= "System RAM";
774 res
->flags
|= IORESOURCE_SYSRAM
;
776 case BOOT_MEM_RESERVED
:
778 res
->name
= "reserved";
781 request_resource(&iomem_resource
, res
);
784 * We don't know which RAM region contains kernel data,
785 * so we try it repeatedly and let the resource manager
788 request_resource(res
, &code_resource
);
789 request_resource(res
, &data_resource
);
790 request_crashkernel(res
);
795 static void __init
prefill_possible_map(void)
797 int i
, possible
= num_possible_cpus();
799 if (possible
> nr_cpu_ids
)
800 possible
= nr_cpu_ids
;
802 for (i
= 0; i
< possible
; i
++)
803 set_cpu_possible(i
, true);
804 for (; i
< NR_CPUS
; i
++)
805 set_cpu_possible(i
, false);
807 nr_cpu_ids
= possible
;
810 static inline void prefill_possible_map(void) {}
813 void __init
setup_arch(char **cmdline_p
)
819 setup_early_fdc_console();
820 #ifdef CONFIG_EARLY_PRINTK
821 setup_early_printk();
826 #if defined(CONFIG_VT)
827 #if defined(CONFIG_VGA_CONSOLE)
828 conswitchp
= &vga_con
;
829 #elif defined(CONFIG_DUMMY_CONSOLE)
830 conswitchp
= &dummy_con
;
834 arch_mem_init(cmdline_p
);
838 prefill_possible_map();
843 unsigned long kernelsp
[NR_CPUS
];
844 unsigned long fw_arg0
, fw_arg1
, fw_arg2
, fw_arg3
;
846 #ifdef CONFIG_DEBUG_FS
847 struct dentry
*mips_debugfs_dir
;
848 static int __init
debugfs_mips(void)
852 d
= debugfs_create_dir("mips", NULL
);
855 mips_debugfs_dir
= d
;
858 arch_initcall(debugfs_mips
);