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) 1994 - 2000 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
9 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/signal.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/string.h>
18 #include <linux/types.h>
19 #include <linux/pagemap.h>
20 #include <linux/ptrace.h>
21 #include <linux/mman.h>
23 #include <linux/bootmem.h>
24 #include <linux/highmem.h>
25 #include <linux/swap.h>
26 #include <linux/proc_fs.h>
27 #include <linux/pfn.h>
29 #include <asm/bootinfo.h>
30 #include <asm/cachectl.h>
33 #include <asm/kmap_types.h>
34 #include <asm/mmu_context.h>
35 #include <asm/sections.h>
36 #include <asm/pgtable.h>
37 #include <asm/pgalloc.h>
39 #include <asm/fixmap.h>
41 /* Atomicity and interruptability */
42 #ifdef CONFIG_MIPS_MT_SMTC
44 #include <asm/mipsmtregs.h>
46 #define ENTER_CRITICAL(flags) \
48 unsigned int mvpflags; \
49 local_irq_save(flags);\
51 #define EXIT_CRITICAL(flags) \
53 local_irq_restore(flags); \
57 #define ENTER_CRITICAL(flags) local_irq_save(flags)
58 #define EXIT_CRITICAL(flags) local_irq_restore(flags)
60 #endif /* CONFIG_MIPS_MT_SMTC */
62 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
65 * We have up to 8 empty zeroed pages so we can map one of the right colour
66 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
67 * where we have to avoid VCED / VECI exceptions for good performance at
68 * any price. Since page is never written to after the initialization we
69 * don't have to care about aliases on other CPUs.
71 unsigned long empty_zero_page
, zero_page_mask
;
74 * Not static inline because used by IP27 special magic initialization code
76 unsigned long setup_zero_pages(void)
87 empty_zero_page
= __get_free_pages(GFP_KERNEL
| __GFP_ZERO
, order
);
89 panic("Oh boy, that early out of memory?");
91 page
= virt_to_page((void *)empty_zero_page
);
92 split_page(page
, order
);
93 while (page
< virt_to_page((void *)(empty_zero_page
+ (PAGE_SIZE
<< order
)))) {
94 SetPageReserved(page
);
98 size
= PAGE_SIZE
<< order
;
99 zero_page_mask
= (size
- 1) & PAGE_MASK
;
105 * These are almost like kmap_atomic / kunmap_atmic except they take an
106 * additional address argument as the hint.
109 #define kmap_get_fixmap_pte(vaddr) \
110 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
112 #ifdef CONFIG_MIPS_MT_SMTC
113 static pte_t
*kmap_coherent_pte
;
114 static void __init
kmap_coherent_init(void)
118 /* cache the first coherent kmap pte */
119 vaddr
= __fix_to_virt(FIX_CMAP_BEGIN
);
120 kmap_coherent_pte
= kmap_get_fixmap_pte(vaddr
);
123 static inline void kmap_coherent_init(void) {}
126 void *kmap_coherent(struct page
*page
, unsigned long addr
)
128 enum fixed_addresses idx
;
129 unsigned long vaddr
, flags
, entrylo
;
130 unsigned long old_ctx
;
135 idx
= (addr
>> PAGE_SHIFT
) & (FIX_N_COLOURS
- 1);
136 #ifdef CONFIG_MIPS_MT_SMTC
137 idx
+= FIX_N_COLOURS
* smp_processor_id();
139 vaddr
= __fix_to_virt(FIX_CMAP_END
- idx
);
140 pte
= mk_pte(page
, PAGE_KERNEL
);
141 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
142 entrylo
= pte
.pte_high
;
144 entrylo
= pte_val(pte
) >> 6;
147 ENTER_CRITICAL(flags
);
148 old_ctx
= read_c0_entryhi();
149 write_c0_entryhi(vaddr
& (PAGE_MASK
<< 1));
150 write_c0_entrylo0(entrylo
);
151 write_c0_entrylo1(entrylo
);
152 #ifdef CONFIG_MIPS_MT_SMTC
153 set_pte(kmap_coherent_pte
- (FIX_CMAP_END
- idx
), pte
);
154 /* preload TLB instead of local_flush_tlb_one() */
158 tlbidx
= read_c0_index();
165 tlbidx
= read_c0_wired();
166 write_c0_wired(tlbidx
+ 1);
167 write_c0_index(tlbidx
);
172 write_c0_entryhi(old_ctx
);
173 EXIT_CRITICAL(flags
);
175 return (void*) vaddr
;
178 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
180 void kunmap_coherent(void)
182 #ifndef CONFIG_MIPS_MT_SMTC
184 unsigned long flags
, old_ctx
;
186 ENTER_CRITICAL(flags
);
187 old_ctx
= read_c0_entryhi();
188 wired
= read_c0_wired() - 1;
189 write_c0_wired(wired
);
190 write_c0_index(wired
);
191 write_c0_entryhi(UNIQUE_ENTRYHI(wired
));
192 write_c0_entrylo0(0);
193 write_c0_entrylo1(0);
197 write_c0_entryhi(old_ctx
);
198 EXIT_CRITICAL(flags
);
201 preempt_check_resched();
204 void copy_user_highpage(struct page
*to
, struct page
*from
,
205 unsigned long vaddr
, struct vm_area_struct
*vma
)
209 vto
= kmap_atomic(to
, KM_USER1
);
210 if (cpu_has_dc_aliases
) {
211 vfrom
= kmap_coherent(from
, vaddr
);
212 copy_page(vto
, vfrom
);
215 vfrom
= kmap_atomic(from
, KM_USER0
);
216 copy_page(vto
, vfrom
);
217 kunmap_atomic(vfrom
, KM_USER0
);
219 if (((vma
->vm_flags
& VM_EXEC
) && !cpu_has_ic_fills_f_dc
) ||
220 pages_do_alias((unsigned long)vto
, vaddr
& PAGE_MASK
))
221 flush_data_cache_page((unsigned long)vto
);
222 kunmap_atomic(vto
, KM_USER1
);
223 /* Make sure this page is cleared on other CPU's too before using it */
227 EXPORT_SYMBOL(copy_user_highpage
);
229 void copy_to_user_page(struct vm_area_struct
*vma
,
230 struct page
*page
, unsigned long vaddr
, void *dst
, const void *src
,
233 if (cpu_has_dc_aliases
) {
234 void *vto
= kmap_coherent(page
, vaddr
) + (vaddr
& ~PAGE_MASK
);
235 memcpy(vto
, src
, len
);
238 memcpy(dst
, src
, len
);
239 if ((vma
->vm_flags
& VM_EXEC
) && !cpu_has_ic_fills_f_dc
)
240 flush_cache_page(vma
, vaddr
, page_to_pfn(page
));
243 EXPORT_SYMBOL(copy_to_user_page
);
245 void copy_from_user_page(struct vm_area_struct
*vma
,
246 struct page
*page
, unsigned long vaddr
, void *dst
, const void *src
,
249 if (cpu_has_dc_aliases
) {
251 kmap_coherent(page
, vaddr
) + (vaddr
& ~PAGE_MASK
);
252 memcpy(dst
, vfrom
, len
);
255 memcpy(dst
, src
, len
);
258 EXPORT_SYMBOL(copy_from_user_page
);
261 #ifdef CONFIG_HIGHMEM
262 unsigned long highstart_pfn
, highend_pfn
;
267 static void __init
kmap_init(void)
269 unsigned long kmap_vstart
;
271 /* cache the first kmap pte */
272 kmap_vstart
= __fix_to_virt(FIX_KMAP_BEGIN
);
273 kmap_pte
= kmap_get_fixmap_pte(kmap_vstart
);
275 kmap_prot
= PAGE_KERNEL
;
277 #endif /* CONFIG_HIGHMEM */
279 void __init
fixrange_init(unsigned long start
, unsigned long end
,
282 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
291 i
= __pgd_offset(vaddr
);
292 j
= __pud_offset(vaddr
);
293 k
= __pmd_offset(vaddr
);
296 for ( ; (i
< PTRS_PER_PGD
) && (vaddr
!= end
); pgd
++, i
++) {
298 for ( ; (j
< PTRS_PER_PUD
) && (vaddr
!= end
); pud
++, j
++) {
300 for (; (k
< PTRS_PER_PMD
) && (vaddr
!= end
); pmd
++, k
++) {
301 if (pmd_none(*pmd
)) {
302 pte
= (pte_t
*) alloc_bootmem_low_pages(PAGE_SIZE
);
303 set_pmd(pmd
, __pmd((unsigned long)pte
));
304 if (pte
!= pte_offset_kernel(pmd
, 0))
316 #ifndef CONFIG_NEED_MULTIPLE_NODES
317 static int __init
page_is_ram(unsigned long pagenr
)
321 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
322 unsigned long addr
, end
;
324 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
325 /* not usable memory */
328 addr
= 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 (pagenr
>= addr
&& pagenr
< end
)
339 void __init
paging_init(void)
341 unsigned long zones_size
[MAX_NR_ZONES
] = { 0, };
342 #ifndef CONFIG_FLATMEM
343 unsigned long zholes_size
[MAX_NR_ZONES
] = { 0, };
344 unsigned long i
, j
, pfn
;
349 #ifdef CONFIG_HIGHMEM
352 kmap_coherent_init();
354 #ifdef CONFIG_ZONE_DMA
355 if (min_low_pfn
< MAX_DMA_PFN
&& MAX_DMA_PFN
<= max_low_pfn
) {
356 zones_size
[ZONE_DMA
] = MAX_DMA_PFN
- min_low_pfn
;
357 zones_size
[ZONE_NORMAL
] = max_low_pfn
- MAX_DMA_PFN
;
358 } else if (max_low_pfn
< MAX_DMA_PFN
)
359 zones_size
[ZONE_DMA
] = max_low_pfn
- min_low_pfn
;
362 zones_size
[ZONE_NORMAL
] = max_low_pfn
- min_low_pfn
;
364 #ifdef CONFIG_HIGHMEM
365 zones_size
[ZONE_HIGHMEM
] = highend_pfn
- highstart_pfn
;
367 if (cpu_has_dc_aliases
&& zones_size
[ZONE_HIGHMEM
]) {
368 printk(KERN_WARNING
"This processor doesn't support highmem."
369 " %ldk highmem ignored\n", zones_size
[ZONE_HIGHMEM
]);
370 zones_size
[ZONE_HIGHMEM
] = 0;
374 #ifdef CONFIG_FLATMEM
375 free_area_init(zones_size
);
378 for (i
= 0; i
< MAX_NR_ZONES
; i
++)
379 for (j
= 0; j
< zones_size
[i
]; j
++, pfn
++)
380 if (!page_is_ram(pfn
))
382 free_area_init_node(0, NODE_DATA(0), zones_size
, 0, zholes_size
);
386 static struct kcore_list kcore_mem
, kcore_vmalloc
;
388 static struct kcore_list kcore_kseg0
;
391 void __init
mem_init(void)
393 unsigned long codesize
, reservedpages
, datasize
, initsize
;
394 unsigned long tmp
, ram
;
396 #ifdef CONFIG_HIGHMEM
397 #ifdef CONFIG_DISCONTIGMEM
398 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
400 max_mapnr
= highend_pfn
;
402 max_mapnr
= max_low_pfn
;
404 high_memory
= (void *) __va(max_low_pfn
<< PAGE_SHIFT
);
406 totalram_pages
+= free_all_bootmem();
407 totalram_pages
-= setup_zero_pages(); /* Setup zeroed pages. */
409 reservedpages
= ram
= 0;
410 for (tmp
= 0; tmp
< max_low_pfn
; tmp
++)
411 if (page_is_ram(tmp
)) {
413 if (PageReserved(pfn_to_page(tmp
)))
418 #ifdef CONFIG_HIGHMEM
419 for (tmp
= highstart_pfn
; tmp
< highend_pfn
; tmp
++) {
420 struct page
*page
= mem_map
+ tmp
;
422 if (!page_is_ram(tmp
)) {
423 SetPageReserved(page
);
426 ClearPageReserved(page
);
427 init_page_count(page
);
431 totalram_pages
+= totalhigh_pages
;
432 num_physpages
+= totalhigh_pages
;
435 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
436 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
437 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
440 if ((unsigned long) &_text
> (unsigned long) CKSEG0
)
441 /* The -4 is a hack so that user tools don't have to handle
443 kclist_add(&kcore_kseg0
, (void *) CKSEG0
, 0x80000000 - 4);
445 kclist_add(&kcore_mem
, __va(0), max_low_pfn
<< PAGE_SHIFT
);
446 kclist_add(&kcore_vmalloc
, (void *)VMALLOC_START
,
447 VMALLOC_END
-VMALLOC_START
);
449 printk(KERN_INFO
"Memory: %luk/%luk available (%ldk kernel code, "
450 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
451 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
452 ram
<< (PAGE_SHIFT
-10),
454 reservedpages
<< (PAGE_SHIFT
-10),
457 (unsigned long) (totalhigh_pages
<< (PAGE_SHIFT
-10)));
459 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
461 void free_init_pages(const char *what
, unsigned long begin
, unsigned long end
)
465 for (pfn
= PFN_UP(begin
); pfn
< PFN_DOWN(end
); pfn
++) {
466 struct page
*page
= pfn_to_page(pfn
);
467 void *addr
= phys_to_virt(PFN_PHYS(pfn
));
469 ClearPageReserved(page
);
470 init_page_count(page
);
471 memset(addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
475 printk(KERN_INFO
"Freeing %s: %ldk freed\n", what
, (end
- begin
) >> 10);
478 #ifdef CONFIG_BLK_DEV_INITRD
479 void free_initrd_mem(unsigned long start
, unsigned long end
)
481 free_init_pages("initrd memory",
482 virt_to_phys((void *)start
),
483 virt_to_phys((void *)end
));
487 void free_initmem(void)
489 prom_free_prom_memory();
490 free_init_pages("unused kernel memory",
491 __pa_symbol(&__init_begin
),
492 __pa_symbol(&__init_end
));
495 unsigned long pgd_current
[NR_CPUS
];
497 * On 64-bit we've got three-level pagetables with a slightly
498 * different layout ...
500 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
501 pgd_t swapper_pg_dir
[PTRS_PER_PGD
] __page_aligned(PGD_ORDER
);
504 pgd_t module_pg_dir
[PTRS_PER_PGD
] __page_aligned(PGD_ORDER
);
506 pmd_t invalid_pmd_table
[PTRS_PER_PMD
] __page_aligned(PMD_ORDER
);
508 pte_t invalid_pte_table
[PTRS_PER_PTE
] __page_aligned(PTE_ORDER
);