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/bug.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/signal.h>
15 #include <linux/sched.h>
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/string.h>
19 #include <linux/types.h>
20 #include <linux/pagemap.h>
21 #include <linux/ptrace.h>
22 #include <linux/mman.h>
24 #include <linux/bootmem.h>
25 #include <linux/highmem.h>
26 #include <linux/swap.h>
27 #include <linux/proc_fs.h>
28 #include <linux/pfn.h>
29 #include <linux/hardirq.h>
31 #include <asm/bootinfo.h>
32 #include <asm/cachectl.h>
35 #include <asm/kmap_types.h>
36 #include <asm/mmu_context.h>
37 #include <asm/sections.h>
38 #include <asm/pgtable.h>
39 #include <asm/pgalloc.h>
41 #include <asm/fixmap.h>
43 /* Atomicity and interruptability */
44 #ifdef CONFIG_MIPS_MT_SMTC
46 #include <asm/mipsmtregs.h>
48 #define ENTER_CRITICAL(flags) \
50 unsigned int mvpflags; \
51 local_irq_save(flags);\
53 #define EXIT_CRITICAL(flags) \
55 local_irq_restore(flags); \
59 #define ENTER_CRITICAL(flags) local_irq_save(flags)
60 #define EXIT_CRITICAL(flags) local_irq_restore(flags)
62 #endif /* CONFIG_MIPS_MT_SMTC */
64 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
65 extern void cpu_early_probe_cache();
68 * We have up to 8 empty zeroed pages so we can map one of the right colour
69 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
70 * where we have to avoid VCED / VECI exceptions for good performance at
71 * any price. Since page is never written to after the initialization we
72 * don't have to care about aliases on other CPUs.
74 unsigned long empty_zero_page
, zero_page_mask
;
77 * Not static inline because used by IP27 special magic initialization code
79 unsigned long setup_zero_pages(void)
90 empty_zero_page
= __get_free_pages(GFP_KERNEL
| __GFP_ZERO
, order
);
92 panic("Oh boy, that early out of memory?");
94 page
= virt_to_page((void *)empty_zero_page
);
95 split_page(page
, order
);
96 while (page
< virt_to_page((void *)(empty_zero_page
+ (PAGE_SIZE
<< order
)))) {
97 SetPageReserved(page
);
101 size
= PAGE_SIZE
<< order
;
102 zero_page_mask
= (size
- 1) & PAGE_MASK
;
108 * These are almost like kmap_atomic / kunmap_atmic except they take an
109 * additional address argument as the hint.
112 #define kmap_get_fixmap_pte(vaddr) \
113 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
115 #ifdef CONFIG_MIPS_MT_SMTC
116 static pte_t
*kmap_coherent_pte
;
117 static void __init
kmap_coherent_init(void)
121 /* cache the first coherent kmap pte */
122 vaddr
= __fix_to_virt(FIX_CMAP_BEGIN
);
123 kmap_coherent_pte
= kmap_get_fixmap_pte(vaddr
);
126 static inline void kmap_coherent_init(void) {}
129 void *kmap_coherent(struct page
*page
, unsigned long addr
)
131 enum fixed_addresses idx
;
132 unsigned long vaddr
, flags
, entrylo
;
133 unsigned long old_ctx
;
137 BUG_ON(Page_dcache_dirty(page
));
140 idx
= (addr
>> PAGE_SHIFT
) & (FIX_N_COLOURS
- 1);
141 #ifdef CONFIG_MIPS_MT_SMTC
142 idx
+= FIX_N_COLOURS
* smp_processor_id() +
143 (in_interrupt() ? (FIX_N_COLOURS
* NR_CPUS
) : 0);
145 idx
+= in_interrupt() ? FIX_N_COLOURS
: 0;
147 vaddr
= __fix_to_virt(FIX_CMAP_END
- idx
);
148 pte
= mk_pte(page
, PAGE_KERNEL
);
149 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
150 entrylo
= pte
.pte_high
;
152 entrylo
= pte_val(pte
) >> 6;
155 ENTER_CRITICAL(flags
);
156 old_ctx
= read_c0_entryhi();
157 write_c0_entryhi(vaddr
& (PAGE_MASK
<< 1));
158 write_c0_entrylo0(entrylo
);
159 write_c0_entrylo1(entrylo
);
160 #ifdef CONFIG_MIPS_MT_SMTC
161 set_pte(kmap_coherent_pte
- (FIX_CMAP_END
- idx
), pte
);
162 /* preload TLB instead of local_flush_tlb_one() */
166 tlbidx
= read_c0_index();
173 tlbidx
= read_c0_wired();
174 write_c0_wired(tlbidx
+ 1);
175 write_c0_index(tlbidx
);
180 write_c0_entryhi(old_ctx
);
181 EXIT_CRITICAL(flags
);
183 return (void*) vaddr
;
186 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
188 void kunmap_coherent(void)
190 #ifndef CONFIG_MIPS_MT_SMTC
192 unsigned long flags
, old_ctx
;
194 ENTER_CRITICAL(flags
);
195 old_ctx
= read_c0_entryhi();
196 wired
= read_c0_wired() - 1;
197 write_c0_wired(wired
);
198 write_c0_index(wired
);
199 write_c0_entryhi(UNIQUE_ENTRYHI(wired
));
200 write_c0_entrylo0(0);
201 write_c0_entrylo1(0);
205 write_c0_entryhi(old_ctx
);
206 EXIT_CRITICAL(flags
);
209 preempt_check_resched();
213 void copy_user_highpage(struct page
*to
, struct page
*from
,
214 unsigned long vaddr
, struct vm_area_struct
*vma
)
218 vto
= kmap_atomic(to
, KM_USER1
);
219 if(cpu_has_dc_aliases
) {
220 vfrom
= kmap_coherent(from
, vaddr
);
221 copy_page(vto
, vfrom
);
224 vfrom
= kmap_atomic(from
, KM_USER0
);
225 copy_page(vto
, vfrom
);
226 kunmap_atomic(vfrom
, KM_USER0
);
228 if (((vma
->vm_flags
& VM_EXEC
) && !cpu_has_ic_fills_f_dc
) ||
229 pages_do_alias((unsigned long)vto
, vaddr
& PAGE_MASK
))
230 flush_data_cache_page((unsigned long)vto
);
231 kunmap_atomic(vto
, KM_USER1
);
232 /* Make sure this page is cleared on other CPU's too before using it */
236 EXPORT_SYMBOL(copy_user_highpage
);
239 void copy_to_user_page(struct vm_area_struct
*vma
,
240 struct page
*page
, unsigned long vaddr
, void *dst
, const void *src
,
243 if (cpu_has_dc_aliases
&&
244 page_mapped(page
) && !Page_dcache_dirty(page
)) {
245 void *vto
= kmap_coherent(page
, vaddr
) + (vaddr
& ~PAGE_MASK
);
246 memcpy(vto
, src
, len
);
247 flush_data_cache_page((unsigned long)vto
& PAGE_MASK
);
250 memcpy(dst
, src
, len
);
251 if (cpu_has_dc_aliases
)
252 SetPageDcacheDirty(page
);
254 if ((vma
->vm_flags
& VM_EXEC
) && !cpu_has_ic_fills_f_dc
)
255 flush_cache_page(vma
, vaddr
, page_to_pfn(page
));
258 EXPORT_SYMBOL(copy_to_user_page
);
260 void copy_from_user_page(struct vm_area_struct
*vma
,
261 struct page
*page
, unsigned long vaddr
, void *dst
, const void *src
,
264 if (cpu_has_dc_aliases
&&
265 page_mapped(page
) && !Page_dcache_dirty(page
)) {
266 void *vfrom
= kmap_coherent(page
, vaddr
) + (vaddr
& ~PAGE_MASK
);
267 memcpy(dst
, vfrom
, len
);
270 memcpy(dst
, src
, len
);
271 if (cpu_has_dc_aliases
)
272 SetPageDcacheDirty(page
);
276 EXPORT_SYMBOL(copy_from_user_page
);
279 #ifdef CONFIG_HIGHMEM
280 unsigned long highstart_pfn
, highend_pfn
;
285 static void __init
kmap_init(void)
287 unsigned long kmap_vstart
;
289 /* cache the first kmap pte */
290 kmap_vstart
= __fix_to_virt(VALIAS_IDX(FIX_KMAP_BEGIN
));
291 kmap_pte
= kmap_get_fixmap_pte(kmap_vstart
);
293 kmap_prot
= PAGE_KERNEL
;
295 #endif /* CONFIG_HIGHMEM */
297 void __init
fixrange_init(unsigned long start
, unsigned long end
,
300 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
309 i
= __pgd_offset(vaddr
);
310 j
= __pud_offset(vaddr
);
311 k
= __pmd_offset(vaddr
);
314 for ( ; (i
< PTRS_PER_PGD
) && (vaddr
< end
); pgd
++, i
++) {
316 for ( ; (j
< PTRS_PER_PUD
) && (vaddr
< end
); pud
++, j
++) {
318 for (; (k
< PTRS_PER_PMD
) && (vaddr
< end
); pmd
++, k
++) {
319 if (pmd_none(*pmd
)) {
320 pte
= (pte_t
*) alloc_bootmem_low_pages(PAGE_SIZE
);
321 set_pmd(pmd
, __pmd((unsigned long)pte
));
322 if (pte
!= pte_offset_kernel(pmd
, 0))
334 #ifndef CONFIG_NEED_MULTIPLE_NODES
335 static int __init
page_is_ram(unsigned long pagenr
)
339 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
340 unsigned long addr
, end
;
342 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
343 /* not usable memory */
346 addr
= PFN_UP(boot_mem_map
.map
[i
].addr
);
347 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
+
348 boot_mem_map
.map
[i
].size
);
350 if (pagenr
>= addr
&& pagenr
< end
)
357 void __init
paging_init(void)
359 #ifdef CONFIG_FLATMEM
360 unsigned long zones_size
[MAX_NR_ZONES
] = { 0, };
361 #else /* SPARSEMEM */
362 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
363 unsigned long lastpfn
;
364 #endif /* CONFIG_FLATMEM */
366 cpu_early_probe_cache();
370 #ifdef CONFIG_HIGHMEM
373 kmap_coherent_init();
375 #ifdef CONFIG_FLATMEM
376 #ifdef CONFIG_ZONE_DMA
377 if (min_low_pfn
< MAX_DMA_PFN
&& MAX_DMA_PFN
<= max_low_pfn
) {
378 zones_size
[ZONE_DMA
] = MAX_DMA_PFN
- min_low_pfn
;
379 zones_size
[ZONE_NORMAL
] = max_low_pfn
- MAX_DMA_PFN
;
380 } else if (max_low_pfn
< MAX_DMA_PFN
)
381 zones_size
[ZONE_DMA
] = max_low_pfn
- min_low_pfn
;
383 #endif /* CONFIG_ZONE_DMA */
384 zones_size
[ZONE_NORMAL
] = max_low_pfn
- min_low_pfn
;
386 #ifdef CONFIG_HIGHMEM
387 zones_size
[ZONE_HIGHMEM
] = highend_pfn
- highstart_pfn
;
390 if (cpu_has_dc_aliases
&& zones_size
[ZONE_HIGHMEM
]) {
391 printk(KERN_WARNING
"This processor doesn't support highmem."
392 " %ldk highmem ignored\n", zones_size
[ZONE_HIGHMEM
]);
393 zones_size
[ZONE_HIGHMEM
] = 0;
395 #endif /* CONFIG_HIGHMEM */
397 free_area_init(zones_size
);
399 #else /* SPARSEMEM */
401 #ifdef CONFIG_ZONE_DMA
402 max_zone_pfns
[ZONE_DMA
] = MAX_DMA_PFN
;
403 #endif /* CONFIG_ZONE_DMA */
405 #ifdef CONFIG_ZONE_DMA32
406 max_zone_pfns
[ZONE_DMA32
] = MAX_DMA32_PFN
;
407 #endif /* CONFIG_ZONE_DMA32 */
408 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
409 lastpfn
= max_low_pfn
;
411 #ifdef CONFIG_HIGHMEM
412 max_zone_pfns
[ZONE_HIGHMEM
] = highend_pfn
;
413 lastpfn
= highend_pfn
;
415 if (cpu_has_dc_aliases
&& max_low_pfn
!= highend_pfn
) {
416 printk(KERN_WARNING
"This processor doesn't support highmem."
417 " %ldk highmem ignored\n",
418 (highend_pfn
- max_low_pfn
) << (PAGE_SHIFT
- 10));
419 max_zone_pfns
[ZONE_HIGHMEM
] = max_low_pfn
;
420 lastpfn
= max_low_pfn
;
422 #endif /* CONFIG_HIGHMEM */
424 free_area_init_nodes(max_zone_pfns
);
425 #endif /* CONFIG_FLATMEM */
428 static struct kcore_list kcore_mem
, kcore_vmalloc
;
430 static struct kcore_list kcore_kseg0
;
433 void __init
mem_init(void)
435 unsigned long codesize
, reservedpages
, datasize
, initsize
;
436 unsigned long tmp
, ram
;
438 #ifdef CONFIG_HIGHMEM
439 #ifdef CONFIG_DISCONTIGMEM
440 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
442 max_mapnr
= max(max_low_pfn
, highend_pfn
);
444 max_mapnr
= max_low_pfn
;
446 high_memory
= (void *) __va(max_low_pfn
<< PAGE_SHIFT
);
448 totalram_pages
+= free_all_bootmem();
449 totalram_pages
-= setup_zero_pages(); /* Setup zeroed pages. */
451 reservedpages
= ram
= 0;
452 for (tmp
= 0; tmp
< max_low_pfn
; tmp
++)
453 if (page_is_ram(tmp
)) {
455 if (PageReserved(pfn_to_page(tmp
)))
460 #ifdef CONFIG_HIGHMEM
461 for (tmp
= highstart_pfn
; tmp
< highend_pfn
; tmp
++) {
464 if (!page_is_ram(tmp
))
467 page
= pfn_to_page(tmp
);
468 ClearPageReserved(page
);
469 init_page_count(page
);
473 totalram_pages
+= totalhigh_pages
;
474 num_physpages
+= totalhigh_pages
;
477 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
478 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
479 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
482 if ((unsigned long) &_text
> (unsigned long) CKSEG0
)
483 /* The -4 is a hack so that user tools don't have to handle
485 kclist_add(&kcore_kseg0
, (void *) CKSEG0
, 0x80000000 - 4);
487 kclist_add(&kcore_mem
, __va(0), max_low_pfn
<< PAGE_SHIFT
);
488 kclist_add(&kcore_vmalloc
, (void *)VMALLOC_START
,
489 VMALLOC_END
-VMALLOC_START
);
491 printk(KERN_INFO
"Memory: %luk/%luk available (%ldk kernel code, "
492 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
493 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
494 ram
<< (PAGE_SHIFT
-10),
496 reservedpages
<< (PAGE_SHIFT
-10),
499 (unsigned long) (totalhigh_pages
<< (PAGE_SHIFT
-10)));
501 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
503 void free_init_pages(const char *what
, unsigned long begin
, unsigned long end
)
507 for (pfn
= PFN_UP(begin
); pfn
< PFN_DOWN(end
); pfn
++) {
508 struct page
*page
= pfn_to_page(pfn
);
509 void *addr
= phys_to_virt(PFN_PHYS(pfn
));
511 ClearPageReserved(page
);
512 init_page_count(page
);
513 memset(addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
517 printk(KERN_INFO
"Freeing %s: %ldk freed\n", what
, (end
- begin
) >> 10);
520 #ifdef CONFIG_BLK_DEV_INITRD
521 void free_initrd_mem(unsigned long start
, unsigned long end
)
523 free_init_pages("initrd memory",
524 virt_to_phys((void *)start
),
525 virt_to_phys((void *)end
));
529 void free_initmem(void)
531 prom_free_prom_memory();
532 free_init_pages("unused kernel memory",
533 __pa_symbol(&__init_begin
),
534 __pa_symbol(&__init_end
));
537 unsigned long pgd_current
[NR_CPUS
];
539 * On 64-bit we've got three-level pagetables with a slightly
540 * different layout ...
542 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
543 pgd_t swapper_pg_dir
[PTRS_PER_PGD
] __page_aligned(PGD_ORDER
);
546 pgd_t module_pg_dir
[PTRS_PER_PGD
] __page_aligned(PGD_ORDER
);
548 pmd_t invalid_pmd_table
[PTRS_PER_PMD
] __page_aligned(PMD_ORDER
);
550 pte_t invalid_pte_table
[PTRS_PER_PTE
] __page_aligned(PTE_ORDER
);