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/smp.h>
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/string.h>
20 #include <linux/types.h>
21 #include <linux/pagemap.h>
22 #include <linux/ptrace.h>
23 #include <linux/mman.h>
25 #include <linux/bootmem.h>
26 #include <linux/highmem.h>
27 #include <linux/swap.h>
28 #include <linux/proc_fs.h>
29 #include <linux/pfn.h>
30 #include <linux/hardirq.h>
32 #include <asm/asm-offsets.h>
33 #include <asm/bootinfo.h>
34 #include <asm/cachectl.h>
37 #include <asm/kmap_types.h>
38 #include <asm/mmu_context.h>
39 #include <asm/sections.h>
40 #include <asm/pgtable.h>
41 #include <asm/pgalloc.h>
43 #include <asm/fixmap.h>
45 /* Atomicity and interruptability */
46 #ifdef CONFIG_MIPS_MT_SMTC
48 #include <asm/mipsmtregs.h>
50 #define ENTER_CRITICAL(flags) \
52 unsigned int mvpflags; \
53 local_irq_save(flags);\
55 #define EXIT_CRITICAL(flags) \
57 local_irq_restore(flags); \
61 #define ENTER_CRITICAL(flags) local_irq_save(flags)
62 #define EXIT_CRITICAL(flags) local_irq_restore(flags)
64 #endif /* CONFIG_MIPS_MT_SMTC */
66 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
69 * We have up to 8 empty zeroed pages so we can map one of the right colour
70 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
71 * where we have to avoid VCED / VECI exceptions for good performance at
72 * any price. Since page is never written to after the initialization we
73 * don't have to care about aliases on other CPUs.
75 unsigned long empty_zero_page
, zero_page_mask
;
76 EXPORT_SYMBOL_GPL(empty_zero_page
);
79 * Not static inline because used by IP27 special magic initialization code
81 unsigned long setup_zero_pages(void)
92 empty_zero_page
= __get_free_pages(GFP_KERNEL
| __GFP_ZERO
, order
);
94 panic("Oh boy, that early out of memory?");
96 page
= virt_to_page((void *)empty_zero_page
);
97 split_page(page
, order
);
98 while (page
< virt_to_page((void *)(empty_zero_page
+ (PAGE_SIZE
<< order
)))) {
99 SetPageReserved(page
);
103 size
= PAGE_SIZE
<< order
;
104 zero_page_mask
= (size
- 1) & PAGE_MASK
;
109 #ifdef CONFIG_MIPS_MT_SMTC
110 static pte_t
*kmap_coherent_pte
;
111 static void __init
kmap_coherent_init(void)
115 /* cache the first coherent kmap pte */
116 vaddr
= __fix_to_virt(FIX_CMAP_BEGIN
);
117 kmap_coherent_pte
= kmap_get_fixmap_pte(vaddr
);
120 static inline void kmap_coherent_init(void) {}
123 void *kmap_coherent(struct page
*page
, unsigned long addr
)
125 enum fixed_addresses idx
;
126 unsigned long vaddr
, flags
, entrylo
;
127 unsigned long old_ctx
;
131 BUG_ON(Page_dcache_dirty(page
));
134 idx
= (addr
>> PAGE_SHIFT
) & (FIX_N_COLOURS
- 1);
135 #ifdef CONFIG_MIPS_MT_SMTC
136 idx
+= FIX_N_COLOURS
* smp_processor_id() +
137 (in_interrupt() ? (FIX_N_COLOURS
* NR_CPUS
) : 0);
139 idx
+= in_interrupt() ? FIX_N_COLOURS
: 0;
141 vaddr
= __fix_to_virt(FIX_CMAP_END
- idx
);
142 pte
= mk_pte(page
, PAGE_KERNEL
);
143 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
144 entrylo
= pte
.pte_high
;
146 entrylo
= pte_val(pte
) >> 6;
149 ENTER_CRITICAL(flags
);
150 old_ctx
= read_c0_entryhi();
151 write_c0_entryhi(vaddr
& (PAGE_MASK
<< 1));
152 write_c0_entrylo0(entrylo
);
153 write_c0_entrylo1(entrylo
);
154 #ifdef CONFIG_MIPS_MT_SMTC
155 set_pte(kmap_coherent_pte
- (FIX_CMAP_END
- idx
), pte
);
156 /* preload TLB instead of local_flush_tlb_one() */
160 tlbidx
= read_c0_index();
167 tlbidx
= read_c0_wired();
168 write_c0_wired(tlbidx
+ 1);
169 write_c0_index(tlbidx
);
174 write_c0_entryhi(old_ctx
);
175 EXIT_CRITICAL(flags
);
177 return (void*) vaddr
;
180 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
182 void kunmap_coherent(void)
184 #ifndef CONFIG_MIPS_MT_SMTC
186 unsigned long flags
, old_ctx
;
188 ENTER_CRITICAL(flags
);
189 old_ctx
= read_c0_entryhi();
190 wired
= read_c0_wired() - 1;
191 write_c0_wired(wired
);
192 write_c0_index(wired
);
193 write_c0_entryhi(UNIQUE_ENTRYHI(wired
));
194 write_c0_entrylo0(0);
195 write_c0_entrylo1(0);
199 write_c0_entryhi(old_ctx
);
200 EXIT_CRITICAL(flags
);
203 preempt_check_resched();
206 void copy_user_highpage(struct page
*to
, struct page
*from
,
207 unsigned long vaddr
, struct vm_area_struct
*vma
)
211 vto
= kmap_atomic(to
, KM_USER1
);
212 if (cpu_has_dc_aliases
&&
213 page_mapped(from
) && !Page_dcache_dirty(from
)) {
214 vfrom
= kmap_coherent(from
, vaddr
);
215 copy_page(vto
, vfrom
);
218 vfrom
= kmap_atomic(from
, KM_USER0
);
219 copy_page(vto
, vfrom
);
220 kunmap_atomic(vfrom
, KM_USER0
);
222 if ((!cpu_has_ic_fills_f_dc
) ||
223 pages_do_alias((unsigned long)vto
, vaddr
& PAGE_MASK
))
224 flush_data_cache_page((unsigned long)vto
);
225 kunmap_atomic(vto
, KM_USER1
);
226 /* Make sure this page is cleared on other CPU's too before using it */
230 void copy_to_user_page(struct vm_area_struct
*vma
,
231 struct page
*page
, unsigned long vaddr
, void *dst
, const void *src
,
234 if (cpu_has_dc_aliases
&&
235 page_mapped(page
) && !Page_dcache_dirty(page
)) {
236 void *vto
= kmap_coherent(page
, vaddr
) + (vaddr
& ~PAGE_MASK
);
237 memcpy(vto
, src
, len
);
240 memcpy(dst
, src
, len
);
241 if (cpu_has_dc_aliases
)
242 SetPageDcacheDirty(page
);
244 if ((vma
->vm_flags
& VM_EXEC
) && !cpu_has_ic_fills_f_dc
)
245 flush_cache_page(vma
, vaddr
, page_to_pfn(page
));
248 void copy_from_user_page(struct vm_area_struct
*vma
,
249 struct page
*page
, unsigned long vaddr
, void *dst
, const void *src
,
252 if (cpu_has_dc_aliases
&&
253 page_mapped(page
) && !Page_dcache_dirty(page
)) {
254 void *vfrom
= kmap_coherent(page
, vaddr
) + (vaddr
& ~PAGE_MASK
);
255 memcpy(dst
, vfrom
, len
);
258 memcpy(dst
, src
, len
);
259 if (cpu_has_dc_aliases
)
260 SetPageDcacheDirty(page
);
264 void __init
fixrange_init(unsigned long start
, unsigned long end
,
267 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
276 i
= __pgd_offset(vaddr
);
277 j
= __pud_offset(vaddr
);
278 k
= __pmd_offset(vaddr
);
281 for ( ; (i
< PTRS_PER_PGD
) && (vaddr
!= end
); pgd
++, i
++) {
283 for ( ; (j
< PTRS_PER_PUD
) && (vaddr
!= end
); pud
++, j
++) {
285 for (; (k
< PTRS_PER_PMD
) && (vaddr
!= end
); pmd
++, k
++) {
286 if (pmd_none(*pmd
)) {
287 pte
= (pte_t
*) alloc_bootmem_low_pages(PAGE_SIZE
);
288 set_pmd(pmd
, __pmd((unsigned long)pte
));
289 BUG_ON(pte
!= pte_offset_kernel(pmd
, 0));
300 #ifndef CONFIG_NEED_MULTIPLE_NODES
301 static int __init
page_is_ram(unsigned long pagenr
)
305 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
306 unsigned long addr
, end
;
308 if (boot_mem_map
.map
[i
].type
!= BOOT_MEM_RAM
)
309 /* not usable memory */
312 addr
= PFN_UP(boot_mem_map
.map
[i
].addr
);
313 end
= PFN_DOWN(boot_mem_map
.map
[i
].addr
+
314 boot_mem_map
.map
[i
].size
);
316 if (pagenr
>= addr
&& pagenr
< end
)
323 void __init
paging_init(void)
325 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
326 unsigned long lastpfn
;
330 #ifdef CONFIG_HIGHMEM
333 kmap_coherent_init();
335 #ifdef CONFIG_ZONE_DMA
336 max_zone_pfns
[ZONE_DMA
] = MAX_DMA_PFN
;
338 #ifdef CONFIG_ZONE_DMA32
339 max_zone_pfns
[ZONE_DMA32
] = MAX_DMA32_PFN
;
341 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
342 lastpfn
= max_low_pfn
;
343 #ifdef CONFIG_HIGHMEM
344 max_zone_pfns
[ZONE_HIGHMEM
] = highend_pfn
;
345 lastpfn
= highend_pfn
;
347 if (cpu_has_dc_aliases
&& max_low_pfn
!= highend_pfn
) {
348 printk(KERN_WARNING
"This processor doesn't support highmem."
349 " %ldk highmem ignored\n",
350 (highend_pfn
- max_low_pfn
) << (PAGE_SHIFT
- 10));
351 max_zone_pfns
[ZONE_HIGHMEM
] = max_low_pfn
;
352 lastpfn
= max_low_pfn
;
356 free_area_init_nodes(max_zone_pfns
);
360 static struct kcore_list kcore_kseg0
;
363 void __init
mem_init(void)
365 unsigned long codesize
, reservedpages
, datasize
, initsize
;
366 unsigned long tmp
, ram
;
368 #ifdef CONFIG_HIGHMEM
369 #ifdef CONFIG_DISCONTIGMEM
370 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
372 max_mapnr
= highend_pfn
;
374 max_mapnr
= max_low_pfn
;
376 high_memory
= (void *) __va(max_low_pfn
<< PAGE_SHIFT
);
378 totalram_pages
+= free_all_bootmem();
379 totalram_pages
-= setup_zero_pages(); /* Setup zeroed pages. */
381 reservedpages
= ram
= 0;
382 for (tmp
= 0; tmp
< max_low_pfn
; tmp
++)
383 if (page_is_ram(tmp
)) {
385 if (PageReserved(pfn_to_page(tmp
)))
390 #ifdef CONFIG_HIGHMEM
391 for (tmp
= highstart_pfn
; tmp
< highend_pfn
; tmp
++) {
392 struct page
*page
= pfn_to_page(tmp
);
394 if (!page_is_ram(tmp
)) {
395 SetPageReserved(page
);
398 ClearPageReserved(page
);
399 init_page_count(page
);
403 totalram_pages
+= totalhigh_pages
;
404 num_physpages
+= totalhigh_pages
;
407 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
408 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
409 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
412 if ((unsigned long) &_text
> (unsigned long) CKSEG0
)
413 /* The -4 is a hack so that user tools don't have to handle
415 kclist_add(&kcore_kseg0
, (void *) CKSEG0
,
416 0x80000000 - 4, KCORE_TEXT
);
419 printk(KERN_INFO
"Memory: %luk/%luk available (%ldk kernel code, "
420 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
421 nr_free_pages() << (PAGE_SHIFT
-10),
422 ram
<< (PAGE_SHIFT
-10),
424 reservedpages
<< (PAGE_SHIFT
-10),
427 (unsigned long) (totalhigh_pages
<< (PAGE_SHIFT
-10)));
429 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
431 void free_init_pages(const char *what
, unsigned long begin
, unsigned long end
)
435 for (pfn
= PFN_UP(begin
); pfn
< PFN_DOWN(end
); pfn
++) {
436 struct page
*page
= pfn_to_page(pfn
);
437 void *addr
= phys_to_virt(PFN_PHYS(pfn
));
439 ClearPageReserved(page
);
440 init_page_count(page
);
441 memset(addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
445 printk(KERN_INFO
"Freeing %s: %ldk freed\n", what
, (end
- begin
) >> 10);
448 #ifdef CONFIG_BLK_DEV_INITRD
449 void free_initrd_mem(unsigned long start
, unsigned long end
)
451 free_init_pages("initrd memory",
452 virt_to_phys((void *)start
),
453 virt_to_phys((void *)end
));
457 void __init_refok
free_initmem(void)
459 prom_free_prom_memory();
460 free_init_pages("unused kernel memory",
461 __pa_symbol(&__init_begin
),
462 __pa_symbol(&__init_end
));
465 unsigned long pgd_current
[NR_CPUS
];
467 * On 64-bit we've got three-level pagetables with a slightly
468 * different layout ...
470 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
473 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
474 * are constants. So we use the variants from asm-offset.h until that gcc
475 * will officially be retired.
477 pgd_t swapper_pg_dir
[_PTRS_PER_PGD
] __page_aligned(_PGD_ORDER
);
479 pmd_t invalid_pmd_table
[PTRS_PER_PMD
] __page_aligned(PMD_ORDER
);
481 pte_t invalid_pte_table
[PTRS_PER_PTE
] __page_aligned(PTE_ORDER
);