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>
31 #include <linux/gfp.h>
32 #include <linux/kcore.h>
34 #include <asm/asm-offsets.h>
35 #include <asm/bootinfo.h>
36 #include <asm/cachectl.h>
39 #include <asm/kmap_types.h>
41 #include <asm/mmu_context.h>
42 #include <asm/sections.h>
43 #include <asm/pgtable.h>
44 #include <asm/pgalloc.h>
46 #include <asm/fixmap.h>
50 * We have up to 8 empty zeroed pages so we can map one of the right colour
51 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
52 * where we have to avoid VCED / VECI exceptions for good performance at
53 * any price. Since page is never written to after the initialization we
54 * don't have to care about aliases on other CPUs.
56 unsigned long empty_zero_page
, zero_page_mask
;
57 EXPORT_SYMBOL_GPL(empty_zero_page
);
58 EXPORT_SYMBOL(zero_page_mask
);
61 * Not static inline because used by IP27 special magic initialization code
63 void setup_zero_pages(void)
65 unsigned int order
, i
;
73 empty_zero_page
= __get_free_pages(GFP_KERNEL
| __GFP_ZERO
, order
);
75 panic("Oh boy, that early out of memory?");
77 page
= virt_to_page((void *)empty_zero_page
);
78 split_page(page
, order
);
79 for (i
= 0; i
< (1 << order
); i
++, page
++)
80 mark_page_reserved(page
);
82 zero_page_mask
= ((PAGE_SIZE
<< order
) - 1) & PAGE_MASK
;
85 static void *__kmap_pgprot(struct page
*page
, unsigned long addr
, pgprot_t prot
)
87 enum fixed_addresses idx
;
88 unsigned long vaddr
, flags
, entrylo
;
89 unsigned long old_ctx
;
93 BUG_ON(Page_dcache_dirty(page
));
97 idx
= (addr
>> PAGE_SHIFT
) & (FIX_N_COLOURS
- 1);
98 idx
+= in_interrupt() ? FIX_N_COLOURS
: 0;
99 vaddr
= __fix_to_virt(FIX_CMAP_END
- idx
);
100 pte
= mk_pte(page
, prot
);
101 #if defined(CONFIG_XPA)
102 entrylo
= pte_to_entrylo(pte
.pte_high
);
103 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
104 entrylo
= pte
.pte_high
;
106 entrylo
= pte_to_entrylo(pte_val(pte
));
109 local_irq_save(flags
);
110 old_ctx
= read_c0_entryhi();
111 write_c0_entryhi(vaddr
& (PAGE_MASK
<< 1));
112 write_c0_entrylo0(entrylo
);
113 write_c0_entrylo1(entrylo
);
116 entrylo
= (pte
.pte_low
& _PFNX_MASK
);
117 writex_c0_entrylo0(entrylo
);
118 writex_c0_entrylo1(entrylo
);
121 tlbidx
= read_c0_wired();
122 write_c0_wired(tlbidx
+ 1);
123 write_c0_index(tlbidx
);
127 write_c0_entryhi(old_ctx
);
128 local_irq_restore(flags
);
130 return (void*) vaddr
;
133 void *kmap_coherent(struct page
*page
, unsigned long addr
)
135 return __kmap_pgprot(page
, addr
, PAGE_KERNEL
);
138 void *kmap_noncoherent(struct page
*page
, unsigned long addr
)
140 return __kmap_pgprot(page
, addr
, PAGE_KERNEL_NC
);
143 void kunmap_coherent(void)
146 unsigned long flags
, old_ctx
;
148 local_irq_save(flags
);
149 old_ctx
= read_c0_entryhi();
150 wired
= read_c0_wired() - 1;
151 write_c0_wired(wired
);
152 write_c0_index(wired
);
153 write_c0_entryhi(UNIQUE_ENTRYHI(wired
));
154 write_c0_entrylo0(0);
155 write_c0_entrylo1(0);
159 write_c0_entryhi(old_ctx
);
160 local_irq_restore(flags
);
165 void copy_user_highpage(struct page
*to
, struct page
*from
,
166 unsigned long vaddr
, struct vm_area_struct
*vma
)
170 vto
= kmap_atomic(to
);
171 if (cpu_has_dc_aliases
&&
172 page_mapcount(from
) && !Page_dcache_dirty(from
)) {
173 vfrom
= kmap_coherent(from
, vaddr
);
174 copy_page(vto
, vfrom
);
177 vfrom
= kmap_atomic(from
);
178 copy_page(vto
, vfrom
);
179 kunmap_atomic(vfrom
);
181 if ((!cpu_has_ic_fills_f_dc
) ||
182 pages_do_alias((unsigned long)vto
, vaddr
& PAGE_MASK
))
183 flush_data_cache_page((unsigned long)vto
);
185 /* Make sure this page is cleared on other CPU's too before using it */
189 void copy_to_user_page(struct vm_area_struct
*vma
,
190 struct page
*page
, unsigned long vaddr
, void *dst
, const void *src
,
193 if (cpu_has_dc_aliases
&&
194 page_mapcount(page
) && !Page_dcache_dirty(page
)) {
195 void *vto
= kmap_coherent(page
, vaddr
) + (vaddr
& ~PAGE_MASK
);
196 memcpy(vto
, src
, len
);
199 memcpy(dst
, src
, len
);
200 if (cpu_has_dc_aliases
)
201 SetPageDcacheDirty(page
);
203 if (vma
->vm_flags
& VM_EXEC
)
204 flush_cache_page(vma
, vaddr
, page_to_pfn(page
));
207 void copy_from_user_page(struct vm_area_struct
*vma
,
208 struct page
*page
, unsigned long vaddr
, void *dst
, const void *src
,
211 if (cpu_has_dc_aliases
&&
212 page_mapcount(page
) && !Page_dcache_dirty(page
)) {
213 void *vfrom
= kmap_coherent(page
, vaddr
) + (vaddr
& ~PAGE_MASK
);
214 memcpy(dst
, vfrom
, len
);
217 memcpy(dst
, src
, len
);
218 if (cpu_has_dc_aliases
)
219 SetPageDcacheDirty(page
);
222 EXPORT_SYMBOL_GPL(copy_from_user_page
);
224 void __init
fixrange_init(unsigned long start
, unsigned long end
,
227 #ifdef CONFIG_HIGHMEM
236 i
= __pgd_offset(vaddr
);
237 j
= __pud_offset(vaddr
);
238 k
= __pmd_offset(vaddr
);
241 for ( ; (i
< PTRS_PER_PGD
) && (vaddr
< end
); pgd
++, i
++) {
243 for ( ; (j
< PTRS_PER_PUD
) && (vaddr
< end
); pud
++, j
++) {
245 for (; (k
< PTRS_PER_PMD
) && (vaddr
< end
); pmd
++, k
++) {
246 if (pmd_none(*pmd
)) {
247 pte
= (pte_t
*) alloc_bootmem_low_pages(PAGE_SIZE
);
248 set_pmd(pmd
, __pmd((unsigned long)pte
));
249 BUG_ON(pte
!= pte_offset_kernel(pmd
, 0));
260 unsigned __weak
platform_maar_init(unsigned num_pairs
)
262 struct maar_config cfg
[BOOT_MEM_MAP_MAX
];
263 unsigned i
, num_configured
, num_cfg
= 0;
266 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
267 switch (boot_mem_map
.map
[i
].type
) {
269 case BOOT_MEM_INIT_RAM
:
275 skip
= 0x10000 - (boot_mem_map
.map
[i
].addr
& 0xffff);
277 cfg
[num_cfg
].lower
= boot_mem_map
.map
[i
].addr
;
278 cfg
[num_cfg
].lower
+= skip
;
280 cfg
[num_cfg
].upper
= cfg
[num_cfg
].lower
;
281 cfg
[num_cfg
].upper
+= boot_mem_map
.map
[i
].size
- 1;
282 cfg
[num_cfg
].upper
-= skip
;
284 cfg
[num_cfg
].attrs
= MIPS_MAAR_S
;
288 num_configured
= maar_config(cfg
, num_cfg
, num_pairs
);
289 if (num_configured
< num_cfg
)
290 pr_warn("Not enough MAAR pairs (%u) for all bootmem regions (%u)\n",
293 return num_configured
;
298 unsigned num_maars
, used
, i
;
299 phys_addr_t lower
, upper
, attr
;
301 struct maar_config cfgs
[3];
303 } recorded
= { { { 0 } }, 0 };
308 /* Detect the number of MAARs */
310 back_to_back_c0_hazard();
311 num_maars
= read_c0_maari() + 1;
313 /* MAARs should be in pairs */
314 WARN_ON(num_maars
% 2);
316 /* Set MAARs using values we recorded already */
318 used
= maar_config(recorded
.cfgs
, recorded
.used
, num_maars
/ 2);
319 BUG_ON(used
!= recorded
.used
);
321 /* Configure the required MAARs */
322 used
= platform_maar_init(num_maars
/ 2);
325 /* Disable any further MAARs */
326 for (i
= (used
* 2); i
< num_maars
; i
++) {
328 back_to_back_c0_hazard();
330 back_to_back_c0_hazard();
336 pr_info("MAAR configuration:\n");
337 for (i
= 0; i
< num_maars
; i
+= 2) {
339 back_to_back_c0_hazard();
340 upper
= read_c0_maar();
342 write_c0_maari(i
+ 1);
343 back_to_back_c0_hazard();
344 lower
= read_c0_maar();
346 attr
= lower
& upper
;
347 lower
= (lower
& MIPS_MAAR_ADDR
) << 4;
348 upper
= ((upper
& MIPS_MAAR_ADDR
) << 4) | 0xffff;
350 pr_info(" [%d]: ", i
/ 2);
351 if (!(attr
& MIPS_MAAR_V
)) {
352 pr_cont("disabled\n");
356 pr_cont("%pa-%pa", &lower
, &upper
);
358 if (attr
& MIPS_MAAR_S
)
359 pr_cont(" speculate");
363 /* Record the setup for use on secondary CPUs */
364 if (used
<= ARRAY_SIZE(recorded
.cfgs
)) {
365 recorded
.cfgs
[recorded
.used
].lower
= lower
;
366 recorded
.cfgs
[recorded
.used
].upper
= upper
;
367 recorded
.cfgs
[recorded
.used
].attrs
= attr
;
373 #ifndef CONFIG_NEED_MULTIPLE_NODES
374 int page_is_ram(unsigned long pagenr
)
378 for (i
= 0; i
< boot_mem_map
.nr_map
; i
++) {
379 unsigned long addr
, end
;
381 switch (boot_mem_map
.map
[i
].type
) {
383 case BOOT_MEM_INIT_RAM
:
386 /* not usable memory */
390 addr
= 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 (pagenr
>= addr
&& pagenr
< end
)
401 void __init
paging_init(void)
403 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
404 unsigned long lastpfn __maybe_unused
;
408 #ifdef CONFIG_HIGHMEM
411 #ifdef CONFIG_ZONE_DMA
412 max_zone_pfns
[ZONE_DMA
] = MAX_DMA_PFN
;
414 #ifdef CONFIG_ZONE_DMA32
415 max_zone_pfns
[ZONE_DMA32
] = MAX_DMA32_PFN
;
417 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
418 lastpfn
= max_low_pfn
;
419 #ifdef CONFIG_HIGHMEM
420 max_zone_pfns
[ZONE_HIGHMEM
] = highend_pfn
;
421 lastpfn
= highend_pfn
;
423 if (cpu_has_dc_aliases
&& max_low_pfn
!= highend_pfn
) {
424 printk(KERN_WARNING
"This processor doesn't support highmem."
425 " %ldk highmem ignored\n",
426 (highend_pfn
- max_low_pfn
) << (PAGE_SHIFT
- 10));
427 max_zone_pfns
[ZONE_HIGHMEM
] = max_low_pfn
;
428 lastpfn
= max_low_pfn
;
432 free_area_init_nodes(max_zone_pfns
);
436 static struct kcore_list kcore_kseg0
;
439 static inline void mem_init_free_highmem(void)
441 #ifdef CONFIG_HIGHMEM
444 for (tmp
= highstart_pfn
; tmp
< highend_pfn
; tmp
++) {
445 struct page
*page
= pfn_to_page(tmp
);
447 if (!page_is_ram(tmp
))
448 SetPageReserved(page
);
450 free_highmem_page(page
);
455 void __init
mem_init(void)
457 #ifdef CONFIG_HIGHMEM
458 #ifdef CONFIG_DISCONTIGMEM
459 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
461 max_mapnr
= highend_pfn
? highend_pfn
: max_low_pfn
;
463 max_mapnr
= max_low_pfn
;
465 high_memory
= (void *) __va(max_low_pfn
<< PAGE_SHIFT
);
469 setup_zero_pages(); /* Setup zeroed pages. */
470 mem_init_free_highmem();
471 mem_init_print_info(NULL
);
474 if ((unsigned long) &_text
> (unsigned long) CKSEG0
)
475 /* The -4 is a hack so that user tools don't have to handle
477 kclist_add(&kcore_kseg0
, (void *) CKSEG0
,
478 0x80000000 - 4, KCORE_TEXT
);
481 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
483 void free_init_pages(const char *what
, unsigned long begin
, unsigned long end
)
487 for (pfn
= PFN_UP(begin
); pfn
< PFN_DOWN(end
); pfn
++) {
488 struct page
*page
= pfn_to_page(pfn
);
489 void *addr
= phys_to_virt(PFN_PHYS(pfn
));
491 memset(addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
492 free_reserved_page(page
);
494 printk(KERN_INFO
"Freeing %s: %ldk freed\n", what
, (end
- begin
) >> 10);
497 #ifdef CONFIG_BLK_DEV_INITRD
498 void free_initrd_mem(unsigned long start
, unsigned long end
)
500 free_reserved_area((void *)start
, (void *)end
, POISON_FREE_INITMEM
,
505 void (*free_init_pages_eva
)(void *begin
, void *end
) = NULL
;
507 void __init_refok
free_initmem(void)
509 prom_free_prom_memory();
511 * Let the platform define a specific function to free the
512 * init section since EVA may have used any possible mapping
513 * between virtual and physical addresses.
515 if (free_init_pages_eva
)
516 free_init_pages_eva((void *)&__init_begin
, (void *)&__init_end
);
518 free_initmem_default(POISON_FREE_INITMEM
);
521 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
522 unsigned long pgd_current
[NR_CPUS
];
526 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
527 * are constants. So we use the variants from asm-offset.h until that gcc
528 * will officially be retired.
530 * Align swapper_pg_dir in to 64K, allows its address to be loaded
531 * with a single LUI instruction in the TLB handlers. If we used
532 * __aligned(64K), its size would get rounded up to the alignment
533 * size, and waste space. So we place it in its own section and align
534 * it in the linker script.
536 pgd_t swapper_pg_dir
[_PTRS_PER_PGD
] __section(.bss
..swapper_pg_dir
);
537 #ifndef __PAGETABLE_PMD_FOLDED
538 pmd_t invalid_pmd_table
[PTRS_PER_PMD
] __page_aligned_bss
;
540 pte_t invalid_pte_table
[PTRS_PER_PTE
] __page_aligned_bss
;
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