1
2
3
4
5
6
7
8
9
10
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>
24#include <linux/mm.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
33#include <asm/asm-offsets.h>
34#include <asm/bootinfo.h>
35#include <asm/cachectl.h>
36#include <asm/cpu.h>
37#include <asm/dma.h>
38#include <asm/kmap_types.h>
39#include <asm/mmu_context.h>
40#include <asm/sections.h>
41#include <asm/pgtable.h>
42#include <asm/pgalloc.h>
43#include <asm/tlb.h>
44#include <asm/fixmap.h>
45
46
47#ifdef CONFIG_MIPS_MT_SMTC
48
49#include <asm/mipsmtregs.h>
50
51#define ENTER_CRITICAL(flags) \
52 { \
53 unsigned int mvpflags; \
54 local_irq_save(flags);\
55 mvpflags = dvpe()
56#define EXIT_CRITICAL(flags) \
57 evpe(mvpflags); \
58 local_irq_restore(flags); \
59 }
60#else
61
62#define ENTER_CRITICAL(flags) local_irq_save(flags)
63#define EXIT_CRITICAL(flags) local_irq_restore(flags)
64
65#endif
66
67DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
68
69
70
71
72
73
74
75
76unsigned long empty_zero_page, zero_page_mask;
77EXPORT_SYMBOL_GPL(empty_zero_page);
78
79
80
81
82unsigned long setup_zero_pages(void)
83{
84 unsigned int order;
85 unsigned long size;
86 struct page *page;
87
88 if (cpu_has_vce)
89 order = 3;
90 else
91 order = 0;
92
93 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
94 if (!empty_zero_page)
95 panic("Oh boy, that early out of memory?");
96
97 page = virt_to_page((void *)empty_zero_page);
98 split_page(page, order);
99 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
100 SetPageReserved(page);
101 page++;
102 }
103
104 size = PAGE_SIZE << order;
105 zero_page_mask = (size - 1) & PAGE_MASK;
106
107 return 1UL << order;
108}
109
110#ifdef CONFIG_MIPS_MT_SMTC
111static pte_t *kmap_coherent_pte;
112static void __init kmap_coherent_init(void)
113{
114 unsigned long vaddr;
115
116
117 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
118 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
119}
120#else
121static inline void kmap_coherent_init(void) {}
122#endif
123
124void *kmap_coherent(struct page *page, unsigned long addr)
125{
126 enum fixed_addresses idx;
127 unsigned long vaddr, flags, entrylo;
128 unsigned long old_ctx;
129 pte_t pte;
130 int tlbidx;
131
132 BUG_ON(Page_dcache_dirty(page));
133
134 inc_preempt_count();
135 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
136#ifdef CONFIG_MIPS_MT_SMTC
137 idx += FIX_N_COLOURS * smp_processor_id() +
138 (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
139#else
140 idx += in_interrupt() ? FIX_N_COLOURS : 0;
141#endif
142 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
143 pte = mk_pte(page, PAGE_KERNEL);
144#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
145 entrylo = pte.pte_high;
146#else
147 entrylo = pte_to_entrylo(pte_val(pte));
148#endif
149
150 ENTER_CRITICAL(flags);
151 old_ctx = read_c0_entryhi();
152 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
153 write_c0_entrylo0(entrylo);
154 write_c0_entrylo1(entrylo);
155#ifdef CONFIG_MIPS_MT_SMTC
156 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
157
158 mtc0_tlbw_hazard();
159 tlb_probe();
160 tlb_probe_hazard();
161 tlbidx = read_c0_index();
162 mtc0_tlbw_hazard();
163 if (tlbidx < 0)
164 tlb_write_random();
165 else
166 tlb_write_indexed();
167#else
168 tlbidx = read_c0_wired();
169 write_c0_wired(tlbidx + 1);
170 write_c0_index(tlbidx);
171 mtc0_tlbw_hazard();
172 tlb_write_indexed();
173#endif
174 tlbw_use_hazard();
175 write_c0_entryhi(old_ctx);
176 EXIT_CRITICAL(flags);
177
178 return (void*) vaddr;
179}
180
181#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
182
183void kunmap_coherent(void)
184{
185#ifndef CONFIG_MIPS_MT_SMTC
186 unsigned int wired;
187 unsigned long flags, old_ctx;
188
189 ENTER_CRITICAL(flags);
190 old_ctx = read_c0_entryhi();
191 wired = read_c0_wired() - 1;
192 write_c0_wired(wired);
193 write_c0_index(wired);
194 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
195 write_c0_entrylo0(0);
196 write_c0_entrylo1(0);
197 mtc0_tlbw_hazard();
198 tlb_write_indexed();
199 tlbw_use_hazard();
200 write_c0_entryhi(old_ctx);
201 EXIT_CRITICAL(flags);
202#endif
203 dec_preempt_count();
204 preempt_check_resched();
205}
206
207void copy_user_highpage(struct page *to, struct page *from,
208 unsigned long vaddr, struct vm_area_struct *vma)
209{
210 void *vfrom, *vto;
211
212 vto = kmap_atomic(to, KM_USER1);
213 if (cpu_has_dc_aliases &&
214 page_mapped(from) && !Page_dcache_dirty(from)) {
215 vfrom = kmap_coherent(from, vaddr);
216 copy_page(vto, vfrom);
217 kunmap_coherent();
218 } else {
219 vfrom = kmap_atomic(from, KM_USER0);
220 copy_page(vto, vfrom);
221 kunmap_atomic(vfrom, KM_USER0);
222 }
223 if ((!cpu_has_ic_fills_f_dc) ||
224 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
225 flush_data_cache_page((unsigned long)vto);
226 kunmap_atomic(vto, KM_USER1);
227
228 smp_wmb();
229}
230
231void copy_to_user_page(struct vm_area_struct *vma,
232 struct page *page, unsigned long vaddr, void *dst, const void *src,
233 unsigned long len)
234{
235 if (cpu_has_dc_aliases &&
236 page_mapped(page) && !Page_dcache_dirty(page)) {
237 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
238 memcpy(vto, src, len);
239 kunmap_coherent();
240 } else {
241 memcpy(dst, src, len);
242 if (cpu_has_dc_aliases)
243 SetPageDcacheDirty(page);
244 }
245 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
246 flush_cache_page(vma, vaddr, page_to_pfn(page));
247}
248
249void copy_from_user_page(struct vm_area_struct *vma,
250 struct page *page, unsigned long vaddr, void *dst, const void *src,
251 unsigned long len)
252{
253 if (cpu_has_dc_aliases &&
254 page_mapped(page) && !Page_dcache_dirty(page)) {
255 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
256 memcpy(dst, vfrom, len);
257 kunmap_coherent();
258 } else {
259 memcpy(dst, src, len);
260 if (cpu_has_dc_aliases)
261 SetPageDcacheDirty(page);
262 }
263}
264
265void __init fixrange_init(unsigned long start, unsigned long end,
266 pgd_t *pgd_base)
267{
268#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
269 pgd_t *pgd;
270 pud_t *pud;
271 pmd_t *pmd;
272 pte_t *pte;
273 int i, j, k;
274 unsigned long vaddr;
275
276 vaddr = start;
277 i = __pgd_offset(vaddr);
278 j = __pud_offset(vaddr);
279 k = __pmd_offset(vaddr);
280 pgd = pgd_base + i;
281
282 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
283 pud = (pud_t *)pgd;
284 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
285 pmd = (pmd_t *)pud;
286 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
287 if (pmd_none(*pmd)) {
288 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
289 set_pmd(pmd, __pmd((unsigned long)pte));
290 BUG_ON(pte != pte_offset_kernel(pmd, 0));
291 }
292 vaddr += PMD_SIZE;
293 }
294 k = 0;
295 }
296 j = 0;
297 }
298#endif
299}
300
301#ifndef CONFIG_NEED_MULTIPLE_NODES
302int page_is_ram(unsigned long pagenr)
303{
304 int i;
305
306 for (i = 0; i < boot_mem_map.nr_map; i++) {
307 unsigned long addr, end;
308
309 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
310
311 continue;
312
313 addr = PFN_UP(boot_mem_map.map[i].addr);
314 end = PFN_DOWN(boot_mem_map.map[i].addr +
315 boot_mem_map.map[i].size);
316
317 if (pagenr >= addr && pagenr < end)
318 return 1;
319 }
320
321 return 0;
322}
323
324void __init paging_init(void)
325{
326 unsigned long max_zone_pfns[MAX_NR_ZONES];
327 unsigned long lastpfn __maybe_unused;
328
329 pagetable_init();
330
331#ifdef CONFIG_HIGHMEM
332 kmap_init();
333#endif
334 kmap_coherent_init();
335
336#ifdef CONFIG_ZONE_DMA
337 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
338#endif
339#ifdef CONFIG_ZONE_DMA32
340 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
341#endif
342 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
343 lastpfn = max_low_pfn;
344#ifdef CONFIG_HIGHMEM
345 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
346 lastpfn = highend_pfn;
347
348 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
349 printk(KERN_WARNING "This processor doesn't support highmem."
350 " %ldk highmem ignored\n",
351 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
352 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
353 lastpfn = max_low_pfn;
354 }
355#endif
356
357 free_area_init_nodes(max_zone_pfns);
358}
359
360#ifdef CONFIG_64BIT
361static struct kcore_list kcore_kseg0;
362#endif
363
364void __init mem_init(void)
365{
366 unsigned long codesize, reservedpages, datasize, initsize;
367 unsigned long tmp, ram;
368
369#ifdef CONFIG_HIGHMEM
370#ifdef CONFIG_DISCONTIGMEM
371#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
372#endif
373 max_mapnr = highend_pfn;
374#else
375 max_mapnr = max_low_pfn;
376#endif
377 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
378
379 totalram_pages += free_all_bootmem();
380 totalram_pages -= setup_zero_pages();
381
382 reservedpages = ram = 0;
383 for (tmp = 0; tmp < max_low_pfn; tmp++)
384 if (page_is_ram(tmp)) {
385 ram++;
386 if (PageReserved(pfn_to_page(tmp)))
387 reservedpages++;
388 }
389 num_physpages = ram;
390
391#ifdef CONFIG_HIGHMEM
392 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
393 struct page *page = pfn_to_page(tmp);
394
395 if (!page_is_ram(tmp)) {
396 SetPageReserved(page);
397 continue;
398 }
399 ClearPageReserved(page);
400 init_page_count(page);
401 __free_page(page);
402 totalhigh_pages++;
403 }
404 totalram_pages += totalhigh_pages;
405 num_physpages += totalhigh_pages;
406#endif
407
408 codesize = (unsigned long) &_etext - (unsigned long) &_text;
409 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
410 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
411
412#ifdef CONFIG_64BIT
413 if ((unsigned long) &_text > (unsigned long) CKSEG0)
414
415
416 kclist_add(&kcore_kseg0, (void *) CKSEG0,
417 0x80000000 - 4, KCORE_TEXT);
418#endif
419
420 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
421 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
422 nr_free_pages() << (PAGE_SHIFT-10),
423 ram << (PAGE_SHIFT-10),
424 codesize >> 10,
425 reservedpages << (PAGE_SHIFT-10),
426 datasize >> 10,
427 initsize >> 10,
428 totalhigh_pages << (PAGE_SHIFT-10));
429}
430#endif
431
432void free_init_pages(const char *what, unsigned long begin, unsigned long end)
433{
434 unsigned long pfn;
435
436 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
437 struct page *page = pfn_to_page(pfn);
438 void *addr = phys_to_virt(PFN_PHYS(pfn));
439
440 ClearPageReserved(page);
441 init_page_count(page);
442 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
443 __free_page(page);
444 totalram_pages++;
445 }
446 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
447}
448
449#ifdef CONFIG_BLK_DEV_INITRD
450void free_initrd_mem(unsigned long start, unsigned long end)
451{
452 free_init_pages("initrd memory",
453 virt_to_phys((void *)start),
454 virt_to_phys((void *)end));
455}
456#endif
457
458void __init_refok free_initmem(void)
459{
460 prom_free_prom_memory();
461 free_init_pages("unused kernel memory",
462 __pa_symbol(&__init_begin),
463 __pa_symbol(&__init_end));
464}
465
466#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
467unsigned long pgd_current[NR_CPUS];
468#endif
469
470
471
472
473#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
474
475
476
477
478
479
480pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
481#ifndef __PAGETABLE_PMD_FOLDED
482pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
483#endif
484pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
485
