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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
67
68
69
70
71
72
73
74unsigned long empty_zero_page, zero_page_mask;
75EXPORT_SYMBOL_GPL(empty_zero_page);
76
77
78
79
80unsigned long setup_zero_pages(void)
81{
82 unsigned int order;
83 unsigned long size;
84 struct page *page;
85
86 if (cpu_has_vce)
87 order = 3;
88 else
89 order = 0;
90
91 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
92 if (!empty_zero_page)
93 panic("Oh boy, that early out of memory?");
94
95 page = virt_to_page((void *)empty_zero_page);
96 split_page(page, order);
97 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
98 SetPageReserved(page);
99 page++;
100 }
101
102 size = PAGE_SIZE << order;
103 zero_page_mask = (size - 1) & PAGE_MASK;
104
105 return 1UL << order;
106}
107
108#ifdef CONFIG_MIPS_MT_SMTC
109static pte_t *kmap_coherent_pte;
110static void __init kmap_coherent_init(void)
111{
112 unsigned long vaddr;
113
114
115 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
116 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
117}
118#else
119static inline void kmap_coherent_init(void) {}
120#endif
121
122void *kmap_coherent(struct page *page, unsigned long addr)
123{
124 enum fixed_addresses idx;
125 unsigned long vaddr, flags, entrylo;
126 unsigned long old_ctx;
127 pte_t pte;
128 int tlbidx;
129
130 BUG_ON(Page_dcache_dirty(page));
131
132 inc_preempt_count();
133 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
134#ifdef CONFIG_MIPS_MT_SMTC
135 idx += FIX_N_COLOURS * smp_processor_id() +
136 (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
137#else
138 idx += in_interrupt() ? FIX_N_COLOURS : 0;
139#endif
140 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
141 pte = mk_pte(page, PAGE_KERNEL);
142#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
143 entrylo = pte.pte_high;
144#else
145 entrylo = pte_to_entrylo(pte_val(pte));
146#endif
147
148 ENTER_CRITICAL(flags);
149 old_ctx = read_c0_entryhi();
150 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
151 write_c0_entrylo0(entrylo);
152 write_c0_entrylo1(entrylo);
153#ifdef CONFIG_MIPS_MT_SMTC
154 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
155
156 mtc0_tlbw_hazard();
157 tlb_probe();
158 tlb_probe_hazard();
159 tlbidx = read_c0_index();
160 mtc0_tlbw_hazard();
161 if (tlbidx < 0)
162 tlb_write_random();
163 else
164 tlb_write_indexed();
165#else
166 tlbidx = read_c0_wired();
167 write_c0_wired(tlbidx + 1);
168 write_c0_index(tlbidx);
169 mtc0_tlbw_hazard();
170 tlb_write_indexed();
171#endif
172 tlbw_use_hazard();
173 write_c0_entryhi(old_ctx);
174 EXIT_CRITICAL(flags);
175
176 return (void*) vaddr;
177}
178
179#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
180
181void kunmap_coherent(void)
182{
183#ifndef CONFIG_MIPS_MT_SMTC
184 unsigned int wired;
185 unsigned long flags, old_ctx;
186
187 ENTER_CRITICAL(flags);
188 old_ctx = read_c0_entryhi();
189 wired = read_c0_wired() - 1;
190 write_c0_wired(wired);
191 write_c0_index(wired);
192 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
193 write_c0_entrylo0(0);
194 write_c0_entrylo1(0);
195 mtc0_tlbw_hazard();
196 tlb_write_indexed();
197 tlbw_use_hazard();
198 write_c0_entryhi(old_ctx);
199 EXIT_CRITICAL(flags);
200#endif
201 dec_preempt_count();
202 preempt_check_resched();
203}
204
205void copy_user_highpage(struct page *to, struct page *from,
206 unsigned long vaddr, struct vm_area_struct *vma)
207{
208 void *vfrom, *vto;
209
210 vto = kmap_atomic(to);
211 if (cpu_has_dc_aliases &&
212 page_mapped(from) && !Page_dcache_dirty(from)) {
213 vfrom = kmap_coherent(from, vaddr);
214 copy_page(vto, vfrom);
215 kunmap_coherent();
216 } else {
217 vfrom = kmap_atomic(from);
218 copy_page(vto, vfrom);
219 kunmap_atomic(vfrom);
220 }
221 if ((!cpu_has_ic_fills_f_dc) ||
222 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
223 flush_data_cache_page((unsigned long)vto);
224 kunmap_atomic(vto);
225
226 smp_wmb();
227}
228
229void copy_to_user_page(struct vm_area_struct *vma,
230 struct page *page, unsigned long vaddr, void *dst, const void *src,
231 unsigned long len)
232{
233 if (cpu_has_dc_aliases &&
234 page_mapped(page) && !Page_dcache_dirty(page)) {
235 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
236 memcpy(vto, src, len);
237 kunmap_coherent();
238 } else {
239 memcpy(dst, src, len);
240 if (cpu_has_dc_aliases)
241 SetPageDcacheDirty(page);
242 }
243 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
244 flush_cache_page(vma, vaddr, page_to_pfn(page));
245}
246
247void copy_from_user_page(struct vm_area_struct *vma,
248 struct page *page, unsigned long vaddr, void *dst, const void *src,
249 unsigned long len)
250{
251 if (cpu_has_dc_aliases &&
252 page_mapped(page) && !Page_dcache_dirty(page)) {
253 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
254 memcpy(dst, vfrom, len);
255 kunmap_coherent();
256 } else {
257 memcpy(dst, src, len);
258 if (cpu_has_dc_aliases)
259 SetPageDcacheDirty(page);
260 }
261}
262
263void __init fixrange_init(unsigned long start, unsigned long end,
264 pgd_t *pgd_base)
265{
266#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
267 pgd_t *pgd;
268 pud_t *pud;
269 pmd_t *pmd;
270 pte_t *pte;
271 int i, j, k;
272 unsigned long vaddr;
273
274 vaddr = start;
275 i = __pgd_offset(vaddr);
276 j = __pud_offset(vaddr);
277 k = __pmd_offset(vaddr);
278 pgd = pgd_base + i;
279
280 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
281 pud = (pud_t *)pgd;
282 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
283 pmd = (pmd_t *)pud;
284 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
285 if (pmd_none(*pmd)) {
286 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
287 set_pmd(pmd, __pmd((unsigned long)pte));
288 BUG_ON(pte != pte_offset_kernel(pmd, 0));
289 }
290 vaddr += PMD_SIZE;
291 }
292 k = 0;
293 }
294 j = 0;
295 }
296#endif
297}
298
299#ifndef CONFIG_NEED_MULTIPLE_NODES
300int page_is_ram(unsigned long pagenr)
301{
302 int i;
303
304 for (i = 0; i < boot_mem_map.nr_map; i++) {
305 unsigned long addr, end;
306
307 switch (boot_mem_map.map[i].type) {
308 case BOOT_MEM_RAM:
309 case BOOT_MEM_INIT_RAM:
310 break;
311 default:
312
313 continue;
314 }
315
316 addr = PFN_UP(boot_mem_map.map[i].addr);
317 end = PFN_DOWN(boot_mem_map.map[i].addr +
318 boot_mem_map.map[i].size);
319
320 if (pagenr >= addr && pagenr < end)
321 return 1;
322 }
323
324 return 0;
325}
326
327void __init paging_init(void)
328{
329 unsigned long max_zone_pfns[MAX_NR_ZONES];
330 unsigned long lastpfn __maybe_unused;
331
332 pagetable_init();
333
334#ifdef CONFIG_HIGHMEM
335 kmap_init();
336#endif
337 kmap_coherent_init();
338
339#ifdef CONFIG_ZONE_DMA
340 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
341#endif
342#ifdef CONFIG_ZONE_DMA32
343 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
344#endif
345 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
346 lastpfn = max_low_pfn;
347#ifdef CONFIG_HIGHMEM
348 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
349 lastpfn = highend_pfn;
350
351 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
352 printk(KERN_WARNING "This processor doesn't support highmem."
353 " %ldk highmem ignored\n",
354 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
355 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
356 lastpfn = max_low_pfn;
357 }
358#endif
359
360 free_area_init_nodes(max_zone_pfns);
361}
362
363#ifdef CONFIG_64BIT
364static struct kcore_list kcore_kseg0;
365#endif
366
367void __init mem_init(void)
368{
369 unsigned long codesize, reservedpages, datasize, initsize;
370 unsigned long tmp, ram;
371
372#ifdef CONFIG_HIGHMEM
373#ifdef CONFIG_DISCONTIGMEM
374#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
375#endif
376 max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
377#else
378 max_mapnr = max_low_pfn;
379#endif
380 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
381
382 totalram_pages += free_all_bootmem();
383 totalram_pages -= setup_zero_pages();
384
385 reservedpages = ram = 0;
386 for (tmp = 0; tmp < max_low_pfn; tmp++)
387 if (page_is_ram(tmp) && pfn_valid(tmp)) {
388 ram++;
389 if (PageReserved(pfn_to_page(tmp)))
390 reservedpages++;
391 }
392 num_physpages = ram;
393
394#ifdef CONFIG_HIGHMEM
395 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
396 struct page *page = pfn_to_page(tmp);
397
398 if (!page_is_ram(tmp)) {
399 SetPageReserved(page);
400 continue;
401 }
402 ClearPageReserved(page);
403 init_page_count(page);
404 __free_page(page);
405 totalhigh_pages++;
406 }
407 totalram_pages += totalhigh_pages;
408 num_physpages += totalhigh_pages;
409#endif
410
411 codesize = (unsigned long) &_etext - (unsigned long) &_text;
412 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
413 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
414
415#ifdef CONFIG_64BIT
416 if ((unsigned long) &_text > (unsigned long) CKSEG0)
417
418
419 kclist_add(&kcore_kseg0, (void *) CKSEG0,
420 0x80000000 - 4, KCORE_TEXT);
421#endif
422
423 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
424 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
425 nr_free_pages() << (PAGE_SHIFT-10),
426 ram << (PAGE_SHIFT-10),
427 codesize >> 10,
428 reservedpages << (PAGE_SHIFT-10),
429 datasize >> 10,
430 initsize >> 10,
431 totalhigh_pages << (PAGE_SHIFT-10));
432}
433#endif
434
435void free_init_pages(const char *what, unsigned long begin, unsigned long end)
436{
437 unsigned long pfn;
438
439 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
440 struct page *page = pfn_to_page(pfn);
441 void *addr = phys_to_virt(PFN_PHYS(pfn));
442
443 ClearPageReserved(page);
444 init_page_count(page);
445 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
446 __free_page(page);
447 totalram_pages++;
448 }
449 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
450}
451
452#ifdef CONFIG_BLK_DEV_INITRD
453void free_initrd_mem(unsigned long start, unsigned long end)
454{
455 free_init_pages("initrd memory",
456 virt_to_phys((void *)start),
457 virt_to_phys((void *)end));
458}
459#endif
460
461void __init_refok free_initmem(void)
462{
463 prom_free_prom_memory();
464 free_init_pages("unused kernel memory",
465 __pa_symbol(&__init_begin),
466 __pa_symbol(&__init_end));
467}
468
469#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
470unsigned long pgd_current[NR_CPUS];
471#endif
472
473
474
475
476#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
477
478
479
480
481
482
483pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
484#ifndef __PAGETABLE_PMD_FOLDED
485pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
486#endif
487pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
488
