[ARM] pxa: fix incorrect CONFIG_CPU_PXA27x to CONFIG_PXA27x
[linux-2.6.git] / arch / sh / mm / init.c
1 /*
2  * linux/arch/sh/mm/init.c
3  *
4  *  Copyright (C) 1999  Niibe Yutaka
5  *  Copyright (C) 2002 - 2010  Paul Mundt
6  *
7  *  Based on linux/arch/i386/mm/init.c:
8  *   Copyright (C) 1995  Linus Torvalds
9  */
10 #include <linux/mm.h>
11 #include <linux/swap.h>
12 #include <linux/init.h>
13 #include <linux/gfp.h>
14 #include <linux/bootmem.h>
15 #include <linux/proc_fs.h>
16 #include <linux/pagemap.h>
17 #include <linux/percpu.h>
18 #include <linux/io.h>
19 #include <linux/lmb.h>
20 #include <linux/dma-mapping.h>
21 #include <asm/mmu_context.h>
22 #include <asm/mmzone.h>
23 #include <asm/kexec.h>
24 #include <asm/tlb.h>
25 #include <asm/cacheflush.h>
26 #include <asm/sections.h>
27 #include <asm/setup.h>
28 #include <asm/cache.h>
29 #include <asm/sizes.h>
30
31 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
32 pgd_t swapper_pg_dir[PTRS_PER_PGD];
33
34 void __init generic_mem_init(void)
35 {
36         lmb_add(__MEMORY_START, __MEMORY_SIZE);
37 }
38
39 void __init __weak plat_mem_setup(void)
40 {
41         /* Nothing to see here, move along. */
42 }
43
44 #ifdef CONFIG_MMU
45 static pte_t *__get_pte_phys(unsigned long addr)
46 {
47         pgd_t *pgd;
48         pud_t *pud;
49         pmd_t *pmd;
50         pte_t *pte;
51
52         pgd = pgd_offset_k(addr);
53         if (pgd_none(*pgd)) {
54                 pgd_ERROR(*pgd);
55                 return NULL;
56         }
57
58         pud = pud_alloc(NULL, pgd, addr);
59         if (unlikely(!pud)) {
60                 pud_ERROR(*pud);
61                 return NULL;
62         }
63
64         pmd = pmd_alloc(NULL, pud, addr);
65         if (unlikely(!pmd)) {
66                 pmd_ERROR(*pmd);
67                 return NULL;
68         }
69
70         pte = pte_offset_kernel(pmd, addr);
71         return pte;
72 }
73
74 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
75 {
76         pte_t *pte;
77
78         pte = __get_pte_phys(addr);
79         if (!pte_none(*pte)) {
80                 pte_ERROR(*pte);
81                 return;
82         }
83
84         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
85         local_flush_tlb_one(get_asid(), addr);
86
87         if (pgprot_val(prot) & _PAGE_WIRED)
88                 tlb_wire_entry(NULL, addr, *pte);
89 }
90
91 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
92 {
93         pte_t *pte;
94
95         pte = __get_pte_phys(addr);
96
97         if (pgprot_val(prot) & _PAGE_WIRED)
98                 tlb_unwire_entry();
99
100         set_pte(pte, pfn_pte(0, __pgprot(0)));
101         local_flush_tlb_one(get_asid(), addr);
102 }
103
104 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
105 {
106         unsigned long address = __fix_to_virt(idx);
107
108         if (idx >= __end_of_fixed_addresses) {
109                 BUG();
110                 return;
111         }
112
113         set_pte_phys(address, phys, prot);
114 }
115
116 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
117 {
118         unsigned long address = __fix_to_virt(idx);
119
120         if (idx >= __end_of_fixed_addresses) {
121                 BUG();
122                 return;
123         }
124
125         clear_pte_phys(address, prot);
126 }
127
128 void __init page_table_range_init(unsigned long start, unsigned long end,
129                                          pgd_t *pgd_base)
130 {
131         pgd_t *pgd;
132         pud_t *pud;
133         pmd_t *pmd;
134         pte_t *pte;
135         int i, j, k;
136         unsigned long vaddr;
137
138         vaddr = start;
139         i = __pgd_offset(vaddr);
140         j = __pud_offset(vaddr);
141         k = __pmd_offset(vaddr);
142         pgd = pgd_base + i;
143
144         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
145                 pud = (pud_t *)pgd;
146                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
147 #ifdef __PAGETABLE_PMD_FOLDED
148                         pmd = (pmd_t *)pud;
149 #else
150                         pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
151                         pud_populate(&init_mm, pud, pmd);
152                         pmd += k;
153 #endif
154                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
155                                 if (pmd_none(*pmd)) {
156                                         pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
157                                         pmd_populate_kernel(&init_mm, pmd, pte);
158                                         BUG_ON(pte != pte_offset_kernel(pmd, 0));
159                                 }
160                                 vaddr += PMD_SIZE;
161                         }
162                         k = 0;
163                 }
164                 j = 0;
165         }
166 }
167 #endif  /* CONFIG_MMU */
168
169 void __init allocate_pgdat(unsigned int nid)
170 {
171         unsigned long start_pfn, end_pfn;
172 #ifdef CONFIG_NEED_MULTIPLE_NODES
173         unsigned long phys;
174 #endif
175
176         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
177
178 #ifdef CONFIG_NEED_MULTIPLE_NODES
179         phys = __lmb_alloc_base(sizeof(struct pglist_data),
180                                 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
181         /* Retry with all of system memory */
182         if (!phys)
183                 phys = __lmb_alloc_base(sizeof(struct pglist_data),
184                                         SMP_CACHE_BYTES, lmb_end_of_DRAM());
185         if (!phys)
186                 panic("Can't allocate pgdat for node %d\n", nid);
187
188         NODE_DATA(nid) = __va(phys);
189         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
190
191         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
192 #endif
193
194         NODE_DATA(nid)->node_start_pfn = start_pfn;
195         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
196 }
197
198 static void __init bootmem_init_one_node(unsigned int nid)
199 {
200         unsigned long total_pages, paddr;
201         unsigned long end_pfn;
202         struct pglist_data *p;
203         int i;
204
205         p = NODE_DATA(nid);
206
207         /* Nothing to do.. */
208         if (!p->node_spanned_pages)
209                 return;
210
211         end_pfn = p->node_start_pfn + p->node_spanned_pages;
212
213         total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
214
215         paddr = lmb_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
216         if (!paddr)
217                 panic("Can't allocate bootmap for nid[%d]\n", nid);
218
219         init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
220
221         free_bootmem_with_active_regions(nid, end_pfn);
222
223         /*
224          * XXX Handle initial reservations for the system memory node
225          * only for the moment, we'll refactor this later for handling
226          * reservations in other nodes.
227          */
228         if (nid == 0) {
229                 /* Reserve the sections we're already using. */
230                 for (i = 0; i < lmb.reserved.cnt; i++)
231                         reserve_bootmem(lmb.reserved.region[i].base,
232                                         lmb_size_bytes(&lmb.reserved, i),
233                                         BOOTMEM_DEFAULT);
234         }
235
236         sparse_memory_present_with_active_regions(nid);
237 }
238
239 static void __init do_init_bootmem(void)
240 {
241         int i;
242
243         /* Add active regions with valid PFNs. */
244         for (i = 0; i < lmb.memory.cnt; i++) {
245                 unsigned long start_pfn, end_pfn;
246                 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
247                 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
248                 __add_active_range(0, start_pfn, end_pfn);
249         }
250
251         /* All of system RAM sits in node 0 for the non-NUMA case */
252         allocate_pgdat(0);
253         node_set_online(0);
254
255         plat_mem_setup();
256
257         for_each_online_node(i)
258                 bootmem_init_one_node(i);
259
260         sparse_init();
261 }
262
263 static void __init early_reserve_mem(void)
264 {
265         unsigned long start_pfn;
266
267         /*
268          * Partially used pages are not usable - thus
269          * we are rounding upwards:
270          */
271         start_pfn = PFN_UP(__pa(_end));
272
273         /*
274          * Reserve the kernel text and Reserve the bootmem bitmap. We do
275          * this in two steps (first step was init_bootmem()), because
276          * this catches the (definitely buggy) case of us accidentally
277          * initializing the bootmem allocator with an invalid RAM area.
278          */
279         lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
280                     (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
281                     (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
282
283         /*
284          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
285          */
286         if (CONFIG_ZERO_PAGE_OFFSET != 0)
287                 lmb_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
288
289         /*
290          * Handle additional early reservations
291          */
292         check_for_initrd();
293         reserve_crashkernel();
294 }
295
296 void __init paging_init(void)
297 {
298         unsigned long max_zone_pfns[MAX_NR_ZONES];
299         unsigned long vaddr, end;
300         int nid;
301
302         lmb_init();
303
304         sh_mv.mv_mem_init();
305
306         early_reserve_mem();
307
308         lmb_enforce_memory_limit(memory_limit);
309         lmb_analyze();
310
311         lmb_dump_all();
312
313         /*
314          * Determine low and high memory ranges:
315          */
316         max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
317         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
318
319         nodes_clear(node_online_map);
320
321         memory_start = (unsigned long)__va(__MEMORY_START);
322         memory_end = memory_start + (memory_limit ?: lmb_phys_mem_size());
323
324         uncached_init();
325         pmb_init();
326         do_init_bootmem();
327         ioremap_fixed_init();
328
329         /* We don't need to map the kernel through the TLB, as
330          * it is permanatly mapped using P1. So clear the
331          * entire pgd. */
332         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
333
334         /* Set an initial value for the MMU.TTB so we don't have to
335          * check for a null value. */
336         set_TTB(swapper_pg_dir);
337
338         /*
339          * Populate the relevant portions of swapper_pg_dir so that
340          * we can use the fixmap entries without calling kmalloc.
341          * pte's will be filled in by __set_fixmap().
342          */
343         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
344         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
345         page_table_range_init(vaddr, end, swapper_pg_dir);
346
347         kmap_coherent_init();
348
349         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
350
351         for_each_online_node(nid) {
352                 pg_data_t *pgdat = NODE_DATA(nid);
353                 unsigned long low, start_pfn;
354
355                 start_pfn = pgdat->bdata->node_min_pfn;
356                 low = pgdat->bdata->node_low_pfn;
357
358                 if (max_zone_pfns[ZONE_NORMAL] < low)
359                         max_zone_pfns[ZONE_NORMAL] = low;
360
361                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
362                        nid, start_pfn, low);
363         }
364
365         free_area_init_nodes(max_zone_pfns);
366 }
367
368 /*
369  * Early initialization for any I/O MMUs we might have.
370  */
371 static void __init iommu_init(void)
372 {
373         no_iommu_init();
374 }
375
376 unsigned int mem_init_done = 0;
377
378 void __init mem_init(void)
379 {
380         int codesize, datasize, initsize;
381         int nid;
382
383         iommu_init();
384
385         num_physpages = 0;
386         high_memory = NULL;
387
388         for_each_online_node(nid) {
389                 pg_data_t *pgdat = NODE_DATA(nid);
390                 unsigned long node_pages = 0;
391                 void *node_high_memory;
392
393                 num_physpages += pgdat->node_present_pages;
394
395                 if (pgdat->node_spanned_pages)
396                         node_pages = free_all_bootmem_node(pgdat);
397
398                 totalram_pages += node_pages;
399
400                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
401                                                  pgdat->node_spanned_pages) <<
402                                                  PAGE_SHIFT);
403                 if (node_high_memory > high_memory)
404                         high_memory = node_high_memory;
405         }
406
407         /* Set this up early, so we can take care of the zero page */
408         cpu_cache_init();
409
410         /* clear the zero-page */
411         memset(empty_zero_page, 0, PAGE_SIZE);
412         __flush_wback_region(empty_zero_page, PAGE_SIZE);
413
414         vsyscall_init();
415
416         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
417         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
418         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
419
420         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
421                "%dk data, %dk init)\n",
422                 nr_free_pages() << (PAGE_SHIFT-10),
423                 num_physpages << (PAGE_SHIFT-10),
424                 codesize >> 10,
425                 datasize >> 10,
426                 initsize >> 10);
427
428         printk(KERN_INFO "virtual kernel memory layout:\n"
429                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
430 #ifdef CONFIG_HIGHMEM
431                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
432 #endif
433                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
434                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
435 #ifdef CONFIG_UNCACHED_MAPPING
436                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
437 #endif
438                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
439                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
440                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
441                 FIXADDR_START, FIXADDR_TOP,
442                 (FIXADDR_TOP - FIXADDR_START) >> 10,
443
444 #ifdef CONFIG_HIGHMEM
445                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
446                 (LAST_PKMAP*PAGE_SIZE) >> 10,
447 #endif
448
449                 (unsigned long)VMALLOC_START, VMALLOC_END,
450                 (VMALLOC_END - VMALLOC_START) >> 20,
451
452                 (unsigned long)memory_start, (unsigned long)high_memory,
453                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
454
455 #ifdef CONFIG_UNCACHED_MAPPING
456                 uncached_start, uncached_end, uncached_size >> 20,
457 #endif
458
459                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
460                 ((unsigned long)&__init_end -
461                  (unsigned long)&__init_begin) >> 10,
462
463                 (unsigned long)&_etext, (unsigned long)&_edata,
464                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
465
466                 (unsigned long)&_text, (unsigned long)&_etext,
467                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
468
469         mem_init_done = 1;
470 }
471
472 void free_initmem(void)
473 {
474         unsigned long addr;
475
476         addr = (unsigned long)(&__init_begin);
477         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
478                 ClearPageReserved(virt_to_page(addr));
479                 init_page_count(virt_to_page(addr));
480                 free_page(addr);
481                 totalram_pages++;
482         }
483         printk("Freeing unused kernel memory: %ldk freed\n",
484                ((unsigned long)&__init_end -
485                 (unsigned long)&__init_begin) >> 10);
486 }
487
488 #ifdef CONFIG_BLK_DEV_INITRD
489 void free_initrd_mem(unsigned long start, unsigned long end)
490 {
491         unsigned long p;
492         for (p = start; p < end; p += PAGE_SIZE) {
493                 ClearPageReserved(virt_to_page(p));
494                 init_page_count(virt_to_page(p));
495                 free_page(p);
496                 totalram_pages++;
497         }
498         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
499 }
500 #endif
501
502 #ifdef CONFIG_MEMORY_HOTPLUG
503 int arch_add_memory(int nid, u64 start, u64 size)
504 {
505         pg_data_t *pgdat;
506         unsigned long start_pfn = start >> PAGE_SHIFT;
507         unsigned long nr_pages = size >> PAGE_SHIFT;
508         int ret;
509
510         pgdat = NODE_DATA(nid);
511
512         /* We only have ZONE_NORMAL, so this is easy.. */
513         ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
514                                 start_pfn, nr_pages);
515         if (unlikely(ret))
516                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
517
518         return ret;
519 }
520 EXPORT_SYMBOL_GPL(arch_add_memory);
521
522 #ifdef CONFIG_NUMA
523 int memory_add_physaddr_to_nid(u64 addr)
524 {
525         /* Node 0 for now.. */
526         return 0;
527 }
528 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
529 #endif
530
531 #endif /* CONFIG_MEMORY_HOTPLUG */