memblock: Kill memblock_init()
[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 - 2011  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/memblock.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/export.h>
22 #include <asm/mmu_context.h>
23 #include <asm/mmzone.h>
24 #include <asm/kexec.h>
25 #include <asm/tlb.h>
26 #include <asm/cacheflush.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/cache.h>
30 #include <asm/sizes.h>
31
32 pgd_t swapper_pg_dir[PTRS_PER_PGD];
33
34 void __init generic_mem_init(void)
35 {
36         memblock_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
51         pgd = pgd_offset_k(addr);
52         if (pgd_none(*pgd)) {
53                 pgd_ERROR(*pgd);
54                 return NULL;
55         }
56
57         pud = pud_alloc(NULL, pgd, addr);
58         if (unlikely(!pud)) {
59                 pud_ERROR(*pud);
60                 return NULL;
61         }
62
63         pmd = pmd_alloc(NULL, pud, addr);
64         if (unlikely(!pmd)) {
65                 pmd_ERROR(*pmd);
66                 return NULL;
67         }
68
69         return pte_offset_kernel(pmd, addr);
70 }
71
72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
73 {
74         pte_t *pte;
75
76         pte = __get_pte_phys(addr);
77         if (!pte_none(*pte)) {
78                 pte_ERROR(*pte);
79                 return;
80         }
81
82         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
83         local_flush_tlb_one(get_asid(), addr);
84
85         if (pgprot_val(prot) & _PAGE_WIRED)
86                 tlb_wire_entry(NULL, addr, *pte);
87 }
88
89 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
90 {
91         pte_t *pte;
92
93         pte = __get_pte_phys(addr);
94
95         if (pgprot_val(prot) & _PAGE_WIRED)
96                 tlb_unwire_entry();
97
98         set_pte(pte, pfn_pte(0, __pgprot(0)));
99         local_flush_tlb_one(get_asid(), addr);
100 }
101
102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
103 {
104         unsigned long address = __fix_to_virt(idx);
105
106         if (idx >= __end_of_fixed_addresses) {
107                 BUG();
108                 return;
109         }
110
111         set_pte_phys(address, phys, prot);
112 }
113
114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
115 {
116         unsigned long address = __fix_to_virt(idx);
117
118         if (idx >= __end_of_fixed_addresses) {
119                 BUG();
120                 return;
121         }
122
123         clear_pte_phys(address, prot);
124 }
125
126 static pmd_t * __init one_md_table_init(pud_t *pud)
127 {
128         if (pud_none(*pud)) {
129                 pmd_t *pmd;
130
131                 pmd = alloc_bootmem_pages(PAGE_SIZE);
132                 pud_populate(&init_mm, pud, pmd);
133                 BUG_ON(pmd != pmd_offset(pud, 0));
134         }
135
136         return pmd_offset(pud, 0);
137 }
138
139 static pte_t * __init one_page_table_init(pmd_t *pmd)
140 {
141         if (pmd_none(*pmd)) {
142                 pte_t *pte;
143
144                 pte = alloc_bootmem_pages(PAGE_SIZE);
145                 pmd_populate_kernel(&init_mm, pmd, pte);
146                 BUG_ON(pte != pte_offset_kernel(pmd, 0));
147         }
148
149         return pte_offset_kernel(pmd, 0);
150 }
151
152 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
153                                             unsigned long vaddr, pte_t *lastpte)
154 {
155         return pte;
156 }
157
158 void __init page_table_range_init(unsigned long start, unsigned long end,
159                                          pgd_t *pgd_base)
160 {
161         pgd_t *pgd;
162         pud_t *pud;
163         pmd_t *pmd;
164         pte_t *pte = NULL;
165         int i, j, k;
166         unsigned long vaddr;
167
168         vaddr = start;
169         i = __pgd_offset(vaddr);
170         j = __pud_offset(vaddr);
171         k = __pmd_offset(vaddr);
172         pgd = pgd_base + i;
173
174         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
175                 pud = (pud_t *)pgd;
176                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
177                         pmd = one_md_table_init(pud);
178 #ifndef __PAGETABLE_PMD_FOLDED
179                         pmd += k;
180 #endif
181                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
182                                 pte = page_table_kmap_check(one_page_table_init(pmd),
183                                                             pmd, vaddr, pte);
184                                 vaddr += PMD_SIZE;
185                         }
186                         k = 0;
187                 }
188                 j = 0;
189         }
190 }
191 #endif  /* CONFIG_MMU */
192
193 void __init allocate_pgdat(unsigned int nid)
194 {
195         unsigned long start_pfn, end_pfn;
196 #ifdef CONFIG_NEED_MULTIPLE_NODES
197         unsigned long phys;
198 #endif
199
200         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
201
202 #ifdef CONFIG_NEED_MULTIPLE_NODES
203         phys = __memblock_alloc_base(sizeof(struct pglist_data),
204                                 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
205         /* Retry with all of system memory */
206         if (!phys)
207                 phys = __memblock_alloc_base(sizeof(struct pglist_data),
208                                         SMP_CACHE_BYTES, memblock_end_of_DRAM());
209         if (!phys)
210                 panic("Can't allocate pgdat for node %d\n", nid);
211
212         NODE_DATA(nid) = __va(phys);
213         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
214
215         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
216 #endif
217
218         NODE_DATA(nid)->node_start_pfn = start_pfn;
219         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
220 }
221
222 static void __init bootmem_init_one_node(unsigned int nid)
223 {
224         unsigned long total_pages, paddr;
225         unsigned long end_pfn;
226         struct pglist_data *p;
227
228         p = NODE_DATA(nid);
229
230         /* Nothing to do.. */
231         if (!p->node_spanned_pages)
232                 return;
233
234         end_pfn = p->node_start_pfn + p->node_spanned_pages;
235
236         total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
237
238         paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
239         if (!paddr)
240                 panic("Can't allocate bootmap for nid[%d]\n", nid);
241
242         init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
243
244         free_bootmem_with_active_regions(nid, end_pfn);
245
246         /*
247          * XXX Handle initial reservations for the system memory node
248          * only for the moment, we'll refactor this later for handling
249          * reservations in other nodes.
250          */
251         if (nid == 0) {
252                 struct memblock_region *reg;
253
254                 /* Reserve the sections we're already using. */
255                 for_each_memblock(reserved, reg) {
256                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
257                 }
258         }
259
260         sparse_memory_present_with_active_regions(nid);
261 }
262
263 static void __init do_init_bootmem(void)
264 {
265         struct memblock_region *reg;
266         int i;
267
268         /* Add active regions with valid PFNs. */
269         for_each_memblock(memory, reg) {
270                 unsigned long start_pfn, end_pfn;
271                 start_pfn = memblock_region_memory_base_pfn(reg);
272                 end_pfn = memblock_region_memory_end_pfn(reg);
273                 __add_active_range(0, start_pfn, end_pfn);
274         }
275
276         /* All of system RAM sits in node 0 for the non-NUMA case */
277         allocate_pgdat(0);
278         node_set_online(0);
279
280         plat_mem_setup();
281
282         for_each_online_node(i)
283                 bootmem_init_one_node(i);
284
285         sparse_init();
286 }
287
288 static void __init early_reserve_mem(void)
289 {
290         unsigned long start_pfn;
291         u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
292         u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
293
294         /*
295          * Partially used pages are not usable - thus
296          * we are rounding upwards:
297          */
298         start_pfn = PFN_UP(__pa(_end));
299
300         /*
301          * Reserve the kernel text and Reserve the bootmem bitmap. We do
302          * this in two steps (first step was init_bootmem()), because
303          * this catches the (definitely buggy) case of us accidentally
304          * initializing the bootmem allocator with an invalid RAM area.
305          */
306         memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
307
308         /*
309          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
310          */
311         if (CONFIG_ZERO_PAGE_OFFSET != 0)
312                 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
313
314         /*
315          * Handle additional early reservations
316          */
317         check_for_initrd();
318         reserve_crashkernel();
319 }
320
321 void __init paging_init(void)
322 {
323         unsigned long max_zone_pfns[MAX_NR_ZONES];
324         unsigned long vaddr, end;
325         int nid;
326
327         sh_mv.mv_mem_init();
328
329         early_reserve_mem();
330
331         /*
332          * Once the early reservations are out of the way, give the
333          * platforms a chance to kick out some memory.
334          */
335         if (sh_mv.mv_mem_reserve)
336                 sh_mv.mv_mem_reserve();
337
338         memblock_enforce_memory_limit(memory_limit);
339         memblock_analyze();
340
341         memblock_dump_all();
342
343         /*
344          * Determine low and high memory ranges:
345          */
346         max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
347         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
348
349         nodes_clear(node_online_map);
350
351         memory_start = (unsigned long)__va(__MEMORY_START);
352         memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
353
354         uncached_init();
355         pmb_init();
356         do_init_bootmem();
357         ioremap_fixed_init();
358
359         /* We don't need to map the kernel through the TLB, as
360          * it is permanatly mapped using P1. So clear the
361          * entire pgd. */
362         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
363
364         /* Set an initial value for the MMU.TTB so we don't have to
365          * check for a null value. */
366         set_TTB(swapper_pg_dir);
367
368         /*
369          * Populate the relevant portions of swapper_pg_dir so that
370          * we can use the fixmap entries without calling kmalloc.
371          * pte's will be filled in by __set_fixmap().
372          */
373         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
374         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
375         page_table_range_init(vaddr, end, swapper_pg_dir);
376
377         kmap_coherent_init();
378
379         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
380
381         for_each_online_node(nid) {
382                 pg_data_t *pgdat = NODE_DATA(nid);
383                 unsigned long low, start_pfn;
384
385                 start_pfn = pgdat->bdata->node_min_pfn;
386                 low = pgdat->bdata->node_low_pfn;
387
388                 if (max_zone_pfns[ZONE_NORMAL] < low)
389                         max_zone_pfns[ZONE_NORMAL] = low;
390
391                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
392                        nid, start_pfn, low);
393         }
394
395         free_area_init_nodes(max_zone_pfns);
396 }
397
398 /*
399  * Early initialization for any I/O MMUs we might have.
400  */
401 static void __init iommu_init(void)
402 {
403         no_iommu_init();
404 }
405
406 unsigned int mem_init_done = 0;
407
408 void __init mem_init(void)
409 {
410         int codesize, datasize, initsize;
411         int nid;
412
413         iommu_init();
414
415         num_physpages = 0;
416         high_memory = NULL;
417
418         for_each_online_node(nid) {
419                 pg_data_t *pgdat = NODE_DATA(nid);
420                 unsigned long node_pages = 0;
421                 void *node_high_memory;
422
423                 num_physpages += pgdat->node_present_pages;
424
425                 if (pgdat->node_spanned_pages)
426                         node_pages = free_all_bootmem_node(pgdat);
427
428                 totalram_pages += node_pages;
429
430                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
431                                                  pgdat->node_spanned_pages) <<
432                                                  PAGE_SHIFT);
433                 if (node_high_memory > high_memory)
434                         high_memory = node_high_memory;
435         }
436
437         /* Set this up early, so we can take care of the zero page */
438         cpu_cache_init();
439
440         /* clear the zero-page */
441         memset(empty_zero_page, 0, PAGE_SIZE);
442         __flush_wback_region(empty_zero_page, PAGE_SIZE);
443
444         vsyscall_init();
445
446         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
447         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
448         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
449
450         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
451                "%dk data, %dk init)\n",
452                 nr_free_pages() << (PAGE_SHIFT-10),
453                 num_physpages << (PAGE_SHIFT-10),
454                 codesize >> 10,
455                 datasize >> 10,
456                 initsize >> 10);
457
458         printk(KERN_INFO "virtual kernel memory layout:\n"
459                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
460 #ifdef CONFIG_HIGHMEM
461                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
462 #endif
463                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
464                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
465 #ifdef CONFIG_UNCACHED_MAPPING
466                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
467 #endif
468                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
469                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
470                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
471                 FIXADDR_START, FIXADDR_TOP,
472                 (FIXADDR_TOP - FIXADDR_START) >> 10,
473
474 #ifdef CONFIG_HIGHMEM
475                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
476                 (LAST_PKMAP*PAGE_SIZE) >> 10,
477 #endif
478
479                 (unsigned long)VMALLOC_START, VMALLOC_END,
480                 (VMALLOC_END - VMALLOC_START) >> 20,
481
482                 (unsigned long)memory_start, (unsigned long)high_memory,
483                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
484
485 #ifdef CONFIG_UNCACHED_MAPPING
486                 uncached_start, uncached_end, uncached_size >> 20,
487 #endif
488
489                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
490                 ((unsigned long)&__init_end -
491                  (unsigned long)&__init_begin) >> 10,
492
493                 (unsigned long)&_etext, (unsigned long)&_edata,
494                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
495
496                 (unsigned long)&_text, (unsigned long)&_etext,
497                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
498
499         mem_init_done = 1;
500 }
501
502 void free_initmem(void)
503 {
504         unsigned long addr;
505
506         addr = (unsigned long)(&__init_begin);
507         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
508                 ClearPageReserved(virt_to_page(addr));
509                 init_page_count(virt_to_page(addr));
510                 free_page(addr);
511                 totalram_pages++;
512         }
513         printk("Freeing unused kernel memory: %ldk freed\n",
514                ((unsigned long)&__init_end -
515                 (unsigned long)&__init_begin) >> 10);
516 }
517
518 #ifdef CONFIG_BLK_DEV_INITRD
519 void free_initrd_mem(unsigned long start, unsigned long end)
520 {
521         unsigned long p;
522         for (p = start; p < end; p += PAGE_SIZE) {
523                 ClearPageReserved(virt_to_page(p));
524                 init_page_count(virt_to_page(p));
525                 free_page(p);
526                 totalram_pages++;
527         }
528         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
529 }
530 #endif
531
532 #ifdef CONFIG_MEMORY_HOTPLUG
533 int arch_add_memory(int nid, u64 start, u64 size)
534 {
535         pg_data_t *pgdat;
536         unsigned long start_pfn = start >> PAGE_SHIFT;
537         unsigned long nr_pages = size >> PAGE_SHIFT;
538         int ret;
539
540         pgdat = NODE_DATA(nid);
541
542         /* We only have ZONE_NORMAL, so this is easy.. */
543         ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
544                                 start_pfn, nr_pages);
545         if (unlikely(ret))
546                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
547
548         return ret;
549 }
550 EXPORT_SYMBOL_GPL(arch_add_memory);
551
552 #ifdef CONFIG_NUMA
553 int memory_add_physaddr_to_nid(u64 addr)
554 {
555         /* Node 0 for now.. */
556         return 0;
557 }
558 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
559 #endif
560
561 #endif /* CONFIG_MEMORY_HOTPLUG */