Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / arch / sh / mm / init.c
blob4e5192ba04a5fd223ce62c7d16dbfffba7b9c390
1 /*
2 * linux/arch/sh/mm/init.c
4 * Copyright (C) 1999 Niibe Yutaka
5 * Copyright (C) 2002 - 2011 Paul Mundt
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>
32 pgd_t swapper_pg_dir[PTRS_PER_PGD];
34 void __init generic_mem_init(void)
36 memblock_add(__MEMORY_START, __MEMORY_SIZE);
39 void __init __weak plat_mem_setup(void)
41 /* Nothing to see here, move along. */
44 #ifdef CONFIG_MMU
45 static pte_t *__get_pte_phys(unsigned long addr)
47 pgd_t *pgd;
48 pud_t *pud;
49 pmd_t *pmd;
51 pgd = pgd_offset_k(addr);
52 if (pgd_none(*pgd)) {
53 pgd_ERROR(*pgd);
54 return NULL;
57 pud = pud_alloc(NULL, pgd, addr);
58 if (unlikely(!pud)) {
59 pud_ERROR(*pud);
60 return NULL;
63 pmd = pmd_alloc(NULL, pud, addr);
64 if (unlikely(!pmd)) {
65 pmd_ERROR(*pmd);
66 return NULL;
69 return pte_offset_kernel(pmd, addr);
72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
74 pte_t *pte;
76 pte = __get_pte_phys(addr);
77 if (!pte_none(*pte)) {
78 pte_ERROR(*pte);
79 return;
82 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
83 local_flush_tlb_one(get_asid(), addr);
85 if (pgprot_val(prot) & _PAGE_WIRED)
86 tlb_wire_entry(NULL, addr, *pte);
89 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
91 pte_t *pte;
93 pte = __get_pte_phys(addr);
95 if (pgprot_val(prot) & _PAGE_WIRED)
96 tlb_unwire_entry();
98 set_pte(pte, pfn_pte(0, __pgprot(0)));
99 local_flush_tlb_one(get_asid(), addr);
102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
104 unsigned long address = __fix_to_virt(idx);
106 if (idx >= __end_of_fixed_addresses) {
107 BUG();
108 return;
111 set_pte_phys(address, phys, prot);
114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
116 unsigned long address = __fix_to_virt(idx);
118 if (idx >= __end_of_fixed_addresses) {
119 BUG();
120 return;
123 clear_pte_phys(address, prot);
126 static pmd_t * __init one_md_table_init(pud_t *pud)
128 if (pud_none(*pud)) {
129 pmd_t *pmd;
131 pmd = alloc_bootmem_pages(PAGE_SIZE);
132 pud_populate(&init_mm, pud, pmd);
133 BUG_ON(pmd != pmd_offset(pud, 0));
136 return pmd_offset(pud, 0);
139 static pte_t * __init one_page_table_init(pmd_t *pmd)
141 if (pmd_none(*pmd)) {
142 pte_t *pte;
144 pte = alloc_bootmem_pages(PAGE_SIZE);
145 pmd_populate_kernel(&init_mm, pmd, pte);
146 BUG_ON(pte != pte_offset_kernel(pmd, 0));
149 return pte_offset_kernel(pmd, 0);
152 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
153 unsigned long vaddr, pte_t *lastpte)
155 return pte;
158 void __init page_table_range_init(unsigned long start, unsigned long end,
159 pgd_t *pgd_base)
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;
168 vaddr = start;
169 i = __pgd_offset(vaddr);
170 j = __pud_offset(vaddr);
171 k = __pmd_offset(vaddr);
172 pgd = pgd_base + i;
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;
186 k = 0;
188 j = 0;
191 #endif /* CONFIG_MMU */
193 void __init allocate_pgdat(unsigned int nid)
195 unsigned long start_pfn, end_pfn;
196 #ifdef CONFIG_NEED_MULTIPLE_NODES
197 unsigned long phys;
198 #endif
200 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
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);
212 NODE_DATA(nid) = __va(phys);
213 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
215 NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
216 #endif
218 NODE_DATA(nid)->node_start_pfn = start_pfn;
219 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
222 static void __init bootmem_init_one_node(unsigned int nid)
224 unsigned long total_pages, paddr;
225 unsigned long end_pfn;
226 struct pglist_data *p;
228 p = NODE_DATA(nid);
230 /* Nothing to do.. */
231 if (!p->node_spanned_pages)
232 return;
234 end_pfn = p->node_start_pfn + p->node_spanned_pages;
236 total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
238 paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
239 if (!paddr)
240 panic("Can't allocate bootmap for nid[%d]\n", nid);
242 init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
244 free_bootmem_with_active_regions(nid, end_pfn);
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.
251 if (nid == 0) {
252 struct memblock_region *reg;
254 /* Reserve the sections we're already using. */
255 for_each_memblock(reserved, reg) {
256 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
260 sparse_memory_present_with_active_regions(nid);
263 static void __init do_init_bootmem(void)
265 struct memblock_region *reg;
266 int i;
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);
276 /* All of system RAM sits in node 0 for the non-NUMA case */
277 allocate_pgdat(0);
278 node_set_online(0);
280 plat_mem_setup();
282 for_each_online_node(i)
283 bootmem_init_one_node(i);
285 sparse_init();
288 static void __init early_reserve_mem(void)
290 unsigned long start_pfn;
293 * Partially used pages are not usable - thus
294 * we are rounding upwards:
296 start_pfn = PFN_UP(__pa(_end));
299 * Reserve the kernel text and Reserve the bootmem bitmap. We do
300 * this in two steps (first step was init_bootmem()), because
301 * this catches the (definitely buggy) case of us accidentally
302 * initializing the bootmem allocator with an invalid RAM area.
304 memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
305 (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
306 (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
309 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
311 if (CONFIG_ZERO_PAGE_OFFSET != 0)
312 memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
315 * Handle additional early reservations
317 check_for_initrd();
318 reserve_crashkernel();
321 void __init paging_init(void)
323 unsigned long max_zone_pfns[MAX_NR_ZONES];
324 unsigned long vaddr, end;
325 int nid;
327 memblock_init();
328 sh_mv.mv_mem_init();
330 early_reserve_mem();
333 * Once the early reservations are out of the way, give the
334 * platforms a chance to kick out some memory.
336 if (sh_mv.mv_mem_reserve)
337 sh_mv.mv_mem_reserve();
339 memblock_enforce_memory_limit(memory_limit);
340 memblock_analyze();
342 memblock_dump_all();
345 * Determine low and high memory ranges:
347 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
348 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
350 nodes_clear(node_online_map);
352 memory_start = (unsigned long)__va(__MEMORY_START);
353 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
355 uncached_init();
356 pmb_init();
357 do_init_bootmem();
358 ioremap_fixed_init();
360 /* We don't need to map the kernel through the TLB, as
361 * it is permanatly mapped using P1. So clear the
362 * entire pgd. */
363 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
365 /* Set an initial value for the MMU.TTB so we don't have to
366 * check for a null value. */
367 set_TTB(swapper_pg_dir);
370 * Populate the relevant portions of swapper_pg_dir so that
371 * we can use the fixmap entries without calling kmalloc.
372 * pte's will be filled in by __set_fixmap().
374 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
375 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
376 page_table_range_init(vaddr, end, swapper_pg_dir);
378 kmap_coherent_init();
380 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
382 for_each_online_node(nid) {
383 pg_data_t *pgdat = NODE_DATA(nid);
384 unsigned long low, start_pfn;
386 start_pfn = pgdat->bdata->node_min_pfn;
387 low = pgdat->bdata->node_low_pfn;
389 if (max_zone_pfns[ZONE_NORMAL] < low)
390 max_zone_pfns[ZONE_NORMAL] = low;
392 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
393 nid, start_pfn, low);
396 free_area_init_nodes(max_zone_pfns);
400 * Early initialization for any I/O MMUs we might have.
402 static void __init iommu_init(void)
404 no_iommu_init();
407 unsigned int mem_init_done = 0;
409 void __init mem_init(void)
411 int codesize, datasize, initsize;
412 int nid;
414 iommu_init();
416 num_physpages = 0;
417 high_memory = NULL;
419 for_each_online_node(nid) {
420 pg_data_t *pgdat = NODE_DATA(nid);
421 unsigned long node_pages = 0;
422 void *node_high_memory;
424 num_physpages += pgdat->node_present_pages;
426 if (pgdat->node_spanned_pages)
427 node_pages = free_all_bootmem_node(pgdat);
429 totalram_pages += node_pages;
431 node_high_memory = (void *)__va((pgdat->node_start_pfn +
432 pgdat->node_spanned_pages) <<
433 PAGE_SHIFT);
434 if (node_high_memory > high_memory)
435 high_memory = node_high_memory;
438 /* Set this up early, so we can take care of the zero page */
439 cpu_cache_init();
441 /* clear the zero-page */
442 memset(empty_zero_page, 0, PAGE_SIZE);
443 __flush_wback_region(empty_zero_page, PAGE_SIZE);
445 vsyscall_init();
447 codesize = (unsigned long) &_etext - (unsigned long) &_text;
448 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
449 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
451 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
452 "%dk data, %dk init)\n",
453 nr_free_pages() << (PAGE_SHIFT-10),
454 num_physpages << (PAGE_SHIFT-10),
455 codesize >> 10,
456 datasize >> 10,
457 initsize >> 10);
459 printk(KERN_INFO "virtual kernel memory layout:\n"
460 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
461 #ifdef CONFIG_HIGHMEM
462 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
463 #endif
464 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
465 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
466 #ifdef CONFIG_UNCACHED_MAPPING
467 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
468 #endif
469 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
470 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
471 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
472 FIXADDR_START, FIXADDR_TOP,
473 (FIXADDR_TOP - FIXADDR_START) >> 10,
475 #ifdef CONFIG_HIGHMEM
476 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
477 (LAST_PKMAP*PAGE_SIZE) >> 10,
478 #endif
480 (unsigned long)VMALLOC_START, VMALLOC_END,
481 (VMALLOC_END - VMALLOC_START) >> 20,
483 (unsigned long)memory_start, (unsigned long)high_memory,
484 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
486 #ifdef CONFIG_UNCACHED_MAPPING
487 uncached_start, uncached_end, uncached_size >> 20,
488 #endif
490 (unsigned long)&__init_begin, (unsigned long)&__init_end,
491 ((unsigned long)&__init_end -
492 (unsigned long)&__init_begin) >> 10,
494 (unsigned long)&_etext, (unsigned long)&_edata,
495 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
497 (unsigned long)&_text, (unsigned long)&_etext,
498 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
500 mem_init_done = 1;
503 void free_initmem(void)
505 unsigned long addr;
507 addr = (unsigned long)(&__init_begin);
508 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
509 ClearPageReserved(virt_to_page(addr));
510 init_page_count(virt_to_page(addr));
511 free_page(addr);
512 totalram_pages++;
514 printk("Freeing unused kernel memory: %ldk freed\n",
515 ((unsigned long)&__init_end -
516 (unsigned long)&__init_begin) >> 10);
519 #ifdef CONFIG_BLK_DEV_INITRD
520 void free_initrd_mem(unsigned long start, unsigned long end)
522 unsigned long p;
523 for (p = start; p < end; p += PAGE_SIZE) {
524 ClearPageReserved(virt_to_page(p));
525 init_page_count(virt_to_page(p));
526 free_page(p);
527 totalram_pages++;
529 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
531 #endif
533 #ifdef CONFIG_MEMORY_HOTPLUG
534 int arch_add_memory(int nid, u64 start, u64 size)
536 pg_data_t *pgdat;
537 unsigned long start_pfn = start >> PAGE_SHIFT;
538 unsigned long nr_pages = size >> PAGE_SHIFT;
539 int ret;
541 pgdat = NODE_DATA(nid);
543 /* We only have ZONE_NORMAL, so this is easy.. */
544 ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
545 start_pfn, nr_pages);
546 if (unlikely(ret))
547 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
549 return ret;
551 EXPORT_SYMBOL_GPL(arch_add_memory);
553 #ifdef CONFIG_NUMA
554 int memory_add_physaddr_to_nid(u64 addr)
556 /* Node 0 for now.. */
557 return 0;
559 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
560 #endif
562 #endif /* CONFIG_MEMORY_HOTPLUG */