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Linux/arch/sh/mm/init.c

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  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 = pgdat_end_pfn(p);
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_allow_resize();
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         pg_data_t *pgdat;
411 
412         iommu_init();
413 
414         high_memory = NULL;
415         for_each_online_pgdat(pgdat)
416                 high_memory = max_t(void *, high_memory,
417                                     __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
418 
419         free_all_bootmem();
420 
421         /* Set this up early, so we can take care of the zero page */
422         cpu_cache_init();
423 
424         /* clear the zero-page */
425         memset(empty_zero_page, 0, PAGE_SIZE);
426         __flush_wback_region(empty_zero_page, PAGE_SIZE);
427 
428         vsyscall_init();
429 
430         mem_init_print_info(NULL);
431         pr_info("virtual kernel memory layout:\n"
432                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
433 #ifdef CONFIG_HIGHMEM
434                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
435 #endif
436                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
437                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
438 #ifdef CONFIG_UNCACHED_MAPPING
439                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
440 #endif
441                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
442                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
443                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
444                 FIXADDR_START, FIXADDR_TOP,
445                 (FIXADDR_TOP - FIXADDR_START) >> 10,
446 
447 #ifdef CONFIG_HIGHMEM
448                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
449                 (LAST_PKMAP*PAGE_SIZE) >> 10,
450 #endif
451 
452                 (unsigned long)VMALLOC_START, VMALLOC_END,
453                 (VMALLOC_END - VMALLOC_START) >> 20,
454 
455                 (unsigned long)memory_start, (unsigned long)high_memory,
456                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
457 
458 #ifdef CONFIG_UNCACHED_MAPPING
459                 uncached_start, uncached_end, uncached_size >> 20,
460 #endif
461 
462                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
463                 ((unsigned long)&__init_end -
464                  (unsigned long)&__init_begin) >> 10,
465 
466                 (unsigned long)&_etext, (unsigned long)&_edata,
467                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
468 
469                 (unsigned long)&_text, (unsigned long)&_etext,
470                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
471 
472         mem_init_done = 1;
473 }
474 
475 void free_initmem(void)
476 {
477         free_initmem_default(-1);
478 }
479 
480 #ifdef CONFIG_BLK_DEV_INITRD
481 void free_initrd_mem(unsigned long start, unsigned long end)
482 {
483         free_reserved_area((void *)start, (void *)end, -1, "initrd");
484 }
485 #endif
486 
487 #ifdef CONFIG_MEMORY_HOTPLUG
488 int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
489 {
490         pg_data_t *pgdat;
491         unsigned long start_pfn = PFN_DOWN(start);
492         unsigned long nr_pages = size >> PAGE_SHIFT;
493         int ret;
494 
495         pgdat = NODE_DATA(nid);
496 
497         /* We only have ZONE_NORMAL, so this is easy.. */
498         ret = __add_pages(nid, pgdat->node_zones +
499                         zone_for_memory(nid, start, size, ZONE_NORMAL,
500                         for_device),
501                         start_pfn, nr_pages);
502         if (unlikely(ret))
503                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
504 
505         return ret;
506 }
507 EXPORT_SYMBOL_GPL(arch_add_memory);
508 
509 #ifdef CONFIG_NUMA
510 int memory_add_physaddr_to_nid(u64 addr)
511 {
512         /* Node 0 for now.. */
513         return 0;
514 }
515 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
516 #endif
517 
518 #ifdef CONFIG_MEMORY_HOTREMOVE
519 int arch_remove_memory(u64 start, u64 size)
520 {
521         unsigned long start_pfn = PFN_DOWN(start);
522         unsigned long nr_pages = size >> PAGE_SHIFT;
523         struct zone *zone;
524         int ret;
525 
526         zone = page_zone(pfn_to_page(start_pfn));
527         ret = __remove_pages(zone, start_pfn, nr_pages);
528         if (unlikely(ret))
529                 pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
530                         ret);
531 
532         return ret;
533 }
534 #endif
535 #endif /* CONFIG_MEMORY_HOTPLUG */
536 

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