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
11 #include <linux/swap.h>
12 #include <linux/init.h>
13 #include <linux/gfp.h>
14 #include <linux/memblock.h>
15 #include <linux/proc_fs.h>
16 #include <linux/pagemap.h>
17 #include <linux/percpu.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/export.h>
21 #include <asm/mmu_context.h>
22 #include <asm/mmzone.h>
23 #include <asm/kexec.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>
31 pgd_t swapper_pg_dir[PTRS_PER_PGD];
33 void __init generic_mem_init(void)
35 memblock_add(__MEMORY_START, __MEMORY_SIZE);
38 void __init __weak plat_mem_setup(void)
40 /* Nothing to see here, move along. */
44 static pte_t *__get_pte_phys(unsigned long addr)
50 pgd = pgd_offset_k(addr);
56 pud = pud_alloc(NULL, pgd, addr);
62 pmd = pmd_alloc(NULL, pud, addr);
68 return pte_offset_kernel(pmd, addr);
71 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
75 pte = __get_pte_phys(addr);
76 if (!pte_none(*pte)) {
81 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
82 local_flush_tlb_one(get_asid(), addr);
84 if (pgprot_val(prot) & _PAGE_WIRED)
85 tlb_wire_entry(NULL, addr, *pte);
88 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
92 pte = __get_pte_phys(addr);
94 if (pgprot_val(prot) & _PAGE_WIRED)
97 set_pte(pte, pfn_pte(0, __pgprot(0)));
98 local_flush_tlb_one(get_asid(), addr);
101 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
103 unsigned long address = __fix_to_virt(idx);
105 if (idx >= __end_of_fixed_addresses) {
110 set_pte_phys(address, phys, prot);
113 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
115 unsigned long address = __fix_to_virt(idx);
117 if (idx >= __end_of_fixed_addresses) {
122 clear_pte_phys(address, prot);
125 static pmd_t * __init one_md_table_init(pud_t *pud)
127 if (pud_none(*pud)) {
130 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
131 pud_populate(&init_mm, pud, pmd);
132 BUG_ON(pmd != pmd_offset(pud, 0));
135 return pmd_offset(pud, 0);
138 static pte_t * __init one_page_table_init(pmd_t *pmd)
140 if (pmd_none(*pmd)) {
143 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
144 pmd_populate_kernel(&init_mm, pmd, pte);
145 BUG_ON(pte != pte_offset_kernel(pmd, 0));
148 return pte_offset_kernel(pmd, 0);
151 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
152 unsigned long vaddr, pte_t *lastpte)
157 void __init page_table_range_init(unsigned long start, unsigned long end,
168 i = __pgd_offset(vaddr);
169 j = __pud_offset(vaddr);
170 k = __pmd_offset(vaddr);
173 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
175 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
176 pmd = one_md_table_init(pud);
177 #ifndef __PAGETABLE_PMD_FOLDED
180 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
181 pte = page_table_kmap_check(one_page_table_init(pmd),
190 #endif /* CONFIG_MMU */
192 void __init allocate_pgdat(unsigned int nid)
194 unsigned long start_pfn, end_pfn;
195 #ifdef CONFIG_NEED_MULTIPLE_NODES
199 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
201 #ifdef CONFIG_NEED_MULTIPLE_NODES
202 phys = __memblock_alloc_base(sizeof(struct pglist_data),
203 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
204 /* Retry with all of system memory */
206 phys = __memblock_alloc_base(sizeof(struct pglist_data),
207 SMP_CACHE_BYTES, memblock_end_of_DRAM());
209 panic("Can't allocate pgdat for node %d\n", nid);
211 NODE_DATA(nid) = __va(phys);
212 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
215 NODE_DATA(nid)->node_start_pfn = start_pfn;
216 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
219 static void __init do_init_bootmem(void)
221 struct memblock_region *reg;
223 /* Add active regions with valid PFNs. */
224 for_each_memblock(memory, reg) {
225 unsigned long start_pfn, end_pfn;
226 start_pfn = memblock_region_memory_base_pfn(reg);
227 end_pfn = memblock_region_memory_end_pfn(reg);
228 __add_active_range(0, start_pfn, end_pfn);
231 /* All of system RAM sits in node 0 for the non-NUMA case */
237 for_each_memblock(memory, reg) {
238 int nid = memblock_get_region_node(reg);
240 memory_present(nid, memblock_region_memory_base_pfn(reg),
241 memblock_region_memory_end_pfn(reg));
246 static void __init early_reserve_mem(void)
248 unsigned long start_pfn;
249 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
250 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
253 * Partially used pages are not usable - thus
254 * we are rounding upwards:
256 start_pfn = PFN_UP(__pa(_end));
259 * Reserve the kernel text and Reserve the bootmem bitmap. We do
260 * this in two steps (first step was init_bootmem()), because
261 * this catches the (definitely buggy) case of us accidentally
262 * initializing the bootmem allocator with an invalid RAM area.
264 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
267 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
269 if (CONFIG_ZERO_PAGE_OFFSET != 0)
270 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
273 * Handle additional early reservations
276 reserve_crashkernel();
279 void __init paging_init(void)
281 unsigned long max_zone_pfns[MAX_NR_ZONES];
282 unsigned long vaddr, end;
289 * Once the early reservations are out of the way, give the
290 * platforms a chance to kick out some memory.
292 if (sh_mv.mv_mem_reserve)
293 sh_mv.mv_mem_reserve();
295 memblock_enforce_memory_limit(memory_limit);
296 memblock_allow_resize();
301 * Determine low and high memory ranges:
303 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
304 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
306 nodes_clear(node_online_map);
308 memory_start = (unsigned long)__va(__MEMORY_START);
309 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
314 ioremap_fixed_init();
316 /* We don't need to map the kernel through the TLB, as
317 * it is permanatly mapped using P1. So clear the
319 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
321 /* Set an initial value for the MMU.TTB so we don't have to
322 * check for a null value. */
323 set_TTB(swapper_pg_dir);
326 * Populate the relevant portions of swapper_pg_dir so that
327 * we can use the fixmap entries without calling kmalloc.
328 * pte's will be filled in by __set_fixmap().
330 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
331 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
332 page_table_range_init(vaddr, end, swapper_pg_dir);
334 kmap_coherent_init();
336 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
337 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
338 free_area_init_nodes(max_zone_pfns);
341 unsigned int mem_init_done = 0;
343 void __init mem_init(void)
348 for_each_online_pgdat(pgdat)
349 high_memory = max_t(void *, high_memory,
350 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
354 /* Set this up early, so we can take care of the zero page */
357 /* clear the zero-page */
358 memset(empty_zero_page, 0, PAGE_SIZE);
359 __flush_wback_region(empty_zero_page, PAGE_SIZE);
363 mem_init_print_info(NULL);
364 pr_info("virtual kernel memory layout:\n"
365 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
366 #ifdef CONFIG_HIGHMEM
367 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
369 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
370 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
371 #ifdef CONFIG_UNCACHED_MAPPING
372 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
374 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
375 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
376 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
377 FIXADDR_START, FIXADDR_TOP,
378 (FIXADDR_TOP - FIXADDR_START) >> 10,
380 #ifdef CONFIG_HIGHMEM
381 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
382 (LAST_PKMAP*PAGE_SIZE) >> 10,
385 (unsigned long)VMALLOC_START, VMALLOC_END,
386 (VMALLOC_END - VMALLOC_START) >> 20,
388 (unsigned long)memory_start, (unsigned long)high_memory,
389 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
391 #ifdef CONFIG_UNCACHED_MAPPING
392 uncached_start, uncached_end, uncached_size >> 20,
395 (unsigned long)&__init_begin, (unsigned long)&__init_end,
396 ((unsigned long)&__init_end -
397 (unsigned long)&__init_begin) >> 10,
399 (unsigned long)&_etext, (unsigned long)&_edata,
400 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
402 (unsigned long)&_text, (unsigned long)&_etext,
403 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
408 void free_initmem(void)
410 free_initmem_default(-1);
413 #ifdef CONFIG_BLK_DEV_INITRD
414 void free_initrd_mem(unsigned long start, unsigned long end)
416 free_reserved_area((void *)start, (void *)end, -1, "initrd");
420 #ifdef CONFIG_MEMORY_HOTPLUG
421 int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
424 unsigned long start_pfn = PFN_DOWN(start);
425 unsigned long nr_pages = size >> PAGE_SHIFT;
428 /* We only have ZONE_NORMAL, so this is easy.. */
429 ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
431 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
437 int memory_add_physaddr_to_nid(u64 addr)
439 /* Node 0 for now.. */
442 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
445 #ifdef CONFIG_MEMORY_HOTREMOVE
446 int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap)
448 unsigned long start_pfn = PFN_DOWN(start);
449 unsigned long nr_pages = size >> PAGE_SHIFT;
453 zone = page_zone(pfn_to_page(start_pfn));
454 ret = __remove_pages(zone, start_pfn, nr_pages, altmap);
456 pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
462 #endif /* CONFIG_MEMORY_HOTPLUG */