2 * linux/arch/sh/mm/init.c
4 * Copyright (C) 1999 Niibe Yutaka
5 * Copyright (C) 2002 - 2007 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/bootmem.h>
14 #include <linux/proc_fs.h>
15 #include <linux/pagemap.h>
16 #include <linux/percpu.h>
18 #include <linux/dma-mapping.h>
19 #include <asm/mmu_context.h>
21 #include <asm/cacheflush.h>
22 #include <asm/sections.h>
23 #include <asm/cache.h>
24 #include <asm/sizes.h>
26 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
27 pgd_t swapper_pg_dir[PTRS_PER_PGD];
30 static pte_t *__get_pte_phys(unsigned long addr)
37 pgd = pgd_offset_k(addr);
43 pud = pud_alloc(NULL, pgd, addr);
49 pmd = pmd_alloc(NULL, pud, addr);
55 pte = pte_offset_kernel(pmd, addr);
59 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
63 pte = __get_pte_phys(addr);
64 if (!pte_none(*pte)) {
69 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
70 local_flush_tlb_one(get_asid(), addr);
72 if (pgprot_val(prot) & _PAGE_WIRED)
73 tlb_wire_entry(NULL, addr, *pte);
76 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
80 pte = __get_pte_phys(addr);
82 if (pgprot_val(prot) & _PAGE_WIRED)
85 set_pte(pte, pfn_pte(0, __pgprot(0)));
86 local_flush_tlb_one(get_asid(), addr);
89 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
91 unsigned long address = __fix_to_virt(idx);
93 if (idx >= __end_of_fixed_addresses) {
98 set_pte_phys(address, phys, prot);
101 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
103 unsigned long address = __fix_to_virt(idx);
105 if (idx >= __end_of_fixed_addresses) {
110 clear_pte_phys(address, prot);
113 void __init page_table_range_init(unsigned long start, unsigned long end,
124 i = __pgd_offset(vaddr);
125 j = __pud_offset(vaddr);
126 k = __pmd_offset(vaddr);
129 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
131 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
132 #ifdef __PAGETABLE_PMD_FOLDED
135 pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
136 pud_populate(&init_mm, pud, pmd);
139 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
140 if (pmd_none(*pmd)) {
141 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
142 pmd_populate_kernel(&init_mm, pmd, pte);
143 BUG_ON(pte != pte_offset_kernel(pmd, 0));
152 #endif /* CONFIG_MMU */
155 * paging_init() sets up the page tables
157 void __init paging_init(void)
159 unsigned long max_zone_pfns[MAX_NR_ZONES];
160 unsigned long vaddr, end;
163 /* We don't need to map the kernel through the TLB, as
164 * it is permanatly mapped using P1. So clear the
166 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
168 /* Set an initial value for the MMU.TTB so we don't have to
169 * check for a null value. */
170 set_TTB(swapper_pg_dir);
173 * Populate the relevant portions of swapper_pg_dir so that
174 * we can use the fixmap entries without calling kmalloc.
175 * pte's will be filled in by __set_fixmap().
177 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
178 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
179 page_table_range_init(vaddr, end, swapper_pg_dir);
181 kmap_coherent_init();
183 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
185 for_each_online_node(nid) {
186 pg_data_t *pgdat = NODE_DATA(nid);
187 unsigned long low, start_pfn;
189 start_pfn = pgdat->bdata->node_min_pfn;
190 low = pgdat->bdata->node_low_pfn;
192 if (max_zone_pfns[ZONE_NORMAL] < low)
193 max_zone_pfns[ZONE_NORMAL] = low;
195 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
196 nid, start_pfn, low);
199 free_area_init_nodes(max_zone_pfns);
203 * Early initialization for any I/O MMUs we might have.
205 static void __init iommu_init(void)
210 unsigned int mem_init_done = 0;
212 void __init mem_init(void)
214 int codesize, datasize, initsize;
222 for_each_online_node(nid) {
223 pg_data_t *pgdat = NODE_DATA(nid);
224 unsigned long node_pages = 0;
225 void *node_high_memory;
227 num_physpages += pgdat->node_present_pages;
229 if (pgdat->node_spanned_pages)
230 node_pages = free_all_bootmem_node(pgdat);
232 totalram_pages += node_pages;
234 node_high_memory = (void *)__va((pgdat->node_start_pfn +
235 pgdat->node_spanned_pages) <<
237 if (node_high_memory > high_memory)
238 high_memory = node_high_memory;
241 /* Set this up early, so we can take care of the zero page */
244 /* clear the zero-page */
245 memset(empty_zero_page, 0, PAGE_SIZE);
246 __flush_wback_region(empty_zero_page, PAGE_SIZE);
250 codesize = (unsigned long) &_etext - (unsigned long) &_text;
251 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
252 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
254 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
255 "%dk data, %dk init)\n",
256 nr_free_pages() << (PAGE_SHIFT-10),
257 num_physpages << (PAGE_SHIFT-10),
262 printk(KERN_INFO "virtual kernel memory layout:\n"
263 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
264 #ifdef CONFIG_HIGHMEM
265 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
267 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
268 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
269 #ifdef CONFIG_UNCACHED_MAPPING
270 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
272 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
273 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
274 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
275 FIXADDR_START, FIXADDR_TOP,
276 (FIXADDR_TOP - FIXADDR_START) >> 10,
278 #ifdef CONFIG_HIGHMEM
279 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
280 (LAST_PKMAP*PAGE_SIZE) >> 10,
283 (unsigned long)VMALLOC_START, VMALLOC_END,
284 (VMALLOC_END - VMALLOC_START) >> 20,
286 (unsigned long)memory_start, (unsigned long)high_memory,
287 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
289 #ifdef CONFIG_UNCACHED_MAPPING
290 uncached_start, uncached_end, uncached_size >> 20,
293 (unsigned long)&__init_begin, (unsigned long)&__init_end,
294 ((unsigned long)&__init_end -
295 (unsigned long)&__init_begin) >> 10,
297 (unsigned long)&_etext, (unsigned long)&_edata,
298 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
300 (unsigned long)&_text, (unsigned long)&_etext,
301 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
306 void free_initmem(void)
310 addr = (unsigned long)(&__init_begin);
311 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
312 ClearPageReserved(virt_to_page(addr));
313 init_page_count(virt_to_page(addr));
317 printk("Freeing unused kernel memory: %ldk freed\n",
318 ((unsigned long)&__init_end -
319 (unsigned long)&__init_begin) >> 10);
322 #ifdef CONFIG_BLK_DEV_INITRD
323 void free_initrd_mem(unsigned long start, unsigned long end)
326 for (p = start; p < end; p += PAGE_SIZE) {
327 ClearPageReserved(virt_to_page(p));
328 init_page_count(virt_to_page(p));
332 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
336 #ifdef CONFIG_MEMORY_HOTPLUG
337 int arch_add_memory(int nid, u64 start, u64 size)
340 unsigned long start_pfn = start >> PAGE_SHIFT;
341 unsigned long nr_pages = size >> PAGE_SHIFT;
344 pgdat = NODE_DATA(nid);
346 /* We only have ZONE_NORMAL, so this is easy.. */
347 ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
348 start_pfn, nr_pages);
350 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
354 EXPORT_SYMBOL_GPL(arch_add_memory);
357 int memory_add_physaddr_to_nid(u64 addr)
359 /* Node 0 for now.. */
362 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
365 #endif /* CONFIG_MEMORY_HOTPLUG */