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/gfp.h>
14 #include <linux/bootmem.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 <asm/mmu_context.h>
22 #include <asm/cacheflush.h>
23 #include <asm/sections.h>
24 #include <asm/cache.h>
25 #include <asm/sizes.h>
27 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
28 pgd_t swapper_pg_dir[PTRS_PER_PGD];
31 static pte_t *__get_pte_phys(unsigned long addr)
38 pgd = pgd_offset_k(addr);
44 pud = pud_alloc(NULL, pgd, addr);
50 pmd = pmd_alloc(NULL, pud, addr);
56 pte = pte_offset_kernel(pmd, addr);
60 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
64 pte = __get_pte_phys(addr);
65 if (!pte_none(*pte)) {
70 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
71 local_flush_tlb_one(get_asid(), addr);
73 if (pgprot_val(prot) & _PAGE_WIRED)
74 tlb_wire_entry(NULL, addr, *pte);
77 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
81 pte = __get_pte_phys(addr);
83 if (pgprot_val(prot) & _PAGE_WIRED)
86 set_pte(pte, pfn_pte(0, __pgprot(0)));
87 local_flush_tlb_one(get_asid(), addr);
90 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
92 unsigned long address = __fix_to_virt(idx);
94 if (idx >= __end_of_fixed_addresses) {
99 set_pte_phys(address, phys, prot);
102 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
104 unsigned long address = __fix_to_virt(idx);
106 if (idx >= __end_of_fixed_addresses) {
111 clear_pte_phys(address, prot);
114 void __init page_table_range_init(unsigned long start, unsigned long end,
125 i = __pgd_offset(vaddr);
126 j = __pud_offset(vaddr);
127 k = __pmd_offset(vaddr);
130 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
132 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
133 #ifdef __PAGETABLE_PMD_FOLDED
136 pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
137 pud_populate(&init_mm, pud, pmd);
140 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
141 if (pmd_none(*pmd)) {
142 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
143 pmd_populate_kernel(&init_mm, pmd, pte);
144 BUG_ON(pte != pte_offset_kernel(pmd, 0));
153 #endif /* CONFIG_MMU */
156 * paging_init() sets up the page tables
158 void __init paging_init(void)
160 unsigned long max_zone_pfns[MAX_NR_ZONES];
161 unsigned long vaddr, end;
164 /* We don't need to map the kernel through the TLB, as
165 * it is permanatly mapped using P1. So clear the
167 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
169 /* Set an initial value for the MMU.TTB so we don't have to
170 * check for a null value. */
171 set_TTB(swapper_pg_dir);
174 * Populate the relevant portions of swapper_pg_dir so that
175 * we can use the fixmap entries without calling kmalloc.
176 * pte's will be filled in by __set_fixmap().
178 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
179 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
180 page_table_range_init(vaddr, end, swapper_pg_dir);
182 kmap_coherent_init();
184 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
186 for_each_online_node(nid) {
187 pg_data_t *pgdat = NODE_DATA(nid);
188 unsigned long low, start_pfn;
190 start_pfn = pgdat->bdata->node_min_pfn;
191 low = pgdat->bdata->node_low_pfn;
193 if (max_zone_pfns[ZONE_NORMAL] < low)
194 max_zone_pfns[ZONE_NORMAL] = low;
196 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
197 nid, start_pfn, low);
200 free_area_init_nodes(max_zone_pfns);
204 * Early initialization for any I/O MMUs we might have.
206 static void __init iommu_init(void)
211 unsigned int mem_init_done = 0;
213 void __init mem_init(void)
215 int codesize, datasize, initsize;
223 for_each_online_node(nid) {
224 pg_data_t *pgdat = NODE_DATA(nid);
225 unsigned long node_pages = 0;
226 void *node_high_memory;
228 num_physpages += pgdat->node_present_pages;
230 if (pgdat->node_spanned_pages)
231 node_pages = free_all_bootmem_node(pgdat);
233 totalram_pages += node_pages;
235 node_high_memory = (void *)__va((pgdat->node_start_pfn +
236 pgdat->node_spanned_pages) <<
238 if (node_high_memory > high_memory)
239 high_memory = node_high_memory;
242 /* Set this up early, so we can take care of the zero page */
245 /* clear the zero-page */
246 memset(empty_zero_page, 0, PAGE_SIZE);
247 __flush_wback_region(empty_zero_page, PAGE_SIZE);
251 codesize = (unsigned long) &_etext - (unsigned long) &_text;
252 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
253 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
255 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
256 "%dk data, %dk init)\n",
257 nr_free_pages() << (PAGE_SHIFT-10),
258 num_physpages << (PAGE_SHIFT-10),
263 printk(KERN_INFO "virtual kernel memory layout:\n"
264 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
265 #ifdef CONFIG_HIGHMEM
266 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
268 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
269 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
270 #ifdef CONFIG_UNCACHED_MAPPING
271 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
273 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
274 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
275 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
276 FIXADDR_START, FIXADDR_TOP,
277 (FIXADDR_TOP - FIXADDR_START) >> 10,
279 #ifdef CONFIG_HIGHMEM
280 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
281 (LAST_PKMAP*PAGE_SIZE) >> 10,
284 (unsigned long)VMALLOC_START, VMALLOC_END,
285 (VMALLOC_END - VMALLOC_START) >> 20,
287 (unsigned long)memory_start, (unsigned long)high_memory,
288 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
290 #ifdef CONFIG_UNCACHED_MAPPING
291 uncached_start, uncached_end, uncached_size >> 20,
294 (unsigned long)&__init_begin, (unsigned long)&__init_end,
295 ((unsigned long)&__init_end -
296 (unsigned long)&__init_begin) >> 10,
298 (unsigned long)&_etext, (unsigned long)&_edata,
299 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
301 (unsigned long)&_text, (unsigned long)&_etext,
302 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
307 void free_initmem(void)
311 addr = (unsigned long)(&__init_begin);
312 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
313 ClearPageReserved(virt_to_page(addr));
314 init_page_count(virt_to_page(addr));
318 printk("Freeing unused kernel memory: %ldk freed\n",
319 ((unsigned long)&__init_end -
320 (unsigned long)&__init_begin) >> 10);
323 #ifdef CONFIG_BLK_DEV_INITRD
324 void free_initrd_mem(unsigned long start, unsigned long end)
327 for (p = start; p < end; p += PAGE_SIZE) {
328 ClearPageReserved(virt_to_page(p));
329 init_page_count(virt_to_page(p));
333 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
337 #ifdef CONFIG_MEMORY_HOTPLUG
338 int arch_add_memory(int nid, u64 start, u64 size)
341 unsigned long start_pfn = start >> PAGE_SHIFT;
342 unsigned long nr_pages = size >> PAGE_SHIFT;
345 pgdat = NODE_DATA(nid);
347 /* We only have ZONE_NORMAL, so this is easy.. */
348 ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
349 start_pfn, nr_pages);
351 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
355 EXPORT_SYMBOL_GPL(arch_add_memory);
358 int memory_add_physaddr_to_nid(u64 addr)
360 /* Node 0 for now.. */
363 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
366 #endif /* CONFIG_MEMORY_HOTPLUG */