ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / arch / avr32 / mm / init.c
blob0e64ddc45e3750f17e33b5be98789c9bed6176cc
1 /*
2 * Copyright (C) 2004-2006 Atmel Corporation
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
9 #include <linux/kernel.h>
10 #include <linux/mm.h>
11 #include <linux/swap.h>
12 #include <linux/init.h>
13 #include <linux/mmzone.h>
14 #include <linux/bootmem.h>
15 #include <linux/pagemap.h>
16 #include <linux/nodemask.h>
18 #include <asm/page.h>
19 #include <asm/mmu_context.h>
20 #include <asm/tlb.h>
21 #include <asm/io.h>
22 #include <asm/dma.h>
23 #include <asm/setup.h>
24 #include <asm/sections.h>
26 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
28 pgd_t swapper_pg_dir[PTRS_PER_PGD];
30 struct page *empty_zero_page;
33 * Cache of MMU context last used.
35 unsigned long mmu_context_cache = NO_CONTEXT;
37 void show_mem(void)
39 int total = 0, reserved = 0, cached = 0;
40 int slab = 0, free = 0, shared = 0;
41 pg_data_t *pgdat;
43 printk("Mem-info:\n");
44 show_free_areas();
46 for_each_online_pgdat(pgdat) {
47 struct page *page, *end;
49 page = pgdat->node_mem_map;
50 end = page + pgdat->node_spanned_pages;
52 do {
53 total++;
54 if (PageReserved(page))
55 reserved++;
56 else if (PageSwapCache(page))
57 cached++;
58 else if (PageSlab(page))
59 slab++;
60 else if (!page_count(page))
61 free++;
62 else
63 shared += page_count(page) - 1;
64 page++;
65 } while (page < end);
68 printk ("%d pages of RAM\n", total);
69 printk ("%d free pages\n", free);
70 printk ("%d reserved pages\n", reserved);
71 printk ("%d slab pages\n", slab);
72 printk ("%d pages shared\n", shared);
73 printk ("%d pages swap cached\n", cached);
77 * paging_init() sets up the page tables
79 * This routine also unmaps the page at virtual kernel address 0, so
80 * that we can trap those pesky NULL-reference errors in the kernel.
82 void __init paging_init(void)
84 extern unsigned long _evba;
85 void *zero_page;
86 int nid;
89 * Make sure we can handle exceptions before enabling
90 * paging. Not that we should ever _get_ any exceptions this
91 * early, but you never know...
93 printk("Exception vectors start at %p\n", &_evba);
94 sysreg_write(EVBA, (unsigned long)&_evba);
97 * Since we are ready to handle exceptions now, we should let
98 * the CPU generate them...
100 __asm__ __volatile__ ("csrf %0" : : "i"(SR_EM_BIT));
103 * Allocate the zero page. The allocator will panic if it
104 * can't satisfy the request, so no need to check.
106 zero_page = alloc_bootmem_low_pages_node(NODE_DATA(0),
107 PAGE_SIZE);
110 pgd_t *pg_dir;
111 int i;
113 pg_dir = swapper_pg_dir;
114 sysreg_write(PTBR, (unsigned long)pg_dir);
116 for (i = 0; i < PTRS_PER_PGD; i++)
117 pgd_val(pg_dir[i]) = 0;
119 enable_mmu();
120 printk ("CPU: Paging enabled\n");
123 for_each_online_node(nid) {
124 pg_data_t *pgdat = NODE_DATA(nid);
125 unsigned long zones_size[MAX_NR_ZONES];
126 unsigned long low, start_pfn;
128 start_pfn = pgdat->bdata->node_boot_start;
129 start_pfn >>= PAGE_SHIFT;
130 low = pgdat->bdata->node_low_pfn;
132 memset(zones_size, 0, sizeof(zones_size));
133 zones_size[ZONE_NORMAL] = low - start_pfn;
135 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
136 nid, start_pfn, low);
138 free_area_init_node(nid, pgdat, zones_size, start_pfn, NULL);
140 printk("Node %u: mem_map starts at %p\n",
141 pgdat->node_id, pgdat->node_mem_map);
144 mem_map = NODE_DATA(0)->node_mem_map;
146 memset(zero_page, 0, PAGE_SIZE);
147 empty_zero_page = virt_to_page(zero_page);
148 flush_dcache_page(empty_zero_page);
151 void __init mem_init(void)
153 int codesize, reservedpages, datasize, initsize;
154 int nid, i;
156 reservedpages = 0;
157 high_memory = NULL;
159 /* this will put all low memory onto the freelists */
160 for_each_online_node(nid) {
161 pg_data_t *pgdat = NODE_DATA(nid);
162 unsigned long node_pages = 0;
163 void *node_high_memory;
165 num_physpages += pgdat->node_present_pages;
167 if (pgdat->node_spanned_pages != 0)
168 node_pages = free_all_bootmem_node(pgdat);
170 totalram_pages += node_pages;
172 for (i = 0; i < node_pages; i++)
173 if (PageReserved(pgdat->node_mem_map + i))
174 reservedpages++;
176 node_high_memory = (void *)((pgdat->node_start_pfn
177 + pgdat->node_spanned_pages)
178 << PAGE_SHIFT);
179 if (node_high_memory > high_memory)
180 high_memory = node_high_memory;
183 max_mapnr = MAP_NR(high_memory);
185 codesize = (unsigned long)_etext - (unsigned long)_text;
186 datasize = (unsigned long)_edata - (unsigned long)_data;
187 initsize = (unsigned long)__init_end - (unsigned long)__init_begin;
189 printk ("Memory: %luk/%luk available (%dk kernel code, "
190 "%dk reserved, %dk data, %dk init)\n",
191 (unsigned long)nr_free_pages() << (PAGE_SHIFT - 10),
192 totalram_pages << (PAGE_SHIFT - 10),
193 codesize >> 10,
194 reservedpages << (PAGE_SHIFT - 10),
195 datasize >> 10,
196 initsize >> 10);
199 static inline void free_area(unsigned long addr, unsigned long end, char *s)
201 unsigned int size = (end - addr) >> 10;
203 for (; addr < end; addr += PAGE_SIZE) {
204 struct page *page = virt_to_page(addr);
205 ClearPageReserved(page);
206 init_page_count(page);
207 free_page(addr);
208 totalram_pages++;
211 if (size && s)
212 printk(KERN_INFO "Freeing %s memory: %dK (%lx - %lx)\n",
213 s, size, end - (size << 10), end);
216 void free_initmem(void)
218 free_area((unsigned long)__init_begin, (unsigned long)__init_end,
219 "init");
222 #ifdef CONFIG_BLK_DEV_INITRD
224 void free_initrd_mem(unsigned long start, unsigned long end)
226 free_area(start, end, "initrd");
229 #endif