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Paul Mundt01066622007-03-28 16:38:13 +09001/*
2 * linux/arch/sh/mm/init.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 1999 Niibe Yutaka
Paul Mundt01066622007-03-28 16:38:13 +09005 * Copyright (C) 2002 - 2007 Paul Mundt
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * Based on linux/arch/i386/mm/init.c:
8 * Copyright (C) 1995 Linus Torvalds
9 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/mm.h>
11#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/bootmem.h>
Paul Mundt2cb7ce32006-09-27 18:20:58 +090014#include <linux/proc_fs.h>
Paul Mundt27641de2007-05-14 10:48:01 +090015#include <linux/pagemap.h>
Paul Mundt01066622007-03-28 16:38:13 +090016#include <linux/percpu.h>
17#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <asm/mmu_context.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <asm/tlb.h>
20#include <asm/cacheflush.h>
Paul Mundt07cbb412007-06-06 12:23:06 +090021#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <asm/cache.h>
23
24DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
25pgd_t swapper_pg_dir[PTRS_PER_PGD];
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027void (*copy_page)(void *from, void *to);
28void (*clear_page)(void *to);
29
30void show_mem(void)
31{
Paul Mundt01066622007-03-28 16:38:13 +090032 int total = 0, reserved = 0, free = 0;
33 int shared = 0, cached = 0, slab = 0;
34 pg_data_t *pgdat;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36 printk("Mem-info:\n");
37 show_free_areas();
Paul Mundt01066622007-03-28 16:38:13 +090038
39 for_each_online_pgdat(pgdat) {
Paul Mundtdfbb9042007-05-23 17:48:36 +090040 unsigned long flags, i;
Paul Mundt01066622007-03-28 16:38:13 +090041
42 pgdat_resize_lock(pgdat, &flags);
Paul Mundtdfbb9042007-05-23 17:48:36 +090043 for (i = 0; i < pgdat->node_spanned_pages; i++) {
44 struct page *page = pgdat_page_nr(pgdat, i);
Paul Mundt01066622007-03-28 16:38:13 +090045 total++;
46 if (PageReserved(page))
47 reserved++;
48 else if (PageSwapCache(page))
49 cached++;
50 else if (PageSlab(page))
51 slab++;
52 else if (!page_count(page))
53 free++;
54 else
55 shared += page_count(page) - 1;
Paul Mundtdfbb9042007-05-23 17:48:36 +090056 }
Paul Mundt01066622007-03-28 16:38:13 +090057 pgdat_resize_unlock(pgdat, &flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 }
Paul Mundt01066622007-03-28 16:38:13 +090059
60 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
61 printk("%d pages of RAM\n", total);
62 printk("%d free pages\n", free);
63 printk("%d reserved pages\n", reserved);
64 printk("%d slab pages\n", slab);
65 printk("%d pages shared\n", shared);
66 printk("%d pages swap cached\n", cached);
Paul Mundt5f8c9902007-05-08 11:55:21 +090067 printk(KERN_INFO "Total of %ld pages in page table cache\n",
68 quicklist_total_size());
Linus Torvalds1da177e2005-04-16 15:20:36 -070069}
70
Yoshinori Sato11cbb702006-12-07 18:07:27 +090071#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -070072static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
73{
74 pgd_t *pgd;
Paul Mundt26ff6c12006-09-27 15:13:36 +090075 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 pmd_t *pmd;
77 pte_t *pte;
78
Stuart Menefy99a596f2006-11-21 15:38:05 +090079 pgd = pgd_offset_k(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 if (pgd_none(*pgd)) {
81 pgd_ERROR(*pgd);
82 return;
83 }
84
Stuart Menefy99a596f2006-11-21 15:38:05 +090085 pud = pud_alloc(NULL, pgd, addr);
86 if (unlikely(!pud)) {
87 pud_ERROR(*pud);
88 return;
Paul Mundt26ff6c12006-09-27 15:13:36 +090089 }
90
Stuart Menefy99a596f2006-11-21 15:38:05 +090091 pmd = pmd_alloc(NULL, pud, addr);
92 if (unlikely(!pmd)) {
93 pmd_ERROR(*pmd);
94 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 }
96
97 pte = pte_offset_kernel(pmd, addr);
98 if (!pte_none(*pte)) {
99 pte_ERROR(*pte);
100 return;
101 }
102
103 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
104
Paul Mundtea9af692006-12-25 19:28:54 +0900105 flush_tlb_one(get_asid(), addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
108/*
109 * As a performance optimization, other platforms preserve the fixmap mapping
110 * across a context switch, we don't presently do this, but this could be done
111 * in a similar fashion as to the wired TLB interface that sh64 uses (by way
Simon Arlotte868d612007-05-14 08:15:10 +0900112 * of the memory mapped UTLB configuration) -- this unfortunately forces us to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 * give up a TLB entry for each mapping we want to preserve. While this may be
114 * viable for a small number of fixmaps, it's not particularly useful for
115 * everything and needs to be carefully evaluated. (ie, we may want this for
116 * the vsyscall page).
117 *
118 * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
119 * in at __set_fixmap() time to determine the appropriate behavior to follow.
120 *
121 * -- PFM.
122 */
123void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
124{
125 unsigned long address = __fix_to_virt(idx);
126
127 if (idx >= __end_of_fixed_addresses) {
128 BUG();
129 return;
130 }
131
132 set_pte_phys(address, phys, prot);
133}
Yoshinori Sato11cbb702006-12-07 18:07:27 +0900134#endif /* CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136/*
137 * paging_init() sets up the page tables
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 */
139void __init paging_init(void)
140{
Paul Mundt2de212e2007-06-06 12:09:54 +0900141 unsigned long max_zone_pfns[MAX_NR_ZONES];
Paul Mundt01066622007-03-28 16:38:13 +0900142 int nid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Paul Mundt01066622007-03-28 16:38:13 +0900144 /* We don't need to map the kernel through the TLB, as
145 * it is permanatly mapped using P1. So clear the
146 * entire pgd. */
147 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Stuart Menefy6e4662f2006-11-21 13:53:44 +0900149 /* Set an initial value for the MMU.TTB so we don't have to
150 * check for a null value. */
151 set_TTB(swapper_pg_dir);
152
Paul Mundt2de212e2007-06-06 12:09:54 +0900153 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
154
Paul Mundt01066622007-03-28 16:38:13 +0900155 for_each_online_node(nid) {
156 pg_data_t *pgdat = NODE_DATA(nid);
Paul Mundt01066622007-03-28 16:38:13 +0900157 unsigned long low, start_pfn;
158
Paul Mundt01066622007-03-28 16:38:13 +0900159 start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT;
160 low = pgdat->bdata->node_low_pfn;
161
Paul Mundt2de212e2007-06-06 12:09:54 +0900162 if (max_zone_pfns[ZONE_NORMAL] < low)
163 max_zone_pfns[ZONE_NORMAL] = low;
Paul Mundt01066622007-03-28 16:38:13 +0900164
165 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
166 nid, start_pfn, low);
Paul Mundt01066622007-03-28 16:38:13 +0900167 }
Paul Mundt2de212e2007-06-06 12:09:54 +0900168
169 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
Paul Mundt2cb7ce32006-09-27 18:20:58 +0900172static struct kcore_list kcore_mem, kcore_vmalloc;
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174void __init mem_init(void)
175{
Paul Mundtdfbb9042007-05-23 17:48:36 +0900176 int codesize, datasize, initsize;
Paul Mundt01066622007-03-28 16:38:13 +0900177 int nid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Paul Mundt2de212e2007-06-06 12:09:54 +0900179 num_physpages = 0;
180 high_memory = NULL;
181
Paul Mundt01066622007-03-28 16:38:13 +0900182 for_each_online_node(nid) {
183 pg_data_t *pgdat = NODE_DATA(nid);
184 unsigned long node_pages = 0;
185 void *node_high_memory;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Paul Mundt01066622007-03-28 16:38:13 +0900187 num_physpages += pgdat->node_present_pages;
188
189 if (pgdat->node_spanned_pages)
190 node_pages = free_all_bootmem_node(pgdat);
191
192 totalram_pages += node_pages;
193
Paul Mundt2de212e2007-06-06 12:09:54 +0900194 node_high_memory = (void *)__va((pgdat->node_start_pfn +
195 pgdat->node_spanned_pages) <<
196 PAGE_SHIFT);
Paul Mundt01066622007-03-28 16:38:13 +0900197 if (node_high_memory > high_memory)
198 high_memory = node_high_memory;
199 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 /* clear the zero-page */
202 memset(empty_zero_page, 0, PAGE_SIZE);
203 __flush_wback_region(empty_zero_page, PAGE_SIZE);
204
Paul Mundt65463b72005-11-07 00:58:24 -0800205 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 * Setup wrappers for copy/clear_page(), these will get overridden
207 * later in the boot process if a better method is available.
208 */
Yoshinori Satoe96636c2006-09-27 17:21:02 +0900209#ifdef CONFIG_MMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 copy_page = copy_page_slow;
211 clear_page = clear_page_slow;
Yoshinori Satoe96636c2006-09-27 17:21:02 +0900212#else
213 copy_page = copy_page_nommu;
214 clear_page = clear_page_nommu;
215#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 codesize = (unsigned long) &_etext - (unsigned long) &_text;
218 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
219 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
220
Paul Mundt2cb7ce32006-09-27 18:20:58 +0900221 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
222 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
223 VMALLOC_END - VMALLOC_START);
224
225 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
Paul Mundtdfbb9042007-05-23 17:48:36 +0900226 "%dk data, %dk init)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
Paul Mundt2de212e2007-06-06 12:09:54 +0900228 num_physpages << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 codesize >> 10,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 datasize >> 10,
231 initsize >> 10);
232
233 p3_cache_init();
Paul Mundt19f9a342006-09-27 18:33:49 +0900234
235 /* Initialize the vDSO */
236 vsyscall_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239void free_initmem(void)
240{
241 unsigned long addr;
Paul Mundt65463b72005-11-07 00:58:24 -0800242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 addr = (unsigned long)(&__init_begin);
244 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
245 ClearPageReserved(virt_to_page(addr));
Nick Piggin7835e982006-03-22 00:08:40 -0800246 init_page_count(virt_to_page(addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 free_page(addr);
248 totalram_pages++;
249 }
Paul Mundt07cbb412007-06-06 12:23:06 +0900250 printk("Freeing unused kernel memory: %ldk freed\n",
251 ((unsigned long)&__init_end -
252 (unsigned long)&__init_begin) >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
255#ifdef CONFIG_BLK_DEV_INITRD
256void free_initrd_mem(unsigned long start, unsigned long end)
257{
258 unsigned long p;
259 for (p = start; p < end; p += PAGE_SIZE) {
260 ClearPageReserved(virt_to_page(p));
Nick Piggin7835e982006-03-22 00:08:40 -0800261 init_page_count(virt_to_page(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 free_page(p);
263 totalram_pages++;
264 }
Paul Mundt2de212e2007-06-06 12:09:54 +0900265 printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
267#endif