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-rw-r--r--arch/sh64/mm/init.c189
1 files changed, 0 insertions, 189 deletions
diff --git a/arch/sh64/mm/init.c b/arch/sh64/mm/init.c
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index 21cf42de23e2..000000000000
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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * arch/sh64/mm/init.c
7 *
8 * Copyright (C) 2000, 2001 Paolo Alberelli
9 * Copyright (C) 2003, 2004 Paul Mundt
10 *
11 */
12
13#include <linux/init.h>
14#include <linux/rwsem.h>
15#include <linux/mm.h>
16#include <linux/swap.h>
17#include <linux/bootmem.h>
18
19#include <asm/mmu_context.h>
20#include <asm/page.h>
21#include <asm/pgalloc.h>
22#include <asm/pgtable.h>
23#include <asm/tlb.h>
24
25DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
26
27/*
28 * Cache of MMU context last used.
29 */
30unsigned long mmu_context_cache;
31pgd_t * mmu_pdtp_cache;
32int after_bootmem = 0;
33
34/*
35 * BAD_PAGE is the page that is used for page faults when linux
36 * is out-of-memory. Older versions of linux just did a
37 * do_exit(), but using this instead means there is less risk
38 * for a process dying in kernel mode, possibly leaving an inode
39 * unused etc..
40 *
41 * BAD_PAGETABLE is the accompanying page-table: it is initialized
42 * to point to BAD_PAGE entries.
43 *
44 * ZERO_PAGE is a special page that is used for zero-initialized
45 * data and COW.
46 */
47
48extern unsigned char empty_zero_page[PAGE_SIZE];
49extern unsigned char empty_bad_page[PAGE_SIZE];
50extern pte_t empty_bad_pte_table[PTRS_PER_PTE];
51extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
52
53extern char _text, _etext, _edata, __bss_start, _end;
54extern char __init_begin, __init_end;
55
56/* It'd be good if these lines were in the standard header file. */
57#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
58#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)
59
60
61void show_mem(void)
62{
63 int i, total = 0, reserved = 0;
64 int shared = 0, cached = 0;
65
66 printk("Mem-info:\n");
67 show_free_areas();
68 printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
69 i = max_mapnr;
70 while (i-- > 0) {
71 total++;
72 if (PageReserved(mem_map+i))
73 reserved++;
74 else if (PageSwapCache(mem_map+i))
75 cached++;
76 else if (page_count(mem_map+i))
77 shared += page_count(mem_map+i) - 1;
78 }
79 printk("%d pages of RAM\n",total);
80 printk("%d reserved pages\n",reserved);
81 printk("%d pages shared\n",shared);
82 printk("%d pages swap cached\n",cached);
83 printk("%ld pages in page table cache\n", quicklist_total_size());
84}
85
86/*
87 * paging_init() sets up the page tables.
88 *
89 * head.S already did a lot to set up address translation for the kernel.
90 * Here we comes with:
91 * . MMU enabled
92 * . ASID set (SR)
93 * . some 512MB regions being mapped of which the most relevant here is:
94 * . CACHED segment (ASID 0 [irrelevant], shared AND NOT user)
95 * . possible variable length regions being mapped as:
96 * . UNCACHED segment (ASID 0 [irrelevant], shared AND NOT user)
97 * . All of the memory regions are placed, independently from the platform
98 * on high addresses, above 0x80000000.
99 * . swapper_pg_dir is already cleared out by the .space directive
100 * in any case swapper does not require a real page directory since
101 * it's all kernel contained.
102 *
103 * Those pesky NULL-reference errors in the kernel are then
104 * dealt with by not mapping address 0x00000000 at all.
105 *
106 */
107void __init paging_init(void)
108{
109 unsigned long zones_size[MAX_NR_ZONES] = {0, };
110
111 pgd_init((unsigned long)swapper_pg_dir);
112 pgd_init((unsigned long)swapper_pg_dir +
113 sizeof(pgd_t) * USER_PTRS_PER_PGD);
114
115 mmu_context_cache = MMU_CONTEXT_FIRST_VERSION;
116
117 zones_size[ZONE_NORMAL] = MAX_LOW_PFN - START_PFN;
118 NODE_DATA(0)->node_mem_map = NULL;
119 free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
120}
121
122void __init mem_init(void)
123{
124 int codesize, reservedpages, datasize, initsize;
125 int tmp;
126
127 max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN;
128 high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);
129
130 /*
131 * Clear the zero-page.
132 * This is not required but we might want to re-use
133 * this very page to pass boot parameters, one day.
134 */
135 memset(empty_zero_page, 0, PAGE_SIZE);
136
137 /* this will put all low memory onto the freelists */
138 totalram_pages += free_all_bootmem_node(NODE_DATA(0));
139 reservedpages = 0;
140 for (tmp = 0; tmp < num_physpages; tmp++)
141 /*
142 * Only count reserved RAM pages
143 */
144 if (PageReserved(mem_map+tmp))
145 reservedpages++;
146
147 after_bootmem = 1;
148
149 codesize = (unsigned long) &_etext - (unsigned long) &_text;
150 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
151 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
152
153 printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
154 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
155 max_mapnr << (PAGE_SHIFT-10),
156 codesize >> 10,
157 reservedpages << (PAGE_SHIFT-10),
158 datasize >> 10,
159 initsize >> 10);
160}
161
162void free_initmem(void)
163{
164 unsigned long addr;
165
166 addr = (unsigned long)(&__init_begin);
167 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
168 ClearPageReserved(virt_to_page(addr));
169 init_page_count(virt_to_page(addr));
170 free_page(addr);
171 totalram_pages++;
172 }
173 printk ("Freeing unused kernel memory: %ldk freed\n", (&__init_end - &__init_begin) >> 10);
174}
175
176#ifdef CONFIG_BLK_DEV_INITRD
177void free_initrd_mem(unsigned long start, unsigned long end)
178{
179 unsigned long p;
180 for (p = start; p < end; p += PAGE_SIZE) {
181 ClearPageReserved(virt_to_page(p));
182 init_page_count(virt_to_page(p));
183 free_page(p);
184 totalram_pages++;
185 }
186 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
187}
188#endif
189
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