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5f97f7f9 HS |
1 | /* |
2 | * Copyright (C) 2004-2006 Atmel Corporation | |
3 | * | |
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 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
5a0e3ad6 | 10 | #include <linux/gfp.h> |
5f97f7f9 HS |
11 | #include <linux/mm.h> |
12 | #include <linux/swap.h> | |
13 | #include <linux/init.h> | |
5f97f7f9 | 14 | #include <linux/mmzone.h> |
8bd8974f | 15 | #include <linux/module.h> |
5f97f7f9 HS |
16 | #include <linux/bootmem.h> |
17 | #include <linux/pagemap.h> | |
5f97f7f9 HS |
18 | #include <linux/nodemask.h> |
19 | ||
20 | #include <asm/page.h> | |
21 | #include <asm/mmu_context.h> | |
22 | #include <asm/tlb.h> | |
23 | #include <asm/io.h> | |
24 | #include <asm/dma.h> | |
25 | #include <asm/setup.h> | |
26 | #include <asm/sections.h> | |
27 | ||
abe1ee3a | 28 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_data; |
5f97f7f9 HS |
29 | |
30 | struct page *empty_zero_page; | |
8bd8974f | 31 | EXPORT_SYMBOL(empty_zero_page); |
5f97f7f9 HS |
32 | |
33 | /* | |
34 | * Cache of MMU context last used. | |
35 | */ | |
36 | unsigned long mmu_context_cache = NO_CONTEXT; | |
37 | ||
5f97f7f9 HS |
38 | /* |
39 | * paging_init() sets up the page tables | |
40 | * | |
41 | * This routine also unmaps the page at virtual kernel address 0, so | |
42 | * that we can trap those pesky NULL-reference errors in the kernel. | |
43 | */ | |
44 | void __init paging_init(void) | |
45 | { | |
46 | extern unsigned long _evba; | |
47 | void *zero_page; | |
48 | int nid; | |
49 | ||
50 | /* | |
51 | * Make sure we can handle exceptions before enabling | |
52 | * paging. Not that we should ever _get_ any exceptions this | |
53 | * early, but you never know... | |
54 | */ | |
55 | printk("Exception vectors start at %p\n", &_evba); | |
56 | sysreg_write(EVBA, (unsigned long)&_evba); | |
57 | ||
58 | /* | |
59 | * Since we are ready to handle exceptions now, we should let | |
60 | * the CPU generate them... | |
61 | */ | |
62 | __asm__ __volatile__ ("csrf %0" : : "i"(SR_EM_BIT)); | |
63 | ||
64 | /* | |
65 | * Allocate the zero page. The allocator will panic if it | |
66 | * can't satisfy the request, so no need to check. | |
67 | */ | |
68 | zero_page = alloc_bootmem_low_pages_node(NODE_DATA(0), | |
69 | PAGE_SIZE); | |
70 | ||
ebe74597 HS |
71 | sysreg_write(PTBR, (unsigned long)swapper_pg_dir); |
72 | enable_mmu(); | |
73 | printk ("CPU: Paging enabled\n"); | |
5f97f7f9 HS |
74 | |
75 | for_each_online_node(nid) { | |
76 | pg_data_t *pgdat = NODE_DATA(nid); | |
77 | unsigned long zones_size[MAX_NR_ZONES]; | |
78 | unsigned long low, start_pfn; | |
79 | ||
3560e249 | 80 | start_pfn = pgdat->bdata->node_min_pfn; |
5f97f7f9 HS |
81 | low = pgdat->bdata->node_low_pfn; |
82 | ||
83 | memset(zones_size, 0, sizeof(zones_size)); | |
84 | zones_size[ZONE_NORMAL] = low - start_pfn; | |
85 | ||
86 | printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", | |
87 | nid, start_pfn, low); | |
88 | ||
9109fb7b | 89 | free_area_init_node(nid, zones_size, start_pfn, NULL); |
5f97f7f9 HS |
90 | |
91 | printk("Node %u: mem_map starts at %p\n", | |
92 | pgdat->node_id, pgdat->node_mem_map); | |
93 | } | |
94 | ||
95 | mem_map = NODE_DATA(0)->node_mem_map; | |
96 | ||
5f97f7f9 HS |
97 | empty_zero_page = virt_to_page(zero_page); |
98 | flush_dcache_page(empty_zero_page); | |
99 | } | |
100 | ||
101 | void __init mem_init(void) | |
102 | { | |
6703bdf6 | 103 | pg_data_t *pgdat; |
5f97f7f9 | 104 | |
5f97f7f9 | 105 | high_memory = NULL; |
ce7549e1 JL |
106 | for_each_online_pgdat(pgdat) |
107 | high_memory = max_t(void *, high_memory, | |
108 | __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); | |
5f97f7f9 | 109 | |
ce7549e1 JL |
110 | set_max_mapnr(MAP_NR(high_memory)); |
111 | free_all_bootmem(); | |
6703bdf6 | 112 | mem_init_print_info(NULL); |
5f97f7f9 HS |
113 | } |
114 | ||
5f97f7f9 HS |
115 | void free_initmem(void) |
116 | { | |
dbe67df4 | 117 | free_initmem_default(-1); |
5f97f7f9 HS |
118 | } |
119 | ||
120 | #ifdef CONFIG_BLK_DEV_INITRD | |
5f97f7f9 HS |
121 | void free_initrd_mem(unsigned long start, unsigned long end) |
122 | { | |
dbe67df4 | 123 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
5f97f7f9 | 124 | } |
5f97f7f9 | 125 | #endif |