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b920de1b DH |
1 | /* MN10300 Memory management initialisation |
2 | * | |
3 | * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * Modified by David Howells (dhowells@redhat.com) | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public Licence | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the Licence, or (at your option) any later version. | |
11 | */ | |
12 | #include <linux/signal.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/ptrace.h> | |
19 | #include <linux/mman.h> | |
b920de1b DH |
20 | #include <linux/fs.h> |
21 | #include <linux/mm.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/initrd.h> | |
26 | #include <linux/highmem.h> | |
27 | #include <linux/pagemap.h> | |
28 | #include <linux/bootmem.h> | |
5a0e3ad6 | 29 | #include <linux/gfp.h> |
b920de1b DH |
30 | |
31 | #include <asm/processor.h> | |
32 | #include <asm/system.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <asm/pgtable.h> | |
35 | #include <asm/pgalloc.h> | |
36 | #include <asm/dma.h> | |
37 | #include <asm/tlb.h> | |
38 | #include <asm/sections.h> | |
39 | ||
40 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
41 | ||
42 | unsigned long highstart_pfn, highend_pfn; | |
43 | ||
44 | /* | |
45 | * set up paging | |
46 | */ | |
47 | void __init paging_init(void) | |
48 | { | |
49 | unsigned long zones_size[MAX_NR_ZONES] = {0,}; | |
50 | pte_t *ppte; | |
51 | int loop; | |
52 | ||
53 | /* main kernel space -> RAM mapping is handled as 1:1 transparent by | |
54 | * the MMU */ | |
55 | memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); | |
56 | memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes)); | |
57 | ||
58 | /* load the VMALLOC area PTE table addresses into the kernel PGD */ | |
59 | ppte = kernel_vmalloc_ptes; | |
60 | for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE); | |
61 | loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE); | |
62 | loop++ | |
63 | ) { | |
64 | set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE)); | |
65 | ppte += PAGE_SIZE / sizeof(pte_t); | |
66 | } | |
67 | ||
68 | /* declare the sizes of the RAM zones (only use the normal zone) */ | |
69 | zones_size[ZONE_NORMAL] = | |
3560e249 JW |
70 | contig_page_data.bdata->node_low_pfn - |
71 | contig_page_data.bdata->node_min_pfn; | |
b920de1b DH |
72 | |
73 | /* pass the memory from the bootmem allocator to the main allocator */ | |
74 | free_area_init(zones_size); | |
75 | ||
76 | __flush_tlb_all(); | |
77 | } | |
78 | ||
79 | /* | |
80 | * transfer all the memory from the bootmem allocator to the runtime allocator | |
81 | */ | |
82 | void __init mem_init(void) | |
83 | { | |
84 | int codesize, reservedpages, datasize, initsize; | |
85 | int tmp; | |
86 | ||
87 | if (!mem_map) | |
88 | BUG(); | |
89 | ||
3560e249 | 90 | #define START_PFN (contig_page_data.bdata->node_min_pfn) |
b920de1b DH |
91 | #define MAX_LOW_PFN (contig_page_data.bdata->node_low_pfn) |
92 | ||
93 | max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN; | |
94 | high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE); | |
95 | ||
96 | /* clear the zero-page */ | |
97 | memset(empty_zero_page, 0, PAGE_SIZE); | |
98 | ||
99 | /* this will put all low memory onto the freelists */ | |
100 | totalram_pages += free_all_bootmem(); | |
101 | ||
102 | reservedpages = 0; | |
103 | for (tmp = 0; tmp < num_physpages; tmp++) | |
104 | if (PageReserved(&mem_map[tmp])) | |
105 | reservedpages++; | |
106 | ||
107 | codesize = (unsigned long) &_etext - (unsigned long) &_stext; | |
108 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
109 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
110 | ||
111 | printk(KERN_INFO | |
112 | "Memory: %luk/%luk available" | |
113 | " (%dk kernel code, %dk reserved, %dk data, %dk init," | |
114 | " %ldk highmem)\n", | |
cc013a88 | 115 | nr_free_pages() << (PAGE_SHIFT - 10), |
b920de1b DH |
116 | max_mapnr << (PAGE_SHIFT - 10), |
117 | codesize >> 10, | |
118 | reservedpages << (PAGE_SHIFT - 10), | |
119 | datasize >> 10, | |
120 | initsize >> 10, | |
4b529401 | 121 | totalhigh_pages << (PAGE_SHIFT - 10)); |
b920de1b DH |
122 | } |
123 | ||
124 | /* | |
125 | * | |
126 | */ | |
127 | void free_init_pages(char *what, unsigned long begin, unsigned long end) | |
128 | { | |
129 | unsigned long addr; | |
130 | ||
131 | for (addr = begin; addr < end; addr += PAGE_SIZE) { | |
132 | ClearPageReserved(virt_to_page(addr)); | |
133 | init_page_count(virt_to_page(addr)); | |
134 | memset((void *) addr, 0xcc, PAGE_SIZE); | |
135 | free_page(addr); | |
136 | totalram_pages++; | |
137 | } | |
138 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); | |
139 | } | |
140 | ||
141 | /* | |
142 | * recycle memory containing stuff only required for initialisation | |
143 | */ | |
144 | void free_initmem(void) | |
145 | { | |
146 | free_init_pages("unused kernel memory", | |
147 | (unsigned long) &__init_begin, | |
148 | (unsigned long) &__init_end); | |
149 | } | |
150 | ||
151 | /* | |
152 | * dispose of the memory on which the initial ramdisk resided | |
153 | */ | |
154 | #ifdef CONFIG_BLK_DEV_INITRD | |
155 | void free_initrd_mem(unsigned long start, unsigned long end) | |
156 | { | |
157 | free_init_pages("initrd memory", start, end); | |
158 | } | |
159 | #endif |