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1da177e4 LT |
1 | /* init.c: memory initialisation for FRV |
2 | * | |
3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * Derived from: | |
12 | * - linux/arch/m68knommu/mm/init.c | |
13 | * - Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, Kenneth Albanowski <kjahds@kjahds.com>, | |
14 | * - Copyright (C) 2000 Lineo, Inc. (www.lineo.com) | |
15 | * - linux/arch/m68k/mm/init.c | |
16 | * - Copyright (C) 1995 Hamish Macdonald | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/signal.h> |
20 | #include <linux/sched.h> | |
9164bb4a | 21 | #include <linux/sched/task.h> |
1da177e4 | 22 | #include <linux/pagemap.h> |
5a0e3ad6 | 23 | #include <linux/gfp.h> |
1da177e4 LT |
24 | #include <linux/swap.h> |
25 | #include <linux/mm.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/types.h> | |
29 | #include <linux/bootmem.h> | |
30 | #include <linux/highmem.h> | |
fb56f0f9 | 31 | #include <linux/module.h> |
1da177e4 LT |
32 | |
33 | #include <asm/setup.h> | |
34 | #include <asm/segment.h> | |
35 | #include <asm/page.h> | |
36 | #include <asm/pgtable.h> | |
1da177e4 LT |
37 | #include <asm/mmu_context.h> |
38 | #include <asm/virtconvert.h> | |
39 | #include <asm/sections.h> | |
40 | #include <asm/tlb.h> | |
41 | ||
42 | #undef DEBUG | |
43 | ||
1da177e4 LT |
44 | /* |
45 | * BAD_PAGE is the page that is used for page faults when linux | |
46 | * is out-of-memory. Older versions of linux just did a | |
47 | * do_exit(), but using this instead means there is less risk | |
48 | * for a process dying in kernel mode, possibly leaving a inode | |
49 | * unused etc.. | |
50 | * | |
51 | * BAD_PAGETABLE is the accompanying page-table: it is initialized | |
52 | * to point to BAD_PAGE entries. | |
53 | * | |
54 | * ZERO_PAGE is a special page that is used for zero-initialized | |
55 | * data and COW. | |
56 | */ | |
57 | static unsigned long empty_bad_page_table; | |
58 | static unsigned long empty_bad_page; | |
fb56f0f9 | 59 | |
1da177e4 | 60 | unsigned long empty_zero_page; |
fb56f0f9 | 61 | EXPORT_SYMBOL(empty_zero_page); |
1da177e4 LT |
62 | |
63 | /*****************************************************************************/ | |
1da177e4 LT |
64 | /* |
65 | * paging_init() continues the virtual memory environment setup which | |
66 | * was begun by the code in arch/head.S. | |
67 | * The parameters are pointers to where to stick the starting and ending | |
68 | * addresses of available kernel virtual memory. | |
69 | */ | |
70 | void __init paging_init(void) | |
71 | { | |
f06a9684 | 72 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
1da177e4 LT |
73 | |
74 | /* allocate some pages for kernel housekeeping tasks */ | |
75 | empty_bad_page_table = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); | |
76 | empty_bad_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); | |
77 | empty_zero_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); | |
78 | ||
79 | memset((void *) empty_zero_page, 0, PAGE_SIZE); | |
80 | ||
8080f231 | 81 | #ifdef CONFIG_HIGHMEM |
3f2b73c3 | 82 | if (get_num_physpages() - num_mappedpages) { |
1da177e4 LT |
83 | pgd_t *pge; |
84 | pud_t *pue; | |
85 | pmd_t *pme; | |
86 | ||
87 | pkmap_page_table = alloc_bootmem_pages(PAGE_SIZE); | |
88 | ||
1da177e4 LT |
89 | pge = swapper_pg_dir + pgd_index_k(PKMAP_BASE); |
90 | pue = pud_offset(pge, PKMAP_BASE); | |
91 | pme = pmd_offset(pue, PKMAP_BASE); | |
92 | __set_pmd(pme, virt_to_phys(pkmap_page_table) | _PAGE_TABLE); | |
93 | } | |
94 | #endif | |
95 | ||
96 | /* distribute the allocatable pages across the various zones and pass them to the allocator | |
97 | */ | |
fa642754 | 98 | zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn; |
1da177e4 | 99 | #ifdef CONFIG_HIGHMEM |
3f2b73c3 | 100 | zones_size[ZONE_HIGHMEM] = get_num_physpages() - num_mappedpages; |
1da177e4 LT |
101 | #endif |
102 | ||
103 | free_area_init(zones_size); | |
104 | ||
105 | #ifdef CONFIG_MMU | |
106 | /* initialise init's MMU context */ | |
107 | init_new_context(&init_task, &init_mm); | |
108 | #endif | |
109 | ||
110 | } /* end paging_init() */ | |
111 | ||
112 | /*****************************************************************************/ | |
113 | /* | |
114 | * | |
115 | */ | |
116 | void __init mem_init(void) | |
117 | { | |
3f2b73c3 | 118 | unsigned long code_size = _etext - _stext; |
1da177e4 | 119 | |
0516f884 | 120 | /* this will put all low memory onto the freelists */ |
0c988534 | 121 | free_all_bootmem(); |
3f2b73c3 JL |
122 | #if defined(CONFIG_MMU) && defined(CONFIG_HIGHMEM) |
123 | { | |
124 | unsigned long pfn; | |
1da177e4 | 125 | |
3f2b73c3 JL |
126 | for (pfn = get_num_physpages() - 1; |
127 | pfn >= num_mappedpages; pfn--) | |
128 | free_highmem_page(&mem_map[pfn]); | |
129 | } | |
1da177e4 LT |
130 | #endif |
131 | ||
3f2b73c3 JL |
132 | mem_init_print_info(NULL); |
133 | if (rom_length > 0 && rom_length >= code_size) | |
134 | printk("Memory available: %luKiB/%luKiB ROM\n", | |
135 | (rom_length - code_size) >> 10, rom_length >> 10); | |
1da177e4 LT |
136 | } /* end mem_init() */ |
137 | ||
138 | /*****************************************************************************/ | |
139 | /* | |
140 | * free the memory that was only required for initialisation | |
141 | */ | |
e4fc5a1a | 142 | void free_initmem(void) |
1da177e4 LT |
143 | { |
144 | #if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL) | |
dbe67df4 | 145 | free_initmem_default(-1); |
1da177e4 LT |
146 | #endif |
147 | } /* end free_initmem() */ | |
148 | ||
149 | /*****************************************************************************/ | |
150 | /* | |
151 | * free the initial ramdisk memory | |
152 | */ | |
153 | #ifdef CONFIG_BLK_DEV_INITRD | |
154 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
155 | { | |
dbe67df4 | 156 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
1da177e4 LT |
157 | } /* end free_initrd_mem() */ |
158 | #endif |