Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/m68knommu/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, | |
5 | * Kenneth Albanowski <kjahds@kjahds.com>, | |
6 | * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) | |
7 | * | |
8 | * Based on: | |
9 | * | |
10 | * linux/arch/m68k/mm/init.c | |
11 | * | |
12 | * Copyright (C) 1995 Hamish Macdonald | |
13 | * | |
14 | * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com) | |
15 | * DEC/2000 -- linux 2.4 support <davidm@snapgear.com> | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/signal.h> |
19 | #include <linux/sched.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/mman.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/swap.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/highmem.h> | |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/bootmem.h> | |
5a0e3ad6 | 32 | #include <linux/gfp.h> |
1da177e4 LT |
33 | |
34 | #include <asm/setup.h> | |
9da48c01 | 35 | #include <asm/sections.h> |
1da177e4 LT |
36 | #include <asm/segment.h> |
37 | #include <asm/page.h> | |
38 | #include <asm/pgtable.h> | |
1da177e4 LT |
39 | #include <asm/machdep.h> |
40 | ||
1da177e4 | 41 | /* |
1da177e4 LT |
42 | * ZERO_PAGE is a special page that is used for zero-initialized |
43 | * data and COW. | |
44 | */ | |
45d1564c | 45 | void *empty_zero_page; |
1da177e4 | 46 | |
1da177e4 LT |
47 | /* |
48 | * paging_init() continues the virtual memory environment setup which | |
49 | * was begun by the code in arch/head.S. | |
50 | * The parameters are pointers to where to stick the starting and ending | |
51 | * addresses of available kernel virtual memory. | |
52 | */ | |
f386c3cc | 53 | void __init paging_init(void) |
1da177e4 LT |
54 | { |
55 | /* | |
56 | * Make sure start_mem is page aligned, otherwise bootmem and | |
57 | * page_alloc get different views of the world. | |
58 | */ | |
1da177e4 | 59 | unsigned long end_mem = memory_end & PAGE_MASK; |
b1ffa259 | 60 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
1da177e4 | 61 | |
45d1564c GU |
62 | empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); |
63 | memset(empty_zero_page, 0, PAGE_SIZE); | |
1da177e4 LT |
64 | |
65 | /* | |
66 | * Set up SFC/DFC registers (user data space). | |
67 | */ | |
68 | set_fs (USER_DS); | |
69 | ||
b1ffa259 GU |
70 | zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; |
71 | free_area_init(zones_size); | |
1da177e4 LT |
72 | } |
73 | ||
f386c3cc | 74 | void __init mem_init(void) |
1da177e4 LT |
75 | { |
76 | int codek = 0, datak = 0, initk = 0; | |
77 | unsigned long tmp; | |
1da177e4 LT |
78 | unsigned long len = _ramend - _rambase; |
79 | unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */ | |
80 | unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */ | |
81 | ||
308e610e | 82 | pr_debug("Mem_init: start=%lx, end=%lx\n", start_mem, end_mem); |
1da177e4 LT |
83 | |
84 | end_mem &= PAGE_MASK; | |
85 | high_memory = (void *) end_mem; | |
86 | ||
87 | start_mem = PAGE_ALIGN(start_mem); | |
88 | max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT; | |
89 | ||
90 | /* this will put all memory onto the freelists */ | |
91 | totalram_pages = free_all_bootmem(); | |
92 | ||
9da48c01 | 93 | codek = (_etext - _stext) >> 10; |
dc061051 | 94 | datak = (__bss_stop - _sdata) >> 10; |
9da48c01 | 95 | initk = (__init_begin - __init_end) >> 10; |
1da177e4 LT |
96 | |
97 | tmp = nr_free_pages() << PAGE_SHIFT; | |
2082b477 | 98 | printk(KERN_INFO "Memory available: %luk/%luk RAM, (%dk kernel code, %dk data)\n", |
1da177e4 LT |
99 | tmp >> 10, |
100 | len >> 10, | |
1da177e4 LT |
101 | codek, |
102 | datak | |
103 | ); | |
104 | } | |
105 | ||
106 | ||
107 | #ifdef CONFIG_BLK_DEV_INITRD | |
108 | void free_initrd_mem(unsigned long start, unsigned long end) | |
109 | { | |
110 | int pages = 0; | |
111 | for (; start < end; start += PAGE_SIZE) { | |
112 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 113 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
114 | free_page(start); |
115 | totalram_pages++; | |
116 | pages++; | |
117 | } | |
6617eaf3 GU |
118 | pr_notice("Freeing initrd memory: %luk freed\n", |
119 | pages * (PAGE_SIZE / 1024)); | |
1da177e4 LT |
120 | } |
121 | #endif | |
122 | ||
b1ffa259 | 123 | void free_initmem(void) |
1da177e4 LT |
124 | { |
125 | #ifdef CONFIG_RAMKERNEL | |
126 | unsigned long addr; | |
1da177e4 LT |
127 | /* |
128 | * The following code should be cool even if these sections | |
129 | * are not page aligned. | |
130 | */ | |
9da48c01 | 131 | addr = PAGE_ALIGN((unsigned long) __init_begin); |
1da177e4 | 132 | /* next to check that the page we free is not a partial page */ |
9da48c01 | 133 | for (; addr + PAGE_SIZE < ((unsigned long) __init_end); addr += PAGE_SIZE) { |
1da177e4 | 134 | ClearPageReserved(virt_to_page(addr)); |
7835e98b | 135 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
136 | free_page(addr); |
137 | totalram_pages++; | |
138 | } | |
6617eaf3 | 139 | pr_notice("Freeing unused kernel memory: %luk freed (0x%x - 0x%x)\n", |
9da48c01 GU |
140 | (addr - PAGE_ALIGN((unsigned long) __init_begin)) >> 10, |
141 | (int)(PAGE_ALIGN((unsigned long) __init_begin)), | |
1da177e4 LT |
142 | (int)(addr - PAGE_SIZE)); |
143 | #endif | |
144 | } | |
145 |