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3f65ce4d CZ |
1 | /* |
2 | * arch/xtensa/mm/init.c | |
3 | * | |
4 | * Derived from MIPS, PPC. | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | * | |
10 | * Copyright (C) 2001 - 2005 Tensilica Inc. | |
11 | * | |
12 | * Chris Zankel <chris@zankel.net> | |
13 | * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> | |
14 | * Marc Gauthier | |
15 | * Kevin Chea | |
16 | */ | |
17 | ||
3f65ce4d CZ |
18 | #include <linux/kernel.h> |
19 | #include <linux/errno.h> | |
3f65ce4d | 20 | #include <linux/bootmem.h> |
5a0e3ad6 | 21 | #include <linux/gfp.h> |
3f65ce4d | 22 | #include <linux/swap.h> |
6656920b CZ |
23 | #include <linux/mman.h> |
24 | #include <linux/nodemask.h> | |
25 | #include <linux/mm.h> | |
3f65ce4d | 26 | |
3f65ce4d | 27 | #include <asm/bootparam.h> |
3f65ce4d | 28 | #include <asm/page.h> |
f022d0fa | 29 | #include <asm/sections.h> |
3f65ce4d CZ |
30 | |
31 | /* | |
32 | * mem_reserve(start, end, must_exist) | |
33 | * | |
34 | * Reserve some memory from the memory pool. | |
35 | * | |
36 | * Parameters: | |
37 | * start Start of region, | |
38 | * end End of region, | |
39 | * must_exist Must exist in memory pool. | |
40 | * | |
41 | * Returns: | |
42 | * 0 (memory area couldn't be mapped) | |
43 | * -1 (success) | |
44 | */ | |
45 | ||
46 | int __init mem_reserve(unsigned long start, unsigned long end, int must_exist) | |
47 | { | |
48 | int i; | |
49 | ||
50 | if (start == end) | |
51 | return 0; | |
52 | ||
53 | start = start & PAGE_MASK; | |
54 | end = PAGE_ALIGN(end); | |
55 | ||
56 | for (i = 0; i < sysmem.nr_banks; i++) | |
57 | if (start < sysmem.bank[i].end | |
58 | && end >= sysmem.bank[i].start) | |
59 | break; | |
60 | ||
61 | if (i == sysmem.nr_banks) { | |
62 | if (must_exist) | |
63 | printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) " | |
64 | "not in any region!\n", start, end); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | if (start > sysmem.bank[i].start) { | |
69 | if (end < sysmem.bank[i].end) { | |
70 | /* split entry */ | |
71 | if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) | |
72 | panic("meminfo overflow\n"); | |
73 | sysmem.bank[sysmem.nr_banks].start = end; | |
74 | sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end; | |
75 | sysmem.nr_banks++; | |
76 | } | |
77 | sysmem.bank[i].end = start; | |
c4c4594b CZ |
78 | |
79 | } else if (end < sysmem.bank[i].end) { | |
80 | sysmem.bank[i].start = end; | |
81 | ||
3f65ce4d | 82 | } else { |
c4c4594b CZ |
83 | /* remove entry */ |
84 | sysmem.nr_banks--; | |
85 | sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start; | |
86 | sysmem.bank[i].end = sysmem.bank[sysmem.nr_banks].end; | |
3f65ce4d CZ |
87 | } |
88 | return -1; | |
89 | } | |
90 | ||
91 | ||
92 | /* | |
e9d6dca5 | 93 | * Initialize the bootmem system and give it all low memory we have available. |
3f65ce4d CZ |
94 | */ |
95 | ||
96 | void __init bootmem_init(void) | |
97 | { | |
98 | unsigned long pfn; | |
99 | unsigned long bootmap_start, bootmap_size; | |
100 | int i; | |
101 | ||
102 | max_low_pfn = max_pfn = 0; | |
103 | min_low_pfn = ~0; | |
104 | ||
105 | for (i=0; i < sysmem.nr_banks; i++) { | |
106 | pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT; | |
107 | if (pfn < min_low_pfn) | |
108 | min_low_pfn = pfn; | |
109 | pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT; | |
110 | if (pfn > max_pfn) | |
111 | max_pfn = pfn; | |
112 | } | |
113 | ||
114 | if (min_low_pfn > max_pfn) | |
115 | panic("No memory found!\n"); | |
116 | ||
173d6681 CZ |
117 | max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ? |
118 | max_pfn : MAX_MEM_PFN >> PAGE_SHIFT; | |
3f65ce4d CZ |
119 | |
120 | /* Find an area to use for the bootmem bitmap. */ | |
121 | ||
264da9f7 JW |
122 | bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn); |
123 | bootmap_size <<= PAGE_SHIFT; | |
3f65ce4d CZ |
124 | bootmap_start = ~0; |
125 | ||
126 | for (i=0; i<sysmem.nr_banks; i++) | |
127 | if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) { | |
128 | bootmap_start = sysmem.bank[i].start; | |
129 | break; | |
130 | } | |
131 | ||
132 | if (bootmap_start == ~0UL) | |
133 | panic("Cannot find %ld bytes for bootmap\n", bootmap_size); | |
134 | ||
135 | /* Reserve the bootmem bitmap area */ | |
136 | ||
137 | mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1); | |
0bef42e5 | 138 | bootmap_size = init_bootmem_node(NODE_DATA(0), |
3f65ce4d | 139 | bootmap_start >> PAGE_SHIFT, |
0bef42e5 | 140 | min_low_pfn, |
3f65ce4d CZ |
141 | max_low_pfn); |
142 | ||
143 | /* Add all remaining memory pieces into the bootmem map */ | |
144 | ||
e9d6dca5 MF |
145 | for (i = 0; i < sysmem.nr_banks; i++) { |
146 | if (sysmem.bank[i].start >> PAGE_SHIFT < max_low_pfn) { | |
147 | unsigned long end = min(max_low_pfn << PAGE_SHIFT, | |
148 | sysmem.bank[i].end); | |
149 | free_bootmem(sysmem.bank[i].start, | |
150 | end - sysmem.bank[i].start); | |
151 | } | |
152 | } | |
3f65ce4d CZ |
153 | |
154 | } | |
155 | ||
156 | ||
e5083a63 | 157 | void __init zones_init(void) |
3f65ce4d CZ |
158 | { |
159 | unsigned long zones_size[MAX_NR_ZONES]; | |
160 | int i; | |
161 | ||
162 | /* All pages are DMA-able, so we put them all in the DMA zone. */ | |
163 | ||
c947a585 | 164 | zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET; |
3f65ce4d CZ |
165 | for (i = 1; i < MAX_NR_ZONES; i++) |
166 | zones_size[i] = 0; | |
167 | ||
168 | #ifdef CONFIG_HIGHMEM | |
169 | zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn; | |
170 | #endif | |
171 | ||
c947a585 | 172 | free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); |
3f65ce4d CZ |
173 | } |
174 | ||
3f65ce4d CZ |
175 | /* |
176 | * Initialize memory pages. | |
177 | */ | |
178 | ||
179 | void __init mem_init(void) | |
180 | { | |
808c2c37 | 181 | max_mapnr = max_low_pfn - ARCH_PFN_OFFSET; |
c947a585 | 182 | high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); |
3f65ce4d | 183 | |
288a60cf | 184 | #ifdef CONFIG_HIGHMEM |
3f65ce4d CZ |
185 | #error HIGHGMEM not implemented in init.c |
186 | #endif | |
187 | ||
0c988534 | 188 | free_all_bootmem(); |
3f65ce4d | 189 | |
808c2c37 | 190 | mem_init_print_info(NULL); |
3f65ce4d CZ |
191 | } |
192 | ||
3f65ce4d CZ |
193 | #ifdef CONFIG_BLK_DEV_INITRD |
194 | extern int initrd_is_mapped; | |
195 | ||
196 | void free_initrd_mem(unsigned long start, unsigned long end) | |
197 | { | |
7acb2c2e | 198 | if (initrd_is_mapped) |
dbe67df4 | 199 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
3f65ce4d CZ |
200 | } |
201 | #endif | |
202 | ||
203 | void free_initmem(void) | |
204 | { | |
dbe67df4 | 205 | free_initmem_default(-1); |
3f65ce4d | 206 | } |