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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 CZ |
20 | #include <linux/bootmem.h> |
21 | #include <linux/swap.h> | |
6656920b CZ |
22 | #include <linux/mman.h> |
23 | #include <linux/nodemask.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/slab.h> | |
3f65ce4d | 26 | |
3f65ce4d | 27 | #include <asm/bootparam.h> |
3f65ce4d | 28 | #include <asm/page.h> |
3f65ce4d CZ |
29 | |
30 | /* References to section boundaries */ | |
31 | ||
32 | extern char _ftext, _etext, _fdata, _edata, _rodata_end; | |
33 | extern char __init_begin, __init_end; | |
34 | ||
35 | /* | |
36 | * mem_reserve(start, end, must_exist) | |
37 | * | |
38 | * Reserve some memory from the memory pool. | |
39 | * | |
40 | * Parameters: | |
41 | * start Start of region, | |
42 | * end End of region, | |
43 | * must_exist Must exist in memory pool. | |
44 | * | |
45 | * Returns: | |
46 | * 0 (memory area couldn't be mapped) | |
47 | * -1 (success) | |
48 | */ | |
49 | ||
50 | int __init mem_reserve(unsigned long start, unsigned long end, int must_exist) | |
51 | { | |
52 | int i; | |
53 | ||
54 | if (start == end) | |
55 | return 0; | |
56 | ||
57 | start = start & PAGE_MASK; | |
58 | end = PAGE_ALIGN(end); | |
59 | ||
60 | for (i = 0; i < sysmem.nr_banks; i++) | |
61 | if (start < sysmem.bank[i].end | |
62 | && end >= sysmem.bank[i].start) | |
63 | break; | |
64 | ||
65 | if (i == sysmem.nr_banks) { | |
66 | if (must_exist) | |
67 | printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) " | |
68 | "not in any region!\n", start, end); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | if (start > sysmem.bank[i].start) { | |
73 | if (end < sysmem.bank[i].end) { | |
74 | /* split entry */ | |
75 | if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) | |
76 | panic("meminfo overflow\n"); | |
77 | sysmem.bank[sysmem.nr_banks].start = end; | |
78 | sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end; | |
79 | sysmem.nr_banks++; | |
80 | } | |
81 | sysmem.bank[i].end = start; | |
82 | } else { | |
83 | if (end < sysmem.bank[i].end) | |
84 | sysmem.bank[i].start = end; | |
85 | else { | |
86 | /* remove entry */ | |
87 | sysmem.nr_banks--; | |
88 | sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start; | |
89 | sysmem.bank[i].end = sysmem.bank[sysmem.nr_banks].end; | |
90 | } | |
91 | } | |
92 | return -1; | |
93 | } | |
94 | ||
95 | ||
96 | /* | |
97 | * Initialize the bootmem system and give it all the memory we have available. | |
98 | */ | |
99 | ||
100 | void __init bootmem_init(void) | |
101 | { | |
102 | unsigned long pfn; | |
103 | unsigned long bootmap_start, bootmap_size; | |
104 | int i; | |
105 | ||
106 | max_low_pfn = max_pfn = 0; | |
107 | min_low_pfn = ~0; | |
108 | ||
109 | for (i=0; i < sysmem.nr_banks; i++) { | |
110 | pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT; | |
111 | if (pfn < min_low_pfn) | |
112 | min_low_pfn = pfn; | |
113 | pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT; | |
114 | if (pfn > max_pfn) | |
115 | max_pfn = pfn; | |
116 | } | |
117 | ||
118 | if (min_low_pfn > max_pfn) | |
119 | panic("No memory found!\n"); | |
120 | ||
173d6681 CZ |
121 | max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ? |
122 | max_pfn : MAX_MEM_PFN >> PAGE_SHIFT; | |
3f65ce4d CZ |
123 | |
124 | /* Find an area to use for the bootmem bitmap. */ | |
125 | ||
264da9f7 JW |
126 | bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn); |
127 | bootmap_size <<= PAGE_SHIFT; | |
3f65ce4d CZ |
128 | bootmap_start = ~0; |
129 | ||
130 | for (i=0; i<sysmem.nr_banks; i++) | |
131 | if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) { | |
132 | bootmap_start = sysmem.bank[i].start; | |
133 | break; | |
134 | } | |
135 | ||
136 | if (bootmap_start == ~0UL) | |
137 | panic("Cannot find %ld bytes for bootmap\n", bootmap_size); | |
138 | ||
139 | /* Reserve the bootmem bitmap area */ | |
140 | ||
141 | mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1); | |
0bef42e5 | 142 | bootmap_size = init_bootmem_node(NODE_DATA(0), |
3f65ce4d | 143 | bootmap_start >> PAGE_SHIFT, |
0bef42e5 | 144 | min_low_pfn, |
3f65ce4d CZ |
145 | max_low_pfn); |
146 | ||
147 | /* Add all remaining memory pieces into the bootmem map */ | |
148 | ||
149 | for (i=0; i<sysmem.nr_banks; i++) | |
150 | free_bootmem(sysmem.bank[i].start, | |
151 | sysmem.bank[i].end - sysmem.bank[i].start); | |
152 | ||
153 | } | |
154 | ||
155 | ||
e5083a63 | 156 | void __init zones_init(void) |
3f65ce4d CZ |
157 | { |
158 | unsigned long zones_size[MAX_NR_ZONES]; | |
159 | int i; | |
160 | ||
161 | /* All pages are DMA-able, so we put them all in the DMA zone. */ | |
162 | ||
c947a585 | 163 | zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET; |
3f65ce4d CZ |
164 | for (i = 1; i < MAX_NR_ZONES; i++) |
165 | zones_size[i] = 0; | |
166 | ||
167 | #ifdef CONFIG_HIGHMEM | |
168 | zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn; | |
169 | #endif | |
170 | ||
c947a585 | 171 | free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); |
3f65ce4d CZ |
172 | } |
173 | ||
3f65ce4d CZ |
174 | /* |
175 | * Initialize memory pages. | |
176 | */ | |
177 | ||
178 | void __init mem_init(void) | |
179 | { | |
180 | unsigned long codesize, reservedpages, datasize, initsize; | |
181 | unsigned long highmemsize, tmp, ram; | |
182 | ||
c947a585 JW |
183 | max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET; |
184 | high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); | |
3f65ce4d CZ |
185 | highmemsize = 0; |
186 | ||
288a60cf | 187 | #ifdef CONFIG_HIGHMEM |
3f65ce4d CZ |
188 | #error HIGHGMEM not implemented in init.c |
189 | #endif | |
190 | ||
191 | totalram_pages += free_all_bootmem(); | |
192 | ||
193 | reservedpages = ram = 0; | |
c947a585 | 194 | for (tmp = 0; tmp < max_mapnr; tmp++) { |
3f65ce4d CZ |
195 | ram++; |
196 | if (PageReserved(mem_map+tmp)) | |
197 | reservedpages++; | |
198 | } | |
199 | ||
200 | codesize = (unsigned long) &_etext - (unsigned long) &_ftext; | |
201 | datasize = (unsigned long) &_edata - (unsigned long) &_fdata; | |
202 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
203 | ||
204 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, " | |
205 | "%ldk data, %ldk init %ldk highmem)\n", | |
cc013a88 | 206 | nr_free_pages() << (PAGE_SHIFT-10), |
3f65ce4d CZ |
207 | ram << (PAGE_SHIFT-10), |
208 | codesize >> 10, | |
209 | reservedpages << (PAGE_SHIFT-10), | |
210 | datasize >> 10, | |
211 | initsize >> 10, | |
212 | highmemsize >> 10); | |
213 | } | |
214 | ||
215 | void | |
216 | free_reserved_mem(void *start, void *end) | |
217 | { | |
218 | for (; start < end; start += PAGE_SIZE) { | |
219 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 220 | init_page_count(virt_to_page(start)); |
3f65ce4d CZ |
221 | free_page((unsigned long)start); |
222 | totalram_pages++; | |
223 | } | |
224 | } | |
225 | ||
226 | #ifdef CONFIG_BLK_DEV_INITRD | |
227 | extern int initrd_is_mapped; | |
228 | ||
229 | void free_initrd_mem(unsigned long start, unsigned long end) | |
230 | { | |
231 | if (initrd_is_mapped) { | |
232 | free_reserved_mem((void*)start, (void*)end); | |
233 | printk ("Freeing initrd memory: %ldk freed\n",(end-start)>>10); | |
234 | } | |
235 | } | |
236 | #endif | |
237 | ||
238 | void free_initmem(void) | |
239 | { | |
240 | free_reserved_mem(&__init_begin, &__init_end); | |
241 | printk("Freeing unused kernel memory: %dk freed\n", | |
242 | (&__init_end - &__init_begin) >> 10); | |
243 | } |