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a95d0e16 MS |
1 | /* |
2 | * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu> | |
3 | * Copyright (C) 2006 Atmark Techno, Inc. | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | */ | |
9 | ||
10 | #include <linux/bootmem.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/lmb.h> | |
14 | #include <linux/mm.h> /* mem_init */ | |
15 | #include <linux/initrd.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/pfn.h> | |
18 | #include <linux/swap.h> | |
19 | ||
20 | #include <asm/page.h> | |
21 | #include <asm/mmu_context.h> | |
22 | #include <asm/pgalloc.h> | |
23 | #include <asm/sections.h> | |
24 | #include <asm/tlb.h> | |
25 | ||
26 | unsigned int __page_offset; | |
5af7fa68 | 27 | EXPORT_SYMBOL(__page_offset); |
a95d0e16 MS |
28 | |
29 | char *klimit = _end; | |
30 | ||
31 | /* | |
32 | * Initialize the bootmem system and give it all the memory we | |
33 | * have available. | |
34 | */ | |
35 | unsigned int memory_start; | |
36 | unsigned int memory_end; /* due to mm/nommu.c */ | |
37 | unsigned int memory_size; | |
38 | ||
39 | /* | |
40 | * paging_init() sets up the page tables - in fact we've already done this. | |
41 | */ | |
42 | static void __init paging_init(void) | |
43 | { | |
a95d0e16 MS |
44 | unsigned long zones_size[MAX_NR_ZONES]; |
45 | ||
5af90438 SM |
46 | /* Clean every zones */ |
47 | memset(zones_size, 0, sizeof(zones_size)); | |
48 | ||
a95d0e16 MS |
49 | /* |
50 | * old: we can DMA to/from any address.put all page into ZONE_DMA | |
51 | * We use only ZONE_NORMAL | |
52 | */ | |
53 | zones_size[ZONE_NORMAL] = max_mapnr; | |
54 | ||
a95d0e16 MS |
55 | free_area_init(zones_size); |
56 | } | |
57 | ||
58 | void __init setup_memory(void) | |
59 | { | |
60 | int i; | |
61 | unsigned long map_size; | |
62 | u32 kernel_align_start, kernel_align_size; | |
63 | ||
64 | /* Find main memory where is the kernel */ | |
65 | for (i = 0; i < lmb.memory.cnt; i++) { | |
66 | memory_start = (u32) lmb.memory.region[i].base; | |
67 | memory_end = (u32) lmb.memory.region[i].base | |
68 | + (u32) lmb.memory.region[i].size; | |
69 | if ((memory_start <= (u32)_text) && | |
70 | ((u32)_text <= memory_end)) { | |
71 | memory_size = memory_end - memory_start; | |
72 | PAGE_OFFSET = memory_start; | |
73 | printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, " | |
74 | "size 0x%08x\n", __func__, memory_start, | |
75 | memory_end, memory_size); | |
76 | break; | |
77 | } | |
78 | } | |
79 | ||
80 | if (!memory_start || !memory_end) { | |
81 | panic("%s: Missing memory setting 0x%08x-0x%08x\n", | |
82 | __func__, memory_start, memory_end); | |
83 | } | |
84 | ||
85 | /* reservation of region where is the kernel */ | |
86 | kernel_align_start = PAGE_DOWN((u32)_text); | |
87 | /* ALIGN can be remove because _end in vmlinux.lds.S is align */ | |
88 | kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start; | |
89 | lmb_reserve(kernel_align_start, kernel_align_size); | |
90 | printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n", | |
91 | __func__, kernel_align_start, kernel_align_start | |
92 | + kernel_align_size, kernel_align_size); | |
93 | ||
94 | /* | |
95 | * Kernel: | |
96 | * start: base phys address of kernel - page align | |
97 | * end: base phys address of kernel - page align | |
98 | * | |
99 | * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) | |
100 | * max_low_pfn | |
101 | * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) | |
102 | * num_physpages - number of all pages | |
103 | */ | |
104 | ||
105 | /* memory start is from the kernel end (aligned) to higher addr */ | |
106 | min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ | |
107 | /* RAM is assumed contiguous */ | |
108 | num_physpages = max_mapnr = memory_size >> PAGE_SHIFT; | |
109 | max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT; | |
110 | ||
111 | printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr); | |
112 | printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); | |
113 | printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); | |
114 | ||
115 | /* | |
116 | * Find an area to use for the bootmem bitmap. | |
117 | * We look for the first area which is at least | |
118 | * 128kB in length (128kB is enough for a bitmap | |
119 | * for 4GB of memory, using 4kB pages), plus 1 page | |
120 | * (in case the address isn't page-aligned). | |
121 | */ | |
122 | map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)), | |
123 | min_low_pfn, max_low_pfn); | |
124 | ||
125 | lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size); | |
126 | ||
127 | /* free bootmem is whole main memory */ | |
128 | free_bootmem(memory_start, memory_size); | |
129 | ||
130 | /* reserve allocate blocks */ | |
131 | for (i = 0; i < lmb.reserved.cnt; i++) { | |
132 | pr_debug("reserved %d - 0x%08x-0x%08x\n", i, | |
133 | (u32) lmb.reserved.region[i].base, | |
134 | (u32) lmb_size_bytes(&lmb.reserved, i)); | |
135 | reserve_bootmem(lmb.reserved.region[i].base, | |
136 | lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT); | |
137 | } | |
138 | paging_init(); | |
139 | } | |
140 | ||
141 | void free_init_pages(char *what, unsigned long begin, unsigned long end) | |
142 | { | |
143 | unsigned long addr; | |
144 | ||
145 | for (addr = begin; addr < end; addr += PAGE_SIZE) { | |
146 | ClearPageReserved(virt_to_page(addr)); | |
147 | init_page_count(virt_to_page(addr)); | |
148 | memset((void *)addr, 0xcc, PAGE_SIZE); | |
149 | free_page(addr); | |
150 | totalram_pages++; | |
151 | } | |
152 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); | |
153 | } | |
154 | ||
155 | #ifdef CONFIG_BLK_DEV_INITRD | |
156 | void free_initrd_mem(unsigned long start, unsigned long end) | |
157 | { | |
158 | int pages = 0; | |
159 | for (; start < end; start += PAGE_SIZE) { | |
160 | ClearPageReserved(virt_to_page(start)); | |
161 | init_page_count(virt_to_page(start)); | |
162 | free_page(start); | |
163 | totalram_pages++; | |
164 | pages++; | |
165 | } | |
166 | printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages); | |
167 | } | |
168 | #endif | |
169 | ||
170 | void free_initmem(void) | |
171 | { | |
172 | free_init_pages("unused kernel memory", | |
173 | (unsigned long)(&__init_begin), | |
174 | (unsigned long)(&__init_end)); | |
175 | } | |
176 | ||
177 | /* FIXME from arch/powerpc/mm/mem.c*/ | |
178 | void show_mem(void) | |
179 | { | |
180 | printk(KERN_NOTICE "%s\n", __func__); | |
181 | } | |
182 | ||
183 | void __init mem_init(void) | |
184 | { | |
185 | high_memory = (void *)__va(memory_end); | |
186 | /* this will put all memory onto the freelists */ | |
187 | totalram_pages += free_all_bootmem(); | |
188 | ||
189 | printk(KERN_INFO "Memory: %luk/%luk available\n", | |
190 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
191 | num_physpages << (PAGE_SHIFT-10)); | |
192 | } | |
193 | ||
194 | /* Check against bounds of physical memory */ | |
195 | int ___range_ok(unsigned long addr, unsigned long size) | |
196 | { | |
197 | return ((addr < memory_start) || | |
198 | ((addr + size) > memory_end)); | |
199 | } | |
5af7fa68 | 200 | EXPORT_SYMBOL(___range_ok); |