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14cf11af PM |
1 | /* |
2 | * PowerPC version | |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * | |
5 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
6 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
7 | * Copyright (C) 1996 Paul Mackerras | |
14cf11af PM |
8 | * |
9 | * Derived from "arch/i386/mm/init.c" | |
10 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
11 | * | |
12 | * Dave Engebretsen <engebret@us.ibm.com> | |
13 | * Rework for PPC64 port. | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | * | |
20 | */ | |
21 | ||
cec08e7a BH |
22 | #undef DEBUG |
23 | ||
14cf11af PM |
24 | #include <linux/signal.h> |
25 | #include <linux/sched.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/mman.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/swap.h> | |
33 | #include <linux/stddef.h> | |
34 | #include <linux/vmalloc.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/delay.h> | |
37 | #include <linux/bootmem.h> | |
38 | #include <linux/highmem.h> | |
39 | #include <linux/idr.h> | |
40 | #include <linux/nodemask.h> | |
41 | #include <linux/module.h> | |
c9cf5528 | 42 | #include <linux/poison.h> |
d9b2b2a2 | 43 | #include <linux/lmb.h> |
14cf11af PM |
44 | |
45 | #include <asm/pgalloc.h> | |
46 | #include <asm/page.h> | |
47 | #include <asm/prom.h> | |
14cf11af PM |
48 | #include <asm/rtas.h> |
49 | #include <asm/io.h> | |
50 | #include <asm/mmu_context.h> | |
51 | #include <asm/pgtable.h> | |
52 | #include <asm/mmu.h> | |
53 | #include <asm/uaccess.h> | |
54 | #include <asm/smp.h> | |
55 | #include <asm/machdep.h> | |
56 | #include <asm/tlb.h> | |
57 | #include <asm/eeh.h> | |
58 | #include <asm/processor.h> | |
59 | #include <asm/mmzone.h> | |
60 | #include <asm/cputable.h> | |
14cf11af PM |
61 | #include <asm/sections.h> |
62 | #include <asm/system.h> | |
63 | #include <asm/iommu.h> | |
64 | #include <asm/abs_addr.h> | |
65 | #include <asm/vdso.h> | |
800fc3ee DG |
66 | |
67 | #include "mmu_decl.h" | |
14cf11af PM |
68 | |
69 | #if PGTABLE_RANGE > USER_VSID_RANGE | |
70 | #warning Limited user VSID range means pagetable space is wasted | |
71 | #endif | |
72 | ||
73 | #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE) | |
74 | #warning TASK_SIZE is smaller than it needs to be. | |
75 | #endif | |
76 | ||
37dd2bad KG |
77 | phys_addr_t memstart_addr = ~0; |
78 | phys_addr_t kernstart_addr; | |
d7917ba7 | 79 | |
14cf11af PM |
80 | void free_initmem(void) |
81 | { | |
82 | unsigned long addr; | |
83 | ||
84 | addr = (unsigned long)__init_begin; | |
85 | for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { | |
c9cf5528 | 86 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
14cf11af | 87 | ClearPageReserved(virt_to_page(addr)); |
7835e98b | 88 | init_page_count(virt_to_page(addr)); |
14cf11af PM |
89 | free_page(addr); |
90 | totalram_pages++; | |
91 | } | |
92 | printk ("Freeing unused kernel memory: %luk freed\n", | |
93 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10); | |
94 | } | |
95 | ||
96 | #ifdef CONFIG_BLK_DEV_INITRD | |
97 | void free_initrd_mem(unsigned long start, unsigned long end) | |
98 | { | |
99 | if (start < end) | |
100 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
101 | for (; start < end; start += PAGE_SIZE) { | |
102 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 103 | init_page_count(virt_to_page(start)); |
14cf11af PM |
104 | free_page(start); |
105 | totalram_pages++; | |
106 | } | |
107 | } | |
108 | #endif | |
109 | ||
df174e3b | 110 | #ifdef CONFIG_PROC_KCORE |
14cf11af PM |
111 | static struct kcore_list kcore_vmem; |
112 | ||
113 | static int __init setup_kcore(void) | |
114 | { | |
115 | int i; | |
116 | ||
117 | for (i=0; i < lmb.memory.cnt; i++) { | |
118 | unsigned long base, size; | |
119 | struct kcore_list *kcore_mem; | |
120 | ||
121 | base = lmb.memory.region[i].base; | |
122 | size = lmb.memory.region[i].size; | |
123 | ||
124 | /* GFP_ATOMIC to avoid might_sleep warnings during boot */ | |
125 | kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); | |
126 | if (!kcore_mem) | |
e48b1b45 | 127 | panic("%s: kmalloc failed\n", __func__); |
14cf11af PM |
128 | |
129 | kclist_add(kcore_mem, __va(base), size); | |
130 | } | |
131 | ||
132 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | module_init(setup_kcore); | |
df174e3b | 137 | #endif |
14cf11af | 138 | |
51cc5068 | 139 | static void pgd_ctor(void *addr) |
14cf11af | 140 | { |
51cc5068 AD |
141 | memset(addr, 0, PGD_TABLE_SIZE); |
142 | } | |
143 | ||
144 | static void pmd_ctor(void *addr) | |
145 | { | |
146 | memset(addr, 0, PMD_TABLE_SIZE); | |
14cf11af PM |
147 | } |
148 | ||
87655ff2 | 149 | static const unsigned int pgtable_cache_size[2] = { |
517e2263 | 150 | PGD_TABLE_SIZE, PMD_TABLE_SIZE |
14cf11af PM |
151 | }; |
152 | static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { | |
517e2263 HD |
153 | #ifdef CONFIG_PPC_64K_PAGES |
154 | "pgd_cache", "pmd_cache", | |
155 | #else | |
156 | "pgd_cache", "pud_pmd_cache", | |
3c726f8d | 157 | #endif /* CONFIG_PPC_64K_PAGES */ |
517e2263 | 158 | }; |
14cf11af | 159 | |
f10a04c0 | 160 | #ifdef CONFIG_HUGETLB_PAGE |
0d9ea754 JT |
161 | /* Hugepages need an extra cache per hugepagesize, initialized in |
162 | * hugetlbpage.c. We can't put into the tables above, because HPAGE_SHIFT | |
163 | * is not compile time constant. */ | |
164 | struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+MMU_PAGE_COUNT]; | |
f10a04c0 | 165 | #else |
e18b890b | 166 | struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; |
f10a04c0 | 167 | #endif |
14cf11af PM |
168 | |
169 | void pgtable_cache_init(void) | |
170 | { | |
51cc5068 AD |
171 | pgtable_cache[0] = kmem_cache_create(pgtable_cache_name[0], PGD_TABLE_SIZE, PGD_TABLE_SIZE, SLAB_PANIC, pgd_ctor); |
172 | pgtable_cache[1] = kmem_cache_create(pgtable_cache_name[1], PMD_TABLE_SIZE, PMD_TABLE_SIZE, SLAB_PANIC, pmd_ctor); | |
14cf11af | 173 | } |
d29eff7b AW |
174 | |
175 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
176 | /* | |
177 | * Given an address within the vmemmap, determine the pfn of the page that | |
178 | * represents the start of the section it is within. Note that we have to | |
179 | * do this by hand as the proffered address may not be correctly aligned. | |
180 | * Subtraction of non-aligned pointers produces undefined results. | |
181 | */ | |
09de9ff8 | 182 | static unsigned long __meminit vmemmap_section_start(unsigned long page) |
d29eff7b AW |
183 | { |
184 | unsigned long offset = page - ((unsigned long)(vmemmap)); | |
185 | ||
186 | /* Return the pfn of the start of the section. */ | |
187 | return (offset / sizeof(struct page)) & PAGE_SECTION_MASK; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Check if this vmemmap page is already initialised. If any section | |
192 | * which overlaps this vmemmap page is initialised then this page is | |
193 | * initialised already. | |
194 | */ | |
09de9ff8 | 195 | static int __meminit vmemmap_populated(unsigned long start, int page_size) |
d29eff7b AW |
196 | { |
197 | unsigned long end = start + page_size; | |
198 | ||
199 | for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page))) | |
200 | if (pfn_valid(vmemmap_section_start(start))) | |
201 | return 1; | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | int __meminit vmemmap_populate(struct page *start_page, | |
cec08e7a | 207 | unsigned long nr_pages, int node) |
d29eff7b AW |
208 | { |
209 | unsigned long mode_rw; | |
210 | unsigned long start = (unsigned long)start_page; | |
211 | unsigned long end = (unsigned long)(start_page + nr_pages); | |
cec08e7a | 212 | unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift; |
d29eff7b AW |
213 | |
214 | mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX; | |
215 | ||
216 | /* Align to the page size of the linear mapping. */ | |
217 | start = _ALIGN_DOWN(start, page_size); | |
218 | ||
219 | for (; start < end; start += page_size) { | |
220 | int mapped; | |
221 | void *p; | |
222 | ||
223 | if (vmemmap_populated(start, page_size)) | |
224 | continue; | |
225 | ||
226 | p = vmemmap_alloc_block(page_size, node); | |
227 | if (!p) | |
228 | return -ENOMEM; | |
229 | ||
6548d83a SR |
230 | pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n", |
231 | start, p, __pa(p)); | |
d29eff7b AW |
232 | |
233 | mapped = htab_bolt_mapping(start, start + page_size, | |
cec08e7a | 234 | __pa(p), mode_rw, mmu_vmemmap_psize, |
e95206ab | 235 | mmu_kernel_ssize); |
d29eff7b AW |
236 | BUG_ON(mapped < 0); |
237 | } | |
238 | ||
239 | return 0; | |
240 | } | |
cec08e7a | 241 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |