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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 | ||
87655ff2 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> |
14cf11af PM |
43 | |
44 | #include <asm/pgalloc.h> | |
45 | #include <asm/page.h> | |
46 | #include <asm/prom.h> | |
47 | #include <asm/lmb.h> | |
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 | 68 | |
87655ff2 BH |
69 | #ifdef DEBUG |
70 | #define DBG(fmt...) printk(fmt) | |
71 | #else | |
72 | #define DBG(fmt...) | |
73 | #endif | |
74 | ||
14cf11af PM |
75 | #if PGTABLE_RANGE > USER_VSID_RANGE |
76 | #warning Limited user VSID range means pagetable space is wasted | |
77 | #endif | |
78 | ||
79 | #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE) | |
80 | #warning TASK_SIZE is smaller than it needs to be. | |
81 | #endif | |
82 | ||
14cf11af PM |
83 | /* max amount of RAM to use */ |
84 | unsigned long __max_memory; | |
85 | ||
14cf11af PM |
86 | void free_initmem(void) |
87 | { | |
88 | unsigned long addr; | |
89 | ||
90 | addr = (unsigned long)__init_begin; | |
91 | for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { | |
c9cf5528 | 92 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); |
14cf11af | 93 | ClearPageReserved(virt_to_page(addr)); |
7835e98b | 94 | init_page_count(virt_to_page(addr)); |
14cf11af PM |
95 | free_page(addr); |
96 | totalram_pages++; | |
97 | } | |
98 | printk ("Freeing unused kernel memory: %luk freed\n", | |
99 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10); | |
100 | } | |
101 | ||
102 | #ifdef CONFIG_BLK_DEV_INITRD | |
103 | void free_initrd_mem(unsigned long start, unsigned long end) | |
104 | { | |
105 | if (start < end) | |
106 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
107 | for (; start < end; start += PAGE_SIZE) { | |
108 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 109 | init_page_count(virt_to_page(start)); |
14cf11af PM |
110 | free_page(start); |
111 | totalram_pages++; | |
112 | } | |
113 | } | |
114 | #endif | |
115 | ||
df174e3b | 116 | #ifdef CONFIG_PROC_KCORE |
14cf11af PM |
117 | static struct kcore_list kcore_vmem; |
118 | ||
119 | static int __init setup_kcore(void) | |
120 | { | |
121 | int i; | |
122 | ||
123 | for (i=0; i < lmb.memory.cnt; i++) { | |
124 | unsigned long base, size; | |
125 | struct kcore_list *kcore_mem; | |
126 | ||
127 | base = lmb.memory.region[i].base; | |
128 | size = lmb.memory.region[i].size; | |
129 | ||
130 | /* GFP_ATOMIC to avoid might_sleep warnings during boot */ | |
131 | kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); | |
132 | if (!kcore_mem) | |
adaa3a79 | 133 | panic("%s: kmalloc failed\n", __FUNCTION__); |
14cf11af PM |
134 | |
135 | kclist_add(kcore_mem, __va(base), size); | |
136 | } | |
137 | ||
138 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | module_init(setup_kcore); | |
df174e3b | 143 | #endif |
14cf11af | 144 | |
e18b890b | 145 | static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags) |
14cf11af PM |
146 | { |
147 | memset(addr, 0, kmem_cache_size(cache)); | |
148 | } | |
149 | ||
87655ff2 | 150 | static const unsigned int pgtable_cache_size[2] = { |
517e2263 | 151 | PGD_TABLE_SIZE, PMD_TABLE_SIZE |
14cf11af PM |
152 | }; |
153 | static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { | |
517e2263 HD |
154 | #ifdef CONFIG_PPC_64K_PAGES |
155 | "pgd_cache", "pmd_cache", | |
156 | #else | |
157 | "pgd_cache", "pud_pmd_cache", | |
3c726f8d | 158 | #endif /* CONFIG_PPC_64K_PAGES */ |
517e2263 | 159 | }; |
14cf11af | 160 | |
f10a04c0 DG |
161 | #ifdef CONFIG_HUGETLB_PAGE |
162 | /* Hugepages need one extra cache, initialized in hugetlbpage.c. We | |
163 | * can't put into the tables above, because HPAGE_SHIFT is not compile | |
164 | * time constant. */ | |
e18b890b | 165 | struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1]; |
f10a04c0 | 166 | #else |
e18b890b | 167 | struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; |
f10a04c0 | 168 | #endif |
14cf11af PM |
169 | |
170 | void pgtable_cache_init(void) | |
171 | { | |
172 | int i; | |
173 | ||
14cf11af PM |
174 | for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) { |
175 | int size = pgtable_cache_size[i]; | |
176 | const char *name = pgtable_cache_name[i]; | |
177 | ||
87655ff2 BH |
178 | DBG("Allocating page table cache %s (#%d) " |
179 | "for size: %08x...\n", name, i, size); | |
14cf11af PM |
180 | pgtable_cache[i] = kmem_cache_create(name, |
181 | size, size, | |
0e6b9c98 | 182 | SLAB_PANIC, |
20c2df83 | 183 | zero_ctor); |
14cf11af PM |
184 | } |
185 | } |