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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 | |
8 | * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). | |
9 | * | |
10 | * Derived from "arch/i386/mm/init.c" | |
11 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
12 | * | |
13 | * Dave Engebretsen <engebret@us.ibm.com> | |
14 | * Rework for PPC64 port. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | * | |
21 | */ | |
22 | ||
87655ff2 BH |
23 | #undef DEBUG |
24 | ||
14cf11af PM |
25 | #include <linux/config.h> |
26 | #include <linux/signal.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/string.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/mman.h> | |
33 | #include <linux/mm.h> | |
34 | #include <linux/swap.h> | |
35 | #include <linux/stddef.h> | |
36 | #include <linux/vmalloc.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/delay.h> | |
39 | #include <linux/bootmem.h> | |
40 | #include <linux/highmem.h> | |
41 | #include <linux/idr.h> | |
42 | #include <linux/nodemask.h> | |
43 | #include <linux/module.h> | |
44 | ||
45 | #include <asm/pgalloc.h> | |
46 | #include <asm/page.h> | |
47 | #include <asm/prom.h> | |
48 | #include <asm/lmb.h> | |
49 | #include <asm/rtas.h> | |
50 | #include <asm/io.h> | |
51 | #include <asm/mmu_context.h> | |
52 | #include <asm/pgtable.h> | |
53 | #include <asm/mmu.h> | |
54 | #include <asm/uaccess.h> | |
55 | #include <asm/smp.h> | |
56 | #include <asm/machdep.h> | |
57 | #include <asm/tlb.h> | |
58 | #include <asm/eeh.h> | |
59 | #include <asm/processor.h> | |
60 | #include <asm/mmzone.h> | |
61 | #include <asm/cputable.h> | |
14cf11af PM |
62 | #include <asm/sections.h> |
63 | #include <asm/system.h> | |
64 | #include <asm/iommu.h> | |
65 | #include <asm/abs_addr.h> | |
66 | #include <asm/vdso.h> | |
800fc3ee DG |
67 | |
68 | #include "mmu_decl.h" | |
14cf11af | 69 | |
87655ff2 BH |
70 | #ifdef DEBUG |
71 | #define DBG(fmt...) printk(fmt) | |
72 | #else | |
73 | #define DBG(fmt...) | |
74 | #endif | |
75 | ||
14cf11af PM |
76 | #if PGTABLE_RANGE > USER_VSID_RANGE |
77 | #warning Limited user VSID range means pagetable space is wasted | |
78 | #endif | |
79 | ||
80 | #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE) | |
81 | #warning TASK_SIZE is smaller than it needs to be. | |
82 | #endif | |
83 | ||
14cf11af PM |
84 | /* max amount of RAM to use */ |
85 | unsigned long __max_memory; | |
86 | ||
87 | /* info on what we think the IO hole is */ | |
88 | unsigned long io_hole_start; | |
89 | unsigned long io_hole_size; | |
90 | ||
91 | /* | |
92 | * Do very early mm setup. | |
93 | */ | |
94 | void __init mm_init_ppc64(void) | |
95 | { | |
96 | #ifndef CONFIG_PPC_ISERIES | |
97 | unsigned long i; | |
98 | #endif | |
99 | ||
100 | ppc64_boot_msg(0x100, "MM Init"); | |
101 | ||
102 | /* This is the story of the IO hole... please, keep seated, | |
103 | * unfortunately, we are out of oxygen masks at the moment. | |
104 | * So we need some rough way to tell where your big IO hole | |
105 | * is. On pmac, it's between 2G and 4G, on POWER3, it's around | |
106 | * that area as well, on POWER4 we don't have one, etc... | |
107 | * We need that as a "hint" when sizing the TCE table on POWER3 | |
108 | * So far, the simplest way that seem work well enough for us it | |
109 | * to just assume that the first discontinuity in our physical | |
110 | * RAM layout is the IO hole. That may not be correct in the future | |
111 | * (and isn't on iSeries but then we don't care ;) | |
112 | */ | |
113 | ||
114 | #ifndef CONFIG_PPC_ISERIES | |
115 | for (i = 1; i < lmb.memory.cnt; i++) { | |
116 | unsigned long base, prevbase, prevsize; | |
117 | ||
118 | prevbase = lmb.memory.region[i-1].base; | |
119 | prevsize = lmb.memory.region[i-1].size; | |
120 | base = lmb.memory.region[i].base; | |
121 | if (base > (prevbase + prevsize)) { | |
122 | io_hole_start = prevbase + prevsize; | |
123 | io_hole_size = base - (prevbase + prevsize); | |
124 | break; | |
125 | } | |
126 | } | |
127 | #endif /* CONFIG_PPC_ISERIES */ | |
128 | if (io_hole_start) | |
129 | printk("IO Hole assumed to be %lx -> %lx\n", | |
130 | io_hole_start, io_hole_start + io_hole_size - 1); | |
131 | ||
132 | ppc64_boot_msg(0x100, "MM Init Done"); | |
133 | } | |
134 | ||
135 | void free_initmem(void) | |
136 | { | |
137 | unsigned long addr; | |
138 | ||
139 | addr = (unsigned long)__init_begin; | |
140 | for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { | |
141 | memset((void *)addr, 0xcc, PAGE_SIZE); | |
142 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 143 | init_page_count(virt_to_page(addr)); |
14cf11af PM |
144 | free_page(addr); |
145 | totalram_pages++; | |
146 | } | |
147 | printk ("Freeing unused kernel memory: %luk freed\n", | |
148 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10); | |
149 | } | |
150 | ||
151 | #ifdef CONFIG_BLK_DEV_INITRD | |
152 | void free_initrd_mem(unsigned long start, unsigned long end) | |
153 | { | |
154 | if (start < end) | |
155 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
156 | for (; start < end; start += PAGE_SIZE) { | |
157 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 158 | init_page_count(virt_to_page(start)); |
14cf11af PM |
159 | free_page(start); |
160 | totalram_pages++; | |
161 | } | |
162 | } | |
163 | #endif | |
164 | ||
14cf11af PM |
165 | static struct kcore_list kcore_vmem; |
166 | ||
167 | static int __init setup_kcore(void) | |
168 | { | |
169 | int i; | |
170 | ||
171 | for (i=0; i < lmb.memory.cnt; i++) { | |
172 | unsigned long base, size; | |
173 | struct kcore_list *kcore_mem; | |
174 | ||
175 | base = lmb.memory.region[i].base; | |
176 | size = lmb.memory.region[i].size; | |
177 | ||
178 | /* GFP_ATOMIC to avoid might_sleep warnings during boot */ | |
179 | kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); | |
180 | if (!kcore_mem) | |
181 | panic("mem_init: kmalloc failed\n"); | |
182 | ||
183 | kclist_add(kcore_mem, __va(base), size); | |
184 | } | |
185 | ||
186 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); | |
187 | ||
188 | return 0; | |
189 | } | |
190 | module_init(setup_kcore); | |
191 | ||
14cf11af PM |
192 | static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags) |
193 | { | |
194 | memset(addr, 0, kmem_cache_size(cache)); | |
195 | } | |
196 | ||
3c726f8d | 197 | #ifdef CONFIG_PPC_64K_PAGES |
87655ff2 BH |
198 | static const unsigned int pgtable_cache_size[3] = { |
199 | PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE | |
3c726f8d BH |
200 | }; |
201 | static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { | |
87655ff2 | 202 | "pte_pmd_cache", "pmd_cache", "pgd_cache", |
3c726f8d BH |
203 | }; |
204 | #else | |
87655ff2 | 205 | static const unsigned int pgtable_cache_size[2] = { |
14cf11af PM |
206 | PTE_TABLE_SIZE, PMD_TABLE_SIZE |
207 | }; | |
208 | static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { | |
209 | "pgd_pte_cache", "pud_pmd_cache", | |
210 | }; | |
3c726f8d | 211 | #endif /* CONFIG_PPC_64K_PAGES */ |
14cf11af PM |
212 | |
213 | kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; | |
214 | ||
215 | void pgtable_cache_init(void) | |
216 | { | |
217 | int i; | |
218 | ||
14cf11af PM |
219 | for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) { |
220 | int size = pgtable_cache_size[i]; | |
221 | const char *name = pgtable_cache_name[i]; | |
222 | ||
87655ff2 BH |
223 | DBG("Allocating page table cache %s (#%d) " |
224 | "for size: %08x...\n", name, i, size); | |
14cf11af PM |
225 | pgtable_cache[i] = kmem_cache_create(name, |
226 | size, size, | |
3c726f8d BH |
227 | SLAB_HWCACHE_ALIGN | |
228 | SLAB_MUST_HWCACHE_ALIGN, | |
14cf11af PM |
229 | zero_ctor, |
230 | NULL); | |
231 | if (! pgtable_cache[i]) | |
232 | panic("pgtable_cache_init(): could not create %s!\n", | |
233 | name); | |
234 | } | |
235 | } |