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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 | ||
23 | #include <linux/config.h> | |
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> | |
42 | ||
43 | #include <asm/pgalloc.h> | |
44 | #include <asm/page.h> | |
45 | #include <asm/prom.h> | |
46 | #include <asm/lmb.h> | |
47 | #include <asm/rtas.h> | |
48 | #include <asm/io.h> | |
49 | #include <asm/mmu_context.h> | |
50 | #include <asm/pgtable.h> | |
51 | #include <asm/mmu.h> | |
52 | #include <asm/uaccess.h> | |
53 | #include <asm/smp.h> | |
54 | #include <asm/machdep.h> | |
55 | #include <asm/tlb.h> | |
56 | #include <asm/eeh.h> | |
57 | #include <asm/processor.h> | |
58 | #include <asm/mmzone.h> | |
59 | #include <asm/cputable.h> | |
14cf11af PM |
60 | #include <asm/sections.h> |
61 | #include <asm/system.h> | |
62 | #include <asm/iommu.h> | |
63 | #include <asm/abs_addr.h> | |
64 | #include <asm/vdso.h> | |
65 | #include <asm/imalloc.h> | |
66 | ||
67 | #if PGTABLE_RANGE > USER_VSID_RANGE | |
68 | #warning Limited user VSID range means pagetable space is wasted | |
69 | #endif | |
70 | ||
71 | #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE) | |
72 | #warning TASK_SIZE is smaller than it needs to be. | |
73 | #endif | |
74 | ||
14cf11af PM |
75 | unsigned long klimit = (unsigned long)_end; |
76 | ||
14cf11af PM |
77 | /* max amount of RAM to use */ |
78 | unsigned long __max_memory; | |
79 | ||
80 | /* info on what we think the IO hole is */ | |
81 | unsigned long io_hole_start; | |
82 | unsigned long io_hole_size; | |
83 | ||
84 | /* | |
85 | * Do very early mm setup. | |
86 | */ | |
87 | void __init mm_init_ppc64(void) | |
88 | { | |
89 | #ifndef CONFIG_PPC_ISERIES | |
90 | unsigned long i; | |
91 | #endif | |
92 | ||
93 | ppc64_boot_msg(0x100, "MM Init"); | |
94 | ||
95 | /* This is the story of the IO hole... please, keep seated, | |
96 | * unfortunately, we are out of oxygen masks at the moment. | |
97 | * So we need some rough way to tell where your big IO hole | |
98 | * is. On pmac, it's between 2G and 4G, on POWER3, it's around | |
99 | * that area as well, on POWER4 we don't have one, etc... | |
100 | * We need that as a "hint" when sizing the TCE table on POWER3 | |
101 | * So far, the simplest way that seem work well enough for us it | |
102 | * to just assume that the first discontinuity in our physical | |
103 | * RAM layout is the IO hole. That may not be correct in the future | |
104 | * (and isn't on iSeries but then we don't care ;) | |
105 | */ | |
106 | ||
107 | #ifndef CONFIG_PPC_ISERIES | |
108 | for (i = 1; i < lmb.memory.cnt; i++) { | |
109 | unsigned long base, prevbase, prevsize; | |
110 | ||
111 | prevbase = lmb.memory.region[i-1].base; | |
112 | prevsize = lmb.memory.region[i-1].size; | |
113 | base = lmb.memory.region[i].base; | |
114 | if (base > (prevbase + prevsize)) { | |
115 | io_hole_start = prevbase + prevsize; | |
116 | io_hole_size = base - (prevbase + prevsize); | |
117 | break; | |
118 | } | |
119 | } | |
120 | #endif /* CONFIG_PPC_ISERIES */ | |
121 | if (io_hole_start) | |
122 | printk("IO Hole assumed to be %lx -> %lx\n", | |
123 | io_hole_start, io_hole_start + io_hole_size - 1); | |
124 | ||
125 | ppc64_boot_msg(0x100, "MM Init Done"); | |
126 | } | |
127 | ||
128 | void free_initmem(void) | |
129 | { | |
130 | unsigned long addr; | |
131 | ||
132 | addr = (unsigned long)__init_begin; | |
133 | for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { | |
134 | memset((void *)addr, 0xcc, PAGE_SIZE); | |
135 | ClearPageReserved(virt_to_page(addr)); | |
136 | set_page_count(virt_to_page(addr), 1); | |
137 | free_page(addr); | |
138 | totalram_pages++; | |
139 | } | |
140 | printk ("Freeing unused kernel memory: %luk freed\n", | |
141 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10); | |
142 | } | |
143 | ||
144 | #ifdef CONFIG_BLK_DEV_INITRD | |
145 | void free_initrd_mem(unsigned long start, unsigned long end) | |
146 | { | |
147 | if (start < end) | |
148 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
149 | for (; start < end; start += PAGE_SIZE) { | |
150 | ClearPageReserved(virt_to_page(start)); | |
151 | set_page_count(virt_to_page(start), 1); | |
152 | free_page(start); | |
153 | totalram_pages++; | |
154 | } | |
155 | } | |
156 | #endif | |
157 | ||
14cf11af PM |
158 | static struct kcore_list kcore_vmem; |
159 | ||
160 | static int __init setup_kcore(void) | |
161 | { | |
162 | int i; | |
163 | ||
164 | for (i=0; i < lmb.memory.cnt; i++) { | |
165 | unsigned long base, size; | |
166 | struct kcore_list *kcore_mem; | |
167 | ||
168 | base = lmb.memory.region[i].base; | |
169 | size = lmb.memory.region[i].size; | |
170 | ||
171 | /* GFP_ATOMIC to avoid might_sleep warnings during boot */ | |
172 | kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); | |
173 | if (!kcore_mem) | |
174 | panic("mem_init: kmalloc failed\n"); | |
175 | ||
176 | kclist_add(kcore_mem, __va(base), size); | |
177 | } | |
178 | ||
179 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); | |
180 | ||
181 | return 0; | |
182 | } | |
183 | module_init(setup_kcore); | |
184 | ||
14cf11af PM |
185 | static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags) |
186 | { | |
187 | memset(addr, 0, kmem_cache_size(cache)); | |
188 | } | |
189 | ||
190 | static const int pgtable_cache_size[2] = { | |
191 | PTE_TABLE_SIZE, PMD_TABLE_SIZE | |
192 | }; | |
193 | static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { | |
194 | "pgd_pte_cache", "pud_pmd_cache", | |
195 | }; | |
196 | ||
197 | kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; | |
198 | ||
199 | void pgtable_cache_init(void) | |
200 | { | |
201 | int i; | |
202 | ||
203 | BUILD_BUG_ON(PTE_TABLE_SIZE != pgtable_cache_size[PTE_CACHE_NUM]); | |
204 | BUILD_BUG_ON(PMD_TABLE_SIZE != pgtable_cache_size[PMD_CACHE_NUM]); | |
205 | BUILD_BUG_ON(PUD_TABLE_SIZE != pgtable_cache_size[PUD_CACHE_NUM]); | |
206 | BUILD_BUG_ON(PGD_TABLE_SIZE != pgtable_cache_size[PGD_CACHE_NUM]); | |
207 | ||
208 | for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) { | |
209 | int size = pgtable_cache_size[i]; | |
210 | const char *name = pgtable_cache_name[i]; | |
211 | ||
212 | pgtable_cache[i] = kmem_cache_create(name, | |
213 | size, size, | |
214 | SLAB_HWCACHE_ALIGN | |
215 | | SLAB_MUST_HWCACHE_ALIGN, | |
216 | zero_ctor, | |
217 | NULL); | |
218 | if (! pgtable_cache[i]) | |
219 | panic("pgtable_cache_init(): could not create %s!\n", | |
220 | name); | |
221 | } | |
222 | } |