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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 | #undef DEBUG | |
24 | ||
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> | |
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> | |
67 | #include <asm/imalloc.h> | |
68 | ||
69 | #ifdef DEBUG | |
70 | #define DBG(fmt...) printk(fmt) | |
71 | #else | |
72 | #define DBG(fmt...) | |
73 | #endif | |
74 | ||
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 | ||
83 | /* max amount of RAM to use */ | |
84 | unsigned long __max_memory; | |
85 | ||
86 | /* info on what we think the IO hole is */ | |
87 | unsigned long io_hole_start; | |
88 | unsigned long io_hole_size; | |
89 | ||
90 | /* | |
91 | * Do very early mm setup. | |
92 | */ | |
93 | void __init mm_init_ppc64(void) | |
94 | { | |
95 | #ifndef CONFIG_PPC_ISERIES | |
96 | unsigned long i; | |
97 | #endif | |
98 | ||
99 | ppc64_boot_msg(0x100, "MM Init"); | |
100 | ||
101 | /* This is the story of the IO hole... please, keep seated, | |
102 | * unfortunately, we are out of oxygen masks at the moment. | |
103 | * So we need some rough way to tell where your big IO hole | |
104 | * is. On pmac, it's between 2G and 4G, on POWER3, it's around | |
105 | * that area as well, on POWER4 we don't have one, etc... | |
106 | * We need that as a "hint" when sizing the TCE table on POWER3 | |
107 | * So far, the simplest way that seem work well enough for us it | |
108 | * to just assume that the first discontinuity in our physical | |
109 | * RAM layout is the IO hole. That may not be correct in the future | |
110 | * (and isn't on iSeries but then we don't care ;) | |
111 | */ | |
112 | ||
113 | #ifndef CONFIG_PPC_ISERIES | |
114 | for (i = 1; i < lmb.memory.cnt; i++) { | |
115 | unsigned long base, prevbase, prevsize; | |
116 | ||
117 | prevbase = lmb.memory.region[i-1].base; | |
118 | prevsize = lmb.memory.region[i-1].size; | |
119 | base = lmb.memory.region[i].base; | |
120 | if (base > (prevbase + prevsize)) { | |
121 | io_hole_start = prevbase + prevsize; | |
122 | io_hole_size = base - (prevbase + prevsize); | |
123 | break; | |
124 | } | |
125 | } | |
126 | #endif /* CONFIG_PPC_ISERIES */ | |
127 | if (io_hole_start) | |
128 | printk("IO Hole assumed to be %lx -> %lx\n", | |
129 | io_hole_start, io_hole_start + io_hole_size - 1); | |
130 | ||
131 | ppc64_boot_msg(0x100, "MM Init Done"); | |
132 | } | |
133 | ||
134 | void free_initmem(void) | |
135 | { | |
136 | unsigned long addr; | |
137 | ||
138 | addr = (unsigned long)__init_begin; | |
139 | for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { | |
140 | memset((void *)addr, 0xcc, PAGE_SIZE); | |
141 | ClearPageReserved(virt_to_page(addr)); | |
142 | set_page_count(virt_to_page(addr), 1); | |
143 | free_page(addr); | |
144 | totalram_pages++; | |
145 | } | |
146 | printk ("Freeing unused kernel memory: %luk freed\n", | |
147 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10); | |
148 | } | |
149 | ||
150 | #ifdef CONFIG_BLK_DEV_INITRD | |
151 | void free_initrd_mem(unsigned long start, unsigned long end) | |
152 | { | |
153 | if (start < end) | |
154 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
155 | for (; start < end; start += PAGE_SIZE) { | |
156 | ClearPageReserved(virt_to_page(start)); | |
157 | set_page_count(virt_to_page(start), 1); | |
158 | free_page(start); | |
159 | totalram_pages++; | |
160 | } | |
161 | } | |
162 | #endif | |
163 | ||
164 | static struct kcore_list kcore_vmem; | |
165 | ||
166 | static int __init setup_kcore(void) | |
167 | { | |
168 | int i; | |
169 | ||
170 | for (i=0; i < lmb.memory.cnt; i++) { | |
171 | unsigned long base, size; | |
172 | struct kcore_list *kcore_mem; | |
173 | ||
174 | base = lmb.memory.region[i].base; | |
175 | size = lmb.memory.region[i].size; | |
176 | ||
177 | /* GFP_ATOMIC to avoid might_sleep warnings during boot */ | |
178 | kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); | |
179 | if (!kcore_mem) | |
180 | panic("mem_init: kmalloc failed\n"); | |
181 | ||
182 | kclist_add(kcore_mem, __va(base), size); | |
183 | } | |
184 | ||
185 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | module_init(setup_kcore); | |
190 | ||
191 | static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags) | |
192 | { | |
193 | memset(addr, 0, kmem_cache_size(cache)); | |
194 | } | |
195 | ||
196 | #ifdef CONFIG_PPC_64K_PAGES | |
197 | static const unsigned int pgtable_cache_size[3] = { | |
198 | PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE | |
199 | }; | |
200 | static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { | |
201 | "pte_pmd_cache", "pmd_cache", "pgd_cache", | |
202 | }; | |
203 | #else | |
204 | static const unsigned int pgtable_cache_size[2] = { | |
205 | PTE_TABLE_SIZE, PMD_TABLE_SIZE | |
206 | }; | |
207 | static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { | |
208 | "pgd_pte_cache", "pud_pmd_cache", | |
209 | }; | |
210 | #endif /* CONFIG_PPC_64K_PAGES */ | |
211 | ||
212 | kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; | |
213 | ||
214 | void pgtable_cache_init(void) | |
215 | { | |
216 | int i; | |
217 | ||
218 | for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) { | |
219 | int size = pgtable_cache_size[i]; | |
220 | const char *name = pgtable_cache_name[i]; | |
221 | ||
222 | DBG("Allocating page table cache %s (#%d) " | |
223 | "for size: %08x...\n", name, i, size); | |
224 | pgtable_cache[i] = kmem_cache_create(name, | |
225 | size, size, | |
226 | SLAB_HWCACHE_ALIGN | | |
227 | SLAB_MUST_HWCACHE_ALIGN, | |
228 | zero_ctor, | |
229 | NULL); | |
230 | if (! pgtable_cache[i]) | |
231 | panic("pgtable_cache_init(): could not create %s!\n", | |
232 | name); | |
233 | } | |
234 | } |