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22#undef DEBUG
23
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#include <linux/poison.h>
43#include <linux/memblock.h>
44#include <linux/hugetlb.h>
45#include <linux/slab.h>
46
47#include <asm/pgalloc.h>
48#include <asm/page.h>
49#include <asm/prom.h>
50#include <asm/rtas.h>
51#include <asm/io.h>
52#include <asm/mmu_context.h>
53#include <asm/pgtable.h>
54#include <asm/mmu.h>
55#include <asm/uaccess.h>
56#include <asm/smp.h>
57#include <asm/machdep.h>
58#include <asm/tlb.h>
59#include <asm/eeh.h>
60#include <asm/processor.h>
61#include <asm/mmzone.h>
62#include <asm/cputable.h>
63#include <asm/sections.h>
64#include <asm/iommu.h>
65#include <asm/vdso.h>
66
67#include "mmu_decl.h"
68
69#ifdef CONFIG_PPC_STD_MMU_64
70#if PGTABLE_RANGE > USER_VSID_RANGE
71#warning Limited user VSID range means pagetable space is wasted
72#endif
73
74#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
75#warning TASK_SIZE is smaller than it needs to be.
76#endif
77#endif
78
79phys_addr_t memstart_addr = ~0;
80EXPORT_SYMBOL_GPL(memstart_addr);
81phys_addr_t kernstart_addr;
82EXPORT_SYMBOL_GPL(kernstart_addr);
83
84static void pgd_ctor(void *addr)
85{
86 memset(addr, 0, PGD_TABLE_SIZE);
87}
88
89static void pmd_ctor(void *addr)
90{
91#ifdef CONFIG_TRANSPARENT_HUGEPAGE
92 memset(addr, 0, PMD_TABLE_SIZE * 2);
93#else
94 memset(addr, 0, PMD_TABLE_SIZE);
95#endif
96}
97
98struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE];
99
100
101
102
103
104
105
106
107void pgtable_cache_add(unsigned shift, void (*ctor)(void *))
108{
109 char *name;
110 unsigned long table_size = sizeof(void *) << shift;
111 unsigned long align = table_size;
112
113
114
115
116
117
118
119
120 unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1,
121 HUGEPD_SHIFT_MASK + 1);
122 struct kmem_cache *new;
123
124
125
126
127 BUG_ON(!is_power_of_2(minalign));
128 BUG_ON((shift < 1) || (shift > MAX_PGTABLE_INDEX_SIZE));
129
130 if (PGT_CACHE(shift))
131 return;
132
133 align = max_t(unsigned long, align, minalign);
134 name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift);
135 new = kmem_cache_create(name, table_size, align, 0, ctor);
136 pgtable_cache[shift - 1] = new;
137 pr_debug("Allocated pgtable cache for order %d\n", shift);
138}
139
140
141void pgtable_cache_init(void)
142{
143 pgtable_cache_add(PGD_INDEX_SIZE, pgd_ctor);
144 pgtable_cache_add(PMD_CACHE_INDEX, pmd_ctor);
145 if (!PGT_CACHE(PGD_INDEX_SIZE) || !PGT_CACHE(PMD_CACHE_INDEX))
146 panic("Couldn't allocate pgtable caches");
147
148
149
150
151
152 BUG_ON(PUD_INDEX_SIZE && !PGT_CACHE(PUD_INDEX_SIZE));
153}
154
155#ifdef CONFIG_SPARSEMEM_VMEMMAP
156
157
158
159
160
161
162static unsigned long __meminit vmemmap_section_start(unsigned long page)
163{
164 unsigned long offset = page - ((unsigned long)(vmemmap));
165
166
167 return (offset / sizeof(struct page)) & PAGE_SECTION_MASK;
168}
169
170
171
172
173
174
175static int __meminit vmemmap_populated(unsigned long start, int page_size)
176{
177 unsigned long end = start + page_size;
178
179 for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
180 if (pfn_valid(vmemmap_section_start(start)))
181 return 1;
182
183 return 0;
184}
185
186
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188
189
190
191
192
193#ifdef CONFIG_PPC_BOOK3E
194static void __meminit vmemmap_create_mapping(unsigned long start,
195 unsigned long page_size,
196 unsigned long phys)
197{
198
199 unsigned long i, flags = _PAGE_PRESENT | _PAGE_ACCESSED |
200 _PAGE_KERNEL_RW;
201
202
203 BUG_ON(mmu_psize_defs[mmu_vmemmap_psize].enc > 0xf);
204
205
206 flags |= mmu_psize_defs[mmu_vmemmap_psize].enc << 8;
207
208
209
210
211
212 for (i = 0; i < page_size; i += PAGE_SIZE)
213 BUG_ON(map_kernel_page(start + i, phys, flags));
214}
215#else
216static void __meminit vmemmap_create_mapping(unsigned long start,
217 unsigned long page_size,
218 unsigned long phys)
219{
220 int mapped = htab_bolt_mapping(start, start + page_size, phys,
221 pgprot_val(PAGE_KERNEL),
222 mmu_vmemmap_psize,
223 mmu_kernel_ssize);
224 BUG_ON(mapped < 0);
225}
226#endif
227
228struct vmemmap_backing *vmemmap_list;
229
230static __meminit struct vmemmap_backing * vmemmap_list_alloc(int node)
231{
232 static struct vmemmap_backing *next;
233 static int num_left;
234
235
236 if (!next || !num_left) {
237 next = vmemmap_alloc_block(PAGE_SIZE, node);
238 if (unlikely(!next)) {
239 WARN_ON(1);
240 return NULL;
241 }
242 num_left = PAGE_SIZE / sizeof(struct vmemmap_backing);
243 }
244
245 num_left--;
246
247 return next++;
248}
249
250static __meminit void vmemmap_list_populate(unsigned long phys,
251 unsigned long start,
252 int node)
253{
254 struct vmemmap_backing *vmem_back;
255
256 vmem_back = vmemmap_list_alloc(node);
257 if (unlikely(!vmem_back)) {
258 WARN_ON(1);
259 return;
260 }
261
262 vmem_back->phys = phys;
263 vmem_back->virt_addr = start;
264 vmem_back->list = vmemmap_list;
265
266 vmemmap_list = vmem_back;
267}
268
269int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
270{
271 unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
272
273
274 start = _ALIGN_DOWN(start, page_size);
275
276 pr_debug("vmemmap_populate %lx..%lx, node %d\n", start, end, node);
277
278 for (; start < end; start += page_size) {
279 void *p;
280
281 if (vmemmap_populated(start, page_size))
282 continue;
283
284 p = vmemmap_alloc_block(page_size, node);
285 if (!p)
286 return -ENOMEM;
287
288 vmemmap_list_populate(__pa(p), start, node);
289
290 pr_debug(" * %016lx..%016lx allocated at %p\n",
291 start, start + page_size, p);
292
293 vmemmap_create_mapping(start, page_size, __pa(p));
294 }
295
296 return 0;
297}
298
299void vmemmap_free(unsigned long start, unsigned long end)
300{
301}
302
303#endif
304
305