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7#include <linux/init.h>
8#include <linux/module.h>
9#include <linux/fs.h>
10#include <linux/mm.h>
11#include <linux/hugetlb.h>
12#include <linux/pagemap.h>
13#include <linux/sysctl.h>
14
15#include <asm/mman.h>
16#include <asm/pgalloc.h>
17#include <asm/tlb.h>
18#include <asm/tlbflush.h>
19#include <asm/cacheflush.h>
20#include <asm/mmu_context.h>
21
22
23
24
25#define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
26#define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL))
27
28static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
29 unsigned long addr,
30 unsigned long len,
31 unsigned long pgoff,
32 unsigned long flags)
33{
34 struct mm_struct *mm = current->mm;
35 struct vm_area_struct * vma;
36 unsigned long task_size = TASK_SIZE;
37 unsigned long start_addr;
38
39 if (test_thread_flag(TIF_32BIT))
40 task_size = STACK_TOP32;
41 if (unlikely(len >= VA_EXCLUDE_START))
42 return -ENOMEM;
43
44 if (len > mm->cached_hole_size) {
45 start_addr = addr = mm->free_area_cache;
46 } else {
47 start_addr = addr = TASK_UNMAPPED_BASE;
48 mm->cached_hole_size = 0;
49 }
50
51 task_size -= len;
52
53full_search:
54 addr = ALIGN(addr, HPAGE_SIZE);
55
56 for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
57
58 if (addr < VA_EXCLUDE_START &&
59 (addr + len) >= VA_EXCLUDE_START) {
60 addr = VA_EXCLUDE_END;
61 vma = find_vma(mm, VA_EXCLUDE_END);
62 }
63 if (unlikely(task_size < addr)) {
64 if (start_addr != TASK_UNMAPPED_BASE) {
65 start_addr = addr = TASK_UNMAPPED_BASE;
66 mm->cached_hole_size = 0;
67 goto full_search;
68 }
69 return -ENOMEM;
70 }
71 if (likely(!vma || addr + len <= vma->vm_start)) {
72
73
74
75 mm->free_area_cache = addr + len;
76 return addr;
77 }
78 if (addr + mm->cached_hole_size < vma->vm_start)
79 mm->cached_hole_size = vma->vm_start - addr;
80
81 addr = ALIGN(vma->vm_end, HPAGE_SIZE);
82 }
83}
84
85static unsigned long
86hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
87 const unsigned long len,
88 const unsigned long pgoff,
89 const unsigned long flags)
90{
91 struct vm_area_struct *vma;
92 struct mm_struct *mm = current->mm;
93 unsigned long addr = addr0;
94
95
96 BUG_ON(!test_thread_flag(TIF_32BIT));
97
98
99 if (len <= mm->cached_hole_size) {
100 mm->cached_hole_size = 0;
101 mm->free_area_cache = mm->mmap_base;
102 }
103
104
105 addr = mm->free_area_cache & HPAGE_MASK;
106
107
108 if (likely(addr > len)) {
109 vma = find_vma(mm, addr-len);
110 if (!vma || addr <= vma->vm_start) {
111
112 return (mm->free_area_cache = addr-len);
113 }
114 }
115
116 if (unlikely(mm->mmap_base < len))
117 goto bottomup;
118
119 addr = (mm->mmap_base-len) & HPAGE_MASK;
120
121 do {
122
123
124
125
126
127 vma = find_vma(mm, addr);
128 if (likely(!vma || addr+len <= vma->vm_start)) {
129
130 return (mm->free_area_cache = addr);
131 }
132
133
134 if (addr + mm->cached_hole_size < vma->vm_start)
135 mm->cached_hole_size = vma->vm_start - addr;
136
137
138 addr = (vma->vm_start-len) & HPAGE_MASK;
139 } while (likely(len < vma->vm_start));
140
141bottomup:
142
143
144
145
146
147
148 mm->cached_hole_size = ~0UL;
149 mm->free_area_cache = TASK_UNMAPPED_BASE;
150 addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
151
152
153
154 mm->free_area_cache = mm->mmap_base;
155 mm->cached_hole_size = ~0UL;
156
157 return addr;
158}
159
160unsigned long
161hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
162 unsigned long len, unsigned long pgoff, unsigned long flags)
163{
164 struct mm_struct *mm = current->mm;
165 struct vm_area_struct *vma;
166 unsigned long task_size = TASK_SIZE;
167
168 if (test_thread_flag(TIF_32BIT))
169 task_size = STACK_TOP32;
170
171 if (len & ~HPAGE_MASK)
172 return -EINVAL;
173 if (len > task_size)
174 return -ENOMEM;
175
176 if (flags & MAP_FIXED) {
177 if (prepare_hugepage_range(file, addr, len))
178 return -EINVAL;
179 return addr;
180 }
181
182 if (addr) {
183 addr = ALIGN(addr, HPAGE_SIZE);
184 vma = find_vma(mm, addr);
185 if (task_size - len >= addr &&
186 (!vma || addr + len <= vma->vm_start))
187 return addr;
188 }
189 if (mm->get_unmapped_area == arch_get_unmapped_area)
190 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
191 pgoff, flags);
192 else
193 return hugetlb_get_unmapped_area_topdown(file, addr, len,
194 pgoff, flags);
195}
196
197pte_t *huge_pte_alloc(struct mm_struct *mm,
198 unsigned long addr, unsigned long sz)
199{
200 pgd_t *pgd;
201 pud_t *pud;
202 pmd_t *pmd;
203 pte_t *pte = NULL;
204
205
206
207
208
209
210 addr &= HPAGE_MASK;
211
212 pgd = pgd_offset(mm, addr);
213 pud = pud_alloc(mm, pgd, addr);
214 if (pud) {
215 pmd = pmd_alloc(mm, pud, addr);
216 if (pmd)
217 pte = pte_alloc_map(mm, NULL, pmd, addr);
218 }
219 return pte;
220}
221
222pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
223{
224 pgd_t *pgd;
225 pud_t *pud;
226 pmd_t *pmd;
227 pte_t *pte = NULL;
228
229 addr &= HPAGE_MASK;
230
231 pgd = pgd_offset(mm, addr);
232 if (!pgd_none(*pgd)) {
233 pud = pud_offset(pgd, addr);
234 if (!pud_none(*pud)) {
235 pmd = pmd_offset(pud, addr);
236 if (!pmd_none(*pmd))
237 pte = pte_offset_map(pmd, addr);
238 }
239 }
240 return pte;
241}
242
243int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
244{
245 return 0;
246}
247
248void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
249 pte_t *ptep, pte_t entry)
250{
251 int i;
252
253 if (!pte_present(*ptep) && pte_present(entry))
254 mm->context.huge_pte_count++;
255
256 addr &= HPAGE_MASK;
257 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
258 set_pte_at(mm, addr, ptep, entry);
259 ptep++;
260 addr += PAGE_SIZE;
261 pte_val(entry) += PAGE_SIZE;
262 }
263}
264
265pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
266 pte_t *ptep)
267{
268 pte_t entry;
269 int i;
270
271 entry = *ptep;
272 if (pte_present(entry))
273 mm->context.huge_pte_count--;
274
275 addr &= HPAGE_MASK;
276
277 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
278 pte_clear(mm, addr, ptep);
279 addr += PAGE_SIZE;
280 ptep++;
281 }
282
283 return entry;
284}
285
286struct page *follow_huge_addr(struct mm_struct *mm,
287 unsigned long address, int write)
288{
289 return ERR_PTR(-EINVAL);
290}
291
292int pmd_huge(pmd_t pmd)
293{
294 return 0;
295}
296
297int pud_huge(pud_t pud)
298{
299 return 0;
300}
301
302struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
303 pmd_t *pmd, int write)
304{
305 return NULL;
306}
307
308static void context_reload(void *__data)
309{
310 struct mm_struct *mm = __data;
311
312 if (mm == current->mm)
313 load_secondary_context(mm);
314}
315
316void hugetlb_prefault_arch_hook(struct mm_struct *mm)
317{
318 struct tsb_config *tp = &mm->context.tsb_block[MM_TSB_HUGE];
319
320 if (likely(tp->tsb != NULL))
321 return;
322
323 tsb_grow(mm, MM_TSB_HUGE, 0);
324 tsb_context_switch(mm);
325 smp_tsb_sync(mm);
326
327
328
329
330 if (tlb_type == cheetah_plus) {
331 unsigned long ctx;
332
333 spin_lock(&ctx_alloc_lock);
334 ctx = mm->context.sparc64_ctx_val;
335 ctx &= ~CTX_PGSZ_MASK;
336 ctx |= CTX_PGSZ_BASE << CTX_PGSZ0_SHIFT;
337 ctx |= CTX_PGSZ_HUGE << CTX_PGSZ1_SHIFT;
338
339 if (ctx != mm->context.sparc64_ctx_val) {
340
341
342
343
344
345
346 do_flush_tlb_mm(mm);
347
348
349
350
351 mm->context.sparc64_ctx_val = ctx;
352 on_each_cpu(context_reload, mm, 0);
353 }
354 spin_unlock(&ctx_alloc_lock);
355 }
356}
357