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17ed9e31 AK |
1 | #ifndef _ASM_POWERPC_NOHASH_32_PGTABLE_H |
2 | #define _ASM_POWERPC_NOHASH_32_PGTABLE_H | |
f88df14b | 3 | |
d1953c88 | 4 | #include <asm-generic/pgtable-nopmd.h> |
f88df14b DG |
5 | |
6 | #ifndef __ASSEMBLY__ | |
7 | #include <linux/sched.h> | |
8 | #include <linux/threads.h> | |
f88df14b | 9 | #include <asm/io.h> /* For sub-arch specific PPC_PIN_SIZE */ |
f88df14b | 10 | |
f637a49e | 11 | extern unsigned long ioremap_bot; |
b98ac05d BH |
12 | |
13 | #ifdef CONFIG_44x | |
14 | extern int icache_44x_need_flush; | |
15 | #endif | |
16 | ||
f88df14b DG |
17 | #endif /* __ASSEMBLY__ */ |
18 | ||
9b081e10 CL |
19 | #define PTE_INDEX_SIZE PTE_SHIFT |
20 | #define PMD_INDEX_SIZE 0 | |
21 | #define PUD_INDEX_SIZE 0 | |
22 | #define PGD_INDEX_SIZE (32 - PGDIR_SHIFT) | |
23 | ||
24 | #define PMD_CACHE_INDEX PMD_INDEX_SIZE | |
25 | ||
26 | #ifndef __ASSEMBLY__ | |
27 | #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE) | |
28 | #define PMD_TABLE_SIZE 0 | |
29 | #define PUD_TABLE_SIZE 0 | |
30 | #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE) | |
31 | #endif /* __ASSEMBLY__ */ | |
32 | ||
33 | #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE) | |
34 | #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE) | |
35 | ||
f88df14b DG |
36 | /* |
37 | * The normal case is that PTEs are 32-bits and we have a 1-page | |
38 | * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus | |
39 | * | |
40 | * For any >32-bit physical address platform, we can use the following | |
41 | * two level page table layout where the pgdir is 8KB and the MS 13 bits | |
42 | * are an index to the second level table. The combined pgdir/pmd first | |
43 | * level has 2048 entries and the second level has 512 64-bit PTE entries. | |
44 | * -Matt | |
45 | */ | |
f88df14b | 46 | /* PGDIR_SHIFT determines what a top-level page table entry can map */ |
9b081e10 | 47 | #define PGDIR_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE) |
f88df14b DG |
48 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
49 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | |
50 | ||
9b081e10 CL |
51 | /* Bits to mask out from a PGD to get to the PUD page */ |
52 | #define PGD_MASKED_BITS 0 | |
f88df14b DG |
53 | |
54 | #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) | |
d016bf7e | 55 | #define FIRST_USER_ADDRESS 0UL |
f88df14b | 56 | |
f88df14b | 57 | #define pte_ERROR(e) \ |
a7696b36 | 58 | pr_err("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \ |
0aeafb0c | 59 | (unsigned long long)pte_val(e)) |
f88df14b | 60 | #define pgd_ERROR(e) \ |
a7696b36 | 61 | pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
f88df14b | 62 | |
f637a49e BH |
63 | /* |
64 | * This is the bottom of the PKMAP area with HIGHMEM or an arbitrary | |
65 | * value (for now) on others, from where we can start layout kernel | |
66 | * virtual space that goes below PKMAP and FIXMAP | |
67 | */ | |
68 | #ifdef CONFIG_HIGHMEM | |
69 | #define KVIRT_TOP PKMAP_BASE | |
70 | #else | |
71 | #define KVIRT_TOP (0xfe000000UL) /* for now, could be FIXMAP_BASE ? */ | |
72 | #endif | |
73 | ||
74 | /* | |
75 | * ioremap_bot starts at that address. Early ioremaps move down from there, | |
76 | * until mem_init() at which point this becomes the top of the vmalloc | |
77 | * and ioremap space | |
78 | */ | |
8b31e49d BH |
79 | #ifdef CONFIG_NOT_COHERENT_CACHE |
80 | #define IOREMAP_TOP ((KVIRT_TOP - CONFIG_CONSISTENT_SIZE) & PAGE_MASK) | |
81 | #else | |
f637a49e | 82 | #define IOREMAP_TOP KVIRT_TOP |
8b31e49d | 83 | #endif |
f637a49e | 84 | |
f88df14b DG |
85 | /* |
86 | * Just any arbitrary offset to the start of the vmalloc VM area: the | |
f637a49e | 87 | * current 16MB value just means that there will be a 64MB "hole" after the |
f88df14b DG |
88 | * physical memory until the kernel virtual memory starts. That means that |
89 | * any out-of-bounds memory accesses will hopefully be caught. | |
90 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced | |
91 | * area for the same reason. ;) | |
92 | * | |
93 | * We no longer map larger than phys RAM with the BATs so we don't have | |
94 | * to worry about the VMALLOC_OFFSET causing problems. We do have to worry | |
95 | * about clashes between our early calls to ioremap() that start growing down | |
e974cd4b | 96 | * from IOREMAP_TOP being run into the VM area allocations (growing upwards |
f88df14b DG |
97 | * from VMALLOC_START). For this reason we have ioremap_bot to check when |
98 | * we actually run into our mappings setup in the early boot with the VM | |
99 | * system. This really does become a problem for machines with good amounts | |
100 | * of RAM. -- Cort | |
101 | */ | |
102 | #define VMALLOC_OFFSET (0x1000000) /* 16M */ | |
103 | #ifdef PPC_PIN_SIZE | |
104 | #define VMALLOC_START (((_ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))) | |
105 | #else | |
106 | #define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))) | |
107 | #endif | |
108 | #define VMALLOC_END ioremap_bot | |
109 | ||
110 | /* | |
111 | * Bits in a linux-style PTE. These match the bits in the | |
112 | * (hardware-defined) PowerPC PTE as closely as possible. | |
113 | */ | |
114 | ||
115 | #if defined(CONFIG_40x) | |
17ed9e31 | 116 | #include <asm/nohash/32/pte-40x.h> |
f88df14b | 117 | #elif defined(CONFIG_44x) |
17ed9e31 | 118 | #include <asm/nohash/32/pte-44x.h> |
76acc2c1 | 119 | #elif defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT) |
17ed9e31 | 120 | #include <asm/nohash/pte-book3e.h> |
f88df14b | 121 | #elif defined(CONFIG_FSL_BOOKE) |
17ed9e31 | 122 | #include <asm/nohash/32/pte-fsl-booke.h> |
f88df14b | 123 | #elif defined(CONFIG_8xx) |
17ed9e31 | 124 | #include <asm/nohash/32/pte-8xx.h> |
4ee7084e | 125 | #endif |
f88df14b | 126 | |
71087002 BH |
127 | /* And here we include common definitions */ |
128 | #include <asm/pte-common.h> | |
f88df14b DG |
129 | |
130 | #ifndef __ASSEMBLY__ | |
f88df14b | 131 | |
9bf2b5cd KG |
132 | #define pte_clear(mm, addr, ptep) \ |
133 | do { pte_update(ptep, ~_PAGE_HASHPTE, 0); } while (0) | |
f88df14b DG |
134 | |
135 | #define pmd_none(pmd) (!pmd_val(pmd)) | |
136 | #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD) | |
137 | #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK) | |
f281b5d5 AK |
138 | static inline void pmd_clear(pmd_t *pmdp) |
139 | { | |
140 | *pmdp = __pmd(0); | |
141 | } | |
142 | ||
143 | ||
f88df14b | 144 | |
f88df14b DG |
145 | /* |
146 | * When flushing the tlb entry for a page, we also need to flush the hash | |
147 | * table entry. flush_hash_pages is assembler (for speed) in hashtable.S. | |
148 | */ | |
149 | extern int flush_hash_pages(unsigned context, unsigned long va, | |
150 | unsigned long pmdval, int count); | |
151 | ||
152 | /* Add an HPTE to the hash table */ | |
153 | extern void add_hash_page(unsigned context, unsigned long va, | |
154 | unsigned long pmdval); | |
155 | ||
4ee7084e BB |
156 | /* Flush an entry from the TLB/hash table */ |
157 | extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, | |
158 | unsigned long address); | |
159 | ||
f88df14b | 160 | /* |
c605782b BH |
161 | * PTE updates. This function is called whenever an existing |
162 | * valid PTE is updated. This does -not- include set_pte_at() | |
163 | * which nowadays only sets a new PTE. | |
164 | * | |
165 | * Depending on the type of MMU, we may need to use atomic updates | |
166 | * and the PTE may be either 32 or 64 bit wide. In the later case, | |
167 | * when using atomic updates, only the low part of the PTE is | |
168 | * accessed atomically. | |
f88df14b | 169 | * |
c605782b BH |
170 | * In addition, on 44x, we also maintain a global flag indicating |
171 | * that an executable user mapping was modified, which is needed | |
172 | * to properly flush the virtually tagged instruction cache of | |
173 | * those implementations. | |
f88df14b DG |
174 | */ |
175 | #ifndef CONFIG_PTE_64BIT | |
1bc54c03 BH |
176 | static inline unsigned long pte_update(pte_t *p, |
177 | unsigned long clr, | |
f88df14b DG |
178 | unsigned long set) |
179 | { | |
1bc54c03 | 180 | #ifdef PTE_ATOMIC_UPDATES |
f88df14b DG |
181 | unsigned long old, tmp; |
182 | ||
183 | __asm__ __volatile__("\ | |
184 | 1: lwarx %0,0,%3\n\ | |
185 | andc %1,%0,%4\n\ | |
186 | or %1,%1,%5\n" | |
187 | PPC405_ERR77(0,%3) | |
188 | " stwcx. %1,0,%3\n\ | |
189 | bne- 1b" | |
190 | : "=&r" (old), "=&r" (tmp), "=m" (*p) | |
191 | : "r" (p), "r" (clr), "r" (set), "m" (*p) | |
192 | : "cc" ); | |
1bc54c03 BH |
193 | #else /* PTE_ATOMIC_UPDATES */ |
194 | unsigned long old = pte_val(*p); | |
195 | *p = __pte((old & ~clr) | set); | |
196 | #endif /* !PTE_ATOMIC_UPDATES */ | |
197 | ||
b98ac05d | 198 | #ifdef CONFIG_44x |
ea3cc330 | 199 | if ((old & _PAGE_USER) && (old & _PAGE_EXEC)) |
b98ac05d BH |
200 | icache_44x_need_flush = 1; |
201 | #endif | |
f88df14b DG |
202 | return old; |
203 | } | |
1bc54c03 | 204 | #else /* CONFIG_PTE_64BIT */ |
1bc54c03 BH |
205 | static inline unsigned long long pte_update(pte_t *p, |
206 | unsigned long clr, | |
207 | unsigned long set) | |
f88df14b | 208 | { |
1bc54c03 | 209 | #ifdef PTE_ATOMIC_UPDATES |
f88df14b DG |
210 | unsigned long long old; |
211 | unsigned long tmp; | |
212 | ||
213 | __asm__ __volatile__("\ | |
214 | 1: lwarx %L0,0,%4\n\ | |
215 | lwzx %0,0,%3\n\ | |
216 | andc %1,%L0,%5\n\ | |
217 | or %1,%1,%6\n" | |
218 | PPC405_ERR77(0,%3) | |
219 | " stwcx. %1,0,%4\n\ | |
220 | bne- 1b" | |
221 | : "=&r" (old), "=&r" (tmp), "=m" (*p) | |
222 | : "r" (p), "r" ((unsigned long)(p) + 4), "r" (clr), "r" (set), "m" (*p) | |
223 | : "cc" ); | |
1bc54c03 BH |
224 | #else /* PTE_ATOMIC_UPDATES */ |
225 | unsigned long long old = pte_val(*p); | |
585583d9 | 226 | *p = __pte((old & ~(unsigned long long)clr) | set); |
1bc54c03 BH |
227 | #endif /* !PTE_ATOMIC_UPDATES */ |
228 | ||
b98ac05d | 229 | #ifdef CONFIG_44x |
ea3cc330 | 230 | if ((old & _PAGE_USER) && (old & _PAGE_EXEC)) |
b98ac05d BH |
231 | icache_44x_need_flush = 1; |
232 | #endif | |
f88df14b DG |
233 | return old; |
234 | } | |
1bc54c03 | 235 | #endif /* CONFIG_PTE_64BIT */ |
f88df14b | 236 | |
f88df14b | 237 | /* |
bf2737f7 BB |
238 | * 2.6 calls this without flushing the TLB entry; this is wrong |
239 | * for our hash-based implementation, we fix that up here. | |
f88df14b DG |
240 | */ |
241 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
242 | static inline int __ptep_test_and_clear_young(unsigned int context, unsigned long addr, pte_t *ptep) | |
243 | { | |
244 | unsigned long old; | |
245 | old = pte_update(ptep, _PAGE_ACCESSED, 0); | |
246 | #if _PAGE_HASHPTE != 0 | |
247 | if (old & _PAGE_HASHPTE) { | |
248 | unsigned long ptephys = __pa(ptep) & PAGE_MASK; | |
249 | flush_hash_pages(context, addr, ptephys, 1); | |
250 | } | |
251 | #endif | |
252 | return (old & _PAGE_ACCESSED) != 0; | |
253 | } | |
254 | #define ptep_test_and_clear_young(__vma, __addr, __ptep) \ | |
255 | __ptep_test_and_clear_young((__vma)->vm_mm->context.id, __addr, __ptep) | |
256 | ||
f88df14b DG |
257 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
258 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, | |
259 | pte_t *ptep) | |
260 | { | |
261 | return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0)); | |
262 | } | |
263 | ||
264 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT | |
265 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, | |
266 | pte_t *ptep) | |
267 | { | |
a7b9f671 | 268 | pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), _PAGE_RO); |
f88df14b | 269 | } |
016b33c4 AW |
270 | static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
271 | unsigned long addr, pte_t *ptep) | |
272 | { | |
273 | ptep_set_wrprotect(mm, addr, ptep); | |
274 | } | |
275 | ||
f88df14b | 276 | |
c6d1a767 | 277 | static inline void __ptep_set_access_flags(struct mm_struct *mm, |
b3603e17 AK |
278 | pte_t *ptep, pte_t entry, |
279 | unsigned long address) | |
f88df14b | 280 | { |
a7b9f671 | 281 | unsigned long set = pte_val(entry) & |
ea3cc330 | 282 | (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); |
a7b9f671 LC |
283 | unsigned long clr = ~pte_val(entry) & _PAGE_RO; |
284 | ||
285 | pte_update(ptep, clr, set); | |
f88df14b DG |
286 | } |
287 | ||
f88df14b DG |
288 | #define __HAVE_ARCH_PTE_SAME |
289 | #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0) | |
290 | ||
291 | /* | |
292 | * Note that on Book E processors, the pmd contains the kernel virtual | |
293 | * (lowmem) address of the pte page. The physical address is less useful | |
294 | * because everything runs with translation enabled (even the TLB miss | |
295 | * handler). On everything else the pmd contains the physical address | |
296 | * of the pte page. -- paulus | |
297 | */ | |
298 | #ifndef CONFIG_BOOKE | |
299 | #define pmd_page_vaddr(pmd) \ | |
300 | ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) | |
301 | #define pmd_page(pmd) \ | |
43b5fefc | 302 | pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT) |
f88df14b DG |
303 | #else |
304 | #define pmd_page_vaddr(pmd) \ | |
305 | ((unsigned long) (pmd_val(pmd) & PAGE_MASK)) | |
306 | #define pmd_page(pmd) \ | |
af892e0f | 307 | pfn_to_page((__pa(pmd_val(pmd)) >> PAGE_SHIFT)) |
f88df14b DG |
308 | #endif |
309 | ||
310 | /* to find an entry in a kernel page-table-directory */ | |
311 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
312 | ||
313 | /* to find an entry in a page-table-directory */ | |
314 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) | |
315 | #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) | |
316 | ||
f88df14b DG |
317 | /* Find an entry in the third-level page table.. */ |
318 | #define pte_index(address) \ | |
319 | (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
320 | #define pte_offset_kernel(dir, addr) \ | |
be00ed72 CL |
321 | (pmd_bad(*(dir)) ? NULL : (pte_t *)pmd_page_vaddr(*(dir)) + \ |
322 | pte_index(addr)) | |
f88df14b | 323 | #define pte_offset_map(dir, addr) \ |
ece0e2b6 PZ |
324 | ((pte_t *) kmap_atomic(pmd_page(*(dir))) + pte_index(addr)) |
325 | #define pte_unmap(pte) kunmap_atomic(pte) | |
f88df14b | 326 | |
f88df14b DG |
327 | /* |
328 | * Encode and decode a swap entry. | |
329 | * Note that the bits we use in a PTE for representing a swap entry | |
780fc564 KS |
330 | * must not include the _PAGE_PRESENT bit or the _PAGE_HASHPTE bit (if used). |
331 | * -- paulus | |
f88df14b DG |
332 | */ |
333 | #define __swp_type(entry) ((entry).val & 0x1f) | |
334 | #define __swp_offset(entry) ((entry).val >> 5) | |
335 | #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) }) | |
336 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 }) | |
337 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 }) | |
338 | ||
f88df14b DG |
339 | extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, |
340 | pmd_t **pmdp); | |
341 | ||
342 | #endif /* !__ASSEMBLY__ */ | |
343 | ||
17ed9e31 | 344 | #endif /* __ASM_POWERPC_NOHASH_32_PGTABLE_H */ |