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f88df14b DG |
1 | #ifndef _ASM_POWERPC_PGTABLE_PPC32_H |
2 | #define _ASM_POWERPC_PGTABLE_PPC32_H | |
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 DG |
10 | |
11 | extern unsigned long va_to_phys(unsigned long address); | |
12 | extern pte_t *va_to_pte(unsigned long address); | |
f637a49e | 13 | extern unsigned long ioremap_bot; |
b98ac05d BH |
14 | |
15 | #ifdef CONFIG_44x | |
16 | extern int icache_44x_need_flush; | |
17 | #endif | |
18 | ||
f88df14b DG |
19 | #endif /* __ASSEMBLY__ */ |
20 | ||
f88df14b DG |
21 | /* |
22 | * The normal case is that PTEs are 32-bits and we have a 1-page | |
23 | * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus | |
24 | * | |
25 | * For any >32-bit physical address platform, we can use the following | |
26 | * two level page table layout where the pgdir is 8KB and the MS 13 bits | |
27 | * are an index to the second level table. The combined pgdir/pmd first | |
28 | * level has 2048 entries and the second level has 512 64-bit PTE entries. | |
29 | * -Matt | |
30 | */ | |
f88df14b | 31 | /* PGDIR_SHIFT determines what a top-level page table entry can map */ |
d1953c88 | 32 | #define PGDIR_SHIFT (PAGE_SHIFT + PTE_SHIFT) |
f88df14b DG |
33 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
34 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | |
35 | ||
36 | /* | |
37 | * entries per page directory level: our page-table tree is two-level, so | |
38 | * we don't really have any PMD directory. | |
39 | */ | |
bee86f14 KG |
40 | #ifndef __ASSEMBLY__ |
41 | #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_SHIFT) | |
42 | #define PGD_TABLE_SIZE (sizeof(pgd_t) << (32 - PGDIR_SHIFT)) | |
43 | #endif /* __ASSEMBLY__ */ | |
44 | ||
f88df14b DG |
45 | #define PTRS_PER_PTE (1 << PTE_SHIFT) |
46 | #define PTRS_PER_PMD 1 | |
47 | #define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT)) | |
48 | ||
49 | #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) | |
50 | #define FIRST_USER_ADDRESS 0 | |
51 | ||
f88df14b | 52 | #define pte_ERROR(e) \ |
0aeafb0c DG |
53 | printk("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \ |
54 | (unsigned long long)pte_val(e)) | |
f88df14b DG |
55 | #define pgd_ERROR(e) \ |
56 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) | |
57 | ||
f637a49e BH |
58 | /* |
59 | * This is the bottom of the PKMAP area with HIGHMEM or an arbitrary | |
60 | * value (for now) on others, from where we can start layout kernel | |
61 | * virtual space that goes below PKMAP and FIXMAP | |
62 | */ | |
63 | #ifdef CONFIG_HIGHMEM | |
64 | #define KVIRT_TOP PKMAP_BASE | |
65 | #else | |
66 | #define KVIRT_TOP (0xfe000000UL) /* for now, could be FIXMAP_BASE ? */ | |
67 | #endif | |
68 | ||
69 | /* | |
70 | * ioremap_bot starts at that address. Early ioremaps move down from there, | |
71 | * until mem_init() at which point this becomes the top of the vmalloc | |
72 | * and ioremap space | |
73 | */ | |
8b31e49d BH |
74 | #ifdef CONFIG_NOT_COHERENT_CACHE |
75 | #define IOREMAP_TOP ((KVIRT_TOP - CONFIG_CONSISTENT_SIZE) & PAGE_MASK) | |
76 | #else | |
f637a49e | 77 | #define IOREMAP_TOP KVIRT_TOP |
8b31e49d | 78 | #endif |
f637a49e | 79 | |
f88df14b DG |
80 | /* |
81 | * Just any arbitrary offset to the start of the vmalloc VM area: the | |
f637a49e | 82 | * current 16MB value just means that there will be a 64MB "hole" after the |
f88df14b DG |
83 | * physical memory until the kernel virtual memory starts. That means that |
84 | * any out-of-bounds memory accesses will hopefully be caught. | |
85 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced | |
86 | * area for the same reason. ;) | |
87 | * | |
88 | * We no longer map larger than phys RAM with the BATs so we don't have | |
89 | * to worry about the VMALLOC_OFFSET causing problems. We do have to worry | |
90 | * about clashes between our early calls to ioremap() that start growing down | |
91 | * from ioremap_base being run into the VM area allocations (growing upwards | |
92 | * from VMALLOC_START). For this reason we have ioremap_bot to check when | |
93 | * we actually run into our mappings setup in the early boot with the VM | |
94 | * system. This really does become a problem for machines with good amounts | |
95 | * of RAM. -- Cort | |
96 | */ | |
97 | #define VMALLOC_OFFSET (0x1000000) /* 16M */ | |
98 | #ifdef PPC_PIN_SIZE | |
99 | #define VMALLOC_START (((_ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))) | |
100 | #else | |
101 | #define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))) | |
102 | #endif | |
103 | #define VMALLOC_END ioremap_bot | |
104 | ||
105 | /* | |
106 | * Bits in a linux-style PTE. These match the bits in the | |
107 | * (hardware-defined) PowerPC PTE as closely as possible. | |
108 | */ | |
109 | ||
110 | #if defined(CONFIG_40x) | |
c605782b | 111 | #include <asm/pte-40x.h> |
f88df14b | 112 | #elif defined(CONFIG_44x) |
c605782b | 113 | #include <asm/pte-44x.h> |
76acc2c1 KG |
114 | #elif defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT) |
115 | #include <asm/pte-book3e.h> | |
f88df14b | 116 | #elif defined(CONFIG_FSL_BOOKE) |
c605782b | 117 | #include <asm/pte-fsl-booke.h> |
f88df14b | 118 | #elif defined(CONFIG_8xx) |
c605782b | 119 | #include <asm/pte-8xx.h> |
f88df14b | 120 | #else /* CONFIG_6xx */ |
c605782b | 121 | #include <asm/pte-hash32.h> |
4ee7084e | 122 | #endif |
f88df14b | 123 | |
71087002 BH |
124 | /* And here we include common definitions */ |
125 | #include <asm/pte-common.h> | |
f88df14b DG |
126 | |
127 | #ifndef __ASSEMBLY__ | |
f88df14b | 128 | |
9bf2b5cd KG |
129 | #define pte_clear(mm, addr, ptep) \ |
130 | do { pte_update(ptep, ~_PAGE_HASHPTE, 0); } while (0) | |
f88df14b DG |
131 | |
132 | #define pmd_none(pmd) (!pmd_val(pmd)) | |
133 | #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD) | |
134 | #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK) | |
135 | #define pmd_clear(pmdp) do { pmd_val(*(pmdp)) = 0; } while (0) | |
136 | ||
f88df14b DG |
137 | /* |
138 | * When flushing the tlb entry for a page, we also need to flush the hash | |
139 | * table entry. flush_hash_pages is assembler (for speed) in hashtable.S. | |
140 | */ | |
141 | extern int flush_hash_pages(unsigned context, unsigned long va, | |
142 | unsigned long pmdval, int count); | |
143 | ||
144 | /* Add an HPTE to the hash table */ | |
145 | extern void add_hash_page(unsigned context, unsigned long va, | |
146 | unsigned long pmdval); | |
147 | ||
4ee7084e BB |
148 | /* Flush an entry from the TLB/hash table */ |
149 | extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, | |
150 | unsigned long address); | |
151 | ||
f88df14b | 152 | /* |
c605782b BH |
153 | * PTE updates. This function is called whenever an existing |
154 | * valid PTE is updated. This does -not- include set_pte_at() | |
155 | * which nowadays only sets a new PTE. | |
156 | * | |
157 | * Depending on the type of MMU, we may need to use atomic updates | |
158 | * and the PTE may be either 32 or 64 bit wide. In the later case, | |
159 | * when using atomic updates, only the low part of the PTE is | |
160 | * accessed atomically. | |
f88df14b | 161 | * |
c605782b BH |
162 | * In addition, on 44x, we also maintain a global flag indicating |
163 | * that an executable user mapping was modified, which is needed | |
164 | * to properly flush the virtually tagged instruction cache of | |
165 | * those implementations. | |
f88df14b DG |
166 | */ |
167 | #ifndef CONFIG_PTE_64BIT | |
1bc54c03 BH |
168 | static inline unsigned long pte_update(pte_t *p, |
169 | unsigned long clr, | |
f88df14b DG |
170 | unsigned long set) |
171 | { | |
1bc54c03 | 172 | #ifdef PTE_ATOMIC_UPDATES |
f88df14b DG |
173 | unsigned long old, tmp; |
174 | ||
175 | __asm__ __volatile__("\ | |
176 | 1: lwarx %0,0,%3\n\ | |
177 | andc %1,%0,%4\n\ | |
178 | or %1,%1,%5\n" | |
179 | PPC405_ERR77(0,%3) | |
180 | " stwcx. %1,0,%3\n\ | |
181 | bne- 1b" | |
182 | : "=&r" (old), "=&r" (tmp), "=m" (*p) | |
183 | : "r" (p), "r" (clr), "r" (set), "m" (*p) | |
184 | : "cc" ); | |
1bc54c03 BH |
185 | #else /* PTE_ATOMIC_UPDATES */ |
186 | unsigned long old = pte_val(*p); | |
187 | *p = __pte((old & ~clr) | set); | |
188 | #endif /* !PTE_ATOMIC_UPDATES */ | |
189 | ||
b98ac05d | 190 | #ifdef CONFIG_44x |
ea3cc330 | 191 | if ((old & _PAGE_USER) && (old & _PAGE_EXEC)) |
b98ac05d BH |
192 | icache_44x_need_flush = 1; |
193 | #endif | |
f88df14b DG |
194 | return old; |
195 | } | |
1bc54c03 | 196 | #else /* CONFIG_PTE_64BIT */ |
1bc54c03 BH |
197 | static inline unsigned long long pte_update(pte_t *p, |
198 | unsigned long clr, | |
199 | unsigned long set) | |
f88df14b | 200 | { |
1bc54c03 | 201 | #ifdef PTE_ATOMIC_UPDATES |
f88df14b DG |
202 | unsigned long long old; |
203 | unsigned long tmp; | |
204 | ||
205 | __asm__ __volatile__("\ | |
206 | 1: lwarx %L0,0,%4\n\ | |
207 | lwzx %0,0,%3\n\ | |
208 | andc %1,%L0,%5\n\ | |
209 | or %1,%1,%6\n" | |
210 | PPC405_ERR77(0,%3) | |
211 | " stwcx. %1,0,%4\n\ | |
212 | bne- 1b" | |
213 | : "=&r" (old), "=&r" (tmp), "=m" (*p) | |
214 | : "r" (p), "r" ((unsigned long)(p) + 4), "r" (clr), "r" (set), "m" (*p) | |
215 | : "cc" ); | |
1bc54c03 BH |
216 | #else /* PTE_ATOMIC_UPDATES */ |
217 | unsigned long long old = pte_val(*p); | |
585583d9 | 218 | *p = __pte((old & ~(unsigned long long)clr) | set); |
1bc54c03 BH |
219 | #endif /* !PTE_ATOMIC_UPDATES */ |
220 | ||
b98ac05d | 221 | #ifdef CONFIG_44x |
ea3cc330 | 222 | if ((old & _PAGE_USER) && (old & _PAGE_EXEC)) |
b98ac05d BH |
223 | icache_44x_need_flush = 1; |
224 | #endif | |
f88df14b DG |
225 | return old; |
226 | } | |
1bc54c03 | 227 | #endif /* CONFIG_PTE_64BIT */ |
f88df14b | 228 | |
f88df14b | 229 | /* |
bf2737f7 BB |
230 | * 2.6 calls this without flushing the TLB entry; this is wrong |
231 | * for our hash-based implementation, we fix that up here. | |
f88df14b DG |
232 | */ |
233 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
234 | static inline int __ptep_test_and_clear_young(unsigned int context, unsigned long addr, pte_t *ptep) | |
235 | { | |
236 | unsigned long old; | |
237 | old = pte_update(ptep, _PAGE_ACCESSED, 0); | |
238 | #if _PAGE_HASHPTE != 0 | |
239 | if (old & _PAGE_HASHPTE) { | |
240 | unsigned long ptephys = __pa(ptep) & PAGE_MASK; | |
241 | flush_hash_pages(context, addr, ptephys, 1); | |
242 | } | |
243 | #endif | |
244 | return (old & _PAGE_ACCESSED) != 0; | |
245 | } | |
246 | #define ptep_test_and_clear_young(__vma, __addr, __ptep) \ | |
247 | __ptep_test_and_clear_young((__vma)->vm_mm->context.id, __addr, __ptep) | |
248 | ||
f88df14b DG |
249 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
250 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, | |
251 | pte_t *ptep) | |
252 | { | |
253 | return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0)); | |
254 | } | |
255 | ||
256 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT | |
257 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, | |
258 | pte_t *ptep) | |
259 | { | |
260 | pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), 0); | |
261 | } | |
016b33c4 AW |
262 | static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
263 | unsigned long addr, pte_t *ptep) | |
264 | { | |
265 | ptep_set_wrprotect(mm, addr, ptep); | |
266 | } | |
267 | ||
f88df14b | 268 | |
8d30c14c | 269 | static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry) |
f88df14b DG |
270 | { |
271 | unsigned long bits = pte_val(entry) & | |
ea3cc330 | 272 | (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); |
f88df14b DG |
273 | pte_update(ptep, 0, bits); |
274 | } | |
275 | ||
f88df14b DG |
276 | #define __HAVE_ARCH_PTE_SAME |
277 | #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0) | |
278 | ||
279 | /* | |
280 | * Note that on Book E processors, the pmd contains the kernel virtual | |
281 | * (lowmem) address of the pte page. The physical address is less useful | |
282 | * because everything runs with translation enabled (even the TLB miss | |
283 | * handler). On everything else the pmd contains the physical address | |
284 | * of the pte page. -- paulus | |
285 | */ | |
286 | #ifndef CONFIG_BOOKE | |
287 | #define pmd_page_vaddr(pmd) \ | |
288 | ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) | |
289 | #define pmd_page(pmd) \ | |
43b5fefc | 290 | pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT) |
f88df14b DG |
291 | #else |
292 | #define pmd_page_vaddr(pmd) \ | |
293 | ((unsigned long) (pmd_val(pmd) & PAGE_MASK)) | |
294 | #define pmd_page(pmd) \ | |
af892e0f | 295 | pfn_to_page((__pa(pmd_val(pmd)) >> PAGE_SHIFT)) |
f88df14b DG |
296 | #endif |
297 | ||
298 | /* to find an entry in a kernel page-table-directory */ | |
299 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
300 | ||
301 | /* to find an entry in a page-table-directory */ | |
302 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) | |
303 | #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) | |
304 | ||
f88df14b DG |
305 | /* Find an entry in the third-level page table.. */ |
306 | #define pte_index(address) \ | |
307 | (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
308 | #define pte_offset_kernel(dir, addr) \ | |
309 | ((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(addr)) | |
310 | #define pte_offset_map(dir, addr) \ | |
ece0e2b6 PZ |
311 | ((pte_t *) kmap_atomic(pmd_page(*(dir))) + pte_index(addr)) |
312 | #define pte_unmap(pte) kunmap_atomic(pte) | |
f88df14b | 313 | |
f88df14b DG |
314 | /* |
315 | * Encode and decode a swap entry. | |
316 | * Note that the bits we use in a PTE for representing a swap entry | |
317 | * must not include the _PAGE_PRESENT bit, the _PAGE_FILE bit, or the | |
318 | *_PAGE_HASHPTE bit (if used). -- paulus | |
319 | */ | |
320 | #define __swp_type(entry) ((entry).val & 0x1f) | |
321 | #define __swp_offset(entry) ((entry).val >> 5) | |
322 | #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) }) | |
323 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 }) | |
324 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 }) | |
325 | ||
326 | /* Encode and decode a nonlinear file mapping entry */ | |
327 | #define PTE_FILE_MAX_BITS 29 | |
328 | #define pte_to_pgoff(pte) (pte_val(pte) >> 3) | |
329 | #define pgoff_to_pte(off) ((pte_t) { ((off) << 3) | _PAGE_FILE }) | |
330 | ||
f88df14b DG |
331 | /* |
332 | * No page table caches to initialise | |
333 | */ | |
334 | #define pgtable_cache_init() do { } while (0) | |
335 | ||
336 | extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, | |
337 | pmd_t **pmdp); | |
338 | ||
339 | #endif /* !__ASSEMBLY__ */ | |
340 | ||
341 | #endif /* _ASM_POWERPC_PGTABLE_PPC32_H */ |