1 #ifndef _PPC64_PGTABLE_H
2 #define _PPC64_PGTABLE_H
3
4 /*
5 * This file contains the functions and defines necessary to modify and use
6 * the ppc64 hashed page table.
7 */
8
9 #ifndef __ASSEMBLY__
10 #include <asm/processor.h> /* For TASK_SIZE */
11 #include <asm/mmu.h>
12 #include <asm/page.h>
13 #endif /* __ASSEMBLY__ */
14
15 /* PMD_SHIFT determines what a second-level page table entry can map */
16 #define PMD_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
17 #define PMD_SIZE (1UL << PMD_SHIFT)
18 #define PMD_MASK (~(PMD_SIZE-1))
19
20 /* PGDIR_SHIFT determines what a third-level page table entry can map */
21 #define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3) + (PAGE_SHIFT - 2))
22 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
23 #define PGDIR_MASK (~(PGDIR_SIZE-1))
24
25 /*
26 * Entries per page directory level. The PTE level must use a 64b record
27 * for each page table entry. The PMD and PGD level use a 32b record for
28 * each entry by assuming that each entry is page aligned.
29 */
30 #define PTE_INDEX_SIZE 9
31 #define PMD_INDEX_SIZE 10
32 #define PGD_INDEX_SIZE 10
33
34 #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
35 #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
36 #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
37
38 #if 0
39 /* DRENG / PPPBBB This is a compiler bug!!! */
40 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
41 #else
42 #define USER_PTRS_PER_PGD (1024)
43 #endif
44 #define FIRST_USER_PGD_NR 0
45
46 #define EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
47 PGD_INDEX_SIZE + PAGE_SHIFT)
48
49 /*
50 * Define the address range of the vmalloc VM area.
51 */
52 #define VMALLOC_START (0xD000000000000000)
53 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
54
55 #ifndef CONFIG_SHARED_MEMORY_ADDRESSING
56 #define VMALLOC_END (VMALLOC_START + VALID_EA_BITS)
57 #else
58 #define VMALLOC_END (VMALLOC_START + (VALID_EA_BITS >> 1))
59 #define SMALLOC_START (VMALLOC_START + (VALID_EA_BITS >> 1) + 1)
60 #define SMALLOC_END (VMALLOC_START + VALID_EA_BITS)
61 #define SMALLOC_EA_SHIFT 40
62 #define SMALLOC_ESID_SHIFT 12
63 #endif
64
65 /*
66 * Define the address range of the imalloc VM area.
67 * (used for ioremap)
68 */
69 #define IMALLOC_START (ioremap_bot)
70 #define IMALLOC_VMADDR(x) ((unsigned long)(x))
71 #define IMALLOC_BASE (0xE000000000000000)
72 #define IMALLOC_END (IMALLOC_BASE + VALID_EA_BITS)
73
74 /*
75 * Define the address range mapped virt <-> physical
76 */
77 #define KRANGE_START KERNELBASE
78 #define KRANGE_END (KRANGE_START + VALID_EA_BITS)
79
80 /*
81 * Define the user address range
82 */
83 #define USER_START (0UL)
84 #define USER_END (USER_START + VALID_EA_BITS)
85
86
87 /*
88 * Bits in a linux-style PTE. These match the bits in the
89 * (hardware-defined) PowerPC PTE as closely as possible.
90 */
91 #define _PAGE_PRESENT 0x001UL /* software: pte contains a translation */
92 #define _PAGE_USER 0x002UL /* matches one of the PP bits */
93 #define _PAGE_RW 0x004UL /* software: user write access allowed */
94 #define _PAGE_GUARDED 0x008UL
95 #define _PAGE_COHERENT 0x010UL /* M: enforce memory coherence (SMP systems) */
96 #define _PAGE_NO_CACHE 0x020UL /* I: cache inhibit */
97 #define _PAGE_WRITETHRU 0x040UL /* W: cache write-through */
98 #define _PAGE_DIRTY 0x080UL /* C: page changed */
99 #define _PAGE_ACCESSED 0x100UL /* R: page referenced */
100 #define _PAGE_HPTENOIX 0x200UL /* software: pte HPTE slot unknown */
101 #define _PAGE_HASHPTE 0x400UL /* software: pte has an associated HPTE */
102 #define _PAGE_EXEC 0x800UL /* software: i-cache coherence required */
103 #define _PAGE_SECONDARY 0x8000UL /* software: HPTE is in secondary group */
104 #define _PAGE_GROUP_IX 0x7000UL /* software: HPTE index within group */
105 /* Bits 0x7000 identify the index within an HPT Group */
106 #define _PAGE_HPTEFLAGS (_PAGE_HASHPTE | _PAGE_HPTENOIX | _PAGE_SECONDARY | _PAGE_GROUP_IX)
107 /* PAGE_MASK gives the right answer below, but only by accident */
108 /* It should be preserving the high 48 bits and then specifically */
109 /* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
110 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HPTEFLAGS)
111
112 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
113
114 #define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY)
115
116 /* __pgprot defined in asm-ppc64/page.h */
117 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
118
119 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER)
120 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER | _PAGE_EXEC)
121 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
122 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
123 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
124 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
125 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_WRENABLE)
126 #define PAGE_KERNEL_CI __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
127 _PAGE_WRENABLE | _PAGE_NO_CACHE | _PAGE_GUARDED)
128
129 /*
130 * The PowerPC can only do execute protection on a segment (256MB) basis,
131 * not on a page basis. So we consider execute permission the same as read.
132 * Also, write permissions imply read permissions.
133 * This is the closest we can get..
134 */
135 #define __P000 PAGE_NONE
136 #define __P001 PAGE_READONLY_X
137 #define __P010 PAGE_COPY
138 #define __P011 PAGE_COPY_X
139 #define __P100 PAGE_READONLY
140 #define __P101 PAGE_READONLY_X
141 #define __P110 PAGE_COPY
142 #define __P111 PAGE_COPY_X
143
144 #define __S000 PAGE_NONE
145 #define __S001 PAGE_READONLY_X
146 #define __S010 PAGE_SHARED
147 #define __S011 PAGE_SHARED_X
148 #define __S100 PAGE_READONLY
149 #define __S101 PAGE_READONLY_X
150 #define __S110 PAGE_SHARED
151 #define __S111 PAGE_SHARED_X
152
153 #ifndef __ASSEMBLY__
154
155 /*
156 * ZERO_PAGE is a global shared page that is always zero: used
157 * for zero-mapped memory areas etc..
158 */
159 extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
160 #define ZERO_PAGE(vaddr) (mem_map + MAP_NR(empty_zero_page))
161 #endif /* __ASSEMBLY__ */
162
163 /* shift to put page number into pte */
164 #define PTE_SHIFT (16)
165
166 #ifndef __ASSEMBLY__
167
168 /*
169 * Conversion functions: convert a page and protection to a page entry,
170 * and a page entry and page directory to the page they refer to.
171 *
172 * mk_pte_phys takes a physical address as input
173 *
174 * mk_pte takes a (struct page *) as input
175 */
176
177 #define mk_pte_phys(physpage,pgprot) \
178 ({ \
179 pte_t pte; \
180 pte_val(pte) = (((physpage)<<(PTE_SHIFT-PAGE_SHIFT)) | pgprot_val(pgprot)); \
181 pte; \
182 })
183
184 #define mk_pte(page,pgprot) \
185 ({ \
186 pte_t pte; \
187 pte_val(pte) = ((unsigned long)((page) - mem_map) << PTE_SHIFT) | \
188 pgprot_val(pgprot); \
189 pte; \
190 })
191
192 #define pte_modify(_pte, newprot) \
193 (__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
194
195 #define pte_none(pte) ((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
196 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
197
198 /* pte_clear moved to later in this file */
199
200 #define pte_pagenr(x) ((unsigned long)((pte_val(x) >> PTE_SHIFT)))
201 #define pte_page(x) (mem_map+pte_pagenr(x))
202
203 #define pmd_set(pmdp, ptep) (pmd_val(*(pmdp)) = (__ba_to_bpn(ptep)))
204 #define pmd_none(pmd) (!pmd_val(pmd))
205 #define pmd_bad(pmd) ((pmd_val(pmd)) == 0)
206 #define pmd_present(pmd) ((pmd_val(pmd)) != 0)
207 #define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0)
208 #define pmd_page(pmd) (__bpn_to_ba(pmd_val(pmd)))
209 #define pgd_set(pgdp, pmdp) (pgd_val(*(pgdp)) = (__ba_to_bpn(pmdp)))
210 #define pgd_none(pgd) (!pgd_val(pgd))
211 #define pgd_bad(pgd) ((pgd_val(pgd)) == 0)
212 #define pgd_present(pgd) (pgd_val(pgd) != 0UL)
213 #define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0UL)
214 #define pgd_page(pgd) (__bpn_to_ba(pgd_val(pgd)))
215
216 /*
217 * Find an entry in a page-table-directory. We combine the address region
218 * (the high order N bits) and the pgd portion of the address.
219 */
220 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD -1))
221
222 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
223
224 /* Find an entry in the second-level page table.. */
225 #define pmd_offset(dir,addr) \
226 ((pmd_t *) pgd_page(*(dir)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
227
228 /* Find an entry in the third-level page table.. */
229 #define pte_offset(dir,addr) \
230 ((pte_t *) pmd_page(*(dir)) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
231
232 /* to find an entry in a kernel page-table-directory */
233 /* This now only contains the vmalloc pages */
234 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
235
236 /* to find an entry in the ioremap page-table-directory */
237 #define pgd_offset_i(address) (ioremap_pgd + pgd_index(address))
238
239 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
240
241 /*
242 * The following only work if pte_present() is true.
243 * Undefined behaviour if not..
244 */
pte_read(pte_t pte)245 static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER;}
pte_write(pte_t pte)246 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW;}
pte_exec(pte_t pte)247 static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC;}
pte_dirty(pte_t pte)248 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY;}
pte_young(pte_t pte)249 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED;}
250
pte_uncache(pte_t pte)251 static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
pte_cache(pte_t pte)252 static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; }
253
pte_rdprotect(pte_t pte)254 static inline pte_t pte_rdprotect(pte_t pte) {
255 pte_val(pte) &= ~_PAGE_USER; return pte; }
pte_exprotect(pte_t pte)256 static inline pte_t pte_exprotect(pte_t pte) {
257 pte_val(pte) &= ~_PAGE_EXEC; return pte; }
pte_wrprotect(pte_t pte)258 static inline pte_t pte_wrprotect(pte_t pte) {
259 pte_val(pte) &= ~(_PAGE_RW); return pte; }
pte_mkclean(pte_t pte)260 static inline pte_t pte_mkclean(pte_t pte) {
261 pte_val(pte) &= ~(_PAGE_DIRTY); return pte; }
pte_mkold(pte_t pte)262 static inline pte_t pte_mkold(pte_t pte) {
263 pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
264
pte_mkread(pte_t pte)265 static inline pte_t pte_mkread(pte_t pte) {
266 pte_val(pte) |= _PAGE_USER; return pte; }
pte_mkexec(pte_t pte)267 static inline pte_t pte_mkexec(pte_t pte) {
268 pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; }
pte_mkwrite(pte_t pte)269 static inline pte_t pte_mkwrite(pte_t pte) {
270 pte_val(pte) |= _PAGE_RW; return pte; }
pte_mkdirty(pte_t pte)271 static inline pte_t pte_mkdirty(pte_t pte) {
272 pte_val(pte) |= _PAGE_DIRTY; return pte; }
pte_mkyoung(pte_t pte)273 static inline pte_t pte_mkyoung(pte_t pte) {
274 pte_val(pte) |= _PAGE_ACCESSED; return pte; }
275
276 /* Atomic PTE updates */
277
pte_update(pte_t * p,unsigned long clr,unsigned long set)278 static inline unsigned long pte_update( pte_t *p, unsigned long clr,
279 unsigned long set )
280 {
281 unsigned long old, tmp;
282
283 __asm__ __volatile__("\n\
284 1: ldarx %0,0,%3 \n\
285 andc %1,%0,%4 \n\
286 or %1,%1,%5 \n\
287 stdcx. %1,0,%3 \n\
288 bne- 1b"
289 : "=&r" (old), "=&r" (tmp), "=m" (*p)
290 : "r" (p), "r" (clr), "r" (set), "m" (*p)
291 : "cc" );
292 return old;
293 }
294
ptep_test_and_clear_young(pte_t * ptep)295 static inline int ptep_test_and_clear_young(pte_t *ptep)
296 {
297 return (pte_update(ptep, _PAGE_ACCESSED, 0) & _PAGE_ACCESSED) != 0;
298 }
299
ptep_test_and_clear_dirty(pte_t * ptep)300 static inline int ptep_test_and_clear_dirty(pte_t *ptep)
301 {
302 return (pte_update(ptep, _PAGE_DIRTY, 0) & _PAGE_DIRTY) != 0;
303 }
304
ptep_get_and_clear(pte_t * ptep)305 static inline pte_t ptep_get_and_clear(pte_t *ptep)
306 {
307 return __pte(pte_update(ptep, ~_PAGE_HPTEFLAGS, 0));
308 }
309
ptep_set_wrprotect(pte_t * ptep)310 static inline void ptep_set_wrprotect(pte_t *ptep)
311 {
312 pte_update(ptep, _PAGE_RW, 0);
313 }
314
ptep_mkdirty(pte_t * ptep)315 static inline void ptep_mkdirty(pte_t *ptep)
316 {
317 pte_update(ptep, 0, _PAGE_DIRTY);
318 }
319
320 #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
321
322 /*
323 * set_pte stores a linux PTE into the linux page table.
324 * On machines which use an MMU hash table we avoid changing the
325 * _PAGE_HASHPTE bit.
326 */
set_pte(pte_t * ptep,pte_t pte)327 static inline void set_pte(pte_t *ptep, pte_t pte)
328 {
329 pte_update(ptep, ~_PAGE_HPTEFLAGS, pte_val(pte) & ~_PAGE_HPTEFLAGS);
330 }
331
pte_clear(pte_t * ptep)332 static inline void pte_clear(pte_t * ptep)
333 {
334 pte_update(ptep, ~_PAGE_HPTEFLAGS, 0);
335 }
336
337 struct mm_struct;
338 struct vm_area_struct;
339 extern void local_flush_tlb_all(void);
340 extern void local_flush_tlb_mm(struct mm_struct *mm);
341 extern void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
342 extern void local_flush_tlb_range(struct mm_struct *mm, unsigned long start,
343 unsigned long end);
344
345 #define flush_tlb_all local_flush_tlb_all
346 #define flush_tlb_mm local_flush_tlb_mm
347 #define flush_tlb_page local_flush_tlb_page
348 #define flush_tlb_range local_flush_tlb_range
349
flush_tlb_pgtables(struct mm_struct * mm,unsigned long start,unsigned long end)350 static inline void flush_tlb_pgtables(struct mm_struct *mm,
351 unsigned long start, unsigned long end)
352 {
353 /* PPC has hw page tables. */
354 }
355
356 /*
357 * No cache flushing is required when address mappings are
358 * changed, because the caches on PowerPCs are physically
359 * addressed.
360 */
361 #define flush_cache_all() do { } while (0)
362 #define flush_cache_mm(mm) do { } while (0)
363 #define flush_cache_range(mm, a, b) do { } while (0)
364 #define flush_cache_page(vma, p) do { } while (0)
365 #define flush_page_to_ram(page) do { } while (0)
366
367 extern void flush_icache_user_range(struct vm_area_struct *vma,
368 struct page *page, unsigned long addr, int len);
369 extern void flush_icache_range(unsigned long, unsigned long);
370 extern void __flush_dcache_icache(void *page_va);
371 extern void flush_dcache_page(struct page *page);
372 extern void flush_icache_page(struct vm_area_struct *vma, struct page *page);
373
374 extern unsigned long va_to_phys(unsigned long address);
375 extern pte_t *va_to_pte(unsigned long address);
376 extern unsigned long ioremap_bot, ioremap_base;
377
378 #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
379 #define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
380
381 #define pte_ERROR(e) \
382 printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
383 #define pmd_ERROR(e) \
384 printk("%s:%d: bad pmd %08x.\n", __FILE__, __LINE__, pmd_val(e))
385 #define pgd_ERROR(e) \
386 printk("%s:%d: bad pgd %08x.\n", __FILE__, __LINE__, pgd_val(e))
387
388 extern pgd_t swapper_pg_dir[1024];
389 extern pgd_t ioremap_dir[1024];
390
391 extern void paging_init(void);
392
393 /*
394 * Page tables may have changed. We don't need to do anything here
395 * as entries are faulted into the hash table by the low-level
396 * data/instruction access exception handlers.
397 */
398 /*
399 * We won't be able to use update_mmu_cache to update the
400 * hardware page table because we need to update the pte
401 * as well, but we don't get the address of the pte, only
402 * its value.
403 */
404 #define update_mmu_cache(vma, addr, pte) do { } while (0)
405
406 extern void flush_hash_segments(unsigned low_vsid, unsigned high_vsid);
407 extern void flush_hash_page(unsigned long context, unsigned long ea, pte_t *ptep);
408 extern void build_valid_hpte(unsigned long vsid, unsigned long ea,
409 unsigned long pa, pte_t * ptep,
410 unsigned hpteflags, unsigned bolted );
411
412 /* Encode and de-code a swap entry */
413 #define SWP_TYPE(entry) (((entry).val >> 1) & 0x3f)
414 #define SWP_OFFSET(entry) ((entry).val >> 8)
415 #define SWP_ENTRY(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
416 #define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> PTE_SHIFT })
417 #define swp_entry_to_pte(x) ((pte_t) { (x).val << PTE_SHIFT })
418
419 /*
420 * kern_addr_valid is intended to indicate whether an address is a valid
421 * kernel address. Most 32-bit archs define it as always true (like this)
422 * but most 64-bit archs actually perform a test. What should we do here?
423 * The only use is in fs/ncpfs/dir.c
424 */
425 #define kern_addr_valid(addr) (1)
426
427 #ifdef CONFIG_PPC_ISERIES
428 #define io_remap_page_range remap_page_range
429 #else
430 extern int io_remap_page_range(unsigned long from, unsigned long to, unsigned long size, pgprot_t prot);
431 #endif
432
433 /*
434 * No page table caches to initialise
435 */
436 #define pgtable_cache_init() do { } while (0)
437
438 extern void updateBoltedHptePP(unsigned long newpp, unsigned long ea);
439 extern void hpte_init_pSeries(void);
440 extern void hpte_init_iSeries(void);
441
442 extern void make_pte(HPTE * htab, unsigned long va, unsigned long pa,
443 int mode, unsigned long hash_mask, int large);
444
445 #endif /* __ASSEMBLY__ */
446 #endif /* _PPC64_PGTABLE_H */
447