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Linux/arch/sparc/include/asm/pgtable_32.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _SPARC_PGTABLE_H
  3 #define _SPARC_PGTABLE_H
  4 
  5 /*  asm/pgtable.h:  Defines and functions used to work
  6  *                        with Sparc page tables.
  7  *
  8  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
  9  *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 10  */
 11 
 12 #include <linux/const.h>
 13 
 14 #define PMD_SHIFT               18
 15 #define PMD_SIZE                (1UL << PMD_SHIFT)
 16 #define PMD_MASK                (~(PMD_SIZE-1))
 17 #define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
 18 
 19 #define PGDIR_SHIFT             24
 20 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
 21 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
 22 #define PGDIR_ALIGN(__addr)     (((__addr) + ~PGDIR_MASK) & PGDIR_MASK)
 23 
 24 #ifndef __ASSEMBLY__
 25 #include <asm-generic/pgtable-nopud.h>
 26 
 27 #include <linux/spinlock.h>
 28 #include <linux/mm_types.h>
 29 #include <asm/types.h>
 30 #include <asm/pgtsrmmu.h>
 31 #include <asm/vaddrs.h>
 32 #include <asm/oplib.h>
 33 #include <asm/cpu_type.h>
 34 
 35 
 36 struct vm_area_struct;
 37 struct page;
 38 
 39 void load_mmu(void);
 40 unsigned long calc_highpages(void);
 41 unsigned long __init bootmem_init(unsigned long *pages_avail);
 42 
 43 #define pte_ERROR(e)   __builtin_trap()
 44 #define pmd_ERROR(e)   __builtin_trap()
 45 #define pgd_ERROR(e)   __builtin_trap()
 46 
 47 #define PTRS_PER_PTE            64
 48 #define PTRS_PER_PMD            64
 49 #define PTRS_PER_PGD            256
 50 #define USER_PTRS_PER_PGD       PAGE_OFFSET / PGDIR_SIZE
 51 #define PTE_SIZE                (PTRS_PER_PTE*4)
 52 
 53 #define PAGE_NONE       SRMMU_PAGE_NONE
 54 #define PAGE_SHARED     SRMMU_PAGE_SHARED
 55 #define PAGE_COPY       SRMMU_PAGE_COPY
 56 #define PAGE_READONLY   SRMMU_PAGE_RDONLY
 57 #define PAGE_KERNEL     SRMMU_PAGE_KERNEL
 58 
 59 /* Top-level page directory - dummy used by init-mm.
 60  * srmmu.c will assign the real one (which is dynamically sized) */
 61 #define swapper_pg_dir NULL
 62 
 63 void paging_init(void);
 64 
 65 extern unsigned long ptr_in_current_pgd;
 66 
 67 /*         xwr */
 68 #define __P000  PAGE_NONE
 69 #define __P001  PAGE_READONLY
 70 #define __P010  PAGE_COPY
 71 #define __P011  PAGE_COPY
 72 #define __P100  PAGE_READONLY
 73 #define __P101  PAGE_READONLY
 74 #define __P110  PAGE_COPY
 75 #define __P111  PAGE_COPY
 76 
 77 #define __S000  PAGE_NONE
 78 #define __S001  PAGE_READONLY
 79 #define __S010  PAGE_SHARED
 80 #define __S011  PAGE_SHARED
 81 #define __S100  PAGE_READONLY
 82 #define __S101  PAGE_READONLY
 83 #define __S110  PAGE_SHARED
 84 #define __S111  PAGE_SHARED
 85 
 86 /* First physical page can be anywhere, the following is needed so that
 87  * va-->pa and vice versa conversions work properly without performance
 88  * hit for all __pa()/__va() operations.
 89  */
 90 extern unsigned long phys_base;
 91 extern unsigned long pfn_base;
 92 
 93 /*
 94  * ZERO_PAGE is a global shared page that is always zero: used
 95  * for zero-mapped memory areas etc..
 96  */
 97 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
 98 
 99 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
100 
101 /*
102  * In general all page table modifications should use the V8 atomic
103  * swap instruction.  This insures the mmu and the cpu are in sync
104  * with respect to ref/mod bits in the page tables.
105  */
106 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
107 {
108         __asm__ __volatile__("swap [%2], %0" :
109                         "=&r" (value) : "" (value), "r" (addr) : "memory");
110         return value;
111 }
112 
113 /* Certain architectures need to do special things when pte's
114  * within a page table are directly modified.  Thus, the following
115  * hook is made available.
116  */
117 
118 static inline void set_pte(pte_t *ptep, pte_t pteval)
119 {
120         srmmu_swap((unsigned long *)ptep, pte_val(pteval));
121 }
122 
123 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
124 
125 static inline int srmmu_device_memory(unsigned long x)
126 {
127         return ((x & 0xF0000000) != 0);
128 }
129 
130 static inline struct page *pmd_page(pmd_t pmd)
131 {
132         if (srmmu_device_memory(pmd_val(pmd)))
133                 BUG();
134         return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
135 }
136 
137 static inline unsigned long __pmd_page(pmd_t pmd)
138 {
139         unsigned long v;
140 
141         if (srmmu_device_memory(pmd_val(pmd)))
142                 BUG();
143 
144         v = pmd_val(pmd) & SRMMU_PTD_PMASK;
145         return (unsigned long)__nocache_va(v << 4);
146 }
147 
148 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
149 {
150         unsigned long v = pmd_val(pmd) & SRMMU_PTD_PMASK;
151         return (unsigned long)__nocache_va(v << 4);
152 }
153 
154 static inline pmd_t *pud_pgtable(pud_t pud)
155 {
156         if (srmmu_device_memory(pud_val(pud))) {
157                 return (pmd_t *)~0;
158         } else {
159                 unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK;
160                 return (pmd_t *)__nocache_va(v << 4);
161         }
162 }
163 
164 static inline int pte_present(pte_t pte)
165 {
166         return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
167 }
168 
169 static inline int pte_none(pte_t pte)
170 {
171         return !pte_val(pte);
172 }
173 
174 static inline void __pte_clear(pte_t *ptep)
175 {
176         set_pte(ptep, __pte(0));
177 }
178 
179 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
180 {
181         __pte_clear(ptep);
182 }
183 
184 static inline int pmd_bad(pmd_t pmd)
185 {
186         return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
187 }
188 
189 static inline int pmd_present(pmd_t pmd)
190 {
191         return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
192 }
193 
194 static inline int pmd_none(pmd_t pmd)
195 {
196         return !pmd_val(pmd);
197 }
198 
199 static inline void pmd_clear(pmd_t *pmdp)
200 {
201         set_pte((pte_t *)&pmd_val(*pmdp), __pte(0));
202 }
203 
204 static inline int pud_none(pud_t pud)
205 {
206         return !(pud_val(pud) & 0xFFFFFFF);
207 }
208 
209 static inline int pud_bad(pud_t pud)
210 {
211         return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
212 }
213 
214 static inline int pud_present(pud_t pud)
215 {
216         return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
217 }
218 
219 static inline void pud_clear(pud_t *pudp)
220 {
221         set_pte((pte_t *)pudp, __pte(0));
222 }
223 
224 /*
225  * The following only work if pte_present() is true.
226  * Undefined behaviour if not..
227  */
228 static inline int pte_write(pte_t pte)
229 {
230         return pte_val(pte) & SRMMU_WRITE;
231 }
232 
233 static inline int pte_dirty(pte_t pte)
234 {
235         return pte_val(pte) & SRMMU_DIRTY;
236 }
237 
238 static inline int pte_young(pte_t pte)
239 {
240         return pte_val(pte) & SRMMU_REF;
241 }
242 
243 static inline pte_t pte_wrprotect(pte_t pte)
244 {
245         return __pte(pte_val(pte) & ~SRMMU_WRITE);
246 }
247 
248 static inline pte_t pte_mkclean(pte_t pte)
249 {
250         return __pte(pte_val(pte) & ~SRMMU_DIRTY);
251 }
252 
253 static inline pte_t pte_mkold(pte_t pte)
254 {
255         return __pte(pte_val(pte) & ~SRMMU_REF);
256 }
257 
258 static inline pte_t pte_mkwrite(pte_t pte)
259 {
260         return __pte(pte_val(pte) | SRMMU_WRITE);
261 }
262 
263 static inline pte_t pte_mkdirty(pte_t pte)
264 {
265         return __pte(pte_val(pte) | SRMMU_DIRTY);
266 }
267 
268 static inline pte_t pte_mkyoung(pte_t pte)
269 {
270         return __pte(pte_val(pte) | SRMMU_REF);
271 }
272 
273 #define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
274 
275 static inline unsigned long pte_pfn(pte_t pte)
276 {
277         if (srmmu_device_memory(pte_val(pte))) {
278                 /* Just return something that will cause
279                  * pfn_valid() to return false.  This makes
280                  * copy_one_pte() to just directly copy to
281                  * PTE over.
282                  */
283                 return ~0UL;
284         }
285         return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
286 }
287 
288 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
289 
290 /*
291  * Conversion functions: convert a page and protection to a page entry,
292  * and a page entry and page directory to the page they refer to.
293  */
294 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
295 {
296         return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot));
297 }
298 
299 static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
300 {
301         return __pte(((page) >> 4) | pgprot_val(pgprot));
302 }
303 
304 static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
305 {
306         return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot));
307 }
308 
309 #define pgprot_noncached pgprot_noncached
310 static inline pgprot_t pgprot_noncached(pgprot_t prot)
311 {
312         pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE));
313         return prot;
314 }
315 
316 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
317 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
318 {
319         return __pte((pte_val(pte) & SRMMU_CHG_MASK) |
320                 pgprot_val(newprot));
321 }
322 
323 /* only used by the huge vmap code, should never be called */
324 #define pud_page(pud)                   NULL
325 
326 struct seq_file;
327 void mmu_info(struct seq_file *m);
328 
329 /* Fault handler stuff... */
330 #define FAULT_CODE_PROT     0x1
331 #define FAULT_CODE_WRITE    0x2
332 #define FAULT_CODE_USER     0x4
333 
334 #define update_mmu_cache(vma, address, ptep) do { } while (0)
335 
336 void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
337                       unsigned long xva, unsigned int len);
338 void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len);
339 
340 /* Encode and de-code a swap entry */
341 static inline unsigned long __swp_type(swp_entry_t entry)
342 {
343         return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK;
344 }
345 
346 static inline unsigned long __swp_offset(swp_entry_t entry)
347 {
348         return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK;
349 }
350 
351 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
352 {
353         return (swp_entry_t) {
354                 (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT
355                 | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT };
356 }
357 
358 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
359 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
360 
361 static inline unsigned long
362 __get_phys (unsigned long addr)
363 {
364         switch (sparc_cpu_model){
365         case sun4m:
366         case sun4d:
367                 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
368         default:
369                 return 0;
370         }
371 }
372 
373 static inline int
374 __get_iospace (unsigned long addr)
375 {
376         switch (sparc_cpu_model){
377         case sun4m:
378         case sun4d:
379                 return (srmmu_get_pte (addr) >> 28);
380         default:
381                 return -1;
382         }
383 }
384 
385 extern unsigned long *sparc_valid_addr_bitmap;
386 
387 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
388 #define kern_addr_valid(addr) \
389         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
390 
391 /*
392  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
393  * its high 4 bits.  These macros/functions put it there or get it from there.
394  */
395 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
396 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
397 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
398 
399 int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
400                     unsigned long, pgprot_t);
401 
402 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
403                                      unsigned long from, unsigned long pfn,
404                                      unsigned long size, pgprot_t prot)
405 {
406         unsigned long long offset, space, phys_base;
407 
408         offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
409         space = GET_IOSPACE(pfn);
410         phys_base = offset | (space << 32ULL);
411 
412         return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
413 }
414 #define io_remap_pfn_range io_remap_pfn_range
415 
416 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
417 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
418 ({                                                                        \
419         int __changed = !pte_same(*(__ptep), __entry);                    \
420         if (__changed) {                                                  \
421                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
422                 flush_tlb_page(__vma, __address);                         \
423         }                                                                 \
424         __changed;                                                        \
425 })
426 
427 #endif /* !(__ASSEMBLY__) */
428 
429 #define VMALLOC_START           _AC(0xfe600000,UL)
430 #define VMALLOC_END             _AC(0xffc00000,UL)
431 
432 /* We provide our own get_unmapped_area to cope with VA holes for userland */
433 #define HAVE_ARCH_UNMAPPED_AREA
434 
435 #define pmd_pgtable(pmd)        ((pgtable_t)__pmd_page(pmd))
436 
437 #endif /* !(_SPARC_PGTABLE_H) */
438 

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