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Linux/arch/m68k/include/asm/motorola_pgtable.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _MOTOROLA_PGTABLE_H
  3 #define _MOTOROLA_PGTABLE_H
  4 
  5 
  6 /*
  7  * Definitions for MMU descriptors
  8  */
  9 #define _PAGE_PRESENT   0x001
 10 #define _PAGE_SHORT     0x002
 11 #define _PAGE_RONLY     0x004
 12 #define _PAGE_READWRITE 0x000
 13 #define _PAGE_ACCESSED  0x008
 14 #define _PAGE_DIRTY     0x010
 15 #define _PAGE_SUPER     0x080   /* 68040 supervisor only */
 16 #define _PAGE_GLOBAL040 0x400   /* 68040 global bit, used for kva descs */
 17 #define _PAGE_NOCACHE030 0x040  /* 68030 no-cache mode */
 18 #define _PAGE_NOCACHE   0x060   /* 68040 cache mode, non-serialized */
 19 #define _PAGE_NOCACHE_S 0x040   /* 68040 no-cache mode, serialized */
 20 #define _PAGE_CACHE040  0x020   /* 68040 cache mode, cachable, copyback */
 21 #define _PAGE_CACHE040W 0x000   /* 68040 cache mode, cachable, write-through */
 22 
 23 #define _DESCTYPE_MASK  0x003
 24 
 25 #define _CACHEMASK040   (~0x060)
 26 #define _TABLE_MASK     (0xfffffe00)
 27 
 28 #define _PAGE_TABLE     (_PAGE_SHORT)
 29 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)
 30 
 31 #define _PAGE_PROTNONE  0x004
 32 
 33 #ifndef __ASSEMBLY__
 34 
 35 /* This is the cache mode to be used for pages containing page descriptors for
 36  * processors >= '040. It is in pte_mknocache(), and the variable is defined
 37  * and initialized in head.S */
 38 extern int m68k_pgtable_cachemode;
 39 
 40 /* This is the cache mode for normal pages, for supervisor access on
 41  * processors >= '040. It is used in pte_mkcache(), and the variable is
 42  * defined and initialized in head.S */
 43 
 44 #if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
 45 #define m68k_supervisor_cachemode _PAGE_CACHE040W
 46 #elif defined(CPU_M68040_OR_M68060_ONLY)
 47 #define m68k_supervisor_cachemode _PAGE_CACHE040
 48 #elif defined(CPU_M68020_OR_M68030_ONLY)
 49 #define m68k_supervisor_cachemode 0
 50 #else
 51 extern int m68k_supervisor_cachemode;
 52 #endif
 53 
 54 #if defined(CPU_M68040_OR_M68060_ONLY)
 55 #define mm_cachebits _PAGE_CACHE040
 56 #elif defined(CPU_M68020_OR_M68030_ONLY)
 57 #define mm_cachebits 0
 58 #else
 59 extern unsigned long mm_cachebits;
 60 #endif
 61 
 62 #define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
 63 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
 64 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
 65 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
 66 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
 67 
 68 /* Alternate definitions that are compile time constants, for
 69    initializing protection_map.  The cachebits are fixed later.  */
 70 #define PAGE_NONE_C     __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
 71 #define PAGE_SHARED_C   __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
 72 #define PAGE_COPY_C     __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
 73 #define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
 74 
 75 /*
 76  * The m68k can't do page protection for execute, and considers that the same are read.
 77  * Also, write permissions imply read permissions. This is the closest we can get..
 78  */
 79 #define __P000  PAGE_NONE_C
 80 #define __P001  PAGE_READONLY_C
 81 #define __P010  PAGE_COPY_C
 82 #define __P011  PAGE_COPY_C
 83 #define __P100  PAGE_READONLY_C
 84 #define __P101  PAGE_READONLY_C
 85 #define __P110  PAGE_COPY_C
 86 #define __P111  PAGE_COPY_C
 87 
 88 #define __S000  PAGE_NONE_C
 89 #define __S001  PAGE_READONLY_C
 90 #define __S010  PAGE_SHARED_C
 91 #define __S011  PAGE_SHARED_C
 92 #define __S100  PAGE_READONLY_C
 93 #define __S101  PAGE_READONLY_C
 94 #define __S110  PAGE_SHARED_C
 95 #define __S111  PAGE_SHARED_C
 96 
 97 /*
 98  * Conversion functions: convert a page and protection to a page entry,
 99  * and a page entry and page directory to the page they refer to.
100  */
101 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
102 
103 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
104 {
105         pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
106         return pte;
107 }
108 
109 static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
110 {
111         unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
112         unsigned long *ptr = pmdp->pmd;
113         short i = 16;
114         while (--i >= 0) {
115                 *ptr++ = ptbl;
116                 ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
117         }
118 }
119 
120 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
121 {
122         pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
123 }
124 
125 #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
126 #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
127 #define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
128 
129 
130 #define pte_none(pte)           (!pte_val(pte))
131 #define pte_present(pte)        (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
132 #define pte_clear(mm,addr,ptep)         ({ pte_val(*(ptep)) = 0; })
133 
134 #define pte_page(pte)           virt_to_page(__va(pte_val(pte)))
135 #define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
136 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
137 
138 #define pmd_none(pmd)           (!pmd_val(pmd))
139 #define pmd_bad(pmd)            ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
140 #define pmd_present(pmd)        (pmd_val(pmd) & _PAGE_TABLE)
141 #define pmd_clear(pmdp) ({                      \
142         unsigned long *__ptr = pmdp->pmd;       \
143         short __i = 16;                         \
144         while (--__i >= 0)                      \
145                 *__ptr++ = 0;                   \
146 })
147 #define pmd_page(pmd)           virt_to_page(__va(pmd_val(pmd)))
148 
149 
150 #define pgd_none(pgd)           (!pgd_val(pgd))
151 #define pgd_bad(pgd)            ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
152 #define pgd_present(pgd)        (pgd_val(pgd) & _PAGE_TABLE)
153 #define pgd_clear(pgdp)         ({ pgd_val(*pgdp) = 0; })
154 #define pgd_page(pgd)           (mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
155 
156 #define pte_ERROR(e) \
157         printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
158 #define pmd_ERROR(e) \
159         printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
160 #define pgd_ERROR(e) \
161         printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
162 
163 
164 /*
165  * The following only work if pte_present() is true.
166  * Undefined behaviour if not..
167  */
168 static inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_RONLY); }
169 static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
170 static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
171 static inline int pte_special(pte_t pte)        { return 0; }
172 
173 static inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_RONLY; return pte; }
174 static inline pte_t pte_mkclean(pte_t pte)      { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
175 static inline pte_t pte_mkold(pte_t pte)        { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
176 static inline pte_t pte_mkwrite(pte_t pte)      { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
177 static inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) |= _PAGE_DIRTY; return pte; }
178 static inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
179 static inline pte_t pte_mknocache(pte_t pte)
180 {
181         pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
182         return pte;
183 }
184 static inline pte_t pte_mkcache(pte_t pte)
185 {
186         pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
187         return pte;
188 }
189 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
190 
191 #define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
192 
193 #define pgd_index(address)     ((address) >> PGDIR_SHIFT)
194 
195 /* to find an entry in a page-table-directory */
196 static inline pgd_t *pgd_offset(const struct mm_struct *mm,
197                                 unsigned long address)
198 {
199         return mm->pgd + pgd_index(address);
200 }
201 
202 #define swapper_pg_dir kernel_pg_dir
203 extern pgd_t kernel_pg_dir[128];
204 
205 static inline pgd_t *pgd_offset_k(unsigned long address)
206 {
207         return kernel_pg_dir + (address >> PGDIR_SHIFT);
208 }
209 
210 
211 /* Find an entry in the second-level page table.. */
212 static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
213 {
214         return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
215 }
216 
217 /* Find an entry in the third-level page table.. */
218 static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address)
219 {
220         return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
221 }
222 
223 #define pte_offset_map(pmdp,address) ((pte_t *)__pmd_page(*pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
224 #define pte_unmap(pte)          ((void)0)
225 
226 /*
227  * Allocate and free page tables. The xxx_kernel() versions are
228  * used to allocate a kernel page table - this turns on ASN bits
229  * if any.
230  */
231 
232 /* Prior to calling these routines, the page should have been flushed
233  * from both the cache and ATC, or the CPU might not notice that the
234  * cache setting for the page has been changed. -jskov
235  */
236 static inline void nocache_page(void *vaddr)
237 {
238         unsigned long addr = (unsigned long)vaddr;
239 
240         if (CPU_IS_040_OR_060) {
241                 pgd_t *dir;
242                 pmd_t *pmdp;
243                 pte_t *ptep;
244 
245                 dir = pgd_offset_k(addr);
246                 pmdp = pmd_offset(dir, addr);
247                 ptep = pte_offset_kernel(pmdp, addr);
248                 *ptep = pte_mknocache(*ptep);
249         }
250 }
251 
252 static inline void cache_page(void *vaddr)
253 {
254         unsigned long addr = (unsigned long)vaddr;
255 
256         if (CPU_IS_040_OR_060) {
257                 pgd_t *dir;
258                 pmd_t *pmdp;
259                 pte_t *ptep;
260 
261                 dir = pgd_offset_k(addr);
262                 pmdp = pmd_offset(dir, addr);
263                 ptep = pte_offset_kernel(pmdp, addr);
264                 *ptep = pte_mkcache(*ptep);
265         }
266 }
267 
268 /* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
269 #define __swp_type(x)           (((x).val >> 4) & 0xff)
270 #define __swp_offset(x)         ((x).val >> 12)
271 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
272 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
273 #define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
274 
275 #endif  /* !__ASSEMBLY__ */
276 #endif /* _MOTOROLA_PGTABLE_H */
277 

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