LXR linux/arch/m68k/include/asm/mcf

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _MCF_PGTABLE_H
   3#define _MCF_PGTABLE_H
   4
   5#include <asm/mcfmmu.h>
   6#include <asm/page.h>
   7
   8/*
   9 * MMUDR bits, in proper place. We write these directly into the MMUDR
  10 * after masking from the pte.
  11 */
  12#define CF_PAGE_LOCKED          MMUDR_LK        /* 0x00000002 */
  13#define CF_PAGE_EXEC            MMUDR_X         /* 0x00000004 */
  14#define CF_PAGE_WRITABLE        MMUDR_W         /* 0x00000008 */
  15#define CF_PAGE_READABLE        MMUDR_R         /* 0x00000010 */
  16#define CF_PAGE_SYSTEM          MMUDR_SP        /* 0x00000020 */
  17#define CF_PAGE_COPYBACK        MMUDR_CM_CCB    /* 0x00000040 */
  18#define CF_PAGE_NOCACHE         MMUDR_CM_NCP    /* 0x00000080 */
  19
  20#define CF_CACHEMASK            (~MMUDR_CM_CCB)
  21#define CF_PAGE_MMUDR_MASK      0x000000fe
  22
  23#define _PAGE_NOCACHE030        CF_PAGE_NOCACHE
  24
  25/*
  26 * MMUTR bits, need shifting down.
  27 */
  28#define CF_PAGE_MMUTR_MASK      0x00000c00
  29#define CF_PAGE_MMUTR_SHIFT     10
  30
  31#define CF_PAGE_VALID           (MMUTR_V << CF_PAGE_MMUTR_SHIFT)
  32#define CF_PAGE_SHARED          (MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
  33
  34/*
  35 * Fake bits, not implemented in CF, will get masked out before
  36 * hitting hardware.
  37 */
  38#define CF_PAGE_DIRTY           0x00000001
  39#define CF_PAGE_ACCESSED        0x00001000
  40
  41#define _PAGE_CACHE040          0x020   /* 68040 cache mode, cachable, copyback */
  42#define _PAGE_NOCACHE_S         0x040   /* 68040 no-cache mode, serialized */
  43#define _PAGE_NOCACHE           0x060   /* 68040 cache mode, non-serialized */
  44#define _PAGE_CACHE040W         0x000   /* 68040 cache mode, cachable, write-through */
  45#define _DESCTYPE_MASK          0x003
  46#define _CACHEMASK040           (~0x060)
  47#define _PAGE_GLOBAL040         0x400   /* 68040 global bit, used for kva descs */
  48
  49/*
  50 * Externally used page protection values.
  51 */
  52#define _PAGE_PRESENT   (CF_PAGE_VALID)
  53#define _PAGE_ACCESSED  (CF_PAGE_ACCESSED)
  54#define _PAGE_DIRTY     (CF_PAGE_DIRTY)
  55#define _PAGE_READWRITE (CF_PAGE_READABLE \
  56                                | CF_PAGE_WRITABLE \
  57                                | CF_PAGE_SYSTEM \
  58                                | CF_PAGE_SHARED)
  59
  60/*
  61 * Compound page protection values.
  62 */
  63#define PAGE_NONE       __pgprot(CF_PAGE_VALID \
  64                                 | CF_PAGE_ACCESSED)
  65
  66#define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
  67                                 | CF_PAGE_ACCESSED \
  68                                 | CF_PAGE_SHARED)
  69
  70#define PAGE_INIT       __pgprot(CF_PAGE_VALID \
  71                                 | CF_PAGE_READABLE \
  72                                 | CF_PAGE_WRITABLE \
  73                                 | CF_PAGE_EXEC \
  74                                 | CF_PAGE_SYSTEM)
  75
  76#define PAGE_KERNEL     __pgprot(CF_PAGE_VALID \
  77                                 | CF_PAGE_ACCESSED \
  78                                 | CF_PAGE_READABLE \
  79                                 | CF_PAGE_WRITABLE \
  80                                 | CF_PAGE_EXEC \
  81                                 | CF_PAGE_SYSTEM \
  82                                 | CF_PAGE_SHARED)
  83
  84#define PAGE_COPY       __pgprot(CF_PAGE_VALID \
  85                                 | CF_PAGE_ACCESSED \
  86                                 | CF_PAGE_READABLE \
  87                                 | CF_PAGE_DIRTY)
  88
  89/*
  90 * Page protections for initialising protection_map. See mm/mmap.c
  91 * for use. In general, the bit positions are xwr, and P-items are
  92 * private, the S-items are shared.
  93 */
  94#define __P000          PAGE_NONE
  95#define __P001          __pgprot(CF_PAGE_VALID \
  96                                 | CF_PAGE_ACCESSED \
  97                                 | CF_PAGE_READABLE)
  98#define __P010          __pgprot(CF_PAGE_VALID \
  99                                 | CF_PAGE_ACCESSED \
 100                                 | CF_PAGE_WRITABLE)
 101#define __P011          __pgprot(CF_PAGE_VALID \
 102                                 | CF_PAGE_ACCESSED \
 103                                 | CF_PAGE_READABLE \
 104                                 | CF_PAGE_WRITABLE)
 105#define __P100          __pgprot(CF_PAGE_VALID \
 106                                 | CF_PAGE_ACCESSED \
 107                                 | CF_PAGE_EXEC)
 108#define __P101          __pgprot(CF_PAGE_VALID \
 109                                 | CF_PAGE_ACCESSED \
 110                                 | CF_PAGE_READABLE \
 111                                 | CF_PAGE_EXEC)
 112#define __P110          __pgprot(CF_PAGE_VALID \
 113                                 | CF_PAGE_ACCESSED \
 114                                 | CF_PAGE_WRITABLE \
 115                                 | CF_PAGE_EXEC)
 116#define __P111          __pgprot(CF_PAGE_VALID \
 117                                 | CF_PAGE_ACCESSED \
 118                                 | CF_PAGE_READABLE \
 119                                 | CF_PAGE_WRITABLE \
 120                                 | CF_PAGE_EXEC)
 121
 122#define __S000          PAGE_NONE
 123#define __S001          __pgprot(CF_PAGE_VALID \
 124                                 | CF_PAGE_ACCESSED \
 125                                 | CF_PAGE_READABLE)
 126#define __S010          PAGE_SHARED
 127#define __S011          __pgprot(CF_PAGE_VALID \
 128                                 | CF_PAGE_ACCESSED \
 129                                 | CF_PAGE_SHARED \
 130                                 | CF_PAGE_READABLE)
 131#define __S100          __pgprot(CF_PAGE_VALID \
 132                                 | CF_PAGE_ACCESSED \
 133                                 | CF_PAGE_EXEC)
 134#define __S101          __pgprot(CF_PAGE_VALID \
 135                                 | CF_PAGE_ACCESSED \
 136                                 | CF_PAGE_READABLE \
 137                                 | CF_PAGE_EXEC)
 138#define __S110          __pgprot(CF_PAGE_VALID \
 139                                 | CF_PAGE_ACCESSED \
 140                                 | CF_PAGE_SHARED \
 141                                 | CF_PAGE_EXEC)
 142#define __S111          __pgprot(CF_PAGE_VALID \
 143                                 | CF_PAGE_ACCESSED \
 144                                 | CF_PAGE_SHARED \
 145                                 | CF_PAGE_READABLE \
 146                                 | CF_PAGE_EXEC)
 147
 148#define PTE_MASK        PAGE_MASK
 149#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
 150
 151#ifndef __ASSEMBLY__
 152
 153#define pmd_pgtable(pmd) pfn_to_virt(pmd_val(pmd) >> PAGE_SHIFT)
 154
 155/*
 156 * Conversion functions: convert a page and protection to a page entry,
 157 * and a page entry and page directory to the page they refer to.
 158 */
 159#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
 160
 161static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 162{
 163        pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
 164        return pte;
 165}
 166
 167#define pmd_set(pmdp, ptep) do {} while (0)
 168
 169static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
 170{
 171        pgd_val(*pgdp) = virt_to_phys(pmdp);
 172}
 173
 174#define __pte_page(pte) ((unsigned long) (pte_val(pte) & PAGE_MASK))
 175#define pmd_page_vaddr(pmd)     ((unsigned long) (pmd_val(pmd)))
 176
 177static inline int pte_none(pte_t pte)
 178{
 179        return !pte_val(pte);
 180}
 181
 182static inline int pte_present(pte_t pte)
 183{
 184        return pte_val(pte) & CF_PAGE_VALID;
 185}
 186
 187static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 188        pte_t *ptep)
 189{
 190        pte_val(*ptep) = 0;
 191}
 192
 193#define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
 194#define pte_page(pte)   virt_to_page(__pte_page(pte))
 195
 196static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
 197#define pmd_none(pmd) pmd_none2(&(pmd))
 198static inline int pmd_bad2(pmd_t *pmd) { return 0; }
 199#define pmd_bad(pmd) pmd_bad2(&(pmd))
 200#define pmd_present(pmd) (!pmd_none2(&(pmd)))
 201static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
 202
 203#define pte_ERROR(e) \
 204        printk(KERN_ERR "%s:%d: bad pte %08lx.\n",      \
 205        __FILE__, __LINE__, pte_val(e))
 206#define pgd_ERROR(e) \
 207        printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",      \
 208        __FILE__, __LINE__, pgd_val(e))
 209
 210/*
 211 * The following only work if pte_present() is true.
 212 * Undefined behaviour if not...
 213 * [we have the full set here even if they don't change from m68k]
 214 */
 215static inline int pte_read(pte_t pte)
 216{
 217        return pte_val(pte) & CF_PAGE_READABLE;
 218}
 219
 220static inline int pte_write(pte_t pte)
 221{
 222        return pte_val(pte) & CF_PAGE_WRITABLE;
 223}
 224
 225static inline int pte_exec(pte_t pte)
 226{
 227        return pte_val(pte) & CF_PAGE_EXEC;
 228}
 229
 230static inline int pte_dirty(pte_t pte)
 231{
 232        return pte_val(pte) & CF_PAGE_DIRTY;
 233}
 234
 235static inline int pte_young(pte_t pte)
 236{
 237        return pte_val(pte) & CF_PAGE_ACCESSED;
 238}
 239
 240static inline pte_t pte_wrprotect(pte_t pte)
 241{
 242        pte_val(pte) &= ~CF_PAGE_WRITABLE;
 243        return pte;
 244}
 245
 246static inline pte_t pte_rdprotect(pte_t pte)
 247{
 248        pte_val(pte) &= ~CF_PAGE_READABLE;
 249        return pte;
 250}
 251
 252static inline pte_t pte_exprotect(pte_t pte)
 253{
 254        pte_val(pte) &= ~CF_PAGE_EXEC;
 255        return pte;
 256}
 257
 258static inline pte_t pte_mkclean(pte_t pte)
 259{
 260        pte_val(pte) &= ~CF_PAGE_DIRTY;
 261        return pte;
 262}
 263
 264static inline pte_t pte_mkold(pte_t pte)
 265{
 266        pte_val(pte) &= ~CF_PAGE_ACCESSED;
 267        return pte;
 268}
 269
 270static inline pte_t pte_mkwrite(pte_t pte)
 271{
 272        pte_val(pte) |= CF_PAGE_WRITABLE;
 273        return pte;
 274}
 275
 276static inline pte_t pte_mkread(pte_t pte)
 277{
 278        pte_val(pte) |= CF_PAGE_READABLE;
 279        return pte;
 280}
 281
 282static inline pte_t pte_mkexec(pte_t pte)
 283{
 284        pte_val(pte) |= CF_PAGE_EXEC;
 285        return pte;
 286}
 287
 288static inline pte_t pte_mkdirty(pte_t pte)
 289{
 290        pte_val(pte) |= CF_PAGE_DIRTY;
 291        return pte;
 292}
 293
 294static inline pte_t pte_mkyoung(pte_t pte)
 295{
 296        pte_val(pte) |= CF_PAGE_ACCESSED;
 297        return pte;
 298}
 299
 300static inline pte_t pte_mknocache(pte_t pte)
 301{
 302        pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
 303        return pte;
 304}
 305
 306static inline pte_t pte_mkcache(pte_t pte)
 307{
 308        pte_val(pte) &= ~CF_PAGE_NOCACHE;
 309        return pte;
 310}
 311
 312#define swapper_pg_dir kernel_pg_dir
 313extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 314
 315/*
 316 * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
 317 */
 318#define __swp_type(x)           ((x).val & 0xFF)
 319#define __swp_offset(x)         ((x).val >> 11)
 320#define __swp_entry(typ, off)   ((swp_entry_t) { (typ) | \
 321                                        (off << 11) })
 322#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 323#define __swp_entry_to_pte(x)   (__pte((x).val))
 324
 325#define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 326
 327#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 328#define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
 329
 330#endif  /* !__ASSEMBLY__ */
 331#endif  /* _MCF_PGTABLE_H */
 332