arch/sh/include/asm/pgtable-3level.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_PGTABLE_3LEVEL_H
   3 #define __ASM_SH_PGTABLE_3LEVEL_H
   4
   5 #include <asm-generic/pgtable-nopud.h>
   6
   7 /*
   8  * Some cores need a 3-level page table layout, for example when using
   9  * 64-bit PTEs and 4K pages.
  10  */
  11 #define PAGETABLE_LEVELS        3
  12
  13 #define PTE_MAGNITUDE           3       /* 64-bit PTEs on SH-X2 TLB */
  14
  15 /* PGD bits */
  16 #define PGDIR_SHIFT             30
  17
  18 #define PTRS_PER_PGD            4
  19 #define USER_PTRS_PER_PGD       2
  20
  21 /* PMD bits */
  22 #define PMD_SHIFT       (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
  23 #define PMD_SIZE        (1UL << PMD_SHIFT)
  24 #define PMD_MASK        (~(PMD_SIZE-1))
  25
  26 #define PTRS_PER_PMD    ((1 << PGDIR_SHIFT) / PMD_SIZE)
  27
  28 #define pmd_ERROR(e) \
  29         printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
  30
  31 typedef union {
  32         struct {
  33                 unsigned long pmd_low;
  34                 unsigned long pmd_high;
  35         };
  36         unsigned long long pmd;
  37 } pmd_t;
  38 #define pmd_val(x)      ((x).pmd)
  39 #define __pmd(x)        ((pmd_t) { .pmd = (x) } )
  40
  41 static inline pmd_t *pud_pgtable(pud_t pud)
  42 {
  43         return (pmd_t *)(unsigned long)pud_val(pud);
  44 }
  45
  46 /* only used by the stubbed out hugetlb gup code, should never be called */
  47 #define pud_page(pud)           NULL
  48 #define pud_none(x)     (!pud_val(x))
  49 #define pud_present(x)  (pud_val(x))
  50 #define pud_clear(xp)   do { set_pud(xp, __pud(0)); } while (0)
  51 #define pud_bad(x)      (pud_val(x) & ~PAGE_MASK)
  52
  53 /*
  54  * (puds are folded into pgds so this doesn't get actually called,
  55  * but the define is needed for a generic inline function.)
  56  */
  57 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
  58
  59 #endif /* __ASM_SH_PGTABLE_3LEVEL_H */