LXR linux/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#define __ARCH_USE_5LEVEL_HACK
   6#include <asm-generic/pgtable-nopud.h>
   7
   8/*
   9 * Some cores need a 3-level page table layout, for example when using
  10 * 64-bit PTEs and 4K pages.
  11 */
  12#define PAGETABLE_LEVELS        3
  13
  14#define PTE_MAGNITUDE           3       /* 64-bit PTEs on SH-X2 TLB */
  15
  16/* PGD bits */
  17#define PGDIR_SHIFT             30
  18
  19#define PTRS_PER_PGD            4
  20#define USER_PTRS_PER_PGD       2
  21
  22/* PMD bits */
  23#define PMD_SHIFT       (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE))
  24#define PMD_SIZE        (1UL << PMD_SHIFT)
  25#define PMD_MASK        (~(PMD_SIZE-1))
  26
  27#define PTRS_PER_PMD    ((1 << PGDIR_SHIFT) / PMD_SIZE)
  28
  29#define pmd_ERROR(e) \
  30        printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
  31
  32typedef struct { unsigned long long pmd; } pmd_t;
  33#define pmd_val(x)      ((x).pmd)
  34#define __pmd(x)        ((pmd_t) { (x) } )
  35
  36static inline unsigned long pud_page_vaddr(pud_t pud)
  37{
  38        return pud_val(pud);
  39}
  40
  41#define pmd_index(address)      (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
  42static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
  43{
  44        return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
  45}
  46
  47#define pud_none(x)     (!pud_val(x))
  48#define pud_present(x)  (pud_val(x))
  49#define pud_clear(xp)   do { set_pud(xp, __pud(0)); } while (0)
  50#define pud_bad(x)      (pud_val(x) & ~PAGE_MASK)
  51
  52/*
  53 * (puds are folded into pgds so this doesn't get actually called,
  54 * but the define is needed for a generic inline function.)
  55 */
  56#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
  57
  58#endif /* __ASM_SH_PGTABLE_3LEVEL_H */
  59