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

INCLUDED FROM

DEFINITIONS

1. pud_page_vaddr
2. pmd_offset

   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 
  32 typedef struct { unsigned long long pmd; } pmd_t;
  33 #define pmd_val(x)      ((x).pmd)
  34 #define __pmd(x)        ((pmd_t) { (x) } )
  35 
  36 static inline unsigned long pud_page_vaddr(pud_t pud)
  37 {
  38         return pud_val(pud);
  39 }
  40 
  41 /* only used by the stubbed out hugetlb gup code, should never be called */
  42 #define pud_page(pud)           NULL
  43 
  44 #define pmd_index(address)      (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
  45 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
  46 {
  47         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
  48 }
  49 
  50 #define pud_none(x)     (!pud_val(x))
  51 #define pud_present(x)  (pud_val(x))
  52 #define pud_clear(xp)   do { set_pud(xp, __pud(0)); } while (0)
  53 #define pud_bad(x)      (pud_val(x) & ~PAGE_MASK)
  54 
  55 /*
  56  * (puds are folded into pgds so this doesn't get actually called,
  57  * but the define is needed for a generic inline function.)
  58  */
  59 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
  60 
  61 #endif /* __ASM_SH_PGTABLE_3LEVEL_H */