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 typedef union { 29 struct { 30 unsigned long pmd_low; 31 unsigned long pmd_high; 32 }; 33 unsigned long long pmd; 34 } pmd_t; 35 #define pmd_val(x) ((x).pmd) 36 #define __pmd(x) ((pmd_t) { .pmd = (x) } ) 37 38 static inline pmd_t *pud_pgtable(pud_t pud) 39 { 40 return (pmd_t *)(unsigned long)pud_val(pud); 41 } 42 43 /* only used by the stubbed out hugetlb gup code, should never be called */ 44 #define pud_page(pud) NULL 45 #define pud_none(x) (!pud_val(x)) 46 #define pud_present(x) (pud_val(x)) 47 #define pud_clear(xp) do { set_pud(xp, __pud(0)); } while (0) 48 #define pud_bad(x) (pud_val(x) & ~PAGE_MASK) 49 50 /* 51 * (puds are folded into pgds so this doesn't get actually called, 52 * but the define is needed for a generic inline function.) 53 */ 54 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) 55 56 #endif /* __ASM_SH_PGTABLE_3LEVEL_H */ 57