diff options
Diffstat (limited to 'arch/sh/include/asm/pgtable-3level.h')
| -rw-r--r-- | arch/sh/include/asm/pgtable-3level.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/sh/include/asm/pgtable-3level.h b/arch/sh/include/asm/pgtable-3level.h new file mode 100644 index 0000000000..d1ce73f3bd --- /dev/null +++ b/arch/sh/include/asm/pgtable-3level.h @@ -0,0 +1,59 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_SH_PGTABLE_3LEVEL_H +#define __ASM_SH_PGTABLE_3LEVEL_H + +#include <asm-generic/pgtable-nopud.h> + +/* + * Some cores need a 3-level page table layout, for example when using + * 64-bit PTEs and 4K pages. + */ +#define PAGETABLE_LEVELS 3 + +#define PTE_MAGNITUDE 3 /* 64-bit PTEs on SH-X2 TLB */ + +/* PGD bits */ +#define PGDIR_SHIFT 30 + +#define PTRS_PER_PGD 4 +#define USER_PTRS_PER_PGD 2 + +/* PMD bits */ +#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE)) +#define PMD_SIZE (1UL << PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE-1)) + +#define PTRS_PER_PMD ((1 << PGDIR_SHIFT) / PMD_SIZE) + +#define pmd_ERROR(e) \ + printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e)) + +typedef union { + struct { + unsigned long pmd_low; + unsigned long pmd_high; + }; + unsigned long long pmd; +} pmd_t; +#define pmd_val(x) ((x).pmd) +#define __pmd(x) ((pmd_t) { .pmd = (x) } ) + +static inline pmd_t *pud_pgtable(pud_t pud) +{ + return (pmd_t *)(unsigned long)pud_val(pud); +} + +/* only used by the stubbed out hugetlb gup code, should never be called */ +#define pud_page(pud) NULL +#define pud_none(x) (!pud_val(x)) +#define pud_present(x) (pud_val(x)) +#define pud_clear(xp) do { set_pud(xp, __pud(0)); } while (0) +#define pud_bad(x) (pud_val(x) & ~PAGE_MASK) + +/* + * (puds are folded into pgds so this doesn't get actually called, + * but the define is needed for a generic inline function.) + */ +#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) + +#endif /* __ASM_SH_PGTABLE_3LEVEL_H */ |