diff options
Diffstat (limited to 'arch/arc/include/asm/pgtable-levels.h')
| -rw-r--r-- | arch/arc/include/asm/pgtable-levels.h | 63 |
1 files changed, 58 insertions, 5 deletions
diff --git a/arch/arc/include/asm/pgtable-levels.h b/arch/arc/include/asm/pgtable-levels.h index 561dedab79ed..5dd8c58f7d70 100644 --- a/arch/arc/include/asm/pgtable-levels.h +++ b/arch/arc/include/asm/pgtable-levels.h @@ -10,6 +10,8 @@ #ifndef _ASM_ARC_PGTABLE_LEVELS_H #define _ASM_ARC_PGTABLE_LEVELS_H +#if CONFIG_PGTABLE_LEVELS == 2 + /* * 2 level paging setup for software walked MMUv3 (ARC700) and MMUv4 (HS) * @@ -47,16 +49,38 @@ #endif -#define PGDIR_SIZE BIT(PGDIR_SHIFT) /* vaddr span, not PDG sz */ -#define PGDIR_MASK (~(PGDIR_SIZE - 1)) +#else /* CONFIG_PGTABLE_LEVELS != 2 */ + +/* + * A default 3 level paging testing setup in software walked MMU + * MMUv4 (8K page): <4> : <7> : <8> : <13> + */ +#define PGDIR_SHIFT 28 +#if CONFIG_PGTABLE_LEVELS > 2 +#define PMD_SHIFT 21 +#endif +#endif /* CONFIG_PGTABLE_LEVELS */ + +#define PGDIR_SIZE BIT(PGDIR_SHIFT) +#define PGDIR_MASK (~(PGDIR_SIZE - 1)) #define PTRS_PER_PGD BIT(32 - PGDIR_SHIFT) -#define PTRS_PER_PTE BIT(PGDIR_SHIFT - PAGE_SHIFT) +#if CONFIG_PGTABLE_LEVELS > 2 +#define PMD_SIZE BIT(PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE - 1)) +#define PTRS_PER_PMD BIT(PGDIR_SHIFT - PMD_SHIFT) +#endif + +#define PTRS_PER_PTE BIT(PMD_SHIFT - PAGE_SHIFT) #ifndef __ASSEMBLY__ +#if CONFIG_PGTABLE_LEVELS > 2 +#include <asm-generic/pgtable-nopud.h> +#else #include <asm-generic/pgtable-nopmd.h> +#endif /* * 1st level paging: pgd @@ -67,9 +91,35 @@ #define pgd_ERROR(e) \ pr_crit("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) +#if CONFIG_PGTABLE_LEVELS > 2 + +/* In 3 level paging, pud_* macros work on pgd */ +#define pud_none(x) (!pud_val(x)) +#define pud_bad(x) ((pud_val(x) & ~PAGE_MASK)) +#define pud_present(x) (pud_val(x)) +#define pud_clear(xp) do { pud_val(*(xp)) = 0; } while (0) +#define pud_pgtable(pud) ((pmd_t *)(pud_val(pud) & PAGE_MASK)) +#define pud_page(pud) virt_to_page(pud_pgtable(pud)) +#define set_pud(pudp, pud) (*(pudp) = pud) + /* - * Due to the strange way generic pgtable level folding works, in a 2 level - * setup, pmd_val() returns pgd, so these pmd_* macros actually work on pgd + * 2nd level paging: pmd + */ +#define pmd_ERROR(e) \ + pr_crit("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) + +#define pmd_pfn(pmd) ((pmd_val(pmd) & PMD_MASK) >> PAGE_SHIFT) +#define pfn_pmd(pfn,prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) +#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) + +#endif + +/* + * Due to the strange way generic pgtable level folding works, the pmd_* macros + * - are valid even for 2 levels (which supposedly only has pgd - pte) + * - behave differently for 2 vs. 3 + * In 2 level paging (pgd -> pte), pmd_* macros work on pgd + * In 3+ level paging (pgd -> pmd -> pte), pmd_* macros work on pmd */ #define pmd_none(x) (!pmd_val(x)) #define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK)) @@ -80,6 +130,9 @@ #define set_pmd(pmdp, pmd) (*(pmdp) = pmd) #define pmd_pgtable(pmd) ((pgtable_t) pmd_page_vaddr(pmd)) +/* + * 3rd level paging: pte + */ #define pte_ERROR(e) \ pr_crit("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |