From da02877987e6e173ebba137d4e1e155e1f1151cd Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Tue, 22 Nov 2011 17:30:29 +0000 Subject: ARM: LPAE: Page table maintenance for the 3-level format This patch modifies the pgd/pmd/pte manipulation functions to support the 3-level page table format. Since there is no need for an 'ext' argument to cpu_set_pte_ext(), this patch conditionally defines a different prototype for this function when CONFIG_ARM_LPAE. The patch also introduces the L_PGD_SWAPPER flag to mark pgd entries pointing to pmd tables pre-allocated in the swapper_pg_dir and avoid trying to free them at run-time. This flag is 0 with the classic page table format. Signed-off-by: Catalin Marinas --- arch/arm/include/asm/pgtable-3level.h | 53 +++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) (limited to 'arch/arm/include/asm/pgtable-3level.h') diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h index 79bf0acc40db..759af70f9a0a 100644 --- a/arch/arm/include/asm/pgtable-3level.h +++ b/arch/arm/include/asm/pgtable-3level.h @@ -99,4 +99,57 @@ #define L_PTE_MT_DEV_CACHED (_AT(pteval_t, 3) << 2) /* normal inner write-back */ #define L_PTE_MT_MASK (_AT(pteval_t, 7) << 2) +/* + * Software PGD flags. + */ +#define L_PGD_SWAPPER (_AT(pgdval_t, 1) << 55) /* swapper_pg_dir entry */ + +#ifndef __ASSEMBLY__ + +#define pud_none(pud) (!pud_val(pud)) +#define pud_bad(pud) (!(pud_val(pud) & 2)) +#define pud_present(pud) (pud_val(pud)) + +#define pud_clear(pudp) \ + do { \ + *pudp = __pud(0); \ + clean_pmd_entry(pudp); \ + } while (0) + +#define set_pud(pudp, pud) \ + do { \ + *pudp = pud; \ + flush_pmd_entry(pudp); \ + } while (0) + +static inline pmd_t *pud_page_vaddr(pud_t pud) +{ + return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); +} + +/* Find an entry in the second-level page table.. */ +#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) +static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) +{ + return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); +} + +#define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) + +#define copy_pmd(pmdpd,pmdps) \ + do { \ + *pmdpd = *pmdps; \ + flush_pmd_entry(pmdpd); \ + } while (0) + +#define pmd_clear(pmdp) \ + do { \ + *pmdp = __pmd(0); \ + clean_pmd_entry(pmdp); \ + } while (0) + +#define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,__pte(pte_val(pte)|(ext))) + +#endif /* __ASSEMBLY__ */ + #endif /* _ASM_PGTABLE_3LEVEL_H */ -- cgit v1.2.3