diff options
Diffstat (limited to 'arch/arm/include/asm/pgtable-2level.h')
| -rw-r--r-- | arch/arm/include/asm/pgtable-2level.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h index f97ee02386ee..e3b5ec2d2398 100644 --- a/arch/arm/include/asm/pgtable-2level.h +++ b/arch/arm/include/asm/pgtable-2level.h @@ -179,8 +179,159 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) /* we don't need complex calculations here as the pmd is folded into the pgd */ #define pmd_addr_end(addr,end) (end) +#define pmd_present(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) != PMD_TYPE_FAULT) + #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext) + +#ifdef CONFIG_SYS_SUPPORTS_HUGETLBFS + +/* + * now follows some of the definitions to allow huge page support, we can't put + * these in the hugetlb source files as they are also required for transparent + * hugepage support. + */ + +#define HPAGE_SHIFT PMD_SHIFT +#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) +#define HPAGE_MASK (~(HPAGE_SIZE - 1)) +#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) + +#define HUGE_LINUX_PTE_COUNT (PAGE_OFFSET >> HPAGE_SHIFT) +#define HUGE_LINUX_PTE_SIZE (HUGE_LINUX_PTE_COUNT * sizeof(pte_t *)) +#define HUGE_LINUX_PTE_INDEX(addr) (addr >> HPAGE_SHIFT) + +/* + * We re-purpose the following domain bits in the section descriptor + */ +#define PMD_DOMAIN_MASK (_AT(pmdval_t, 0xF) << 5) +#define PMD_DSECT_DIRTY (_AT(pmdval_t, 1) << 5) +#define PMD_DSECT_AF (_AT(pmdval_t, 1) << 6) +#define PMD_DSECT_SPLITTING (_AT(pmdval_t, 1) << 7) + +#define PMD_BIT_FUNC(fn,op) \ +static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; } + +static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, + pmd_t *pmdp, pmd_t pmd) +{ + /* + * we can sometimes be passed a pmd pointing to a level 2 descriptor + * from collapse_huge_page. + */ + if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE) { + pmdp[0] = __pmd(pmd_val(pmd)); + pmdp[1] = __pmd(pmd_val(pmd) + 256 * sizeof(pte_t)); + } else { + pmdp[0] = __pmd(pmd_val(pmd)); /* first 1M section */ + pmdp[1] = __pmd(pmd_val(pmd) + SECTION_SIZE); /* second 1M section */ + } + + flush_pmd_entry(pmdp); +} + +extern pmdval_t arm_hugepmdprotval; +extern pteval_t arm_hugepteprotval; + +#define pmd_mkhuge(pmd) (__pmd((pmd_val(pmd) & ~PMD_TYPE_MASK) | PMD_TYPE_SECT)) + +PMD_BIT_FUNC(mkold, &= ~PMD_DSECT_AF); +PMD_BIT_FUNC(mkdirty, |= PMD_DSECT_DIRTY); +PMD_BIT_FUNC(mkclean, &= ~PMD_DSECT_DIRTY); +PMD_BIT_FUNC(mkyoung, |= PMD_DSECT_AF); +PMD_BIT_FUNC(mkwrite, |= PMD_SECT_AP_WRITE); +PMD_BIT_FUNC(wrprotect, &= ~PMD_SECT_AP_WRITE); +PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK); +PMD_BIT_FUNC(mkexec, &= ~PMD_SECT_XN); +PMD_BIT_FUNC(mknexec, |= PMD_SECT_XN); + +#define pmd_young(pmd) (pmd_val(pmd) & PMD_DSECT_AF) +#define pmd_write(pmd) (pmd_val(pmd) & PMD_SECT_AP_WRITE) +#define pmd_exec(pmd) (!(pmd_val(pmd) & PMD_SECT_XN)) +#define pmd_dirty(pmd) (pmd_val(pmd) & PMD_DSECT_DIRTY) + +#define __HAVE_ARCH_PMD_WRITE + +#define pmd_modify(pmd, prot) \ +({ \ + pmd_t pmdret = __pmd((pmd_val(pmd) & (PMD_MASK | PMD_DOMAIN_MASK)) \ + | arm_hugepmdprotval); \ + pgprot_t inprot = prot; \ + pte_t newprot = __pte(pgprot_val(inprot)); \ + \ + if (pte_dirty(newprot)) \ + pmdret = pmd_mkdirty(pmdret); \ + else \ + pmdret = pmd_mkclean(pmdret); \ + \ + if (pte_exec(newprot)) \ + pmdret = pmd_mkexec(pmdret); \ + else \ + pmdret = pmd_mknexec(pmdret); \ + \ + if (pte_write(newprot)) \ + pmdret = pmd_mkwrite(pmdret); \ + else \ + pmdret = pmd_wrprotect(pmdret); \ + \ + if (pte_young(newprot)) \ + pmdret = pmd_mkyoung(pmdret); \ + else \ + pmdret = pmd_mkold(pmdret); \ + \ + pmdret; \ +}) + +#else +#define HPAGE_SIZE 0 +#endif /* CONFIG_SYS_SUPPORTS_HUGETLBFS */ + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#define pmd_mkhuge(pmd) (__pmd((pmd_val(pmd) & ~PMD_TYPE_MASK) | PMD_TYPE_SECT)) + +PMD_BIT_FUNC(mksplitting, |= PMD_DSECT_SPLITTING); +#define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_DSECT_SPLITTING) +#define pmd_trans_huge(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_SECT) + +static inline unsigned long pmd_pfn(pmd_t pmd) +{ + /* + * for a section, we need to mask off more of the pmd + * before looking up the pfn + */ + if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_SECT) + return __phys_to_pfn(pmd_val(pmd) & HPAGE_MASK); + else + return __phys_to_pfn(pmd_val(pmd) & PHYS_MASK); +} + +#define pfn_pmd(pfn,prot) pmd_modify(__pmd(__pfn_to_phys(pfn)),prot); +#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot); + +static inline int has_transparent_hugepage(void) +{ + return 1; +} + +#define _PMD_HUGE(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_SECT) +#define _PMD_HPAGE(pmd) (phys_to_page(pmd_val(pmd) & HPAGE_MASK)) +#else +#define _PMD_HUGE(pmd) (0) +#define _PMD_HPAGE(pmd) (0) +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + +static inline struct page *pmd_page(pmd_t pmd) +{ + /* + * for a section, we need to mask off more of the pmd + * before looking up the page as it is a section descriptor. + */ + if (_PMD_HUGE(pmd)) + return _PMD_HPAGE(pmd); + + return phys_to_page(pmd_val(pmd) & PHYS_MASK); +} + #endif /* __ASSEMBLY__ */ #endif /* _ASM_PGTABLE_2LEVEL_H */ |