diff options
Diffstat (limited to 'arch/arm/include/asm/pgtable.h')
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 315 |
1 files changed, 155 insertions, 160 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 53d1d5d..ebcb643 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -10,6 +10,7 @@ #ifndef _ASMARM_PGTABLE_H #define _ASMARM_PGTABLE_H +#include <linux/const.h> #include <asm-generic/4level-fixup.h> #include <asm/proc-fns.h> @@ -54,7 +55,7 @@ * Therefore, we tweak the implementation slightly - we tell Linux that we * have 2048 entries in the first level, each of which is 8 bytes (iow, two * hardware pointers to the second level.) The second level contains two - * hardware PTE tables arranged contiguously, followed by Linux versions + * hardware PTE tables arranged contiguously, preceded by Linux versions * which contain the state information Linux needs. We, therefore, end up * with 512 entries in the "PTE" level. * @@ -62,15 +63,15 @@ * * pgd pte * | | - * +--------+ +0 - * | |-----> +------------+ +0 + * +--------+ + * | | +------------+ +0 + * +- - - - + | Linux pt 0 | + * | | +------------+ +1024 + * +--------+ +0 | Linux pt 1 | + * | |-----> +------------+ +2048 * +- - - - + +4 | h/w pt 0 | - * | |-----> +------------+ +1024 + * | |-----> +------------+ +3072 * +--------+ +8 | h/w pt 1 | - * | | +------------+ +2048 - * +- - - - + | Linux pt 0 | - * | | +------------+ +3072 - * +--------+ | Linux pt 1 | * | | +------------+ +4096 * * See L_PTE_xxx below for definitions of bits in the "Linux pt", and @@ -102,6 +103,10 @@ #define PTRS_PER_PMD 1 #define PTRS_PER_PGD 2048 +#define PTE_HWTABLE_PTRS (PTRS_PER_PTE) +#define PTE_HWTABLE_OFF (PTE_HWTABLE_PTRS * sizeof(pte_t)) +#define PTE_HWTABLE_SIZE (PTRS_PER_PTE * sizeof(u32)) + /* * PMD_SHIFT determines the size of the area a second-level page table can map * PGDIR_SHIFT determines what a third-level page table entry can map @@ -112,13 +117,13 @@ #define LIBRARY_TEXT_START 0x0c000000 #ifndef __ASSEMBLY__ -extern void __pte_error(const char *file, int line, unsigned long val); -extern void __pmd_error(const char *file, int line, unsigned long val); -extern void __pgd_error(const char *file, int line, unsigned long val); +extern void __pte_error(const char *file, int line, pte_t); +extern void __pmd_error(const char *file, int line, pmd_t); +extern void __pgd_error(const char *file, int line, pgd_t); -#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) -#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) -#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) +#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte) +#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd) +#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd) #endif /* !__ASSEMBLY__ */ #define PMD_SIZE (1UL << PMD_SHIFT) @@ -133,8 +138,7 @@ extern void __pgd_error(const char *file, int line, unsigned long val); */ #define FIRST_USER_ADDRESS PAGE_SIZE -#define FIRST_USER_PGD_NR 1 -#define USER_PTRS_PER_PGD ((TASK_SIZE/PGDIR_SIZE) - FIRST_USER_PGD_NR) +#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) /* * section address mask and size definitions. @@ -161,30 +165,30 @@ extern void __pgd_error(const char *file, int line, unsigned long val); * The PTE table pointer refers to the hardware entries; the "Linux" * entries are stored 1024 bytes below. */ -#define L_PTE_PRESENT (1 << 0) -#define L_PTE_YOUNG (1 << 1) -#define L_PTE_FILE (1 << 2) /* only when !PRESENT */ -#define L_PTE_DIRTY (1 << 6) -#define L_PTE_WRITE (1 << 7) -#define L_PTE_USER (1 << 8) -#define L_PTE_EXEC (1 << 9) -#define L_PTE_SHARED (1 << 10) /* shared(v6), coherent(xsc3) */ +#define L_PTE_PRESENT (_AT(pteval_t, 1) << 0) +#define L_PTE_YOUNG (_AT(pteval_t, 1) << 1) +#define L_PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !PRESENT */ +#define L_PTE_DIRTY (_AT(pteval_t, 1) << 6) +#define L_PTE_RDONLY (_AT(pteval_t, 1) << 7) +#define L_PTE_USER (_AT(pteval_t, 1) << 8) +#define L_PTE_XN (_AT(pteval_t, 1) << 9) +#define L_PTE_SHARED (_AT(pteval_t, 1) << 10) /* shared(v6), coherent(xsc3) */ /* * These are the memory types, defined to be compatible with * pre-ARMv6 CPUs cacheable and bufferable bits: XXCB */ -#define L_PTE_MT_UNCACHED (0x00 << 2) /* 0000 */ -#define L_PTE_MT_BUFFERABLE (0x01 << 2) /* 0001 */ -#define L_PTE_MT_WRITETHROUGH (0x02 << 2) /* 0010 */ -#define L_PTE_MT_WRITEBACK (0x03 << 2) /* 0011 */ -#define L_PTE_MT_MINICACHE (0x06 << 2) /* 0110 (sa1100, xscale) */ -#define L_PTE_MT_WRITEALLOC (0x07 << 2) /* 0111 */ -#define L_PTE_MT_DEV_SHARED (0x04 << 2) /* 0100 */ -#define L_PTE_MT_DEV_NONSHARED (0x0c << 2) /* 1100 */ -#define L_PTE_MT_DEV_WC (0x09 << 2) /* 1001 */ -#define L_PTE_MT_DEV_CACHED (0x0b << 2) /* 1011 */ -#define L_PTE_MT_MASK (0x0f << 2) +#define L_PTE_MT_UNCACHED (_AT(pteval_t, 0x00) << 2) /* 0000 */ +#define L_PTE_MT_BUFFERABLE (_AT(pteval_t, 0x01) << 2) /* 0001 */ +#define L_PTE_MT_WRITETHROUGH (_AT(pteval_t, 0x02) << 2) /* 0010 */ +#define L_PTE_MT_WRITEBACK (_AT(pteval_t, 0x03) << 2) /* 0011 */ +#define L_PTE_MT_MINICACHE (_AT(pteval_t, 0x06) << 2) /* 0110 (sa1100, xscale) */ +#define L_PTE_MT_WRITEALLOC (_AT(pteval_t, 0x07) << 2) /* 0111 */ +#define L_PTE_MT_DEV_SHARED (_AT(pteval_t, 0x04) << 2) /* 0100 */ +#define L_PTE_MT_DEV_NONSHARED (_AT(pteval_t, 0x0c) << 2) /* 1100 */ +#define L_PTE_MT_DEV_WC (_AT(pteval_t, 0x09) << 2) /* 1001 */ +#define L_PTE_MT_DEV_CACHED (_AT(pteval_t, 0x0b) << 2) /* 1011 */ +#define L_PTE_MT_MASK (_AT(pteval_t, 0x0f) << 2) #ifndef __ASSEMBLY__ @@ -201,23 +205,44 @@ extern pgprot_t pgprot_kernel; #define _MOD_PROT(p, b) __pgprot(pgprot_val(p) | (b)) -#define PAGE_NONE pgprot_user -#define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE) -#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_WRITE | L_PTE_EXEC) -#define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER) -#define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_EXEC) -#define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER) -#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_EXEC) -#define PAGE_KERNEL pgprot_kernel -#define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_kernel, L_PTE_EXEC) - -#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT) -#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE) -#define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_WRITE | L_PTE_EXEC) -#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER) -#define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_EXEC) -#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER) -#define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_EXEC) +#define PAGE_NONE _MOD_PROT(pgprot_user, L_PTE_XN | L_PTE_RDONLY) +#define PAGE_SHARED _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_XN) +#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_user, L_PTE_USER) +#define PAGE_COPY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) +#define PAGE_COPY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY) +#define PAGE_READONLY _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) +#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_user, L_PTE_USER | L_PTE_RDONLY) +#define PAGE_KERNEL _MOD_PROT(pgprot_kernel, L_PTE_XN) +#define PAGE_KERNEL_EXEC pgprot_kernel + +#define __PAGE_NONE __pgprot(_L_PTE_DEFAULT | L_PTE_RDONLY | L_PTE_XN) +#define __PAGE_SHARED __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_XN) +#define __PAGE_SHARED_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER) +#define __PAGE_COPY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) +#define __PAGE_COPY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY) +#define __PAGE_READONLY __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY | L_PTE_XN) +#define __PAGE_READONLY_EXEC __pgprot(_L_PTE_DEFAULT | L_PTE_USER | L_PTE_RDONLY) + +#define __pgprot_modify(prot,mask,bits) \ + __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) + +#define pgprot_noncached(prot) \ + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED) + +#define pgprot_writecombine(prot) \ + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE) + +#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE +#define pgprot_dmacoherent(prot) \ + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE | L_PTE_XN) +#define __HAVE_PHYS_MEM_ACCESS_PROT +struct file; +extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t vma_prot); +#else +#define pgprot_dmacoherent(prot) \ + __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED | L_PTE_XN) +#endif #endif /* __ASSEMBLY__ */ @@ -255,26 +280,84 @@ extern pgprot_t pgprot_kernel; extern struct page *empty_zero_page; #define ZERO_PAGE(vaddr) (empty_zero_page) -#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) -#define pfn_pte(pfn,prot) (__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))) -#define pte_none(pte) (!pte_val(pte)) -#define pte_clear(mm,addr,ptep) set_pte_ext(ptep, __pte(0), 0) -#define pte_page(pte) (pfn_to_page(pte_pfn(pte))) -#define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) +extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; + +/* to find an entry in a page-table-directory */ +#define pgd_index(addr) ((addr) >> PGDIR_SHIFT) + +#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr)) + +/* to find an entry in a kernel page-table-directory */ +#define pgd_offset_k(addr) pgd_offset(&init_mm, addr) + +/* + * The "pgd_xxx()" functions here are trivial for a folded two-level + * setup: the pgd is never bad, and a pmd always exists (as it's folded + * into the pgd entry) + */ +#define pgd_none(pgd) (0) +#define pgd_bad(pgd) (0) +#define pgd_present(pgd) (1) +#define pgd_clear(pgdp) do { } while (0) +#define set_pgd(pgd,pgdp) do { } while (0) + + +/* Find an entry in the second-level page table.. */ +#define pmd_offset(dir, addr) ((pmd_t *)(dir)) + +#define pmd_none(pmd) (!pmd_val(pmd)) +#define pmd_present(pmd) (pmd_val(pmd)) +#define pmd_bad(pmd) (pmd_val(pmd) & 2) + +#define copy_pmd(pmdpd,pmdps) \ + do { \ + pmdpd[0] = pmdps[0]; \ + pmdpd[1] = pmdps[1]; \ + flush_pmd_entry(pmdpd); \ + } while (0) + +#define pmd_clear(pmdp) \ + do { \ + pmdp[0] = __pmd(0); \ + pmdp[1] = __pmd(0); \ + clean_pmd_entry(pmdp); \ + } while (0) + +static inline pte_t *pmd_page_vaddr(pmd_t pmd) +{ + return __va(pmd_val(pmd) & PAGE_MASK); +} + +#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd))) + +/* we don't need complex calculations here as the pmd is folded into the pgd */ +#define pmd_addr_end(addr,end) (end) -#define pte_offset_map(dir,addr) (__pte_map(dir) + __pte_index(addr)) -#define pte_unmap(pte) __pte_unmap(pte) #ifndef CONFIG_HIGHPTE -#define __pte_map(dir) pmd_page_vaddr(*(dir)) +#define __pte_map(pmd) pmd_page_vaddr(*(pmd)) #define __pte_unmap(pte) do { } while (0) #else -#define __pte_map(dir) ((pte_t *)kmap_atomic(pmd_page(*(dir))) + PTRS_PER_PTE) -#define __pte_unmap(pte) kunmap_atomic((pte - PTRS_PER_PTE)) +#define __pte_map(pmd) (pte_t *)kmap_atomic(pmd_page(*(pmd))) +#define __pte_unmap(pte) kunmap_atomic(pte) #endif +#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) + +#define pte_offset_kernel(pmd,addr) (pmd_page_vaddr(*(pmd)) + pte_index(addr)) + +#define pte_offset_map(pmd,addr) (__pte_map(pmd) + pte_index(addr)) +#define pte_unmap(pte) __pte_unmap(pte) + +#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) +#define pfn_pte(pfn,prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) + +#define pte_page(pte) pfn_to_page(pte_pfn(pte)) +#define mk_pte(page,prot) pfn_pte(page_to_pfn(page), prot) + #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext) +#define pte_clear(mm,addr,ptep) set_pte_ext(ptep, __pte(0), 0) #if __LINUX_ARM_ARCH__ < 6 static inline void __sync_icache_dcache(pte_t pteval) @@ -295,15 +378,12 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, } } -/* - * The following only work if pte_present() is true. - * Undefined behaviour if not.. - */ +#define pte_none(pte) (!pte_val(pte)) #define pte_present(pte) (pte_val(pte) & L_PTE_PRESENT) -#define pte_write(pte) (pte_val(pte) & L_PTE_WRITE) +#define pte_write(pte) (!(pte_val(pte) & L_PTE_RDONLY)) #define pte_dirty(pte) (pte_val(pte) & L_PTE_DIRTY) #define pte_young(pte) (pte_val(pte) & L_PTE_YOUNG) -#define pte_exec(pte) (pte_val(pte) & L_PTE_EXEC) +#define pte_exec(pte) (!(pte_val(pte) & L_PTE_XN)) #define pte_special(pte) (0) #define pte_present_user(pte) \ @@ -313,8 +393,8 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, #define PTE_BIT_FUNC(fn,op) \ static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; } -PTE_BIT_FUNC(wrprotect, &= ~L_PTE_WRITE); -PTE_BIT_FUNC(mkwrite, |= L_PTE_WRITE); +PTE_BIT_FUNC(wrprotect, |= L_PTE_RDONLY); +PTE_BIT_FUNC(mkwrite, &= ~L_PTE_RDONLY); PTE_BIT_FUNC(mkclean, &= ~L_PTE_DIRTY); PTE_BIT_FUNC(mkdirty, |= L_PTE_DIRTY); PTE_BIT_FUNC(mkold, &= ~L_PTE_YOUNG); @@ -322,101 +402,13 @@ PTE_BIT_FUNC(mkyoung, |= L_PTE_YOUNG); static inline pte_t pte_mkspecial(pte_t pte) { return pte; } -#define __pgprot_modify(prot,mask,bits) \ - __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) - -/* - * Mark the prot value as uncacheable and unbufferable. - */ -#define pgprot_noncached(prot) \ - __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_UNCACHED) -#define pgprot_writecombine(prot) \ - __pgprot_modify(prot, L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE) -#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE -#define pgprot_dmacoherent(prot) \ - __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_BUFFERABLE) -#define __HAVE_PHYS_MEM_ACCESS_PROT -struct file; -extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, - unsigned long size, pgprot_t vma_prot); -#else -#define pgprot_dmacoherent(prot) \ - __pgprot_modify(prot, L_PTE_MT_MASK|L_PTE_EXEC, L_PTE_MT_UNCACHED) -#endif - -#define pmd_none(pmd) (!pmd_val(pmd)) -#define pmd_present(pmd) (pmd_val(pmd)) -#define pmd_bad(pmd) (pmd_val(pmd) & 2) - -#define copy_pmd(pmdpd,pmdps) \ - do { \ - pmdpd[0] = pmdps[0]; \ - pmdpd[1] = pmdps[1]; \ - flush_pmd_entry(pmdpd); \ - } while (0) - -#define pmd_clear(pmdp) \ - do { \ - pmdp[0] = __pmd(0); \ - pmdp[1] = __pmd(0); \ - clean_pmd_entry(pmdp); \ - } while (0) - -static inline pte_t *pmd_page_vaddr(pmd_t pmd) -{ - unsigned long ptr; - - ptr = pmd_val(pmd) & ~(PTRS_PER_PTE * sizeof(void *) - 1); - ptr += PTRS_PER_PTE * sizeof(void *); - - return __va(ptr); -} - -#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd))) - -/* we don't need complex calculations here as the pmd is folded into the pgd */ -#define pmd_addr_end(addr,end) (end) - -/* - * Conversion functions: convert a page and protection to a page entry, - * and a page entry and page directory to the page they refer to. - */ -#define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) - -/* - * The "pgd_xxx()" functions here are trivial for a folded two-level - * setup: the pgd is never bad, and a pmd always exists (as it's folded - * into the pgd entry) - */ -#define pgd_none(pgd) (0) -#define pgd_bad(pgd) (0) -#define pgd_present(pgd) (1) -#define pgd_clear(pgdp) do { } while (0) -#define set_pgd(pgd,pgdp) do { } while (0) - -/* to find an entry in a page-table-directory */ -#define pgd_index(addr) ((addr) >> PGDIR_SHIFT) - -#define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr)) - -/* to find an entry in a kernel page-table-directory */ -#define pgd_offset_k(addr) pgd_offset(&init_mm, addr) - -/* Find an entry in the second-level page table.. */ -#define pmd_offset(dir, addr) ((pmd_t *)(dir)) - -/* Find an entry in the third-level page table.. */ -#define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) - static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { - const unsigned long mask = L_PTE_EXEC | L_PTE_WRITE | L_PTE_USER; + const pteval_t mask = L_PTE_XN | L_PTE_RDONLY | L_PTE_USER; pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); return pte; } -extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; - /* * Encode and decode a swap entry. Swap entries are stored in the Linux * page tables as follows: @@ -481,6 +473,9 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; #define pgtable_cache_init() do { } while (0) +void identity_mapping_add(pgd_t *, unsigned long, unsigned long); +void identity_mapping_del(pgd_t *, unsigned long, unsigned long); + #endif /* !__ASSEMBLY__ */ #endif /* CONFIG_MMU */ |