diff options
Diffstat (limited to 'kernel/arch/m32r/include/asm/pgtable.h')
| -rw-r--r-- | kernel/arch/m32r/include/asm/pgtable.h | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/kernel/arch/m32r/include/asm/pgtable.h b/kernel/arch/m32r/include/asm/pgtable.h new file mode 100644 index 000000000..8c1fb902a --- /dev/null +++ b/kernel/arch/m32r/include/asm/pgtable.h @@ -0,0 +1,347 @@ +#ifndef _ASM_M32R_PGTABLE_H +#define _ASM_M32R_PGTABLE_H + +#include <asm-generic/4level-fixup.h> + +#ifdef __KERNEL__ +/* + * The Linux memory management assumes a three-level page table setup. On + * the M32R, we use that, but "fold" the mid level into the top-level page + * table, so that we physically have the same two-level page table as the + * M32R mmu expects. + * + * This file contains the functions and defines necessary to modify and use + * the M32R page table tree. + */ + +/* CAUTION!: If you change macro definitions in this file, you might have to + * change arch/m32r/mmu.S manually. + */ + +#ifndef __ASSEMBLY__ + +#include <linux/threads.h> +#include <linux/bitops.h> +#include <asm/processor.h> +#include <asm/addrspace.h> +#include <asm/page.h> + +struct mm_struct; +struct vm_area_struct; + +extern pgd_t swapper_pg_dir[1024]; +extern void paging_init(void); + +/* + * ZERO_PAGE is a global shared page that is always zero: used + * for zero-mapped memory areas etc.. + */ +extern unsigned long empty_zero_page[1024]; +#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) + +#endif /* !__ASSEMBLY__ */ + +#ifndef __ASSEMBLY__ +#include <asm/pgtable-2level.h> +#endif + +#define pgtable_cache_init() do { } while (0) + +#define PMD_SIZE (1UL << PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE - 1)) +#define PGDIR_SIZE (1UL << PGDIR_SHIFT) +#define PGDIR_MASK (~(PGDIR_SIZE - 1)) + +#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE) +#define FIRST_USER_ADDRESS 0UL + +#ifndef __ASSEMBLY__ +/* Just any arbitrary offset to the start of the vmalloc VM area: the + * current 8MB value just means that there will be a 8MB "hole" after the + * physical memory until the kernel virtual memory starts. That means that + * any out-of-bounds memory accesses will hopefully be caught. + * The vmalloc() routines leaves a hole of 4kB between each vmalloced + * area for the same reason. ;) + */ +#define VMALLOC_START KSEG2 +#define VMALLOC_END KSEG3 + +/* + * M32R TLB format + * + * [0] [1:19] [20:23] [24:31] + * +-----------------------+----+-------------+ + * | VPN |0000| ASID | + * +-----------------------+----+-------------+ + * +-+---------------------+----+-+---+-+-+-+-+ + * |0 PPN |0000|N|AC |L|G|V| | + * +-+---------------------+----+-+---+-+-+-+-+ + * RWX + */ + +#define _PAGE_BIT_DIRTY 0 /* software: page changed */ +#define _PAGE_BIT_PRESENT 1 /* Valid: page is valid */ +#define _PAGE_BIT_GLOBAL 2 /* Global */ +#define _PAGE_BIT_LARGE 3 /* Large */ +#define _PAGE_BIT_EXEC 4 /* Execute */ +#define _PAGE_BIT_WRITE 5 /* Write */ +#define _PAGE_BIT_READ 6 /* Read */ +#define _PAGE_BIT_NONCACHABLE 7 /* Non cachable */ +#define _PAGE_BIT_ACCESSED 8 /* software: page referenced */ +#define _PAGE_BIT_PROTNONE 9 /* software: if not present */ + +#define _PAGE_DIRTY (1UL << _PAGE_BIT_DIRTY) +#define _PAGE_PRESENT (1UL << _PAGE_BIT_PRESENT) +#define _PAGE_GLOBAL (1UL << _PAGE_BIT_GLOBAL) +#define _PAGE_LARGE (1UL << _PAGE_BIT_LARGE) +#define _PAGE_EXEC (1UL << _PAGE_BIT_EXEC) +#define _PAGE_WRITE (1UL << _PAGE_BIT_WRITE) +#define _PAGE_READ (1UL << _PAGE_BIT_READ) +#define _PAGE_NONCACHABLE (1UL << _PAGE_BIT_NONCACHABLE) +#define _PAGE_ACCESSED (1UL << _PAGE_BIT_ACCESSED) +#define _PAGE_PROTNONE (1UL << _PAGE_BIT_PROTNONE) + +#define _PAGE_TABLE \ + ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \ + | _PAGE_DIRTY ) +#define _KERNPG_TABLE \ + ( _PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED \ + | _PAGE_DIRTY ) +#define _PAGE_CHG_MASK \ + ( PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY ) + +#ifdef CONFIG_MMU +#define PAGE_NONE \ + __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) +#define PAGE_SHARED \ + __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | _PAGE_ACCESSED) +#define PAGE_SHARED_EXEC \ + __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ \ + | _PAGE_ACCESSED) +#define PAGE_COPY \ + __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED) +#define PAGE_COPY_EXEC \ + __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED) +#define PAGE_READONLY \ + __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_ACCESSED) +#define PAGE_READONLY_EXEC \ + __pgprot(_PAGE_PRESENT | _PAGE_EXEC | _PAGE_READ | _PAGE_ACCESSED) + +#define __PAGE_KERNEL \ + ( _PAGE_PRESENT | _PAGE_EXEC | _PAGE_WRITE | _PAGE_READ | _PAGE_DIRTY \ + | _PAGE_ACCESSED ) +#define __PAGE_KERNEL_RO ( __PAGE_KERNEL & ~_PAGE_WRITE ) +#define __PAGE_KERNEL_NOCACHE ( __PAGE_KERNEL | _PAGE_NONCACHABLE) + +#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL) + +#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL) +#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO) +#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE) + +#else +#define PAGE_NONE __pgprot(0) +#define PAGE_SHARED __pgprot(0) +#define PAGE_SHARED_EXEC __pgprot(0) +#define PAGE_COPY __pgprot(0) +#define PAGE_COPY_EXEC __pgprot(0) +#define PAGE_READONLY __pgprot(0) +#define PAGE_READONLY_EXEC __pgprot(0) + +#define PAGE_KERNEL __pgprot(0) +#define PAGE_KERNEL_RO __pgprot(0) +#define PAGE_KERNEL_NOCACHE __pgprot(0) +#endif /* CONFIG_MMU */ + + /* xwr */ +#define __P000 PAGE_NONE +#define __P001 PAGE_READONLY +#define __P010 PAGE_COPY +#define __P011 PAGE_COPY +#define __P100 PAGE_READONLY_EXEC +#define __P101 PAGE_READONLY_EXEC +#define __P110 PAGE_COPY_EXEC +#define __P111 PAGE_COPY_EXEC + +#define __S000 PAGE_NONE +#define __S001 PAGE_READONLY +#define __S010 PAGE_SHARED +#define __S011 PAGE_SHARED +#define __S100 PAGE_READONLY_EXEC +#define __S101 PAGE_READONLY_EXEC +#define __S110 PAGE_SHARED_EXEC +#define __S111 PAGE_SHARED_EXEC + +/* page table for 0-4MB for everybody */ + +#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE)) +#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) + +#define pmd_none(x) (!pmd_val(x)) +#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) +#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) +#define pmd_bad(x) ((pmd_val(x) & ~PAGE_MASK) != _KERNPG_TABLE) + +#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) + +/* + * The following only work if pte_present() is true. + * Undefined behaviour if not.. + */ +static inline int pte_dirty(pte_t pte) +{ + return pte_val(pte) & _PAGE_DIRTY; +} + +static inline int pte_young(pte_t pte) +{ + return pte_val(pte) & _PAGE_ACCESSED; +} + +static inline int pte_write(pte_t pte) +{ + return pte_val(pte) & _PAGE_WRITE; +} + +static inline int pte_special(pte_t pte) +{ + return 0; +} + +static inline pte_t pte_mkclean(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_DIRTY; + return pte; +} + +static inline pte_t pte_mkold(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_ACCESSED; + return pte; +} + +static inline pte_t pte_wrprotect(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_WRITE; + return pte; +} + +static inline pte_t pte_mkdirty(pte_t pte) +{ + pte_val(pte) |= _PAGE_DIRTY; + return pte; +} + +static inline pte_t pte_mkyoung(pte_t pte) +{ + pte_val(pte) |= _PAGE_ACCESSED; + return pte; +} + +static inline pte_t pte_mkwrite(pte_t pte) +{ + pte_val(pte) |= _PAGE_WRITE; + return pte; +} + +static inline pte_t pte_mkspecial(pte_t pte) +{ + return pte; +} + +static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) +{ + return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep); +} + +static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) +{ + clear_bit(_PAGE_BIT_WRITE, ptep); +} + +/* + * Macro and implementation to make a page protection as uncachable. + */ +static inline pgprot_t pgprot_noncached(pgprot_t _prot) +{ + unsigned long prot = pgprot_val(_prot); + + prot |= _PAGE_NONCACHABLE; + return __pgprot(prot); +} + +#define pgprot_writecombine(prot) pgprot_noncached(prot) + +/* + * 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, pgprot) pfn_pte(page_to_pfn(page), pgprot) + +static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) +{ + set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \ + | pgprot_val(newprot))); + + return pte; +} + +/* + * Conversion functions: convert a page and protection to a page entry, + * and a page entry and page directory to the page they refer to. + */ + +static inline void pmd_set(pmd_t * pmdp, pte_t * ptep) +{ + pmd_val(*pmdp) = (((unsigned long) ptep) & PAGE_MASK); +} + +#define pmd_page_vaddr(pmd) \ + ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) + +#ifndef CONFIG_DISCONTIGMEM +#define pmd_page(pmd) (mem_map + ((pmd_val(pmd) >> PAGE_SHIFT) - PFN_BASE)) +#endif /* !CONFIG_DISCONTIGMEM */ + +/* to find an entry in a page-table-directory. */ +#define pgd_index(address) \ + (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) + +#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) + +/* to find an entry in a kernel page-table-directory */ +#define pgd_offset_k(address) pgd_offset(&init_mm, address) + +#define pmd_index(address) \ + (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) + +#define pte_index(address) \ + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pte_offset_kernel(dir, address) \ + ((pte_t *)pmd_page_vaddr(*(dir)) + pte_index(address)) +#define pte_offset_map(dir, address) \ + ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address)) +#define pte_unmap(pte) do { } while (0) + +/* Encode and de-code a swap entry */ +#define __swp_type(x) (((x).val >> 2) & 0x1f) +#define __swp_offset(x) ((x).val >> 10) +#define __swp_entry(type, offset) \ + ((swp_entry_t) { ((type) << 2) | ((offset) << 10) }) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) + +#endif /* !__ASSEMBLY__ */ + +/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ +#define kern_addr_valid(addr) (1) + +#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG +#define __HAVE_ARCH_PTEP_GET_AND_CLEAR +#define __HAVE_ARCH_PTEP_SET_WRPROTECT +#define __HAVE_ARCH_PTE_SAME +#include <asm-generic/pgtable.h> + +#endif /* __KERNEL__ */ + +#endif /* _ASM_M32R_PGTABLE_H */ |