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Diffstat (limited to 'include/asm-sh/pgtable.h')
| -rw-r--r-- | include/asm-sh/pgtable.h | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/include/asm-sh/pgtable.h b/include/asm-sh/pgtable.h new file mode 100644 index 00000000000..8a9689d5366 --- /dev/null +++ b/include/asm-sh/pgtable.h @@ -0,0 +1,306 @@ +#ifndef __ASM_SH_PGTABLE_H +#define __ASM_SH_PGTABLE_H + +#include <asm-generic/4level-fixup.h> + +/* + * Copyright (C) 1999 Niibe Yutaka + * Copyright (C) 2002, 2003, 2004 Paul Mundt + */ + +#include <linux/config.h> +#include <asm/pgtable-2level.h> + +/* + * This file contains the functions and defines necessary to modify and use + * the SuperH page table tree. + */ +#ifndef __ASSEMBLY__ +#include <asm/processor.h> +#include <asm/addrspace.h> +#include <asm/fixmap.h> +#include <linux/threads.h> + +extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; +extern void paging_init(void); + +/* + * Basically we have the same two-level (which is the logical three level + * Linux page table layout folded) page tables as the i386. + */ + +/* + * 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__ */ + +#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_PGD_NR 0 + +#define PTE_PHYS_MASK 0x1ffff000 + +#ifndef __ASSEMBLY__ +/* + * First 1MB map is used by fixed purpose. + * Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c) + */ +#define VMALLOC_START (P3SEG+0x00100000) +#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) + +#define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ +#define _PAGE_HW_SHARED 0x002 /* SH-bit : page is shared among processes */ +#define _PAGE_DIRTY 0x004 /* D-bit : page changed */ +#define _PAGE_CACHABLE 0x008 /* C-bit : cachable */ +#define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */ +#define _PAGE_RW 0x020 /* PR0-bit : write access allowed */ +#define _PAGE_USER 0x040 /* PR1-bit : user space access allowed */ +#define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */ +#define _PAGE_PRESENT 0x100 /* V-bit : page is valid */ +#define _PAGE_PROTNONE 0x200 /* software: if not present */ +#define _PAGE_ACCESSED 0x400 /* software: page referenced */ +#define _PAGE_U0_SHARED 0x800 /* software: page is shared in user space */ + +#define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ + +/* software: moves to PTEA.TC (Timing Control) */ +#define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */ +#define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */ + +/* software: moves to PTEA.SA[2:0] (Space Attributes) */ +#define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */ +#define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */ +#define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */ +#define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */ +#define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */ +#define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */ +#define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */ + + +/* Mask which drop software flags + * We also drop WT bit since it is used for _PAGE_FILE + * bit in this implementation. + */ +#define _PAGE_CLEAR_FLAGS (_PAGE_WT | _PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_U0_SHARED) + +#if defined(CONFIG_CPU_SH3) +/* + * MMU on SH-3 has bug on SH-bit: We can't use it if MMUCR.IX=1. + * Work around: Just drop SH-bit. + */ +#define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS | _PAGE_HW_SHARED)) +#else +#define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS)) +#endif + +/* Hardware flags: SZ0=1 (4k-byte) */ +#define _PAGE_FLAGS_HARD _PAGE_SZ0 + +#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) +#define _PAGE_SZHUGE (_PAGE_SZ1) +#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) +#define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1) +#endif + +#define _PAGE_SHARED _PAGE_U0_SHARED + +#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) +#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) +#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_SHARED) + +#ifdef CONFIG_MMU +#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD) +#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_SHARED | _PAGE_FLAGS_HARD) +#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) +#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD) +#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) +#define PAGE_KERNEL_NOCACHE \ + __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) +#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD) +#define PAGE_KERNEL_PCC(slot, type) \ + __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | (type)) +#else /* no mmu */ +#define PAGE_NONE __pgprot(0) +#define PAGE_SHARED __pgprot(0) +#define PAGE_COPY __pgprot(0) +#define PAGE_READONLY __pgprot(0) +#define PAGE_KERNEL __pgprot(0) +#define PAGE_KERNEL_NOCACHE __pgprot(0) +#define PAGE_KERNEL_RO __pgprot(0) +#define PAGE_KERNEL_PCC __pgprot(0) +#endif + +/* + * As i386 and MIPS, SuperH can't do page protection for execute, and + * considers that the same as a read. Also, write permissions imply + * read permissions. This is the closest we can get.. + */ + +#define __P000 PAGE_NONE +#define __P001 PAGE_READONLY +#define __P010 PAGE_COPY +#define __P011 PAGE_COPY +#define __P100 PAGE_READONLY +#define __P101 PAGE_READONLY +#define __P110 PAGE_COPY +#define __P111 PAGE_COPY + +#define __S000 PAGE_NONE +#define __S001 PAGE_READONLY +#define __S010 PAGE_SHARED +#define __S011 PAGE_SHARED +#define __S100 PAGE_READONLY +#define __S101 PAGE_READONLY +#define __S110 PAGE_SHARED +#define __S111 PAGE_SHARED + +#define pte_none(x) (!pte_val(x)) +#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 & ~_PAGE_USER)) != _KERNPG_TABLE) + +#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) +#define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK) + +/* + * The following only work if pte_present() is true. + * Undefined behaviour if not.. + */ +static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; } +static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; } +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_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } +static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; } +static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); } + +static inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; } +static inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; } +static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; } +static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; } +static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; } +static inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; } +static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; } +static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; } +static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; } +static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; } + +/* + * Macro and implementation to make a page protection as uncachable. + */ +#define pgprot_noncached pgprot_noncached + +static inline pgprot_t pgprot_noncached(pgprot_t _prot) +{ + unsigned long prot = pgprot_val(_prot); + + prot &= ~_PAGE_CACHABLE; + return __pgprot(prot); +} + +#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE) + +/* + * Conversion functions: convert a page and protection to a page entry, + * and a page entry and page directory to the page they refer to. + * + * extern pte_t mk_pte(struct page *page, pgprot_t pgprot) + */ +#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; } + +#define page_pte(page) page_pte_prot(page, __pgprot(0)) + +#define pmd_page_kernel(pmd) \ +((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) + +#define pmd_page(pmd) \ + (phys_to_page(pmd_val(pmd))) + +/* 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) + +/* Find an entry in the third-level page table.. */ +#define pte_index(address) \ + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pte_offset_kernel(dir, address) \ + ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(address)) +#define pte_offset_map(dir, address) pte_offset_kernel(dir, address) +#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address) +#define pte_unmap(pte) do { } while (0) +#define pte_unmap_nested(pte) do { } while (0) + +struct vm_area_struct; +extern void update_mmu_cache(struct vm_area_struct * vma, + unsigned long address, pte_t pte); + +/* Encode and de-code a swap entry */ +/* + * NOTE: We should set ZEROs at the position of _PAGE_PRESENT + * and _PAGE_PROTNONE bits + */ +#define __swp_type(x) ((x).val & 0xff) +#define __swp_offset(x) ((x).val >> 10) +#define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 10) }) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 }) + +/* + * Encode and decode a nonlinear file mapping entry + */ +#define PTE_FILE_MAX_BITS 29 +#define pte_to_pgoff(pte) (pte_val(pte) >> 1) +#define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE }) + +typedef pte_t *pte_addr_t; + +#endif /* !__ASSEMBLY__ */ + +#define kern_addr_valid(addr) (1) + +#define io_remap_page_range(vma, vaddr, paddr, size, prot) \ + remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot) + +#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ + remap_pfn_range(vma, vaddr, pfn, size, prot) + +#define MK_IOSPACE_PFN(space, pfn) (pfn) +#define GET_IOSPACE(pfn) 0 +#define GET_PFN(pfn) (pfn) + +/* + * No page table caches to initialise + */ +#define pgtable_cache_init() do { } while (0) + +#ifndef CONFIG_MMU +extern unsigned int kobjsize(const void *objp); +#endif /* !CONFIG_MMU */ + +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB) +#define __HAVE_ARCH_PTEP_GET_AND_CLEAR +extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); +#endif + +#include <asm-generic/pgtable.h> + +#endif /* __ASM_SH_PAGE_H */ + |