/* * This file contains the functions and defines necessary to modify and * use the SuperH page table tree. * * Copyright (C) 1999 Niibe Yutaka * Copyright (C) 2002 - 2005 Paul Mundt * * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of this * archive for more details. */ #ifndef __ASM_SH_PGTABLE_H #define __ASM_SH_PGTABLE_H #include #include #define PTRS_PER_PGD 1024 #ifndef __ASSEMBLY__ #include #include extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 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[PAGE_SIZE / sizeof(unsigned long)]; #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) #endif /* !__ASSEMBLY__ */ /* traditional two-level paging structure */ #define PGDIR_SHIFT 22 #define PTRS_PER_PMD 1 #define PTRS_PER_PTE 1024 #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 0 #define PTE_PHYS_MASK 0x1ffff000 /* * 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) /* * Linux PTEL encoding. * * Hardware and software bit definitions for the PTEL value: * * - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4). * * - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the * hardware PTEL value can't have the SH-bit set when MMUCR.IX is set, * which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT). * * In order to keep this relatively clean, do not use these for defining * SH-3 specific flags until all of the other unused bits have been * exhausted. * * - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE. * * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages. * Bit 10 is used for _PAGE_ACCESSED, bit 11 remains unused. * * - Bits 31, 30, and 29 remain unused by everyone and can be used for future * software flags, although care must be taken to update _PAGE_CLEAR_FLAGS. */ #define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */ #define _PAGE_HW_SHARED 0x002 /* SH-bit : 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_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 drops unused bits from the PTEL value */ #ifdef CONFIG_CPU_SH3 #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \ _PAGE_FILE | _PAGE_SZ1 | \ _PAGE_HW_SHARED) #else #define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE) #endif #define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS)) /* 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_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) #ifndef __ASSEMBLY__ #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_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 #endif /* __ASSEMBLY__ */ /* * 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 #ifndef __ASSEMBLY__ /* * Certain architectures need to do special things when PTEs * within a page table are directly modified. Thus, the following * hook is made available. */ #define set_pte(pteptr, pteval) (*(pteptr) = pteval) #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) /* * (pmds are folded into pgds so this doesn't get actually called, * but the define is needed for a generic inline function.) */ #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval) #define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT))) #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) #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; } #ifdef CONFIG_HUGETLB_PAGE static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; } #endif /* * 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 pmd_page_vaddr(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_vaddr(*(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) #define pte_ERROR(e) \ printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) #define pgd_ERROR(e) \ printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 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; #define kern_addr_valid(addr) (1) #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) struct mm_struct; /* * 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 #endif /* !__ASSEMBLY__ */ #endif /* __ASM_SH_PAGE_H */