#ifndef __ASM_SH_PGTABLE_H #define __ASM_SH_PGTABLE_H /* Copyright (C) 1999 Niibe Yutaka */ #include /* * This file contains the functions and defines necessary to modify and use * the SuperH page table tree. */ #ifndef __ASSEMBLY__ #include #include #include extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern void paging_init(void); #if defined(__sh3__) /* Cache flushing: * * - flush_cache_all() flushes entire cache * - flush_cache_mm(mm) flushes the specified mm context's cache lines * - flush_cache_page(mm, vmaddr) flushes a single page * - flush_cache_range(mm, start, end) flushes a range of pages * * - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache * - flush_page_to_ram(page) write back kernel page to ram * - flush_icache_range(start, end) flushes(invalidates) a range for icache * - flush_icache_page(vma, pg) flushes(invalidates) a page for icache * * Caches are indexed (effectively) by physical address on SH-3, so * we don't need them. */ #define flush_cache_all() do { } while (0) #define flush_cache_mm(mm) do { } while (0) #define flush_cache_range(mm, start, end) do { } while (0) #define flush_cache_page(vma, vmaddr) do { } while (0) #define flush_page_to_ram(page) do { } while (0) #define flush_dcache_page(page) do { } while (0) #define flush_icache_range(start, end) do { } while (0) #define flush_icache_page(vma,pg) do { } while (0) #define flush_cache_sigtramp(vaddr) do { } while (0) #define p3_cache_init() do { } while (0) #elif defined(__SH4__) /* * Caches are broken on SH-4, so we need them. */ /* Page is 4K, OC size is 16K, there are four lines. */ #define CACHE_ALIAS 0x00003000 extern void flush_cache_all(void); extern void flush_cache_mm(struct mm_struct *mm); extern void flush_cache_range(struct mm_struct *mm, unsigned long start, unsigned long end); extern void flush_cache_page(struct vm_area_struct *vma, unsigned long addr); extern void flush_dcache_page(struct page *pg); extern void flush_icache_range(unsigned long start, unsigned long end); extern void flush_cache_sigtramp(unsigned long addr); #define flush_page_to_ram(page) do { } while (0) #define flush_icache_page(vma,pg) do { } while (0) /* Initialization of P3 area for copy_user_page */ extern void p3_cache_init(void); #define PG_mapped PG_arch_1 /* We provide our own get_unmapped_area to avoid cache alias issue */ #define HAVE_ARCH_UNMAPPED_AREA #endif /* Flush (write-back only) a region (smaller than a page) */ extern void __flush_wback_region(void *start, int size); /* Flush (write-back & invalidate) a region (smaller than a page) */ extern void __flush_purge_region(void *start, int size); /* Flush (invalidate only) a region (smaller than a page) */ extern void __flush_invalidate_region(void *start, int size); /* * 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 __beep() asm("") #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_VMADDR(x) ((unsigned long)(x)) #define VMALLOC_END P4SEG /* 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 */ /* 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 */ /* 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 */ /* 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 */ #if defined(__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 0x1ffff1fc #else #define _PAGE_FLAGS_HARDWARE_MASK 0x1ffff1fe #endif /* Hardware flags: SZ=1 (4k-byte) */ #define _PAGE_FLAGS_HARD 0x00000010 #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) #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_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)) /* * 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(xp) do { set_pte(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) /* * Permanent address of a page. Obviously must never be * called on a highmem page. */ #define page_address(page) ((page)->virtual) /* P1 address of the page */ #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_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; } /* * 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) \ ({ pte_t __pte; \ \ set_pte(&__pte, __pte(PHYSADDR(page_address(page)) \ +pgprot_val(pgprot))); \ __pte; \ }) /* This takes a physical page address that is used by the remapping functions */ #define mk_pte_phys(physpage, pgprot) \ ({ pte_t __pte; set_pte(&__pte, __pte(physpage + pgprot_val(pgprot))); __pte; }) 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(pmd) \ ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) /* to find an entry in a page-table-directory. */ #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) #define __pgd_offset(address) pgd_index(address) #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_offset(address) \ ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) #define pte_offset(dir, address) ((pte_t *) pmd_page(*(dir)) + \ __pte_offset(address)) 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_PROTONOE 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) }) #define swp_entry_to_pte(x) ((pte_t) { (x).val }) /* * Routines for update of PTE * * We just can use generic implementation, as SuperH has no SMP feature. * (We needed atomic implementation for SMP) * */ #define pte_same(A,B) (pte_val(A) == pte_val(B)) #endif /* !__ASSEMBLY__ */ /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ #define PageSkip(page) (0) #define kern_addr_valid(addr) (1) #define io_remap_page_range remap_page_range /* * No page table caches to initialise */ #define pgtable_cache_init() do { } while (0) #endif /* __ASM_SH_PAGE_H */