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#ifndef __ASM_SH_PGTABLE_H
#define __ASM_SH_PGTABLE_H
/* Copyright (C) 1999 Niibe Yutaka */
/*
* 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 <linux/threads.h>
extern pgd_t swapper_pg_dir[1024];
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_page_to_ram(page) write back kernel page to ram
*
* 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_icache_range(start, end) do { } while (0)
#define flush_icache_page(vma,pg) do { } while (0)
#elif defined(__SH4__)
/*
* Caches are broken on SH-4, so we need them.
*/
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_page_to_ram(unsigned long page_va);
#define flush_page_to_ram(page) __flush_page_to_ram(page_address(page))
extern void flush_icache_range(unsigned long start, unsigned long end);
extern void flush_icache_page(struct vm_area_struct *vma, struct page *pg);
#endif
/*
* 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) (mem_map + MAP_NR(empty_zero_page))
#endif /* !__ASSEMBLY__ */
#include <asm/pgtable-2level.h>
#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 USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
#define TWOLEVEL_PGDIR_SHIFT 22
#define BOOT_USER_PGD_PTRS (PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
#define BOOT_KERNEL_PGD_PTRS (1024-BOOT_USER_PGD_PTRS)
#ifndef __ASSEMBLY__
#define VMALLOC_START P3SEG
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
#define VMALLOC_END P4SEG
#define _PAGE_READ 0x001 /* software: read access allowed */
#define _PAGE_ACCESSED 0x002 /* software: page referenced */
#define _PAGE_DIRTY 0x004 /* D-bit : page changed */
#define _PAGE_CACHABLE 0x008 /* C-bit : cachable */
/* 0x010 */
#define _PAGE_RW 0x020 /* PR0-bit : write access allowed */
#define _PAGE_USER 0x040 /* PR1-bit : user space access allowed */
#define _PAGE_PROTNONE 0x080 /* software: if not present */
#define _PAGE_PRESENT 0x100 /* V-bit : page is valid */
#if defined(__sh3__)
/* Mask which drop software flags */
#define _PAGE_FLAGS_HARDWARE_MASK 0x1ffff16c
/* Flags defalult: SZ=1 (4k-byte), C=0 (non-cachable), SH=0 (not shared) */
#define _PAGE_FLAGS_HARDWARE_DEFAULT 0x00000010
#elif defined(__SH4__)
/* Mask which drops software flags */
#define _PAGE_FLAGS_HARDWARE_MASK 0x1ffff16c
/* Flags defalult: SZ=01 (4k-byte), C=0 (non-cachable), SH=0 (not shared), WT=0 */
#define _PAGE_FLAGS_HARDWARE_DEFAULT 0x00000010
#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)
#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED)
#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED)
#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED)
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED)
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED)
#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED)
/*
* As i386 and MIPS, SuperH can't do page protection for execute, and
* considers that the same are 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
/*
* Handling allocation failures during page table setup.
*/
extern void __handle_bad_pmd(pmd_t * pmd);
extern void __handle_bad_pmd_kernel(pmd_t * pmd);
#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 pte_pagenr(x) ((unsigned long)(((pte_val(x) -__MEMORY_START) >> PAGE_SHIFT)))
#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) ({ if (!(page)->virtual) BUG(); (page)->virtual; })
#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
#define pte_page(x) (mem_map+pte_pagenr(x))
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
extern inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
extern inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
extern inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
extern inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
extern inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
extern inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
extern inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
extern inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
extern inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
extern inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
extern inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
extern inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
extern inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
extern inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
extern 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(((page)-mem_map) * \
(unsigned long long)PAGE_SIZE + pgprot_val(pgprot) + \
__MEMORY_START)); \
__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; })
extern 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)
#define __pmd_offset(address) \
(((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
/* 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 */
#define SWP_TYPE(x) (((x).val >> 1) & 0x3f)
#define SWP_OFFSET(x) ((x).val >> 8)
#define SWP_ENTRY(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
#define pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define swp_entry_to_pte(x) ((pte_t) { (x).val })
#define module_map vmalloc
#define module_unmap vfree
#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
#endif /* __ASM_SH_PAGE_H */
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