LXR linux/include/asm-sh/page.h

   1#ifndef __ASM_SH_PAGE_H
   2#define __ASM_SH_PAGE_H
   3
   4/*
   5 * Copyright (C) 1999  Niibe Yutaka
   6 */
   7
   8/*
   9   [ P0/U0 (virtual) ]          0x00000000     <------ User space
  10   [ P1 (fixed)   cached ]      0x80000000     <------ Kernel space
  11   [ P2 (fixed)  non-cachable]  0xA0000000     <------ Physical access
  12   [ P3 (virtual) cached]       0xC0000000     <------ vmalloced area
  13   [ P4 control   ]             0xE0000000
  14 */
  15
  16/* PAGE_SHIFT determines the page size */
  17#if defined(CONFIG_PAGE_SIZE_4KB)
  18# define PAGE_SHIFT     12
  19#elif defined(CONFIG_PAGE_SIZE_8KB)
  20# define PAGE_SHIFT     13
  21#elif defined(CONFIG_PAGE_SIZE_64KB)
  22# define PAGE_SHIFT     16
  23#else
  24# error "Bogus kernel page size?"
  25#endif
  26
  27#ifdef __ASSEMBLY__
  28#define PAGE_SIZE       (1 << PAGE_SHIFT)
  29#else
  30#define PAGE_SIZE       (1UL << PAGE_SHIFT)
  31#endif
  32
  33#define PAGE_MASK       (~(PAGE_SIZE-1))
  34#define PTE_MASK        PAGE_MASK
  35
  36#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  37#define HPAGE_SHIFT     16
  38#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  39#define HPAGE_SHIFT     18
  40#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  41#define HPAGE_SHIFT     20
  42#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  43#define HPAGE_SHIFT     22
  44#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
  45#define HPAGE_SHIFT     26
  46#endif
  47
  48#ifdef CONFIG_HUGETLB_PAGE
  49#define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  50#define HPAGE_MASK              (~(HPAGE_SIZE-1))
  51#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  52#endif
  53
  54#ifdef __KERNEL__
  55#ifndef __ASSEMBLY__
  56
  57extern void (*clear_page)(void *to);
  58extern void (*copy_page)(void *to, void *from);
  59
  60extern unsigned long shm_align_mask;
  61
  62#ifdef CONFIG_MMU
  63extern void clear_page_slow(void *to);
  64extern void copy_page_slow(void *to, void *from);
  65#else
  66extern void clear_page_nommu(void *to);
  67extern void copy_page_nommu(void *to, void *from);
  68#endif
  69
  70#if defined(CONFIG_MMU) && (defined(CONFIG_CPU_SH4) || \
  71        defined(CONFIG_SH7705_CACHE_32KB))
  72struct page;
  73extern void clear_user_page(void *to, unsigned long address, struct page *pg);
  74extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
  75extern void __clear_user_page(void *to, void *orig_to);
  76extern void __copy_user_page(void *to, void *from, void *orig_to);
  77#elif defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH3) || !defined(CONFIG_MMU)
  78#define clear_user_page(page, vaddr, pg)        clear_page(page)
  79#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  80#endif
  81
  82/*
  83 * These are used to make use of C type-checking..
  84 */
  85#ifdef CONFIG_X2TLB
  86typedef struct { unsigned long pte_low, pte_high; } pte_t;
  87typedef struct { unsigned long long pgprot; } pgprot_t;
  88#define pte_val(x) \
  89        ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  90#define __pte(x) \
  91        ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  92#else
  93typedef struct { unsigned long pte_low; } pte_t;
  94typedef struct { unsigned long pgprot; } pgprot_t;
  95#define pte_val(x)      ((x).pte_low)
  96#define __pte(x) ((pte_t) { (x) } )
  97#endif
  98
  99typedef struct { unsigned long pgd; } pgd_t;
 100
 101#define pgd_val(x)      ((x).pgd)
 102#define pgprot_val(x)   ((x).pgprot)
 103
 104#define __pgd(x) ((pgd_t) { (x) } )
 105#define __pgprot(x)     ((pgprot_t) { (x) } )
 106
 107#endif /* !__ASSEMBLY__ */
 108
 109/* to align the pointer to the (next) page boundary */
 110#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 111
 112/*
 113 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
 114 *
 115 *      arch/sh/kernel/vmlinux.lds.S
 116 *
 117 * which has the same constant encoded..
 118 */
 119
 120#define __MEMORY_START          CONFIG_MEMORY_START
 121#define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
 122
 123#define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 124#define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 125#define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 126
 127#define MAP_NR(addr)            (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
 128
 129#define phys_to_page(phys)      (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
 130#define page_to_phys(page)      (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
 131
 132/* PFN start number, because of __MEMORY_START */
 133#define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 134#define ARCH_PFN_OFFSET         (PFN_START)
 135#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 136#define pfn_valid(pfn)          (((pfn) - PFN_START) < max_mapnr)
 137#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 138
 139#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 140                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 141
 142#include <asm-generic/memory_model.h>
 143#include <asm-generic/page.h>
 144
 145/* vDSO support */
 146#ifdef CONFIG_VSYSCALL
 147#define __HAVE_ARCH_GATE_AREA
 148#endif
 149
 150#endif /* __KERNEL__ */
 151#endif /* __ASM_SH_PAGE_H */
 152