arch/sparc/include/asm/page_32.h

   1 /*
   2  * page.h:  Various defines and such for MMU operations on the Sparc for
   3  *          the Linux kernel.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #ifndef _SPARC_PAGE_H
   9 #define _SPARC_PAGE_H
  10
  11 #include <linux/const.h>
  12
  13 #define PAGE_SHIFT   12
  14 #define PAGE_SIZE    (_AC(1, UL) << PAGE_SHIFT)
  15 #define PAGE_MASK    (~(PAGE_SIZE-1))
  16
  17 #include <asm/btfixup.h>
  18
  19 #ifndef __ASSEMBLY__
  20
  21 #define clear_page(page)         memset((void *)(page), 0, PAGE_SIZE)
  22 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  23 #define clear_user_page(addr, vaddr, page)      \
  24         do {    clear_page(addr);               \
  25                 sparc_flush_page_to_ram(page);  \
  26         } while (0)
  27 #define copy_user_page(to, from, vaddr, page)   \
  28         do {    copy_page(to, from);            \
  29                 sparc_flush_page_to_ram(page);  \
  30         } while (0)
  31
  32 /* The following structure is used to hold the physical
  33  * memory configuration of the machine.  This is filled in
  34  * prom_meminit() and is later used by mem_init() to set up
  35  * mem_map[].  We statically allocate SPARC_PHYS_BANKS+1 of
  36  * these structs, this is arbitrary.  The entry after the
  37  * last valid one has num_bytes==0.
  38  */
  39 struct sparc_phys_banks {
  40   unsigned long base_addr;
  41   unsigned long num_bytes;
  42 };
  43
  44 #define SPARC_PHYS_BANKS 32
  45
  46 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  47
  48 /* Cache alias structure.  Entry is valid if context != -1. */
  49 struct cache_palias {
  50         unsigned long vaddr;
  51         int context;
  52 };
  53
  54 /* passing structs on the Sparc slow us down tremendously... */
  55
  56 /* #define STRICT_MM_TYPECHECKS */
  57
  58 #ifdef STRICT_MM_TYPECHECKS
  59 /*
  60  * These are used to make use of C type-checking..
  61  */
  62 typedef struct { unsigned long pte; } pte_t;
  63 typedef struct { unsigned long iopte; } iopte_t;
  64 typedef struct { unsigned long pmdv[16]; } pmd_t;
  65 typedef struct { unsigned long pgd; } pgd_t;
  66 typedef struct { unsigned long ctxd; } ctxd_t;
  67 typedef struct { unsigned long pgprot; } pgprot_t;
  68 typedef struct { unsigned long iopgprot; } iopgprot_t;
  69
  70 #define pte_val(x)      ((x).pte)
  71 #define iopte_val(x)    ((x).iopte)
  72 #define pmd_val(x)      ((x).pmdv[0])
  73 #define pgd_val(x)      ((x).pgd)
  74 #define ctxd_val(x)     ((x).ctxd)
  75 #define pgprot_val(x)   ((x).pgprot)
  76 #define iopgprot_val(x) ((x).iopgprot)
  77
  78 #define __pte(x)        ((pte_t) { (x) } )
  79 #define __iopte(x)      ((iopte_t) { (x) } )
  80 /* #define __pmd(x)        ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
  81 #define __pgd(x)        ((pgd_t) { (x) } )
  82 #define __ctxd(x)       ((ctxd_t) { (x) } )
  83 #define __pgprot(x)     ((pgprot_t) { (x) } )
  84 #define __iopgprot(x)   ((iopgprot_t) { (x) } )
  85
  86 #else
  87 /*
  88  * .. while these make it easier on the compiler
  89  */
  90 typedef unsigned long pte_t;
  91 typedef unsigned long iopte_t;
  92 typedef struct { unsigned long pmdv[16]; } pmd_t;
  93 typedef unsigned long pgd_t;
  94 typedef unsigned long ctxd_t;
  95 typedef unsigned long pgprot_t;
  96 typedef unsigned long iopgprot_t;
  97
  98 #define pte_val(x)      (x)
  99 #define iopte_val(x)    (x)
 100 #define pmd_val(x)      ((x).pmdv[0])
 101 #define pgd_val(x)      (x)
 102 #define ctxd_val(x)     (x)
 103 #define pgprot_val(x)   (x)
 104 #define iopgprot_val(x) (x)
 105
 106 #define __pte(x)        (x)
 107 #define __iopte(x)      (x)
 108 /* #define __pmd(x)        (x) */ /* XXX later */
 109 #define __pgd(x)        (x)
 110 #define __ctxd(x)       (x)
 111 #define __pgprot(x)     (x)
 112 #define __iopgprot(x)   (x)
 113
 114 #endif
 115
 116 typedef struct page *pgtable_t;
 117
 118 extern unsigned long sparc_unmapped_base;
 119
 120 BTFIXUPDEF_SETHI(sparc_unmapped_base)
 121
 122 #define TASK_UNMAPPED_BASE      BTFIXUP_SETHI(sparc_unmapped_base)
 123
 124 #else /* !(__ASSEMBLY__) */
 125
 126 #define __pgprot(x)     (x)
 127
 128 #endif /* !(__ASSEMBLY__) */
 129
 130 #define PAGE_OFFSET     0xf0000000
 131 #ifndef __ASSEMBLY__
 132 extern unsigned long phys_base;
 133 extern unsigned long pfn_base;
 134 #endif
 135 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET + phys_base)
 136 #define __va(x)                 ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
 137
 138 #define virt_to_phys            __pa
 139 #define phys_to_virt            __va
 140
 141 #define ARCH_PFN_OFFSET         (pfn_base)
 142 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 143
 144 #define pfn_valid(pfn)          (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
 145 #define virt_addr_valid(kaddr)  ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
 146
 147 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 148                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 149
 150 #include <asm-generic/memory_model.h>
 151 #include <asm-generic/getorder.h>
 152
 153 #endif /* _SPARC_PAGE_H */