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 #define PAGE_SHIFT   12
  12
  13 #ifndef __ASSEMBLY__
  14 /* I have my suspicions... -DaveM */
  15 #define PAGE_SIZE    (1UL << PAGE_SHIFT)
  16 #else
  17 #define PAGE_SIZE    (1 << PAGE_SHIFT)
  18 #endif
  19 #define PAGE_MASK    (~(PAGE_SIZE-1))
  20
  21 #include <asm/btfixup.h>
  22
  23 #ifndef __ASSEMBLY__
  24
  25 #define clear_page(page)         memset((void *)(page), 0, PAGE_SIZE)
  26 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  27 #define clear_user_page(addr, vaddr, page)      \
  28         do {    clear_page(addr);               \
  29                 sparc_flush_page_to_ram(page);  \
  30         } while (0)
  31 #define copy_user_page(to, from, vaddr, page)   \
  32         do {    copy_page(to, from);            \
  33                 sparc_flush_page_to_ram(page);  \
  34         } while (0)
  35
  36 /* The following structure is used to hold the physical
  37  * memory configuration of the machine.  This is filled in
  38  * prom_meminit() and is later used by mem_init() to set up
  39  * mem_map[].  We statically allocate SPARC_PHYS_BANKS+1 of
  40  * these structs, this is arbitrary.  The entry after the
  41  * last valid one has num_bytes==0.
  42  */
  43 struct sparc_phys_banks {
  44   unsigned long base_addr;
  45   unsigned long num_bytes;
  46 };
  47
  48 #define SPARC_PHYS_BANKS 32
  49
  50 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  51
  52 /* Cache alias structure.  Entry is valid if context != -1. */
  53 struct cache_palias {
  54         unsigned long vaddr;
  55         int context;
  56 };
  57
  58 /* passing structs on the Sparc slow us down tremendously... */
  59
  60 /* #define STRICT_MM_TYPECHECKS */
  61
  62 #ifdef STRICT_MM_TYPECHECKS
  63 /*
  64  * These are used to make use of C type-checking..
  65  */
  66 typedef struct { unsigned long pte; } pte_t;
  67 typedef struct { unsigned long iopte; } iopte_t;
  68 typedef struct { unsigned long pmdv[16]; } pmd_t;
  69 typedef struct { unsigned long pgd; } pgd_t;
  70 typedef struct { unsigned long ctxd; } ctxd_t;
  71 typedef struct { unsigned long pgprot; } pgprot_t;
  72 typedef struct { unsigned long iopgprot; } iopgprot_t;
  73
  74 #define pte_val(x)      ((x).pte)
  75 #define iopte_val(x)    ((x).iopte)
  76 #define pmd_val(x)      ((x).pmdv[0])
  77 #define pgd_val(x)      ((x).pgd)
  78 #define ctxd_val(x)     ((x).ctxd)
  79 #define pgprot_val(x)   ((x).pgprot)
  80 #define iopgprot_val(x) ((x).iopgprot)
  81
  82 #define __pte(x)        ((pte_t) { (x) } )
  83 #define __iopte(x)      ((iopte_t) { (x) } )
  84 /* #define __pmd(x)        ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
  85 #define __pgd(x)        ((pgd_t) { (x) } )
  86 #define __ctxd(x)       ((ctxd_t) { (x) } )
  87 #define __pgprot(x)     ((pgprot_t) { (x) } )
  88 #define __iopgprot(x)   ((iopgprot_t) { (x) } )
  89
  90 #else
  91 /*
  92  * .. while these make it easier on the compiler
  93  */
  94 typedef unsigned long pte_t;
  95 typedef unsigned long iopte_t;
  96 typedef struct { unsigned long pmdv[16]; } pmd_t;
  97 typedef unsigned long pgd_t;
  98 typedef unsigned long ctxd_t;
  99 typedef unsigned long pgprot_t;
 100 typedef unsigned long iopgprot_t;
 101
 102 #define pte_val(x)      (x)
 103 #define iopte_val(x)    (x)
 104 #define pmd_val(x)      ((x).pmdv[0])
 105 #define pgd_val(x)      (x)
 106 #define ctxd_val(x)     (x)
 107 #define pgprot_val(x)   (x)
 108 #define iopgprot_val(x) (x)
 109
 110 #define __pte(x)        (x)
 111 #define __iopte(x)      (x)
 112 /* #define __pmd(x)        (x) */ /* XXX later */
 113 #define __pgd(x)        (x)
 114 #define __ctxd(x)       (x)
 115 #define __pgprot(x)     (x)
 116 #define __iopgprot(x)   (x)
 117
 118 #endif
 119
 120 typedef struct page *pgtable_t;
 121
 122 extern unsigned long sparc_unmapped_base;
 123
 124 BTFIXUPDEF_SETHI(sparc_unmapped_base)
 125
 126 #define TASK_UNMAPPED_BASE      BTFIXUP_SETHI(sparc_unmapped_base)
 127
 128 #else /* !(__ASSEMBLY__) */
 129
 130 #define __pgprot(x)     (x)
 131
 132 #endif /* !(__ASSEMBLY__) */
 133
 134 #define PAGE_OFFSET     0xf0000000
 135 #ifndef __ASSEMBLY__
 136 extern unsigned long phys_base;
 137 extern unsigned long pfn_base;
 138 #endif
 139 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET + phys_base)
 140 #define __va(x)                 ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
 141
 142 #define virt_to_phys            __pa
 143 #define phys_to_virt            __va
 144
 145 #define ARCH_PFN_OFFSET         (pfn_base)
 146 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 147
 148 #define pfn_valid(pfn)          (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
 149 #define virt_addr_valid(kaddr)  ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
 150
 151 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 152                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 153
 154 #include <asm-generic/memory_model.h>
 155 #include <asm-generic/getorder.h>
 156
 157 #endif /* _SPARC_PAGE_H */