include/asm-sparc/page.h

   1 /* $Id: page.h,v 1.55 2000/10/30 21:01:41 davem Exp $
   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 #ifdef CONFIG_SUN4
  12 #define PAGE_SHIFT   13
  13 #else
  14 #define PAGE_SHIFT   12
  15 #endif
  16 #ifndef __ASSEMBLY__
  17 /* I have my suspicions... -DaveM */
  18 #define PAGE_SIZE    (1UL << PAGE_SHIFT)
  19 #else
  20 #define PAGE_SIZE    (1 << PAGE_SHIFT)
  21 #endif
  22 #define PAGE_MASK    (~(PAGE_SIZE-1))
  23
  24 #include <asm/btfixup.h>
  25
  26 #ifndef __ASSEMBLY__
  27
  28 #define clear_page(page)         memset((void *)(page), 0, PAGE_SIZE)
  29 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  30 #define clear_user_page(addr, vaddr, page)      \
  31         do {    clear_page(addr);               \
  32                 sparc_flush_page_to_ram(page);  \
  33         } while (0)
  34 #define copy_user_page(to, from, vaddr, page)   \
  35         do {    copy_page(to, from);            \
  36                 sparc_flush_page_to_ram(page);  \
  37         } while (0)
  38
  39 /* The following structure is used to hold the physical
  40  * memory configuration of the machine.  This is filled in
  41  * probe_memory() and is later used by mem_init() to set up
  42  * mem_map[].  We statically allocate SPARC_PHYS_BANKS of
  43  * these structs, this is arbitrary.  The entry after the
  44  * last valid one has num_bytes==0.
  45  */
  46
  47 struct sparc_phys_banks {
  48   unsigned long base_addr;
  49   unsigned long num_bytes;
  50 };
  51
  52 #define SPARC_PHYS_BANKS 32
  53
  54 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  55
  56 /* Cache alias structure.  Entry is valid if context != -1. */
  57 struct cache_palias {
  58         unsigned long vaddr;
  59         int context;
  60 };
  61
  62 extern struct cache_palias *sparc_aliases;
  63
  64 /* passing structs on the Sparc slow us down tremendously... */
  65
  66 /* #define STRICT_MM_TYPECHECKS */
  67
  68 #ifdef STRICT_MM_TYPECHECKS
  69 /*
  70  * These are used to make use of C type-checking..
  71  */
  72 typedef struct { unsigned long pte; } pte_t;
  73 typedef struct { unsigned long iopte; } iopte_t;
  74 typedef struct { unsigned long pmdv[16]; } pmd_t;
  75 typedef struct { unsigned long pgd; } pgd_t;
  76 typedef struct { unsigned long ctxd; } ctxd_t;
  77 typedef struct { unsigned long pgprot; } pgprot_t;
  78 typedef struct { unsigned long iopgprot; } iopgprot_t;
  79
  80 #define pte_val(x)      ((x).pte)
  81 #define iopte_val(x)    ((x).iopte)
  82 #define pmd_val(x)      ((x).pmdv[0])
  83 #define pgd_val(x)      ((x).pgd)
  84 #define ctxd_val(x)     ((x).ctxd)
  85 #define pgprot_val(x)   ((x).pgprot)
  86 #define iopgprot_val(x) ((x).iopgprot)
  87
  88 #define __pte(x)        ((pte_t) { (x) } )
  89 #define __iopte(x)      ((iopte_t) { (x) } )
  90 /* #define __pmd(x)        ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
  91 #define __pgd(x)        ((pgd_t) { (x) } )
  92 #define __ctxd(x)       ((ctxd_t) { (x) } )
  93 #define __pgprot(x)     ((pgprot_t) { (x) } )
  94 #define __iopgprot(x)   ((iopgprot_t) { (x) } )
  95
  96 #else
  97 /*
  98  * .. while these make it easier on the compiler
  99  */
 100 typedef unsigned long pte_t;
 101 typedef unsigned long iopte_t;
 102 typedef struct { unsigned long pmdv[16]; } pmd_t;
 103 typedef unsigned long pgd_t;
 104 typedef unsigned long ctxd_t;
 105 typedef unsigned long pgprot_t;
 106 typedef unsigned long iopgprot_t;
 107
 108 #define pte_val(x)      (x)
 109 #define iopte_val(x)    (x)
 110 #define pmd_val(x)      ((x).pmdv[0])
 111 #define pgd_val(x)      (x)
 112 #define ctxd_val(x)     (x)
 113 #define pgprot_val(x)   (x)
 114 #define iopgprot_val(x) (x)
 115
 116 #define __pte(x)        (x)
 117 #define __iopte(x)      (x)
 118 /* #define __pmd(x)        (x) */ /* XXX later */
 119 #define __pgd(x)        (x)
 120 #define __ctxd(x)       (x)
 121 #define __pgprot(x)     (x)
 122 #define __iopgprot(x)   (x)
 123
 124 #endif
 125
 126 typedef struct page *pgtable_t;
 127
 128 extern unsigned long sparc_unmapped_base;
 129
 130 BTFIXUPDEF_SETHI(sparc_unmapped_base)
 131
 132 #define TASK_UNMAPPED_BASE      BTFIXUP_SETHI(sparc_unmapped_base)
 133
 134 #else /* !(__ASSEMBLY__) */
 135
 136 #define __pgprot(x)     (x)
 137
 138 #endif /* !(__ASSEMBLY__) */
 139
 140 /* to align the pointer to the (next) page boundary */
 141 #define PAGE_ALIGN(addr)  (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 142
 143 #define PAGE_OFFSET     0xf0000000
 144 #ifndef __ASSEMBLY__
 145 extern unsigned long phys_base;
 146 extern unsigned long pfn_base;
 147 #endif
 148 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET + phys_base)
 149 #define __va(x)                 ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
 150
 151 #define virt_to_phys            __pa
 152 #define phys_to_virt            __va
 153
 154 #define ARCH_PFN_OFFSET         (pfn_base)
 155 #define virt_to_page(kaddr)     (mem_map + ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT)))
 156
 157 #define pfn_valid(pfn)          (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
 158 #define virt_addr_valid(kaddr)  ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
 159
 160 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 161                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 162
 163 #include <asm-generic/memory_model.h>
 164 #include <asm-generic/page.h>
 165
 166 #endif /* _SPARC_PAGE_H */