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 #include <linux/config.h>
  12 #ifdef CONFIG_SUN4
  13 #define PAGE_SHIFT   13
  14 #else
  15 #define PAGE_SHIFT   12
  16 #endif
  17 #ifndef __ASSEMBLY__
  18 /* I have my suspicions... -DaveM */
  19 #define PAGE_SIZE    (1UL << PAGE_SHIFT)
  20 #else
  21 #define PAGE_SIZE    (1 << PAGE_SHIFT)
  22 #endif
  23 #define PAGE_MASK    (~(PAGE_SIZE-1))
  24
  25 #ifdef __KERNEL__
  26
  27 #include <asm/btfixup.h>
  28
  29 #ifndef __ASSEMBLY__
  30
  31 #define clear_page(page)         memset((void *)(page), 0, PAGE_SIZE)
  32 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  33 #define clear_user_page(addr, vaddr, page)      \
  34         do {    clear_page(addr);               \
  35                 sparc_flush_page_to_ram(page);  \
  36         } while (0)
  37 #define copy_user_page(to, from, vaddr, page)   \
  38         do {    copy_page(to, from);            \
  39                 sparc_flush_page_to_ram(page);  \
  40         } while (0)
  41
  42 /* The following structure is used to hold the physical
  43  * memory configuration of the machine.  This is filled in
  44  * probe_memory() and is later used by mem_init() to set up
  45  * mem_map[].  We statically allocate SPARC_PHYS_BANKS of
  46  * these structs, this is arbitrary.  The entry after the
  47  * last valid one has num_bytes==0.
  48  */
  49
  50 struct sparc_phys_banks {
  51   unsigned long base_addr;
  52   unsigned long num_bytes;
  53 };
  54
  55 #define SPARC_PHYS_BANKS 32
  56
  57 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  58
  59 /* Cache alias structure.  Entry is valid if context != -1. */
  60 struct cache_palias {
  61         unsigned long vaddr;
  62         int context;
  63 };
  64
  65 extern struct cache_palias *sparc_aliases;
  66
  67 /* passing structs on the Sparc slow us down tremendously... */
  68
  69 /* #define STRICT_MM_TYPECHECKS */
  70
  71 #ifdef STRICT_MM_TYPECHECKS
  72 /*
  73  * These are used to make use of C type-checking..
  74  */
  75 typedef struct { unsigned long pte; } pte_t;
  76 typedef struct { unsigned long iopte; } iopte_t;
  77 typedef struct { unsigned long pmdv[16]; } pmd_t;
  78 typedef struct { unsigned long pgd; } pgd_t;
  79 typedef struct { unsigned long ctxd; } ctxd_t;
  80 typedef struct { unsigned long pgprot; } pgprot_t;
  81 typedef struct { unsigned long iopgprot; } iopgprot_t;
  82
  83 #define pte_val(x)      ((x).pte)
  84 #define iopte_val(x)    ((x).iopte)
  85 #define pmd_val(x)      ((x).pmdv[0])
  86 #define pgd_val(x)      ((x).pgd)
  87 #define ctxd_val(x)     ((x).ctxd)
  88 #define pgprot_val(x)   ((x).pgprot)
  89 #define iopgprot_val(x) ((x).iopgprot)
  90
  91 #define __pte(x)        ((pte_t) { (x) } )
  92 #define __iopte(x)      ((iopte_t) { (x) } )
  93 /* #define __pmd(x)        ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
  94 #define __pgd(x)        ((pgd_t) { (x) } )
  95 #define __ctxd(x)       ((ctxd_t) { (x) } )
  96 #define __pgprot(x)     ((pgprot_t) { (x) } )
  97 #define __iopgprot(x)   ((iopgprot_t) { (x) } )
  98
  99 #else
 100 /*
 101  * .. while these make it easier on the compiler
 102  */
 103 typedef unsigned long pte_t;
 104 typedef unsigned long iopte_t;
 105 typedef struct { unsigned long pmdv[16]; } pmd_t;
 106 typedef unsigned long pgd_t;
 107 typedef unsigned long ctxd_t;
 108 typedef unsigned long pgprot_t;
 109 typedef unsigned long iopgprot_t;
 110
 111 #define pte_val(x)      (x)
 112 #define iopte_val(x)    (x)
 113 #define pmd_val(x)      ((x).pmdv[0])
 114 #define pgd_val(x)      (x)
 115 #define ctxd_val(x)     (x)
 116 #define pgprot_val(x)   (x)
 117 #define iopgprot_val(x) (x)
 118
 119 #define __pte(x)        (x)
 120 #define __iopte(x)      (x)
 121 /* #define __pmd(x)        (x) */ /* XXX later */
 122 #define __pgd(x)        (x)
 123 #define __ctxd(x)       (x)
 124 #define __pgprot(x)     (x)
 125 #define __iopgprot(x)   (x)
 126
 127 #endif
 128
 129 extern unsigned long sparc_unmapped_base;
 130
 131 BTFIXUPDEF_SETHI(sparc_unmapped_base)
 132
 133 #define TASK_UNMAPPED_BASE      BTFIXUP_SETHI(sparc_unmapped_base)
 134
 135 /* Pure 2^n version of get_order */
 136 extern __inline__ int get_order(unsigned long size)
 137 {
 138         int order;
 139
 140         size = (size-1) >> (PAGE_SHIFT-1);
 141         order = -1;
 142         do {
 143                 size >>= 1;
 144                 order++;
 145         } while (size);
 146         return order;
 147 }
 148
 149 #else /* !(__ASSEMBLY__) */
 150
 151 #define __pgprot(x)     (x)
 152
 153 #endif /* !(__ASSEMBLY__) */
 154
 155 /* to align the pointer to the (next) page boundary */
 156 #define PAGE_ALIGN(addr)  (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 157
 158 #define PAGE_OFFSET     0xf0000000
 159 #ifndef __ASSEMBLY__
 160 extern unsigned long phys_base;
 161 extern unsigned long pfn_base;
 162 #endif
 163 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET + phys_base)
 164 #define __va(x)                 ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
 165
 166 #define virt_to_phys            __pa
 167 #define phys_to_virt            __va
 168
 169 #define pfn_to_page(pfn)        (mem_map + ((pfn)-(pfn_base)))
 170 #define page_to_pfn(page)       ((unsigned long)(((page) - mem_map) + pfn_base))
 171 #define virt_to_page(kaddr)     (mem_map + ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT)))
 172
 173 #define pfn_valid(pfn)          (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
 174 #define virt_addr_valid(kaddr)  ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
 175
 176 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 177                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 178
 179 #endif /* __KERNEL__ */
 180
 181 #endif /* _SPARC_PAGE_H */