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/head.h>       /* for KERNBASE */
  28 #include <asm/btfixup.h>
  29
  30 /* This is always 2048*sizeof(long), doesn't change with PAGE_SIZE */
  31 #define TASK_UNION_SIZE         8192
  32
  33 #ifndef __ASSEMBLY__
  34
  35 /*
  36  * XXX I am hitting compiler bugs with __builtin_trap. This has
  37  * hit me before and rusty was blaming his netfilter bugs on
  38  * this so lets disable it. - Anton
  39  */
  40 #if 0
  41 /* We need the mb()'s so we don't trigger a compiler bug - Anton */
  42 #define BUG() do { \
  43         mb(); \
  44         __builtin_trap(); \
  45         mb(); \
  46 } while(0)
  47 #else
  48 #define BUG() do { \
  49         printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; \
  50 } while (0)
  51 #endif
  52
  53 #define PAGE_BUG(page)  BUG()
  54
  55 #define clear_page(page)         memset((void *)(page), 0, PAGE_SIZE)
  56 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  57 #define clear_user_page(page, vaddr)    clear_page(page)
  58 #define copy_user_page(to, from, vaddr) copy_page(to, from)
  59
  60 /* The following structure is used to hold the physical
  61  * memory configuration of the machine.  This is filled in
  62  * probe_memory() and is later used by mem_init() to set up
  63  * mem_map[].  We statically allocate SPARC_PHYS_BANKS of
  64  * these structs, this is arbitrary.  The entry after the
  65  * last valid one has num_bytes==0.
  66  */
  67
  68 struct sparc_phys_banks {
  69   unsigned long base_addr;
  70   unsigned long num_bytes;
  71 };
  72
  73 #define SPARC_PHYS_BANKS 32
  74
  75 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];
  76
  77 /* Cache alias structure.  Entry is valid if context != -1. */
  78 struct cache_palias {
  79         unsigned long vaddr;
  80         int context;
  81 };
  82
  83 extern struct cache_palias *sparc_aliases;
  84
  85 /* passing structs on the Sparc slow us down tremendously... */
  86
  87 /* #define STRICT_MM_TYPECHECKS */
  88
  89 #ifdef STRICT_MM_TYPECHECKS
  90 /*
  91  * These are used to make use of C type-checking..
  92  */
  93 typedef struct { unsigned long pte; } pte_t;
  94 typedef struct { unsigned long iopte; } iopte_t;
  95 typedef struct { unsigned long pmd; } pmd_t;
  96 typedef struct { unsigned long pgd; } pgd_t;
  97 typedef struct { unsigned long ctxd; } ctxd_t;
  98 typedef struct { unsigned long pgprot; } pgprot_t;
  99 typedef struct { unsigned long iopgprot; } iopgprot_t;
 100
 101 #define pte_val(x)      ((x).pte)
 102 #define iopte_val(x)    ((x).iopte)
 103 #define pmd_val(x)      ((x).pmd)
 104 #define pgd_val(x)      ((x).pgd)
 105 #define ctxd_val(x)     ((x).ctxd)
 106 #define pgprot_val(x)   ((x).pgprot)
 107 #define iopgprot_val(x) ((x).iopgprot)
 108
 109 #define __pte(x)        ((pte_t) { (x) } )
 110 #define __iopte(x)      ((iopte_t) { (x) } )
 111 #define __pmd(x)        ((pmd_t) { (x) } )
 112 #define __pgd(x)        ((pgd_t) { (x) } )
 113 #define __ctxd(x)       ((ctxd_t) { (x) } )
 114 #define __pgprot(x)     ((pgprot_t) { (x) } )
 115 #define __iopgprot(x)   ((iopgprot_t) { (x) } )
 116
 117 #else
 118 /*
 119  * .. while these make it easier on the compiler
 120  */
 121 typedef unsigned long pte_t;
 122 typedef unsigned long iopte_t;
 123 typedef unsigned long pmd_t;
 124 typedef unsigned long pgd_t;
 125 typedef unsigned long ctxd_t;
 126 typedef unsigned long pgprot_t;
 127 typedef unsigned long iopgprot_t;
 128
 129 #define pte_val(x)      (x)
 130 #define iopte_val(x)    (x)
 131 #define pmd_val(x)      (x)
 132 #define pgd_val(x)      (x)
 133 #define ctxd_val(x)     (x)
 134 #define pgprot_val(x)   (x)
 135 #define iopgprot_val(x) (x)
 136
 137 #define __pte(x)        (x)
 138 #define __iopte(x)      (x)
 139 #define __pmd(x)        (x)
 140 #define __pgd(x)        (x)
 141 #define __ctxd(x)       (x)
 142 #define __pgprot(x)     (x)
 143 #define __iopgprot(x)   (x)
 144
 145 #endif
 146
 147 extern unsigned long sparc_unmapped_base;
 148
 149 BTFIXUPDEF_SETHI(sparc_unmapped_base)
 150
 151 #define TASK_UNMAPPED_BASE      BTFIXUP_SETHI(sparc_unmapped_base)
 152
 153 /* Pure 2^n version of get_order */
 154 extern __inline__ int get_order(unsigned long size)
 155 {
 156         int order;
 157
 158         size = (size-1) >> (PAGE_SHIFT-1);
 159         order = -1;
 160         do {
 161                 size >>= 1;
 162                 order++;
 163         } while (size);
 164         return order;
 165 }
 166
 167 #else /* !(__ASSEMBLY__) */
 168
 169 #define __pgprot(x)     (x)
 170
 171 #endif /* !(__ASSEMBLY__) */
 172
 173 /* to align the pointer to the (next) page boundary */
 174 #define PAGE_ALIGN(addr)  (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 175
 176 #define PAGE_OFFSET     0xf0000000
 177 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
 178 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 179 #define virt_to_page(kaddr)     (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
 180 #define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
 181
 182 #endif /* __KERNEL__ */
 183
 184 #endif /* _SPARC_PAGE_H */