include/asm-sparc/page.h

   1 /* $Id: page.h,v 1.48 2000/02/16 07:34:51 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 #define PAGE_SIZE    (1 << PAGE_SHIFT)
  18 #define PAGE_MASK    (~(PAGE_SIZE-1))
  19
  20 #ifdef __KERNEL__
  21
  22 #include <asm/head.h>       /* for KERNBASE */
  23 #include <asm/btfixup.h>
  24
  25 /* This is always 2048*sizeof(long), doesn't change with PAGE_SIZE */
  26 #define TASK_UNION_SIZE         8192
  27
  28 #ifndef __ASSEMBLY__
  29
  30 #define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; } while (0)
  31
  32 #define PAGE_BUG(page) do { \
  33         BUG(); \
  34 } while (0)
  35
  36 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  37 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  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];
  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 pmd; } 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).pmd)
  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) } )
  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 unsigned long 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)
 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)
 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 extern unsigned long sparc_unmapped_base;
 127
 128 BTFIXUPDEF_SETHI(sparc_unmapped_base)
 129
 130 #define TASK_UNMAPPED_BASE      BTFIXUP_SETHI(sparc_unmapped_base)
 131
 132 /* Pure 2^n version of get_order */
 133 extern __inline__ int get_order(unsigned long size)
 134 {
 135         int order;
 136
 137         size = (size-1) >> (PAGE_SHIFT-1);
 138         order = -1;
 139         do {
 140                 size >>= 1;
 141                 order++;
 142         } while (size);
 143         return order;
 144 }
 145
 146 #else /* !(__ASSEMBLY__) */
 147
 148 #define __pgprot(x)     (x)
 149
 150 #endif /* !(__ASSEMBLY__) */
 151
 152 /* to align the pointer to the (next) page boundary */
 153 #define PAGE_ALIGN(addr)  (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 154
 155 #define PAGE_OFFSET     0xf0000000
 156 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET)
 157 #define __va(x)                 ((void *)((unsigned long) (x) + PAGE_OFFSET))
 158 #define MAP_NR(addr)            (__pa(addr) >> PAGE_SHIFT)
 159
 160 #endif /* __KERNEL__ */
 161
 162 #endif /* _SPARC_PAGE_H */