LXR linux/arch/sparc/include/asm/page

   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 */
  43struct sparc_phys_banks {
  44  unsigned long base_addr;
  45  unsigned long num_bytes;
  46};
  47
  48#define SPARC_PHYS_BANKS 32
  49
  50extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  51
  52/* Cache alias structure.  Entry is valid if context != -1. */
  53struct 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 */
  66typedef struct { unsigned long pte; } pte_t;
  67typedef struct { unsigned long iopte; } iopte_t;
  68typedef struct { unsigned long pmdv[16]; } pmd_t;
  69typedef struct { unsigned long pgd; } pgd_t;
  70typedef struct { unsigned long ctxd; } ctxd_t;
  71typedef struct { unsigned long pgprot; } pgprot_t;
  72typedef 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 */
  94typedef unsigned long pte_t;
  95typedef unsigned long iopte_t;
  96typedef struct { unsigned long pmdv[16]; } pmd_t;
  97typedef unsigned long pgd_t;
  98typedef unsigned long ctxd_t;
  99typedef unsigned long pgprot_t;
 100typedef 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
 120typedef struct page *pgtable_t;
 121
 122extern unsigned long sparc_unmapped_base;
 123
 124BTFIXUPDEF_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__
 136extern unsigned long phys_base;
 137extern 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 */
 158