arch/sparc/include/asm/page_32.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * page.h:  Various defines and such for MMU operations on the Sparc for
   4  *          the Linux kernel.
   5  *
   6  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   7  */
   8
   9 #ifndef _SPARC_PAGE_H
  10 #define _SPARC_PAGE_H
  11
  12 #include <linux/const.h>
  13
  14 #define PAGE_SHIFT   12
  15 #define PAGE_SIZE    (_AC(1, UL) << PAGE_SHIFT)
  16 #define PAGE_MASK    (~(PAGE_SIZE-1))
  17
  18 #ifndef __ASSEMBLY__
  19
  20 #define clear_page(page)         memset((void *)(page), 0, PAGE_SIZE)
  21 #define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
  22 #define clear_user_page(addr, vaddr, page)      \
  23         do {    clear_page(addr);               \
  24                 sparc_flush_page_to_ram(page);  \
  25         } while (0)
  26 #define copy_user_page(to, from, vaddr, page)   \
  27         do {    copy_page(to, from);            \
  28                 sparc_flush_page_to_ram(page);  \
  29         } while (0)
  30
  31 /* The following structure is used to hold the physical
  32  * memory configuration of the machine.  This is filled in
  33  * prom_meminit() and is later used by mem_init() to set up
  34  * mem_map[].  We statically allocate SPARC_PHYS_BANKS+1 of
  35  * these structs, this is arbitrary.  The entry after the
  36  * last valid one has num_bytes==0.
  37  */
  38 struct sparc_phys_banks {
  39   unsigned long base_addr;
  40   unsigned long num_bytes;
  41 };
  42
  43 #define SPARC_PHYS_BANKS 32
  44
  45 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
  46
  47 /* passing structs on the Sparc slow us down tremendously... */
  48
  49 /* #define STRICT_MM_TYPECHECKS */
  50
  51 #ifdef STRICT_MM_TYPECHECKS
  52 /*
  53  * These are used to make use of C type-checking..
  54  */
  55 typedef struct { unsigned long pte; } pte_t;
  56 typedef struct { unsigned long iopte; } iopte_t;
  57 typedef struct { unsigned long pmdv[16]; } pmd_t;
  58 typedef struct { unsigned long pgd; } pgd_t;
  59 typedef struct { unsigned long ctxd; } ctxd_t;
  60 typedef struct { unsigned long pgprot; } pgprot_t;
  61 typedef struct { unsigned long iopgprot; } iopgprot_t;
  62
  63 #define pte_val(x)      ((x).pte)
  64 #define iopte_val(x)    ((x).iopte)
  65 #define pmd_val(x)      ((x).pmdv[0])
  66 #define pgd_val(x)      ((x).pgd)
  67 #define ctxd_val(x)     ((x).ctxd)
  68 #define pgprot_val(x)   ((x).pgprot)
  69 #define iopgprot_val(x) ((x).iopgprot)
  70
  71 #define __pte(x)        ((pte_t) { (x) } )
  72 #define __pmd(x)        ((pmd_t) { { (x) }, })
  73 #define __iopte(x)      ((iopte_t) { (x) } )
  74 #define __pgd(x)        ((pgd_t) { (x) } )
  75 #define __ctxd(x)       ((ctxd_t) { (x) } )
  76 #define __pgprot(x)     ((pgprot_t) { (x) } )
  77 #define __iopgprot(x)   ((iopgprot_t) { (x) } )
  78
  79 #else
  80 /*
  81  * .. while these make it easier on the compiler
  82  */
  83 typedef unsigned long pte_t;
  84 typedef unsigned long iopte_t;
  85 typedef struct { unsigned long pmdv[16]; } pmd_t;
  86 typedef unsigned long pgd_t;
  87 typedef unsigned long ctxd_t;
  88 typedef unsigned long pgprot_t;
  89 typedef unsigned long iopgprot_t;
  90
  91 #define pte_val(x)      (x)
  92 #define iopte_val(x)    (x)
  93 #define pmd_val(x)      ((x).pmdv[0])
  94 #define pgd_val(x)      (x)
  95 #define ctxd_val(x)     (x)
  96 #define pgprot_val(x)   (x)
  97 #define iopgprot_val(x) (x)
  98
  99 #define __pte(x)        (x)
 100 #define __pmd(x)        ((pmd_t) { { (x) }, })
 101 #define __iopte(x)      (x)
 102 #define __pgd(x)        (x)
 103 #define __ctxd(x)       (x)
 104 #define __pgprot(x)     (x)
 105 #define __iopgprot(x)   (x)
 106
 107 #endif
 108
 109 typedef struct page *pgtable_t;
 110
 111 #define TASK_UNMAPPED_BASE      0x50000000
 112
 113 #else /* !(__ASSEMBLY__) */
 114
 115 #define __pgprot(x)     (x)
 116
 117 #endif /* !(__ASSEMBLY__) */
 118
 119 #define PAGE_OFFSET     0xf0000000
 120 #ifndef __ASSEMBLY__
 121 extern unsigned long phys_base;
 122 extern unsigned long pfn_base;
 123 #endif
 124 #define __pa(x)                 ((unsigned long)(x) - PAGE_OFFSET + phys_base)
 125 #define __va(x)                 ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
 126
 127 #define virt_to_phys            __pa
 128 #define phys_to_virt            __va
 129
 130 #define ARCH_PFN_OFFSET         (pfn_base)
 131 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 132
 133 #define pfn_valid(pfn)          (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
 134 #define virt_addr_valid(kaddr)  ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
 135
 136 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 137                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 138
 139 #include <asm-generic/memory_model.h>
 140 #include <asm-generic/getorder.h>
 141
 142 #endif /* _SPARC_PAGE_H */