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Linux/arch/sparc/include/asm/page_32.h

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  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 */
143 

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