2 * page.h: Various defines and such for MMU operations on the Sparc for
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
17 /* I have my suspicions... -DaveM */
18 #define PAGE_SIZE (1UL << PAGE_SHIFT)
20 #define PAGE_SIZE (1 << PAGE_SHIFT)
22 #define PAGE_MASK (~(PAGE_SIZE-1))
24 #include <asm/btfixup.h>
28 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
29 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
30 #define clear_user_page(addr, vaddr, page) \
31 do { clear_page(addr); \
32 sparc_flush_page_to_ram(page); \
34 #define copy_user_page(to, from, vaddr, page) \
35 do { copy_page(to, from); \
36 sparc_flush_page_to_ram(page); \
39 /* The following structure is used to hold the physical
40 * memory configuration of the machine. This is filled in
41 * prom_meminit() and is later used by mem_init() to set up
42 * mem_map[]. We statically allocate SPARC_PHYS_BANKS+1 of
43 * these structs, this is arbitrary. The entry after the
44 * last valid one has num_bytes==0.
46 struct sparc_phys_banks {
47 unsigned long base_addr;
48 unsigned long num_bytes;
51 #define SPARC_PHYS_BANKS 32
53 extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
55 /* Cache alias structure. Entry is valid if context != -1. */
61 extern struct cache_palias *sparc_aliases;
63 /* passing structs on the Sparc slow us down tremendously... */
65 /* #define STRICT_MM_TYPECHECKS */
67 #ifdef STRICT_MM_TYPECHECKS
69 * These are used to make use of C type-checking..
71 typedef struct { unsigned long pte; } pte_t;
72 typedef struct { unsigned long iopte; } iopte_t;
73 typedef struct { unsigned long pmdv[16]; } pmd_t;
74 typedef struct { unsigned long pgd; } pgd_t;
75 typedef struct { unsigned long ctxd; } ctxd_t;
76 typedef struct { unsigned long pgprot; } pgprot_t;
77 typedef struct { unsigned long iopgprot; } iopgprot_t;
79 #define pte_val(x) ((x).pte)
80 #define iopte_val(x) ((x).iopte)
81 #define pmd_val(x) ((x).pmdv[0])
82 #define pgd_val(x) ((x).pgd)
83 #define ctxd_val(x) ((x).ctxd)
84 #define pgprot_val(x) ((x).pgprot)
85 #define iopgprot_val(x) ((x).iopgprot)
87 #define __pte(x) ((pte_t) { (x) } )
88 #define __iopte(x) ((iopte_t) { (x) } )
89 /* #define __pmd(x) ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
90 #define __pgd(x) ((pgd_t) { (x) } )
91 #define __ctxd(x) ((ctxd_t) { (x) } )
92 #define __pgprot(x) ((pgprot_t) { (x) } )
93 #define __iopgprot(x) ((iopgprot_t) { (x) } )
97 * .. while these make it easier on the compiler
99 typedef unsigned long pte_t;
100 typedef unsigned long iopte_t;
101 typedef struct { unsigned long pmdv[16]; } pmd_t;
102 typedef unsigned long pgd_t;
103 typedef unsigned long ctxd_t;
104 typedef unsigned long pgprot_t;
105 typedef unsigned long iopgprot_t;
107 #define pte_val(x) (x)
108 #define iopte_val(x) (x)
109 #define pmd_val(x) ((x).pmdv[0])
110 #define pgd_val(x) (x)
111 #define ctxd_val(x) (x)
112 #define pgprot_val(x) (x)
113 #define iopgprot_val(x) (x)
116 #define __iopte(x) (x)
117 /* #define __pmd(x) (x) */ /* XXX later */
119 #define __ctxd(x) (x)
120 #define __pgprot(x) (x)
121 #define __iopgprot(x) (x)
125 typedef struct page *pgtable_t;
127 extern unsigned long sparc_unmapped_base;
129 BTFIXUPDEF_SETHI(sparc_unmapped_base)
131 #define TASK_UNMAPPED_BASE BTFIXUP_SETHI(sparc_unmapped_base)
133 #else /* !(__ASSEMBLY__) */
135 #define __pgprot(x) (x)
137 #endif /* !(__ASSEMBLY__) */
139 /* to align the pointer to the (next) page boundary */
140 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
142 #define PAGE_OFFSET 0xf0000000
144 extern unsigned long phys_base;
145 extern unsigned long pfn_base;
147 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + phys_base)
148 #define __va(x) ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
150 #define virt_to_phys __pa
151 #define phys_to_virt __va
153 #define ARCH_PFN_OFFSET (pfn_base)
154 #define virt_to_page(kaddr) (mem_map + ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT)))
156 #define pfn_valid(pfn) (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
157 #define virt_addr_valid(kaddr) ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
159 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
160 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
162 #include <asm-generic/memory_model.h>
163 #include <asm-generic/page.h>
165 #endif /* _SPARC_PAGE_H */