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 /* passing structs on the Sparc slow us down tremendously... */
63 /* #define STRICT_MM_TYPECHECKS */
65 #ifdef STRICT_MM_TYPECHECKS
67 * These are used to make use of C type-checking..
69 typedef struct { unsigned long pte; } pte_t;
70 typedef struct { unsigned long iopte; } iopte_t;
71 typedef struct { unsigned long pmdv[16]; } pmd_t;
72 typedef struct { unsigned long pgd; } pgd_t;
73 typedef struct { unsigned long ctxd; } ctxd_t;
74 typedef struct { unsigned long pgprot; } pgprot_t;
75 typedef struct { unsigned long iopgprot; } iopgprot_t;
77 #define pte_val(x) ((x).pte)
78 #define iopte_val(x) ((x).iopte)
79 #define pmd_val(x) ((x).pmdv[0])
80 #define pgd_val(x) ((x).pgd)
81 #define ctxd_val(x) ((x).ctxd)
82 #define pgprot_val(x) ((x).pgprot)
83 #define iopgprot_val(x) ((x).iopgprot)
85 #define __pte(x) ((pte_t) { (x) } )
86 #define __iopte(x) ((iopte_t) { (x) } )
87 /* #define __pmd(x) ((pmd_t) { (x) } ) */ /* XXX procedure with loop */
88 #define __pgd(x) ((pgd_t) { (x) } )
89 #define __ctxd(x) ((ctxd_t) { (x) } )
90 #define __pgprot(x) ((pgprot_t) { (x) } )
91 #define __iopgprot(x) ((iopgprot_t) { (x) } )
95 * .. while these make it easier on the compiler
97 typedef unsigned long pte_t;
98 typedef unsigned long iopte_t;
99 typedef struct { unsigned long pmdv[16]; } pmd_t;
100 typedef unsigned long pgd_t;
101 typedef unsigned long ctxd_t;
102 typedef unsigned long pgprot_t;
103 typedef unsigned long iopgprot_t;
105 #define pte_val(x) (x)
106 #define iopte_val(x) (x)
107 #define pmd_val(x) ((x).pmdv[0])
108 #define pgd_val(x) (x)
109 #define ctxd_val(x) (x)
110 #define pgprot_val(x) (x)
111 #define iopgprot_val(x) (x)
114 #define __iopte(x) (x)
115 /* #define __pmd(x) (x) */ /* XXX later */
117 #define __ctxd(x) (x)
118 #define __pgprot(x) (x)
119 #define __iopgprot(x) (x)
123 typedef struct page *pgtable_t;
125 extern unsigned long sparc_unmapped_base;
127 BTFIXUPDEF_SETHI(sparc_unmapped_base)
129 #define TASK_UNMAPPED_BASE BTFIXUP_SETHI(sparc_unmapped_base)
131 #else /* !(__ASSEMBLY__) */
133 #define __pgprot(x) (x)
135 #endif /* !(__ASSEMBLY__) */
137 /* to align the pointer to the (next) page boundary */
138 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
140 #define PAGE_OFFSET 0xf0000000
142 extern unsigned long phys_base;
143 extern unsigned long pfn_base;
145 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + phys_base)
146 #define __va(x) ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
148 #define virt_to_phys __pa
149 #define phys_to_virt __va
151 #define ARCH_PFN_OFFSET (pfn_base)
152 #define virt_to_page(kaddr) (mem_map + ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT)))
154 #define pfn_valid(pfn) (((pfn) >= (pfn_base)) && (((pfn)-(pfn_base)) < max_mapnr))
155 #define virt_addr_valid(kaddr) ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
157 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
158 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
160 #include <asm-generic/memory_model.h>
161 #include <asm-generic/page.h>
163 #endif /* _SPARC_PAGE_H */