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2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
18 * PAGE_SHIFT determines the page size
20 #ifdef CONFIG_PAGE_SIZE_4KB
23 #ifdef CONFIG_PAGE_SIZE_8KB
26 #ifdef CONFIG_PAGE_SIZE_16KB
29 #ifdef CONFIG_PAGE_SIZE_64KB
32 #define PAGE_SIZE (1UL << PAGE_SHIFT)
33 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
37 #include <linux/pfn.h>
41 * It's normally defined only for FLATMEM config but it's
42 * used in our early mem init code for all memory models.
43 * So always define it.
45 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
47 extern void clear_page(void * page
);
48 extern void copy_page(void * to
, void * from
);
50 extern unsigned long shm_align_mask
;
52 static inline unsigned long pages_do_alias(unsigned long addr1
,
55 return (addr1
^ addr2
) & shm_align_mask
;
60 static inline void clear_user_page(void *addr
, unsigned long vaddr
,
63 extern void (*flush_data_cache_page
)(unsigned long addr
);
66 if (pages_do_alias((unsigned long) addr
, vaddr
& PAGE_MASK
))
67 flush_data_cache_page((unsigned long)addr
);
70 extern void copy_user_page(void *vto
, void *vfrom
, unsigned long vaddr
,
72 struct vm_area_struct
;
73 extern void copy_user_highpage(struct page
*to
, struct page
*from
,
74 unsigned long vaddr
, struct vm_area_struct
*vma
);
76 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
79 * These are used to make use of C type-checking..
81 #ifdef CONFIG_64BIT_PHYS_ADDR
82 #ifdef CONFIG_CPU_MIPS32
83 typedef struct { unsigned long pte_low
, pte_high
; } pte_t
;
84 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
85 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
87 typedef struct { unsigned long long pte
; } pte_t
;
88 #define pte_val(x) ((x).pte)
89 #define __pte(x) ((pte_t) { (x) } )
92 typedef struct { unsigned long pte
; } pte_t
;
93 #define pte_val(x) ((x).pte)
94 #define __pte(x) ((pte_t) { (x) } )
98 * For 3-level pagetables we defines these ourselves, for 2-level the
99 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
103 typedef struct { unsigned long pmd
; } pmd_t
;
104 #define pmd_val(x) ((x).pmd)
105 #define __pmd(x) ((pmd_t) { (x) } )
110 * Right now we don't support 4-level pagetables, so all pud-related
111 * definitions come from <asm-generic/pgtable-nopud.h>.
115 * Finall the top of the hierarchy, the pgd
117 typedef struct { unsigned long pgd
; } pgd_t
;
118 #define pgd_val(x) ((x).pgd)
119 #define __pgd(x) ((pgd_t) { (x) } )
122 * Manipulate page protection bits
124 typedef struct { unsigned long pgprot
; } pgprot_t
;
125 #define pgprot_val(x) ((x).pgprot)
126 #define __pgprot(x) ((pgprot_t) { (x) } )
129 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
130 * pair of pages we only have a single global bit per pair of pages. When
131 * writing to the TLB make sure we always have the bit set for both pages
132 * or none. This macro is used to access the `buddy' of the pte we're just
135 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
137 #endif /* !__ASSEMBLY__ */
139 /* to align the pointer to the (next) page boundary */
140 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
143 * __pa()/__va() should be used only during mem init.
145 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
148 unsigned long __x = (unsigned long)(x); \
149 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \
153 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
155 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
156 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
158 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
160 #ifdef CONFIG_FLATMEM
162 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
164 #elif defined(CONFIG_SPARSEMEM)
166 /* pfn_valid is defined in linux/mmzone.h */
168 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
170 #define pfn_valid(pfn) \
172 unsigned long __pfn = (pfn); \
173 int __n = pfn_to_nid(__pfn); \
174 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
175 NODE_DATA(__n)->node_spanned_pages) \
181 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
182 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
184 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
185 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
187 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
188 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
190 #include <asm-generic/memory_model.h>
191 #include <asm-generic/page.h>
193 #endif /* defined (__KERNEL__) */
195 #endif /* _ASM_PAGE_H */