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.
15 * PAGE_SHIFT determines the page size
17 #ifdef CONFIG_PAGE_SIZE_4KB
20 #ifdef CONFIG_PAGE_SIZE_8KB
23 #ifdef CONFIG_PAGE_SIZE_16KB
26 #ifdef CONFIG_PAGE_SIZE_64KB
29 #define PAGE_SIZE (1UL << PAGE_SHIFT)
30 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
34 #include <linux/pfn.h>
37 extern void build_clear_page(void);
38 extern void build_copy_page(void);
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) } )
96 typedef struct page *pgtable_t;
99 * For 3-level pagetables we defines these ourselves, for 2-level the
100 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
104 typedef struct { unsigned long pmd; } pmd_t;
105 #define pmd_val(x) ((x).pmd)
106 #define __pmd(x) ((pmd_t) { (x) } )
111 * Right now we don't support 4-level pagetables, so all pud-related
112 * definitions come from <asm-generic/pgtable-nopud.h>.
116 * Finall the top of the hierarchy, the pgd
118 typedef struct { unsigned long pgd; } pgd_t;
119 #define pgd_val(x) ((x).pgd)
120 #define __pgd(x) ((pgd_t) { (x) } )
123 * Manipulate page protection bits
125 typedef struct { unsigned long pgprot; } pgprot_t;
126 #define pgprot_val(x) ((x).pgprot)
127 #define __pgprot(x) ((pgprot_t) { (x) } )
130 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
131 * pair of pages we only have a single global bit per pair of pages. When
132 * writing to the TLB make sure we always have the bit set for both pages
133 * or none. This macro is used to access the `buddy' of the pte we're just
136 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
138 #endif /* !__ASSEMBLY__ */
141 * __pa()/__va() should be used only during mem init.
146 unsigned long __x = (unsigned long)(x); \
147 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \
151 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
153 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
154 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
156 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
158 #ifdef CONFIG_FLATMEM
160 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
162 #elif defined(CONFIG_SPARSEMEM)
164 /* pfn_valid is defined in linux/mmzone.h */
166 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
168 #define pfn_valid(pfn) \
170 unsigned long __pfn = (pfn); \
171 int __n = pfn_to_nid(__pfn); \
172 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
173 NODE_DATA(__n)->node_spanned_pages) \
179 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
180 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
182 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
183 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
185 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
186 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
188 #include <asm-generic/memory_model.h>
189 #include <asm-generic/page.h>
191 #endif /* _ASM_PAGE_H */