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>
38 * It's normally defined only for FLATMEM config but it's
39 * used in our early mem init code for all memory models.
40 * So always define it.
42 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
44 extern void clear_page(void * page);
45 extern void copy_page(void * to, void * from);
47 extern unsigned long shm_align_mask;
49 static inline unsigned long pages_do_alias(unsigned long addr1,
52 return (addr1 ^ addr2) & shm_align_mask;
57 static inline void clear_user_page(void *addr, unsigned long vaddr,
60 extern void (*flush_data_cache_page)(unsigned long addr);
63 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
64 flush_data_cache_page((unsigned long)addr);
67 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
69 struct vm_area_struct;
70 extern void copy_user_highpage(struct page *to, struct page *from,
71 unsigned long vaddr, struct vm_area_struct *vma);
73 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
76 * These are used to make use of C type-checking..
78 #ifdef CONFIG_64BIT_PHYS_ADDR
79 #ifdef CONFIG_CPU_MIPS32
80 typedef struct { unsigned long pte_low, pte_high; } pte_t;
81 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
82 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
84 typedef struct { unsigned long long pte; } pte_t;
85 #define pte_val(x) ((x).pte)
86 #define __pte(x) ((pte_t) { (x) } )
89 typedef struct { unsigned long pte; } pte_t;
90 #define pte_val(x) ((x).pte)
91 #define __pte(x) ((pte_t) { (x) } )
93 typedef struct page *pgtable_t;
96 * For 3-level pagetables we defines these ourselves, for 2-level the
97 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
101 typedef struct { unsigned long pmd; } pmd_t;
102 #define pmd_val(x) ((x).pmd)
103 #define __pmd(x) ((pmd_t) { (x) } )
108 * Right now we don't support 4-level pagetables, so all pud-related
109 * definitions come from <asm-generic/pgtable-nopud.h>.
113 * Finall the top of the hierarchy, the pgd
115 typedef struct { unsigned long pgd; } pgd_t;
116 #define pgd_val(x) ((x).pgd)
117 #define __pgd(x) ((pgd_t) { (x) } )
120 * Manipulate page protection bits
122 typedef struct { unsigned long pgprot; } pgprot_t;
123 #define pgprot_val(x) ((x).pgprot)
124 #define __pgprot(x) ((pgprot_t) { (x) } )
127 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
128 * pair of pages we only have a single global bit per pair of pages. When
129 * writing to the TLB make sure we always have the bit set for both pages
130 * or none. This macro is used to access the `buddy' of the pte we're just
133 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
135 #endif /* !__ASSEMBLY__ */
137 /* to align the pointer to the (next) page boundary */
138 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
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 */