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>
38 #include <asm/cpu-features.h>
41 extern void clear_page(void * page);
42 extern void copy_page(void * to, void * from);
44 extern unsigned long shm_align_mask;
46 static inline unsigned long pages_do_alias(unsigned long addr1,
49 return (addr1 ^ addr2) & shm_align_mask;
54 static inline void clear_user_page(void *addr, unsigned long vaddr,
57 extern void (*flush_data_cache_page)(unsigned long addr);
60 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
61 flush_data_cache_page((unsigned long)addr);
64 static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
67 extern void (*flush_data_cache_page)(unsigned long addr);
69 copy_page(vto, vfrom);
70 if (!cpu_has_ic_fills_f_dc ||
71 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
72 flush_data_cache_page((unsigned long)vto);
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) } )
95 * For 3-level pagetables we defines these ourselves, for 2-level the
96 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
100 typedef struct { unsigned long pmd; } pmd_t;
101 #define pmd_val(x) ((x).pmd)
102 #define __pmd(x) ((pmd_t) { (x) } )
107 * Right now we don't support 4-level pagetables, so all pud-related
108 * definitions come from <asm-generic/pgtable-nopud.h>.
112 * Finall the top of the hierarchy, the pgd
114 typedef struct { unsigned long pgd; } pgd_t;
115 #define pgd_val(x) ((x).pgd)
116 #define __pgd(x) ((pgd_t) { (x) } )
119 * Manipulate page protection bits
121 typedef struct { unsigned long pgprot; } pgprot_t;
122 #define pgprot_val(x) ((x).pgprot)
123 #define __pgprot(x) ((pgprot_t) { (x) } )
126 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
127 * pair of pages we only have a single global bit per pair of pages. When
128 * writing to the TLB make sure we always have the bit set for both pages
129 * or none. This macro is used to access the `buddy' of the pte we're just
132 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
134 #endif /* !__ASSEMBLY__ */
136 /* to align the pointer to the (next) page boundary */
137 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
139 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
140 #define __pa_page_offset(x) ((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0)
142 #define __pa_page_offset(x) PAGE_OFFSET
144 #define __pa(x) ((unsigned long)(x) - __pa_page_offset(x))
145 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
146 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
148 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
150 #ifdef CONFIG_FLATMEM
152 #define pfn_valid(pfn) ((pfn) < max_mapnr)
154 #elif defined(CONFIG_SPARSEMEM)
156 /* pfn_valid is defined in linux/mmzone.h */
158 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
160 #define pfn_valid(pfn) \
162 unsigned long __pfn = (pfn); \
163 int __n = pfn_to_nid(__pfn); \
164 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
165 NODE_DATA(__n)->node_spanned_pages) \
171 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
172 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
174 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
175 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
177 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
178 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
180 #ifdef CONFIG_LIMITED_DMA
181 #define WANT_PAGE_VIRTUAL
184 #include <asm-generic/memory_model.h>
185 #include <asm-generic/page.h>
187 #endif /* defined (__KERNEL__) */
189 #endif /* _ASM_PAGE_H */