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))
38 * This gives the physical RAM offset.
41 #define PHYS_OFFSET 0UL
45 * It's normally defined only for FLATMEM config but it's
46 * used in our early mem init code for all memory models.
47 * So always define it.
49 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
51 #include <linux/pfn.h>
52 #include <asm/cpu-features.h>
55 extern void clear_page(void * page
);
56 extern void copy_page(void * to
, void * from
);
58 extern unsigned long shm_align_mask
;
59 extern unsigned char shm_align_shift
;
61 #define VALIAS_PAGE_OFFSET_MASK (shm_align_mask)
62 #define VALIAS_PAGE_MASK (~VALIAS_PAGE_OFFSET_MASK)
63 #define VALIAS_PAGE_SHIFT (shm_align_shift)
64 #define VALIAS_SHIFT (VALIAS_PAGE_SHIFT - PAGE_SHIFT)
65 #define VALIAS_PAGE_SIZE (1UL << VALIAS_PAGE_SHIFT)
66 #define VALIAS_IDX(x) ((x) << VALIAS_SHIFT)
68 static inline unsigned long pages_do_alias(unsigned long addr1
,
71 return (addr1
^ addr2
) & shm_align_mask
;
76 static inline void clear_user_page(void *addr
, unsigned long vaddr
,
79 extern void (*flush_data_cache_page
)(unsigned long addr
);
82 if (pages_do_alias((unsigned long) addr
, vaddr
& PAGE_MASK
))
83 flush_data_cache_page((unsigned long)addr
);
86 static inline void copy_user_page(void *vto
, void *vfrom
, unsigned long vaddr
,
89 extern void (*flush_data_cache_page
)(unsigned long addr
);
91 copy_page(vto
, vfrom
);
92 if (!cpu_has_ic_fills_f_dc
||
93 pages_do_alias((unsigned long)vto
, vaddr
& PAGE_MASK
))
94 flush_data_cache_page((unsigned long)vto
);
98 * These are used to make use of C type-checking..
100 #ifdef CONFIG_64BIT_PHYS_ADDR
101 #ifdef CONFIG_CPU_MIPS32
102 typedef struct { unsigned long pte_low
, pte_high
; } pte_t
;
103 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
104 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
106 typedef struct { unsigned long long pte
; } pte_t
;
107 #define pte_val(x) ((x).pte)
108 #define __pte(x) ((pte_t) { (x) } )
111 typedef struct { unsigned long pte
; } pte_t
;
112 #define pte_val(x) ((x).pte)
113 #define __pte(x) ((pte_t) { (x) } )
117 * For 3-level pagetables we defines these ourselves, for 2-level the
118 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
122 typedef struct { unsigned long pmd
; } pmd_t
;
123 #define pmd_val(x) ((x).pmd)
124 #define __pmd(x) ((pmd_t) { (x) } )
129 * Right now we don't support 4-level pagetables, so all pud-related
130 * definitions come from <asm-generic/pgtable-nopud.h>.
134 * Finall the top of the hierarchy, the pgd
136 typedef struct { unsigned long pgd
; } pgd_t
;
137 #define pgd_val(x) ((x).pgd)
138 #define __pgd(x) ((pgd_t) { (x) } )
141 * Manipulate page protection bits
143 typedef struct { unsigned long pgprot
; } pgprot_t
;
144 #define pgprot_val(x) ((x).pgprot)
145 #define __pgprot(x) ((pgprot_t) { (x) } )
148 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
149 * pair of pages we only have a single global bit per pair of pages. When
150 * writing to the TLB make sure we always have the bit set for both pages
151 * or none. This macro is used to access the `buddy' of the pte we're just
154 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
156 #endif /* !__ASSEMBLY__ */
158 /* to align the pointer to the (next) page boundary */
159 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
162 * __pa()/__va() should be used only during mem init.
164 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
165 #define __pa_page_offset(x) ((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0)
167 #define __pa_page_offset(x) PAGE_OFFSET
169 #define __pa(x) ((unsigned long)(x) - __pa_page_offset(x) + PHYS_OFFSET)
170 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
171 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
173 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
175 #ifdef CONFIG_FLATMEM
177 #define pfn_valid(pfn) \
179 unsigned long __pfn = (pfn); \
180 /* avoid <linux/bootmem.h> include hell */ \
181 extern unsigned long min_low_pfn; \
183 __pfn >= min_low_pfn && __pfn < max_mapnr; \
186 #elif defined(CONFIG_SPARSEMEM)
188 /* pfn_valid is defined in linux/mmzone.h */
190 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
192 #define pfn_valid(pfn) \
194 unsigned long __pfn = (pfn); \
195 int __n = pfn_to_nid(__pfn); \
196 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
197 NODE_DATA(__n)->node_spanned_pages) \
203 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
204 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
206 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
207 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
209 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
210 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
212 #include <asm-generic/memory_model.h>
213 #include <asm-generic/page.h>
215 #endif /* defined (__KERNEL__) */
217 #endif /* _ASM_PAGE_H */