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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/asm-mips/page.h
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.
12 #include <linux/config.h>
21 * PAGE_SHIFT determines the page size
23 #ifdef CONFIG_PAGE_SIZE_4KB
26 #ifdef CONFIG_PAGE_SIZE_8KB
29 #ifdef CONFIG_PAGE_SIZE_16KB
32 #ifdef CONFIG_PAGE_SIZE_64KB
35 #define PAGE_SIZE (1UL << PAGE_SHIFT)
36 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
42 extern void clear_page(void * page
);
43 extern void copy_page(void * to
, void * from
);
45 extern unsigned long shm_align_mask
;
47 static inline unsigned long pages_do_alias(unsigned long addr1
,
50 return (addr1
^ addr2
) & shm_align_mask
;
55 static inline void clear_user_page(void *addr
, unsigned long vaddr
,
58 extern void (*flush_data_cache_page
)(unsigned long addr
);
61 if (pages_do_alias((unsigned long) addr
, vaddr
))
62 flush_data_cache_page((unsigned long)addr
);
65 static inline void copy_user_page(void *vto
, void *vfrom
, unsigned long vaddr
,
68 extern void (*flush_data_cache_page
)(unsigned long addr
);
70 copy_page(vto
, vfrom
);
71 if (pages_do_alias((unsigned long)vto
, vaddr
))
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))
83 typedef struct { unsigned long long pte
; } pte_t
;
84 #define pte_val(x) ((x).pte)
87 typedef struct { unsigned long pte
; } pte_t
;
88 #define pte_val(x) ((x).pte)
91 typedef struct { unsigned long pmd
; } pmd_t
;
92 typedef struct { unsigned long pgd
; } pgd_t
;
93 typedef struct { unsigned long pgprot
; } pgprot_t
;
95 #define pmd_val(x) ((x).pmd)
96 #define pgd_val(x) ((x).pgd)
97 #define pgprot_val(x) ((x).pgprot)
99 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
101 #define __pte(x) ((pte_t) { (x) } )
102 #define __pmd(x) ((pmd_t) { (x) } )
103 #define __pgd(x) ((pgd_t) { (x) } )
104 #define __pgprot(x) ((pgprot_t) { (x) } )
106 /* Pure 2^n version of get_order */
107 static __inline__
int get_order(unsigned long size
)
111 size
= (size
-1) >> (PAGE_SHIFT
-1);
120 #endif /* !__ASSEMBLY__ */
122 /* to align the pointer to the (next) page boundary */
123 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
125 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
126 #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
128 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
130 #ifndef CONFIG_DISCONTIGMEM
131 #define pfn_to_page(pfn) (mem_map + (pfn))
132 #define page_to_pfn(page) ((unsigned long)((page) - mem_map))
133 #define pfn_valid(pfn) ((pfn) < max_mapnr)
136 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
137 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
139 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
140 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
142 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
143 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
145 #endif /* defined (__KERNEL__) */
147 #ifdef CONFIG_LIMITED_DMA
148 #define WANT_PAGE_VIRTUAL
151 #endif /* _ASM_PAGE_H */