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>
18 * PAGE_SHIFT determines the page size
20 #ifdef CONFIG_PAGE_SIZE_4KB
23 #ifdef CONFIG_PAGE_SIZE_16KB
26 #ifdef CONFIG_PAGE_SIZE_64KB
29 #define PAGE_SIZE (1UL << PAGE_SHIFT)
30 #define PAGE_MASK (~(PAGE_SIZE-1))
34 extern void clear_page(void * page);
35 extern void copy_page(void * to, void * from);
37 extern unsigned long shm_align_mask;
39 static inline unsigned long pages_do_alias(unsigned long addr1,
42 return (addr1 ^ addr2) & shm_align_mask;
47 static inline void clear_user_page(void *addr, unsigned long vaddr,
50 extern void (*flush_data_cache_page)(unsigned long addr);
53 if (pages_do_alias((unsigned long) addr, vaddr))
54 flush_data_cache_page((unsigned long)addr);
57 static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
60 extern void (*flush_data_cache_page)(unsigned long addr);
62 copy_page(vto, vfrom);
63 if (pages_do_alias((unsigned long)vto, vaddr))
64 flush_data_cache_page((unsigned long)vto);
68 * These are used to make use of C type-checking..
70 #ifdef CONFIG_64BIT_PHYS_ADDR
71 typedef struct { unsigned long long pte; } pte_t;
73 typedef struct { unsigned long pte; } pte_t;
75 typedef struct { unsigned long pmd; } pmd_t;
76 typedef struct { unsigned long pgd; } pgd_t;
77 typedef struct { unsigned long pgprot; } pgprot_t;
79 #define pte_val(x) ((x).pte)
80 #define pmd_val(x) ((x).pmd)
81 #define pgd_val(x) ((x).pgd)
82 #define pgprot_val(x) ((x).pgprot)
84 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
86 #define __pte(x) ((pte_t) { (x) } )
87 #define __pmd(x) ((pmd_t) { (x) } )
88 #define __pgd(x) ((pgd_t) { (x) } )
89 #define __pgprot(x) ((pgprot_t) { (x) } )
91 /* Pure 2^n version of get_order */
92 static __inline__ int get_order(unsigned long size)
96 size = (size-1) >> (PAGE_SHIFT-1);
105 #endif /* !__ASSEMBLY__ */
107 /* to align the pointer to the (next) page boundary */
108 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
110 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
111 #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
113 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
115 #ifndef CONFIG_DISCONTIGMEM
116 #define pfn_to_page(pfn) (mem_map + (pfn))
117 #define page_to_pfn(page) ((unsigned long)((page) - mem_map))
118 #define pfn_valid(pfn) ((pfn) < max_mapnr)
121 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
122 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
124 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
125 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
127 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
128 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
130 #endif /* defined (__KERNEL__) */
132 #ifdef CONFIG_LIMITED_DMA
133 #define WANT_PAGE_VIRTUAL
136 #endif /* _ASM_PAGE_H */