2 * Definitions for page handling
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
8 * Copyright (C) 1994 - 1999 by Ralf Baechle
13 #include <linux/config.h>
15 /* PAGE_SHIFT determines the page size */
17 #define PAGE_SIZE (1L << PAGE_SHIFT)
18 #define PAGE_MASK (~(PAGE_SIZE-1))
24 #define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; } while (0)
25 #define PAGE_BUG(page) do { BUG(); } while (0)
28 * Prototypes for clear_page / copy_page variants with processor dependant
31 void andes_clear_page(void * page);
32 void mips32_clear_page_dc(unsigned long page);
33 void mips32_clear_page_sc(unsigned long page);
34 void r3k_clear_page(void * page);
35 void r4k_clear_page_d16(void * page);
36 void r4k_clear_page_d32(void * page);
37 void r4k_clear_page_r4600_v1(void * page);
38 void r4k_clear_page_r4600_v2(void * page);
39 void r4k_clear_page_s16(void * page);
40 void r4k_clear_page_s32(void * page);
41 void r4k_clear_page_s64(void * page);
42 void r4k_clear_page_s128(void * page);
43 void r5432_clear_page_d32(void * page);
44 void rm7k_clear_page(void * page);
45 void sb1_clear_page(void * page);
46 void andes_copy_page(void * to, void * from);
47 void mips32_copy_page_dc(unsigned long to, unsigned long from);
48 void mips32_copy_page_sc(unsigned long to, unsigned long from);
49 void r3k_copy_page(void * to, void * from);
50 void r4k_copy_page_d16(void * to, void * from);
51 void r4k_copy_page_d32(void * to, void * from);
52 void r4k_copy_page_r4600_v1(void * to, void * from);
53 void r4k_copy_page_r4600_v2(void * to, void * from);
54 void r4k_copy_page_s16(void * to, void * from);
55 void r4k_copy_page_s32(void * to, void * from);
56 void r4k_copy_page_s64(void * to, void * from);
57 void r4k_copy_page_s128(void * to, void * from);
58 void r5432_copy_page_d32(void * to, void * from);
59 void rm7k_copy_page(void * to, void * from);
60 void sb1_copy_page(void * to, void * from);
62 extern void (*_clear_page)(void * page);
63 extern void (*_copy_page)(void * to, void * from);
65 #define clear_page(page) _clear_page(page)
66 #define copy_page(to, from) _copy_page(to, from)
67 #define clear_user_page(page, vaddr) clear_page(page)
68 #define copy_user_page(to, from, vaddr) copy_page(to, from)
71 * These are used to make use of C type-checking..
73 #ifdef CONFIG_64BIT_PHYS_ADDR
74 typedef struct { unsigned long long pte; } pte_t;
76 typedef struct { unsigned long pte; } pte_t;
78 typedef struct { unsigned long pmd; } pmd_t;
79 typedef struct { unsigned long pgd; } pgd_t;
80 typedef struct { unsigned long pgprot; } pgprot_t;
82 #define pte_val(x) ((x).pte)
83 #define pmd_val(x) ((x).pmd)
84 #define pgd_val(x) ((x).pgd)
85 #define pgprot_val(x) ((x).pgprot)
87 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
89 #define __pte(x) ((pte_t) { (x) } )
90 #define __pmd(x) ((pmd_t) { (x) } )
91 #define __pgd(x) ((pgd_t) { (x) } )
92 #define __pgprot(x) ((pgprot_t) { (x) } )
94 /* Pure 2^n version of get_order */
95 extern __inline__ int get_order(unsigned long size)
99 size = (size-1) >> (PAGE_SHIFT-1);
108 #endif /* !__ASSEMBLY__ */
110 /* to align the pointer to the (next) page boundary */
111 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
114 * This handles the memory map.
115 * We handle pages at KSEG0 for kernels with 32 bit address space.
117 #define PAGE_OFFSET 0x80000000UL
118 #define UNCAC_BASE 0xa0000000UL
120 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
121 #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
122 #define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
123 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
125 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
126 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
128 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
129 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
132 * Memory above this physical address will be considered highmem.
134 #define HIGHMEM_START (0x20000000)
136 #endif /* defined (__KERNEL__) */
138 #endif /* __ASM_PAGE_H */