1/*
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
4 * for more details.
5 *
6 * Copyright (C) 1994 - 1999, 2000 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PAGE_H
10#define _ASM_PAGE_H
11
12#include <linux/config.h>
13
14/* PAGE_SHIFT determines the page size */
15#define PAGE_SHIFT	12
16#define PAGE_SIZE	(1UL << PAGE_SHIFT)
17#define PAGE_MASK	(~(PAGE_SIZE-1))
18
19#ifdef __KERNEL__
20
21#ifndef __ASSEMBLY__
22
23#define BUG() do { printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); *(int *)0=0; } while (0)
24#define PAGE_BUG(page) do {  BUG(); } while (0)
25
26/*
27 * Prototypes for clear_page / copy_page variants with processor dependant
28 * optimizations.
29 */
30void sb1_clear_page(void * page);
31void sb1_copy_page(void * to, void * from);
32
33extern void (*_clear_page)(void * page);
34extern void (*_copy_page)(void * to, void * from);
35
36extern void mips64_clear_page_dc(unsigned long page);
37extern void mips64_clear_page_sc(unsigned long page);
38void r4k_clear_page_d16(void * page);
39void r4k_clear_page_d32(void * page);
40void r4k_clear_page_r4600_v1(void * page);
41void r4k_clear_page_r4600_v2(void * page);
42void r4k_clear_page_s16(void * page);
43void r4k_clear_page_s32(void * page);
44void r4k_clear_page_s64(void * page);
45void r4k_clear_page_s128(void * page);
46
47extern void mips64_copy_page_dc(unsigned long to, unsigned long from);
48extern void mips64_copy_page_sc(unsigned long to, unsigned long from);
49void r4k_copy_page_d16(void * to, void * from);
50void r4k_copy_page_d32(void * to, void * from);
51void r4k_copy_page_r4600_v1(void * to, void * from);
52void r4k_copy_page_r4600_v2(void * to, void * from);
53void r4k_copy_page_s16(void * to, void * from);
54void r4k_copy_page_s32(void * to, void * from);
55void r4k_copy_page_s64(void * to, void * from);
56void r4k_copy_page_s128(void * to, void * from);
57
58#define clear_page(page)	_clear_page(page)
59#define copy_page(to, from)	_copy_page(to, from)
60#define clear_user_page(page, vaddr)	clear_page(page)
61#define copy_user_page(to, from, vaddr)	copy_page(to, from)
62
63/*
64 * These are used to make use of C type-checking..
65 */
66typedef struct { unsigned long pte; } pte_t;
67typedef struct { unsigned long pmd; } pmd_t;
68typedef struct { unsigned long pgd; } pgd_t;
69typedef struct { unsigned long pgprot; } pgprot_t;
70
71#define pte_val(x)	((x).pte)
72#define pmd_val(x)	((x).pmd)
73#define pgd_val(x)	((x).pgd)
74#define pgprot_val(x)	((x).pgprot)
75
76#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
77
78#define __pte(x)	((pte_t) { (x) } )
79#define __pmd(x)	((pmd_t) { (x) } )
80#define __pgd(x)	((pgd_t) { (x) } )
81#define __pgprot(x)	((pgprot_t) { (x) } )
82
83/* Pure 2^n version of get_order */
84extern __inline__ int get_order(unsigned long size)
85{
86	int order;
87
88	size = (size-1) >> (PAGE_SHIFT-1);
89	order = -1;
90	do {
91       		size >>= 1;
92       		order++;
93	} while (size);
94	return order;
95}
96
97#endif /* !__ASSEMBLY__ */
98
99/* to align the pointer to the (next) page boundary */
100#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
101
102/*
103 * This handles the memory map.
104 * We handle pages at KSEG0 for kernels with upto 512mb of memory,
105 * at XKPHYS with a suitable caching mode for kernels with more than that.
106 */
107#if defined(CONFIG_SGI_IP22) || defined(CONFIG_MIPS_ATLAS) || \
108    defined(CONFIG_MIPS_MALTA) || defined(CONFIG_MIPS_SEAD) || \
109    defined(CONFIG_DECSTATION)
110#define PAGE_OFFSET	0xffffffff80000000UL
111#define UNCAC_BASE	0xffffffffa0000000UL
112#endif
113#if defined(CONFIG_SGI_IP32)
114#define PAGE_OFFSET	0x9800000000000000UL
115#define UNCAC_BASE	0x9000000000000000UL
116#endif
117#if defined(CONFIG_SGI_IP27)
118#define PAGE_OFFSET	0xa800000000000000UL
119#define UNCAC_BASE	0x9600000000000000UL
120#endif
121#if defined(CONFIG_SIBYTE_SB1250)
122#define PAGE_OFFSET	0xa800000000000000UL
123#endif
124
125#define __pa(x)		((unsigned long) (x) - PAGE_OFFSET)
126#define __va(x)		((void *)((unsigned long) (x) + PAGE_OFFSET))
127#ifndef CONFIG_DISCONTIGMEM
128#define virt_to_page(kaddr)	(mem_map + (__pa(kaddr) >> PAGE_SHIFT))
129#define VALID_PAGE(page)	((page - mem_map) < max_mapnr)
130#endif
131
132#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
133#define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)
134
135#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
136				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
137
138#endif /* defined (__KERNEL__) */
139
140#endif /* _ASM_PAGE_H */
141