1#ifndef __ASM_SH_PAGE_H
2#define __ASM_SH_PAGE_H
3
4/*
5 * Copyright (C) 1999  Niibe Yutaka
6 */
7
8/*
9   [ P0/U0 (virtual) ]		0x00000000     <------ User space
10   [ P1 (fixed)   cached ]	0x80000000     <------ Kernel space
11   [ P2 (fixed)  non-cachable]	0xA0000000     <------ Physical access
12   [ P3 (virtual) cached]	0xC0000000     <------ vmalloced area
13   [ P4 control   ]		0xE0000000
14 */
15
16#include <linux/config.h>
17
18/* PAGE_SHIFT determines the page size */
19#define PAGE_SHIFT	12
20#define PAGE_SIZE	(1UL << PAGE_SHIFT)
21#define PAGE_MASK	(~(PAGE_SIZE-1))
22#define PTE_MASK	PAGE_MASK
23
24#ifdef __KERNEL__
25#ifndef __ASSEMBLY__
26
27extern void clear_page(void *to);
28extern void copy_page(void *to, void *from);
29
30#if defined(__sh3__)
31#define clear_user_page(page, vaddr)	clear_page(page)
32#define copy_user_page(to, from, vaddr)	copy_page(to, from)
33#elif defined(__SH4__)
34extern void clear_user_page(void *to, unsigned long address);
35extern void copy_user_page(void *to, void *from, unsigned long address);
36extern void __clear_user_page(void *to, void *orig_to);
37extern void __copy_user_page(void *to, void *from, void *orig_to);
38#endif
39
40/*
41 * These are used to make use of C type-checking..
42 */
43typedef struct { unsigned long pte; } pte_t;
44typedef struct { unsigned long pmd; } pmd_t;
45typedef struct { unsigned long pgd; } pgd_t;
46typedef struct { unsigned long pgprot; } pgprot_t;
47
48#define pte_val(x)	((x).pte)
49#define pmd_val(x)	((x).pmd)
50#define pgd_val(x)	((x).pgd)
51#define pgprot_val(x)	((x).pgprot)
52
53#define __pte(x) ((pte_t) { (x) } )
54#define __pmd(x) ((pmd_t) { (x) } )
55#define __pgd(x) ((pgd_t) { (x) } )
56#define __pgprot(x)	((pgprot_t) { (x) } )
57
58#endif /* !__ASSEMBLY__ */
59
60/* to align the pointer to the (next) page boundary */
61#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
62
63/*
64 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
65 *
66 *	arch/sh/vmlinux.lds.S
67 *
68 * which has the same constant encoded..
69 */
70
71#define __MEMORY_START		CONFIG_MEMORY_START
72#define __MEMORY_SIZE		CONFIG_MEMORY_SIZE
73#ifdef CONFIG_DISCONTIGMEM
74/* Just for HP690, for now.. */
75#define __MEMORY_START_2ND	(__MEMORY_START+0x02000000)
76#define __MEMORY_SIZE_2ND	0x001000000 /* 16MB */
77#endif
78
79#define PAGE_OFFSET		(0x80000000UL)
80#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
81#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
82
83#ifndef CONFIG_DISCONTIGMEM
84#define phys_to_page(phys)	(mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
85#define VALID_PAGE(page)	((page - mem_map) < max_mapnr)
86#define page_to_phys(page)	(((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
87#endif
88
89#define virt_to_page(kaddr)	phys_to_page(__pa(kaddr))
90
91#ifndef __ASSEMBLY__
92
93/*
94 * Tell the user there is some problem.
95 */
96#define BUG() do { \
97	printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
98	asm volatile("nop"); \
99} while (0)
100
101#define PAGE_BUG(page) do { \
102	BUG(); \
103} while (0)
104
105/* Pure 2^n version of get_order */
106static __inline__ int get_order(unsigned long size)
107{
108	int order;
109
110	size = (size-1) >> (PAGE_SHIFT-1);
111	order = -1;
112	do {
113		size >>= 1;
114		order++;
115	} while (size);
116	return order;
117}
118
119#endif
120
121#endif /* __KERNEL__ */
122
123#endif /* __ASM_SH_PAGE_H */
124