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, 03 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PAGE_H
10#define _ASM_PAGE_H
11
12
13#ifdef __KERNEL__
14
15#include <spaces.h>
16
17/*
18 * PAGE_SHIFT determines the page size
19 */
20#ifdef CONFIG_PAGE_SIZE_4KB
21#define PAGE_SHIFT	12
22#endif
23#ifdef CONFIG_PAGE_SIZE_8KB
24#define PAGE_SHIFT	13
25#endif
26#ifdef CONFIG_PAGE_SIZE_16KB
27#define PAGE_SHIFT	14
28#endif
29#ifdef CONFIG_PAGE_SIZE_64KB
30#define PAGE_SHIFT	16
31#endif
32#define PAGE_SIZE	(1UL << PAGE_SHIFT)
33#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
34
35#ifndef __ASSEMBLY__
36
37/*
38 * This gives the physical RAM offset.
39 */
40#ifndef PHYS_OFFSET
41#define PHYS_OFFSET		0UL
42#endif
43
44/*
45 * It's normally defined only for FLATMEM config but it's
46 * used in our early mem init code for all memory models.
47 * So always define it.
48 */
49#define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)
50
51#include <linux/pfn.h>
52#include <asm/io.h>
53
54extern void clear_page(void * page);
55extern void copy_page(void * to, void * from);
56
57extern unsigned long shm_align_mask;
58
59static inline unsigned long pages_do_alias(unsigned long addr1,
60	unsigned long addr2)
61{
62	return (addr1 ^ addr2) & shm_align_mask;
63}
64
65struct page;
66
67static inline void clear_user_page(void *addr, unsigned long vaddr,
68	struct page *page)
69{
70	extern void (*flush_data_cache_page)(unsigned long addr);
71
72	clear_page(addr);
73	if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
74		flush_data_cache_page((unsigned long)addr);
75}
76
77extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
78	struct page *to);
79struct vm_area_struct;
80extern void copy_user_highpage(struct page *to, struct page *from,
81	unsigned long vaddr, struct vm_area_struct *vma);
82
83#define __HAVE_ARCH_COPY_USER_HIGHPAGE
84
85/*
86 * These are used to make use of C type-checking..
87 */
88#ifdef CONFIG_64BIT_PHYS_ADDR
89  #ifdef CONFIG_CPU_MIPS32
90    typedef struct { unsigned long pte_low, pte_high; } pte_t;
91    #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
92    #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
93  #else
94     typedef struct { unsigned long long pte; } pte_t;
95     #define pte_val(x)	((x).pte)
96     #define __pte(x)	((pte_t) { (x) } )
97  #endif
98#else
99typedef struct { unsigned long pte; } pte_t;
100#define pte_val(x)	((x).pte)
101#define __pte(x)	((pte_t) { (x) } )
102#endif
103
104/*
105 * For 3-level pagetables we defines these ourselves, for 2-level the
106 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
107 */
108#ifdef CONFIG_64BIT
109
110typedef struct { unsigned long pmd; } pmd_t;
111#define pmd_val(x)	((x).pmd)
112#define __pmd(x)	((pmd_t) { (x) } )
113
114#endif
115
116/*
117 * Right now we don't support 4-level pagetables, so all pud-related
118 * definitions come from <asm-generic/pgtable-nopud.h>.
119 */
120
121/*
122 * Finall the top of the hierarchy, the pgd
123 */
124typedef struct { unsigned long pgd; } pgd_t;
125#define pgd_val(x)	((x).pgd)
126#define __pgd(x)	((pgd_t) { (x) } )
127
128/*
129 * Manipulate page protection bits
130 */
131typedef struct { unsigned long pgprot; } pgprot_t;
132#define pgprot_val(x)	((x).pgprot)
133#define __pgprot(x)	((pgprot_t) { (x) } )
134
135/*
136 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
137 * pair of pages we only have a single global bit per pair of pages.  When
138 * writing to the TLB make sure we always have the bit set for both pages
139 * or none.  This macro is used to access the `buddy' of the pte we're just
140 * working on.
141 */
142#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
143
144#endif /* !__ASSEMBLY__ */
145
146/* to align the pointer to the (next) page boundary */
147#define PAGE_ALIGN(addr)	(((addr) + PAGE_SIZE - 1) & PAGE_MASK)
148
149/*
150 * __pa()/__va() should be used only during mem init.
151 */
152#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
153#define __pa_page_offset(x)	((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0)
154#else
155#define __pa_page_offset(x)	PAGE_OFFSET
156#endif
157#define __pa(x)		((unsigned long)(x) - __pa_page_offset(x) + PHYS_OFFSET)
158#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
159#define __pa_symbol(x)	__pa(RELOC_HIDE((unsigned long)(x),0))
160
161#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
162
163#ifdef CONFIG_FLATMEM
164
165#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
166
167#elif defined(CONFIG_SPARSEMEM)
168
169/* pfn_valid is defined in linux/mmzone.h */
170
171#elif defined(CONFIG_NEED_MULTIPLE_NODES)
172
173#define pfn_valid(pfn)							\
174({									\
175	unsigned long __pfn = (pfn);					\
176	int __n = pfn_to_nid(__pfn);					\
177	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +		\
178	                       NODE_DATA(__n)->node_spanned_pages)	\
179	            : 0);						\
180})
181
182#endif
183
184#define virt_to_page(kaddr)	pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
185#define virt_addr_valid(kaddr)	pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
186
187#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
188				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
189
190#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
191#define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)
192
193#include <asm-generic/memory_model.h>
194#include <asm-generic/page.h>
195
196#endif /* defined (__KERNEL__) */
197
198#endif /* _ASM_PAGE_H */
199