include/asm-mips/page.h at v2.6.27-rc4

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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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kernel / include / asm-mips / page.h
at v2.6.27-rc4 191 lines 5.2 kB view raw
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  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#include <spaces.h>
 13
 14/*
 15 * PAGE_SHIFT determines the page size
 16 */
 17#ifdef CONFIG_PAGE_SIZE_4KB
 18#define PAGE_SHIFT	12
 19#endif
 20#ifdef CONFIG_PAGE_SIZE_8KB
 21#define PAGE_SHIFT	13
 22#endif
 23#ifdef CONFIG_PAGE_SIZE_16KB
 24#define PAGE_SHIFT	14
 25#endif
 26#ifdef CONFIG_PAGE_SIZE_64KB
 27#define PAGE_SHIFT	16
 28#endif
 29#define PAGE_SIZE	(1UL << PAGE_SHIFT)
 30#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))
 31
 32#ifndef __ASSEMBLY__
 33
 34#include <linux/pfn.h>
 35#include <asm/io.h>
 36
 37extern void build_clear_page(void);
 38extern void build_copy_page(void);
 39
 40/*
 41 * It's normally defined only for FLATMEM config but it's
 42 * used in our early mem init code for all memory models.
 43 * So always define it.
 44 */
 45#define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)
 46
 47extern void clear_page(void * page);
 48extern void copy_page(void * to, void * from);
 49
 50extern unsigned long shm_align_mask;
 51
 52static inline unsigned long pages_do_alias(unsigned long addr1,
 53	unsigned long addr2)
 54{
 55	return (addr1 ^ addr2) & shm_align_mask;
 56}
 57
 58struct page;
 59
 60static inline void clear_user_page(void *addr, unsigned long vaddr,
 61	struct page *page)
 62{
 63	extern void (*flush_data_cache_page)(unsigned long addr);
 64
 65	clear_page(addr);
 66	if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
 67		flush_data_cache_page((unsigned long)addr);
 68}
 69
 70extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 71	struct page *to);
 72struct vm_area_struct;
 73extern void copy_user_highpage(struct page *to, struct page *from,
 74	unsigned long vaddr, struct vm_area_struct *vma);
 75
 76#define __HAVE_ARCH_COPY_USER_HIGHPAGE
 77
 78/*
 79 * These are used to make use of C type-checking..
 80 */
 81#ifdef CONFIG_64BIT_PHYS_ADDR
 82  #ifdef CONFIG_CPU_MIPS32
 83    typedef struct { unsigned long pte_low, pte_high; } pte_t;
 84    #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
 85    #define __pte(x)      ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
 86  #else
 87     typedef struct { unsigned long long pte; } pte_t;
 88     #define pte_val(x)	((x).pte)
 89     #define __pte(x)	((pte_t) { (x) } )
 90  #endif
 91#else
 92typedef struct { unsigned long pte; } pte_t;
 93#define pte_val(x)	((x).pte)
 94#define __pte(x)	((pte_t) { (x) } )
 95#endif
 96typedef struct page *pgtable_t;
 97
 98/*
 99 * For 3-level pagetables we defines these ourselves, for 2-level the
100 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
101 */
102#ifdef CONFIG_64BIT
103
104typedef struct { unsigned long pmd; } pmd_t;
105#define pmd_val(x)	((x).pmd)
106#define __pmd(x)	((pmd_t) { (x) } )
107
108#endif
109
110/*
111 * Right now we don't support 4-level pagetables, so all pud-related
112 * definitions come from <asm-generic/pgtable-nopud.h>.
113 */
114
115/*
116 * Finall the top of the hierarchy, the pgd
117 */
118typedef struct { unsigned long pgd; } pgd_t;
119#define pgd_val(x)	((x).pgd)
120#define __pgd(x)	((pgd_t) { (x) } )
121
122/*
123 * Manipulate page protection bits
124 */
125typedef struct { unsigned long pgprot; } pgprot_t;
126#define pgprot_val(x)	((x).pgprot)
127#define __pgprot(x)	((pgprot_t) { (x) } )
128
129/*
130 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
131 * pair of pages we only have a single global bit per pair of pages.  When
132 * writing to the TLB make sure we always have the bit set for both pages
133 * or none.  This macro is used to access the `buddy' of the pte we're just
134 * working on.
135 */
136#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
137
138#endif /* !__ASSEMBLY__ */
139
140/*
141 * __pa()/__va() should be used only during mem init.
142 */
143#ifdef CONFIG_64BIT
144#define __pa(x)								\
145({									\
146    unsigned long __x = (unsigned long)(x);				\
147    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);			\
148})
149#else
150#define __pa(x)								\
151    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
152#endif
153#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
154#define __pa_symbol(x)	__pa(RELOC_HIDE((unsigned long)(x), 0))
155
156#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
157
158#ifdef CONFIG_FLATMEM
159
160#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
161
162#elif defined(CONFIG_SPARSEMEM)
163
164/* pfn_valid is defined in linux/mmzone.h */
165
166#elif defined(CONFIG_NEED_MULTIPLE_NODES)
167
168#define pfn_valid(pfn)							\
169({									\
170	unsigned long __pfn = (pfn);					\
171	int __n = pfn_to_nid(__pfn);					\
172	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +		\
173	                       NODE_DATA(__n)->node_spanned_pages)	\
174	            : 0);						\
175})
176
177#endif
178
179#define virt_to_page(kaddr)	pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
180#define virt_addr_valid(kaddr)	pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
181
182#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
183				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
184
185#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
186#define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)
187
188#include <asm-generic/memory_model.h>
189#include <asm-generic/page.h>
190
191#endif /* _ASM_PAGE_H */
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