Linux Kernel  3.7.1
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page.h
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1 #ifndef __ASM_SH_PAGE_H
2 #define __ASM_SH_PAGE_H
3 
4 /*
5  * Copyright (C) 1999 Niibe Yutaka
6  */
7 
8 #include <linux/const.h>
9 
10 /* PAGE_SHIFT determines the page size */
11 #if defined(CONFIG_PAGE_SIZE_4KB)
12 # define PAGE_SHIFT 12
13 #elif defined(CONFIG_PAGE_SIZE_8KB)
14 # define PAGE_SHIFT 13
15 #elif defined(CONFIG_PAGE_SIZE_16KB)
16 # define PAGE_SHIFT 14
17 #elif defined(CONFIG_PAGE_SIZE_64KB)
18 # define PAGE_SHIFT 16
19 #else
20 # error "Bogus kernel page size?"
21 #endif
22 
23 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
24 #define PAGE_MASK (~(PAGE_SIZE-1))
25 #define PTE_MASK PAGE_MASK
26 
27 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
28 #define HPAGE_SHIFT 16
29 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
30 #define HPAGE_SHIFT 18
31 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
32 #define HPAGE_SHIFT 20
33 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
34 #define HPAGE_SHIFT 22
35 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
36 #define HPAGE_SHIFT 26
37 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
38 #define HPAGE_SHIFT 29
39 #endif
40 
41 #ifdef CONFIG_HUGETLB_PAGE
42 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
43 #define HPAGE_MASK (~(HPAGE_SIZE-1))
44 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
45 #endif
46 
47 #ifndef __ASSEMBLY__
48 #include <asm/uncached.h>
49 
50 extern unsigned long shm_align_mask;
51 extern unsigned long max_low_pfn, min_low_pfn;
52 extern unsigned long memory_start, memory_end, memory_limit;
53 
54 static inline unsigned long
55 pages_do_alias(unsigned long addr1, unsigned long addr2)
56 {
57  return (addr1 ^ addr2) & shm_align_mask;
58 }
59 
60 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
61 extern void copy_page(void *to, void *from);
62 
63 struct page;
64 struct vm_area_struct;
65 
66 extern void copy_user_highpage(struct page *to, struct page *from,
67  unsigned long vaddr, struct vm_area_struct *vma);
68 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
69 extern void clear_user_highpage(struct page *page, unsigned long vaddr);
70 #define clear_user_highpage clear_user_highpage
71 
72 /*
73  * These are used to make use of C type-checking..
74  */
75 #ifdef CONFIG_X2TLB
76 typedef struct { unsigned long pte_low, pte_high; } pte_t;
77 typedef struct { unsigned long long pgprot; } pgprot_t;
78 typedef struct { unsigned long long pgd; } pgd_t;
79 #define pte_val(x) \
80  ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
81 #define __pte(x) \
82  ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
83 #elif defined(CONFIG_SUPERH32)
84 typedef struct { unsigned long pte_low; } pte_t;
85 typedef struct { unsigned long pgprot; } pgprot_t;
86 typedef struct { unsigned long pgd; } pgd_t;
87 #define pte_val(x) ((x).pte_low)
88 #define __pte(x) ((pte_t) { (x) } )
89 #else
90 typedef struct { unsigned long long pte_low; } pte_t;
91 typedef struct { unsigned long long pgprot; } pgprot_t;
92 typedef struct { unsigned long pgd; } pgd_t;
93 #define pte_val(x) ((x).pte_low)
94 #define __pte(x) ((pte_t) { (x) } )
95 #endif
96 
97 #define pgd_val(x) ((x).pgd)
98 #define pgprot_val(x) ((x).pgprot)
99 
100 #define __pgd(x) ((pgd_t) { (x) } )
101 #define __pgprot(x) ((pgprot_t) { (x) } )
102 
103 typedef struct page *pgtable_t;
104 
105 #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
106 
107 #endif /* !__ASSEMBLY__ */
108 
109 /*
110  * __MEMORY_START and SIZE are the physical addresses and size of RAM.
111  */
112 #define __MEMORY_START CONFIG_MEMORY_START
113 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
114 
115 /*
116  * PHYSICAL_OFFSET is the offset in physical memory where the base
117  * of the kernel is loaded.
118  */
119 #ifdef CONFIG_PHYSICAL_START
120 #define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
121 #else
122 #define PHYSICAL_OFFSET 0
123 #endif
124 
125 /*
126  * PAGE_OFFSET is the virtual address of the start of kernel address
127  * space.
128  */
129 #define PAGE_OFFSET CONFIG_PAGE_OFFSET
130 
131 /*
132  * Virtual to physical RAM address translation.
133  *
134  * In 29 bit mode, the physical offset of RAM from address 0 is visible in
135  * the kernel virtual address space, and thus we don't have to take
136  * this into account when translating. However in 32 bit mode this offset
137  * is not visible (it is part of the PMB mapping) and so needs to be
138  * added or subtracted as required.
139  */
140 #ifdef CONFIG_PMB
141 #define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START)
142 #define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START)
143 #else
144 #define ___pa(x) ((x)-PAGE_OFFSET)
145 #define ___va(x) ((x)+PAGE_OFFSET)
146 #endif
147 
148 #ifndef __ASSEMBLY__
149 #define __pa(x) ___pa((unsigned long)x)
150 #define __va(x) (void *)___va((unsigned long)x)
151 #endif /* !__ASSEMBLY__ */
152 
153 #ifdef CONFIG_UNCACHED_MAPPING
154 #if defined(CONFIG_29BIT)
155 #define UNCAC_ADDR(addr) P2SEGADDR(addr)
156 #define CAC_ADDR(addr) P1SEGADDR(addr)
157 #else
158 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start)
159 #define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET)
160 #endif
161 #else
162 #define UNCAC_ADDR(addr) ((addr))
163 #define CAC_ADDR(addr) ((addr))
164 #endif
165 
166 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
167 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
168 
169 /*
170  * PFN = physical frame number (ie PFN 0 == physical address 0)
171  * PFN_START is the PFN of the first page of RAM. By defining this we
172  * don't have struct page entries for the portion of address space
173  * between physical address 0 and the start of RAM.
174  */
175 #define PFN_START (__MEMORY_START >> PAGE_SHIFT)
176 #define ARCH_PFN_OFFSET (PFN_START)
177 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
178 #ifdef CONFIG_FLATMEM
179 #define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
180 #endif
181 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
182 
183 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
184  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
185 
187 #include <asm-generic/getorder.h>
188 
189 /* vDSO support */
190 #ifdef CONFIG_VSYSCALL
191 #define __HAVE_ARCH_GATE_AREA
192 #endif
193 
194 /*
195  * Some drivers need to perform DMA into kmalloc'ed buffers
196  * and so we have to increase the kmalloc minalign for this.
197  */
198 #define ARCH_DMA_MINALIGN L1_CACHE_BYTES
199 
200 #ifdef CONFIG_SUPERH64
201 /*
202  * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
203  * happily generate {ld/st}.q pairs, requiring us to have 8-byte
204  * alignment to avoid traps. The kmalloc alignment is guaranteed by
205  * virtue of L1_CACHE_BYTES, requiring this to only be special cased
206  * for slab caches.
207  */
208 #define ARCH_SLAB_MINALIGN 8
209 #endif
210 
211 #endif /* __ASM_SH_PAGE_H */