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Linux kernel mirror (for testing)
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linux
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
49extern unsigned long shm_align_mask;
50extern unsigned long max_low_pfn, min_low_pfn;
51extern unsigned long memory_start, memory_end;
52
53extern void clear_page(void *to);
54extern void copy_page(void *to, void *from);
55
56#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
57 (defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
58 defined(CONFIG_SH7705_CACHE_32KB))
59struct page;
60struct vm_area_struct;
61extern void clear_user_page(void *to, unsigned long address, struct page *page);
62extern void copy_user_page(void *to, void *from, unsigned long address,
63 struct page *page);
64#if defined(CONFIG_CPU_SH4)
65extern void copy_user_highpage(struct page *to, struct page *from,
66 unsigned long vaddr, struct vm_area_struct *vma);
67#define __HAVE_ARCH_COPY_USER_HIGHPAGE
68#endif
69#else
70#define clear_user_page(page, vaddr, pg) clear_page(page)
71#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
72#endif
73
74/*
75 * These are used to make use of C type-checking..
76 */
77#ifdef CONFIG_X2TLB
78typedef struct { unsigned long pte_low, pte_high; } pte_t;
79typedef struct { unsigned long long pgprot; } pgprot_t;
80typedef struct { unsigned long long pgd; } pgd_t;
81#define pte_val(x) \
82 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
83#define __pte(x) \
84 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
85#elif defined(CONFIG_SUPERH32)
86typedef struct { unsigned long pte_low; } pte_t;
87typedef struct { unsigned long pgprot; } pgprot_t;
88typedef struct { unsigned long pgd; } pgd_t;
89#define pte_val(x) ((x).pte_low)
90#define __pte(x) ((pte_t) { (x) } )
91#else
92typedef struct { unsigned long long pte_low; } pte_t;
93typedef struct { unsigned long pgprot; } pgprot_t;
94typedef struct { unsigned long pgd; } pgd_t;
95#define pte_val(x) ((x).pte_low)
96#define __pte(x) ((pte_t) { (x) } )
97#endif
98
99#define pgd_val(x) ((x).pgd)
100#define pgprot_val(x) ((x).pgprot)
101
102#define __pgd(x) ((pgd_t) { (x) } )
103#define __pgprot(x) ((pgprot_t) { (x) } )
104
105typedef struct page *pgtable_t;
106
107#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
108
109#endif /* !__ASSEMBLY__ */
110
111/*
112 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
113 */
114#define __MEMORY_START CONFIG_MEMORY_START
115#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
116
117/*
118 * PAGE_OFFSET is the virtual address of the start of kernel address
119 * space.
120 */
121#define PAGE_OFFSET CONFIG_PAGE_OFFSET
122
123/*
124 * Virtual to physical RAM address translation.
125 *
126 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
127 * the kernel virtual address space, and thus we don't have to take
128 * this into account when translating. However in 32 bit mode this offset
129 * is not visible (it is part of the PMB mapping) and so needs to be
130 * added or subtracted as required.
131 */
132#ifdef CONFIG_32BIT
133#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
134#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
135#else
136#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
137#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
138#endif
139
140#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
141#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
142
143/*
144 * PFN = physical frame number (ie PFN 0 == physical address 0)
145 * PFN_START is the PFN of the first page of RAM. By defining this we
146 * don't have struct page entries for the portion of address space
147 * between physical address 0 and the start of RAM.
148 */
149#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
150#define ARCH_PFN_OFFSET (PFN_START)
151#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
152#ifdef CONFIG_FLATMEM
153#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
154#endif
155#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
156
157#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
158 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
159
160#include <asm-generic/memory_model.h>
161#include <asm-generic/page.h>
162
163/* vDSO support */
164#ifdef CONFIG_VSYSCALL
165#define __HAVE_ARCH_GATE_AREA
166#endif
167
168/*
169 * Some drivers need to perform DMA into kmalloc'ed buffers
170 * and so we have to increase the kmalloc minalign for this.
171 */
172#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
173
174#ifdef CONFIG_SUPERH64
175/*
176 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
177 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
178 * alignment to avoid traps. The kmalloc alignment is gauranteed by
179 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
180 * for slab caches.
181 */
182#define ARCH_SLAB_MINALIGN 8
183#endif
184
185#endif /* __ASM_SH_PAGE_H */