1 #ifndef __ASM_SH_PAGE_H
2 #define __ASM_SH_PAGE_H
5 * Copyright (C) 1999 Niibe Yutaka
8 #include <linux/const.h>
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
20 # error "Bogus kernel page size?"
23 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
24 #define PAGE_MASK (~(PAGE_SIZE-1))
25 #define PTE_MASK PAGE_MASK
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
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)
48 #include <asm/uncached.h>
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;
54 static inline unsigned long
55 pages_do_alias(unsigned long addr1, unsigned long addr2)
57 return (addr1 ^ addr2) & shm_align_mask;
60 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
61 extern void copy_page(void *to, void *from);
64 struct vm_area_struct;
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
73 * These are used to make use of C type-checking..
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;
80 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
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) } )
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) } )
97 #define pgd_val(x) ((x).pgd)
98 #define pgprot_val(x) ((x).pgprot)
100 #define __pgd(x) ((pgd_t) { (x) } )
101 #define __pgprot(x) ((pgprot_t) { (x) } )
103 typedef struct page *pgtable_t;
105 #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
107 #endif /* !__ASSEMBLY__ */
110 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
112 #define __MEMORY_START CONFIG_MEMORY_START
113 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
116 * PAGE_OFFSET is the virtual address of the start of kernel address
119 #define PAGE_OFFSET CONFIG_PAGE_OFFSET
122 * Virtual to physical RAM address translation.
124 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
125 * the kernel virtual address space, and thus we don't have to take
126 * this into account when translating. However in 32 bit mode this offset
127 * is not visible (it is part of the PMB mapping) and so needs to be
128 * added or subtracted as required.
131 #define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START)
132 #define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START)
134 #define ___pa(x) ((x)-PAGE_OFFSET)
135 #define ___va(x) ((x)+PAGE_OFFSET)
139 #define __pa(x) ___pa((unsigned long)x)
140 #define __va(x) (void *)___va((unsigned long)x)
141 #endif /* !__ASSEMBLY__ */
143 #ifdef CONFIG_UNCACHED_MAPPING
144 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start)
145 #define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET)
147 #define UNCAC_ADDR(addr) ((addr))
148 #define CAC_ADDR(addr) ((addr))
151 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
152 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
155 * PFN = physical frame number (ie PFN 0 == physical address 0)
156 * PFN_START is the PFN of the first page of RAM. By defining this we
157 * don't have struct page entries for the portion of address space
158 * between physical address 0 and the start of RAM.
160 #define PFN_START (__MEMORY_START >> PAGE_SHIFT)
161 #define ARCH_PFN_OFFSET (PFN_START)
162 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
163 #ifdef CONFIG_FLATMEM
164 #define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
166 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
168 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
169 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
171 #include <asm-generic/memory_model.h>
172 #include <asm-generic/getorder.h>
175 #ifdef CONFIG_VSYSCALL
176 #define __HAVE_ARCH_GATE_AREA
180 * Some drivers need to perform DMA into kmalloc'ed buffers
181 * and so we have to increase the kmalloc minalign for this.
183 #define ARCH_DMA_MINALIGN L1_CACHE_BYTES
185 #ifdef CONFIG_SUPERH64
187 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
188 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
189 * alignment to avoid traps. The kmalloc alignment is gauranteed by
190 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
193 #define ARCH_SLAB_MINALIGN 8
196 #endif /* __ASM_SH_PAGE_H */