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)
49 extern unsigned long shm_align_mask;
50 extern unsigned long max_low_pfn, min_low_pfn;
51 extern unsigned long memory_start, memory_end;
53 extern void clear_page(void *to);
54 extern void copy_page(void *to, void *from);
56 #if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
57 (defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
58 defined(CONFIG_SH7705_CACHE_32KB))
60 struct vm_area_struct;
61 extern void clear_user_page(void *to, unsigned long address, struct page *page);
62 extern void copy_user_page(void *to, void *from, unsigned long address,
64 #if defined(CONFIG_CPU_SH4)
65 extern 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
70 #define clear_user_page(page, vaddr, pg) clear_page(page)
71 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
75 * These are used to make use of C type-checking..
78 typedef struct { unsigned long pte_low, pte_high; } pte_t;
79 typedef struct { unsigned long long pgprot; } pgprot_t;
80 typedef struct { unsigned long long pgd; } pgd_t;
82 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
84 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
85 #elif defined(CONFIG_SUPERH32)
86 typedef struct { unsigned long pte_low; } pte_t;
87 typedef struct { unsigned long pgprot; } pgprot_t;
88 typedef struct { unsigned long pgd; } pgd_t;
89 #define pte_val(x) ((x).pte_low)
90 #define __pte(x) ((pte_t) { (x) } )
92 typedef struct { unsigned long long pte_low; } pte_t;
93 typedef struct { unsigned long pgprot; } pgprot_t;
94 typedef struct { unsigned long pgd; } pgd_t;
95 #define pte_val(x) ((x).pte_low)
96 #define __pte(x) ((pte_t) { (x) } )
99 #define pgd_val(x) ((x).pgd)
100 #define pgprot_val(x) ((x).pgprot)
102 #define __pgd(x) ((pgd_t) { (x) } )
103 #define __pgprot(x) ((pgprot_t) { (x) } )
105 typedef struct page *pgtable_t;
107 #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
109 #endif /* !__ASSEMBLY__ */
112 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
114 #define __MEMORY_START CONFIG_MEMORY_START
115 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
118 * PAGE_OFFSET is the virtual address of the start of kernel address
121 #define PAGE_OFFSET CONFIG_PAGE_OFFSET
124 * Virtual to physical RAM address translation.
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.
133 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
134 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
136 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
137 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
140 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
141 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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.
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)
155 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
157 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
158 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
160 #include <asm-generic/memory_model.h>
161 #include <asm-generic/page.h>
164 #ifdef CONFIG_VSYSCALL
165 #define __HAVE_ARCH_GATE_AREA
169 * Some drivers need to perform DMA into kmalloc'ed buffers
170 * and so we have to increase the kmalloc minalign for this.
172 #define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
174 #ifdef CONFIG_SUPERH64
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
182 #define ARCH_SLAB_MINALIGN 8
185 #endif /* __ASM_SH_PAGE_H */