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_64KB)
16 # define PAGE_SHIFT 16
18 # error "Bogus kernel page size?"
21 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
22 #define PAGE_MASK (~(PAGE_SIZE-1))
23 #define PTE_MASK PAGE_MASK
25 /* to align the pointer to the (next) page boundary */
26 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
28 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
29 #define HPAGE_SHIFT 16
30 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
31 #define HPAGE_SHIFT 18
32 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
33 #define HPAGE_SHIFT 20
34 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
35 #define HPAGE_SHIFT 22
36 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
37 #define HPAGE_SHIFT 26
38 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
39 #define HPAGE_SHIFT 29
42 #ifdef CONFIG_HUGETLB_PAGE
43 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
44 #define HPAGE_MASK (~(HPAGE_SIZE-1))
45 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
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;
54 extern void clear_page(void *to);
55 extern void copy_page(void *to, void *from);
57 #if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
58 (defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
59 defined(CONFIG_SH7705_CACHE_32KB))
61 struct vm_area_struct;
62 extern void clear_user_page(void *to, unsigned long address, struct page *page);
63 extern void copy_user_page(void *to, void *from, unsigned long address,
65 #if defined(CONFIG_CPU_SH4)
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
71 #define clear_user_page(page, vaddr, pg) clear_page(page)
72 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
76 * These are used to make use of C type-checking..
79 typedef struct { unsigned long pte_low, pte_high; } pte_t;
80 typedef struct { unsigned long long pgprot; } pgprot_t;
81 typedef struct { unsigned long long pgd; } pgd_t;
83 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
85 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
86 #elif defined(CONFIG_SUPERH32)
87 typedef struct { unsigned long pte_low; } pte_t;
88 typedef struct { unsigned long pgprot; } pgprot_t;
89 typedef struct { unsigned long pgd; } pgd_t;
90 #define pte_val(x) ((x).pte_low)
91 #define __pte(x) ((pte_t) { (x) } )
93 typedef struct { unsigned long long pte_low; } pte_t;
94 typedef struct { unsigned long pgprot; } pgprot_t;
95 typedef struct { unsigned long pgd; } pgd_t;
96 #define pte_val(x) ((x).pte_low)
97 #define __pte(x) ((pte_t) { (x) } )
100 #define pgd_val(x) ((x).pgd)
101 #define pgprot_val(x) ((x).pgprot)
103 #define __pgd(x) ((pgd_t) { (x) } )
104 #define __pgprot(x) ((pgprot_t) { (x) } )
106 typedef struct page *pgtable_t;
108 #endif /* !__ASSEMBLY__ */
111 * __MEMORY_START and SIZE are the physical addresses and size of RAM.
113 #define __MEMORY_START CONFIG_MEMORY_START
114 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
117 * PAGE_OFFSET is the virtual address of the start of kernel address
120 #define PAGE_OFFSET CONFIG_PAGE_OFFSET
123 * Virtual to physical RAM address translation.
125 * In 29 bit mode, the physical offset of RAM from address 0 is visible in
126 * the kernel virtual address space, and thus we don't have to take
127 * this into account when translating. However in 32 bit mode this offset
128 * is not visible (it is part of the PMB mapping) and so needs to be
129 * added or subtracted as required.
132 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET+__MEMORY_START)
133 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET-__MEMORY_START))
135 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
136 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
139 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
140 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
143 * PFN = physical frame number (ie PFN 0 == physical address 0)
144 * PFN_START is the PFN of the first page of RAM. By defining this we
145 * don't have struct page entries for the portion of address space
146 * between physical address 0 and the start of RAM.
148 #define PFN_START (__MEMORY_START >> PAGE_SHIFT)
149 #define ARCH_PFN_OFFSET (PFN_START)
150 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
151 #ifdef CONFIG_FLATMEM
152 #define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
154 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
156 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
157 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
159 #include <asm-generic/memory_model.h>
160 #include <asm-generic/page.h>
163 #ifdef CONFIG_VSYSCALL
164 #define __HAVE_ARCH_GATE_AREA
168 * Some drivers need to perform DMA into kmalloc'ed buffers
169 * and so we have to increase the kmalloc minalign for this.
171 #define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
173 #ifdef CONFIG_SUPERH64
175 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still
176 * happily generate {ld/st}.q pairs, requiring us to have 8-byte
177 * alignment to avoid traps. The kmalloc alignment is gauranteed by
178 * virtue of L1_CACHE_BYTES, requiring this to only be special cased
181 #define ARCH_SLAB_MINALIGN 8
184 #endif /* __ASM_SH_PAGE_H */