1 #ifndef __ASM_SH_PAGE_H
2 #define __ASM_SH_PAGE_H
5 * Copyright (C) 1999 Niibe Yutaka
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?"
22 #define PAGE_SIZE (1 << PAGE_SHIFT)
24 #define PAGE_SIZE (1UL << PAGE_SHIFT)
27 #define PAGE_MASK (~(PAGE_SIZE-1))
28 #define PTE_MASK PAGE_MASK
30 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
31 #define HPAGE_SHIFT 16
32 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
33 #define HPAGE_SHIFT 18
34 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
35 #define HPAGE_SHIFT 20
36 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
37 #define HPAGE_SHIFT 22
38 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
39 #define HPAGE_SHIFT 26
40 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
41 #define HPAGE_SHIFT 29
44 #ifdef CONFIG_HUGETLB_PAGE
45 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
46 #define HPAGE_MASK (~(HPAGE_SIZE-1))
47 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
52 extern unsigned long shm_align_mask;
53 extern unsigned long max_low_pfn, min_low_pfn;
54 extern unsigned long memory_start, memory_end;
56 extern void clear_page(void *to);
57 extern void copy_page(void *to, void *from);
59 #if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
60 (defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB))
62 struct vm_area_struct;
63 extern void clear_user_page(void *to, unsigned long address, struct page *page);
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 #endif /* !__ASSEMBLY__ */
107 /* to align the pointer to the (next) page boundary */
108 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
110 #define __MEMORY_START CONFIG_MEMORY_START
111 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
113 #define PAGE_OFFSET CONFIG_PAGE_OFFSET
114 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
115 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
116 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
118 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
120 /* PFN start number, because of __MEMORY_START */
121 #define PFN_START (__MEMORY_START >> PAGE_SHIFT)
122 #define ARCH_PFN_OFFSET (PFN_START)
123 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
124 #ifdef CONFIG_FLATMEM
125 #define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
127 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
129 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
130 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
132 #include <asm-generic/memory_model.h>
133 #include <asm-generic/page.h>
136 #ifdef CONFIG_VSYSCALL
137 #define __HAVE_ARCH_GATE_AREA
141 * Slub defaults to 8-byte alignment, we're only interested in 4.
142 * Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
144 #ifdef CONFIG_SUPERH32
145 #define ARCH_KMALLOC_MINALIGN 4
146 #define ARCH_SLAB_MINALIGN 4
148 /* If gcc inlines memset, it will use st.q instructions. Therefore, we need
149 kmalloc allocations to be 8-byte aligned. Without this, the alignment
150 becomes BYTE_PER_WORD i.e. only 4 (since sizeof(long)==sizeof(void*)==4 on
151 sh64 at the moment). */
152 #define ARCH_KMALLOC_MINALIGN 8
155 * We want 8-byte alignment for the slab caches as well, otherwise we have
156 * the same BYTES_PER_WORD (sizeof(void *)) min align in kmem_cache_create().
158 #define ARCH_SLAB_MINALIGN 8
161 #endif /* __KERNEL__ */
162 #endif /* __ASM_SH_PAGE_H */