1 #ifndef __ASM_SH_PAGE_H
2 #define __ASM_SH_PAGE_H
5 * Copyright (C) 1999 Niibe Yutaka
9 [ P0/U0 (virtual) ] 0x00000000 <------ User space
10 [ P1 (fixed) cached ] 0x80000000 <------ Kernel space
11 [ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
12 [ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
13 [ P4 control ] 0xE0000000
18 /* PAGE_SHIFT determines the page size */
19 #if defined(CONFIG_PAGE_SIZE_4KB)
20 # define PAGE_SHIFT 12
21 #elif defined(CONFIG_PAGE_SIZE_8KB)
22 # define PAGE_SHIFT 13
23 #elif defined(CONFIG_PAGE_SIZE_64KB)
24 # define PAGE_SHIFT 16
26 # error "Bogus kernel page size?"
30 #define PAGE_SIZE (1 << PAGE_SHIFT)
32 #define PAGE_SIZE (1UL << PAGE_SHIFT)
35 #define PAGE_MASK (~(PAGE_SIZE-1))
36 #define PTE_MASK PAGE_MASK
38 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
39 #define HPAGE_SHIFT 16
40 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
41 #define HPAGE_SHIFT 18
42 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
43 #define HPAGE_SHIFT 20
44 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
45 #define HPAGE_SHIFT 22
46 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
47 #define HPAGE_SHIFT 26
50 #ifdef CONFIG_HUGETLB_PAGE
51 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
52 #define HPAGE_MASK (~(HPAGE_SIZE-1))
53 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
58 extern void (*clear_page)(void *to);
59 extern void (*copy_page)(void *to, void *from);
61 extern unsigned long shm_align_mask;
62 extern unsigned long max_low_pfn, min_low_pfn;
63 extern unsigned long memory_start, memory_end;
66 extern void clear_page_slow(void *to);
67 extern void copy_page_slow(void *to, void *from);
69 extern void clear_page_nommu(void *to);
70 extern void copy_page_nommu(void *to, void *from);
73 #if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
74 (defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB))
76 struct vm_area_struct;
77 extern void clear_user_page(void *to, unsigned long address, struct page *page);
79 extern void copy_user_highpage(struct page *to, struct page *from,
80 unsigned long vaddr, struct vm_area_struct *vma);
81 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
84 #define clear_user_page(page, vaddr, pg) clear_page(page)
85 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
89 * These are used to make use of C type-checking..
92 typedef struct { unsigned long pte_low, pte_high; } pte_t;
93 typedef struct { unsigned long long pgprot; } pgprot_t;
94 typedef struct { unsigned long long pgd; } pgd_t;
96 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
98 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
99 #elif defined(CONFIG_SUPERH32)
100 typedef struct { unsigned long pte_low; } pte_t;
101 typedef struct { unsigned long pgprot; } pgprot_t;
102 typedef struct { unsigned long pgd; } pgd_t;
103 #define pte_val(x) ((x).pte_low)
104 #define __pte(x) ((pte_t) { (x) } )
106 typedef struct { unsigned long long pte_low; } pte_t;
107 typedef struct { unsigned long pgprot; } pgprot_t;
108 typedef struct { unsigned long pgd; } pgd_t;
109 #define pte_val(x) ((x).pte_low)
110 #define __pte(x) ((pte_t) { (x) } )
113 #define pgd_val(x) ((x).pgd)
114 #define pgprot_val(x) ((x).pgprot)
116 #define __pgd(x) ((pgd_t) { (x) } )
117 #define __pgprot(x) ((pgprot_t) { (x) } )
119 #endif /* !__ASSEMBLY__ */
121 /* to align the pointer to the (next) page boundary */
122 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
125 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
127 * arch/sh/kernel/vmlinux.lds.S
129 * which has the same constant encoded..
132 #define __MEMORY_START CONFIG_MEMORY_START
133 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
135 #define PAGE_OFFSET CONFIG_PAGE_OFFSET
136 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
137 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
138 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
140 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
142 /* PFN start number, because of __MEMORY_START */
143 #define PFN_START (__MEMORY_START >> PAGE_SHIFT)
144 #define ARCH_PFN_OFFSET (PFN_START)
145 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
146 #ifdef CONFIG_FLATMEM
147 #define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
149 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
151 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
152 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
154 #include <asm-generic/memory_model.h>
155 #include <asm-generic/page.h>
158 #ifdef CONFIG_VSYSCALL
159 #define __HAVE_ARCH_GATE_AREA
163 * Slub defaults to 8-byte alignment, we're only interested in 4.
164 * Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
166 #ifdef CONFIG_SUPERH32
167 #define ARCH_KMALLOC_MINALIGN 4
168 #define ARCH_SLAB_MINALIGN 4
170 /* If gcc inlines memset, it will use st.q instructions. Therefore, we need
171 kmalloc allocations to be 8-byte aligned. Without this, the alignment
172 becomes BYTE_PER_WORD i.e. only 4 (since sizeof(long)==sizeof(void*)==4 on
173 sh64 at the moment). */
174 #define ARCH_KMALLOC_MINALIGN 8
177 * We want 8-byte alignment for the slab caches as well, otherwise we have
178 * the same BYTES_PER_WORD (sizeof(void *)) min align in kmem_cache_create().
180 #define ARCH_SLAB_MINALIGN 8
183 #endif /* __KERNEL__ */
184 #endif /* __ASM_SH_PAGE_H */