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 extern void clear_user_page(void *to
, unsigned long address
, struct page
*pg
);
77 extern void copy_user_page(void *to
, void *from
, unsigned long address
, struct page
*pg
);
78 extern void __clear_user_page(void *to
, void *orig_to
);
79 extern void __copy_user_page(void *to
, void *from
, void *orig_to
);
81 #define clear_user_page(page, vaddr, pg) clear_page(page)
82 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
86 * These are used to make use of C type-checking..
89 typedef struct { unsigned long pte_low
, pte_high
; } pte_t
;
90 typedef struct { unsigned long long pgprot
; } pgprot_t
;
91 typedef struct { unsigned long long pgd
; } pgd_t
;
93 ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
95 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
97 typedef struct { unsigned long pte_low
; } pte_t
;
98 typedef struct { unsigned long pgprot
; } pgprot_t
;
99 typedef struct { unsigned long pgd
; } pgd_t
;
100 #define pte_val(x) ((x).pte_low)
101 #define __pte(x) ((pte_t) { (x) } )
104 #define pgd_val(x) ((x).pgd)
105 #define pgprot_val(x) ((x).pgprot)
107 #define __pgd(x) ((pgd_t) { (x) } )
108 #define __pgprot(x) ((pgprot_t) { (x) } )
110 #endif /* !__ASSEMBLY__ */
112 /* to align the pointer to the (next) page boundary */
113 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
116 * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
118 * arch/sh/kernel/vmlinux.lds.S
120 * which has the same constant encoded..
123 #define __MEMORY_START CONFIG_MEMORY_START
124 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
126 #define PAGE_OFFSET CONFIG_PAGE_OFFSET
127 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
128 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
129 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
131 #define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
132 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
134 /* PFN start number, because of __MEMORY_START */
135 #define PFN_START (__MEMORY_START >> PAGE_SHIFT)
136 #define ARCH_PFN_OFFSET (PFN_START)
137 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
138 #ifdef CONFIG_FLATMEM
139 #define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
141 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
143 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
144 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
146 #include <asm-generic/memory_model.h>
147 #include <asm-generic/page.h>
150 #ifdef CONFIG_VSYSCALL
151 #define __HAVE_ARCH_GATE_AREA
155 * Slub defaults to 8-byte alignment, we're only interested in 4.
156 * Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
158 #define ARCH_KMALLOC_MINALIGN 4
159 #define ARCH_SLAB_MINALIGN 4
161 #endif /* __KERNEL__ */
162 #endif /* __ASM_SH_PAGE_H */