1 #ifndef _ASM_M32R_PAGE_H
2 #define _ASM_M32R_PAGE_H
4 #include <linux/config.h>
6 /* PAGE_SHIFT determines the page size */
8 #define PAGE_SIZE (1UL << PAGE_SHIFT)
9 #define PAGE_MASK (~(PAGE_SIZE-1))
14 extern void clear_page(void *to);
15 extern void copy_page(void *to, void *from);
17 #define clear_user_page(page, vaddr, pg) clear_page(page)
18 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
21 * These are used to make use of C type-checking..
23 typedef struct { unsigned long pte; } pte_t;
24 typedef struct { unsigned long pmd; } pmd_t;
25 typedef struct { unsigned long pgd; } pgd_t;
26 #define pte_val(x) ((x).pte)
27 #define PTE_MASK PAGE_MASK
29 typedef struct { unsigned long pgprot; } pgprot_t;
31 #define pmd_val(x) ((x).pmd)
32 #define pgd_val(x) ((x).pgd)
33 #define pgprot_val(x) ((x).pgprot)
35 #define __pte(x) ((pte_t) { (x) } )
36 #define __pmd(x) ((pmd_t) { (x) } )
37 #define __pgd(x) ((pgd_t) { (x) } )
38 #define __pgprot(x) ((pgprot_t) { (x) } )
40 #endif /* !__ASSEMBLY__ */
42 /* to align the pointer to the (next) page boundary */
43 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
46 * This handles the memory map.. We could make this a config
47 * option, but too many people screw it up, and too few need
50 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
51 * a virtual address space of one gigabyte, which limits the
52 * amount of physical memory you can use to about 950MB.
54 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
55 * and CONFIG_HIGHMEM64G options in the kernel configuration.
59 /* This handles the memory map.. */
63 /* Pure 2^n version of get_order */
64 static __inline__ int get_order(unsigned long size)
68 size = (size - 1) >> (PAGE_SHIFT - 1);
78 #endif /* __ASSEMBLY__ */
80 #define __MEMORY_START CONFIG_MEMORY_START
81 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE
84 #define __PAGE_OFFSET (0x80000000)
86 #define __PAGE_OFFSET (0x00000000)
89 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
90 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
91 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
93 #ifndef CONFIG_DISCONTIGMEM
94 #define PFN_BASE (CONFIG_MEMORY_START >> PAGE_SHIFT)
95 #define pfn_to_page(pfn) (mem_map + ((pfn) - PFN_BASE))
96 #define page_to_pfn(page) \
97 ((unsigned long)((page) - mem_map) + PFN_BASE)
98 #define pfn_valid(pfn) (((pfn) - PFN_BASE) < max_mapnr)
99 #endif /* !CONFIG_DISCONTIGMEM */
101 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
102 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
104 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
105 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC )
107 #define devmem_is_allowed(x) 1
109 #endif /* __KERNEL__ */
111 #endif /* _ASM_M32R_PAGE_H */