xref: /linux/arch/nios2/include/asm/page.h (revision fcb3ad4366b9c810cbb9da34c076a9a52d8aa1e0)
1 /*
2  * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
3  * Copyright (C) 2004 Microtronix Datacom Ltd.
4  *
5  * MMU support based on asm/page.h from mips which is:
6  *
7  * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9  *
10  * This file is subject to the terms and conditions of the GNU General Public
11  * License.  See the file "COPYING" in the main directory of this archive
12  * for more details.
13  */
14 
15 #ifndef _ASM_NIOS2_PAGE_H
16 #define _ASM_NIOS2_PAGE_H
17 
18 #include <linux/pfn.h>
19 #include <linux/const.h>
20 
21 #include <vdso/page.h>
22 
23 /*
24  * PAGE_OFFSET -- the first address of the first page of memory.
25  */
26 #define PAGE_OFFSET	\
27 	(CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE)
28 
29 #ifndef __ASSEMBLY__
30 
31 /*
32  * This gives the physical RAM offset.
33  */
34 #define PHYS_OFFSET		CONFIG_NIOS2_MEM_BASE
35 
36 /*
37  * It's normally defined only for FLATMEM config but it's
38  * used in our early mem init code for all memory models.
39  * So always define it.
40  */
41 #define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)
42 
43 #define clear_page(page)	memset((page), 0, PAGE_SIZE)
44 #define copy_page(to, from)	memcpy((to), (from), PAGE_SIZE)
45 
46 struct page;
47 
48 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
49 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
50 				struct page *to);
51 
52 /*
53  * These are used to make use of C type-checking.
54  */
55 typedef struct page *pgtable_t;
56 typedef struct { unsigned long pte; } pte_t;
57 typedef struct { unsigned long pgd; } pgd_t;
58 typedef struct { unsigned long pgprot; } pgprot_t;
59 
60 #define pte_val(x)	((x).pte)
61 #define pgd_val(x)	((x).pgd)
62 #define pgprot_val(x)	((x).pgprot)
63 
64 #define __pte(x)	((pte_t) { (x) })
65 #define __pgd(x)	((pgd_t) { (x) })
66 #define __pgprot(x)	((pgprot_t) { (x) })
67 
68 extern unsigned long memory_start;
69 extern unsigned long memory_end;
70 extern unsigned long memory_size;
71 
72 extern struct page *mem_map;
73 
74 # define __pa(x)		\
75 	((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
76 # define __va(x)		\
77 	((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
78 
79 #define page_to_virt(page)	\
80 	((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
81 
82 # define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
83 
84 # define virt_to_page(vaddr)	pfn_to_page(PFN_DOWN(virt_to_phys(vaddr)))
85 # define virt_addr_valid(vaddr)	pfn_valid(PFN_DOWN(virt_to_phys(vaddr)))
86 
87 # define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
88 
89 #include <asm-generic/memory_model.h>
90 
91 #include <asm-generic/getorder.h>
92 
93 #endif /* !__ASSEMBLY__ */
94 
95 #endif /* _ASM_NIOS2_PAGE_H */
96