1#ifndef __ASM_GENERIC_PAGE_H
2#define __ASM_GENERIC_PAGE_H
3/*
4 * Generic page.h implementation, for NOMMU architectures.
5 * This provides the dummy definitions for the memory management.
6 */
7
8#ifdef CONFIG_MMU
9#error need to prove a real asm/page.h
10#endif
11
12
13/* PAGE_SHIFT determines the page size */
14
15#define PAGE_SHIFT	12
16#ifdef __ASSEMBLY__
17#define PAGE_SIZE	(1 << PAGE_SHIFT)
18#else
19#define PAGE_SIZE	(1UL << PAGE_SHIFT)
20#endif
21#define PAGE_MASK	(~(PAGE_SIZE-1))
22
23#include <asm/setup.h>
24
25#ifndef __ASSEMBLY__
26
27#define get_user_page(vaddr)		__get_free_page(GFP_KERNEL)
28#define free_user_page(page, addr)	free_page(addr)
29
30#define clear_page(page)	memset((page), 0, PAGE_SIZE)
31#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
32
33#define clear_user_page(page, vaddr, pg)	clear_page(page)
34#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
35
36/*
37 * These are used to make use of C type-checking..
38 */
39typedef struct {
40	unsigned long pte;
41} pte_t;
42typedef struct {
43	unsigned long pmd[16];
44} pmd_t;
45typedef struct {
46	unsigned long pgd;
47} pgd_t;
48typedef struct {
49	unsigned long pgprot;
50} pgprot_t;
51typedef struct page *pgtable_t;
52
53#define pte_val(x)	((x).pte)
54#define pmd_val(x)	((&x)->pmd[0])
55#define pgd_val(x)	((x).pgd)
56#define pgprot_val(x)	((x).pgprot)
57
58#define __pte(x)	((pte_t) { (x) } )
59#define __pmd(x)	((pmd_t) { (x) } )
60#define __pgd(x)	((pgd_t) { (x) } )
61#define __pgprot(x)	((pgprot_t) { (x) } )
62
63extern unsigned long memory_start;
64extern unsigned long memory_end;
65
66#endif /* !__ASSEMBLY__ */
67
68#ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS
69#define PAGE_OFFSET		(CONFIG_KERNEL_RAM_BASE_ADDRESS)
70#else
71#define PAGE_OFFSET		(0)
72#endif
73
74#ifndef ARCH_PFN_OFFSET
75#define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
76#endif
77
78#ifndef __ASSEMBLY__
79
80#define __va(x) ((void *)((unsigned long) (x)))
81#define __pa(x) ((unsigned long) (x))
82
83#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
84#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)
85
86#define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))
87#define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))
88
89#ifndef page_to_phys
90#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
91#endif
92
93#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
94
95#define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
96				((void *)(kaddr) < (void *)memory_end))
97
98#endif /* __ASSEMBLY__ */
99
100#include <asm-generic/memory_model.h>
101#include <asm-generic/getorder.h>
102
103#endif /* __ASM_GENERIC_PAGE_H */
104