Commit | Line | Data |
---|---|---|
3be80aae VG |
1 | /* |
2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #ifndef __ASM_ARC_PAGE_H | |
10 | #define __ASM_ARC_PAGE_H | |
11 | ||
12 | /* PAGE_SHIFT determines the page size */ | |
13 | #if defined(CONFIG_ARC_PAGE_SIZE_16K) | |
14 | #define PAGE_SHIFT 14 | |
15 | #elif defined(CONFIG_ARC_PAGE_SIZE_4K) | |
16 | #define PAGE_SHIFT 12 | |
17 | #else | |
18 | /* | |
19 | * Default 8k | |
20 | * done this way (instead of under CONFIG_ARC_PAGE_SIZE_8K) because adhoc | |
21 | * user code (busybox appletlib.h) expects PAGE_SHIFT to be defined w/o | |
22 | * using the correct uClibc header and in their build our autoconf.h is | |
23 | * not available | |
24 | */ | |
25 | #define PAGE_SHIFT 13 | |
26 | #endif | |
27 | ||
28 | #ifdef __ASSEMBLY__ | |
29 | #define PAGE_SIZE (1 << PAGE_SHIFT) | |
30 | #define PAGE_OFFSET (0x80000000) | |
31 | #else | |
32 | #define PAGE_SIZE (1UL << PAGE_SHIFT) /* Default 8K */ | |
33 | #define PAGE_OFFSET (0x80000000UL) /* Kernel starts at 2G onwards */ | |
34 | #endif | |
35 | ||
36 | #define PAGE_MASK (~(PAGE_SIZE-1)) | |
37 | ||
5dda4dc5 VG |
38 | #ifdef __KERNEL__ |
39 | ||
40 | #ifndef __ASSEMBLY__ | |
41 | ||
42 | #define get_user_page(vaddr) __get_free_page(GFP_KERNEL) | |
43 | #define free_user_page(page, addr) free_page(addr) | |
44 | ||
45 | /* TBD: for now don't worry about VIPT D$ aliasing */ | |
46 | #define clear_page(paddr) memset((paddr), 0, PAGE_SIZE) | |
47 | #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) | |
48 | ||
49 | #define clear_user_page(addr, vaddr, pg) clear_page(addr) | |
50 | #define copy_user_page(vto, vfrom, vaddr, pg) copy_page(vto, vfrom) | |
51 | ||
52 | #undef STRICT_MM_TYPECHECKS | |
53 | ||
54 | #ifdef STRICT_MM_TYPECHECKS | |
55 | /* | |
56 | * These are used to make use of C type-checking.. | |
57 | */ | |
58 | typedef struct { | |
59 | unsigned long pte; | |
60 | } pte_t; | |
61 | typedef struct { | |
62 | unsigned long pgd; | |
63 | } pgd_t; | |
64 | typedef struct { | |
65 | unsigned long pgprot; | |
66 | } pgprot_t; | |
67 | typedef unsigned long pgtable_t; | |
68 | ||
69 | #define pte_val(x) ((x).pte) | |
70 | #define pgd_val(x) ((x).pgd) | |
71 | #define pgprot_val(x) ((x).pgprot) | |
72 | ||
73 | #define __pte(x) ((pte_t) { (x) }) | |
74 | #define __pgd(x) ((pgd_t) { (x) }) | |
75 | #define __pgprot(x) ((pgprot_t) { (x) }) | |
76 | ||
77 | #else /* !STRICT_MM_TYPECHECKS */ | |
78 | ||
79 | typedef unsigned long pte_t; | |
80 | typedef unsigned long pgd_t; | |
81 | typedef unsigned long pgprot_t; | |
82 | typedef unsigned long pgtable_t; | |
83 | ||
84 | #define pte_val(x) (x) | |
85 | #define pgd_val(x) (x) | |
86 | #define pgprot_val(x) (x) | |
87 | #define __pte(x) (x) | |
88 | #define __pgprot(x) (x) | |
89 | ||
90 | #endif | |
91 | ||
92 | #define ARCH_PFN_OFFSET (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT) | |
93 | ||
94 | #define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr) | |
95 | ||
96 | /* | |
97 | * __pa, __va, virt_to_page (ALERT: deprecated, don't use them) | |
98 | * | |
99 | * These macros have historically been misnamed | |
100 | * virt here means link-address/program-address as embedded in object code. | |
101 | * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be | |
102 | * 128th page, and virt_to_page( ) will return the struct page corresp to it. | |
103 | * mem_map[ ] is an array of struct page for each page frame in the system | |
104 | * | |
105 | * Independent of where linux is linked at, link-addr = physical address | |
106 | * So the old macro __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE | |
107 | * would have been wrong in case kernel is not at 0x8zs | |
108 | */ | |
109 | #define __pa(vaddr) ((unsigned long)vaddr) | |
110 | #define __va(paddr) ((void *)((unsigned long)(paddr))) | |
111 | ||
112 | #define virt_to_page(kaddr) \ | |
113 | (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT)) | |
114 | ||
115 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
116 | ||
117 | /* Default Permissions for page, used in mmap.c */ | |
118 | #ifdef CONFIG_ARC_STACK_NONEXEC | |
119 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE) | |
120 | #else | |
121 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
122 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
123 | #endif | |
124 | ||
125 | #define WANT_PAGE_VIRTUAL 1 | |
126 | ||
127 | #include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */ | |
128 | #include <asm-generic/getorder.h> | |
129 | ||
3be80aae VG |
130 | #endif /* !__ASSEMBLY__ */ |
131 | ||
132 | #endif /* __KERNEL__ */ | |
133 | ||
134 | #endif |