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1da177e4 LT |
1 | #ifndef _PPC_PAGE_H |
2 | #define _PPC_PAGE_H | |
3 | ||
4 | /* PAGE_SHIFT determines the page size */ | |
5 | #define PAGE_SHIFT 12 | |
6 | #define PAGE_SIZE (1UL << PAGE_SHIFT) | |
7 | ||
8 | /* | |
9 | * Subtle: this is an int (not an unsigned long) and so it | |
10 | * gets extended to 64 bits the way want (i.e. with 1s). -- paulus | |
11 | */ | |
12 | #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) | |
13 | ||
14 | #ifdef __KERNEL__ | |
15 | #include <linux/config.h> | |
16 | ||
17 | /* This must match what is in arch/ppc/Makefile */ | |
18 | #define PAGE_OFFSET CONFIG_KERNEL_START | |
19 | #define KERNELBASE PAGE_OFFSET | |
20 | ||
21 | #ifndef __ASSEMBLY__ | |
22 | ||
23 | /* | |
24 | * The basic type of a PTE - 64 bits for those CPUs with > 32 bit | |
25 | * physical addressing. For now this just the IBM PPC440. | |
26 | */ | |
27 | #ifdef CONFIG_PTE_64BIT | |
28 | typedef unsigned long long pte_basic_t; | |
29 | #define PTE_SHIFT (PAGE_SHIFT - 3) /* 512 ptes per page */ | |
30 | #define PTE_FMT "%16Lx" | |
31 | #else | |
32 | typedef unsigned long pte_basic_t; | |
33 | #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ | |
34 | #define PTE_FMT "%.8lx" | |
35 | #endif | |
36 | ||
37 | #undef STRICT_MM_TYPECHECKS | |
38 | ||
39 | #ifdef STRICT_MM_TYPECHECKS | |
40 | /* | |
41 | * These are used to make use of C type-checking.. | |
42 | */ | |
43 | typedef struct { pte_basic_t pte; } pte_t; | |
44 | typedef struct { unsigned long pmd; } pmd_t; | |
45 | typedef struct { unsigned long pgd; } pgd_t; | |
46 | typedef struct { unsigned long pgprot; } pgprot_t; | |
47 | ||
48 | #define pte_val(x) ((x).pte) | |
49 | #define pmd_val(x) ((x).pmd) | |
50 | #define pgd_val(x) ((x).pgd) | |
51 | #define pgprot_val(x) ((x).pgprot) | |
52 | ||
53 | #define __pte(x) ((pte_t) { (x) } ) | |
54 | #define __pmd(x) ((pmd_t) { (x) } ) | |
55 | #define __pgd(x) ((pgd_t) { (x) } ) | |
56 | #define __pgprot(x) ((pgprot_t) { (x) } ) | |
57 | ||
58 | #else | |
59 | /* | |
60 | * .. while these make it easier on the compiler | |
61 | */ | |
62 | typedef pte_basic_t pte_t; | |
63 | typedef unsigned long pmd_t; | |
64 | typedef unsigned long pgd_t; | |
65 | typedef unsigned long pgprot_t; | |
66 | ||
67 | #define pte_val(x) (x) | |
68 | #define pmd_val(x) (x) | |
69 | #define pgd_val(x) (x) | |
70 | #define pgprot_val(x) (x) | |
71 | ||
72 | #define __pte(x) (x) | |
73 | #define __pmd(x) (x) | |
74 | #define __pgd(x) (x) | |
75 | #define __pgprot(x) (x) | |
76 | ||
77 | #endif | |
78 | ||
79 | ||
80 | /* align addr on a size boundary - adjust address up if needed -- Cort */ | |
81 | #define _ALIGN(addr,size) (((addr)+(size)-1)&(~((size)-1))) | |
82 | ||
83 | /* to align the pointer to the (next) page boundary */ | |
84 | #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) | |
85 | ||
86 | struct page; | |
87 | extern void clear_pages(void *page, int order); | |
88 | static inline void clear_page(void *page) { clear_pages(page, 0); } | |
89 | extern void copy_page(void *to, void *from); | |
90 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); | |
91 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, | |
92 | struct page *pg); | |
93 | ||
94 | #ifndef CONFIG_APUS | |
95 | #define PPC_MEMSTART 0 | |
96 | #define PPC_PGSTART 0 | |
97 | #define PPC_MEMOFFSET PAGE_OFFSET | |
98 | #else | |
99 | extern unsigned long ppc_memstart; | |
100 | extern unsigned long ppc_pgstart; | |
101 | extern unsigned long ppc_memoffset; | |
102 | #define PPC_MEMSTART ppc_memstart | |
103 | #define PPC_PGSTART ppc_pgstart | |
104 | #define PPC_MEMOFFSET ppc_memoffset | |
105 | #endif | |
106 | ||
107 | #if defined(CONFIG_APUS) && !defined(MODULE) | |
108 | /* map phys->virtual and virtual->phys for RAM pages */ | |
109 | static inline unsigned long ___pa(unsigned long v) | |
110 | { | |
111 | unsigned long p; | |
112 | asm volatile ("1: addis %0, %1, %2;" | |
113 | ".section \".vtop_fixup\",\"aw\";" | |
114 | ".align 1;" | |
115 | ".long 1b;" | |
116 | ".previous;" | |
117 | : "=r" (p) | |
118 | : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff)); | |
119 | ||
120 | return p; | |
121 | } | |
122 | static inline void* ___va(unsigned long p) | |
123 | { | |
124 | unsigned long v; | |
125 | asm volatile ("1: addis %0, %1, %2;" | |
126 | ".section \".ptov_fixup\",\"aw\";" | |
127 | ".align 1;" | |
128 | ".long 1b;" | |
129 | ".previous;" | |
130 | : "=r" (v) | |
131 | : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff)); | |
132 | ||
133 | return (void*) v; | |
134 | } | |
135 | #else | |
136 | #define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET) | |
137 | #define ___va(paddr) ((paddr)+PPC_MEMOFFSET) | |
138 | #endif | |
139 | ||
140 | extern int page_is_ram(unsigned long pfn); | |
141 | ||
142 | #define __pa(x) ___pa((unsigned long)(x)) | |
143 | #define __va(x) ((void *)(___va((unsigned long)(x)))) | |
144 | ||
145 | #define pfn_to_page(pfn) (mem_map + ((pfn) - PPC_PGSTART)) | |
146 | #define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PPC_PGSTART) | |
147 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
148 | #define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) | |
149 | ||
150 | #define pfn_valid(pfn) (((pfn) - PPC_PGSTART) < max_mapnr) | |
151 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
152 | ||
153 | /* Pure 2^n version of get_order */ | |
154 | extern __inline__ int get_order(unsigned long size) | |
155 | { | |
156 | int lz; | |
157 | ||
158 | size = (size-1) >> PAGE_SHIFT; | |
159 | asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size)); | |
160 | return 32 - lz; | |
161 | } | |
162 | ||
163 | #endif /* __ASSEMBLY__ */ | |
164 | ||
165 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ | |
166 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
167 | ||
168 | #endif /* __KERNEL__ */ | |
169 | #endif /* _PPC_PAGE_H */ |