Merge branch 'genirq-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / powerpc / include / asm / page.h
1 #ifndef _ASM_POWERPC_PAGE_H
2 #define _ASM_POWERPC_PAGE_H
3
4 /*
5 * Copyright (C) 2001,2005 IBM Corporation.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 #ifndef __ASSEMBLY__
14 #include <linux/types.h>
15 #else
16 #include <asm/types.h>
17 #endif
18 #include <asm/asm-compat.h>
19 #include <asm/kdump.h>
20
21 /*
22 * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software
23 * page size. When using 64K pages however, whether we are really supporting
24 * 64K pages in HW or not is irrelevant to those definitions.
25 */
26 #ifdef CONFIG_PPC_64K_PAGES
27 #define PAGE_SHIFT 16
28 #else
29 #define PAGE_SHIFT 12
30 #endif
31
32 #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
33
34 /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
35 #define __HAVE_ARCH_GATE_AREA 1
36
37 /*
38 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
39 * assign PAGE_MASK to a larger type it gets extended the way we want
40 * (i.e. with 1s in the high bits)
41 */
42 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
43
44 /*
45 * KERNELBASE is the virtual address of the start of the kernel, it's often
46 * the same as PAGE_OFFSET, but _might not be_.
47 *
48 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
49 *
50 * PAGE_OFFSET is the virtual address of the start of lowmem.
51 *
52 * PHYSICAL_START is the physical address of the start of the kernel.
53 *
54 * MEMORY_START is the physical address of the start of lowmem.
55 *
56 * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
57 * ppc32 and based on how they are set we determine MEMORY_START.
58 *
59 * For the linear mapping the following equation should be true:
60 * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
61 *
62 * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
63 *
64 * There are two was to determine a physical address from a virtual one:
65 * va = pa + PAGE_OFFSET - MEMORY_START
66 * va = pa + KERNELBASE - PHYSICAL_START
67 *
68 * If you want to know something's offset from the start of the kernel you
69 * should subtract KERNELBASE.
70 *
71 * If you want to test if something's a kernel address, use is_kernel_addr().
72 */
73
74 #define KERNELBASE ASM_CONST(CONFIG_KERNEL_START)
75 #define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET)
76 #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))
77
78 #if defined(CONFIG_RELOCATABLE)
79 #ifndef __ASSEMBLY__
80 extern phys_addr_t memstart_addr;
81 extern phys_addr_t kernstart_addr;
82 #endif
83 #define PHYSICAL_START kernstart_addr
84 #else
85 #define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START)
86 #endif
87
88 #ifdef CONFIG_PPC64
89 #define MEMORY_START 0UL
90 #elif defined(CONFIG_RELOCATABLE)
91 #define MEMORY_START memstart_addr
92 #else
93 #define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
94 #endif
95
96 #ifdef CONFIG_FLATMEM
97 #define ARCH_PFN_OFFSET (MEMORY_START >> PAGE_SHIFT)
98 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr))
99 #endif
100
101 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
102 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
103 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
104
105 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - MEMORY_START))
106 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START)
107
108 /*
109 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
110 * and needs to be executable. This means the whole heap ends
111 * up being executable.
112 */
113 #define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
114 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
115
116 #define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
117 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
118
119 #ifdef __powerpc64__
120 #include <asm/page_64.h>
121 #else
122 #include <asm/page_32.h>
123 #endif
124
125 /* align addr on a size boundary - adjust address up/down if needed */
126 #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
127 #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
128
129 /* align addr on a size boundary - adjust address up if needed */
130 #define _ALIGN(addr,size) _ALIGN_UP(addr,size)
131
132 /*
133 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
134 * "kernelness", use is_kernel_addr() - it should do what you want.
135 */
136 #define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
137
138 #ifndef __ASSEMBLY__
139
140 #undef STRICT_MM_TYPECHECKS
141
142 #ifdef STRICT_MM_TYPECHECKS
143 /* These are used to make use of C type-checking. */
144
145 /* PTE level */
146 typedef struct { pte_basic_t pte; } pte_t;
147 #define pte_val(x) ((x).pte)
148 #define __pte(x) ((pte_t) { (x) })
149
150 /* 64k pages additionally define a bigger "real PTE" type that gathers
151 * the "second half" part of the PTE for pseudo 64k pages
152 */
153 #ifdef CONFIG_PPC_64K_PAGES
154 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
155 #else
156 typedef struct { pte_t pte; } real_pte_t;
157 #endif
158
159 /* PMD level */
160 #ifdef CONFIG_PPC64
161 typedef struct { unsigned long pmd; } pmd_t;
162 #define pmd_val(x) ((x).pmd)
163 #define __pmd(x) ((pmd_t) { (x) })
164
165 /* PUD level exusts only on 4k pages */
166 #ifndef CONFIG_PPC_64K_PAGES
167 typedef struct { unsigned long pud; } pud_t;
168 #define pud_val(x) ((x).pud)
169 #define __pud(x) ((pud_t) { (x) })
170 #endif /* !CONFIG_PPC_64K_PAGES */
171 #endif /* CONFIG_PPC64 */
172
173 /* PGD level */
174 typedef struct { unsigned long pgd; } pgd_t;
175 #define pgd_val(x) ((x).pgd)
176 #define __pgd(x) ((pgd_t) { (x) })
177
178 /* Page protection bits */
179 typedef struct { unsigned long pgprot; } pgprot_t;
180 #define pgprot_val(x) ((x).pgprot)
181 #define __pgprot(x) ((pgprot_t) { (x) })
182
183 #else
184
185 /*
186 * .. while these make it easier on the compiler
187 */
188
189 typedef pte_basic_t pte_t;
190 #define pte_val(x) (x)
191 #define __pte(x) (x)
192
193 #ifdef CONFIG_PPC_64K_PAGES
194 typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
195 #else
196 typedef unsigned long real_pte_t;
197 #endif
198
199
200 #ifdef CONFIG_PPC64
201 typedef unsigned long pmd_t;
202 #define pmd_val(x) (x)
203 #define __pmd(x) (x)
204
205 #ifndef CONFIG_PPC_64K_PAGES
206 typedef unsigned long pud_t;
207 #define pud_val(x) (x)
208 #define __pud(x) (x)
209 #endif /* !CONFIG_PPC_64K_PAGES */
210 #endif /* CONFIG_PPC64 */
211
212 typedef unsigned long pgd_t;
213 #define pgd_val(x) (x)
214 #define pgprot_val(x) (x)
215
216 typedef unsigned long pgprot_t;
217 #define __pgd(x) (x)
218 #define __pgprot(x) (x)
219
220 #endif
221
222 struct page;
223 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
224 extern void copy_user_page(void *to, void *from, unsigned long vaddr,
225 struct page *p);
226 extern int page_is_ram(unsigned long pfn);
227
228 struct vm_area_struct;
229
230 typedef struct page *pgtable_t;
231
232 #include <asm-generic/memory_model.h>
233 #endif /* __ASSEMBLY__ */
234
235 #endif /* _ASM_POWERPC_PAGE_H */