aboutsummaryrefslogtreecommitdiff
path: root/include/asm-powerpc/page.h
blob: 61e3725bbd37e18eae791ed2b3cf36e3d045b2eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
#ifndef _ASM_POWERPC_PAGE_H
#define _ASM_POWERPC_PAGE_H

/*
 * Copyright (C) 2001,2005 IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <asm/asm-compat.h>
#include <asm/kdump.h>

/*
 * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software
 * page size. When using 64K pages however, whether we are really supporting
 * 64K pages in HW or not is irrelevant to those definitions.
 */
#ifdef CONFIG_PPC_64K_PAGES
#define PAGE_SHIFT		16
#else
#define PAGE_SHIFT		12
#endif

#define PAGE_SIZE		(ASM_CONST(1) << PAGE_SHIFT)

/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
#define __HAVE_ARCH_GATE_AREA		1

/*
 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
 * assign PAGE_MASK to a larger type it gets extended the way we want
 * (i.e. with 1s in the high bits)
 */
#define PAGE_MASK      (~((1 << PAGE_SHIFT) - 1))

/*
 * KERNELBASE is the virtual address of the start of the kernel, it's often
 * the same as PAGE_OFFSET, but _might not be_.
 *
 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
 *
 * To get a physical address from a virtual one you subtract PAGE_OFFSET,
 * _not_ KERNELBASE.
 *
 * If you want to know something's offset from the start of the kernel you
 * should subtract KERNELBASE.
 *
 * If you want to test if something's a kernel address, use is_kernel_addr().
 */

#define PAGE_OFFSET     ASM_CONST(CONFIG_KERNEL_START)
#define KERNELBASE      (PAGE_OFFSET + PHYSICAL_START)

#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn)		((pfn) < max_mapnr)
#endif

#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)

/*
 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
 * and needs to be executable.  This means the whole heap ends
 * up being executable.
 */
#define VM_DATA_DEFAULT_FLAGS32	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define VM_DATA_DEFAULT_FLAGS64	(VM_READ | VM_WRITE | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#ifdef __powerpc64__
#include <asm/page_64.h>
#else
#include <asm/page_32.h>
#endif

/* align addr on a size boundary - adjust address up/down if needed */
#define _ALIGN_UP(addr,size)	(((addr)+((size)-1))&(~((size)-1)))
#define _ALIGN_DOWN(addr,size)	((addr)&(~((size)-1)))

/* align addr on a size boundary - adjust address up if needed */
#define _ALIGN(addr,size)     _ALIGN_UP(addr,size)

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	_ALIGN(addr, PAGE_SIZE)

/*
 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
 * "kernelness", use is_kernel_addr() - it should do what you want.
 */
#define is_kernel_addr(x)	((x) >= PAGE_OFFSET)

#ifndef __ASSEMBLY__

#undef STRICT_MM_TYPECHECKS

#ifdef STRICT_MM_TYPECHECKS
/* These are used to make use of C type-checking. */

/* PTE level */
typedef struct { pte_basic_t pte; } pte_t;
#define pte_val(x)	((x).pte)
#define __pte(x)	((pte_t) { (x) })

/* 64k pages additionally define a bigger "real PTE" type that gathers
 * the "second half" part of the PTE for pseudo 64k pages
 */
#ifdef CONFIG_PPC_64K_PAGES
typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
#else
typedef struct { pte_t pte; } real_pte_t;
#endif

/* PMD level */
#ifdef CONFIG_PPC64
typedef struct { unsigned long pmd; } pmd_t;
#define pmd_val(x)	((x).pmd)
#define __pmd(x)	((pmd_t) { (x) })

/* PUD level exusts only on 4k pages */
#ifndef CONFIG_PPC_64K_PAGES
typedef struct { unsigned long pud; } pud_t;
#define pud_val(x)	((x).pud)
#define __pud(x)	((pud_t) { (x) })
#endif /* !CONFIG_PPC_64K_PAGES */
#endif /* CONFIG_PPC64 */

/* PGD level */
typedef struct { unsigned long pgd; } pgd_t;
#define pgd_val(x)	((x).pgd)
#define __pgd(x)	((pgd_t) { (x) })

/* Page protection bits */
typedef struct { unsigned long pgprot; } pgprot_t;
#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) })

#else

/*
 * .. while these make it easier on the compiler
 */

typedef pte_basic_t pte_t;
#define pte_val(x)	(x)
#define __pte(x)	(x)

#ifdef CONFIG_PPC_64K_PAGES
typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
#else
typedef unsigned long real_pte_t;
#endif


#ifdef CONFIG_PPC64
typedef unsigned long pmd_t;
#define pmd_val(x)	(x)
#define __pmd(x)	(x)

#ifndef CONFIG_PPC_64K_PAGES
typedef unsigned long pud_t;
#define pud_val(x)	(x)
#define __pud(x)	(x)
#endif /* !CONFIG_PPC_64K_PAGES */
#endif /* CONFIG_PPC64 */

typedef unsigned long pgd_t;
#define pgd_val(x)	(x)
#define pgprot_val(x)	(x)

typedef unsigned long pgprot_t;
#define __pgd(x)	(x)
#define __pgprot(x)	(x)

#endif

struct page;
extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
extern void copy_user_page(void *to, void *from, unsigned long vaddr,
		struct page *p);
extern int page_is_ram(unsigned long pfn);

struct vm_area_struct;

#include <asm-generic/memory_model.h>
#endif /* __ASSEMBLY__ */

#endif /* _ASM_POWERPC_PAGE_H */