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Linux kernel mirror (for testing)
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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#ifdef __KERNEL__
14#include <asm/asm-compat.h>
15#include <asm/kdump.h>
16
17/*
18 * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software
19 * page size. When using 64K pages however, whether we are really supporting
20 * 64K pages in HW or not is irrelevant to those definitions.
21 */
22#ifdef CONFIG_PPC_64K_PAGES
23#define PAGE_SHIFT 16
24#else
25#define PAGE_SHIFT 12
26#endif
27
28#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
29
30/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
31#define __HAVE_ARCH_GATE_AREA 1
32
33/*
34 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we
35 * assign PAGE_MASK to a larger type it gets extended the way we want
36 * (i.e. with 1s in the high bits)
37 */
38#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
39
40/*
41 * KERNELBASE is the virtual address of the start of the kernel, it's often
42 * the same as PAGE_OFFSET, but _might not be_.
43 *
44 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
45 *
46 * To get a physical address from a virtual one you subtract PAGE_OFFSET,
47 * _not_ KERNELBASE.
48 *
49 * If you want to know something's offset from the start of the kernel you
50 * should subtract KERNELBASE.
51 *
52 * If you want to test if something's a kernel address, use is_kernel_addr().
53 */
54
55#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
56#define KERNELBASE (PAGE_OFFSET + PHYSICAL_START)
57
58#ifdef CONFIG_FLATMEM
59#define pfn_valid(pfn) ((pfn) < max_mapnr)
60#endif
61
62#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
63#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
64#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
65
66#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
67#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
68
69/*
70 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
71 * and needs to be executable. This means the whole heap ends
72 * up being executable.
73 */
74#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
75 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
76
77#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
78 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
79
80#ifdef __powerpc64__
81#include <asm/page_64.h>
82#else
83#include <asm/page_32.h>
84#endif
85
86/* align addr on a size boundary - adjust address up/down if needed */
87#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
88#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
89
90/* align addr on a size boundary - adjust address up if needed */
91#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
92
93/* to align the pointer to the (next) page boundary */
94#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
95
96/*
97 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
98 * "kernelness", use is_kernel_addr() - it should do what you want.
99 */
100#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
101
102#ifndef __ASSEMBLY__
103
104#undef STRICT_MM_TYPECHECKS
105
106#ifdef STRICT_MM_TYPECHECKS
107/* These are used to make use of C type-checking. */
108
109/* PTE level */
110typedef struct { pte_basic_t pte; } pte_t;
111#define pte_val(x) ((x).pte)
112#define __pte(x) ((pte_t) { (x) })
113
114/* 64k pages additionally define a bigger "real PTE" type that gathers
115 * the "second half" part of the PTE for pseudo 64k pages
116 */
117#ifdef CONFIG_PPC_64K_PAGES
118typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
119#else
120typedef struct { pte_t pte; } real_pte_t;
121#endif
122
123/* PMD level */
124typedef struct { unsigned long pmd; } pmd_t;
125#define pmd_val(x) ((x).pmd)
126#define __pmd(x) ((pmd_t) { (x) })
127
128/* PUD level exusts only on 4k pages */
129#ifndef CONFIG_PPC_64K_PAGES
130typedef struct { unsigned long pud; } pud_t;
131#define pud_val(x) ((x).pud)
132#define __pud(x) ((pud_t) { (x) })
133#endif
134
135/* PGD level */
136typedef struct { unsigned long pgd; } pgd_t;
137#define pgd_val(x) ((x).pgd)
138#define __pgd(x) ((pgd_t) { (x) })
139
140/* Page protection bits */
141typedef struct { unsigned long pgprot; } pgprot_t;
142#define pgprot_val(x) ((x).pgprot)
143#define __pgprot(x) ((pgprot_t) { (x) })
144
145#else
146
147/*
148 * .. while these make it easier on the compiler
149 */
150
151typedef pte_basic_t pte_t;
152#define pte_val(x) (x)
153#define __pte(x) (x)
154
155#ifdef CONFIG_PPC_64K_PAGES
156typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
157#else
158typedef unsigned long real_pte_t;
159#endif
160
161
162typedef unsigned long pmd_t;
163#define pmd_val(x) (x)
164#define __pmd(x) (x)
165
166#if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_64K_PAGES)
167typedef unsigned long pud_t;
168#define pud_val(x) (x)
169#define __pud(x) (x)
170#endif
171
172typedef unsigned long pgd_t;
173#define pgd_val(x) (x)
174#define pgprot_val(x) (x)
175
176typedef unsigned long pgprot_t;
177#define __pgd(x) (x)
178#define __pgprot(x) (x)
179
180#endif
181
182struct page;
183extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
184extern void copy_user_page(void *to, void *from, unsigned long vaddr,
185 struct page *p);
186extern int page_is_ram(unsigned long pfn);
187
188struct vm_area_struct;
189extern const char *arch_vma_name(struct vm_area_struct *vma);
190
191#include <asm-generic/memory_model.h>
192#endif /* __ASSEMBLY__ */
193
194#endif /* __KERNEL__ */
195
196#endif /* _ASM_POWERPC_PAGE_H */