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Michael Ellerman5cd16ee2005-11-11 14:25:24 +11001#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 <linux/config.h>
15#include <asm/asm-compat.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
Michael Ellermanb5666f72005-12-05 10:24:33 -060040/*
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 */
Michael Ellerman398ab1f2005-12-04 18:39:23 +110054
55#ifdef CONFIG_CRASH_DUMP
56/* Kdump kernel runs at 32 MB, change at your peril. */
57#define PHYSICAL_START 0x2000000
58#else
59#define PHYSICAL_START 0x0
60#endif
61
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110062#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
Michael Ellerman398ab1f2005-12-04 18:39:23 +110063#define KERNELBASE (PAGE_OFFSET + PHYSICAL_START)
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110064
65#ifdef CONFIG_DISCONTIGMEM
66#define page_to_pfn(page) discontigmem_page_to_pfn(page)
67#define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn)
68#define pfn_valid(pfn) discontigmem_pfn_valid(pfn)
69#endif
70
71#ifdef CONFIG_FLATMEM
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110072#define pfn_valid(pfn) ((pfn) < max_mapnr)
73#endif
74
75#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
76#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
77#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
78
Michael Ellermanb5666f72005-12-05 10:24:33 -060079#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
Michael Ellerman5cd16ee2005-11-11 14:25:24 +110080#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
81
82/*
83 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
84 * and needs to be executable. This means the whole heap ends
85 * up being executable.
86 */
87#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
88 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
89
90#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
91 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
92
93#ifdef __powerpc64__
94#include <asm/page_64.h>
95#else
96#include <asm/page_32.h>
97#endif
98
99/* align addr on a size boundary - adjust address up/down if needed */
100#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
101#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
102
103/* align addr on a size boundary - adjust address up if needed */
104#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
105
106/* to align the pointer to the (next) page boundary */
107#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
108
Michael Ellerman51fae6de2005-12-04 18:39:15 +1100109/*
110 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
111 * "kernelness", use is_kernel_addr() - it should do what you want.
112 */
113#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
114
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100115#ifndef __ASSEMBLY__
116
117#undef STRICT_MM_TYPECHECKS
118
119#ifdef STRICT_MM_TYPECHECKS
120/* These are used to make use of C type-checking. */
121
122/* PTE level */
123typedef struct { pte_basic_t pte; } pte_t;
124#define pte_val(x) ((x).pte)
125#define __pte(x) ((pte_t) { (x) })
126
127/* 64k pages additionally define a bigger "real PTE" type that gathers
128 * the "second half" part of the PTE for pseudo 64k pages
129 */
130#ifdef CONFIG_PPC_64K_PAGES
131typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
132#else
133typedef struct { pte_t pte; } real_pte_t;
134#endif
135
136/* PMD level */
137typedef struct { unsigned long pmd; } pmd_t;
138#define pmd_val(x) ((x).pmd)
139#define __pmd(x) ((pmd_t) { (x) })
140
141/* PUD level exusts only on 4k pages */
142#ifndef CONFIG_PPC_64K_PAGES
143typedef struct { unsigned long pud; } pud_t;
144#define pud_val(x) ((x).pud)
145#define __pud(x) ((pud_t) { (x) })
146#endif
147
148/* PGD level */
149typedef struct { unsigned long pgd; } pgd_t;
150#define pgd_val(x) ((x).pgd)
151#define __pgd(x) ((pgd_t) { (x) })
152
153/* Page protection bits */
154typedef struct { unsigned long pgprot; } pgprot_t;
155#define pgprot_val(x) ((x).pgprot)
156#define __pgprot(x) ((pgprot_t) { (x) })
157
158#else
159
160/*
161 * .. while these make it easier on the compiler
162 */
163
164typedef pte_basic_t pte_t;
165#define pte_val(x) (x)
166#define __pte(x) (x)
167
168#ifdef CONFIG_PPC_64K_PAGES
169typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
170#else
171typedef unsigned long real_pte_t;
172#endif
173
174
175typedef unsigned long pmd_t;
176#define pmd_val(x) (x)
177#define __pmd(x) (x)
178
Paul Mackerrasc38a04b2006-01-11 16:27:21 +1100179#if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_64K_PAGES)
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100180typedef unsigned long pud_t;
181#define pud_val(x) (x)
182#define __pud(x) (x)
183#endif
184
185typedef unsigned long pgd_t;
186#define pgd_val(x) (x)
187#define pgprot_val(x) (x)
188
189typedef unsigned long pgprot_t;
190#define __pgd(x) (x)
191#define __pgprot(x) (x)
192
193#endif
194
195struct page;
196extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
197extern void copy_user_page(void *to, void *from, unsigned long vaddr,
198 struct page *p);
199extern int page_is_ram(unsigned long pfn);
200
KAMEZAWA Hiroyuki659e3502006-03-27 01:15:35 -0800201#include <asm-generic/memory_model.h>
Michael Ellerman5cd16ee2005-11-11 14:25:24 +1100202#endif /* __ASSEMBLY__ */
203
204#endif /* __KERNEL__ */
205
206#endif /* _ASM_POWERPC_PAGE_H */