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-rw-r--r--include/asm-powerpc/page.h225
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diff --git a/include/asm-powerpc/page.h b/include/asm-powerpc/page.h
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--- a/include/asm-powerpc/page.h
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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#include <asm/asm-compat.h>
14#include <asm/kdump.h>
15#include <asm/types.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 * PAGE_OFFSET is the virtual address of the start of lowmem.
47 *
48 * PHYSICAL_START is the physical address of the start of the kernel.
49 *
50 * MEMORY_START is the physical address of the start of lowmem.
51 *
52 * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on
53 * ppc32 and based on how they are set we determine MEMORY_START.
54 *
55 * For the linear mapping the following equation should be true:
56 * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START
57 *
58 * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START
59 *
60 * There are two was to determine a physical address from a virtual one:
61 * va = pa + PAGE_OFFSET - MEMORY_START
62 * va = pa + KERNELBASE - PHYSICAL_START
63 *
64 * If you want to know something's offset from the start of the kernel you
65 * should subtract KERNELBASE.
66 *
67 * If you want to test if something's a kernel address, use is_kernel_addr().
68 */
69
70#define KERNELBASE ASM_CONST(CONFIG_KERNEL_START)
71#define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET)
72#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))
73
74#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_FLATMEM)
75#ifndef __ASSEMBLY__
76extern phys_addr_t memstart_addr;
77extern phys_addr_t kernstart_addr;
78#endif
79#define PHYSICAL_START kernstart_addr
80#define MEMORY_START memstart_addr
81#else
82#define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START)
83#define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE)
84#endif
85
86#ifdef CONFIG_FLATMEM
87#define ARCH_PFN_OFFSET (MEMORY_START >> PAGE_SHIFT)
88#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr))
89#endif
90
91#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
92#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
93#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
94
95#define __va(x) ((void *)((unsigned long)(x) - PHYSICAL_START + KERNELBASE))
96#define __pa(x) ((unsigned long)(x) + PHYSICAL_START - KERNELBASE)
97
98/*
99 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
100 * and needs to be executable. This means the whole heap ends
101 * up being executable.
102 */
103#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
104 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
105
106#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
107 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
108
109#ifdef __powerpc64__
110#include <asm/page_64.h>
111#else
112#include <asm/page_32.h>
113#endif
114
115/* align addr on a size boundary - adjust address up/down if needed */
116#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
117#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
118
119/* align addr on a size boundary - adjust address up if needed */
120#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
121
122/*
123 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for
124 * "kernelness", use is_kernel_addr() - it should do what you want.
125 */
126#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
127
128#ifndef __ASSEMBLY__
129
130#undef STRICT_MM_TYPECHECKS
131
132#ifdef STRICT_MM_TYPECHECKS
133/* These are used to make use of C type-checking. */
134
135/* PTE level */
136typedef struct { pte_basic_t pte; } pte_t;
137#define pte_val(x) ((x).pte)
138#define __pte(x) ((pte_t) { (x) })
139
140/* 64k pages additionally define a bigger "real PTE" type that gathers
141 * the "second half" part of the PTE for pseudo 64k pages
142 */
143#ifdef CONFIG_PPC_64K_PAGES
144typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
145#else
146typedef struct { pte_t pte; } real_pte_t;
147#endif
148
149/* PMD level */
150#ifdef CONFIG_PPC64
151typedef struct { unsigned long pmd; } pmd_t;
152#define pmd_val(x) ((x).pmd)
153#define __pmd(x) ((pmd_t) { (x) })
154
155/* PUD level exusts only on 4k pages */
156#ifndef CONFIG_PPC_64K_PAGES
157typedef struct { unsigned long pud; } pud_t;
158#define pud_val(x) ((x).pud)
159#define __pud(x) ((pud_t) { (x) })
160#endif /* !CONFIG_PPC_64K_PAGES */
161#endif /* CONFIG_PPC64 */
162
163/* PGD level */
164typedef struct { unsigned long pgd; } pgd_t;
165#define pgd_val(x) ((x).pgd)
166#define __pgd(x) ((pgd_t) { (x) })
167
168/* Page protection bits */
169typedef struct { unsigned long pgprot; } pgprot_t;
170#define pgprot_val(x) ((x).pgprot)
171#define __pgprot(x) ((pgprot_t) { (x) })
172
173#else
174
175/*
176 * .. while these make it easier on the compiler
177 */
178
179typedef pte_basic_t pte_t;
180#define pte_val(x) (x)
181#define __pte(x) (x)
182
183#ifdef CONFIG_PPC_64K_PAGES
184typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
185#else
186typedef unsigned long real_pte_t;
187#endif
188
189
190#ifdef CONFIG_PPC64
191typedef unsigned long pmd_t;
192#define pmd_val(x) (x)
193#define __pmd(x) (x)
194
195#ifndef CONFIG_PPC_64K_PAGES
196typedef unsigned long pud_t;
197#define pud_val(x) (x)
198#define __pud(x) (x)
199#endif /* !CONFIG_PPC_64K_PAGES */
200#endif /* CONFIG_PPC64 */
201
202typedef unsigned long pgd_t;
203#define pgd_val(x) (x)
204#define pgprot_val(x) (x)
205
206typedef unsigned long pgprot_t;
207#define __pgd(x) (x)
208#define __pgprot(x) (x)
209
210#endif
211
212struct page;
213extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
214extern void copy_user_page(void *to, void *from, unsigned long vaddr,
215 struct page *p);
216extern int page_is_ram(unsigned long pfn);
217
218struct vm_area_struct;
219
220typedef struct page *pgtable_t;
221
222#include <asm-generic/memory_model.h>
223#endif /* __ASSEMBLY__ */
224
225#endif /* _ASM_POWERPC_PAGE_H */
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