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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 <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
40#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
41#define KERNELBASE PAGE_OFFSET
42
43#ifdef CONFIG_DISCONTIGMEM
44#define page_to_pfn(page) discontigmem_page_to_pfn(page)
45#define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn)
46#define pfn_valid(pfn) discontigmem_pfn_valid(pfn)
47#endif
48
49#ifdef CONFIG_FLATMEM
50#define pfn_to_page(pfn) (mem_map + (pfn))
51#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
52#define pfn_valid(pfn) ((pfn) < max_mapnr)
53#endif
54
55#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
56#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
57#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
58
59#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
60#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
61
62/*
63 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI,
64 * and needs to be executable. This means the whole heap ends
65 * up being executable.
66 */
67#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
68 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
69
70#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
71 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
72
73#ifdef __powerpc64__
74#include <asm/page_64.h>
75#else
76#include <asm/page_32.h>
77#endif
78
79/* align addr on a size boundary - adjust address up/down if needed */
80#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
81#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
82
83/* align addr on a size boundary - adjust address up if needed */
84#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
85
86/* to align the pointer to the (next) page boundary */
87#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
88
89#ifndef __ASSEMBLY__
90
91#undef STRICT_MM_TYPECHECKS
92
93#ifdef STRICT_MM_TYPECHECKS
94/* These are used to make use of C type-checking. */
95
96/* PTE level */
97typedef struct { pte_basic_t pte; } pte_t;
98#define pte_val(x) ((x).pte)
99#define __pte(x) ((pte_t) { (x) })
100
101/* 64k pages additionally define a bigger "real PTE" type that gathers
102 * the "second half" part of the PTE for pseudo 64k pages
103 */
104#ifdef CONFIG_PPC_64K_PAGES
105typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
106#else
107typedef struct { pte_t pte; } real_pte_t;
108#endif
109
110/* PMD level */
111typedef struct { unsigned long pmd; } pmd_t;
112#define pmd_val(x) ((x).pmd)
113#define __pmd(x) ((pmd_t) { (x) })
114
115/* PUD level exusts only on 4k pages */
116#ifndef CONFIG_PPC_64K_PAGES
117typedef struct { unsigned long pud; } pud_t;
118#define pud_val(x) ((x).pud)
119#define __pud(x) ((pud_t) { (x) })
120#endif
121
122/* PGD level */
123typedef struct { unsigned long pgd; } pgd_t;
124#define pgd_val(x) ((x).pgd)
125#define __pgd(x) ((pgd_t) { (x) })
126
127/* Page protection bits */
128typedef struct { unsigned long pgprot; } pgprot_t;
129#define pgprot_val(x) ((x).pgprot)
130#define __pgprot(x) ((pgprot_t) { (x) })
131
132#else
133
134/*
135 * .. while these make it easier on the compiler
136 */
137
138typedef pte_basic_t pte_t;
139#define pte_val(x) (x)
140#define __pte(x) (x)
141
142#ifdef CONFIG_PPC_64K_PAGES
143typedef struct { pte_t pte; unsigned long hidx; } real_pte_t;
144#else
145typedef unsigned long real_pte_t;
146#endif
147
148
149typedef unsigned long pmd_t;
150#define pmd_val(x) (x)
151#define __pmd(x) (x)
152
153#ifndef CONFIG_PPC_64K_PAGES
154typedef unsigned long pud_t;
155#define pud_val(x) (x)
156#define __pud(x) (x)
157#endif
158
159typedef unsigned long pgd_t;
160#define pgd_val(x) (x)
161#define pgprot_val(x) (x)
162
163typedef unsigned long pgprot_t;
164#define __pgd(x) (x)
165#define __pgprot(x) (x)
166
167#endif
168
169struct page;
170extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
171extern void copy_user_page(void *to, void *from, unsigned long vaddr,
172 struct page *p);
173extern int page_is_ram(unsigned long pfn);
174
175#endif /* __ASSEMBLY__ */
176
177#endif /* __KERNEL__ */
178
179#endif /* _ASM_POWERPC_PAGE_H */