Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 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 | |
Michael Ellerman | b5666f7 | 2005-12-05 10:24:33 -0600 | [diff] [blame] | 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 | */ |
Michael Ellerman | 398ab1f | 2005-12-04 18:39:23 +1100 | [diff] [blame] | 54 | |
| 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 Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 62 | #define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START) |
Michael Ellerman | 398ab1f | 2005-12-04 18:39:23 +1100 | [diff] [blame] | 63 | #define KERNELBASE (PAGE_OFFSET + PHYSICAL_START) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 64 | |
| 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 Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 72 | #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 Ellerman | b5666f7 | 2005-12-05 10:24:33 -0600 | [diff] [blame] | 79 | #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET)) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 80 | #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 Ellerman | 51fae6de | 2005-12-04 18:39:15 +1100 | [diff] [blame] | 109 | /* |
| 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 Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 115 | #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 */ |
| 123 | typedef 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 |
| 131 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; |
| 132 | #else |
| 133 | typedef struct { pte_t pte; } real_pte_t; |
| 134 | #endif |
| 135 | |
| 136 | /* PMD level */ |
| 137 | typedef 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 |
| 143 | typedef 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 */ |
| 149 | typedef 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 */ |
| 154 | typedef 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 | |
| 164 | typedef pte_basic_t pte_t; |
| 165 | #define pte_val(x) (x) |
| 166 | #define __pte(x) (x) |
| 167 | |
| 168 | #ifdef CONFIG_PPC_64K_PAGES |
| 169 | typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; |
| 170 | #else |
| 171 | typedef unsigned long real_pte_t; |
| 172 | #endif |
| 173 | |
| 174 | |
| 175 | typedef unsigned long pmd_t; |
| 176 | #define pmd_val(x) (x) |
| 177 | #define __pmd(x) (x) |
| 178 | |
Paul Mackerras | c38a04b | 2006-01-11 16:27:21 +1100 | [diff] [blame] | 179 | #if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_64K_PAGES) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 180 | typedef unsigned long pud_t; |
| 181 | #define pud_val(x) (x) |
| 182 | #define __pud(x) (x) |
| 183 | #endif |
| 184 | |
| 185 | typedef unsigned long pgd_t; |
| 186 | #define pgd_val(x) (x) |
| 187 | #define pgprot_val(x) (x) |
| 188 | |
| 189 | typedef unsigned long pgprot_t; |
| 190 | #define __pgd(x) (x) |
| 191 | #define __pgprot(x) (x) |
| 192 | |
| 193 | #endif |
| 194 | |
| 195 | struct page; |
| 196 | extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); |
| 197 | extern void copy_user_page(void *to, void *from, unsigned long vaddr, |
| 198 | struct page *p); |
| 199 | extern int page_is_ram(unsigned long pfn); |
| 200 | |
KAMEZAWA Hiroyuki | 659e350 | 2006-03-27 01:15:35 -0800 | [diff] [blame] | 201 | #include <asm-generic/memory_model.h> |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 202 | #endif /* __ASSEMBLY__ */ |
| 203 | |
| 204 | #endif /* __KERNEL__ */ |
| 205 | |
| 206 | #endif /* _ASM_POWERPC_PAGE_H */ |