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 */ 124#ifdef CONFIG_PPC64 125typedef struct { unsigned long pmd; } pmd_t; 126#define pmd_val(x) ((x).pmd) 127#define __pmd(x) ((pmd_t) { (x) }) 128 129/* PUD level exusts only on 4k pages */ 130#ifndef CONFIG_PPC_64K_PAGES 131typedef struct { unsigned long pud; } pud_t; 132#define pud_val(x) ((x).pud) 133#define __pud(x) ((pud_t) { (x) }) 134#endif /* !CONFIG_PPC_64K_PAGES */ 135#endif /* CONFIG_PPC64 */ 136 137/* PGD level */ 138typedef struct { unsigned long pgd; } pgd_t; 139#define pgd_val(x) ((x).pgd) 140#define __pgd(x) ((pgd_t) { (x) }) 141 142/* Page protection bits */ 143typedef struct { unsigned long pgprot; } pgprot_t; 144#define pgprot_val(x) ((x).pgprot) 145#define __pgprot(x) ((pgprot_t) { (x) }) 146 147#else 148 149/* 150 * .. while these make it easier on the compiler 151 */ 152 153typedef pte_basic_t pte_t; 154#define pte_val(x) (x) 155#define __pte(x) (x) 156 157#ifdef CONFIG_PPC_64K_PAGES 158typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; 159#else 160typedef unsigned long real_pte_t; 161#endif 162 163 164#ifdef CONFIG_PPC64 165typedef unsigned long pmd_t; 166#define pmd_val(x) (x) 167#define __pmd(x) (x) 168 169#ifndef CONFIG_PPC_64K_PAGES 170typedef unsigned long pud_t; 171#define pud_val(x) (x) 172#define __pud(x) (x) 173#endif /* !CONFIG_PPC_64K_PAGES */ 174#endif /* CONFIG_PPC64 */ 175 176typedef unsigned long pgd_t; 177#define pgd_val(x) (x) 178#define pgprot_val(x) (x) 179 180typedef unsigned long pgprot_t; 181#define __pgd(x) (x) 182#define __pgprot(x) (x) 183 184#endif 185 186struct page; 187extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); 188extern void copy_user_page(void *to, void *from, unsigned long vaddr, 189 struct page *p); 190extern int page_is_ram(unsigned long pfn); 191 192struct vm_area_struct; 193extern const char *arch_vma_name(struct vm_area_struct *vma); 194 195#include <asm-generic/memory_model.h> 196#endif /* __ASSEMBLY__ */ 197 198#endif /* __KERNEL__ */ 199 200#endif /* _ASM_POWERPC_PAGE_H */ 201