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#ifndef __ASSEMBLY__ 14#include <linux/types.h> 15#else 16#include <asm/types.h> 17#endif 18#include <asm/asm-compat.h> 19#include <asm/kdump.h> 20 21/* 22 * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software 23 * page size. When using 64K pages however, whether we are really supporting 24 * 64K pages in HW or not is irrelevant to those definitions. 25 */ 26#ifdef CONFIG_PPC_64K_PAGES 27#define PAGE_SHIFT 16 28#else 29#define PAGE_SHIFT 12 30#endif 31 32#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) 33 34/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ 35#define __HAVE_ARCH_GATE_AREA 1 36 37/* 38 * Subtle: (1 << PAGE_SHIFT) is an int, not an unsigned long. So if we 39 * assign PAGE_MASK to a larger type it gets extended the way we want 40 * (i.e. with 1s in the high bits) 41 */ 42#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 43 44/* 45 * KERNELBASE is the virtual address of the start of the kernel, it's often 46 * the same as PAGE_OFFSET, but _might not be_. 47 * 48 * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. 49 * 50 * PAGE_OFFSET is the virtual address of the start of lowmem. 51 * 52 * PHYSICAL_START is the physical address of the start of the kernel. 53 * 54 * MEMORY_START is the physical address of the start of lowmem. 55 * 56 * KERNELBASE, PAGE_OFFSET, and PHYSICAL_START are all configurable on 57 * ppc32 and based on how they are set we determine MEMORY_START. 58 * 59 * For the linear mapping the following equation should be true: 60 * KERNELBASE - PAGE_OFFSET = PHYSICAL_START - MEMORY_START 61 * 62 * Also, KERNELBASE >= PAGE_OFFSET and PHYSICAL_START >= MEMORY_START 63 * 64 * There are two was to determine a physical address from a virtual one: 65 * va = pa + PAGE_OFFSET - MEMORY_START 66 * va = pa + KERNELBASE - PHYSICAL_START 67 * 68 * If you want to know something's offset from the start of the kernel you 69 * should subtract KERNELBASE. 70 * 71 * If you want to test if something's a kernel address, use is_kernel_addr(). 72 */ 73 74#define KERNELBASE ASM_CONST(CONFIG_KERNEL_START) 75#define PAGE_OFFSET ASM_CONST(CONFIG_PAGE_OFFSET) 76#define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START)) 77 78#if defined(CONFIG_RELOCATABLE) 79#ifndef __ASSEMBLY__ 80 81extern phys_addr_t memstart_addr; 82extern phys_addr_t kernstart_addr; 83#endif 84#define PHYSICAL_START kernstart_addr 85#else 86#define PHYSICAL_START ASM_CONST(CONFIG_PHYSICAL_START) 87#endif 88 89#ifdef CONFIG_PPC64 90#define MEMORY_START 0UL 91#elif defined(CONFIG_RELOCATABLE) 92#define MEMORY_START memstart_addr 93#else 94#define MEMORY_START (PHYSICAL_START + PAGE_OFFSET - KERNELBASE) 95#endif 96 97#ifdef CONFIG_FLATMEM 98#define ARCH_PFN_OFFSET (MEMORY_START >> PAGE_SHIFT) 99#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (ARCH_PFN_OFFSET + max_mapnr)) 100#endif 101 102#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 103#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 104#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 105 106#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - MEMORY_START)) 107#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + MEMORY_START) 108 109/* 110 * Unfortunately the PLT is in the BSS in the PPC32 ELF ABI, 111 * and needs to be executable. This means the whole heap ends 112 * up being executable. 113 */ 114#define VM_DATA_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ 115 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 116 117#define VM_DATA_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ 118 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 119 120#ifdef __powerpc64__ 121#include <asm/page_64.h> 122#else 123#include <asm/page_32.h> 124#endif 125 126/* align addr on a size boundary - adjust address up/down if needed */ 127#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1))) 128#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1))) 129 130/* align addr on a size boundary - adjust address up if needed */ 131#define _ALIGN(addr,size) _ALIGN_UP(addr,size) 132 133/* 134 * Don't compare things with KERNELBASE or PAGE_OFFSET to test for 135 * "kernelness", use is_kernel_addr() - it should do what you want. 136 */ 137#define is_kernel_addr(x) ((x) >= PAGE_OFFSET) 138 139#ifndef __ASSEMBLY__ 140 141#undef STRICT_MM_TYPECHECKS 142 143#ifdef STRICT_MM_TYPECHECKS 144/* These are used to make use of C type-checking. */ 145 146/* PTE level */ 147typedef struct { pte_basic_t pte; } pte_t; 148#define pte_val(x) ((x).pte) 149#define __pte(x) ((pte_t) { (x) }) 150 151/* 64k pages additionally define a bigger "real PTE" type that gathers 152 * the "second half" part of the PTE for pseudo 64k pages 153 */ 154#ifdef CONFIG_PPC_64K_PAGES 155typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; 156#else 157typedef struct { pte_t pte; } real_pte_t; 158#endif 159 160/* PMD level */ 161#ifdef CONFIG_PPC64 162typedef struct { unsigned long pmd; } pmd_t; 163#define pmd_val(x) ((x).pmd) 164#define __pmd(x) ((pmd_t) { (x) }) 165 166/* PUD level exusts only on 4k pages */ 167#ifndef CONFIG_PPC_64K_PAGES 168typedef struct { unsigned long pud; } pud_t; 169#define pud_val(x) ((x).pud) 170#define __pud(x) ((pud_t) { (x) }) 171#endif /* !CONFIG_PPC_64K_PAGES */ 172#endif /* CONFIG_PPC64 */ 173 174/* PGD level */ 175typedef struct { unsigned long pgd; } pgd_t; 176#define pgd_val(x) ((x).pgd) 177#define __pgd(x) ((pgd_t) { (x) }) 178 179/* Page protection bits */ 180typedef struct { unsigned long pgprot; } pgprot_t; 181#define pgprot_val(x) ((x).pgprot) 182#define __pgprot(x) ((pgprot_t) { (x) }) 183 184#else 185 186/* 187 * .. while these make it easier on the compiler 188 */ 189 190typedef pte_basic_t pte_t; 191#define pte_val(x) (x) 192#define __pte(x) (x) 193 194#ifdef CONFIG_PPC_64K_PAGES 195typedef struct { pte_t pte; unsigned long hidx; } real_pte_t; 196#else 197typedef unsigned long real_pte_t; 198#endif 199 200 201#ifdef CONFIG_PPC64 202typedef unsigned long pmd_t; 203#define pmd_val(x) (x) 204#define __pmd(x) (x) 205 206#ifndef CONFIG_PPC_64K_PAGES 207typedef unsigned long pud_t; 208#define pud_val(x) (x) 209#define __pud(x) (x) 210#endif /* !CONFIG_PPC_64K_PAGES */ 211#endif /* CONFIG_PPC64 */ 212 213typedef unsigned long pgd_t; 214#define pgd_val(x) (x) 215#define pgprot_val(x) (x) 216 217typedef unsigned long pgprot_t; 218#define __pgd(x) (x) 219#define __pgprot(x) (x) 220 221#endif 222 223struct page; 224extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); 225extern void copy_user_page(void *to, void *from, unsigned long vaddr, 226 struct page *p); 227extern int page_is_ram(unsigned long pfn); 228 229struct vm_area_struct; 230 231typedef struct page *pgtable_t; 232 233#include <asm-generic/memory_model.h> 234#endif /* __ASSEMBLY__ */ 235 236#endif /* _ASM_POWERPC_PAGE_H */ 237