1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 */ 9#ifndef _ASM_PAGE_H 10#define _ASM_PAGE_H 11 12#include <spaces.h> 13#include <linux/const.h> 14 15/* 16 * PAGE_SHIFT determines the page size 17 */ 18#ifdef CONFIG_PAGE_SIZE_4KB 19#define PAGE_SHIFT 12 20#endif 21#ifdef CONFIG_PAGE_SIZE_8KB 22#define PAGE_SHIFT 13 23#endif 24#ifdef CONFIG_PAGE_SIZE_16KB 25#define PAGE_SHIFT 14 26#endif 27#ifdef CONFIG_PAGE_SIZE_32KB 28#define PAGE_SHIFT 15 29#endif 30#ifdef CONFIG_PAGE_SIZE_64KB 31#define PAGE_SHIFT 16 32#endif 33#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) 34#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 35 36#ifdef CONFIG_HUGETLB_PAGE 37#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) 38#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT) 39#define HPAGE_MASK (~(HPAGE_SIZE - 1)) 40#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 41#endif /* CONFIG_HUGETLB_PAGE */ 42 43#ifndef __ASSEMBLY__ 44 45#include <linux/pfn.h> 46#include <asm/io.h> 47 48extern void build_clear_page(void); 49extern void build_copy_page(void); 50 51/* 52 * It's normally defined only for FLATMEM config but it's 53 * used in our early mem init code for all memory models. 54 * So always define it. 55 */ 56#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 57 58extern void clear_page(void * page); 59extern void copy_page(void * to, void * from); 60 61extern unsigned long shm_align_mask; 62 63static inline unsigned long pages_do_alias(unsigned long addr1, 64 unsigned long addr2) 65{ 66 return (addr1 ^ addr2) & shm_align_mask; 67} 68 69struct page; 70 71static inline void clear_user_page(void *addr, unsigned long vaddr, 72 struct page *page) 73{ 74 extern void (*flush_data_cache_page)(unsigned long addr); 75 76 clear_page(addr); 77 if (cpu_has_vtag_dcache || (cpu_has_dc_aliases && 78 pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))) 79 flush_data_cache_page((unsigned long)addr); 80} 81 82extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 83 struct page *to); 84struct vm_area_struct; 85extern void copy_user_highpage(struct page *to, struct page *from, 86 unsigned long vaddr, struct vm_area_struct *vma); 87 88#define __HAVE_ARCH_COPY_USER_HIGHPAGE 89 90/* 91 * These are used to make use of C type-checking.. 92 */ 93#ifdef CONFIG_64BIT_PHYS_ADDR 94 #ifdef CONFIG_CPU_MIPS32 95 typedef struct { unsigned long pte_low, pte_high; } pte_t; 96 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 97 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 98 #else 99 typedef struct { unsigned long long pte; } pte_t; 100 #define pte_val(x) ((x).pte) 101 #define __pte(x) ((pte_t) { (x) } ) 102 #endif 103#else 104typedef struct { unsigned long pte; } pte_t; 105#define pte_val(x) ((x).pte) 106#define __pte(x) ((pte_t) { (x) } ) 107#endif 108typedef struct page *pgtable_t; 109 110/* 111 * Right now we don't support 4-level pagetables, so all pud-related 112 * definitions come from <asm-generic/pgtable-nopud.h>. 113 */ 114 115/* 116 * Finall the top of the hierarchy, the pgd 117 */ 118typedef struct { unsigned long pgd; } pgd_t; 119#define pgd_val(x) ((x).pgd) 120#define __pgd(x) ((pgd_t) { (x) } ) 121 122/* 123 * Manipulate page protection bits 124 */ 125typedef struct { unsigned long pgprot; } pgprot_t; 126#define pgprot_val(x) ((x).pgprot) 127#define __pgprot(x) ((pgprot_t) { (x) } ) 128 129/* 130 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 131 * pair of pages we only have a single global bit per pair of pages. When 132 * writing to the TLB make sure we always have the bit set for both pages 133 * or none. This macro is used to access the `buddy' of the pte we're just 134 * working on. 135 */ 136#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 137 138#endif /* !__ASSEMBLY__ */ 139 140/* 141 * __pa()/__va() should be used only during mem init. 142 */ 143#ifdef CONFIG_64BIT 144#define __pa(x) \ 145({ \ 146 unsigned long __x = (unsigned long)(x); \ 147 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ 148}) 149#else 150#define __pa(x) \ 151 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 152#endif 153#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 154 155/* 156 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad 157 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The 158 * discussion can be found in lkml posting 159 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is 160 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html 161 * 162 * It is unclear if the misscompilations mentioned in 163 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one 164 * until GCC 3.x has been retired before we can apply 165 * https://patchwork.linux-mips.org/patch/1541/ 166 */ 167 168#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 169 170#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 171 172#ifdef CONFIG_FLATMEM 173 174#define pfn_valid(pfn) \ 175({ \ 176 unsigned long __pfn = (pfn); \ 177 /* avoid <linux/bootmem.h> include hell */ \ 178 extern unsigned long min_low_pfn; \ 179 \ 180 __pfn >= min_low_pfn && __pfn < max_mapnr; \ 181}) 182 183#elif defined(CONFIG_SPARSEMEM) 184 185/* pfn_valid is defined in linux/mmzone.h */ 186 187#elif defined(CONFIG_NEED_MULTIPLE_NODES) 188 189#define pfn_valid(pfn) \ 190({ \ 191 unsigned long __pfn = (pfn); \ 192 int __n = pfn_to_nid(__pfn); \ 193 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 194 NODE_DATA(__n)->node_spanned_pages) \ 195 : 0); \ 196}) 197 198#endif 199 200#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 201#define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 202 203#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 204 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 205 206#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE + \ 207 PHYS_OFFSET) 208#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET - \ 209 PHYS_OFFSET) 210 211#include <asm-generic/memory_model.h> 212#include <asm-generic/getorder.h> 213 214#endif /* _ASM_PAGE_H */ 215