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#else /* !CONFIG_HUGETLB_PAGE */ 42#define HPAGE_SHIFT ({BUILD_BUG(); 0; }) 43#define HPAGE_SIZE ({BUILD_BUG(); 0; }) 44#define HPAGE_MASK ({BUILD_BUG(); 0; }) 45#define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; }) 46#endif /* CONFIG_HUGETLB_PAGE */ 47 48#ifndef __ASSEMBLY__ 49 50#include <linux/pfn.h> 51#include <asm/io.h> 52 53extern void build_clear_page(void); 54extern void build_copy_page(void); 55 56/* 57 * It's normally defined only for FLATMEM config but it's 58 * used in our early mem init code for all memory models. 59 * So always define it. 60 */ 61#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 62 63extern void clear_page(void * page); 64extern void copy_page(void * to, void * from); 65 66extern unsigned long shm_align_mask; 67 68static inline unsigned long pages_do_alias(unsigned long addr1, 69 unsigned long addr2) 70{ 71 return (addr1 ^ addr2) & shm_align_mask; 72} 73 74struct page; 75 76static inline void clear_user_page(void *addr, unsigned long vaddr, 77 struct page *page) 78{ 79 extern void (*flush_data_cache_page)(unsigned long addr); 80 81 clear_page(addr); 82 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 83 flush_data_cache_page((unsigned long)addr); 84} 85 86extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 87 struct page *to); 88struct vm_area_struct; 89extern void copy_user_highpage(struct page *to, struct page *from, 90 unsigned long vaddr, struct vm_area_struct *vma); 91 92#define __HAVE_ARCH_COPY_USER_HIGHPAGE 93 94/* 95 * These are used to make use of C type-checking.. 96 */ 97#ifdef CONFIG_64BIT_PHYS_ADDR 98 #ifdef CONFIG_CPU_MIPS32 99 typedef struct { unsigned long pte_low, pte_high; } pte_t; 100 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 101 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 102 #else 103 typedef struct { unsigned long long pte; } pte_t; 104 #define pte_val(x) ((x).pte) 105 #define __pte(x) ((pte_t) { (x) } ) 106 #endif 107#else 108typedef struct { unsigned long pte; } pte_t; 109#define pte_val(x) ((x).pte) 110#define __pte(x) ((pte_t) { (x) } ) 111#endif 112typedef struct page *pgtable_t; 113 114/* 115 * Right now we don't support 4-level pagetables, so all pud-related 116 * definitions come from <asm-generic/pgtable-nopud.h>. 117 */ 118 119/* 120 * Finall the top of the hierarchy, the pgd 121 */ 122typedef struct { unsigned long pgd; } pgd_t; 123#define pgd_val(x) ((x).pgd) 124#define __pgd(x) ((pgd_t) { (x) } ) 125 126/* 127 * Manipulate page protection bits 128 */ 129typedef struct { unsigned long pgprot; } pgprot_t; 130#define pgprot_val(x) ((x).pgprot) 131#define __pgprot(x) ((pgprot_t) { (x) } ) 132 133/* 134 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 135 * pair of pages we only have a single global bit per pair of pages. When 136 * writing to the TLB make sure we always have the bit set for both pages 137 * or none. This macro is used to access the `buddy' of the pte we're just 138 * working on. 139 */ 140#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 141 142#endif /* !__ASSEMBLY__ */ 143 144/* 145 * __pa()/__va() should be used only during mem init. 146 */ 147#ifdef CONFIG_64BIT 148#define __pa(x) \ 149({ \ 150 unsigned long __x = (unsigned long)(x); \ 151 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ 152}) 153#else 154#define __pa(x) \ 155 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 156#endif 157#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 158 159/* 160 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad 161 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The 162 * discussion can be found in lkml posting 163 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is 164 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html 165 * 166 * It is unclear if the misscompilations mentioned in 167 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one 168 * until GCC 3.x has been retired before we can apply 169 * https://patchwork.linux-mips.org/patch/1541/ 170 */ 171 172#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 173 174#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 175 176#ifdef CONFIG_FLATMEM 177 178#define pfn_valid(pfn) \ 179({ \ 180 unsigned long __pfn = (pfn); \ 181 /* avoid <linux/bootmem.h> include hell */ \ 182 extern unsigned long min_low_pfn; \ 183 \ 184 __pfn >= min_low_pfn && __pfn < max_mapnr; \ 185}) 186 187#elif defined(CONFIG_SPARSEMEM) 188 189/* pfn_valid is defined in linux/mmzone.h */ 190 191#elif defined(CONFIG_NEED_MULTIPLE_NODES) 192 193#define pfn_valid(pfn) \ 194({ \ 195 unsigned long __pfn = (pfn); \ 196 int __n = pfn_to_nid(__pfn); \ 197 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 198 NODE_DATA(__n)->node_spanned_pages) \ 199 : 0); \ 200}) 201 202#endif 203 204#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 205#define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 206 207#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 208 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 209 210#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE + \ 211 PHYS_OFFSET) 212#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET - \ 213 PHYS_OFFSET) 214 215#include <asm-generic/memory_model.h> 216#include <asm-generic/getorder.h> 217 218#endif /* _ASM_PAGE_H */ 219