1 /* 2 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> 3 * Copyright (C) 2004 Microtronix Datacom Ltd. 4 * 5 * MMU support based on asm/page.h from mips which is: 6 * 7 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle 8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file "COPYING" in the main directory of this archive 12 * for more details. 13 */ 14 15 #ifndef _ASM_NIOS2_PAGE_H 16 #define _ASM_NIOS2_PAGE_H 17 18 #include <linux/pfn.h> 19 #include <linux/const.h> 20 21 /* 22 * PAGE_SHIFT determines the page size 23 */ 24 #define PAGE_SHIFT 12 25 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 26 #define PAGE_MASK (~(PAGE_SIZE - 1)) 27 28 /* 29 * PAGE_OFFSET -- the first address of the first page of memory. 30 */ 31 #define PAGE_OFFSET \ 32 (CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE) 33 34 #ifndef __ASSEMBLY__ 35 36 /* 37 * This gives the physical RAM offset. 38 */ 39 #define PHYS_OFFSET CONFIG_NIOS2_MEM_BASE 40 41 /* 42 * It's normally defined only for FLATMEM config but it's 43 * used in our early mem init code for all memory models. 44 * So always define it. 45 */ 46 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 47 48 #define clear_page(page) memset((page), 0, PAGE_SIZE) 49 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 50 51 struct page; 52 53 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page); 54 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 55 struct page *to); 56 57 /* 58 * These are used to make use of C type-checking. 59 */ 60 typedef struct page *pgtable_t; 61 typedef struct { unsigned long pte; } pte_t; 62 typedef struct { unsigned long pgd; } pgd_t; 63 typedef struct { unsigned long pgprot; } pgprot_t; 64 65 #define pte_val(x) ((x).pte) 66 #define pgd_val(x) ((x).pgd) 67 #define pgprot_val(x) ((x).pgprot) 68 69 #define __pte(x) ((pte_t) { (x) }) 70 #define __pgd(x) ((pgd_t) { (x) }) 71 #define __pgprot(x) ((pgprot_t) { (x) }) 72 73 extern unsigned long memory_start; 74 extern unsigned long memory_end; 75 extern unsigned long memory_size; 76 77 extern struct page *mem_map; 78 79 # define __pa(x) \ 80 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 81 # define __va(x) \ 82 ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 83 84 #define page_to_virt(page) \ 85 ((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET) 86 87 # define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 88 89 static inline bool pfn_valid(unsigned long pfn) 90 { 91 /* avoid <linux/mm.h> include hell */ 92 extern unsigned long max_mapnr; 93 unsigned long pfn_offset = ARCH_PFN_OFFSET; 94 95 return pfn >= pfn_offset && pfn < max_mapnr; 96 } 97 98 # define virt_to_page(vaddr) pfn_to_page(PFN_DOWN(virt_to_phys(vaddr))) 99 # define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr))) 100 101 # define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 102 103 #include <asm-generic/memory_model.h> 104 105 #include <asm-generic/getorder.h> 106 107 #endif /* !__ASSEMBLY__ */ 108 109 #endif /* _ASM_NIOS2_PAGE_H */ 110