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 #include <vdso/page.h> 22 23 /* 24 * PAGE_OFFSET -- the first address of the first page of memory. 25 */ 26 #define PAGE_OFFSET \ 27 (CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE) 28 29 #ifndef __ASSEMBLY__ 30 31 /* 32 * This gives the physical RAM offset. 33 */ 34 #define PHYS_OFFSET CONFIG_NIOS2_MEM_BASE 35 36 /* 37 * It's normally defined only for FLATMEM config but it's 38 * used in our early mem init code for all memory models. 39 * So always define it. 40 */ 41 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 42 43 #define clear_page(page) memset((page), 0, PAGE_SIZE) 44 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 45 46 struct page; 47 48 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page); 49 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 50 struct page *to); 51 52 /* 53 * These are used to make use of C type-checking. 54 */ 55 typedef struct page *pgtable_t; 56 typedef struct { unsigned long pte; } pte_t; 57 typedef struct { unsigned long pgd; } pgd_t; 58 typedef struct { unsigned long pgprot; } pgprot_t; 59 60 #define pte_val(x) ((x).pte) 61 #define pgd_val(x) ((x).pgd) 62 #define pgprot_val(x) ((x).pgprot) 63 64 #define __pte(x) ((pte_t) { (x) }) 65 #define __pgd(x) ((pgd_t) { (x) }) 66 #define __pgprot(x) ((pgprot_t) { (x) }) 67 68 extern unsigned long memory_start; 69 extern unsigned long memory_end; 70 extern unsigned long memory_size; 71 72 extern struct page *mem_map; 73 74 # define __pa(x) \ 75 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 76 # define __va(x) \ 77 ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 78 79 #define page_to_virt(page) \ 80 ((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET) 81 82 # define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 83 84 # define virt_to_page(vaddr) pfn_to_page(PFN_DOWN(virt_to_phys(vaddr))) 85 # define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr))) 86 87 # define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 88 89 #include <asm-generic/memory_model.h> 90 91 #include <asm-generic/getorder.h> 92 93 #endif /* !__ASSEMBLY__ */ 94 95 #endif /* _ASM_NIOS2_PAGE_H */ 96