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 51struct page; 52 53extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page); 54extern 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 */ 60typedef struct page *pgtable_t; 61typedef struct { unsigned long pte; } pte_t; 62typedef struct { unsigned long pgd; } pgd_t; 63typedef 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 73extern unsigned long memory_start; 74extern unsigned long memory_end; 75extern unsigned long memory_size; 76 77extern struct page *mem_map; 78 79#endif /* !__ASSEMBLY__ */ 80 81# define __pa(x) \ 82 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 83# define __va(x) \ 84 ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 85 86#define page_to_virt(page) \ 87 ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET) 88 89# define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 90# define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && \ 91 (pfn) < max_mapnr) 92 93# define virt_to_page(vaddr) pfn_to_page(PFN_DOWN(virt_to_phys(vaddr))) 94# define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr))) 95 96# define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 97 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 98 99# define UNCAC_ADDR(addr) \ 100 ((void *)((unsigned)(addr) | CONFIG_NIOS2_IO_REGION_BASE)) 101# define CAC_ADDR(addr) \ 102 ((void *)(((unsigned)(addr) & ~CONFIG_NIOS2_IO_REGION_BASE) | \ 103 CONFIG_NIOS2_KERNEL_REGION_BASE)) 104 105#include <asm-generic/memory_model.h> 106 107#include <asm-generic/getorder.h> 108 109#endif /* _ASM_NIOS2_PAGE_H */ 110