/* * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2004 Microtronix Datacom Ltd. * * MMU support based on asm/page.h from mips which is: * * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #ifndef _ASM_NIOS2_PAGE_H #define _ASM_NIOS2_PAGE_H #include <linux/pfn.h> #include <linux/const.h> /* * PAGE_SHIFT determines the page size */ #define PAGE_SHIFT 12 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE - 1)) /* * PAGE_OFFSET -- the first address of the first page of memory. */ #define PAGE_OFFSET \ (CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE) #ifndef __ASSEMBLY__ /* * This gives the physical RAM offset. */ #define PHYS_OFFSET CONFIG_NIOS2_MEM_BASE /* * It's normally defined only for FLATMEM config but it's * used in our early mem init code for all memory models. * So always define it. */ #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) #define clear_page(page) memset((page), 0, PAGE_SIZE) #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) struct page; extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page); extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, struct page *to); /* * These are used to make use of C type-checking. */ typedef struct page *pgtable_t; typedef struct { unsigned long pte; } pte_t; typedef struct { unsigned long pgd; } pgd_t; typedef struct { unsigned long pgprot; } pgprot_t; #define pte_val(x) ((x).pte) #define pgd_val(x) ((x).pgd) #define pgprot_val(x) ((x).pgprot) #define __pte(x) ((pte_t) { (x) }) #define __pgd(x) ((pgd_t) { (x) }) #define __pgprot(x) ((pgprot_t) { (x) }) extern unsigned long memory_start; extern unsigned long memory_end; extern unsigned long memory_size; extern struct page *mem_map; # define __pa(x) \ ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) # define __va(x) \ ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) #define page_to_virt(page) \ ((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET) # define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) static inline bool pfn_valid(unsigned long pfn) { /* avoid <linux/mm.h> include hell */ extern unsigned long max_mapnr; unsigned long pfn_offset = ARCH_PFN_OFFSET; return pfn >= pfn_offset && pfn < max_mapnr; } # define virt_to_page(vaddr) pfn_to_page(PFN_DOWN(virt_to_phys(vaddr))) # define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr))) # define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) #include <asm-generic/memory_model.h> #include <asm-generic/getorder.h> #endif /* !__ASSEMBLY__ */ #endif /* _ASM_NIOS2_PAGE_H */