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