102 строки
2.9 KiB
C
102 строки
2.9 KiB
C
/*
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* linux/include/asm-arm26/memory.h
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*
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* Copyright (C) 2000-2002 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Note: this file should not be included by non-asm/.h files
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*/
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#ifndef __ASM_ARM_MEMORY_H
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#define __ASM_ARM_MEMORY_H
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/*
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* User space: 26MB
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*/
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#define TASK_SIZE (0x01a00000UL)
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/*
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* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
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/*
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* Page offset: 32MB
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*/
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#define PAGE_OFFSET (0x02000000UL)
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#define PHYS_OFFSET (0x02000000UL)
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#define PHYS_TO_NID(addr) (0)
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/*
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* PFNs are used to describe any physical page; this means
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* PFN 0 == physical address 0.
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*
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* This is the PFN of the first RAM page in the kernel
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* direct-mapped view. We assume this is the first page
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* of RAM in the mem_map as well.
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*/
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#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
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/*
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* These are *only* valid on the kernel direct mapped RAM memory.
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*/
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static inline unsigned long virt_to_phys(void *x)
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{
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return (unsigned long)x;
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}
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static inline void *phys_to_virt(unsigned long x)
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{
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return (void *)((unsigned long)x);
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}
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#define __pa(x) (unsigned long)(x)
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#define __va(x) ((void *)(unsigned long)(x))
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/*
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* Virtual <-> DMA view memory address translations
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* Again, these are *only* valid on the kernel direct mapped RAM
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* memory. Use of these is *depreciated*.
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*/
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#define virt_to_bus(x) ((unsigned long)(x))
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#define bus_to_virt(x) ((void *)((unsigned long)(x)))
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/*
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* Conversion between a struct page and a physical address.
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*
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* Note: when converting an unknown physical address to a
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* struct page, the resulting pointer must be validated
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* using VALID_PAGE(). It must return an invalid struct page
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* for any physical address not corresponding to a system
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* RAM address.
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*
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* page_to_pfn(page) convert a struct page * to a PFN number
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* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
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* pfn_valid(pfn) indicates whether a PFN number is valid
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*
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* virt_to_page(k) convert a _valid_ virtual address to struct page *
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* virt_addr_valid(k) indicates whether a virtual address is valid
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*/
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#define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
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#define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
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#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
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#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
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#define virt_addr_valid(kaddr) ((int)(kaddr) >= PAGE_OFFSET && (int)(kaddr) < (unsigned long)high_memory)
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/*
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* For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
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*/
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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/*
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* We should really eliminate virt_to_bus() here - it's depreciated.
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*/
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#define page_to_bus(page) (page_address(page))
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#endif
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