mirror of https://gitee.com/openkylin/linux.git
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
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* linux/include/asm-arm/arch-pxa/memory.h
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*
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* Author: Nicolas Pitre
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* Copyright: (C) 2001 MontaVista Software Inc.
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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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#ifndef __ASM_ARCH_MEMORY_H
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#define __ASM_ARCH_MEMORY_H
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/*
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* Physical DRAM offset.
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*/
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#define PHYS_OFFSET UL(0xa0000000)
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/*
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* Virtual view <-> DMA view memory address translations
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* virt_to_bus: Used to translate the virtual address to an
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* address suitable to be passed to set_dma_addr
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* bus_to_virt: Used to convert an address for DMA operations
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* to an address that the kernel can use.
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*/
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#define __virt_to_bus(x) __virt_to_phys(x)
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#define __bus_to_virt(x) __phys_to_virt(x)
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* The nodes are matched with the physical SDRAM banks as follows:
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*
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* node 0: 0xa0000000-0xa3ffffff --> 0xc0000000-0xc3ffffff
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* node 1: 0xa4000000-0xa7ffffff --> 0xc4000000-0xc7ffffff
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* node 2: 0xa8000000-0xabffffff --> 0xc8000000-0xcbffffff
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* node 3: 0xac000000-0xafffffff --> 0xcc000000-0xcfffffff
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*/
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/*
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* Given a kernel address, find the home node of the underlying memory.
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*/
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#define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 26)
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/*
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* Given a page frame number, convert it to a node id.
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*/
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#define PFN_TO_NID(pfn) (((pfn) - PHYS_PFN_OFFSET) >> (26 - PAGE_SHIFT))
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/*
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* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
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* and returns the mem_map of that node.
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*/
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#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
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/*
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* Given a page frame number, find the owning node of the memory
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* and returns the mem_map of that node.
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*/
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#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
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/*
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* Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
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* and returns the index corresponding to the appropriate page in the
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* node's mem_map.
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*/
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#define LOCAL_MAP_NR(addr) \
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(((unsigned long)(addr) & 0x03ffffff) >> PAGE_SHIFT)
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#endif
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#endif
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