b7dc96d753
Most architectures have fairly simple discontiguous memory - a simple set of successive regions each containing some memory. These can be described simply as a log2 of their maximum size, along with the base address of the first region and the number of regions. The base address is already described by PHYS_PFN_OFFSET, and the number of regions via the MAX_NUMNODES and the number of online nodes. If we then supply the log2 of their maximum size, all the other discontigmem macros can move into generic code. There is one exception: lh7a40x seems to have a more complicated setup; this is left alone. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* include/asm-arm/arch-lh7a40x/memory.h
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*
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* Copyright (C) 2004 Coastal Environmental Systems
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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*
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* Refer to <file:Documentation/arm/Sharp-LH/SDRAM> for more information.
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*
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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(0xc0000000)
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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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* Given a kernel address, find the home node of the underlying memory.
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*/
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# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
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# define KVADDR_TO_NID(addr) \
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( ((((unsigned long) (addr) - PAGE_OFFSET) >> 24) & 1)\
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| ((((unsigned long) (addr) - PAGE_OFFSET) >> 25) & ~1))
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# else /* 2 banks per node */
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# define KVADDR_TO_NID(addr) \
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(((unsigned long) (addr) - PAGE_OFFSET) >> 26)
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# endif
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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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# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
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# define PFN_TO_NID(pfn) \
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(((((pfn) - PHYS_PFN_OFFSET) >> (24 - PAGE_SHIFT)) & 1)\
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| ((((pfn) - PHYS_PFN_OFFSET) >> (25 - PAGE_SHIFT)) & ~1))
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# else /* 2 banks per node */
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# define PFN_TO_NID(pfn) \
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(((pfn) - PHYS_PFN_OFFSET) >> (26 - PAGE_SHIFT))
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#endif
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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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# ifdef CONFIG_LH7A40X_ONE_BANK_PER_NODE
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# define LOCAL_MAP_NR(addr) \
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(((unsigned long)(addr) & 0x003fffff) >> PAGE_SHIFT)
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# else /* 2 banks per node */
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# define LOCAL_MAP_NR(addr) \
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(((unsigned long)(addr) & 0x01ffffff) >> PAGE_SHIFT)
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# endif
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#endif
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#endif
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