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62 lines
1.4 KiB
62 lines
1.4 KiB
20 years ago
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/*
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* linux/include/asm-arm/arch-ixp4xx/memory.h
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*
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* Copyright (c) 2001-2004 MontaVista Software, Inc.
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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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#include <asm/sizes.h>
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/*
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* Physical DRAM offset.
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*/
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#define PHYS_OFFSET (0x00000000UL)
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#ifndef __ASSEMBLY__
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/*
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* Only first 64MB of memory can be accessed via PCI.
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* We use GFP_DMA to allocate safe buffers to do map/unmap.
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* This is really ugly and we need a better way of specifying
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* DMA-capable regions of memory.
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*/
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static inline void __arch_adjust_zones(int node, unsigned long *zone_size,
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unsigned long *zhole_size)
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{
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unsigned int sz = SZ_64M >> PAGE_SHIFT;
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/*
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* Only adjust if > 64M on current system
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*/
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if (node || (zone_size[0] <= sz))
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return;
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zone_size[1] = zone_size[0] - sz;
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zone_size[0] = sz;
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zhole_size[1] = zhole_size[0];
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zhole_size[0] = 0;
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}
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#define arch_adjust_zones(node, size, holes) \
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__arch_adjust_zones(node, size, holes)
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#define ISA_DMA_THRESHOLD (SZ_64M - 1)
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#endif
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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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* These are dummies for now.
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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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#endif
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