2 * linux/include/asm-arm/arch-ixp4xx/memory.h
4 * Copyright (c) 2001-2004 MontaVista Software, Inc.
7 #ifndef __ASM_ARCH_MEMORY_H
8 #define __ASM_ARCH_MEMORY_H
10 #include <asm/sizes.h>
13 * Physical DRAM offset.
15 #define PHYS_OFFSET (0x00000000UL)
20 * Only first 64MB of memory can be accessed via PCI.
21 * We use GFP_DMA to allocate safe buffers to do map/unmap.
22 * This is really ugly and we need a better way of specifying
23 * DMA-capable regions of memory.
25 static inline void __arch_adjust_zones(int node, unsigned long *zone_size,
26 unsigned long *zhole_size)
28 unsigned int sz = SZ_64M >> PAGE_SHIFT;
31 * Only adjust if > 64M on current system
33 if (node || (zone_size[0] <= sz))
36 zone_size[1] = zone_size[0] - sz;
38 zhole_size[1] = zhole_size[0];
42 #define arch_adjust_zones(node, size, holes) \
43 __arch_adjust_zones(node, size, holes)
45 #define ISA_DMA_THRESHOLD (SZ_64M - 1)
50 * Virtual view <-> DMA view memory address translations
51 * virt_to_bus: Used to translate the virtual address to an
52 * address suitable to be passed to set_dma_addr
53 * bus_to_virt: Used to convert an address for DMA operations
54 * to an address that the kernel can use.
56 * These are dummies for now.
58 #define __virt_to_bus(x) __virt_to_phys(x)
59 #define __bus_to_virt(x) __phys_to_virt(x)