/* * linux/include/asm-arm/arch-ixp4xx/memory.h * * Copyright (c) 2001-2004 MontaVista Software, Inc. */ #ifndef __ASM_ARCH_MEMORY_H #define __ASM_ARCH_MEMORY_H #include <asm/sizes.h> /* * Physical DRAM offset. */ #define PHYS_OFFSET (0x00000000UL) #ifndef __ASSEMBLY__ /* * Only first 64MB of memory can be accessed via PCI. * We use GFP_DMA to allocate safe buffers to do map/unmap. * This is really ugly and we need a better way of specifying * DMA-capable regions of memory. */ static inline void __arch_adjust_zones(int node, unsigned long *zone_size, unsigned long *zhole_size) { unsigned int sz = SZ_64M >> PAGE_SHIFT; /* * Only adjust if > 64M on current system */ if (node || (zone_size[0] <= sz)) return; zone_size[1] = zone_size[0] - sz; zone_size[0] = sz; zhole_size[1] = zhole_size[0]; zhole_size[0] = 0; } #define arch_adjust_zones(node, size, holes) \ __arch_adjust_zones(node, size, holes) #define ISA_DMA_THRESHOLD (SZ_64M - 1) #endif /* * Virtual view <-> DMA view memory address translations * virt_to_bus: Used to translate the virtual address to an * address suitable to be passed to set_dma_addr * bus_to_virt: Used to convert an address for DMA operations * to an address that the kernel can use. * * These are dummies for now. */ #define __virt_to_bus(x) __virt_to_phys(x) #define __bus_to_virt(x) __phys_to_virt(x) #endif