memory.h

来自「linux 内核源代码」· C头文件 代码 · 共 50 行

/*
 * include/asm-arm/arch-ks8695/memory.h
 *
 * Copyright (C) 2006 Andrew Victor
 *
 * KS8695 Memory definitions
 *
 * This file is licensed under  the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#ifndef __ASM_ARCH_MEMORY_H
#define __ASM_ARCH_MEMORY_H

#include <asm/hardware.h>

/*
 * Physical SRAM offset.
 */
#define PHYS_OFFSET		KS8695_SDRAM_PA

#ifndef __ASSEMBLY__

#ifdef CONFIG_PCI

/* PCI mappings */
#define __virt_to_bus(x)	((x) - PAGE_OFFSET + KS8695_PCIMEM_PA)
#define __bus_to_virt(x)	((x) - KS8695_PCIMEM_PA + PAGE_OFFSET)

/* Platform-bus mapping */
extern struct bus_type platform_bus_type;
#define is_lbus_device(dev)		(dev && dev->bus == &platform_bus_type)
#define __arch_dma_to_virt(dev, x)	({ is_lbus_device(dev) ? \
					__phys_to_virt(x) : __bus_to_virt(x); })
#define __arch_virt_to_dma(dev, x)	({ is_lbus_device(dev) ? \
					(dma_addr_t)__virt_to_phys(x) : (dma_addr_t)__virt_to_bus(x); })
#define __arch_page_to_dma(dev, x)	__arch_virt_to_dma(dev, page_address(x))

#else

#define __virt_to_bus(x)	__virt_to_phys(x)
#define __bus_to_virt(x)	__phys_to_virt(x)

#endif

#endif

#endif