memory.h

来自「linux 内核源代码」· C头文件 代码 · 共 65 行

/*
 * DaVinci memory space definitions
 *
 * Author: Kevin Hilman, MontaVista Software, Inc. <[e-mail]>
 *
 * 2007 (c) MontaVista Software, Inc. 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

/**************************************************************************
 * Included Files
 **************************************************************************/
#include <asm/page.h>
#include <asm/sizes.h>

/**************************************************************************
 * Definitions
 **************************************************************************/
#define DAVINCI_DDR_BASE    0x80000000
#define DAVINCI_IRAM_BASE   0x00008000 /* ARM Internal RAM */

#define PHYS_OFFSET DAVINCI_DDR_BASE

/*
 * Increase size of DMA-consistent memory region
 */
#define CONSISTENT_DMA_SIZE (14<<20)

#ifndef __ASSEMBLY__
/*
 * Restrict DMA-able region to workaround silicon bug.  The bug
 * restricts buffers available for DMA to video hardware to be
 * below 128M
 */
static inline void
__arch_adjust_zones(int node, unsigned long *size, unsigned long *holes)
{
	unsigned int sz = (128<<20) >> PAGE_SHIFT;

	if (node != 0)
		sz = 0;

	size[1] = size[0] - sz;
	size[0] = sz;
}

#define arch_adjust_zones(node, zone_size, holes) \
        if ((meminfo.bank[0].size >> 20) > 128) __arch_adjust_zones(node, zone_size, holes)

#define ISA_DMA_THRESHOLD	(PHYS_OFFSET + (128<<20) - 1)

#endif

/*
 * Bus address is physical address
 */
#define __virt_to_bus(x)	__virt_to_phys(x)
#define __bus_to_virt(x)	__phys_to_virt(x)

#endif /* __ASM_ARCH_MEMORY_H */