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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * linux/include/asm-arm/arch-ixp4xx/memory.h
3 *
4 * Copyright (c) 2001-2004 MontaVista Software, Inc.
5 */
6
7#ifndef __ASM_ARCH_MEMORY_H
8#define __ASM_ARCH_MEMORY_H
9
10#include <asm/sizes.h>
11
12/*
13 * Physical DRAM offset.
14 */
15#define PHYS_OFFSET (0x00000000UL)
16
17#ifndef __ASSEMBLY__
18
19/*
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.
24 */
25static inline void __arch_adjust_zones(int node, unsigned long *zone_size,
26 unsigned long *zhole_size)
27{
28 unsigned int sz = SZ_64M >> PAGE_SHIFT;
29
30 /*
31 * Only adjust if > 64M on current system
32 */
33 if (node || (zone_size[0] <= sz))
34 return;
35
36 zone_size[1] = zone_size[0] - sz;
37 zone_size[0] = sz;
38 zhole_size[1] = zhole_size[0];
39 zhole_size[0] = 0;
40}
41
42#define arch_adjust_zones(node, size, holes) \
43 __arch_adjust_zones(node, size, holes)
44
45#define ISA_DMA_THRESHOLD (SZ_64M - 1)
46
47#endif
48
49/*
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.
55 *
56 * These are dummies for now.
57 */
58#define __virt_to_bus(x) __virt_to_phys(x)
59#define __bus_to_virt(x) __phys_to_virt(x)
60
61#endif