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-rw-r--r--include/asm-arm/arch-pxa/memory.h76
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diff --git a/include/asm-arm/arch-pxa/memory.h b/include/asm-arm/arch-pxa/memory.h
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1/*
2 * linux/include/asm-arm/arch-pxa/memory.h
3 *
4 * Author: Nicolas Pitre
5 * Copyright: (C) 2001 MontaVista Software Inc.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#ifndef __ASM_ARCH_MEMORY_H
13#define __ASM_ARCH_MEMORY_H
14
15/*
16 * Physical DRAM offset.
17 */
18#define PHYS_OFFSET (0xa0000000UL)
19
20/*
21 * Virtual view <-> DMA view memory address translations
22 * virt_to_bus: Used to translate the virtual address to an
23 * address suitable to be passed to set_dma_addr
24 * bus_to_virt: Used to convert an address for DMA operations
25 * to an address that the kernel can use.
26 */
27#define __virt_to_bus(x) __virt_to_phys(x)
28#define __bus_to_virt(x) __phys_to_virt(x)
29
30#ifdef CONFIG_DISCONTIGMEM
31/*
32 * The nodes are matched with the physical SDRAM banks as follows:
33 *
34 * node 0: 0xa0000000-0xa3ffffff --> 0xc0000000-0xc3ffffff
35 * node 1: 0xa4000000-0xa7ffffff --> 0xc4000000-0xc7ffffff
36 * node 2: 0xa8000000-0xabffffff --> 0xc8000000-0xcbffffff
37 * node 3: 0xac000000-0xafffffff --> 0xcc000000-0xcfffffff
38 */
39
40/*
41 * Given a kernel address, find the home node of the underlying memory.
42 */
43#define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 26)
44
45/*
46 * Given a page frame number, convert it to a node id.
47 */
48#define PFN_TO_NID(pfn) (((pfn) - PHYS_PFN_OFFSET) >> (26 - PAGE_SHIFT))
49
50/*
51 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
52 * and returns the mem_map of that node.
53 */
54#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
55
56/*
57 * Given a page frame number, find the owning node of the memory
58 * and returns the mem_map of that node.
59 */
60#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
61
62/*
63 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
64 * and returns the index corresponding to the appropriate page in the
65 * node's mem_map.
66 */
67#define LOCAL_MAP_NR(addr) \
68 (((unsigned long)(addr) & 0x03ffffff) >> PAGE_SHIFT)
69
70#else
71
72#define PFN_TO_NID(addr) (0)
73
74#endif
75
76#endif