ia64/linux-2.6.18-xen.hg

view include/asm-arm/arch-clps711x/memory.h @ 782:9ab1c319531f

merge with linux-2.6.18-xen.hg
author Isaku Yamahata <yamahata@valinux.co.jp>
date Wed Jan 28 13:07:23 2009 +0900 (2009-01-28)
parents 831230e53067
children
line source
1 /*
2 * linux/include/asm-arm/arch-clps711x/memory.h
3 *
4 * Copyright (C) 1999 ARM Limited
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20 #ifndef __ASM_ARCH_MEMORY_H
21 #define __ASM_ARCH_MEMORY_H
24 /*
25 * Physical DRAM offset.
26 */
27 #define PHYS_OFFSET UL(0xc0000000)
29 /*
30 * Virtual view <-> DMA view memory address translations
31 * virt_to_bus: Used to translate the virtual address to an
32 * address suitable to be passed to set_dma_addr
33 * bus_to_virt: Used to convert an address for DMA operations
34 * to an address that the kernel can use.
35 */
37 #if defined(CONFIG_ARCH_CDB89712)
39 #define __virt_to_bus(x) (x)
40 #define __bus_to_virt(x) (x)
42 #elif defined (CONFIG_ARCH_AUTCPU12)
44 #define __virt_to_bus(x) (x)
45 #define __bus_to_virt(x) (x)
47 #else
49 #define __virt_to_bus(x) ((x) - PAGE_OFFSET)
50 #define __bus_to_virt(x) ((x) + PAGE_OFFSET)
52 #endif
55 /*
56 * Like the SA1100, the EDB7211 has a large gap between physical RAM
57 * banks. In 2.2, the Psion (CL-PS7110) port added custom support for
58 * discontiguous physical memory. In 2.4, we can use the standard
59 * Linux NUMA support.
60 *
61 * This is not necessary for EP7211 implementations with only one used
62 * memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM.
63 */
65 #ifdef CONFIG_DISCONTIGMEM
66 /*
67 * Because of the wide memory address space between physical RAM banks on the
68 * SA1100, it's much more convenient to use Linux's NUMA support to implement
69 * our memory map representation. Assuming all memory nodes have equal access
70 * characteristics, we then have generic discontiguous memory support.
71 *
72 * Of course, all this isn't mandatory for SA1100 implementations with only
73 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
74 *
75 * The nodes are matched with the physical memory bank addresses which are
76 * incidentally the same as virtual addresses.
77 *
78 * node 0: 0xc0000000 - 0xc7ffffff
79 * node 1: 0xc8000000 - 0xcfffffff
80 * node 2: 0xd0000000 - 0xd7ffffff
81 * node 3: 0xd8000000 - 0xdfffffff
82 */
84 /*
85 * Given a kernel address, find the home node of the underlying memory.
86 */
87 #define KVADDR_TO_NID(addr) \
88 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)
90 /*
91 * Given a page frame number, convert it to a node id.
92 */
93 #define PFN_TO_NID(pfn) \
94 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))
96 /*
97 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
98 * and returns the mem_map of that node.
99 */
100 #define ADDR_TO_MAPBASE(kaddr) \
101 NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
103 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
105 /*
106 * Given a kaddr, LOCAL_MAR_NR finds the owning node of the memory
107 * and returns the index corresponding to the appropriate page in the
108 * node's mem_map.
109 */
110 #define LOCAL_MAP_NR(addr) \
111 (((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)
113 /*
114 * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211
115 * uses only one of the two banks (bank #1). However, even within
116 * bank #1, memory is discontiguous.
117 *
118 * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between
119 * them, so we use 24 for the node max shift to get 16MB node sizes.
120 */
121 #define NODE_MAX_MEM_SHIFT 24
122 #define NODE_MAX_MEM_SIZE (1<<NODE_MAX_MEM_SHIFT)
124 #endif /* CONFIG_DISCONTIGMEM */
126 #endif