ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / include / asm-arm / arch-clps711x / memory.h
blob42768cc8bfb41aecf34eda2a5130b72a3fcdd94b
1 /*
2 * linux/include/asm-arm/arch-clps711x/memory.h
4 * Copyright (C) 1999 ARM Limited
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.
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.
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
20 #ifndef __ASM_ARCH_MEMORY_H
21 #define __ASM_ARCH_MEMORY_H
25 * Physical DRAM offset.
27 #define PHYS_OFFSET UL(0xc0000000)
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.
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
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.
61 * This is not necessary for EP7211 implementations with only one used
62 * memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM.
66 * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211
67 * uses only one of the two banks (bank #1). However, even within
68 * bank #1, memory is discontiguous.
70 * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between
71 * them, so we use 24 for the node max shift to get 16MB node sizes.
75 * Because of the wide memory address space between physical RAM banks on the
76 * SA1100, it's much more convenient to use Linux's NUMA support to implement
77 * our memory map representation. Assuming all memory nodes have equal access
78 * characteristics, we then have generic discontiguous memory support.
80 * Of course, all this isn't mandatory for SA1100 implementations with only
81 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
83 * The nodes are matched with the physical memory bank addresses which are
84 * incidentally the same as virtual addresses.
86 * node 0: 0xc0000000 - 0xc7ffffff
87 * node 1: 0xc8000000 - 0xcfffffff
88 * node 2: 0xd0000000 - 0xd7ffffff
89 * node 3: 0xd8000000 - 0xdfffffff
91 #define NODE_MEM_SIZE_BITS 24
93 #endif