2 * linux/include/asm-arm/arch-clps711x/mmu.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_MMU_H
21 #define __ASM_ARCH_MMU_H
23 #include <linux/config.h>
28 #define TASK_SIZE (0xbf000000UL)
29 #define TASK_SIZE_26 (0x04000000UL)
32 * This decides where the kernel will search for a free chunk of vm
33 * space during mmap's.
35 #define TASK_UNMAPPED_BASE (0x40000000)
40 #define PAGE_OFFSET (0xc0000000UL)
41 #define PHYS_OFFSET (0xc0000000UL)
44 * On integrator, the dram is contiguous
46 #define __virt_to_phys__is_a_macro
47 #define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET)
48 #define __phys_to_virt__is_a_macro
49 #define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET)
52 * Virtual view <-> DMA view memory address translations
53 * virt_to_bus: Used to translate the virtual address to an
54 * address suitable to be passed to set_dma_addr
55 * bus_to_virt: Used to convert an address for DMA operations
56 * to an address that the kernel can use.
59 #if defined(CONFIG_ARCH_CDB89712)
61 #define __virt_to_bus__is_a_macro
62 #define __virt_to_bus(x) (x)
63 #define __bus_to_virt__is_a_macro
64 #define __bus_to_virt(x) (x)
66 #elif defined (CONFIG_ARCH_AUTCPU12)
68 #define __virt_to_bus__is_a_macro
69 #define __virt_to_bus(x) (x)
70 #define __bus_to_virt__is_a_macro
71 #define __bus_to_virt(x) (x)
75 #define __virt_to_bus__is_a_macro
76 #define __virt_to_bus(x) ((x) - PAGE_OFFSET)
77 #define __bus_to_virt__is_a_macro
78 #define __bus_to_virt(x) ((x) + PAGE_OFFSET)
84 * Like the SA1100, the EDB7211 has a large gap between physical RAM
85 * banks. In 2.2, the Psion (CL-PS7110) port added custom support for
86 * discontiguous physical memory. In 2.4, we can use the standard
89 * This is not necessary for EP7211 implementations with only one used
90 * memory bank. For those systems, simply undefine CONFIG_DISCONTIGMEM.
93 #ifdef CONFIG_DISCONTIGMEM
95 * Because of the wide memory address space between physical RAM banks on the
96 * SA1100, it's much more convenient to use Linux's NUMA support to implement
97 * our memory map representation. Assuming all memory nodes have equal access
98 * characteristics, we then have generic discontiguous memory support.
100 * Of course, all this isn't mandatory for SA1100 implementations with only
101 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
103 * The nodes are matched with the physical memory bank addresses which are
104 * incidentally the same as virtual addresses.
106 * node 0: 0xc0000000 - 0xc7ffffff
107 * node 1: 0xc8000000 - 0xcfffffff
108 * node 2: 0xd0000000 - 0xd7ffffff
109 * node 3: 0xd8000000 - 0xdfffffff
113 * Given a kernel address, find the home node of the underlying memory.
115 #define KVADDR_TO_NID(addr) \
116 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)
119 * Given a page frame number, convert it to a node id.
121 #define PFN_TO_NID(pfn) \
122 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))
125 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
126 * and returns the mem_map of that node.
128 #define ADDR_TO_MAPBASE(kaddr) \
129 NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
131 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
134 * Given a kaddr, LOCAL_MAR_NR finds the owning node of the memory
135 * and returns the index corresponding to the appropriate page in the
138 #define LOCAL_MAP_NR(addr) \
139 (((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)
142 * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211
143 * uses only one of the two banks (bank #1). However, even within
144 * bank #1, memory is discontiguous.
146 * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between
147 * them, so we use 24 for the node max shift to get 16MB node sizes.
149 #define NODE_MAX_MEM_SHIFT 24
150 #define NODE_MAX_MEM_SIZE (1<<NODE_MAX_MEM_SHIFT)
152 #endif /* CONFIG_DISCONTIGMEM */