| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |