Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/include/asm-arm/arch-ebsa285/memory.h |
| 3 | * |
| 4 | * Copyright (C) 1996-1999 Russell King. |
| 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 version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * Changelog: |
| 11 | * 20-Oct-1996 RMK Created |
| 12 | * 31-Dec-1997 RMK Fixed definitions to reduce warnings. |
| 13 | * 17-May-1998 DAG Added __virt_to_bus and __bus_to_virt functions. |
| 14 | * 21-Nov-1998 RMK Changed __virt_to_bus and __bus_to_virt to macros. |
| 15 | * 21-Mar-1999 RMK Added PAGE_OFFSET for co285 architecture. |
| 16 | * Renamed to memory.h |
| 17 | * Moved PAGE_OFFSET and TASK_SIZE here |
| 18 | */ |
| 19 | #ifndef __ASM_ARCH_MEMORY_H |
| 20 | #define __ASM_ARCH_MEMORY_H |
| 21 | |
| 22 | #include <linux/config.h> |
| 23 | |
| 24 | #if defined(CONFIG_FOOTBRIDGE_ADDIN) |
| 25 | /* |
| 26 | * If we may be using add-in footbridge mode, then we must |
| 27 | * use the out-of-line translation that makes use of the |
| 28 | * PCI BAR |
| 29 | */ |
| 30 | #ifndef __ASSEMBLY__ |
| 31 | extern unsigned long __virt_to_bus(unsigned long); |
| 32 | extern unsigned long __bus_to_virt(unsigned long); |
| 33 | #endif |
| 34 | |
| 35 | #elif defined(CONFIG_FOOTBRIDGE_HOST) |
| 36 | |
| 37 | #define __virt_to_bus(x) ((x) - 0xe0000000) |
| 38 | #define __bus_to_virt(x) ((x) + 0xe0000000) |
| 39 | |
| 40 | #else |
| 41 | |
| 42 | #error "Undefined footbridge mode" |
| 43 | |
| 44 | #endif |
| 45 | |
| 46 | #if defined(CONFIG_ARCH_FOOTBRIDGE) |
| 47 | |
| 48 | /* Task size and page offset at 3GB */ |
| 49 | #define TASK_SIZE (0xbf000000UL) |
| 50 | #define PAGE_OFFSET (0xc0000000UL) |
| 51 | |
| 52 | #elif defined(CONFIG_ARCH_CO285) |
| 53 | |
| 54 | /* Task size and page offset at 1.5GB */ |
| 55 | #define TASK_SIZE (0x5f000000UL) |
| 56 | #define PAGE_OFFSET (0x60000000UL) |
| 57 | |
| 58 | #else |
| 59 | |
| 60 | #error "Undefined footbridge architecture" |
| 61 | |
| 62 | #endif |
| 63 | |
| 64 | /* |
| 65 | * Physical DRAM offset. |
| 66 | */ |
| 67 | #define PHYS_OFFSET (0x00000000UL) |
| 68 | |
| 69 | /* |
| 70 | * This decides where the kernel will search for a free chunk of vm |
| 71 | * space during mmap's. |
| 72 | */ |
| 73 | #define TASK_UNMAPPED_BASE ((TASK_SIZE + 0x01000000) / 3) |
| 74 | |
| 75 | #endif |