include/asm-arm/arch-ebsa285/memory.h

   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               UL(0xbf000000)
  50 #define PAGE_OFFSET             UL(0xc0000000)
  51
  52 #elif defined(CONFIG_ARCH_CO285)
  53
  54 /* Task size and page offset at 1.5GB */
  55 #define TASK_SIZE               UL(0x5f000000)
  56 #define PAGE_OFFSET             UL(0x60000000)
  57
  58 #else
  59
  60 #error "Undefined footbridge architecture"
  61
  62 #endif
  63
  64 /*
  65  * Physical DRAM offset.
  66  */
  67 #define PHYS_OFFSET             UL(0x00000000)
  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