arch/mips/include/asm/mach-malta/spaces.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2014 Imagination Technologies Ltd.
   7  */
   8
   9 #ifndef _ASM_MALTA_SPACES_H
  10 #define _ASM_MALTA_SPACES_H
  11
  12 #ifdef CONFIG_EVA
  13
  14 /*
  15  * Traditional Malta Board Memory Map for EVA
  16  *
  17  * 0x00000000 - 0x0fffffff: 1st RAM region, 256MB
  18  * 0x10000000 - 0x1bffffff: GIC and CPC Control Registers
  19  * 0x1c000000 - 0x1fffffff: I/O And Flash
  20  * 0x20000000 - 0x7fffffff: 2nd RAM region, 1.5GB
  21  * 0x80000000 - 0xffffffff: Physical memory aliases to 0x0 (2GB)
  22  *
  23  * The kernel is still located in 0x80000000(kseg0). However,
  24  * the physical mask has been shifted to 0x80000000 which exploits the alias
  25  * on the Malta board. As a result of which, we override the __pa_symbol
  26  * to peform direct mapping from virtual to physical addresses. In other
  27  * words, the 0x80000000 virtual address maps to 0x80000000 physical address
  28  * which in turn aliases to 0x0. We do this in order to be able to use a flat
  29  * 2GB of memory (0x80000000 - 0xffffffff) so we can avoid the I/O hole in
  30  * 0x10000000 - 0x1fffffff.
  31  * The last 64KB of physical memory are reserved for correct HIGHMEM
  32  * macros arithmetics.
  33  *
  34  */
  35
  36 #define PAGE_OFFSET     _AC(0x0, UL)
  37 #define PHYS_OFFSET     _AC(0x80000000, UL)
  38 #define HIGHMEM_START   _AC(0xffff0000, UL)
  39
  40 #define __pa_symbol(x)  (RELOC_HIDE((unsigned long)(x), 0))
  41
  42 #endif /* CONFIG_EVA */
  43
  44 #include <asm/mach-generic/spaces.h>
  45
  46 #endif /* _ASM_MALTA_SPACES_H */