arch/frv/include/asm/mem-layout.h

   1 /* mem-layout.h: memory layout
   2  *
   3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _ASM_MEM_LAYOUT_H
  13 #define _ASM_MEM_LAYOUT_H
  14
  15 #ifndef __ASSEMBLY__
  16 #define __UL(X) ((unsigned long) (X))
  17 #else
  18 #define __UL(X) (X)
  19 #endif
  20
  21 /*
  22  * PAGE_SHIFT determines the page size
  23  */
  24 #define PAGE_SHIFT                      14
  25
  26 #ifndef __ASSEMBLY__
  27 #define PAGE_SIZE                       (1UL << PAGE_SHIFT)
  28 #else
  29 #define PAGE_SIZE                       (1 << PAGE_SHIFT)
  30 #endif
  31
  32 #define PAGE_MASK                       (~(PAGE_SIZE-1))
  33
  34 /*
  35  * the slab must be aligned such that load- and store-double instructions don't
  36  * fault if used
  37  */
  38 #define ARCH_DMA_MINALIGN               L1_CACHE_BYTES
  39 #define ARCH_SLAB_MINALIGN              L1_CACHE_BYTES
  40
  41 /*****************************************************************************/
  42 /*
  43  * virtual memory layout from kernel's point of view
  44  */
  45 #define PAGE_OFFSET                     ((unsigned long) &__page_offset)
  46
  47 #ifdef CONFIG_MMU
  48
  49 /* see Documentation/frv/mmu-layout.txt */
  50 #define KERNEL_LOWMEM_START             __UL(0xc0000000)
  51 #define KERNEL_LOWMEM_END               __UL(0xd0000000)
  52 #define VMALLOC_START                   __UL(0xd0000000)
  53 #define VMALLOC_END                     __UL(0xd8000000)
  54 #define PKMAP_BASE                      __UL(0xd8000000)
  55 #define PKMAP_END                       __UL(0xdc000000)
  56 #define KMAP_ATOMIC_SECONDARY_FRAME     __UL(0xdc000000)
  57 #define KMAP_ATOMIC_PRIMARY_FRAME       __UL(0xdd000000)
  58
  59 #endif
  60
  61 #define KERNEL_IO_START                 __UL(0xe0000000)
  62
  63
  64 /*****************************************************************************/
  65 /*
  66  * memory layout from userspace's point of view
  67  */
  68 #define BRK_BASE                        __UL(2 * 1024 * 1024 + PAGE_SIZE)
  69 #define STACK_TOP                       __UL(2 * 1024 * 1024)
  70 #define STACK_TOP_MAX                   __UL(0xc0000000)
  71
  72 /* userspace process size */
  73 #ifdef CONFIG_MMU
  74 #define TASK_SIZE                       (PAGE_OFFSET)
  75 #else
  76 #define TASK_SIZE                       __UL(0xFFFFFFFFUL)
  77 #endif
  78
  79 /* base of area at which unspecified mmaps will start */
  80 #ifdef CONFIG_BINFMT_ELF_FDPIC
  81 #define TASK_UNMAPPED_BASE              __UL(16 * 1024 * 1024)
  82 #else
  83 #define TASK_UNMAPPED_BASE              __UL(TASK_SIZE / 3)
  84 #endif
  85
  86 #endif /* _ASM_MEM_LAYOUT_H */