LXR linux/arch/blackfin/include/asm/l1layout.h

   1/*
   2 * Defines a layout of L1 scratchpad memory that userspace can rely on.
   3 *
   4 * Copyright 2006-2008 Analog Devices Inc.
   5 *
   6 * Licensed under the GPL-2 or later.
   7 */
   8
   9#ifndef _L1LAYOUT_H_
  10#define _L1LAYOUT_H_
  11
  12#include <asm/blackfin.h>
  13
  14#ifndef CONFIG_SMP
  15#ifndef __ASSEMBLY__
  16
  17/* Data that is "mapped" into the process VM at the start of the L1 scratch
  18   memory, so that each process can access it at a fixed address.  Used for
  19   stack checking.  */
  20struct l1_scratch_task_info
  21{
  22        /* Points to the start of the stack.  */
  23        void *stack_start;
  24        /* Not updated by the kernel; a user process can modify this to
  25           keep track of the lowest address of the stack pointer during its
  26           runtime.  */
  27        void *lowest_sp;
  28};
  29
  30/* A pointer to the structure in memory.  */
  31#define L1_SCRATCH_TASK_INFO ((struct l1_scratch_task_info *)\
  32                                                get_l1_scratch_start())
  33
  34#endif
  35#endif
  36
  37#endif
  38