release/src-rt-6.x.4708/linux/linux-2.6.36/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.  */
  20 struct 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