arch/blackfin/include/asm/l1layout.h

   1 /*
   2  * l1layout.h
   3  * Defines a layout of L1 scratchpad memory that userspace can rely on.
   4  */
   5
   6 #ifndef _L1LAYOUT_H_
   7 #define _L1LAYOUT_H_
   8
   9 #include <asm/blackfin.h>
  10
  11 #ifndef CONFIG_SMP
  12 #ifndef __ASSEMBLY__
  13
  14 /* Data that is "mapped" into the process VM at the start of the L1 scratch
  15    memory, so that each process can access it at a fixed address.  Used for
  16    stack checking.  */
  17 struct l1_scratch_task_info
  18 {
  19         /* Points to the start of the stack.  */
  20         void *stack_start;
  21         /* Not updated by the kernel; a user process can modify this to
  22            keep track of the lowest address of the stack pointer during its
  23            runtime.  */
  24         void *lowest_sp;
  25 };
  26
  27 /* A pointer to the structure in memory.  */
  28 #define L1_SCRATCH_TASK_INFO ((struct l1_scratch_task_info *)\
  29                                                 get_l1_scratch_start())
  30
  31 #endif
  32 #endif
  33
  34 #endif