rom/kernel/createcontext.c

   1 /*
   2     Copyright © 1995-2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6 */
   7
   8 #include <aros/kernel.h>
   9 #include <aros/libcall.h>
  10
  11 #include <kernel_base.h>
  12 #include <kernel_cpu.h>
  13 #include <kernel_objects.h>
  14
  15 /*****************************************************************************
  16
  17     NAME */
  18 #include <proto/kernel.h>
  19
  20         AROS_LH0(void *, KrnCreateContext,
  21
  22 /*  SYNOPSIS */
  23
  24 /*  LOCATION */
  25         struct KernelBase *, KernelBase, 18, Kernel)
  26
  27 /*  FUNCTION
  28         Allocate and initialize CPU context storage area.
  29
  30     INPUTS
  31         None.
  32
  33     RESULT
  34         A pointer to a CPU context storage area.
  35
  36     NOTES
  37         CPU context storage is considered private and accessible
  38         only from within supevisor mode.
  39
  40     EXAMPLE
  41
  42     BUGS
  43
  44     SEE ALSO
  45         KrnDeleteContext()
  46
  47     INTERNALS
  48
  49 ******************************************************************************/
  50 {
  51     AROS_LIBFUNC_INIT
  52
  53     struct AROSCPUContext *ctx;
  54     cpumode_t mode = goSuper();
  55
  56     /* Our context is accessible only in supervisor mode */
  57     ctx = krnAllocCPUContext();
  58
  59     /* Initialize the storage if needed */
  60 #ifdef PREPARE_INITIAL_CONTEXT
  61     if (ctx)
  62         PREPARE_INITIAL_CONTEXT(ctx);
  63 #endif
  64
  65     goBack(mode);
  66
  67     return ctx;
  68
  69     AROS_LIBFUNC_EXIT
  70 }