arch/arm-all/kernel/createcontext.c

   1 /*
   2     Copyright � 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Create an empty usable CPU context, ARM version.
   6     Lang: english
   7 */
   8
   9 #include <aros/kernel.h>
  10 #include <aros/libcall.h>
  11
  12 #include <aros/arm/cpucontext.h>
  13
  14 #include <kernel_base.h>
  15 #include <kernel_objects.h>
  16
  17 AROS_LH0(void *, KrnCreateContext,
  18          struct KernelBase *, KernelBase, 18, Kernel)
  19
  20 {
  21     AROS_LIBFUNC_INIT
  22
  23     struct ExceptionContext *ctx;
  24
  25     /*
  26      * Allocate common data block and FPU data block in one
  27      * chunk. This way we simplify things a lot.
  28      *
  29      * On native ports AROSCPUContext can be simply #define'd to ExceptionContext,
  30      * so we refer struct AROSCPUContext only for size calculation.
  31      */
  32     ctx = krnAllocCPUContext();
  33     if (ctx)
  34     {
  35         ctx->FPUType    = KernelBase->kb_ContextFlags;
  36         ctx->cpsr       = CPUMODE_USER;         /* Initial value for user mode */
  37 #if AROS_BIG_ENDIAN
  38         ctx->cpsr      |= CPUMODE_BIGENDIAN;
  39 #endif
  40         ctx->fpuContext = (APTR)((IPTR)ctx + sizeof(struct AROSCPUContext));
  41     }
  42
  43     return ctx;
  44
  45     AROS_LIBFUNC_EXIT
  46 }