arch/i386-all/exec/cpu_init.c

   1 /*
   2     Copyright © 1995-2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/debug.h>
   7 #include <aros/symbolsets.h>
   8 #include <proto/exec.h>
   9
  10 extern void AROS_SLIB_ENTRY(CopyMem_SSE, Exec, 104)();
  11 extern void AROS_SLIB_ENTRY(CopyMemQuick_SSE, Exec, 105)();
  12
  13 static int cpu_Init(struct ExecBase *SysBase)
  14 {
  15     /*
  16      * Here we want to check what features are supported by our CPU.
  17      * The idea is simple: we check flags of own CPU context. If kernel.resource
  18      * detects SSE, it allocates additional storage for SSE contexts and sets ECF_FPX
  19      * flag in the context structure.
  20      * We do this because of two reasons:
  21      * 1. processor.resource is not up yet.
  22      * 2. We are exec, and we know what to do with our own internal structures. ;-)
  23      * Normal applications should use processor.resource instead.
  24      */
  25     struct Task *me = FindTask(NULL);
  26     struct ExceptionContext *ctx = me->tc_UnionETask.tc_ETask->et_RegFrame;
  27
  28     if (ctx->Flags & ECF_FPX)
  29     {
  30         D(bug("[exec] SSE detected\n"));
  31
  32         /* Use SSE version of CopyMem() and CopyMemQuick() */
  33         SetFunction(&SysBase->LibNode, -104*LIB_VECTSIZE, AROS_SLIB_ENTRY(CopyMem_SSE, Exec, 104));
  34         SetFunction(&SysBase->LibNode, -105*LIB_VECTSIZE, AROS_SLIB_ENTRY(CopyMemQuick_SSE, Exec, 105));
  35     }
  36
  37     return TRUE;
  38 }
  39
  40 ADD2INITLIB(cpu_Init, 0);