arch/i386-pc/exec/enable.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: i386unix version of Enable()
   6     Lang: english
   7 */
   8
   9 #include <exec/tasks.h>
  10 #include <exec/execbase.h>
  11 #include <aros/libcall.h>
  12 #include <aros/atomic.h>
  13 #include <aros/debug.h>
  14 #include <asm/segments.h>
  15 #include <proto/exec.h>
  16 #include "exec_intern.h"
  17
  18 void Exec_Permit_Supervisor();
  19
  20 #undef  Exec
  21 #ifdef UseExecstubs
  22 #    define Exec _Exec
  23 #endif
  24
  25 AROS_LH0(void, Enable,
  26     struct ExecBase *, SysBase, 21, Exec)
  27 {
  28 #undef Exec
  29     AROS_LIBFUNC_INIT
  30
  31     AROS_ATOMIC_DEC(SysBase->IDNestCnt);
  32
  33     if(SysBase->IDNestCnt < 0)
  34     {
  35         __asm__ __volatile__ ("sti");
  36
  37         /* There's no dff09c like thing in x86 native which would allow
  38            us to set delayed (mark it as pending but it gets triggered
  39            only once interrupts are enabled again) software interrupt,
  40            so we check it manually here in Enable() == same stuff as
  41            in Permit(). */
  42
  43         if ((SysBase->TDNestCnt < 0) && (SysBase->AttnResched & 0x80))
  44         {
  45             if (IN_USER_MODE) Supervisor(Exec_Permit_Supervisor);
  46         }
  47
  48         if (SysBase->SysFlags & SFF_SoftInt)
  49         {
  50             if (IN_USER_MODE)
  51             {
  52                 /* sys_Cause */
  53                 __asm__ __volatile__ ("movl $0,%%eax\n\tint $0x80":::"eax","memory");
  54             }
  55         }
  56     }
  57
  58     AROS_LIBFUNC_EXIT
  59 }