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diff --git a/UnixPkg/Sec/UnixThunk.c b/UnixPkg/Sec/UnixThunk.c
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+/*++
+
+Copyright (c) 2004 - 2006, Intel Corporation
+All rights reserved. This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+Module Name:
+
+ UnixThunk.c
+
+Abstract:
+
+ Since the SEC is the only program in our emulation we
+ must use a Tiano mechanism to export APIs to other modules.
+ This is the role of the EFI_UNIX_THUNK_PROTOCOL.
+
+ The mUnixThunkTable exists so that a change to EFI_UNIX_THUNK_PROTOCOL
+ will cause an error in initializing the array if all the member functions
+ are not added. It looks like adding a element to end and not initializing
+ it may cause the table to be initaliized with the members at the end being
+ set to zero. This is bad as jumping to zero will crash.
+
+
+ gUnix is a a public exported global that contains the initialized
+ data.
+
+--*/
+
+#include "SecMain.h"
+#include "Library/UnixLib.h"
+
+static int settimer_initialized;
+static struct timeval settimer_timeval;
+static void (*settimer_callback)(UINT64 delta);
+
+static void
+settimer_handler (int sig)
+{
+ struct timeval timeval;
+ UINT64 delta;
+
+ gettimeofday (&timeval, NULL);
+ delta = ((UINT64)timeval.tv_sec * 1000) + (timeval.tv_usec / 1000)
+ - ((UINT64)settimer_timeval.tv_sec * 1000)
+ - (settimer_timeval.tv_usec / 1000);
+ settimer_timeval = timeval;
+ if (settimer_callback)
+ (*settimer_callback)(delta);
+}
+
+static
+VOID
+SetTimer (UINT64 PeriodMs, VOID (*CallBack)(UINT64 DeltaMs))
+{
+ struct itimerval timerval;
+
+ if (!settimer_initialized) {
+ struct sigaction act;
+
+ settimer_initialized = 1;
+ act.sa_handler = settimer_handler;
+ act.sa_flags = 0;
+ sigemptyset (&act.sa_mask);
+ if (sigaction (SIGALRM, &act, NULL) != 0) {
+ printf ("SetTimer: sigaction error %s\n", strerror (errno));
+ }
+ if (gettimeofday (&settimer_timeval, NULL) != 0) {
+ printf ("SetTimer: gettimeofday error %s\n", strerror (errno));
+ }
+ }
+ timerval.it_value.tv_sec = PeriodMs / 1000;
+ timerval.it_value.tv_usec = (PeriodMs % 1000) * 1000;
+ timerval.it_value.tv_sec = PeriodMs / 1000;
+ timerval.it_interval = timerval.it_value;
+
+ if (setitimer (ITIMER_REAL, &timerval, NULL) != 0) {
+ printf ("SetTimer: setitimer error %s\n", strerror (errno));
+ }
+ settimer_callback = CallBack;
+}
+
+void
+msSleep (unsigned long Milliseconds)
+{
+ struct timespec ts;
+
+ ts.tv_sec = Milliseconds / 1000;
+ ts.tv_nsec = (Milliseconds % 1000) * 1000000;
+
+ while (nanosleep (&ts, &ts) != 0 && errno == EINTR)
+ ;
+}
+
+void
+GetLocalTime (EFI_TIME *Time)
+{
+ struct tm *tm;
+ time_t t;
+
+ t = time (NULL);
+ tm = localtime (&t);
+
+ Time->Year = 1900 + tm->tm_year;
+ Time->Month = tm->tm_mon;
+ Time->Day = tm->tm_mday;
+ Time->Hour = tm->tm_hour;
+ Time->Minute = tm->tm_min;
+ Time->Second = tm->tm_sec;
+ Time->Nanosecond = 0;
+ Time->TimeZone = timezone;
+ Time->Daylight = (daylight ? EFI_TIME_ADJUST_DAYLIGHT : 0)
+ | (tm->tm_isdst > 0 ? EFI_TIME_IN_DAYLIGHT : 0);
+}
+
+static void
+TzSet (void)
+{
+ static int done = 0;
+ if (!done) {
+ tzset ();
+ done = 1;
+ }
+}
+
+long
+GetTimeZone(void)
+{
+ TzSet ();
+ return timezone;
+}
+
+int
+GetDayLight(void)
+{
+ TzSet ();
+ return daylight;
+}
+
+int
+GetErrno(void)
+{
+ return errno;
+}
+
+extern EFI_STATUS
+UgaCreate(struct _EFI_UNIX_UGA_IO_PROTOCOL **UgaIo, CONST CHAR16 *Title);
+
+EFI_UNIX_THUNK_PROTOCOL mUnixThunkTable = {
+ EFI_UNIX_THUNK_PROTOCOL_SIGNATURE,
+ msSleep, /* Sleep */
+ exit, /* Exit */
+ SetTimer,
+ GetLocalTime,
+ gmtime,
+ GetTimeZone,
+ GetDayLight,
+ (UnixPoll)poll,
+ (UnixRead)read,
+ (UnixWrite)write,
+ getenv,
+ (UnixOpen)open,
+ lseek,
+ ftruncate,
+ close,
+ mkdir,
+ rmdir,
+ unlink,
+ GetErrno,
+ opendir,
+ rewinddir,
+ readdir,
+ closedir,
+ stat,
+ statfs,
+ rename,
+ mktime,
+ fsync,
+ chmod,
+ utime,
+ tcflush,
+ UgaCreate,
+ perror,
+ ioctl,
+ fcntl,
+ cfsetispeed,
+ cfsetospeed,
+ tcgetattr,
+ tcsetattr
+};
+
+
+EFI_UNIX_THUNK_PROTOCOL *gUnix = &mUnixThunkTable;