[efi] Add EFI time source

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/src/interface/efi/efi_time.c b/src/interface/efi/efi_time.c
new file mode 100644
index 000000000..983a0ef5c
--- /dev/null
+++ b/src/interface/efi/efi_time.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <ipxe/time.h>
+#include <ipxe/efi/efi.h>
+
+/** @file
+ *
+ * EFI time source
+ *
+ */
+
+/**
+ * Get current time in seconds
+ *
+ * @ret time		Time, in seconds
+ */
+static time_t efi_get_time ( void ) {
+	EFI_RUNTIME_SERVICES *rs = efi_systab->RuntimeServices;
+	EFI_TIME time;
+	struct tm tm;
+	EFI_STATUS efirc;
+	int rc;
+
+	/* Get current time and date */
+	if ( ( efirc = rs->GetTime ( &time, NULL ) ) != 0 ) {
+		rc = -EEFI ( efirc );
+		DBGC ( rs, "EFITIME could not get system time: %s\n",
+		       strerror ( rc ) );
+		/* Nothing meaningful we can return */
+		return 0;
+	}
+
+	/* Construct broken-down time */
+	memset ( &tm, 0, sizeof ( tm ) );
+	tm.tm_sec = time.Second;
+	tm.tm_min = time.Minute;
+	tm.tm_hour = time.Hour;
+	tm.tm_mday = time.Day;
+	tm.tm_mon = ( time.Month - 1 );
+	tm.tm_year = ( time.Year - 1900 );
+	DBGC ( rs, "EFITIME is %04d-%02d-%02d %02d:%02d:%02d\n",
+	       ( tm.tm_year + 1900 ), ( tm.tm_mon + 1 ),
+	       tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec );
+
+	/* Convert to seconds since the Epoch */
+	return mktime ( &tm );
+}
+
+PROVIDE_TIME ( efi, time_now, efi_get_time );