automake commit without merge history

grub-core/lib/cmos_datetime.c

@@ -0,0 +1,155 @@
+/* kern/cmos_datetime.c - CMOS datetime function.
+ *
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2008,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/datetime.h>
+#include <grub/cmos.h>
+
+grub_err_t
+grub_get_datetime (struct grub_datetime *datetime)
+{
+  int is_bcd, is_12hour;
+  grub_uint8_t value, flag;
+
+  flag = grub_cmos_read (GRUB_CMOS_INDEX_STATUS_B);
+
+  is_bcd = ! (flag & GRUB_CMOS_STATUS_B_BINARY);
+
+  value = grub_cmos_read (GRUB_CMOS_INDEX_YEAR);
+  if (is_bcd)
+    value = grub_bcd_to_num (value);
+
+  datetime->year = value;
+  datetime->year += (value < 80) ? 2000 : 1900;
+
+  value = grub_cmos_read (GRUB_CMOS_INDEX_MONTH);
+  if (is_bcd)
+    value = grub_bcd_to_num (value);
+
+  datetime->month = value;
+
+  value = grub_cmos_read (GRUB_CMOS_INDEX_DAY_OF_MONTH);
+  if (is_bcd)
+    value = grub_bcd_to_num (value);
+
+  datetime->day = value;
+
+  is_12hour = ! (flag & GRUB_CMOS_STATUS_B_24HOUR);
+
+  value = grub_cmos_read (GRUB_CMOS_INDEX_HOUR);
+  if (is_12hour)
+    {
+      is_12hour = (value & 0x80);
+
+      value &= 0x7F;
+      value--;
+    }
+
+  if (is_bcd)
+    value = grub_bcd_to_num (value);
+
+  if (is_12hour)
+    value += 12;
+
+  datetime->hour = value;
+
+  value = grub_cmos_read (GRUB_CMOS_INDEX_MINUTE);
+  if (is_bcd)
+    value = grub_bcd_to_num (value);
+
+  datetime->minute = value;
+
+  value = grub_cmos_read (GRUB_CMOS_INDEX_SECOND);
+  if (is_bcd)
+    value = grub_bcd_to_num (value);
+
+  datetime->second = value;
+
+  return 0;
+}
+
+grub_err_t
+grub_set_datetime (struct grub_datetime *datetime)
+{
+  int is_bcd, is_12hour;
+  grub_uint8_t value, flag;
+
+  flag = grub_cmos_read (GRUB_CMOS_INDEX_STATUS_B);
+
+  is_bcd = ! (flag & GRUB_CMOS_STATUS_B_BINARY);
+
+  value = ((datetime->year >= 2000) ? datetime->year - 2000 :
+           datetime->year - 1900);
+
+  if (is_bcd)
+    value = grub_num_to_bcd (value);
+
+  grub_cmos_write (GRUB_CMOS_INDEX_YEAR, value);
+
+  value = datetime->month;
+
+  if (is_bcd)
+    value = grub_num_to_bcd (value);
+
+  grub_cmos_write (GRUB_CMOS_INDEX_MONTH, value);
+
+  value = datetime->day;
+
+  if (is_bcd)
+    value = grub_num_to_bcd (value);
+
+  grub_cmos_write (GRUB_CMOS_INDEX_DAY_OF_MONTH, value);
+
+  value = datetime->hour;
+
+  is_12hour = (! (flag & GRUB_CMOS_STATUS_B_24HOUR));
+
+  if (is_12hour)
+    {
+      value++;
+
+      if (value > 12)
+        value -= 12;
+      else
+        is_12hour = 0;
+    }
+
+  if (is_bcd)
+    value = grub_num_to_bcd (value);
+
+  if (is_12hour)
+    value |= 0x80;
+
+  grub_cmos_write (GRUB_CMOS_INDEX_HOUR, value);
+
+  value = datetime->minute;
+
+  if (is_bcd)
+    value = grub_num_to_bcd (value);
+
+  grub_cmos_write (GRUB_CMOS_INDEX_MINUTE, value);
+
+  value = datetime->second;
+
+  if (is_bcd)
+    value = grub_num_to_bcd (value);
+
+  grub_cmos_write (GRUB_CMOS_INDEX_SECOND, value);
+
+  return 0;
+}