1 files changed, 77 insertions, 0 deletions
diff --git a/grub-core/lib/ieee1275/cmos.c b/grub-core/lib/ieee1275/cmos.c
new file mode 100644
index 0000000..328d70a
--- /dev/null
+++ b/grub-core/lib/ieee1275/cmos.c
@@ -0,0 +1,77 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2011  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>
+#include <grub/dl.h>
+#include <grub/ieee1275/ieee1275.h>
+#include <grub/misc.h>
+
+volatile grub_uint8_t *grub_cmos_port = 0;
+
+/* Helper for grub_cmos_find_port.  */
+static int
+grub_cmos_find_port_iter (struct grub_ieee1275_devalias *alias)
+{
+  grub_ieee1275_phandle_t dev;
+  grub_uint32_t addr[2];
+  grub_ssize_t actual;
+  /* Enough to check if it's "m5819" */
+  char compat[100];
+  if (grub_ieee1275_finddevice (alias->path, &dev))
+    return 0;
+  if (grub_ieee1275_get_property (dev, "compatible", compat, sizeof (compat),
+				  0))
+    return 0;
+  if (grub_strcmp (compat, "m5819") != 0)
+    return 0;
+  if (grub_ieee1275_get_integer_property (dev, "address",
+					  addr, sizeof (addr), &actual))
+    return 0;
+  if (actual == 4)
+    {
+      grub_cmos_port = (volatile grub_uint8_t *) (grub_addr_t) addr[0];
+      return 1;
+    }
+
+#if GRUB_CPU_SIZEOF_VOID_P == 8
+  if (actual == 8)
+    {
+      grub_cmos_port = (volatile grub_uint8_t *) 
+	((((grub_addr_t) addr[0]) << 32) | addr[1]);
+      return 1;
+    }
+#else
+  if (actual == 8 && addr[0] == 0)
+    {
+      grub_cmos_port = (volatile grub_uint8_t *) addr[1];
+      return 1;
+    }
+#endif
+  return 0;
+}
+
+grub_err_t
+grub_cmos_find_port (void)
+{
+  grub_ieee1275_devices_iterate (grub_cmos_find_port_iter);
+  if (!grub_cmos_port)
+    return grub_error (GRUB_ERR_IO, "no cmos found");
+  
+  return GRUB_ERR_NONE;
+}