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-rw-r--r--board/hmi1001/hmi1001.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/board/hmi1001/hmi1001.c b/board/hmi1001/hmi1001.c
index fca11d0..6b1fbfd 100644
--- a/board/hmi1001/hmi1001.c
+++ b/board/hmi1001/hmi1001.c
@@ -156,8 +156,126 @@ int checkboard (void)
return 0;
}
+#ifdef CONFIG_PREBOOT
+
+static uchar kbd_magic_prefix[] = "key_magic";
+static uchar kbd_command_prefix[] = "key_cmd";
+
+#define S1_ROT 0xf0
+#define S2_Q 0x40
+#define S2_M 0x20
+
+struct kbd_data_t {
+ char s1;
+ char s2;
+};
+
+struct kbd_data_t* get_keys (struct kbd_data_t *kbd_data)
+{
+ kbd_data->s1 = *((volatile uchar*)(CFG_STATUS1_BASE));
+ kbd_data->s2 = *((volatile uchar*)(CFG_STATUS2_BASE));
+
+ return kbd_data;
+}
+
+static int compare_magic (struct kbd_data_t *kbd_data, uchar *str)
+{
+ char s1 = str[0];
+ char s2;
+
+ if (s1 >= '0' && s1 <= '9')
+ s1 -= '0';
+ else if (s1 >= 'a' && s1 <= 'f')
+ s1 = s1 - 'a' + 10;
+ else if (s1 >= 'A' && s1 <= 'F')
+ s1 = s1 - 'A' + 10;
+ else
+ return -1;
+
+ if (((S1_ROT & kbd_data->s1) >> 4) != s1)
+ return -1;
+
+ s2 = (S2_Q | S2_M) & kbd_data->s2;
+
+ switch (str[1]) {
+ case 'q':
+ case 'Q':
+ if (s2 == S2_Q)
+ return -1;
+ break;
+ case 'm':
+ case 'M':
+ if (s2 == S2_M)
+ return -1;
+ break;
+ case '\0':
+ if (s2 == (S2_Q | S2_M))
+ return 0;
+ default:
+ return -1;
+ }
+
+ if (str[2])
+ return -1;
+
+ return 0;
+}
+
+static uchar *key_match (const struct kbd_data_t *kbd_data)
+{
+ uchar magic[sizeof (kbd_magic_prefix) + 1];
+ uchar *suffix;
+ uchar *kbd_magic_keys;
+
+ /*
+ * The following string defines the characters that can be appended
+ * to "key_magic" to form the names of environment variables that
+ * hold "magic" key codes, i. e. such key codes that can cause
+ * pre-boot actions. If the string is empty (""), then only
+ * "key_magic" is checked (old behaviour); the string "125" causes
+ * checks for "key_magic1", "key_magic2" and "key_magic5", etc.
+ */
+ if ((kbd_magic_keys = getenv ("magic_keys")) == NULL)
+ kbd_magic_keys = "";
+
+ /* loop over all magic keys;
+ * use '\0' suffix in case of empty string
+ */
+ for (suffix = kbd_magic_keys; *suffix ||
+ suffix == kbd_magic_keys; ++suffix) {
+ sprintf (magic, "%s%c", kbd_magic_prefix, *suffix);
+
+ if (compare_magic(kbd_data, getenv(magic)) == 0) {
+ uchar cmd_name[sizeof (kbd_command_prefix) + 1];
+ char *cmd;
+
+ sprintf (cmd_name, "%s%c", kbd_command_prefix, *suffix);
+ cmd = getenv (cmd_name);
+
+ return (cmd);
+ }
+ }
+
+ return (NULL);
+}
+
+#endif /* CONFIG_PREBOOT */
+
int misc_init_f (void)
{
+}
+
+int misc_init_r (void)
+{
+#ifdef CONFIG_PREBOOT
+ struct kbd_data_t kbd_data;
+ /* Decode keys */
+ uchar *str = strdup (key_match (get_keys (&kbd_data)));
+ /* Set or delete definition */
+ setenv ("preboot", str);
+ free (str);
+#endif /* CONFIG_PREBOOT */
+
return 0;
}