discover: Make boot_priorities more flexible

Rather than rely on the ordering of the boot_priorities array to define
which device types have a higher "default boot" priority, this change
introduces a slightly more flexible way of priority lookups, by adding a
separate priority field to struct boot_priority.

This means we can have an unordered array, change priorities without
re-writing the array, and implementing a disable mechanism.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/types/types.h b/lib/types/types.h
index 3a76cda..a1065ee 100644
--- a/lib/types/types.h
+++ b/lib/types/types.h
@@ -109,6 +109,11 @@ struct network_config {
 };
 
 struct boot_priority {
+	/* Boot options with higher priority values will take precedence over
+	 * lower values. Negative priorities signify "don't boot this by
+	 * default".
+	 */
+	int			priority;
 	enum device_type	type;
 };