fw_cfg: add a public uapi header

Create a common header file for well-known values and structures to be
shared by the Linux kernel with qemu or other projects.

It is based from qemu/docs/specs/fw_cfg.txt which references
qemu/include/hw/nvram/fw_cfg_keys.h "for the most up-to-date and
authoritative list" & vmcoreinfo.txt. Those files don't have an
explicit license, but qemu/hw/nvram/fw_cfg.c is BSD-license, so
Michael S. Tsirkin suggested to use the same license.

The patch intentionally left out DMA & vmcoreinfo structures &
defines, which are added in the commits making usage of it.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 4623caf8d72d..fc2c373f24a0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11368,6 +11368,7 @@ M:	"Michael S. Tsirkin" <mst@redhat.com>
 L:      qemu-devel@nongnu.org
 S:      Maintained
 F:      drivers/firmware/qemu_fw_cfg.c
+F:      include/uapi/linux/qemu_fw_cfg.h
 
 QIB DRIVER
 M:      Dennis Dalessandro <dennis.dalessandro@intel.com>