diff options
| author | Gabriel L. Somlo <somlo@cmu.edu> | 2016-02-19 13:20:25 -0500 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2016-03-08 10:46:30 +0100 |
| commit | ce9a2aa372f567d1a19417ab02789706d132daf7 (patch) | |
| tree | b447b7e8da4524f816af2ca23d91c6b4466a36d1 /include | |
| parent | 97556fe80e4f7252300b3498b3477fb4295153a3 (diff) | |
fw_cfg: expose control register size in fw_cfg.h
Expose the size of the control register (FW_CFG_CTL_SIZE) in fw_cfg.h.
Add comment to fw_cfg_io_realize() pointing out that since the
8-bit data register is always subsumed by the 16-bit control
register in the port I/O case, we use the control register width
as the *total* width of the (classic, non-DMA) port I/O region reserved
for the device.
Cc: Marc Marí <markmb@redhat.com>
Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Marc Marí <markmb@redhat.com>
Message-id: 1455906029-25565-2-git-send-email-somlo@cmu.edu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/nvram/fw_cfg.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h index 5d19975df5..4315f4e582 100644 --- a/include/hw/nvram/fw_cfg.h +++ b/include/hw/nvram/fw_cfg.h @@ -44,6 +44,9 @@ #define FW_CFG_INVALID 0xffff +/* width in bytes of fw_cfg control register */ +#define FW_CFG_CTL_SIZE 0x02 + #define FW_CFG_MAX_FILE_PATH 56 #ifndef NO_QEMU_PROTOS |