From df8d94e067f7f080eb4dc5af33755218e23d506a Mon Sep 17 00:00:00 2001 From: "Gabriel L. Somlo" Date: Fri, 19 Feb 2016 13:20:25 -0500 Subject: fw_cfg: expose control register size in fw_cfg.h MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Gabriel Somlo Reviewed-by: Laszlo Ersek Reviewed-by: Marc Marí Message-id: 1455906029-25565-2-git-send-email-somlo@cmu.edu Signed-off-by: Gerd Hoffmann --- include/hw/nvram/fw_cfg.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include') diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h index 5d19975..4315f4e 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 -- cgit v1.1