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[romprefix] Allow ROM banner timeout to be configured independently

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iPXE currently prints a "Press Ctrl-B" banner twice: once when the ROM
is first called for initialisation and again if we attempt to boot
from the ROM.  This slows boot, especially when the NIC is not the
primary boot device.  Tools such as libguestfs make use of QEMU VMs
for performing maintenance on disk images and may make use of NICs in
the VM for network support.  If iPXE introduces a static init-time
delay, that directly translates to increased runtime for the tools.

Fix by allowing the ROM banner timeout to be configured independently
of the main banner timeout.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Alex Williamson
2014-02-25 16:33:08 -07:00
committed by Michael Brown
parent f22c19f3fb
commit 27d1b40ee9
2 changed files with 17 additions and 10 deletions
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10
src/arch/i386/prefix/romprefix.S
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@@ -25,12 +25,8 @@ FILE_LICENCE ( GPL2_OR_LATER )
( PMM_HANDLE_BASE | 0x00002000 )
#define PCI_FUNC_MASK 0x07
/* ROM banner timeout. Based on the configurable BANNER_TIMEOUT in
* config.h, but converted to a number of (18Hz) timer ticks, and
* doubled to allow for BIOSes that switch video modes immediately
* beforehand, so rendering the message almost invisible to the user.
*/
#define ROM_BANNER_TIMEOUT ( 2 * ( 18 * BANNER_TIMEOUT ) / 10 )
/* ROM banner timeout, converted to a number of (18Hz) timer ticks. */
#define ROM_BANNER_TIMEOUT_TICKS ( ( 18 * ROM_BANNER_TIMEOUT ) / 10 )
/* Allow payload to be excluded from ROM size
*/
@@ -791,7 +787,7 @@ wait_for_key:
int $0x16
jmp 1b
2: /* Wait for a key press */
movw $ROM_BANNER_TIMEOUT, %cx
movw $ROM_BANNER_TIMEOUT_TICKS, %cx
3: decw %cx
js 99f /* Exit with ZF clear */
/* Wait for timer tick to be updated */