[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1 of 5] rombios/keyboard: Don't needlessly poll the status register
Repeated polling of the status register is not going to change its value, so don't needlessly take 8192 traps to Qemu when 1 will do. Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> diff -r 0049de3827bc -r 1728fb789940 tools/firmware/rombios/rombios.c --- a/tools/firmware/rombios/rombios.c +++ b/tools/firmware/rombios/rombios.c @@ -1805,12 +1805,12 @@ keyboard_init() while ( (inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x00); /* flush incoming keys */ - max=0x2000; + max=2; while (--max > 0) { outb(0x80, 0x00); if (inb(0x64) & 0x01) { inb(0x60); - max = 0x2000; + max = 2; } } _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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