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author | Sebastian Schmelzer | 2010-10-25 16:53:54 +0200 |
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committer | Sebastian Schmelzer | 2010-10-25 16:53:54 +0200 |
commit | 3050a9253437f4a4b5ad4bf3b3efdc3c660a5137 (patch) | |
tree | 91ac22153e416aac7ca20916b314b5e2ffa871b1 /contrib/syslinux-4.02/com32/menu/drain.c | |
download | preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.tar.gz preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.tar.xz preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.zip |
Diffstat (limited to 'contrib/syslinux-4.02/com32/menu/drain.c')
-rw-r--r-- | contrib/syslinux-4.02/com32/menu/drain.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/menu/drain.c b/contrib/syslinux-4.02/com32/menu/drain.c new file mode 100644 index 0000000..60efd35 --- /dev/null +++ b/contrib/syslinux-4.02/com32/menu/drain.c @@ -0,0 +1,25 @@ +#include <stdio.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <sys/cpu.h> + +void drain_keyboard(void) +{ + /* Prevent "ghost typing" and keyboard buffer snooping */ + volatile char junk; + int rv; + + do { + rv = read(0, (char *)&junk, 1); + } while (rv > 0); + + junk = 0; + + cli(); + *(volatile uint8_t *)0x419 = 0; /* Alt-XXX keyboard area */ + *(volatile uint16_t *)0x41a = 0x1e; /* Keyboard buffer empty */ + *(volatile uint16_t *)0x41c = 0x1e; + memset((void *)0x41e, 0, 32); /* Clear the actual keyboard buffer */ + sti(); +} |