libpayload/libc/console: Flush input driver buffer on init
When console input driver registers itself, perform flush of input buffer to avoid interpreting any stale key presses before libpayload is run. keyboard.c: Remove the redundant buffer flush. 8250.c: Ensure that serial_hardware_is_present is set before call to add input driver. BUG=b:37273808 TEST=Verified that any key presses in serial console before payload is up do not have any effect after the payload starts running. Change-Id: I46f1b6715ccf6418f5b2c741bf90db2ece26a60d Signed-off-by: Furquan Shaikh <furquan@chromium.org> Reviewed-on: https://review.coreboot.org/19345 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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@ -310,9 +310,6 @@ void keyboard_init(void)
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if (inb(0x64) == 0xFF)
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return;
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/* Empty keyboard buffer */
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while (keyboard_havechar()) keyboard_getchar();
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console_add_input_driver(&cons);
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}
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@ -137,10 +137,10 @@ void serial_console_init(void)
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return;
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serial_init();
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serial_hardware_is_present = 1;
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console_add_input_driver(&consin);
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console_add_output_driver(&consout);
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serial_hardware_is_present = 1;
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}
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void serial_putchar(unsigned int c)
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@ -76,6 +76,9 @@ void console_add_input_driver(struct console_input_driver *in)
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/* Check if this driver was already added to the console list */
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if (input_driver_exists(in))
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return;
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/* Flush out the driver input buffer. */
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while (in->havekey())
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in->getchar();
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in->next = console_in;
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console_in = in;
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}
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