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vmm: Add new "null" serial/console output mode

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Poor performance was observed when booting kernels with "console=ttyS0"
and the serial port disabled.

This change introduces a "null" console output mode and makes it the
default for the serial console. In this case the serial port
is advertised as per other output modes but there is no input and any
output is dropped.

Fixes: #163

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2019-08-09 08:56:10 +01:00
committed by Sebastien Boeuf
parent f910476dd7
commit d9a355f85a
4 changed files with 135 additions and 10 deletions
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2
devices/src/legacy/serial.rs
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@@ -67,7 +67,7 @@ pub struct Serial {
}
impl Serial {
fn new(interrupt: Box<Interrupt>, out: Option<Box<io::Write + Send>>) -> Serial {
pub fn new(interrupt: Box<Interrupt>, out: Option<Box<io::Write + Send>>) -> Serial {
Serial {
interrupt_enable: 0,
interrupt_identification: DEFAULT_INTERRUPT_IDENTIFICATION,