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| author | Nadav Amit <namit@vmware.com> | 2020-07-01 12:30:45 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-02 05:41:57 -0400 |
| commit | c83858a4e0b3b6d9554c866cb5163a27fa5964bf (patch) | |
| tree | 58de92ac70af1876eb96fd73b8a752d8609d1e71 | |
| parent | eae10e8f3d7fbb539af8dcfdab4df2a4f70fab05 (diff) | |
| download | kvm-unit-tests-c83858a4e0b3b6d9554c866cb5163a27fa5964bf.tar.gz | |
x86: realmode: fix serial_init()
In some setups serial output from the real-mode tests is corrupted.
I do not know the serial port initialization code well, but the
protected mode initialization code is different than the real-mode code.
Using the protected mode serial port initialization fixes the problem.
Keeping the tradition of code duplication between real-mode and
protected mode, this patch copies the missing initialization into
real-mode serial port initialization.
Signed-off-by: Nadav Amit <namit@vmware.com>
Message-Id: <20200701193045.31247-1-namit@vmware.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | x86/realmode.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/x86/realmode.c b/x86/realmode.c index 90ecd13..7c2d776 100644 --- a/x86/realmode.c +++ b/x86/realmode.c @@ -77,6 +77,15 @@ static void serial_init(void) lcr = inb(serial_iobase + 0x03); lcr &= ~0x80; outb(lcr, serial_iobase + 0x03); + + /* IER: disable interrupts */ + outb(0x00, serial_iobase + 0x01); + /* LCR: 8 bits, no parity, one stop bit */ + outb(0x03, serial_iobase + 0x03); + /* FCR: disable FIFO queues */ + outb(0x00, serial_iobase + 0x02); + /* MCR: RTS, DTR on */ + outb(0x03, serial_iobase + 0x04); } #endif |