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hw/char/pl011: Warn when using disabled receiver

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We shouldn't receive characters when the full UART or its
receiver is disabled. However we don't want to break the
possibly incomplete "my first bare metal assembly program"s,
so we choose to simply display a warning when this occurs.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Luc Michel <luc.michel@amd.com>
Message-Id: <20250220092903.3726-2-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2023-05-22 11:05:49 +02:00
parent 92988c4501
commit abf2b6a028
1 changed files with 9 additions and 0 deletions
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9
hw/char/pl011.c
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@ -85,6 +85,7 @@ DeviceState *pl011_create(hwaddr addr, qemu_irq irq, Chardev *chr)
#define CR_OUT1 (1 << 12)
#define CR_RTS (1 << 11)
#define CR_DTR (1 << 10)
#define CR_RXE (1 << 9)
#define CR_TXE (1 << 8)
#define CR_LBE (1 << 7)
#define CR_UARTEN (1 << 0)
@ -487,6 +488,14 @@ static int pl011_can_receive(void *opaque)
PL011State *s = (PL011State *)opaque;
int r;
if (!(s->cr & CR_UARTEN)) {
qemu_log_mask(LOG_GUEST_ERROR,
"PL011 receiving data on disabled UART\n");
}
if (!(s->cr & CR_RXE)) {
qemu_log_mask(LOG_GUEST_ERROR,
"PL011 receiving data on disabled RX UART\n");
}
r = s->read_count < pl011_get_fifo_depth(s);
trace_pl011_can_receive(s->lcr, s->read_count, r);
return r;