From abf2b6a028670bd2890bb3aee7e103fe53e4b0df Mon Sep 17 00:00:00 2001 From: =?utf8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Mon, 22 May 2023 11:05:49 +0200 Subject: [PATCH] hw/char/pl011: Warn when using disabled receiver MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Luc Michel Message-Id: <20250220092903.3726-2-philmd@linaro.org> --- hw/char/pl011.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/hw/char/pl011.c b/hw/char/pl011.c index 06ce851044..12a2d4bc7b 100644 --- a/hw/char/pl011.c +++ b/hw/char/pl011.c @@ -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; -- 2.30.2