From: Peng Fan <peng.fan@nxp.com>
To: u-boot@lists.denx.de
Subject: [PATCH 2/4] arch: arm/xen: add putc() for debugging
Date: Thu, 15 Oct 2020 06:52:32 +0000 [thread overview]
Message-ID: <DB6PR0402MB27602ABEF8CBE905DA237C1F88020@DB6PR0402MB2760.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20201015042516.41197-3-takahiro.akashi@linaro.org>
> Subject: [PATCH 2/4] arch: arm/xen: add putc() for debugging
>
> This new function, xen_debug_putc(), is intended to be used to enable
> CONFIG_DEBUG_UART on xen guest.
>
> Please note that the underlying functionality in Xen is available only when Xen
> is configured with !NDEBUG but is much simpler than a generic
> HYPERVISOR_console_io().
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> ---
> arch/arm/include/asm/xen/hypercall.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/arm/include/asm/xen/hypercall.h
> b/arch/arm/include/asm/xen/hypercall.h
> index a4fd077079a9..121ccfcc608f 100644
> --- a/arch/arm/include/asm/xen/hypercall.h
> +++ b/arch/arm/include/asm/xen/hypercall.h
> @@ -19,4 +19,10 @@ int HYPERVISOR_sched_op(int cmd, void *arg); int
> HYPERVISOR_event_channel_op(int cmd, void *arg); unsigned long
> HYPERVISOR_hvm_op(int op, void *arg); int
> HYPERVISOR_memory_op(unsigned int cmd, void *arg);
> +
> +static inline void xen_debug_putc(int c) {
> + register int v __asm__ ("x0") = c;
> + __asm__ __volatile__("hvc 0xfffe" : "=r" (v) : "0" (v)); }
> #endif /* _ASM_ARM_XEN_HYPERCALL_H */
Reviewed-by: Peng Fan <peng.fan@nxp.com>
> --
> 2.28.0
next prev parent reply other threads:[~2020-10-15 6:52 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-15 4:25 [PATCH 0/4] xen: improve console outputs AKASHI Takahiro
2020-10-15 4:25 ` [PATCH 1/4] serial: serial_xen: print U-Boot banner and others AKASHI Takahiro
2020-10-15 6:51 ` Peng Fan
2020-10-22 9:18 ` Anastasiia Lukianenko
2020-10-22 9:49 ` takahiro.akashi at linaro.org
2020-10-23 8:58 ` Anastasiia Lukianenko
2020-10-23 0:30 ` Tom Rini
2020-10-15 4:25 ` [PATCH 2/4] arch: arm/xen: add putc() for debugging AKASHI Takahiro
2020-10-15 6:52 ` Peng Fan [this message]
2020-10-23 0:31 ` Tom Rini
2020-10-15 4:25 ` [PATCH 3/4] xen: add definitions for console_io AKASHI Takahiro
2020-10-15 6:52 ` Peng Fan
2020-10-23 0:31 ` Tom Rini
2020-10-15 4:25 ` [PATCH 4/4] serial: serial_xen: add DEBUG_UART support AKASHI Takahiro
2020-10-15 6:50 ` Peng Fan
2020-10-22 9:19 ` Anastasiia Lukianenko
2020-10-22 9:53 ` takahiro.akashi at linaro.org
2020-10-23 8:50 ` Anastasiia Lukianenko
2020-10-26 5:58 ` takahiro.akashi at linaro.org
2020-10-26 6:18 ` Oleksandr Andrushchenko
2020-10-26 6:50 ` takahiro.akashi at linaro.org
2020-10-26 6:54 ` Oleksandr Andrushchenko
2020-10-26 7:10 ` takahiro.akashi at linaro.org
2020-10-26 7:30 ` Oleksandr Andrushchenko
2020-10-26 8:03 ` takahiro.akashi at linaro.org
2020-10-26 8:19 ` Oleksandr Andrushchenko
2020-10-26 7:16 ` Oleksandr Andrushchenko
2020-10-23 8:53 ` Anastasiia Lukianenko
2020-10-26 6:02 ` takahiro.akashi at linaro.org
2020-10-26 6:12 ` Oleksandr Andrushchenko
2020-10-23 0:31 ` Tom Rini
2020-10-23 9:22 ` Anastasiia Lukianenko
2020-10-23 12:34 ` Tom Rini
2020-10-23 13:06 ` Anastasiia Lukianenko
2020-10-23 13:18 ` Tom Rini
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