[SeaBIOS] [PATCH] Use dedicated HVM debug io port for Xen
Julian Pidancet
julian.pidancet at gmail.com
Wed Jan 4 18:19:59 CET 2012
On Sat, Nov 5, 2011 at 2:43 AM, Julian Pidancet
<julian.pidancet at gmail.com> wrote:
> When running on Xen, use Xen debug io port as debug output instead
> of Bochs one.
>
> Signed-off-by: Julian Pidancet <julian.pidancet at gmail.com>
> ---
> src/output.c | 9 +++++++--
> src/xen.h | 2 ++
> 2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/src/output.c b/src/output.c
> index 462ffb7..78541a4 100644
> --- a/src/output.c
> +++ b/src/output.c
> @@ -11,6 +11,7 @@
> #include "bregs.h" // struct bregs
> #include "config.h" // CONFIG_*
> #include "biosvar.h" // GET_GLOBAL
> +#include "xen.h" // PORT_XEN_DEBUG
>
> struct putcinfo {
> void (*func)(struct putcinfo *info, char c);
> @@ -75,9 +76,13 @@ putc_debug(struct putcinfo *action, char c)
> {
> if (! CONFIG_DEBUG_LEVEL)
> return;
> - if (! CONFIG_COREBOOT)
> + if (! CONFIG_COREBOOT) {
> // Send character to debug port.
> - outb(c, PORT_BIOS_DEBUG);
> + if (CONFIG_XEN)
> + outb(c, PORT_XEN_DEBUG);
> + else
> + outb(c, PORT_BIOS_DEBUG);
> + }
> if (c == '\n')
> debug_serial('\r');
> debug_serial(c);
> diff --git a/src/xen.h b/src/xen.h
> index 0ed1e9f..802fee0 100644
> --- a/src/xen.h
> +++ b/src/xen.h
> @@ -3,6 +3,8 @@
>
> #include "util.h"
>
> +#define PORT_XEN_DEBUG 0xe9
> +
> extern u32 xen_cpuid_base;
>
> void xen_probe(void);
> --
> Julian Pidancet
>
I posted this simple patch a while ago. Anybody got the time to take a look ?
--
Julian
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