[SeaBIOS] [PATCH] Use dedicated HVM debug io port for Xen

[Julian Pidancet]

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