[SeaBIOS] [PATCH 3/6] paravirt: read QEMU_CFG_NOGRAPHIC, store in etc/sercon-enable romfile
Kevin O'Connor
kevin at koconnor.net
Fri Sep 8 20:32:08 CEST 2017
On Fri, Sep 08, 2017 at 08:18:25AM +0200, Gerd Hoffmann wrote:
> Will be used as runtime switch to enable serial console support.
>
> Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
> ---
> src/fw/paravirt.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c
> index 5b23d786be..e9cca4fe6e 100644
> --- a/src/fw/paravirt.c
> +++ b/src/fw/paravirt.c
> @@ -210,6 +210,7 @@ qemu_platform_setup(void)
> #define QEMU_CFG_SIGNATURE 0x00
> #define QEMU_CFG_ID 0x01
> #define QEMU_CFG_UUID 0x02
> +#define QEMU_CFG_NOGRAPHIC 0x04
> #define QEMU_CFG_NUMA 0x0d
> #define QEMU_CFG_BOOT_MENU 0x0e
> #define QEMU_CFG_NB_CPUS 0x05
> @@ -510,6 +511,7 @@ qemu_cfg_legacy(void)
> qemu_romfile_add("etc/show-boot-menu", QEMU_CFG_BOOT_MENU, 0, 2);
> qemu_romfile_add("etc/irq0-override", QEMU_CFG_IRQ0_OVERRIDE, 0, 1);
> qemu_romfile_add("etc/max-cpus", QEMU_CFG_MAX_CPUS, 0, 2);
> + qemu_romfile_add("etc/sercon-enable", QEMU_CFG_NOGRAPHIC, 0, 2);
Instead of looking at QEMU_CFG_NOGRAPHIC, I think the C code could
check if GET_IVT(0x10).segoff == FUNC16(entry_10).segoff . This has
the advantage of working whenever a vgarom is not installed (including
on coreboot).
-Kevin
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