[Xen-ia64-devel] RE: [Xen-ia64][GFW PATCH]VGA high color fix

["Zhang, Xing Z" <xing.z.zhang@xxxxxxxxx>]

>-----Original Message-----
>From: tgingold@xxxxxxx [mailto:tgingold@xxxxxxx]
>Sent: 2007?12?11? 23:21
>To: Zhang, Xing Z
>Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx; tgingold@xxxxxxx
>Subject: Re: [Xen-ia64][GFW PATCH]VGA high color fix
>
>Quoting "Zhang, Xing Z" <xing.z.zhang@xxxxxxxxx>:
>
>> This patch fixes low VGA show in windows guest.
>
>Congrat!
>
>> The root cause is win2k3 will check VGA bios during
>HalInitSystem(). Open GFW
>> has no VGA bios support.
>
>I see.  I suppose win2k3 has an x86 emulator (or ia32-el).

Yes. Seems windows executes these code by a x86 emulator.

>
>> This patch is for that.
>
>I suppose the cirrus bios is the cirrus-bios image ?
>
>Do you know how it is loaded on x86/ia32 ?

It should be load in tools/ioemu/hw/pc.c. Here is a piece of code:

    /* VGA BIOS load */
    if (cirrus_vga_enabled) {
        snprintf(buf, sizeof(buf), "%s/%s", bios_dir, VGABIOS_CIRRUS_FILENAME);
    } else {
        snprintf(buf, sizeof(buf), "%s/%s", bios_dir, VGABIOS_FILENAME);
    }   
    ret = load_image(buf, phys_ram_base + vga_bios_offset);
>
>>
>> Hi Tristan:
>>      I'd like to invoke CopyMem() which includes in BaseMemoryLib
>in VgaInit.c. I
>> add BaseMemoryLib declaration in VgaInit.msa but it still
>complains
>> "undefined reference to CopyMem" during link time. What I lost?
>I directly
>> copy InternalMemCopyMem() to VgaInit.c as a workaround but
>it need be
>> replaced by CopyMem() when it is checked in. Could you offer
>me some help on
>> this compiling issue?
>
>I don't know how to do this by heart, but I will take care of
>this.
>
>Tristan.

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