Re: [Qemu-devel] [RFC PATCH 1/2] serial console, output

[Paolo Bonzini]

On 04/07/2016 17:26, Kevin O'Connor wrote:
> > 4k, we need both character and attribute.  But, yes, if we can allocate
> > that somewhere in real mode address space without running into memory
> > pressure this might be the best option.
> 
> Unfortunately, the screen can be larger than 80x25.

It can with SVGA BIOS, but Gerd here only supports mode 3, doesn't he?

Paolo

> If a large buffer is desired, it's also possible to malloc_high() it
> and then use either: call32() to access it, or int1587 to read/write
> it (see ramdisk.c:ramdisk_copy() as an example).  Either way it seems
> ugly.
> 
> At one point I looked through the sgabios code and was able to
> understand how it did caching.  I'll take another look and see if I
> can describe it.