[haiku-development] Re: S3 Video Driver
- From: Jan Kloetzke <jan.kloetzke@xxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Wed, 28 May 2008 08:30:30 +0200
Gerald Zajac <zajacg@xxxxxxxxxxxxx> wrote:
> I haven't looked at that code yet, but I hope that it will also allow
> drivers other than the VESA driver to call the video BIOS.
Indeed it's already possible. You just have to do something like that:
#include <arch/x86/vm86.h>
{
struct vm86_state vmState;
status_t ret = vm86_prepare(&vmState, 0x2000);
if (ret != B_OK)
return ret;
vmState.regs.eax = 0x4f02;
vmState.regs.ebx = 0x123;
ret = vm86_do_int(vmState, 0x10);
if (ret != B_OK) {
/* vm86 mode failed */
}
if ((vmState.regs.eax & 0xffff) != 0x4f) {
/* handle VESA error */
}
vm86_cleanup(&vmState);
}
You can also have a look at my recently posted patches for the VESA driver.
Please note that you will need the "[PATCH 1/4] Export vm86_* functions to
other modules correctly" patch, otherwise your driver won't compile nor
link...
/Jan
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