Re: [Qemu-devel] Fix for bochs vbe issues

[Fabrice Bellard <fabrice@bellard.org>]

Hi,

I just commited a slightly different patch. Tell me if it works.

Fabrice

Matthew Mastracci wrote:
> I found a way to fix the bochs VBE issues in Windows 2000.  It looks 
> really good in 16+ bit color.  The changes in this patch are:
> 
> - Use linear (chain-4) mode for all VBE_DISPI_ENABLED modes
> - Add ff80 and ff81 as valid ioport registers (these are the old ports, 
> still used by the driver)
> 
> Some of the issues with the patch:
> 
> - There are black lines that appear on the screen at what appear to be 
> lines that span a display bank.  This only seems to happen in 8- or 
> 24-bit.  Puzzling!
> - The shutdown screen in windows 2000 is corrupted.
> 
> A better patch might tweak some of the sequence controller and bank 
> select registers to set the chain-4 mode, but I haven't tried that yet.
> 
> diff -u -r ./hw/vga.c ../../qemu-0.5.4/hw/vga.c
> --- ./hw/vga.c  2004-04-26 15:17:28.000000000 -0600
> +++ ../../qemu-0.5.4/hw/vga.c   2004-04-27 21:46:20.828796000 -0600
> @@ -678,7 +678,10 @@
>         break;
>     }
> 
> -    if (s->sr[4] & 0x08) {
> +       if (s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED) {
> +        /* VBE mode : simplest access */
> +        ret = s->vram_ptr[addr];
> +       } else if (s->sr[4] & 0x08) {
>         /* chain 4 mode : simplest access */
>         ret = s->vram_ptr[addr];
>     } else if (s->gr[5] & 0x10) {
> @@ -756,7 +759,17 @@
>         break;
>     }
> 
> -    if (s->sr[4] & 0x08) {
> +       if (s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED) {
> +        /* VBE mode : simplest access */
> +        plane = (s->gr[4] & 2) | (addr & 1);
> +        if (s->sr[2] & (1 << plane)) {
> +            s->vram_ptr[addr] = val;
> +#ifdef DEBUG_VGA_MEM
> +            printf("vga: VBE: [0x%x]\n", addr);
> +#endif
> +            cpu_physical_memory_set_dirty(s->vram_offset + addr);
> +        }
> +       } else if (s->sr[4] & 0x08) {
>         /* chain 4 mode : simplest access */
>         plane = addr & 3;
>         if (s->sr[2] & (1 << plane)) {
> @@ -1768,6 +1781,11 @@
> 
>     register_ioport_write(0x1ce, 1, 2, vbe_ioport_write, s);
>     register_ioport_write(0x1cf, 1, 2, vbe_ioport_write, s);
> +    register_ioport_read(0xff80, 1, 2, vbe_ioport_read, s);
> +    register_ioport_read(0xff81, 1, 2, vbe_ioport_read, s);
> +
> +    register_ioport_write(0xff80, 1, 2, vbe_ioport_write, s);
> +    register_ioport_write(0xff81, 1, 2, vbe_ioport_write, s);
> #endif
> 
>     vga_io_memory = cpu_register_io_memory(0, vga_mem_read, vga_mem_write);
> 
> 
> ------------------------------------------------------------------------
> 
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