[SeaBIOS] [RFC] [PATCH 1/2] Implement support for transitioning from 16 bit to 32 bit

[Kevin O'Connor]

On Mon, Nov 22, 2010 at 12:08:33PM -0500, Stefan Berger wrote:
> The attached patch implements support for the transparent call of
> functions in 32 bit space from 16 bit code and allows up to 6
[...]
> +        // Disable irqs (and clear direction flag)
> +        cli
> +        cld
> +
> +        // Disable nmi
> +        movl $CMOS_RESET_CODE|NMI_DISABLE_BIT, %eax
> +        outb %al, $PORT_CMOS_INDEX
> +        inb $PORT_CMOS_DATA, %al
> +
> +        // enable a20
> +        inb $PORT_A20, %al
> +        orb $A20_ENABLE_BIT, %al
> +        outb %al, $PORT_A20

It should be possible to extend call32() to do what you need -
duplicating this functionality is a non-starter.

-Kevin