[gPXE-devel] [PATCH v3][lkrn] add ramdisk support

[Stefan Hajnoczi]

On Thu, Jun 3, 2010 at 4:06 AM, Wu Fengguang <fengguang.wu at intel.com> wrote:
> --- gpxe.orig/src/arch/i386/prefix/libprefix.S  2010-06-03 10:38:34.000000000 +0800
> +++ gpxe/src/arch/i386/prefix/libprefix.S       2010-06-03 10:40:58.000000000 +0800
> @@ -704,6 +704,11 @@ install_prealloc:
>        /* Set up %ds for access to .data16 */
>        movw    %bx, %ds
>
> +       movl    %es:ramdisk_image, %ecx
> +       movl    %ecx, lkrn_ramdisk
> +       movl    %es:ramdisk_size, %ecx
> +       movl    %ecx, lkrn_ramdisk_size
> +
>  #ifdef KEEP_IT_REAL
>        /* Initialise libkir */
>        movw    %ax, (init_libkir_vector+2)
>

I would put this in lkrnprefix.S instead.  If you look at pxeprefix.S
there is code to copy an undi device structure for .prefix.data to the
.data16 section:

        /* Copy our undi_device structure to the preloaded_undi variable */
        movw    %bx, %es
        movw    $preloaded_undi, %di
        movw    $undi_device, %si
        movw    $undi_device_size, %cx
        rep movsb

This is done after install has returned to pxeprefix.S.

Stefan