From 25fc0e6b2778fecfc631a7a523351202a3a10295 Mon Sep 17 00:00:00 2001 From: Keir Fraser Date: Tue, 9 Dec 2008 12:41:12 +0000 Subject: [PATCH] rombios: support BCV Signed-off-by: Akio Takebe Signed-off-by: Kouya Shimura --- tools/firmware/rombios/rombios.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/tools/firmware/rombios/rombios.c b/tools/firmware/rombios/rombios.c index 05ee9875c6..c2ca5c51b8 100644 --- a/tools/firmware/rombios/rombios.c +++ b/tools/firmware/rombios/rombios.c @@ -9725,6 +9725,30 @@ fetch_bdf: mov ax, 2[bx] cmp ax, #0x506e jne no_bev + + mov ax, 0x16[bx] ;; 0x16 is the offset of Boot Connection Vector + cmp ax, #0x0000 + je no_bcv + + ;; Option ROM has BCV. Run it now. + push cx ;; Push seg + push ax ;; Push offset + + ;; Point ES:DI at "$PnP", which tells the ROM that we are a PnP BIOS. + mov bx, #0xf000 + mov es, bx + lea di, pnp_string + /* jump to BCV function entry pointer */ + mov bp, sp ;; Call ROM BCV routine using seg:off on stack + db 0xff ;; call_far ss:[bp+0] + db 0x5e + db 0 + cli ;; In case expansion ROM BIOS turns IF on + add sp, #2 ;; Pop offset value + pop cx ;; Pop seg value (restore CX) + ja no_bev + +no_bcv: mov ax, 0x1a[bx] ;; 0x1A is also the offset into the expansion header of... cmp ax, #0x0000 ;; the Bootstrap Entry Vector, or zero if there is none. je no_bev -- 2.30.2