# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1228826472 0
# Node ID 76099ad24cbde2d12dc74aa4edc0adefaa9f1767
# Parent cc82d54bedfd20442a1604907ed65c5166397c43
rombios: support BCV
Signed-off-by: Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>
Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
---
tools/firmware/rombios/rombios.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+)
diff -r cc82d54bedfd -r 76099ad24cbd tools/firmware/rombios/rombios.c
--- a/tools/firmware/rombios/rombios.c Fri Dec 05 15:54:22 2008 +0000
+++ b/tools/firmware/rombios/rombios.c Tue Dec 09 12:41:12 2008 +0000
@@ -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
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