[Xen-changelog] [xen-unstable] rombios: support BCV

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# 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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