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| author | Keir Fraser <keir.fraser@citrix.com> | 2008-12-09 12:41:12 +0000 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2008-12-09 12:41:12 +0000 |
| commit | 25fc0e6b2778fecfc631a7a523351202a3a10295 (patch) | |
| tree | cc9200ebdd4b8398615ddaa228179cd2da3edc1e /tools | |
| parent | a046a6dc893165068ee4e6692b152da828dc1970 (diff) | |
| download | xen-25fc0e6b2778fecfc631a7a523351202a3a10295.tar.gz xen-25fc0e6b2778fecfc631a7a523351202a3a10295.tar.bz2 xen-25fc0e6b2778fecfc631a7a523351202a3a10295.zip | |
rombios: support BCV
Signed-off-by: Akio Takebe <takebe_akio@jp.fujitsu.com>
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/firmware/rombios/rombios.c | 24 |
1 files changed, 24 insertions, 0 deletions
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 |