[Xen-devel] Re: [Bochs-developers] [Patch] [BIOS] support BCV for rombios

[Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>]

Hi,

>> +   /* 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
>
>ja? not jmp?
>
Oops. yes jmp.

>> + 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
>

Best Regards,

Akio Takebe


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