SMBus BIOS

kpshare

请问现在的BIOS是不是都不支持SMBus　BIOS了？我按照"System Management Bus BIOS Interface Specification"，在dos下check三台电脑都BIOS都发现不支持，是不是早就取消这项功能了？
$ z3 ?; K! R. i( O  ^/ {
smbus bios.pdf (133.96 KB, 下载次数: 919)

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4.1.1 SMBus Installation Check (01H)
( }# A% p2 k# h3 O8 L4 vThis call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
: |9 M& G! f, B. nInterface and if so, which version of the specification it supports.  The values passed in BL and
CX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
7 f+ {; E4 s# R+ }present, will result in an SMBus invalid signature error.
The version number returned by this call is the highest level of SMBus BIOS Interface
( P2 n$ ]! N9 I& m& a, c2 C% p% cspecification supported by the SMBus BIOS.
The vendor-specified hardware code may be optionally used to identify the SMBus host
0 ?) r8 k% ?2 ?/ Qhardware.  If this feature is not used, it must return zero.  This return code may be used by
( w3 P! F6 h1 [0 ooperating systems that do not want to use the BIOS services, but rather want to identify and
- j% @; G6 o: }8 Q3 z: {communicate directly with the hardware.
  c1 v7 }2 [( QCall With
+ K. V3 _% C* p$ k3 l
# P/ o; q7 ^. ?8 c/ x$ {AX = 53B0H SMBus Access
$ o+ L8 \; ~; q0 b; R, ZBH = 01H SMBus Installation Check
. r8 u+ e/ a  s- Q& }BL = 72H
CH = 61H
CL = 64H
Returns
If function successful:
Carry = 0 SMBus is supported by BIOS
AH = 01H SMBus BIOS Interface Specification major
2 ]) l- j( O2 p: s& g6 Bversion number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
+ c/ h$ H0 e' a* j, }version number (in BCD format)
$ y( T5 W; E. y7 M3 ]% A* WBL = Number of SMBus Devices Present
, t. G% x( B* s0 B) L9 x* A* _CH = ASCII "i" character (69H)
CL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
If function unsuccessful:
Carry = 1
! d7 j* x3 ?' K4 a: N: l2 b3 rAH = Error code
6 H- _& i, f! S+ s' O2 \. ~- r0AH  SMBus invalid signature
86H  SMBus not supported

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