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？
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smbus bios.pdf (133.96 KB, 下载次数: 460)

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4.1.1 SMBus Installation Check (01H)
This call allows the SMBus caller to determine if a system's BIOS supports the SMBus BIOS
Interface 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
+ U8 Q3 |1 P' k. k+ [& Lpresent, will result in an SMBus invalid signature error.
The version number returned by this call is the highest level of SMBus BIOS Interface
5 ^) s- A7 t3 F( Y4 [specification supported by the SMBus BIOS.
4 e& ^% Z" F" \3 `( a% X! ]6 xThe vendor-specified hardware code may be optionally used to identify the SMBus host
" ]1 T- ^1 d$ k, C8 `hardware.  If this feature is not used, it must return zero.  This return code may be used by
operating systems that do not want to use the BIOS services, but rather want to identify and
communicate directly with the hardware.
% {- j0 @7 @% f% W. ~: ~Call With

AX = 53B0H SMBus Access
6 [5 C: R  \; U& x7 E( I4 \BH = 01H SMBus Installation Check
% ^$ _! O) r/ N& w2 n) xBL = 72H
CH = 61H
CL = 64H
& s0 G# ]' D% ?8 [- Y# M' uReturns
If function successful:
# y7 @" @& z' V& KCarry = 0 SMBus is supported by BIOS
% |) W8 {; P$ G9 `* E8 cAH = 01H SMBus BIOS Interface Specification major
version number (in BCD format)
AL = 00H SMBus BIOS Interface Specification minor
version number (in BCD format)
BL = Number of SMBus Devices Present
CH = ASCII "i" character (69H)
% i* t: B, \$ F  Q' l+ NCL = ASCII "A" character (41H)
2 ]' F& @- P; f' e0 vDX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
9 S$ c3 c/ U& b) S- K' CIf function unsuccessful:
Carry = 1
AH = Error code
# @# r* Y& l8 o( u& r0AH  SMBus invalid signature
) f6 l  ~5 t4 T# o86H  SMBus not supported

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