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: 226)

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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
1 |0 K3 h6 D  c& E- M' @/ SInterface and if so, which version of the specification it supports.  The values passed in BL and
/ f! _/ f0 D/ }' J! GCX are required to uniquely identify a legitimate caller to the SMBus BIOS Interface and, if not
: I. y  h+ d$ Jpresent, 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/ K# Q& ^0 Q! Bspecification supported by the SMBus BIOS.
4 v; |6 N6 e' Y4 xThe vendor-specified hardware code may be optionally used to identify the SMBus host
hardware.  If this feature is not used, it must return zero.  This return code may be used by
$ _" V* I/ o5 O% O: voperating systems that do not want to use the BIOS services, but rather want to identify and
4 m# @( k) O4 I0 M* Lcommunicate directly with the hardware.
Call With

& \$ M3 @  |* ^4 ~# \6 T0 rAX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
BL = 72H
9 u9 a' b* f' P) [. r/ p: O! tCH = 61H
CL = 64H
1 M8 w. {: d( F5 I& Y, l1 {Returns
& |# M5 X$ f& y% @If function successful:
Carry = 0 SMBus is supported by BIOS
AH = 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
$ j5 a0 ?+ D: O; N/ WCH = ASCII "i" character (69H)
CL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
If function unsuccessful:
; `! z" p$ C; h/ e9 e/ O" @Carry = 1
" r" `. ~- E: `6 I! U4 u, N4 i* Y/ t2 tAH = Error code
: E2 D; B+ J! N8 {9 ]* R0AH  SMBus invalid signature
86H  SMBus not supported

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