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: 235)

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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 b; `9 T* y5 q) ^2 uInterface 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
present, will result in an SMBus invalid signature error.
" d, D9 i. V$ K; v: {( ZThe version number returned by this call is the highest level of SMBus BIOS Interface
3 H8 v  Z! t/ D, mspecification supported by the SMBus BIOS.
" ]0 U  e' Q' Y# p( W* aThe 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
9 K: o2 f- ^( [operating systems that do not want to use the BIOS services, but rather want to identify and
communicate directly with the hardware.
Call With
* o- P# P5 k3 y1 L' N! t
0 @9 H. ]7 U9 p& V4 a* yAX = 53B0H SMBus Access
BH = 01H SMBus Installation Check
' e# C. Y# ?- q/ {, u8 UBL = 72H
& W9 {5 m7 [) |4 ]3 ]% DCH = 61H
8 |  {4 C; H( N- XCL = 64H
Returns
If function successful:
2 j( c/ f: b6 C% zCarry = 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)
& }( t7 F* i, pBL = Number of SMBus Devices Present
4 f3 N/ l" ^. v4 F' }CH = ASCII "i" character (69H)
4 y5 V  I, [1 |% XCL = ASCII "A" character (41H)
DX = Vendor Specified SMBus Hardware Code
0000H indicates undefined hardware
If function unsuccessful:
Carry = 1
AH = Error code
$ n  R. ]- _5 l  J$ |0AH  SMBus invalid signature
8 {0 Z. l5 A  i% G5 N2 `7 ?6 P86H  SMBus not supported

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