Int 15/AX=53B0h/BH=04h

Intel System Management Bus - 32-BIT PROTECTED-MODE CONNECT

AX = 53B0h
BH = 04h
CX = 6941h ('iA')

Return:
CF clear if successful
AX = SMBus 32-bit code segment (real mode base address)
EBX = offset of entry point into SMBus BIOS Interface
CX = SMBus 16-bit code segment (real mode base address)
DX = SMBus data segment (real mode base address)
SI = code segment length in bytes
DI = data segment length in bytes
CF set if error
AH = error code (01h,02h,0Ah,86h) (see #00484)
AL = sub-error code if error code is 02h (see #00485)

Desc: Connect to SMBus interface; once connected, all SMBus calls are made to the supplied entry point instead of INT 15 (with registers identical to those described here for INT 15)

Notes: Before calling the entry point, two descriptors must be initialized in the GDT or LDT. They must be consecutive and be in the order of 32-bit code, 16-bit code, then data. At the time of the call, the descriptors must be valid and have CPL=0.. The code descriptors must be ring-0 privilege. This function is supported only in INT 15 mode

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