Re: [coreboot] How to trigger SMI and implement SMM

[Stefan Reinauer]

* Yu-Cheng Liu <peter90609(a)gmail.com> [150721 11:04]:
  Hello,
 
 I purpose to trigger SMI event and do something in SMM mode .
 
  
 
 I trace the coreboot source code and found that, during the coreboot
 environment setup, the file locate at southbridge/intel/i82801ix/smi.c  will be
 excute. Is it enough for SMI/SMM operation?
That is just the code that installs the SMM handler (well, part of it)

  I didn’t see the code under cpu/smm be locate in the
ramstage.debug symbol.
The SMM handler is a separate module.

  What is the different purpose between
southbridge/intel/i82801ix/smi.c and /cpu
 /x86/smm?
The code in southbridge/intel/i82801ix/smi.c is the chipset specific SMI
initialization. southbridge/intel/i82801ix/smihandler.c is the chipset
specific SMI handler.

The code under cpu/x86/smm is generic for the x86 architecture.

  How do I trigger the SMI event?
Typically hardware triggers an SMI, e.g. on a GPE event, timeout, or
such. See southbridge/intel/i82801ix/smihandler.c for a more
comprehensive list of southbridge SMI sources.

You can also use the APMC SMI command mechanism to manually trigger
SMIs, see southbridge_smi_apmc(void) for details.

Stefan