[coreboot] Patch merged into coreboot/master: e5b0852 ELOG: Add support for SMM and kernel GSMI driver

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit e5b0852cb546d30252dbec1f323f2ce3292a6c89
Author: Duncan Laurie <dlaurie at chromium.org>
Date:   Sat Jun 23 16:48:38 2012 -0700

    ELOG: Add support for SMM and kernel GSMI driver
    
    The linux kernel contains an SMI driver that was written by
    me (Duncan) and upstreamed a couple years ago called GSMI.
    This driver will format a parameter buffer and pass pointers
    to this parameter buffer to the SMI handler.  It uses this to
    generate events for kernel shutdown reasons:  Clean, Panic, Oops,
    etc.
    
    This function expects to be passed pointers into the SMM state
    save area that correspond to the prameter buffer and the return
    code, which are typically EAX and EBX.
    
    The format of the parameter buffer is defined in the kernel
    driver so we implement the same interface here in order to be
    compatible.
    
    GSMI_CMD_HANDSHAKE: this is an early call that it does to try
    and detect what kind of BIOS is running.
    
    GSMI_CMD_SET_EVENT_LOG: this contains a parameter buffer that
    has event type and data.  The kernel-specific events are
    translated here and raw events are passed through as well which
    allows any run-time event to be added for testing.
    
    GSMI_CMD_CLEAR_EVENT_LOG: this command clears the event log.
    
    First the gsmi driver must be enabled in the kernel with
    CONFIG_GOOGLE_GSMI and then events can be added via sysfs
    and events are automatically generated for various kernel
    shutdown reasons.
    
    These can be seen in the event log as the 'Kernel Event' type:
    
    169 | 2012-06-23 15:03:04 | Kernl Event | Clean Shutdown
    181 | 2012-06-23 16:26:32 | Kernl Event | Oops
    181 | 2012-06-23 16:26:32 | Kernl Event | Panic
    
    Change-Id: Ic0a3916401f0d9811e4aa8b2c560657dccc920c1
    Signed-off-by: Duncan Laurie <dlaurie at chromium.org>

Build-Tested: build bot (Jenkins) at Tue Jul 24 17:22:50 2012, giving +1
Reviewed-By: Ronald G. Minnich <rminnich at gmail.com> at Thu Jul 26 00:19:39 2012, giving +2
See http://review.coreboot.org/1316 for details.

-gerrit