[coreboot-gerrit] Change in coreboot[master]: timestamp: Add new helper functions

[Bora Guvendik (Code Review)]

Attention is currently required from: Furquan Shaikh, Selma Bensaid, Tim Wawrzynczak, Subrata Banik, Julius Werner, Angel Pons, Aaron Durbin.
Bora Guvendik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/51445 )

Change subject: timestamp: Add new helper functions
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Patch Set 8:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/51445/comment/d611ba79_ad2b3cac 
PS3, Line 7: Add helper fucntions
> > Hi Bora, […]

Thanks for feedback, I will explore Julius's idea

Here is the sample output with current implementation (first boot on a rvp board)

0:1st timestamp                                       0
 944:CSE sent 'Boot Stall Done' to PMC                 297,000
 945:CSE started to handle ICC configuration           304,000 (7,000)
 946:CSE sent 'Host BIOS Prep Done' to PMC             309,000 (5,000)
 947:CSE received 'CPU Reset Done Ack sent' from PMC   1,076,000 (767,000)
  11:start of bootblock                                1,103,646 (27,646)
  12:end of bootblock                                  1,164,113 (60,466)
...

//input in ms
CSME Timestamp[1]:1      //EC Boot Load Done (CSME ROM starts main execution) 
CSME Timestamp[6]:297    //CSME RBE set "Boot Stall Done" indication to PMC 
CSME Timestamp[7]:304    //CSME start poll for PMC PPS register
CSME Timestamp[10]:309   //CSME set "Host Boot Prep Done" indication to PMC 
CSME Timestamp[19]:1076  //PMC sent "Core Reset Done Ack – Sent" message to CSME