lib/regscript: Add exclusive-or (xor) support

Hardware / Coreboot - Lee Leahy [intel.com] - 30 April 2016 08:40 UTC

Add xor support which enables toggling of a bit:
- REG_SCRIPT_COMMAND_RXW enum value
- REG_*_RXW* macros to support using REG_SCRIPT_COMMAND_RXW
- REG_*_XOR* macros to support using REG_SCRIPT_COMMAND_RXW
- reg_script_rxw routine to perform and/xor operation
- case in reg_script_run_step to call reg_script_rxw

TEST=Build and run on Galileo Gen2

Change-Id: I50a492c7c2643df5dc2d2fa7113e3722c1e480c7

6bcbe57 lib/regscript: Add exclusive-or (xor) support
src/include/reg_script.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++
src/lib/reg_script.c | 38 +++++++++++++++++++++++++++++++
2 files changed, 95 insertions(+)

Upstream: review.coreboot.org

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