diff options
Diffstat (limited to 'src/soc/intel/broadwell/bootblock/timestamp.inc')
| -rw-r--r-- | src/soc/intel/broadwell/bootblock/timestamp.inc | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/soc/intel/broadwell/bootblock/timestamp.inc b/src/soc/intel/broadwell/bootblock/timestamp.inc new file mode 100644 index 0000000000..f565775ed8 --- /dev/null +++ b/src/soc/intel/broadwell/bootblock/timestamp.inc @@ -0,0 +1,19 @@ +/* Store the initial timestamp for booting in mmx registers. This works + * because the bootblock isn't being compiled with MMX support so mm0 and + * mm1 will be preserved into romstage. */ + .code32 + +.global stash_timestamp +stash_timestamp: + + /* Save the BIST value */ + movl %eax, %ebp + + finit + rdtsc + movd %eax, %mm0 + movd %edx, %mm1 + + /* Restore the BIST value to %eax */ + movl %ebp, %eax + |