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| author | Taru Karttunen <taruti@taruti.net> | 2011-03-30 15:46:40 +0300 |
|---|---|---|
| committer | Taru Karttunen <taruti@taruti.net> | 2011-03-30 15:46:40 +0300 |
| commit | e5888a1ffdae813d7575f5fb02275c6bb07e5199 (patch) | |
| tree | d8d51eac403f07814b9e936eed0c9a79195e2450 /sys/src/ape/lib/ap/power/cycles.s | |
Import sources from 2011-03-30 iso image
Diffstat (limited to 'sys/src/ape/lib/ap/power/cycles.s')
| -rwxr-xr-x | sys/src/ape/lib/ap/power/cycles.s | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/sys/src/ape/lib/ap/power/cycles.s b/sys/src/ape/lib/ap/power/cycles.s new file mode 100755 index 000000000..b4ad52367 --- /dev/null +++ b/sys/src/ape/lib/ap/power/cycles.s @@ -0,0 +1,17 @@ +#define TBRL 268 +#define TBRU 269 /* Time base Upper/Lower (Reading) */ + +/* + * time stamp counter; _cycles since power up + * Runs at fasthz/4 cycles per second (m->clkin>>3) + */ +TEXT _cycles(SB),1,$0 +loop: + MOVW SPR(TBRU),R7 + MOVW SPR(TBRL),R8 + MOVW SPR(TBRU),R5 + CMP R5,R7 + BNE loop + MOVW R7,0(R3) + MOVW R8,4(R3) + RETURN |