diff options
| 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/libc/mips/tas.s | |
Import sources from 2011-03-30 iso image
Diffstat (limited to 'sys/src/libc/mips/tas.s')
| -rwxr-xr-x | sys/src/libc/mips/tas.s | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/sys/src/libc/mips/tas.s b/sys/src/libc/mips/tas.s new file mode 100755 index 000000000..d754b21f6 --- /dev/null +++ b/sys/src/libc/mips/tas.s @@ -0,0 +1,33 @@ +/* + * magnum user level lock code + */ + +#define LL(base, rt) WORD $((060<<26)|((base)<<21)|((rt)<<16)) +#define SC(base, rt) WORD $((070<<26)|((base)<<21)|((rt)<<16)) +#define NOOP WORD $0x27 +#define COP3 WORD $(023<<26) + + TEXT C_3ktas(SB),$0 + MOVW R1, R21 +btas: + MOVW R21, R1 + MOVB R0, 1(R1) + NOOP + COP3 + BLTZ R1, btas + RET + + TEXT C_4ktas(SB), $0 + MOVW R1, R2 /* address of key */ +tas1: + MOVW $1, R3 + LL(2, 1) + NOOP + SC(2, 3) + NOOP + BEQ R3, tas1 + RET + + TEXT C_fcr0(SB), $0 + MOVW FCR0, R1 + RET |