From b68eeefef34d4a742124d922e2a23613b9bcb1e5 Mon Sep 17 00:00:00 2001
From: adventuresin9 <adventuresin9@gmail.com>
Date: Wed, 8 Mar 2023 05:14:31 +0000
Subject: sys/src/libc/mips/tas.s: _tas() for spim

---
 sys/src/libc/spim/tas.s | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 sys/src/libc/spim/tas.s

(limited to 'sys/src/libc')

diff --git a/sys/src/libc/spim/tas.s b/sys/src/libc/spim/tas.s
new file mode 100644
index 000000000..807fd121d
--- /dev/null
+++ b/sys/src/libc/spim/tas.s
@@ -0,0 +1,18 @@
+/*
+ *	4K tas for spim
+ */
+
+#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
+
+	TEXT	_tas(SB), $0
+	MOVW	R1, R2		/* address of key */
+tas1:
+	MOVW	$1, R3
+	LL(2, 1)
+	NOOP
+	SC(2, 3)
+	NOOP
+	BEQ	R3, tas1
+	RET
-- 
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