LoongArch is a new architecture that is already supported by linux-6.1,
gcc-12, and I want to add LoongArch spinlock support in s_lock.h.
From 68c252b4aab5d116b1bf791e16f072fb3ee0161f Mon Sep 17 00:00:00 2001
From: Zang Ruochen <zangruoc...@loongson.cn>
Date: Thu, 1 Jun 2023 15:30:44 +0800
Subject: [PATCH] Add LoongArch spinlock support in s_lock.h.
---
src/include/storage/s_lock.h | 40 ++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/src/include/storage/s_lock.h b/src/include/storage/s_lock.h
index c9fa84cc43..bec55856af 100644
--- a/src/include/storage/s_lock.h
+++ b/src/include/storage/s_lock.h
@@ -529,6 +529,46 @@ do \
#endif /* __mips__ && !__sgi */
+/* LoongArch */
+#if defined(__loongarch__)
+#define HAS_TEST_AND_SET
+
+typedef unsigned int slock_t;
+
+#define TAS(lock) tas(lock)
+
+static __inline__ int
+tas(volatile slock_t *lock)
+{
+ register volatile slock_t *_l = lock;
+ register int _res;
+ register int _tmp;
+
+ __asm__ __volatile__(
+ " ll.w %0, %2 \n"
+ " ori %1, %0, 1 \n"
+ " sc.w %1, %2 \n"
+ " xori %1, %1, 1 \n"
+ " or %0, %0, %1 \n"
+ " dbar 0 \n"
+: "=&r" (_res), "=&r" (_tmp), "+ZC" (*_l)
+: /* no inputs */
+: "memory");
+ return _res;
+}
+
+#define S_UNLOCK(lock) \
+do \
+{ \
+ __asm__ __volatile__( \
+ " dbar 0 \n" \
+: /* no outputs */ \
+: /* no inputs */ \
+: "memory"); \
+ *((volatile slock_t *) (lock)) = 0; \
+} while (0)
+
+#endif /* LoongArch */
#if defined(__hppa) || defined(__hppa__) /* HP PA-RISC */
/*
--
2.20.1
