[PATCH v2 06/13] or1k: Atomics and Locking primitives

[Stafford Horne <shorne@gmail.com>]

---
 sysdeps/or1k/atomic-machine.h | 79 +++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 sysdeps/or1k/atomic-machine.h

diff --git a/sysdeps/or1k/atomic-machine.h b/sysdeps/or1k/atomic-machine.h
new file mode 100644
index 0000000000..813bbf35cc
--- /dev/null
+++ b/sysdeps/or1k/atomic-machine.h
@@ -0,0 +1,79 @@
+/* Atomic operations.  OpenRISC version.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef __OR1K_ATOMIC_H_
+#define __OR1K_ATOMIC_H_
+
+#include <stdint.h>
+
+typedef int32_t atomic32_t;
+typedef uint32_t uatomic32_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+#define __HAVE_64B_ATOMICS 0
+#define USE_ATOMIC_COMPILER_BUILTINS 1
+#define ATOMIC_EXCHANGE_USES_CAS 1
+
+#define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
+  ({                                                                    \
+    typeof (*mem) __oldval = (oldval);                                  \
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,   \
+                                  model, __ATOMIC_RELAXED);             \
+  })
+
+#define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
+  (abort (), (__typeof (*mem)) 0)
+
+#define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
+  (abort (), (__typeof (*mem)) 0)
+
+#define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
+  ({                                                                    \
+    typeof (*mem) __oldval = (oldval);                                  \
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    \
+                                 model, __ATOMIC_RELAXED);              \
+    __oldval;                                                           \
+  })
+
+#define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
+  (abort (), (__typeof (*mem)) 0)
+
+#define atomic_compare_and_exchange_bool_acq(mem, new, old)		\
+  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,		\
+			mem, new, old, __ATOMIC_ACQUIRE)
+
+#define atomic_compare_and_exchange_val_acq(mem, new, old)		\
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,		\
+		       mem, new, old, __ATOMIC_ACQUIRE)
+
+#define atomic_full_barrier() ({ asm volatile ("l.msync" ::: "memory"); })
+
+#endif /* atomic-machine.h */
-- 
2.31.1