[PATCH v4 05/30] xen/riscv: introduce guest_atomics.h

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V4:
 - Drop in guest_testop() and guest_bitop() casts of function arguments.
 - Change "commit message" to "commit title" in "Changes in V3" to be more 
precise about
   what was changed.
 - use BUG_ON("unimplemented") instead of ASSERT_UNREACHABLE
---
Changes in V3:
 - update the commit title
 - drop TODO commit.
 - add ASSERT_UNREACHABLE for stubs guest functions.
 - Add SPDX & footer
---
Changes in V2:
 - Nothing changed. Only rebase.
---
 xen/arch/riscv/include/asm/guest_atomics.h | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 xen/arch/riscv/include/asm/guest_atomics.h

diff --git a/xen/arch/riscv/include/asm/guest_atomics.h 
b/xen/arch/riscv/include/asm/guest_atomics.h
new file mode 100644
index 0000000000..de54914454
--- /dev/null
+++ b/xen/arch/riscv/include/asm/guest_atomics.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_RISCV_GUEST_ATOMICS_H
+#define __ASM_RISCV_GUEST_ATOMICS_H
+
+#include <xen/bug.h>
+
+#define guest_testop(name)                                                  \
+static inline int guest_##name(struct domain *d, int nr, volatile void *p)  \
+{                                                                           \
+    BUG_ON("unimplemented");                                                \
+                                                                            \
+    return 0;                                                               \
+}
+
+#define guest_bitop(name)                                                   \
+static inline void guest_##name(struct domain *d, int nr, volatile void *p) \
+{                                                                           \
+    BUG_ON("unimplemented");                                                \
+}
+
+guest_bitop(set_bit)
+guest_bitop(clear_bit)
+guest_bitop(change_bit)
+
+#undef guest_bitop
+
+guest_testop(test_and_set_bit)
+guest_testop(test_and_clear_bit)
+guest_testop(test_and_change_bit)
+
+#undef guest_testop
+
+#define guest_test_bit(d, nr, p) ((void)(d), test_bit(nr, p))
+
+#endif /* __ASM_RISCV_GUEST_ATOMICS_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.43.0