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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 18/39] xen/riscv: introduce cmpxchg.h
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V2:
- update the comment at the top of the header.
- change xen/lib.h to xen/bug.h.
- sort inclusion of headers properly.
---
xen/arch/riscv/include/asm/cmpxchg.h | 379 +++++++++++++++++++++++++++
1 file changed, 379 insertions(+)
create mode 100644 xen/arch/riscv/include/asm/cmpxchg.h
diff --git a/xen/arch/riscv/include/asm/cmpxchg.h
b/xen/arch/riscv/include/asm/cmpxchg.h
new file mode 100644
index 0000000000..c535bc9660
--- /dev/null
+++ b/xen/arch/riscv/include/asm/cmpxchg.h
@@ -0,0 +1,379 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Taken and modified from Linux.
+ *
+ * Copyright (C) 2014 Regents of the University of California
+ */
+
+#ifndef _ASM_RISCV_CMPXCHG_H
+#define _ASM_RISCV_CMPXCHG_H
+
+#include <xen/bug.h>
+
+#include <asm/fence.h>
+#include <asm/system.h>
+
+#define __xchg_relaxed(ptr, new, size) \
+({ \
+ __typeof__(ptr) __ptr = (ptr); \
+ __typeof__(new) __new = (new); \
+ __typeof__(*(ptr)) __ret; \
+ switch (size) { \
+ case 4: \
+ __asm__ __volatile__ ( \
+ " amoswap.w %0, %2, %1\n" \
+ : "=r" (__ret), "+A" (*__ptr) \
+ : "r" (__new) \
+ : "memory"); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ " amoswap.d %0, %2, %1\n" \
+ : "=r" (__ret), "+A" (*__ptr) \
+ : "r" (__new) \
+ : "memory"); \
+ break; \
+ default: \
+ ASSERT_UNREACHABLE(); \
+ } \
+ __ret; \
+})
+
+#define xchg_relaxed(ptr, x) \
+({ \
+ __typeof__(*(ptr)) _x_ = (x); \
+ (__typeof__(*(ptr))) __xchg_relaxed((ptr), \
+ _x_, sizeof(*(ptr))); \
+})
+
+#define __xchg_acquire(ptr, new, size) \
+({ \
+ __typeof__(ptr) __ptr = (ptr); \
+ __typeof__(new) __new = (new); \
+ __typeof__(*(ptr)) __ret; \
+ switch (size) { \
+ case 4: \
+ __asm__ __volatile__ ( \
+ " amoswap.w %0, %2, %1\n" \
+ RISCV_ACQUIRE_BARRIER \
+ : "=r" (__ret), "+A" (*__ptr) \
+ : "r" (__new) \
+ : "memory"); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ " amoswap.d %0, %2, %1\n" \
+ RISCV_ACQUIRE_BARRIER \
+ : "=r" (__ret), "+A" (*__ptr) \
+ : "r" (__new) \
+ : "memory"); \
+ break; \
+ default: \
+ ASSERT_UNREACHABLE(); \
+ } \
+ __ret; \
+})
+
+#define xchg_acquire(ptr, x) \
+({ \
+ __typeof__(*(ptr)) _x_ = (x); \
+ (__typeof__(*(ptr))) __xchg_acquire((ptr), \
+ _x_, sizeof(*(ptr))); \
+})
+
+#define __xchg_release(ptr, new, size) \
+({ \
+ __typeof__(ptr) __ptr = (ptr); \
+ __typeof__(new) __new = (new); \
+ __typeof__(*(ptr)) __ret; \
+ switch (size) { \
+ case 4: \
+ __asm__ __volatile__ ( \
+ RISCV_RELEASE_BARRIER \
+ " amoswap.w %0, %2, %1\n" \
+ : "=r" (__ret), "+A" (*__ptr) \
+ : "r" (__new) \
+ : "memory"); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ RISCV_RELEASE_BARRIER \
+ " amoswap.d %0, %2, %1\n" \
+ : "=r" (__ret), "+A" (*__ptr) \
+ : "r" (__new) \
+ : "memory"); \
+ break; \
+ default: \
+ ASSERT_UNREACHABLE(); \
+ } \
+ __ret; \
+})
+
+#define xchg_release(ptr, x) \
+({ \
+ __typeof__(*(ptr)) _x_ = (x); \
+ (__typeof__(*(ptr))) __xchg_release((ptr), \
+ _x_, sizeof(*(ptr))); \
+})
+
+#define __xchg(ptr, new, size) \
+({ \
+ __typeof__(ptr) __ptr = (ptr); \
+ __typeof__(new) __new = (new); \
+ __typeof__(*(ptr)) __ret; \
+ switch (size) { \
+ case 4: \
+ __asm__ __volatile__ ( \
+ " amoswap.w.aqrl %0, %2, %1\n" \
+ : "=r" (__ret), "+A" (*__ptr) \
+ : "r" (__new) \
+ : "memory"); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ " amoswap.d.aqrl %0, %2, %1\n" \
+ : "=r" (__ret), "+A" (*__ptr) \
+ : "r" (__new) \
+ : "memory"); \
+ break; \
+ default: \
+ __ret = 0; \
+ ASSERT_UNREACHABLE(); \
+ } \
+ __ret; \
+})
+
+#define xchg(ptr, x) \
+({ \
+ __typeof__(*(ptr)) _x_ = (x); \
+ (__typeof__(*(ptr))) __xchg((ptr), _x_, sizeof(*(ptr))); \
+})
+
+#define xchg32(ptr, x) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 4); \
+ xchg((ptr), (x)); \
+})
+
+#define xchg64(ptr, x) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ xchg((ptr), (x)); \
+})
+
+/*
+ * Atomic compare and exchange. Compare OLD with MEM, if identical,
+ * store NEW in MEM. Return the initial value in MEM. Success is
+ * indicated by comparing RETURN with OLD.
+ */
+#define __cmpxchg_relaxed(ptr, old, new, size) \
+({ \
+ __typeof__(ptr) __ptr = (ptr); \
+ __typeof__(*(ptr)) __old = (old); \
+ __typeof__(*(ptr)) __new = (new); \
+ __typeof__(*(ptr)) __ret; \
+ register unsigned int __rc; \
+ switch (size) { \
+ case 4: \
+ __asm__ __volatile__ ( \
+ "0: lr.w %0, %2\n" \
+ " bne %0, %z3, 1f\n" \
+ " sc.w %1, %z4, %2\n" \
+ " bnez %1, 0b\n" \
+ "1:\n" \
+ : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
+ : "rJ" (__old), "rJ" (__new) \
+ : "memory"); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ "0: lr.d %0, %2\n" \
+ " bne %0, %z3, 1f\n" \
+ " sc.d %1, %z4, %2\n" \
+ " bnez %1, 0b\n" \
+ "1:\n" \
+ : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
+ : "rJ" (__old), "rJ" (__new) \
+ : "memory"); \
+ break; \
+ default: \
+ ASSERT_UNREACHABLE(); \
+ } \
+ __ret; \
+})
+
+#define cmpxchg_relaxed(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg_relaxed((ptr), \
+ _o_, _n_, sizeof(*(ptr))); \
+})
+
+#define __cmpxchg_acquire(ptr, old, new, size) \
+({ \
+ __typeof__(ptr) __ptr = (ptr); \
+ __typeof__(*(ptr)) __old = (old); \
+ __typeof__(*(ptr)) __new = (new); \
+ __typeof__(*(ptr)) __ret; \
+ register unsigned int __rc; \
+ switch (size) { \
+ case 4: \
+ __asm__ __volatile__ ( \
+ "0: lr.w %0, %2\n" \
+ " bne %0, %z3, 1f\n" \
+ " sc.w %1, %z4, %2\n" \
+ " bnez %1, 0b\n" \
+ RISCV_ACQUIRE_BARRIER \
+ "1:\n" \
+ : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
+ : "rJ" (__old), "rJ" (__new) \
+ : "memory"); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ "0: lr.d %0, %2\n" \
+ " bne %0, %z3, 1f\n" \
+ " sc.d %1, %z4, %2\n" \
+ " bnez %1, 0b\n" \
+ RISCV_ACQUIRE_BARRIER \
+ "1:\n" \
+ : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
+ : "rJ" (__old), "rJ" (__new) \
+ : "memory"); \
+ break; \
+ default: \
+ ASSERT_UNREACHABLE(); \
+ } \
+ __ret; \
+})
+
+#define cmpxchg_acquire(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg_acquire((ptr), \
+ _o_, _n_, sizeof(*(ptr))); \
+})
+
+#define __cmpxchg_release(ptr, old, new, size) \
+({ \
+ __typeof__(ptr) __ptr = (ptr); \
+ __typeof__(*(ptr)) __old = (old); \
+ __typeof__(*(ptr)) __new = (new); \
+ __typeof__(*(ptr)) __ret; \
+ register unsigned int __rc; \
+ switch (size) { \
+ case 4: \
+ __asm__ __volatile__ ( \
+ RISCV_RELEASE_BARRIER \
+ "0: lr.w %0, %2\n" \
+ " bne %0, %z3, 1f\n" \
+ " sc.w %1, %z4, %2\n" \
+ " bnez %1, 0b\n" \
+ "1:\n" \
+ : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
+ : "rJ" (__old), "rJ" (__new) \
+ : "memory"); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ RISCV_RELEASE_BARRIER \
+ "0: lr.d %0, %2\n" \
+ " bne %0, %z3, 1f\n" \
+ " sc.d %1, %z4, %2\n" \
+ " bnez %1, 0b\n" \
+ "1:\n" \
+ : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
+ : "rJ" (__old), "rJ" (__new) \
+ : "memory"); \
+ break; \
+ default: \
+ ASSERT_UNREACHABLE(); \
+ } \
+ __ret; \
+})
+
+#define cmpxchg_release(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg_release((ptr), \
+ _o_, _n_, sizeof(*(ptr))); \
+})
+
+#define __cmpxchg(ptr, old, new, size) \
+({ \
+ __typeof__(ptr) __ptr = (ptr); \
+ __typeof__(*(ptr)) __old = (__typeof__(*(ptr)))(old);
\
+ __typeof__(*(ptr)) __new = (__typeof__(*(ptr)))(new);
\
+ __typeof__(*(ptr)) __ret; \
+ register unsigned int __rc; \
+ switch (size) { \
+ case 4: \
+ __asm__ __volatile__ ( \
+ "0: lr.w %0, %2\n" \
+ " bne %0, %z3, 1f\n" \
+ " sc.w.rl %1, %z4, %2\n" \
+ " bnez %1, 0b\n" \
+ " fence rw, rw\n" \
+ "1:\n" \
+ : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
+ : "rJ" (__old), "rJ" (__new) \
+ : "memory"); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ "0: lr.d %0, %2\n" \
+ " bne %0, %z3, 1f\n" \
+ " sc.d.rl %1, %z4, %2\n" \
+ " bnez %1, 0b\n" \
+ " fence rw, rw\n" \
+ "1:\n" \
+ : "=&r" (__ret), "=&r" (__rc), "+A" (*__ptr) \
+ : "rJ" (__old), "rJ" (__new) \
+ : "memory"); \
+ break; \
+ default: \
+ __ret = 0; \
+ ASSERT_UNREACHABLE(); \
+ } \
+ __ret; \
+})
+
+#define cmpxchg(ptr, o, n) \
+({ \
+ __typeof__(*(ptr)) _o_ = (o); \
+ __typeof__(*(ptr)) _n_ = (n); \
+ (__typeof__(*(ptr))) __cmpxchg((ptr), \
+ _o_, _n_, sizeof(*(ptr))); \
+})
+
+#define cmpxchg_local(ptr, o, n) \
+ (__cmpxchg_relaxed((ptr), (o), (n), sizeof(*(ptr))))
+
+#define cmpxchg32(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 4); \
+ cmpxchg((ptr), (o), (n)); \
+})
+
+#define cmpxchg32_local(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 4); \
+ cmpxchg_relaxed((ptr), (o), (n)) \
+})
+
+#define cmpxchg64(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ cmpxchg((ptr), (o), (n)); \
+})
+
+#define cmpxchg64_local(ptr, o, n) \
+({ \
+ BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
+ cmpxchg_relaxed((ptr), (o), (n)); \
+})
+
+#endif /* _ASM_RISCV_CMPXCHG_H */
--
2.42.0
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