1 files changed, 41 insertions, 0 deletions

diff --git a/arch/x86/include/asm/rmwcc.h b/arch/x86/include/asm/rmwcc.h
new file mode 100644
index 000000000000..1ff990f1de8e
--- /dev/null
+++ b/arch/x86/include/asm/rmwcc.h
@@ -0,0 +1,41 @@
+#ifndef _ASM_X86_RMWcc
+#define _ASM_X86_RMWcc
+
+#ifdef CC_HAVE_ASM_GOTO
+
+#define __GEN_RMWcc(fullop, var, cc, ...)                               \
+do {                                                                    \
+        asm_volatile_goto (fullop "; j" cc " %l[cc_label]"              \
+                        : : "m" (var), ## __VA_ARGS__                   \
+                        : "memory" : cc_label);                         \
+        return 0;                                                       \
+cc_label:                                                               \
+        return 1;                                                       \
+} while (0)
+
+#define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
+        __GEN_RMWcc(op " " arg0, var, cc)
+
+#define GEN_BINARY_RMWcc(op, var, val, arg0, cc)                        \
+        __GEN_RMWcc(op " %1, " arg0, var, cc, "er" (val))
+
+#else /* !CC_HAVE_ASM_GOTO */
+
+#define __GEN_RMWcc(fullop, var, cc, ...)                               \
+do {                                                                    \
+        char c;                                                         \
+        asm volatile (fullop "; set" cc " %1"                           \
+                        : "+m" (var), "=qm" (c)                         \
+                        : __VA_ARGS__ : "memory");                      \
+        return c != 0;                                                  \
+} while (0)
+
+#define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
+        __GEN_RMWcc(op " " arg0, var, cc)
+
+#define GEN_BINARY_RMWcc(op, var, val, arg0, cc)                        \
+        __GEN_RMWcc(op " %2, " arg0, var, cc, "er" (val))
+
+#endif /* CC_HAVE_ASM_GOTO */
+
+#endif /* _ASM_X86_RMWcc */