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-rw-r--r--arch/x86/lib/cmpxchg16b_emu.S59
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/x86/lib/cmpxchg16b_emu.S b/arch/x86/lib/cmpxchg16b_emu.S
new file mode 100644
index 000000000..40a172541
--- /dev/null
+++ b/arch/x86/lib/cmpxchg16b_emu.S
@@ -0,0 +1,59 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ *
+ */
+#include <linux/linkage.h>
+#include <asm/dwarf2.h>
+#include <asm/percpu.h>
+
+.text
+
+/*
+ * Inputs:
+ * %rsi : memory location to compare
+ * %rax : low 64 bits of old value
+ * %rdx : high 64 bits of old value
+ * %rbx : low 64 bits of new value
+ * %rcx : high 64 bits of new value
+ * %al : Operation successful
+ */
+ENTRY(this_cpu_cmpxchg16b_emu)
+CFI_STARTPROC
+
+#
+# Emulate 'cmpxchg16b %gs:(%rsi)' except we return the result in %al not
+# via the ZF. Caller will access %al to get result.
+#
+# Note that this is only useful for a cpuops operation. Meaning that we
+# do *not* have a fully atomic operation but just an operation that is
+# *atomic* on a single cpu (as provided by the this_cpu_xx class of
+# macros).
+#
+ pushfq_cfi
+ cli
+
+ cmpq PER_CPU_VAR((%rsi)), %rax
+ jne .Lnot_same
+ cmpq PER_CPU_VAR(8(%rsi)), %rdx
+ jne .Lnot_same
+
+ movq %rbx, PER_CPU_VAR((%rsi))
+ movq %rcx, PER_CPU_VAR(8(%rsi))
+
+ CFI_REMEMBER_STATE
+ popfq_cfi
+ mov $1, %al
+ ret
+
+ CFI_RESTORE_STATE
+.Lnot_same:
+ popfq_cfi
+ xor %al,%al
+ ret
+
+CFI_ENDPROC
+
+ENDPROC(this_cpu_cmpxchg16b_emu)