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diff --git a/sys/amd64/include/pcpu.h b/sys/amd64/include/pcpu.h
--- a/sys/amd64/include/pcpu.h
+++ b/sys/amd64/include/pcpu.h
@@ -113,18 +113,74 @@
#define MONITOR_STOPSTATE_RUNNING 0
#define MONITOR_STOPSTATE_STOPPED 1
-/*
- * Evaluates to the byte offset of the per-cpu variable name.
- */
-#define __pcpu_offset(name) \
- __offsetof(struct pcpu, name)
-
/*
* Evaluates to the type of the per-cpu variable name.
*/
#define __pcpu_type(name) \
__typeof(((struct pcpu *)0)->name)
+#ifdef __SEG_GS
+#define get_pcpu() __extension__ ({ \
+ static struct pcpu __seg_gs *__pc = 0; \
+ \
+ __pc->pc_prvspace; \
+})
+
+/*
+ * Evaluates to the address of the per-cpu variable name.
+ */
+#define __PCPU_PTR(name) __extension__ ({ \
+ struct pcpu *__pc = get_pcpu(); \
+ \
+ &__pc->name; \
+})
+
+/*
+ * Evaluates to the value of the per-cpu variable name.
+ */
+#define __PCPU_GET(name) __extension__ ({ \
+ static struct pcpu __seg_gs *__pc = 0; \
+ \
+ __pc->name; \
+})
+
+/*
+ * Adds the value to the per-cpu counter name. The implementation
+ * must be atomic with respect to interrupts.
+ */
+#define __PCPU_ADD(name, val) do { \
+ static struct pcpu __seg_gs *__pc = 0; \
+ __pcpu_type(name) __val; \
+ \
+ __val = (val); \
+ if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
+ sizeof(__val) == 4 || sizeof(__val) == 8) { \
+ __pc->name += __val; \
+ } else \
+ *__PCPU_PTR(name) += __val; \
+} while (0)
+
+/*
+ * Sets the value of the per-cpu variable name to value val.
+ */
+#define __PCPU_SET(name, val) { \
+ static struct pcpu __seg_gs *__pc = 0; \
+ __pcpu_type(name) __val; \
+ \
+ __val = (val); \
+ if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
+ sizeof(__val) == 4 || sizeof(__val) == 8) { \
+ __pc->name = __val; \
+ } else \
+ *__PCPU_PTR(name) = __val; \
+} while (0)
+#else /* !__SEG_GS */
+/*
+ * Evaluates to the byte offset of the per-cpu variable name.
+ */
+#define __pcpu_offset(name) \
+ __offsetof(struct pcpu, name)
+
/*
* Evaluates to the address of the per-cpu variable name.
*/
@@ -210,6 +266,7 @@
: "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
__pc; \
})
+#endif /* !__SEG_GS */
#define PCPU_GET(member) __PCPU_GET(pc_ ## member)
#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)

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