1 files changed, 68 insertions, 0 deletions

diff --git a/include/asm-x86/percpu_64.h b/include/asm-x86/percpu_64.h
new file mode 100644
index 000000000000..5abd48270101
--- /dev/null
+++ b/include/asm-x86/percpu_64.h
@@ -0,0 +1,68 @@
+#ifndef _ASM_X8664_PERCPU_H_
+#define _ASM_X8664_PERCPU_H_
+#include <linux/compiler.h>
+
+/* Same as asm-generic/percpu.h, except that we store the per cpu offset
+   in the PDA. Longer term the PDA and every per cpu variable
+   should be just put into a single section and referenced directly
+   from %gs */
+
+#ifdef CONFIG_SMP
+
+#include <asm/pda.h>
+
+#define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset)
+#define __my_cpu_offset() read_pda(data_offset)
+
+#define per_cpu_offset(x) (__per_cpu_offset(x))
+
+/* Separate out the type, so (int[3], foo) works. */
+#define DEFINE_PER_CPU(type, name) \
+    __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
+
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)               \
+    __attribute__((__section__(".data.percpu.shared_aligned"))) \
+    __typeof__(type) per_cpu__##name                            \
+    ____cacheline_internodealigned_in_smp
+
+/* var is in discarded region: offset to particular copy we want */
+#define per_cpu(var, cpu) (*({                          \
+        extern int simple_identifier_##var(void);       \
+        RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)); }))
+#define __get_cpu_var(var) (*({                         \
+        extern int simple_identifier_##var(void);       \
+        RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))
+#define __raw_get_cpu_var(var) (*({                     \
+        extern int simple_identifier_##var(void);       \
+        RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); }))
+
+/* A macro to avoid #include hell... */
+#define percpu_modcopy(pcpudst, src, size)                      \
+do {                                                            \
+        unsigned int __i;                                       \
+        for_each_possible_cpu(__i)                              \
+                memcpy((pcpudst)+__per_cpu_offset(__i),         \
+                       (src), (size));                          \
+} while (0)
+
+extern void setup_per_cpu_areas(void);
+
+#else /* ! SMP */
+
+#define DEFINE_PER_CPU(type, name) \
+    __typeof__(type) per_cpu__##name
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)       \
+    DEFINE_PER_CPU(type, name)
+
+#define per_cpu(var, cpu)                       (*((void)(cpu), &per_cpu__##var))
+#define __get_cpu_var(var)                      per_cpu__##var
+#define __raw_get_cpu_var(var)                  per_cpu__##var
+
+#endif  /* SMP */
+
+#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
+
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
+
+#endif /* _ASM_X8664_PERCPU_H_ */