Date: Thu, 20 Nov 2008 09:43:40 +0100 From: Marc =?iso-8859-1?q?L=F6rner?= <marc.loerner@hob.de> To: freebsd-ia64@freebsd.org Subject: sys/ia64/include/pcpu.h patch proposal Message-ID: <200811200943.40672.marc.loerner@hob.de>
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Hello,
attached is a patch of pcpu.h against current to make access of
pcpu-structures preemption-ready (like in amd64).
Regards,
Marc Loerner
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filename="pcpu.h.patch"
--- pcpu.h.orig 2008-11-20 09:37:40.000000000 +0100
+++ pcpu.h 2008-11-20 09:36:13.000000000 +0100
@@ -45,11 +45,77 @@
register struct pcpu *pcpup __asm__("r13");
+void pcpu_initclock(void);
+
+#if defined(lint)
#define PCPU_GET(member) (pcpup->pc_ ## member)
#define PCPU_PTR(member) (&pcpup->pc_ ## member)
#define PCPU_SET(member,value) (pcpup->pc_ ## member = (value))
-void pcpu_initclock(void);
+#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE__TYPEOF) \
+ && defined(__GNUCLIKE__OFFSETOF)
+
+/*
+ * Evaluates to the byte offset of the per-cpu variable name.
+ */
+#define __pcpu_offset(name) \
+ __offsetof(struct pcpu, name)
+
+/*
+ * Evalutes to the type of the per-cpu variable name.
+ */
+#define __pcpu_type(name) \
+ __typeof(((struct pcpu *)0)->name)
+
+/*
+ * Evaluates to the address of the per-cpu variable name.
+ */
+#define __PCPU_PTR(name) __extension__ ({ \
+ __pcpu_type(name) *__p; \
+ \
+ __asm__volatile("add %0=%1, r13\n\n" \
+ : "=r" (__p) \
+ : "i" (__pcpu_offset(name))); \
+ \
+ __p; \
+})
+
+/*
+ * Evaluates to the value of the per-cpu variable name.
+ */
+#define __PCPU_GET(name) __extension__ ({ \
+ __pcpu_type(name) __result; \
+ \
+ __result = *__PCPU_PTR(name); \
+ \
+ __result; \
+})
+
+/*
+ * Sets the value of the per-cpu variable name to value val.
+ */
+#define __PCPU_SET(name, val) { \
+ __pcpu_type(name) __val = (val); \
+ \
+ *__PCPU_PTR(name) = __val; \
+}
+
+#define PCPU_GET(member) __PCPU_GET(pc_ ## member)
+#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
+#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
+
+static __inline struct thread* __curthread(void)
+{
+ struct thread *td;
+
+ __asm__volatile("ld8 %0=[r13]\n\n" : "=r" (td));
+ return (td);
+}
+#define curthread (__curthread())
+
+#else
+#error this file needs to be ported to your compiler
+#endif
#endif /* _KERNEL */
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