alpha: Use qemu+cserve provided high-res clock and alarm.

QEMU provides a high-resolution timer and alarm; use this for
a clock source and clock event source when available.

Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 70 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/pal.h b/arch/alpha/include/asm/pal.h
index e78ec9bcc768..5422a47646fc 100644
--- a/arch/alpha/include/asm/pal.h
+++ b/arch/alpha/include/asm/pal.h
@@ -112,5 +112,75 @@ __CALL_PAL_RW1(wtint, unsigned long, unsigned long);
 #define tbiap()         __tbi(-1, /* no second argument */)
 #define tbia()          __tbi(-2, /* no second argument */)
 
+/*
+ * QEMU Cserv routines..
+ */
+
+static inline unsigned long
+qemu_get_walltime(void)
+{
+        register unsigned long v0 __asm__("$0");
+        register unsigned long a0 __asm__("$16") = 3;
+
+        asm("call_pal %2 # cserve get_time"
+            : "=r"(v0), "+r"(a0)
+            : "i"(PAL_cserve)
+            : "$17", "$18", "$19", "$20", "$21");
+
+        return v0;
+}
+
+static inline unsigned long
+qemu_get_alarm(void)
+{
+        register unsigned long v0 __asm__("$0");
+        register unsigned long a0 __asm__("$16") = 4;
+
+        asm("call_pal %2 # cserve get_alarm"
+            : "=r"(v0), "+r"(a0)
+            : "i"(PAL_cserve)
+            : "$17", "$18", "$19", "$20", "$21");
+
+        return v0;
+}
+
+static inline void
+qemu_set_alarm_rel(unsigned long expire)
+{
+        register unsigned long a0 __asm__("$16") = 5;
+        register unsigned long a1 __asm__("$17") = expire;
+
+        asm volatile("call_pal %2 # cserve set_alarm_rel"
+                     : "+r"(a0), "+r"(a1)
+                     : "i"(PAL_cserve)
+                     : "$0", "$18", "$19", "$20", "$21");
+}
+
+static inline void
+qemu_set_alarm_abs(unsigned long expire)
+{
+        register unsigned long a0 __asm__("$16") = 6;
+        register unsigned long a1 __asm__("$17") = expire;
+
+        asm volatile("call_pal %2 # cserve set_alarm_abs"
+                     : "+r"(a0), "+r"(a1)
+                     : "i"(PAL_cserve)
+                     : "$0", "$18", "$19", "$20", "$21");
+}
+
+static inline unsigned long
+qemu_get_vmtime(void)
+{
+        register unsigned long v0 __asm__("$0");
+        register unsigned long a0 __asm__("$16") = 7;
+
+        asm("call_pal %2 # cserve get_time"
+            : "=r"(v0), "+r"(a0)
+            : "i"(PAL_cserve)
+            : "$17", "$18", "$19", "$20", "$21");
+
+        return v0;
+}
+
 #endif /* !__ASSEMBLY__ */
 #endif /* __ALPHA_PAL_H */