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From: Andrew Turner <andrew@FreeBSD.org>
Date: Fri, 2 Sep 2016 10:13:52 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r305285 - in head/sys/arm64: arm64 include
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Author: andrew
Date: Fri Sep  2 10:13:51 2016
New Revision: 305285
URL: https://svnweb.freebsd.org/changeset/base/305285

Log:
  Add a pc_clock pcpu field and use it to implement cpu_est_clockrate. This
  will allow drivers that manage the clock frequency to communicate this with
  the reset of the kernel.
  
  Reported by:	jmcneill
  MFC after:	1 week
  Sponsored by:	ABT Systems Ltd

Modified:
  head/sys/arm64/arm64/machdep.c
  head/sys/arm64/include/pcpu.h

Modified: head/sys/arm64/arm64/machdep.c
==============================================================================
--- head/sys/arm64/arm64/machdep.c	Fri Sep  2 08:44:14 2016	(r305284)
+++ head/sys/arm64/arm64/machdep.c	Fri Sep  2 10:13:51 2016	(r305285)
@@ -416,8 +416,17 @@ cpu_flush_dcache(void *ptr, size_t len)
 int
 cpu_est_clockrate(int cpu_id, uint64_t *rate)
 {
+	struct pcpu *pc;
 
-	panic("ARM64TODO: cpu_est_clockrate");
+	pc = pcpu_find(cpu_id);
+	if (pc == NULL || rate == NULL)
+		return (EINVAL);
+
+	if (pc->pc_clock == 0)
+		return (EOPNOTSUPP);
+
+	*rate = pc->pc_clock;
+	return (0);
 }
 
 void

Modified: head/sys/arm64/include/pcpu.h
==============================================================================
--- head/sys/arm64/include/pcpu.h	Fri Sep  2 08:44:14 2016	(r305284)
+++ head/sys/arm64/include/pcpu.h	Fri Sep  2 10:13:51 2016	(r305285)
@@ -38,7 +38,8 @@
 #define	PCPU_MD_FIELDS							\
 	u_int	pc_acpi_id;	/* ACPI CPU id */		\
 	u_int	pc_midr;	/* stored MIDR value */	\
-	char __pad[121]
+	uint64_t pc_clock;						\
+	char __pad[113]
 
 #ifdef _KERNEL