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From: Andrew Turner <andrew@FreeBSD.org>
Date: Wed, 21 Sep 2016 09:45:14 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r306085 - in stable/11/sys/arm64: arm64 include
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Author: andrew
Date: Wed Sep 21 09:45:14 2016
New Revision: 306085
URL: https://svnweb.freebsd.org/changeset/base/306085

Log:
  MFC 305285:
  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.
  
  Sponsored by:   ABT Systems Ltd

Modified:
  stable/11/sys/arm64/arm64/machdep.c
  stable/11/sys/arm64/include/pcpu.h
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/arm64/arm64/machdep.c
==============================================================================
--- stable/11/sys/arm64/arm64/machdep.c	Wed Sep 21 09:06:06 2016	(r306084)
+++ stable/11/sys/arm64/arm64/machdep.c	Wed Sep 21 09:45:14 2016	(r306085)
@@ -407,8 +407,17 @@ 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: stable/11/sys/arm64/include/pcpu.h
==============================================================================
--- stable/11/sys/arm64/include/pcpu.h	Wed Sep 21 09:06:06 2016	(r306084)
+++ stable/11/sys/arm64/include/pcpu.h	Wed Sep 21 09:45:14 2016	(r306085)
@@ -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