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[target-arm,v4,4/7] target-arm: Add arm_ccnt_enabled function

Message ID e1a64f17a756e06c8bda8238ad4826d705049f7a.1409025949.git.peter.crosthwaite@xilinx.com
State New
Headers show

Commit Message

Peter Crosthwaite Aug. 26, 2014, 4:11 a.m. UTC 
From: Alistair Francis <alistair.francis@xilinx.com>

Include a helper function to determine if the CCNT counter
is enabled.

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
[ PC changes
  * Remove EL based checks
]
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
---
Changed since v3
Remove checks based on EL.
Changed since v2 (PMM review):
Blank line for readability
Use switch instead of cascading ifs.
Use true and false.
Drop extraneous #endif #if

 target-arm/helper.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 13507f7..e6c82ab 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -548,6 +548,18 @@  static CPAccessResult pmreg_access(CPUARMState *env, const ARMCPRegInfo *ri)
 }
 
 #ifndef CONFIG_USER_ONLY
+
+static inline bool arm_ccnt_enabled(CPUARMState *env)
+{
+    /* This does not support checking PMCCFILTR_EL0 register */
+
+    if (!(env->cp15.c9_pmcr & PMCRE)) {
+        return false;
+    }
+
+    return true;
+}
+
 static void pmcr_write(CPUARMState *env, const ARMCPRegInfo *ri,
                        uint64_t value)
 {