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target-arm: Implement pmccntr_sync function

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This is used to synchronise the PMCCNTR counter and swap its
state between enabled and disabled if required. It must always
be called twice, both before and after any logic that could
change the state of the PMCCNTR counter.

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 62811d4c0f7b1384f7aab62ea2fcfda3dcb0db50.1409025949.git.peter.crosthwaite@xilinx.com
[PMM: fixed minor typos in pmccntr_sync doc comment]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alistair Francis 2014-08-29 15:00:29 +01:00 • committed by Peter Maydell
parent 87124fdea4
commit ec7b4ce4c7
2 changed files with 34 additions and 0 deletions
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11
target-arm/cpu.h
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@ -353,6 +353,17 @@ int cpu_arm_signal_handler(int host_signum, void *pinfo,
int arm_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int rw,
int mmu_idx);
/**
* pmccntr_sync
* @env: CPUARMState
*
* Synchronises the counter in the PMCCNTR. This must always be called twice,
* once before any action that might affect the timer and again afterwards.
* The function is used to swap the state of the register if required.
* This only happens when not in user mode (!CONFIG_USER_ONLY)
*/
void pmccntr_sync(CPUARMState *env);
/* SCTLR bit meanings. Several bits have been reused in newer
* versions of the architecture; in that case we define constants
* for both old and new bit meanings. Code which tests against those