Re: [Qemu-devel] [PATCH v2 3/7] target-arm: Add arm_ccnt_enabled function

[Peter Crosthwaite <peter.crosthwaite@xilinx.com>]

On Thu, Jun 26, 2014 at 9:28 PM, Peter Crosthwaite
<peter.crosthwaite@xilinx.com> wrote:
> On Thu, Jun 26, 2014 at 3:02 PM, Alistair Francis
> <alistair.francis@xilinx.com> wrote:
>> Include a helper function to determine if the CCNT counter
>> is enabled as well as the constants used to mask the pmccfiltr_el0
>> and c9_pmxevtyper registers.
>>
>> Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
>> ---
>>
>>  target-arm/helper.c |   40 ++++++++++++++++++++++++++++++++++++++++
>>  1 files changed, 40 insertions(+), 0 deletions(-)
>>
>> diff --git a/target-arm/helper.c b/target-arm/helper.c
>> index ce986ee..141e252 100644
>> --- a/target-arm/helper.c
>> +++ b/target-arm/helper.c
>> @@ -547,6 +547,46 @@ static CPAccessResult pmreg_access(CPUARMState *env, const ARMCPRegInfo *ri)
>>  }
>>
>>  #ifndef CONFIG_USER_ONLY
>
> Blank line here for readability.
>
>> +#define PMCCFILTR_NSH 0x8000000
>> +#define PMCCFILTR_P 0x80000000
>> +#define PMCCFILTR_U 0x40000000
>> +
>> +#define PMXEVTYPER_P 0x80000000
>> +#define PMXEVTYPER_U 0x40000000
>> +
>> +static bool arm_ccnt_enabled(CPUARMState *env)
>> +{
>> +    /* This does not support checking for the secure/non-secure
>> +     * components of the PMCCFILTR_EL0 register
>> +     */
>> +
>> +    if (!(env->cp15.c9_pmcr & PMCRE)) {
>> +        return 0;
>> +    }
>> +
>> +    if (arm_current_pl(env) == 2) {
>
> switch(arm_current_pl(env))
>
>> +        if (!(env->cp15.pmccfiltr_el0 & PMCCFILTR_NSH)) {
>> +            return 0;
>
> Use "true" and "false" for boolean function return values.
>
>> +        }
>> +    } else if (arm_current_pl(env) == 1) {
>> +        if (env->cp15.pmccfiltr_el0 & PMCCFILTR_P) {
>> +            return 0;
>> +        } else if (env->cp15.c9_pmxevtyper & PMXEVTYPER_P) {
>
> use an || to merge the two if branches with same function body.
>
>> +            return 0;
>> +        }
>> +    } else if (arm_current_pl(env) == 0) {
>> +        if (env->cp15.pmccfiltr_el0 & PMCCFILTR_U) {
>> +            return 0;
>> +        } else if (env->cp15.c9_pmxevtyper & PMXEVTYPER_U) {
>> +            return 0;
>> +        }
>> +    }
>> +
>> +    return 1;
>> +}
>> +#endif
>> +
>> +#ifndef CONFIG_USER_ONLY
>
> Just drop the extra #endif #ifndef CONFIG_USER_ONLY.
>

All fixed (in a respun version I got from Alistair).

Regards,
Peter

> Regards,
> Peter
>
>>  static void pmcr_write(CPUARMState *env, const ARMCPRegInfo *ri,
>>                         uint64_t value)
>>  {
>> --
>> 1.7.1
>>
>>