Re: [Qemu-devel] [PATCH v3 06/32] target-arm: make arm_current_pl() return PL3

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

On Wed, Jun 11, 2014 at 01:54:48AM +0200, Fabian Aggeler wrote:
> Make arm_current_pl() return PL3 for secure PL1 and monitor mode.
> Increase MMU modes since mmu_index is directly infered from arm_
> current_pl(). Changes assertion in arm_el_is_aa64() to allow EL3.
> 
> Signed-off-by: Fabian Aggeler <aggelerf@ethz.ch>
> ---
>  target-arm/cpu.h | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/target-arm/cpu.h b/target-arm/cpu.h
> index cb0da6b..14007a9 100644
> --- a/target-arm/cpu.h
> +++ b/target-arm/cpu.h
> @@ -100,7 +100,7 @@ typedef uint32_t ARMReadCPFunc(void *opaque, int cp_info,
>  
>  struct arm_boot_info;
>  
> -#define NB_MMU_MODES 2
> +#define NB_MMU_MODES 4

I guess this was unintentional here?


>  
>  /* We currently assume float and double are IEEE single and double
>     precision respectively.
> @@ -710,7 +710,6 @@ static inline int arm_feature(CPUARMState *env, int feature)
>      return (env->features & (1ULL << feature)) != 0;
>  }
>  
> -

This too.


>  /* Return true if exception level below EL3 is in secure state */
>  static inline bool arm_is_secure_below_el3(CPUARMState *env)
>  {
> @@ -751,11 +750,12 @@ static inline bool arm_is_secure(CPUARMState *env)
>  /* Return true if the specified exception level is running in AArch64 state. */
>  static inline bool arm_el_is_aa64(CPUARMState *env, int el)
>  {
> -    /* We don't currently support EL2 or EL3, and this isn't valid for EL0
> +    /* We don't currently support EL2, and this isn't valid for EL0
>       * (if we're in EL0, is_a64() is what you want, and if we're not in EL0
>       * then the state of EL0 isn't well defined.)
>       */
> -    assert(el == 1);
> +    assert(el == 1 || el == 3);
> +
>      /* AArch64-capable CPUs always run with EL1 in AArch64 mode. This
>       * is a QEMU-imposed simplification which we may wish to change later.
>       * If we in future support EL2 and/or EL3, then the state of lower
> @@ -947,9 +947,12 @@ static inline int arm_current_pl(CPUARMState *env)
>  
>      if ((env->uncached_cpsr & 0x1f) == ARM_CPU_MODE_USR) {
>          return 0;
> +    } else if (arm_is_secure(env)) {
> +        /* Secure PL1 and monitor mode are mapped to PL3 */
> +        return 3;
>      }
> -    /* We don't currently implement the Virtualization or TrustZone
> -     * extensions, so PL2 and PL3 don't exist for us.
> +    /* We currently do not implement the Virtualization extensions, so PL2 does
> +     * not exist for us.
>       */
>      return 1;
>  }
> -- 
> 1.8.3.2
>