Re: [PATCH] target/ppc: Fix test on mmu_model in hreg_compute_hflags_value()

["Cédric Le Goater" <clg@kaod.org>]

On 1/24/22 09:16, Cédric Le Goater wrote:
> POWERPC_MMU_BOOKE is not a mask and should not be tested with a
> bitwise AND operator.
> 
> It went unnoticed because it only impacts the 601 CPU implementation
> for which we don't have a known firmware image.

I forgot to change that. There is one here :

   https://github.com/artyom-tarasenko/openfirmware

image :

   https://github.com/artyom-tarasenko/openfirmware/releases/download/40p-20190413/q40pofw-serial.rom

Thanks,

C.

> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>   target/ppc/helper_regs.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/target/ppc/helper_regs.c b/target/ppc/helper_regs.c
> index 7dca585dddeb..5b12cb03c961 100644
> --- a/target/ppc/helper_regs.c
> +++ b/target/ppc/helper_regs.c
> @@ -156,7 +156,8 @@ static uint32_t hreg_compute_hflags_value(CPUPPCState *env)
>        */
>       unsigned immu_idx, dmmu_idx;
>       dmmu_idx = msr & (1 << MSR_PR) ? 0 : 1;
> -    if (env->mmu_model & POWERPC_MMU_BOOKE) {
> +    if (env->mmu_model == POWERPC_MMU_BOOKE ||
> +        env->mmu_model == POWERPC_MMU_BOOKE206) {
>           dmmu_idx |= msr & (1 << MSR_GS) ? 4 : 0;
>           immu_idx = dmmu_idx;
>           immu_idx |= msr & (1 << MSR_IS) ? 2 : 0;
> @@ -237,7 +238,8 @@ int hreg_store_msr(CPUPPCState *env, target_ulong value, int alter_hv)
>           ((value >> MSR_DR) & 1) != msr_dr) {
>           cpu_interrupt_exittb(cs);
>       }
> -    if ((env->mmu_model & POWERPC_MMU_BOOKE) &&
> +    if ((env->mmu_model == POWERPC_MMU_BOOKE ||
> +         env->mmu_model == POWERPC_MMU_BOOKE206) &&
>           ((value >> MSR_GS) & 1) != msr_gs) {
>           cpu_interrupt_exittb(cs);
>       }
>