[v2,10/28] target/ppc/mmu_common.c: Introduce mmu6xx_get_physical_address()

Repurpose get_segment_6xx_tlb() to do the whole address translation
for POWERPC_MMU_SOFT_6xx MMU model by moving the BAT check there and
renaming it to match other similar functions. These are only called
once together so no need to keep these separate functions and
combining them simplifies the caller allowing further restructuring.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 target/ppc/mmu_common.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

On Thu May 2, 2024 at 9:43 AM AEST, BALATON Zoltan wrote:
> Repurpose get_segment_6xx_tlb() to do the whole address translation
> for POWERPC_MMU_SOFT_6xx MMU model by moving the BAT check there and
> renaming it to match other similar functions. These are only called
> once together so no need to keep these separate functions and
> combining them simplifies the caller allowing further restructuring.

Looks good...

>
> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
> ---
>  target/ppc/mmu_common.c | 32 ++++++++++++++++----------------
>  1 file changed, 16 insertions(+), 16 deletions(-)
>
> diff --git a/target/ppc/mmu_common.c b/target/ppc/mmu_common.c
> index 98730035b1..ef1669b01d 100644
> --- a/target/ppc/mmu_common.c
> +++ b/target/ppc/mmu_common.c
> @@ -359,19 +359,25 @@ static int get_bat_6xx_tlb(CPUPPCState *env, mmu_ctx_t *ctx,
>      return ret;
>  }
>  
> -/* Perform segment based translation */
> -static int get_segment_6xx_tlb(CPUPPCState *env, mmu_ctx_t *ctx,
> -                               target_ulong eaddr, MMUAccessType access_type,
> -                               int type)
> +static int mmu6xx_get_physical_address(CPUPPCState *env, mmu_ctx_t *ctx,
> +                                       target_ulong eaddr,
> +                                       MMUAccessType access_type, int type)
>  {
>      PowerPCCPU *cpu = env_archcpu(env);
>      hwaddr hash;
> -    target_ulong vsid;
> -    int ds, target_page_bits;
> +    target_ulong vsid, sr, pgidx;
>      bool pr;
> -    int ret;
> -    target_ulong sr, pgidx;
> +    int ds, target_page_bits, ret = -1;
>  
> +    /* First try to find a BAT entry if there are any */
> +    if (env->nb_BATs != 0) {
> +        ret = get_bat_6xx_tlb(env, ctx, eaddr, access_type);
> +    }
> +    if (ret >= 0) {
> +        return ret;
> +    }

Would you consider not doing any rearranging of local variables there
and change this as:

    /* First try to find a BAT entry if there are any */
    if (env->nb_BATs != 0) {
        int ret = get_bat_6xx_tlb(env, ctx, eaddr, access_type);
        if (ret >= 0) {
            return ret;
        }
    }

Otherwise,

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

> +    /* Perform segment based translation when no BATs matched */
>      pr = FIELD_EX64(env->msr, MSR, PR);
>      ctx->eaddr = eaddr;
>  
> @@ -1193,14 +1199,8 @@ int get_physical_address_wtlb(CPUPPCState *env, mmu_ctx_t *ctx,
>          if (real_mode) {
>              ret = check_physical(env, ctx, eaddr, access_type);
>          } else {
> -            /* Try to find a BAT */
> -            if (env->nb_BATs != 0) {
> -                ret = get_bat_6xx_tlb(env, ctx, eaddr, access_type);
> -            }
> -            if (ret < 0) {
> -                /* We didn't match any BAT entry or don't have BATs */
> -                ret = get_segment_6xx_tlb(env, ctx, eaddr, access_type, type);
> -            }
> +            ret = mmu6xx_get_physical_address(env, ctx, eaddr, access_type,
> +                                              type);
>          }
>          break;
>