Re: [PATCH 01/43] target/ppc: Reorganise and rename ppc_hash32_pp_prot()

["Nicholas Piggin" <npiggin@gmail.com>]

On Mon May 27, 2024 at 9:12 AM AEST, BALATON Zoltan wrote:
> Reorganise ppc_hash32_pp_prot() swapping the if legs so it does not
> test for negative first and clean up to make it shorter. Also rename
> it to ppc_hash32_prot().

Rename makes sense since it's not entirely derived from pp but
also key and nx.

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

>
> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
> ---
>  target/ppc/mmu-hash32.c |  2 +-
>  target/ppc/mmu-hash32.h | 35 +++++++++++++----------------------
>  target/ppc/mmu_common.c |  2 +-
>  3 files changed, 15 insertions(+), 24 deletions(-)
>
> diff --git a/target/ppc/mmu-hash32.c b/target/ppc/mmu-hash32.c
> index d5f2057eb1..8a446c8a7d 100644
> --- a/target/ppc/mmu-hash32.c
> +++ b/target/ppc/mmu-hash32.c
> @@ -45,7 +45,7 @@ static int ppc_hash32_pte_prot(int mmu_idx,
>      key = !!(mmuidx_pr(mmu_idx) ? (sr & SR32_KP) : (sr & SR32_KS));
>      pp = pte.pte1 & HPTE32_R_PP;
>  
> -    return ppc_hash32_pp_prot(key, pp, !!(sr & SR32_NX));
> +    return ppc_hash32_prot(key, pp, !!(sr & SR32_NX));
>  }
>  
>  static target_ulong hash32_bat_size(int mmu_idx,
> diff --git a/target/ppc/mmu-hash32.h b/target/ppc/mmu-hash32.h
> index f0ce6951b4..bc4eedbecc 100644
> --- a/target/ppc/mmu-hash32.h
> +++ b/target/ppc/mmu-hash32.h
> @@ -102,49 +102,40 @@ static inline void ppc_hash32_store_hpte1(PowerPCCPU *cpu,
>      stl_phys(CPU(cpu)->as, base + pte_offset + HASH_PTE_SIZE_32 / 2, pte1);
>  }
>  
> -static inline int ppc_hash32_pp_prot(bool key, int pp, bool nx)
> +static inline int ppc_hash32_prot(bool key, int pp, bool nx)
>  {
>      int prot;
>  
> -    if (key == 0) {
> +    if (key) {
>          switch (pp) {
>          case 0x0:
> -        case 0x1:
> -        case 0x2:
> -            prot = PAGE_READ | PAGE_WRITE;
> +            prot = 0;
>              break;
> -
> +        case 0x1:
>          case 0x3:
>              prot = PAGE_READ;
>              break;
> -
> +        case 0x2:
> +            prot = PAGE_READ | PAGE_WRITE;
> +            break;
>          default:
> -            abort();
> +            g_assert_not_reached();
>          }
>      } else {
>          switch (pp) {
>          case 0x0:
> -            prot = 0;
> -            break;
> -
>          case 0x1:
> -        case 0x3:
> -            prot = PAGE_READ;
> -            break;
> -
>          case 0x2:
>              prot = PAGE_READ | PAGE_WRITE;
>              break;
> -
> +        case 0x3:
> +            prot = PAGE_READ;
> +            break;
>          default:
> -            abort();
> +            g_assert_not_reached();
>          }
>      }
> -    if (nx == 0) {
> -        prot |= PAGE_EXEC;
> -    }
> -
> -    return prot;
> +    return nx ? prot : prot | PAGE_EXEC;
>  }
>  
>  typedef struct {
> diff --git a/target/ppc/mmu_common.c b/target/ppc/mmu_common.c
> index e2542694f0..08c5b61f76 100644
> --- a/target/ppc/mmu_common.c
> +++ b/target/ppc/mmu_common.c
> @@ -120,7 +120,7 @@ static int ppc6xx_tlb_pte_check(mmu_ctx_t *ctx, target_ulong pte0,
>              }
>              /* Keep the matching PTE information */
>              ctx->raddr = pte1;
> -            ctx->prot = ppc_hash32_pp_prot(ctx->key, pp, ctx->nx);
> +            ctx->prot = ppc_hash32_prot(ctx->key, pp, ctx->nx);
>              if (check_prot_access_type(ctx->prot, access_type)) {
>                  /* Access granted */
>                  qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n");