Re: [PATCH v4 2/2] target/m68k: consolidate physical translation offset into get_physical_address()

[Laurent Vivier]

Le 01/07/2020 à 22:15, Mark Cave-Ayland a écrit :
> Since all callers to get_physical_address() now apply the same page offset to
> the translation result, move the logic into get_physical_address() itself to
> avoid duplication.
> 
> Suggested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>  target/m68k/helper.c | 17 ++++++-----------
>  1 file changed, 6 insertions(+), 11 deletions(-)
> 
> diff --git a/target/m68k/helper.c b/target/m68k/helper.c
> index 631eab7774..3ff5765795 100644
> --- a/target/m68k/helper.c
> +++ b/target/m68k/helper.c
> @@ -643,7 +643,7 @@ static int get_physical_address(CPUM68KState *env, hwaddr 
> *physical,
>                  /* Transparent Translation Register bit */
>                  env->mmu.mmusr = M68K_MMU_T_040 | M68K_MMU_R_040;
>              }
> -            *physical = address & TARGET_PAGE_MASK;
> +            *physical = address;
>              *page_size = TARGET_PAGE_SIZE;
>              return 0;
>          }
> @@ -771,7 +771,7 @@ static int get_physical_address(CPUM68KState *env, hwaddr 
> *physical,
>      }
>      *page_size = 1 << page_bits;
>      page_mask = ~(*page_size - 1);
> -    *physical = next & page_mask;
> +    *physical = (next & page_mask) + (address & (*page_size - 1));
>  
>      if (access_type & ACCESS_PTEST) {
>          env->mmu.mmusr |= next & M68K_MMU_SR_MASK_040;
> @@ -826,8 +826,6 @@ hwaddr m68k_cpu_get_phys_page_debug(CPUState *cs, vaddr 
> addr)
>          return -1;
>      }
>  
> -    addr &= TARGET_PAGE_MASK;
> -    phys_addr += addr & (page_size - 1);
>      return phys_addr;
>  }
>  
> @@ -891,10 +889,8 @@ bool m68k_cpu_tlb_fill(CPUState *cs, vaddr address, int 
> size,
>      ret = get_physical_address(&cpu->env, &physical, &prot,
>                                 address, access_type, &page_size);
>      if (likely(ret == 0)) {
> -        address &= TARGET_PAGE_MASK;
> -        physical += address & (page_size - 1);
> -        tlb_set_page(cs, address, physical,
> -                     prot, mmu_idx, TARGET_PAGE_SIZE);
> +        tlb_set_page(cs, address & TARGET_PAGE_MASK,
> +                     physical & TARGET_PAGE_MASK, prot, mmu_idx, page_size);
>          return true;
>      }
>  
> @@ -1383,9 +1379,8 @@ void HELPER(ptest)(CPUM68KState *env, uint32_t addr, 
> uint32_t is_read)
>      ret = get_physical_address(env, &physical, &prot, addr,
>                                 access_type, &page_size);
>      if (ret == 0) {
> -        addr &= TARGET_PAGE_MASK;
> -        physical += addr & (page_size - 1);
> -        tlb_set_page(env_cpu(env), addr, physical,
> +        tlb_set_page(env_cpu(env), addr & TARGET_PAGE_MASK,
> +                     physical & TARGET_PAGE_MASK,
>                       prot, access_type & ACCESS_SUPER ?
>                       MMU_KERNEL_IDX : MMU_USER_IDX, page_size);
>      }
> 

Reviewed-by: Laurent Vivier <laurent@vivier.eu>