diff mbox series

[PULL,v1,27/38] target-microblaze: mmu: Add a configurable output address mask

Message ID 20180529105011.1914-28-edgar.iglesias@gmail.com
State New
Headers show
Series Xilinx queue | expand

Commit Message

Edgar E. Iglesias May 29, 2018, 10:50 a.m. UTC 
From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Add a configurable output address mask, used to mimic the
configurable physical address bit width.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 target/microblaze/cpu.c | 1 +
 target/microblaze/mmu.c | 1 +
 target/microblaze/mmu.h | 1 +
 3 files changed, 3 insertions(+)

Comments

Peter Maydell June 4, 2018, 1:15 p.m. UTC | #1 
On 29 May 2018 at 11:50, Edgar E. Iglesias <edgar.iglesias@gmail.com> wrote:
> From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>
>
> Add a configurable output address mask, used to mimic the
> configurable physical address bit width.
>
> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
> ---
>  target/microblaze/cpu.c | 1 +
>  target/microblaze/mmu.c | 1 +
>  target/microblaze/mmu.h | 1 +
>  3 files changed, 3 insertions(+)
>
> diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
> index 6ee15ac800..71fc8d09fe 100644
> --- a/target/microblaze/cpu.c
> +++ b/target/microblaze/cpu.c
> @@ -128,6 +128,7 @@ static void mb_cpu_reset(CPUState *s)
>      env->mmu.c_mmu = 3;
>      env->mmu.c_mmu_tlb_access = 3;
>      env->mmu.c_mmu_zones = 16;
> +    env->mmu.c_addr_mask = MAKE_64BIT_MASK(0, cpu->cfg.addr_size);
>  #endif
>  }
>
> diff --git a/target/microblaze/mmu.c b/target/microblaze/mmu.c
> index a379968618..166c79908c 100644
> --- a/target/microblaze/mmu.c
> +++ b/target/microblaze/mmu.c
> @@ -164,6 +164,7 @@ unsigned int mmu_translate(struct microblaze_mmu *mmu,
>              tlb_rpn = d & TLB_RPN_MASK;
>
>              lu->vaddr = tlb_tag;
> +            lu->paddr = tlb_rpn & mmu->c_addr_mask;
>              lu->paddr = tlb_rpn;
>              lu->size = tlb_size;
>              lu->err = ERR_HIT;

Coverity points out (CID 1391441) that the line added here
has no effect, because we immediately overwrite lu->paddr in
the following line. What was the intention here ?

thanks
-- PMM
Edgar Iglesias June 5, 2018, 5:42 p.m. UTC | #2 
Hi,

Sorry for top post. This was my fuck up. The second assignment should go away. I'll send out a fix later.

Thanks,
Edgar


---
Sent from my phone


-------- Original Message --------
Subject: Re: [PULL v1 27/38] target-microblaze: mmu: Add a configurable output address mask
From: Peter Maydell <peter.maydell@linaro.org>
Date: Jun 4, 2018, 20:15
To: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
On 29 May 2018 at 11:50, Edgar E. Iglesias <edgar.iglesias@gmail.com> wrote:
> From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>
>
> Add a configurable output address mask, used to mimic the
> configurable physical address bit width.
>
> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
> ---
>  target/microblaze/cpu.c | 1 +
>  target/microblaze/mmu.c | 1 +
>  target/microblaze/mmu.h | 1 +
>  3 files changed, 3 insertions(+)
>
> diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
> index 6ee15ac800..71fc8d09fe 100644
> --- a/target/microblaze/cpu.c
> +++ b/target/microblaze/cpu.c
> @@ -128,6 +128,7 @@ static void mb_cpu_reset(CPUState *s)
>      env->mmu.c_mmu = 3;
>      env->mmu.c_mmu_tlb_access = 3;
>      env->mmu.c_mmu_zones = 16;
> +    env->mmu.c_addr_mask = MAKE_64BIT_MASK(0, cpu->cfg.addr_size);
>  #endif
>  }
>
> diff --git a/target/microblaze/mmu.c b/target/microblaze/mmu.c
> index a379968618..166c79908c 100644
> --- a/target/microblaze/mmu.c
> +++ b/target/microblaze/mmu.c
> @@ -164,6 +164,7 @@ unsigned int mmu_translate(struct microblaze_mmu *mmu,
>              tlb_rpn = d & TLB_RPN_MASK;
>
>              lu->vaddr = tlb_tag;
> +            lu->paddr = tlb_rpn & mmu->c_addr_mask;
>              lu->paddr = tlb_rpn;
>              lu->size = tlb_size;
>              lu->err = ERR_HIT;

Coverity points out (CID 1391441) that the line added here
has no effect, because we immediately overwrite lu->paddr in
the following line. What was the intention here ?

thanks
-- PMM
diff mbox series

Patch

diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
index 6ee15ac800..71fc8d09fe 100644
--- a/target/microblaze/cpu.c
+++ b/target/microblaze/cpu.c
@@ -128,6 +128,7 @@  static void mb_cpu_reset(CPUState *s)
     env->mmu.c_mmu = 3;
     env->mmu.c_mmu_tlb_access = 3;
     env->mmu.c_mmu_zones = 16;
+    env->mmu.c_addr_mask = MAKE_64BIT_MASK(0, cpu->cfg.addr_size);
 #endif
 }
 
diff --git a/target/microblaze/mmu.c b/target/microblaze/mmu.c
index a379968618..166c79908c 100644
--- a/target/microblaze/mmu.c
+++ b/target/microblaze/mmu.c
@@ -164,6 +164,7 @@  unsigned int mmu_translate(struct microblaze_mmu *mmu,
             tlb_rpn = d & TLB_RPN_MASK;
 
             lu->vaddr = tlb_tag;
+            lu->paddr = tlb_rpn & mmu->c_addr_mask;
             lu->paddr = tlb_rpn;
             lu->size = tlb_size;
             lu->err = ERR_HIT;
diff --git a/target/microblaze/mmu.h b/target/microblaze/mmu.h
index 1714caf82e..9fbdf38f36 100644
--- a/target/microblaze/mmu.h
+++ b/target/microblaze/mmu.h
@@ -72,6 +72,7 @@  struct microblaze_mmu
     int c_mmu;
     int c_mmu_tlb_access;
     int c_mmu_zones;
+    uint64_t c_addr_mask; /* Mask to apply to physical addresses.  */
 };
 
 struct microblaze_mmu_lookup