[v2] hw/net/eepro100: Implement read-only bits in MDI registers

Although we defined an eepro100_mdi_mask[] array indicating which bits
in the registers are read-only, we weren't actually doing anything with
it. Make the MDI register-write code use it rather than manually making
register 1 read-only and leaving the rest as reads-as-written. (The
special-case handling of register 0 remains as before since its mask is
all-zeros and the special casing happens before we apply the masking.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1402159924-13853-1-git-send-email-peter.maydell@linaro.org
---
No code change, but I fixed the errors in the commit message.

 hw/net/eepro100.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Ping! Stefan, you said you were going to take this via the net queue?

thanks
-- PMM

On 9 June 2014 16:03, Peter Maydell <peter.maydell@linaro.org> wrote:
> Although we defined an eepro100_mdi_mask[] array indicating which bits
> in the registers are read-only, we weren't actually doing anything with
> it. Make the MDI register-write code use it rather than manually making
> register 1 read-only and leaving the rest as reads-as-written. (The
> special-case handling of register 0 remains as before since its mask is
> all-zeros and the special casing happens before we apply the masking.)
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> Message-id: 1402159924-13853-1-git-send-email-peter.maydell@linaro.org
> ---
> No code change, but I fixed the errors in the commit message.
>
>  hw/net/eepro100.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/hw/net/eepro100.c b/hw/net/eepro100.c
> index 3b891ca..9c70cce 100644
> --- a/hw/net/eepro100.c
> +++ b/hw/net/eepro100.c
> @@ -1217,7 +1217,6 @@ static void eepro100_write_mdi(EEPRO100State *s)
>                  break;
>              case 1:            /* Status Register */
>                  missing("not writable");
> -                data = s->mdimem[reg];
>                  break;
>              case 2:            /* PHY Identification Register (Word 1) */
>              case 3:            /* PHY Identification Register (Word 2) */
> @@ -1230,7 +1229,8 @@ static void eepro100_write_mdi(EEPRO100State *s)
>              default:
>                  missing("not implemented");
>              }
> -            s->mdimem[reg] = data;
> +            s->mdimem[reg] &= eepro100_mdi_mask[reg];
> +            s->mdimem[reg] |= data & ~eepro100_mdi_mask[reg];
>          } else if (opcode == 2) {
>              /* MDI read */
>              switch (reg) {
> --
> 1.9.2

On Mon, Jun 09, 2014 at 04:03:08PM +0100, Peter Maydell wrote:
> Although we defined an eepro100_mdi_mask[] array indicating which bits
> in the registers are read-only, we weren't actually doing anything with
> it. Make the MDI register-write code use it rather than manually making
> register 1 read-only and leaving the rest as reads-as-written. (The
> special-case handling of register 0 remains as before since its mask is
> all-zeros and the special casing happens before we apply the masking.)
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> Message-id: 1402159924-13853-1-git-send-email-peter.maydell@linaro.org
> ---
> No code change, but I fixed the errors in the commit message.
> 
>  hw/net/eepro100.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Thanks, applied to my net tree:
https://github.com/stefanha/qemu/commits/net

Stefan