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Re: [Qemu-devel] [PATCH 1/2] q35: implement SMRAM.D_LCK
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 1/2] q35: implement SMRAM.D_LCK |
Date: |
Tue, 14 Apr 2015 17:41:14 +0200 |
On Tue, Apr 14, 2015 at 03:12:39PM +0200, Gerd Hoffmann wrote:
> Signed-off-by: Gerd Hoffmann <address@hidden>
> ---
> hw/pci-host/q35.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> index 79bab15..9227489 100644
> --- a/hw/pci-host/q35.c
> +++ b/hw/pci-host/q35.c
> @@ -268,6 +268,20 @@ static void mch_update_smram(MCHPCIState *mch)
> PCIDevice *pd = PCI_DEVICE(mch);
> bool h_smrame = (pd->config[MCH_HOST_BRIDGE_ESMRAMC] &
> MCH_HOST_BRIDGE_ESMRAMC_H_SMRAME);
>
> + /* implement SMRAM.D_LCK */
> + if (pd->config[MCH_HOST_BRIDGE_SMRAM] & MCH_HOST_BRIDGE_SMRAM_D_LCK) {
> + pd->config[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_D_OPEN;
> +
> + pd->wmask[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_D_OPEN;
> + pd->wmask[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_D_LCK;
> + pd->wmask[MCH_HOST_BRIDGE_SMRAM] &= ~MCH_HOST_BRIDGE_SMRAM_G_SMRAME;
> + pd->wmask[MCH_HOST_BRIDGE_SMRAM] &=
> ~MCH_HOST_BRIDGE_SMRAM_C_BASE_SEG_MASK;
> +
> + pd->wmask[MCH_HOST_BRIDGE_ESMRAMC] &=
> ~MCH_HOST_BRIDGE_ESMRAMC_H_SMRAME;
> + pd->wmask[MCH_HOST_BRIDGE_ESMRAMC] &=
> ~MCH_HOST_BRIDGE_ESMRAMC_TSEG_SZ_MASK;
> + pd->wmask[MCH_HOST_BRIDGE_ESMRAMC] &= ~MCH_HOST_BRIDGE_ESMRAMC_T_EN;
I'd prefer a single statement:
pd->wmask[MCH_HOST_BRIDGE_SMRAM] &=
~(MCH_HOST_BRIDGE_SMRAM_D_OPEN | MCH_HOST_BRIDGE_SMRAM_D_LCK |
... )
> + }
> +
> memory_region_transaction_begin();
>
> if (pd->config[MCH_HOST_BRIDGE_SMRAM] & SMRAM_D_OPEN) {
> @@ -297,7 +311,6 @@ static void mch_write_config(PCIDevice *d,
> {
> MCHPCIState *mch = MCH_PCI_DEVICE(d);
>
> - /* XXX: implement SMRAM.D_LOCK */
> pci_default_write_config(d, address, val, len);
>
> if (ranges_overlap(address, len, MCH_HOST_BRIDGE_PAM0,
> @@ -351,6 +364,8 @@ static void mch_reset(DeviceState *qdev)
> MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT);
>
> d->config[MCH_HOST_BRIDGE_SMRAM] = MCH_HOST_BRIDGE_SMRAM_DEFAULT;
> + d->wmask[MCH_HOST_BRIDGE_SMRAM] = 0xff;
Is this right? I see a bunch of reserved bits etc there.
> + d->wmask[MCH_HOST_BRIDGE_ESMRAMC] = 0xff;
Doesn't this mean we need to reset this register now?
>
> mch_update(mch);
> }
Don't you also need to clear D_LCK?
> --
> 1.8.3.1