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Re: [Qemu-devel] [PATCH] pci: add standard bridge device
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH] pci: add standard bridge device |
Date: |
Sun, 4 Sep 2011 18:24:09 +0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Sun, Sep 04, 2011 at 06:14:22PM +0300, Avi Kivity wrote:
> On 09/04/2011 05:54 PM, Michael S. Tsirkin wrote:
> >> Way too late. And also won't work, since often the offset is
> >> determined by one party and the size by another.
> >
> >For things like BARs, yes - but these don't need to be
> >that big normally. We could add an additinal API
> >that gets first/last parameters. last< first means 0 size.
> >Feasible?
>
> Let's defer this for now.
>
> Does PCI actually have 64-bit addresses?
Yes.
> Note that most/all cpus don't.
> We may need 65-bit arithmetic for that.
Jut using start/limit carefully should be enough ...
> >
> >> >VGA I/O addresses (including ISA aliases address - AD[15::10] are not
> >> >decoded):
> >> >AD[9::0] = 3B0h through 3BBh and 3C0h through 3DFh
> >>
> >> These "not decoded" bits mean you need to instantiate tons of
> >> aliases to implement correctly.
> >> I plan to add core support for that eventually.
> >
> >There's a flag to enable 16-bit decode actually:
> >bit 4 in bridge control register.
> >How does VGA work at the moment without a bridge? Ignores the ISA aliases?
> >then we can do that too I think.
> >
>
> Of course it doesn't ignore it. See the 440fx implementation, if
> you disable VGA access (via the SMRAM register), vga goes away.
Yes but that's for VGA RAM, right? I'm talking about the IO addresses:
are tons of aliases created as you suggest?
> (vga registers its legacy space as a subregion of pci_address_space(dev))
>
> --
> error compiling committee.c: too many arguments to function
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, (continued)
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/05
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Avi Kivity, 2011/09/04
- Re: [Qemu-devel] [PATCH] pci: add standard bridge device, Michael S. Tsirkin, 2011/09/04