Lennart Sorensen wrote:
The problem is how to know what bar is accessing in case I have only one function for all BARs.On Tue, Oct 27, 2009 at 04:05:25PM +0100, Màrius Montón wrote:Màrius Montón wrote:Hello,For my PCI device to QEMU, I need the real address the PCI bus is using to access my device. For a IO BAR (PCI_ADDRESS_SPACE_IO), I receive the real address (like 0xc200 or similar), but when registering a PCI_ADDRESS_SPACE_MEM I only receive the offset to the BAR. How I can receive or obtaint the real address on each access to my device? Cjeers, Màriusnobody can tell me anything? :(Add the offset to the address in the bar? I know all PCI internals, but I don't understand why for IO I receive all address and only the offset for MEM BARs (or I'm wrong?)After all the OS is allowed to change your BAR if it wants to. So internally the only thing that makes sense to a PCI device is the offset from it's base address. You listen to addresses at your IO range, and at your memory BAR range. What you do when you see a request for your range then depends on the offset that address had from the current base. This would also be true for the IO. Màrius |
- [Qemu-devel] PCI address question Màrius Montón
- [Qemu-devel] Re: PCI address question Màrius Montón
- Re: [Qemu-devel] Re: PCI address question Lennart Sorensen
- Re: [Qemu-devel] Re: PCI address question Màrius Montón
- [Qemu-devel] Re: Re: PCI address quest... Michael S. Tsirkin
- [Qemu-devel] Re: PCI address ques... Màrius Montón