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Re: [Xen-devel] Physical address mapping to user space in dom0 problem
| To: | "Keir Fraser" <keir@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Physical address mapping to user space in dom0 problem |
| From: | "Haw-Yuan Yang" <hawyuan@xxxxxxxxx> |
| Date: | Fri, 16 Mar 2007 17:36:42 -0700 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Fri, 16 Mar 2007 17:35:43 -0700 |
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It still not working. Here is what I did:
In driver I have an IOCTL option IO_DMA_ALLOC to allocate the DMA buffer by using pci_alloc_consistent() and return the allocated physical address to user space.
In user space testing program:
1. Call IOCTL IO_DMA_ALLOC to allocate a 64Kbyte DMA buffer. The physical address of the allocated buffer is 0x03bb0000.
2. Open /dev/mem and call mmap(0,64*1024,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x03bb0000) ;
the return of mmap is -1.
On 3/16/07, Keir Fraser <keir@xxxxxxxxxxxxx> wrote:
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