| To: | Haw-Yuan Yang <hawyuan@xxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Physical address mapping to user space in dom0 problem |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | 2007年3月17日 07:57:03 +0000 |
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| Delivery-date: | 2007年3月17日 00:55:22 -0700 |
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| Thread-topic: | [Xen-devel] Physical address mapping to user space in dom0 problem |
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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.
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