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RE: [Xen-devel] Need help figuring out why my windows pv drivers wontwor

To: "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Need help figuring out why my windows pv drivers wontwork with a 32 bit dom0...
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Fri, 1 Feb 2008 15:52:55 +1100
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Thread-topic: [Xen-devel] Need help figuring out why my windows pv drivers wontwork with a 32 bit dom0...
> . Windows is padding structures differently under 32 and 64 bits.
> Strange that everything else works fine though...

I think I may be onto something with this...

32 bit Linux (using gcc and a quick .c file):
sizeof(uint8_t) = 1
sizeof(uint16_t) = 2
sizeof(uint32_t) = 4
sizeof(uint64_t) = 8
sizeof(struct blkif_request) = 108
sizeof(struct blkif_request_segment) = 8
sizeof(struct blkif_response) = 12

64 bit Linux (using gcc and a quick .c file):
sizeof(uint8_t) = 1
sizeof(uint16_t) = 2
sizeof(uint32_t) = 4
sizeof(uint64_t) = 8
sizeof(struct blkif_request) = 112
sizeof(struct blkif_request_segment) = 8
sizeof(struct blkif_response) = 16

32 bit Windows (using Microsoft DDK Compiler and debug statements in the
driver)
sizeof(uint8_t) = 1
sizeof(uint16_t) = 2
sizeof(uint32_t) = 4
sizeof(uint64_t) = 8
sizeof(struct blkif_request) = 112
sizeof(struct blkif_request_segment) = 8
sizeof(struct blkif_response) = 16

Haven't tried this test on 64 bit windows yet, but if 32 bit windows and
32 bit Linux align their structures differently, I can imagine that
problems are going to arise...

James


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