Re: [Xen-devel] Need help figuring out why my windows pv drivers wontwork with a 32 bit dom0...

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>]

James Harper, le Fri 01 Feb 2008 15:52:55 +1100, a écrit :
> > . 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...

Mmm, then we probably need to define windows-specific ABI types...

Samuel

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