RE: [Xen-devel] Re: X86_emulate to be moved into qemu...

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Keir Fraser
> Sent: 18 May 2006 14:15
> To: Petersson, Mats
> Cc: Xen devel list
> Subject: Re: [Xen-devel] Re: X86_emulate to be moved into qemu...
> 
> 
> On 18 May 2006, at 13:58, Petersson, Mats wrote:
> 
> > So, that would be a struct that could have the "struct 
> ioreq" field in 
> > it, which is optionally filled in depending on where it's 
> called from, 
> > for example?
> >
> > Yes, I agree with this.
> >
> > I'll work on something that uses this method, and I'll send you a 
> > patch before I go any further.
> 
> My model would be that any *extra* stuff you want to just 
> pass through to the callback functions, you'd do as follows (roughly):
> 
> /* This is a container for all emulation context. */ struct 
> mydevice_emulator_context {
>      /* The actual args structure for the emulator. */
>      struct x86_emulate args;
>      /* Extra handy stuff for this particular call site and 
> set of callback functions. */
>      struct ioreq *ioreq;
> };
> 
> /* This is a call to the emulator. */
> x86_emulate_memop(&context.args);
> 
> /* This is an example of how a callback func gets at the 
> caller-specific goodies. */ int emulate_read(..., struct 
> x86_emulate_memop *args) {
>      struct mydevice_emulator_context *context;
>      context = container_of(args, struct 
> mydevice_emulator_context, args);
>      ....
> }

Ok, I'm with you. 

Attached is a quick hack at getting a single argument to
x86_emulate_memop() and related changes. Comments please...

--
Mats
> 
> 
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> 
>

single_struct_arg.patch
Description: single_struct_arg.patch

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