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You can see include/public/arch-x86/xen.h

/* Structural guest handles introduced in 0x00030201. */

#if __XEN_INTERFACE_VERSION__ >= 0x00030201

#define ___DEFINE_XEN_GUEST_HANDLE(name, type) \

typedef struct { type *p; } __guest_handle_ ## name

#else

#define ___DEFINE_XEN_GUEST_HANDLE(name, type) \

typedef type * __guest_handle_ ## name

#endif

#define __DEFINE_XEN_GUEST_HANDLE(name, type) \

___DEFINE_XEN_GUEST_HANDLE(name, type); \

___DEFINE_XEN_GUEST_HANDLE(const_##name, const type)

#define DEFINE_XEN_GUEST_HANDLE(name) __DEFINE_XEN_GUEST_HANDLE(name, name)

#define __XEN_GUEST_HANDLE(name) __guest_handle_ ## name

#define XEN_GUEST_HANDLE(name) __XEN_GUEST_HANDLE(name)

#define set_xen_guest_handle(hnd, val) do { (hnd).p = val; } while (0)

#ifdef __XEN_TOOLS__

#define get_xen_guest_handle(val, hnd) do { val = (hnd).p; } while (0)

#endif

But I do not know why they are in these forms. Maybe by doing this, compiler can do some sort of type checking during compiling to avoid unintended programming errors? I think some big people in the maillist can answer. J

Best Regards

Shan Haitao

From: 房海峰 [mailto:fanghaifeng@xxxxxxxxxx]
Sent: 2008年3月8日 11:02
To: Shan, Haitao
Cc: xen-devel
Subject: Re: RE: Re: RE: [Xen-devel] where is the location of definitionof"do_xen_version"?

thank you very much for your replying!

and can you tell why xen do it in this way?

and what is the "__guest_handle_ " ?

thanks again.

2008-03-08

房海峰

发件人： Shan, Haitao

发送时间： 2008-03-07 20:54:54

收件人： fanghaifeng@xxxxxxxxxx; xen-devel

抄送：

主题： RE: Re: RE: [Xen-devel] where is the location of definitionof"do_xen_version"?

Xen/common/kernel.c

#define DO(fn) long do_##fn

DO(xen_version) )(int cmd, XEN_GUEST_HANDLE(void) arg)

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 房海峰
Sent: 2008年3月7日 18:50
To: xen-devel
Subject: Fw: Re: RE: [Xen-devel] where is the location of definitionof"do_xen_version"?

2008-03-07

房海峰

发件人： 房海峰

发送时间： 2008-03-07 18:49:08

收件人： Zheng, Shaohui

抄送：

主题： Re: RE: [Xen-devel] where is the location of definition of"do_xen_version"?

thanks for you!

but the function you found is running in the user-space.

what i need is the function as a hypercall.

2008-03-07

房海峰

发件人： Zheng, Shaohui

发送时间： 2008-03-07 17:46:52

收件人： fanghaifeng@xxxxxxxxxx; xen-devel

抄送：

主题： RE: [Xen-devel] where is the location of definition of"do_xen_version"?

tools/libxc/xc_private.h

the start line is 88.

88 static inline int do_xen_version(int xc_handle, int cmd, void *dest)

89 {

90 DECLARE_HYPERCALL;

92 hypercall.op = __HYPERVISOR_xen_version;

93 hypercall.arg[0] = (unsigned long) cmd;

94 hypercall.arg[1] = (unsigned long) dest;

96 return do_xen_hypercall(xc_handle, &hypercall);

97 }

Ctags can help you find the definition a function.

Just run the following commands.

cd xen-src-dir

ctags -R

vim -t do_xen_version

then you got it.

Best Regards

Shaohui

________________________________________

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 房海峰

Sent: 2008年3月7日 17:46

To: xen-devel

Subject: [Xen-devel] where is the location of definition of "do_xen_version"?

hi, my friends:

Currently, i am studying the way of hypercall's implementation.

i have already known the flow of hypercall's execuation, and i decided to add a new hypercall into the Xen.

first, i want to know the detail of one hypercall function, for example, "do_xen_version", but i can not find

the location of definition of "do_xen_version". who can help me?

i have get some resualts as follows:

[root@vt-0 xen-3.1.0-src]# find ./ -name "*.*" | xargs grep "do_xen_version"

./xen/include/xen/hypercall.h:do_xen_version(

Binary file ./xen/common/built_in.o matches

Binary file ./xen/common/kernel.o matches

./xen/arch/x86/x86_32/entry.S: .long do_xen_version

./xen/arch/x86/x86_32/entry.S: .byte 2 /* do_xen_version */

Binary file ./xen/arch/x86/x86_32/built_in.o matches

Binary file ./xen/arch/x86/x86_32/entry.o matches

./xen/arch/x86/x86_64/entry.S: .quad do_xen_version

./xen/arch/x86/x86_64/entry.S: .byte 2 /* do_xen_version */

Binary file ./xen/arch/x86/built_in.o matches

Binary file ./xen/arch/x86/hvm/hvm.o matches

Binary file ./xen/arch/x86/hvm/built_in.o matches

./xen/arch/ia64/linux-xen/entry.S: data8 do_xen_version

./xen/arch/powerpc/powerpc64/hypercall_table.S: .quad do_xen_version

Binary file ./dist/install/boot/xen-syms-3.1.0 matches

./tools/libxc/xc_private.c: rc = do_xen_version(xc_handle, cmd, arg);

./tools/libxc/xc_private.h:static inline int do_xen_version(int xc_handle, int cmd, void *dest)

but the "do_xen_version" is not in those above.

thanks a lots.

www.ict.ac.cn

2008-03-07

________________________________________

房海峰

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RE: RE: Re: RE: [Xen-devel] where is the location of definitionof"do_xen_version"?