[Xen-devel] A question related with symbol reference?

["房海峰" <fanghaifeng@xxxxxxxxxx>]

hi, my friends:

 

recently, i am reading the source codes about hypercall.

 

First, i study a simple hypercall, for example, the "do_xen_version".

 

In "xen-3.1.0-src\xen\common\kernel.c", the definition of "do_xen_version" is:

 

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

{

....

}

 

according to the " #define DO(fn) long do_##fn ", the expanded form is "do_xen_version (...)".

 

then, in the "xen-3.1.0-src\xen\arch\x86\x86_32\entry.S", there is an item in the "hypercall_table", like this:

 

ENTRY(hypercall_table)

....

.long do_xen_version

....

 

 

as we all known, for a symbol reference of function there need to be a header file contained, or a "global" declaration.

 

By searching the header files, i found the file, "xen-3.1.0-src\xen\include\xen\hypercall.h" that declared the function in a form as follows:

 

extern long

do_xen_version(

int cmd,

XEN_GUEST_HANDLE(void) arg);

 

But, i can not find where the file "hypercall.h" is contained in order to link it with the reference of "do_xen_version" in the "entry.S"

 

So, please help me, or give me some advice.

 

thanks advance.

 

2008-03-18

---

房海峰

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