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

To: "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] A question related with symbol reference?
From: "房海峰" <fanghaifeng@xxxxxxxxxx>
Date: Tue, 18 Mar 2008 14:04:50 +0800
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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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