RE: [Xen-devel] confusion about the meaning of CONFIG_XEN

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

CONFIG_XEN is defined when building a PV kernel, and undefined when building PV 
drivers for an 'unmodified' (non-PV) kernel.

Platform-pci is a device driver which interfaces with xen on a non-PV kernel, 
via a virtual PCI device provided by qemu.

James

-----Original Message-----
From: "Zang Hongyong"<zanghongyong@xxxxxxxxxx>
Sent: 7/07/08 5:59:14 PM
To: "xen-devel"<xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] confusion about the meaning of CONFIG_XEN

hi all,
  I noticed "CONFIG_XEN" appears many times in Xen source code. I'm confused 
about the meaning of "CONFIG_XEN".
  For example, 
    in "gnttab.c", the definations of gnttab_map() and gnttab_resume() vary 
with "ifdef CONFIG_XEN" or not.
    And I also noticed ifndef CONFIG_XEN , the file <platform-pci.h> is 
included.

  So my questions are
  1)What's the meanning of CONFIG_XEN?  and on which kind of conditions, 
CONFIG_XEN should not be defined?
  2)What is platform-pci for?

  Any advice would be welcome.

Thanks in advance.   

Zang Hongyong
zanghongyong@xxxxxxxxxx
2008-07-07


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