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Date: Fri, 02 Nov 2001 09:00:19 -0800
From: "Randy.Dunlap" <rddunlap@osdl.org>
Organization: OSDL
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To: "Yan, Noah" <noah.yan@intel.com>
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Subject: Re: vm documentation
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"Yan, Noah" wrote:
> 
> Is there any resources(such as programming guide or referrence book) for the C language grammar in gcc, especially for Kernel? Such as what is _init, 1<<12, asmlinkage, etc?
> 
> 
> From: Robert Love [mailto:rml@tech9.net]
> 
> See http://kernelnewbies.org for some introduction to kernel hacking...


Noah,
Lots of your questions are appropriate for kernelnewbies.org .

__init (with 2 underscores) is defined in the header file
  linux/include/linux/init.h
It marks a code (text) segment as being discardable after boot/init
for code that is not in a module (i.e., it is compiled into the
kernel boot image).

"1<<12" is C.  Take the value 1, shift it left 12 times (bits),
giving 0x1000.

~Randy
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