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lguest: documentation I: Preparation

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The netfilter code had very good documentation: the Netfilter Hacking HOWTO.
Noone ever read it.

So this time I'm trying something different, using a bit of Knuthiness.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell
2007-07-26 10:41:02 -07:00
committed by Linus Torvalds
parent dfb68689bf
commit f938d2c892
14 changed files with 218 additions and 19 deletions
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11
drivers/lguest/segments.c
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@@ -1,3 +1,14 @@
/*P:600 The x86 architecture has segments, which involve a table of descriptors
* which can be used to do funky things with virtual address interpretation.
* We originally used to use segments so the Guest couldn't alter the
* Guest<->Host Switcher, and then we had to trim Guest segments, and restore
* for userspace per-thread segments, but trim again for on userspace->kernel
* transitions... This nightmarish creation was contained within this file,
* where we knew not to tread without heavy armament and a change of underwear.
*
* In these modern times, the segment handling code consists of simple sanity
* checks, and the worst you'll experience reading this code is butterfly-rash
* from frolicking through its parklike serenity. :*/
#include "lg.h"
static int desc_ok(const struct desc_struct *gdt)