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| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-07-26 10:41:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-26 11:35:16 -0700 |
| commit | f938d2c892db0d80d144253d4a7b7083efdbedeb (patch) | |
| tree | 1fbc946a9fb59827001a5d4d5224abe5e624e605 /drivers/lguest/switcher.S | |
| parent | dfb68689bf3e3d31dc9fb5c2bde5379a4ca9b0ec (diff) | |
| download | lwn-f938d2c892db0d80d144253d4a7b7083efdbedeb.tar.gz lwn-f938d2c892db0d80d144253d4a7b7083efdbedeb.zip | |
lguest: documentation I: Preparation
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>
Diffstat (limited to 'drivers/lguest/switcher.S')
| -rw-r--r-- | drivers/lguest/switcher.S | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/lguest/switcher.S b/drivers/lguest/switcher.S index eadd4cc299d2..e7cb8c123558 100644 --- a/drivers/lguest/switcher.S +++ b/drivers/lguest/switcher.S @@ -1,10 +1,11 @@ -/* This code sits at 0xFFC00000 to do the low-level guest<->host switch. +/*P:900 This is the Switcher: code which sits at 0xFFC00000 to do the low-level + * Guest<->Host switch. It is as simple as it can be made, but it's naturally + * very specific to x86. + * + * You have now completed Preparation. If this has whet your appetite; if you + * are feeling invigorated and refreshed then the next, more challenging stage + * can be found in "make Guest". :*/ - There is are two pages above us for this CPU (struct lguest_pages). - The second page (struct lguest_ro_state) becomes read-only after the - context switch. The first page (the stack for traps) remains writable, - but while we're in here, the guest cannot be running. -*/ #include <linux/linkage.h> #include <asm/asm-offsets.h> #include "lg.h" |