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-rw-r--r--drivers/lguest/x86/switcher_32.S22
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/lguest/x86/switcher_32.S b/drivers/lguest/x86/switcher_32.S
index 3fc15318a80f..40634b0db9f7 100644
--- a/drivers/lguest/x86/switcher_32.S
+++ b/drivers/lguest/x86/switcher_32.S
@@ -1,12 +1,15 @@
1/*P:900 This is the Switcher: code which sits at 0xFFC00000 astride both the 1/*P:900
2 * Host and Guest to do the low-level Guest<->Host switch. It is as simple as 2 * This is the Switcher: code which sits at 0xFFC00000 (or 0xFFE00000) astride
3 * it can be made, but it's naturally very specific to x86. 3 * both the Host and Guest to do the low-level Guest<->Host switch. It is as
4 * simple as it can be made, but it's naturally very specific to x86.
4 * 5 *
5 * You have now completed Preparation. If this has whet your appetite; if you 6 * You have now completed Preparation. If this has whet your appetite; if you
6 * are feeling invigorated and refreshed then the next, more challenging stage 7 * are feeling invigorated and refreshed then the next, more challenging stage
7 * can be found in "make Guest". :*/ 8 * can be found in "make Guest".
9 :*/
8 10
9/*M:012 Lguest is meant to be simple: my rule of thumb is that 1% more LOC must 11/*M:012
12 * Lguest is meant to be simple: my rule of thumb is that 1% more LOC must
10 * gain at least 1% more performance. Since neither LOC nor performance can be 13 * gain at least 1% more performance. Since neither LOC nor performance can be
11 * measured beforehand, it generally means implementing a feature then deciding 14 * measured beforehand, it generally means implementing a feature then deciding
12 * if it's worth it. And once it's implemented, who can say no? 15 * if it's worth it. And once it's implemented, who can say no?
@@ -31,11 +34,14 @@
31 * Host (which is actually really easy). 34 * Host (which is actually really easy).
32 * 35 *
33 * Two questions remain. Would the performance gain outweigh the complexity? 36 * Two questions remain. Would the performance gain outweigh the complexity?
34 * And who would write the verse documenting it? :*/ 37 * And who would write the verse documenting it?
38:*/
35 39
36/*M:011 Lguest64 handles NMI. This gave me NMI envy (until I looked at their 40/*M:011
41 * Lguest64 handles NMI. This gave me NMI envy (until I looked at their
37 * code). It's worth doing though, since it would let us use oprofile in the 42 * code). It's worth doing though, since it would let us use oprofile in the
38 * Host when a Guest is running. :*/ 43 * Host when a Guest is running.
44:*/
39 45
40/*S:100 46/*S:100
41 * Welcome to the Switcher itself! 47 * Welcome to the Switcher itself!