diff options
Diffstat (limited to 'drivers/lguest/x86/switcher_32.S')
-rw-r--r-- | drivers/lguest/x86/switcher_32.S | 22 |
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! |