add machine state register support
PATCH 1/1 add machine state register support
This patch adds routines to get and set the machine state register. These are needed by power management code on some platforms.
--
Index:linux-2.6.11/arch/ppc/kernel/misc.S
===================================================================
--- linux-2.6.11.orig/arch/ppc/kernel/misc.S 2005-04-15 14:59:12.408518820 -0700
+++ linux-2.6.11/arch/ppc/kernel/misc.S 2005-04-15 14:59:34.005586781 -0700
@@ -1160,6 +1159,14 @@
addi r1,r1,16
blr
+_GLOBAL(_get_msr)
+ mfmsr r3
+ blr
+
+_GLOBAL(_set_msr)
+ mtmsr r3
+ blr
+
/*
* This routine is just here to keep GCC happy - sigh... */
Quoted 4 lines · Geoff Levand
This patch adds routines to get and set the machine state register. These are needed by power management code on some platforms.
Signed-off-by Geoff Levand <[email protected]> for CELF
Hi Geoff !
Can you tell me more about this power management code ? I tend to think that code that wants to do more than just using the existing accessors should be written in assembly...
Also, there is already
void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
That you can use for manipulating MSR bits.
Finally, I tend to prefer such small register accessors to be written as inline assembly in some headers. But then, I don't think you actually need to add anything here.
Regards,
Ben.
Quoted 16 lines · Benjamin Herrenschmidt
Quoted 4 lines · Geoff Levand
This patch adds routines to get and set the machine state register. These are needed by power management code on some platforms.
Signed-off-by Geoff Levand <[email protected]> for CELFHi Geoff !
Can you tell me more about this power management code ? I tend to think that code that wants to do more than just using the existing accessors should be written in assembly...
Also, there is already
Quoted 8 lines
void
_nmask_and_or_msr(unsigned long nmask, unsigned long or_val);That you can use for manipulating MSR bits.
Finally, I tend to prefer such small register accessors to be written as inline assembly in some headers. But then, I don't think you actually need to add anything here.
Sorry for the trouble, Geert is right, there are already mfmsr() and mtmsr() in <ppc-asm/reg.h>. I found get_msr in ppc64 and assumed they were missing for ppc. I should have looked more carefully.
-Geoff
Quoted 14 lines · Geoff Levand
This patch adds routines to get and set the machine state register. These are needed by power management code on some platforms.
Signed-off-by Geoff Levand <[email protected]> for CELF--
Index:linux-2.6.11/arch/ppc/kernel/misc.S
===================================================================arch/ppc/kernel/misc.S +0
-0@@ -1160,6 +1159,14 @@ addi r1,r1,16
arch/ppc/kernel/misc.S line 1169
Quoted 10 lines
arch/ppc/kernel/misc.S +8
-0blr +_GLOBAL(_get_msr) + mfmsr r3 + blr + +_GLOBAL(_set_msr) + mtmsr r3 + blr +
Please check m[ft]msr() in <asm/reg.h>.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds