Author: jhibbits
Date: Sat Mar 2 20:59:18 2019
New Revision: 344729
URL: https://svnweb.freebsd.org/changeset/base/344729
Log:
powerpc/booke: Depessimize MAS register updates even more
Remove isyncs between MAS register updates in the TLB miss handler, since
it's only needed before the TLB update instructions.
Modified:
head/sys/powerpc/booke/locore.S
head/sys/powerpc/booke/trap_subr.S
Modified: head/sys/powerpc/booke/locore.S
==============================================================================
--- head/sys/powerpc/booke/locore.S Sat Mar 2 20:58:51 2019
(r344728)
+++ head/sys/powerpc/booke/locore.S Sat Mar 2 20:59:18 2019
(r344729)
@@ -252,6 +252,7 @@ __start:
isync
bl zero_mas7
bl zero_mas8
+ isync
tlbwe
isync
msync
@@ -505,6 +506,7 @@ bp_kernload:
isync
bl zero_mas7
bl zero_mas8
+ isync
tlbwe
isync
msync
@@ -695,6 +697,7 @@ tlb1_temp_mapping_as1:
bl zero_mas7
bl zero_mas8
mtlr %r3
+ isync
tlbwe
isync
msync
@@ -742,7 +745,6 @@ zero_mas7:
li %r20, 0
mtspr SPR_MAS7, %r20
- isync
1:
blr
@@ -759,7 +761,6 @@ zero_mas8:
1:
li %r20, 0
mtspr SPR_MAS8, %r20
- isync
blr
#endif
Modified: head/sys/powerpc/booke/trap_subr.S
==============================================================================
--- head/sys/powerpc/booke/trap_subr.S Sat Mar 2 20:58:51 2019
(r344728)
+++ head/sys/powerpc/booke/trap_subr.S Sat Mar 2 20:59:18 2019
(r344729)
@@ -761,17 +761,14 @@ search_failed:
/* Load MAS registers. */
mtspr SPR_MAS0, %r29
- isync
mtspr SPR_MAS1, %r28
- isync
mtspr SPR_MAS2, %r27
- isync
mtspr SPR_MAS3, %r23
- isync
bl zero_mas7
bl zero_mas8
+ isync
tlbwe
msync
isync
@@ -906,20 +903,16 @@ tlb_fill_entry:
/* Load MAS registers. */
mtspr SPR_MAS0, %r29
- isync
mtspr SPR_MAS1, %r28
- isync
mtspr SPR_MAS2, %r27
- isync
mtspr SPR_MAS3, %r22
- isync
mtspr SPR_MAS7, %r23
- isync
mflr %r21
bl zero_mas8
mtlr %r21
+ isync
tlbwe
isync
msync
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