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Minor tweaks to the TLB handling code - avoid movl instructions and add

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itc.x instructions to attempt to avoid the little flurry of TLB exceptions
for handling access, dirty etc.
This commit is contained in:
dfr 2001-11-27 09:49:53 +00:00
parent 6d4362392c
commit ed1267af93
2 changed files with 26 additions and 26 deletions
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26
sys/ia64/ia64/exception.S
View File

@ -125,9 +125,8 @@ interruption_Instruction_TLB:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -141,7 +140,8 @@ interruption_Instruction_TLB:
;;
mov pr=r17,0x1ffff // restore predicates
;;
rfi // walker will retry the access
itc.i r21 // and place in TLB
rfi
3: add r20=24,r20 // next in chain
;;
@ -201,9 +201,8 @@ interruption_Data_TLB:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -217,7 +216,8 @@ interruption_Data_TLB:
;;
mov pr=r17,0x1ffff // restore predicates
;;
rfi // walker will retry the access
itc.d r21 // and place in TLB
rfi
3: add r20=24,r20 // next in chain
;;
@ -336,9 +336,8 @@ interruption_Dirty_Bit:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -352,7 +351,8 @@ interruption_Dirty_Bit:
;;
mov pr=r17,0x1ffff // restore predicates
;;
rfi // walker will retry the access
itc.d r21 // and place in TLB
rfi
2: add r20=24,r20 // next in chain
;;
@ -405,9 +405,8 @@ interruption_Instruction_Access_Bit:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -421,6 +420,7 @@ interruption_Instruction_Access_Bit:
;;
mov pr=r17,0x1ffff // restore predicates
;;
itc.i r21 // and place in TLB
rfi // walker will retry the access
2: add r20=24,r20 // next in chain
@ -474,9 +474,8 @@ interruption_Data_Access_Bit:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -490,6 +489,7 @@ interruption_Data_Access_Bit:
;;
mov pr=r17,0x1ffff // restore predicates
;;
itc.d r21 // and place in TLB
rfi // walker will retry the access
2: add r20=24,r20 // next in chain

26
sys/ia64/ia64/exception.s
View File

@ -125,9 +125,8 @@ interruption_Instruction_TLB:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -141,7 +140,8 @@ interruption_Instruction_TLB:
;;
mov pr=r17,0x1ffff // restore predicates
;;
rfi // walker will retry the access
itc.i r21 // and place in TLB
rfi
3: add r20=24,r20 // next in chain
;;
@ -201,9 +201,8 @@ interruption_Data_TLB:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -217,7 +216,8 @@ interruption_Data_TLB:
;;
mov pr=r17,0x1ffff // restore predicates
;;
rfi // walker will retry the access
itc.d r21 // and place in TLB
rfi
3: add r20=24,r20 // next in chain
;;
@ -336,9 +336,8 @@ interruption_Dirty_Bit:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -352,7 +351,8 @@ interruption_Dirty_Bit:
;;
mov pr=r17,0x1ffff // restore predicates
;;
rfi // walker will retry the access
itc.d r21 // and place in TLB
rfi
2: add r20=24,r20 // next in chain
;;
@ -405,9 +405,8 @@ interruption_Instruction_Access_Bit:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -421,6 +420,7 @@ interruption_Instruction_Access_Bit:
;;
mov pr=r17,0x1ffff // restore predicates
;;
itc.i r21 // and place in TLB
rfi // walker will retry the access
2: add r20=24,r20 // next in chain
@ -474,9 +474,8 @@ interruption_Data_Access_Bit:
add r20=16,r18 // address of tag
;;
ld8.acq r23=[r20] // read old tag
movl r24=(1<<63) // ti bit
;;
or r23=r23,r24 // set ti bit
dep r23=-1,r23,63,1 // set ti bit
;;
st8.rel [r20]=r23 // store old tag + ti
;;
@ -490,6 +489,7 @@ interruption_Data_Access_Bit:
;;
mov pr=r17,0x1ffff // restore predicates
;;
itc.d r21 // and place in TLB
rfi // walker will retry the access
2: add r20=24,r20 // next in chain