forked from luck/tmp_suning_uos_patched
[SPARC64]: Simplify Spitfire D-cache page flush.
It tries to batch up the tag loads and comparisons, and then the stores. And this is just complicated instead of efficient. Also, make the symbol of the Cheetah version more grepable. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
80dc0d6b44
commit
c5bd50a953
|
@ -144,42 +144,29 @@ __flush_icache_page: /* %o0 = phys_page */
|
|||
|
||||
#define DTAG_MASK 0x3
|
||||
|
||||
/* This routine is Spitfire specific so the hardcoded
|
||||
* D-cache size and line-size are OK.
|
||||
*/
|
||||
.align 64
|
||||
.globl __flush_dcache_page
|
||||
__flush_dcache_page: /* %o0=kaddr, %o1=flush_icache */
|
||||
sethi %uhi(PAGE_OFFSET), %g1
|
||||
sllx %g1, 32, %g1
|
||||
sub %o0, %g1, %o0
|
||||
clr %o4
|
||||
srlx %o0, 11, %o0
|
||||
sethi %hi(1 << 14), %o2
|
||||
1: ldxa [%o4] ASI_DCACHE_TAG, %o3 ! LSU Group
|
||||
add %o4, (1 << 5), %o4 ! IEU0
|
||||
ldxa [%o4] ASI_DCACHE_TAG, %g1 ! LSU Group
|
||||
add %o4, (1 << 5), %o4 ! IEU0
|
||||
ldxa [%o4] ASI_DCACHE_TAG, %g2 ! LSU Group o3 available
|
||||
add %o4, (1 << 5), %o4 ! IEU0
|
||||
andn %o3, DTAG_MASK, %o3 ! IEU1
|
||||
ldxa [%o4] ASI_DCACHE_TAG, %g3 ! LSU Group
|
||||
add %o4, (1 << 5), %o4 ! IEU0
|
||||
andn %g1, DTAG_MASK, %g1 ! IEU1
|
||||
cmp %o0, %o3 ! IEU1 Group
|
||||
be,a,pn %xcc, dflush1 ! CTI
|
||||
sub %o4, (4 << 5), %o4 ! IEU0 (Group)
|
||||
cmp %o0, %g1 ! IEU1 Group
|
||||
andn %g2, DTAG_MASK, %g2 ! IEU0
|
||||
be,a,pn %xcc, dflush2 ! CTI
|
||||
sub %o4, (3 << 5), %o4 ! IEU0 (Group)
|
||||
cmp %o0, %g2 ! IEU1 Group
|
||||
andn %g3, DTAG_MASK, %g3 ! IEU0
|
||||
be,a,pn %xcc, dflush3 ! CTI
|
||||
sub %o4, (2 << 5), %o4 ! IEU0 (Group)
|
||||
cmp %o0, %g3 ! IEU1 Group
|
||||
be,a,pn %xcc, dflush4 ! CTI
|
||||
sub %o4, (1 << 5), %o4 ! IEU0
|
||||
2: cmp %o4, %o2 ! IEU1 Group
|
||||
bne,pt %xcc, 1b ! CTI
|
||||
nop ! IEU0
|
||||
sub %o0, %g1, %o0 ! physical address
|
||||
srlx %o0, 11, %o0 ! make D-cache TAG
|
||||
sethi %hi(1 << 14), %o2 ! D-cache size
|
||||
sub %o2, (1 << 5), %o2 ! D-cache line size
|
||||
1: ldxa [%o2] ASI_DCACHE_TAG, %o3 ! load D-cache TAG
|
||||
andcc %o3, DTAG_MASK, %g0 ! Valid?
|
||||
be,pn %xcc, 2f ! Nope, branch
|
||||
andn %o3, DTAG_MASK, %o3 ! Clear valid bits
|
||||
cmp %o3, %o0 ! TAG match?
|
||||
bne,pt %xcc, 2f ! Nope, branch
|
||||
nop
|
||||
stxa %g0, [%o2] ASI_DCACHE_TAG ! Invalidate TAG
|
||||
membar #Sync
|
||||
2: brnz,pt %o2, 1b
|
||||
sub %o2, (1 << 5), %o2 ! D-cache line size
|
||||
|
||||
/* The I-cache does not snoop local stores so we
|
||||
* better flush that too when necessary.
|
||||
|
@ -189,20 +176,10 @@ __flush_dcache_page: /* %o0=kaddr, %o1=flush_icache */
|
|||
retl
|
||||
nop
|
||||
|
||||
dflush1:stxa %g0, [%o4] ASI_DCACHE_TAG
|
||||
add %o4, (1 << 5), %o4
|
||||
dflush2:stxa %g0, [%o4] ASI_DCACHE_TAG
|
||||
add %o4, (1 << 5), %o4
|
||||
dflush3:stxa %g0, [%o4] ASI_DCACHE_TAG
|
||||
add %o4, (1 << 5), %o4
|
||||
dflush4:stxa %g0, [%o4] ASI_DCACHE_TAG
|
||||
add %o4, (1 << 5), %o4
|
||||
membar #Sync
|
||||
ba,pt %xcc, 2b
|
||||
nop
|
||||
#endif /* DCACHE_ALIASING_POSSIBLE */
|
||||
|
||||
.previous .text
|
||||
.previous
|
||||
|
||||
.align 32
|
||||
__prefill_dtlb:
|
||||
rdpr %pstate, %g7
|
||||
|
@ -283,7 +260,7 @@ __cheetah_flush_tlb_pending: /* 26 insns */
|
|||
wrpr %g7, 0x0, %pstate
|
||||
|
||||
#ifdef DCACHE_ALIASING_POSSIBLE
|
||||
flush_dcpage_cheetah: /* 11 insns */
|
||||
__cheetah_flush_dcache_page: /* 11 insns */
|
||||
sethi %uhi(PAGE_OFFSET), %g1
|
||||
sllx %g1, 32, %g1
|
||||
sub %o0, %g1, %o0
|
||||
|
@ -329,8 +306,8 @@ cheetah_patch_cachetlbops:
|
|||
#ifdef DCACHE_ALIASING_POSSIBLE
|
||||
sethi %hi(__flush_dcache_page), %o0
|
||||
or %o0, %lo(__flush_dcache_page), %o0
|
||||
sethi %hi(flush_dcpage_cheetah), %o1
|
||||
or %o1, %lo(flush_dcpage_cheetah), %o1
|
||||
sethi %hi(__cheetah_flush_dcache_page), %o1
|
||||
or %o1, %lo(__cheetah_flush_dcache_page), %o1
|
||||
call cheetah_patch_one
|
||||
mov 11, %o2
|
||||
#endif /* DCACHE_ALIASING_POSSIBLE */
|
||||
|
|
Loading…
Reference in New Issue
Block a user