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[SPARC64]: More TLB/TSB handling fixes.

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The SUN4V convention with non-shared TSBs is that the context
bit of the TAG is clear.  So we have to choose an "invalid"
bit and initialize new TSBs appropriately.  Otherwise a zero
TAG looks "valid".

Make sure, for the window fixup cases, that we use the right
global registers and that we don't potentially trample on
the live global registers in etrap/rtrap handling (%g2 and
%g6) and that we put the missing virtual address properly
in %g5.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-02-17 18:01:02 -08:00
parent 7adb37fe80
commit 8b23427441
9 changed files with 78 additions and 57 deletions
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14
arch/sparc64/kernel/ktlb.S
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@@ -52,8 +52,10 @@ kvmap_itlb_vmalloc_addr:
/* Load and check PTE. */
ldxa [%g5] ASI_PHYS_USE_EC, %g5
mov 1, %g7
sllx %g7, TSB_TAG_INVALID_BIT, %g7
brgez,a,pn %g5, kvmap_itlb_longpath
KTSB_STORE(%g1, %g0)
KTSB_STORE(%g1, %g7)
KTSB_WRITE(%g1, %g5, %g6)
@@ -146,8 +148,10 @@ kvmap_dtlb_vmalloc_addr:
/* Load and check PTE. */
ldxa [%g5] ASI_PHYS_USE_EC, %g5
mov 1, %g7
sllx %g7, TSB_TAG_INVALID_BIT, %g7
brgez,a,pn %g5, kvmap_dtlb_longpath
KTSB_STORE(%g1, %g0)
KTSB_STORE(%g1, %g7)
KTSB_WRITE(%g1, %g5, %g6)
@@ -215,8 +219,8 @@ kvmap_dtlb_longpath:
wrpr %g5, PSTATE_AG | PSTATE_MG, %pstate
.section .sun4v_2insn_patch, "ax"
.word 661b
nop
nop
SET_GL(1)
ldxa [%g0] ASI_SCRATCHPAD, %g5
.previous
rdpr %tl, %g3
@@ -226,7 +230,7 @@ kvmap_dtlb_longpath:
ldxa [%g4] ASI_DMMU, %g5
.section .sun4v_2insn_patch, "ax"
.word 661b
mov %g4, %g5
ldx [%g5 + HV_FAULT_D_ADDR_OFFSET], %g5
nop
.previous