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authorVineet Gupta <vgupta@synopsys.com>2015-10-05 15:41:36 +0530
committerVineet Gupta <vgupta@synopsys.com>2015-10-28 19:50:29 +0530
commit25d464183ca3522ae27ec1bbef5ddcbbbef65017 (patch)
tree1f97958475dfe76415160b61cd9e70dd6fc64c0d /arch/arc
parent28b4af729fc4f7ee748c4bccb50ba5a6066418eb (diff)
ARC: mm: PAE40: tlbex.S: Explicitify the size of pte_t
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/mm/tlbex.S21
1 files changed, 12 insertions, 9 deletions
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index 552594897655..8d1b81990bc1 100644
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -221,12 +221,15 @@ ex_saved_reg1:
; Get the PTE entry: The idea is
; (1) x = addr >> PAGE_SHIFT -> masks page-off bits from @fault-addr
; (2) y = x & (PTRS_PER_PTE - 1) -> to get index
- ; (3) z = pgtbl[y]
- ; To avoid the multiply by in end, we do the -2, <<2 below
+ ; (3) z = (pgtbl + y * 4)
- lsr r0, r2, (PAGE_SHIFT - 2)
- and r0, r0, ( (PTRS_PER_PTE - 1) << 2)
- ld.aw r0, [r1, r0] ; get PTE and PTE ptr for fault addr
+#define PTE_SIZE_LOG 2 /* 4 == 2 ^ 2 */
+
+ ; multiply in step (3) above avoided by shifting lesser in step (1)
+ lsr r0, r2, ( PAGE_SHIFT - PTE_SIZE_LOG )
+ and r0, r0, ( (PTRS_PER_PTE - 1) << PTE_SIZE_LOG )
+ ld.aw r0, [r1, r0] ; r0: PTE
+ ; r1: PTE ptr
2:
@@ -247,15 +250,15 @@ ex_saved_reg1:
; IN: r0 = PTE, r1 = ptr to PTE
.macro CONV_PTE_TO_TLB
- and r3, r0, PTE_BITS_RWX ; r w x
- lsl r2, r3, 3 ; r w x 0 0 0 (GLOBAL, kernel only)
+ and r3, r0, PTE_BITS_RWX ; r w x
+ lsl r2, r3, 3 ; Kr Kw Kx 0 0 0 (GLOBAL, kernel only)
and.f 0, r0, _PAGE_GLOBAL
- or.z r2, r2, r3 ; r w x r w x (!GLOBAL, user page)
+ or.z r2, r2, r3 ; Kr Kw Kx Ur Uw Ux (!GLOBAL, user page)
and r3, r0, PTE_BITS_NON_RWX_IN_PD1 ; Extract PFN+cache bits from PTE
or r3, r3, r2
- sr r3, [ARC_REG_TLBPD1] ; these go in PD1
+ sr r3, [ARC_REG_TLBPD1] ; paddr[31..13] | Kr Kw Kx Ur Uw Ux | C
and r2, r0, PTE_BITS_IN_PD0 ; Extract other PTE flags: (V)alid, (G)lb