aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc/kernel/ktlb.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel/ktlb.S')
-rw-r--r--arch/sparc/kernel/ktlb.S108
1 files changed, 9 insertions, 99 deletions
diff --git a/arch/sparc/kernel/ktlb.S b/arch/sparc/kernel/ktlb.S
index 605d49204580..94a1e6648bd0 100644
--- a/arch/sparc/kernel/ktlb.S
+++ b/arch/sparc/kernel/ktlb.S
@@ -47,14 +47,6 @@ kvmap_itlb_vmalloc_addr:
KERN_PGTABLE_WALK(%g4, %g5, %g2, kvmap_itlb_longpath)
TSB_LOCK_TAG(%g1, %g2, %g7)
-
- /* 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
- TSB_STORE(%g1, %g7)
-
TSB_WRITE(%g1, %g5, %g6)
/* fallthrough to TLB load */
@@ -118,6 +110,12 @@ kvmap_dtlb_obp:
ba,pt %xcc, kvmap_dtlb_load
nop
+kvmap_linear_early:
+ sethi %hi(kern_linear_pte_xor), %g7
+ ldx [%g7 + %lo(kern_linear_pte_xor)], %g2
+ ba,pt %xcc, kvmap_dtlb_tsb4m_load
+ xor %g2, %g4, %g5
+
.align 32
kvmap_dtlb_tsb4m_load:
TSB_LOCK_TAG(%g1, %g2, %g7)
@@ -146,105 +144,17 @@ kvmap_dtlb_4v:
/* Correct TAG_TARGET is already in %g6, check 4mb TSB. */
KERN_TSB4M_LOOKUP_TL1(%g6, %g5, %g1, %g2, %g3, kvmap_dtlb_load)
#endif
- /* TSB entry address left in %g1, lookup linear PTE.
- * Must preserve %g1 and %g6 (TAG).
- */
-kvmap_dtlb_tsb4m_miss:
- /* Clear the PAGE_OFFSET top virtual bits, shift
- * down to get PFN, and make sure PFN is in range.
- */
-661: sllx %g4, 0, %g5
- .section .page_offset_shift_patch, "ax"
- .word 661b
- .previous
-
- /* Check to see if we know about valid memory at the 4MB
- * chunk this physical address will reside within.
+ /* Linear mapping TSB lookup failed. Fallthrough to kernel
+ * page table based lookup.
*/
-661: srlx %g5, MAX_PHYS_ADDRESS_BITS, %g2
- .section .page_offset_shift_patch, "ax"
- .word 661b
- .previous
-
- brnz,pn %g2, kvmap_dtlb_longpath
- nop
-
- /* This unconditional branch and delay-slot nop gets patched
- * by the sethi sequence once the bitmap is properly setup.
- */
- .globl valid_addr_bitmap_insn
-valid_addr_bitmap_insn:
- ba,pt %xcc, 2f
- nop
- .subsection 2
- .globl valid_addr_bitmap_patch
-valid_addr_bitmap_patch:
- sethi %hi(sparc64_valid_addr_bitmap), %g7
- or %g7, %lo(sparc64_valid_addr_bitmap), %g7
- .previous
-
-661: srlx %g5, ILOG2_4MB, %g2
- .section .page_offset_shift_patch, "ax"
- .word 661b
- .previous
-
- srlx %g2, 6, %g5
- and %g2, 63, %g2
- sllx %g5, 3, %g5
- ldx [%g7 + %g5], %g5
- mov 1, %g7
- sllx %g7, %g2, %g7
- andcc %g5, %g7, %g0
- be,pn %xcc, kvmap_dtlb_longpath
-
-2: sethi %hi(kpte_linear_bitmap), %g2
-
- /* Get the 256MB physical address index. */
-661: sllx %g4, 0, %g5
- .section .page_offset_shift_patch, "ax"
- .word 661b
- .previous
-
- or %g2, %lo(kpte_linear_bitmap), %g2
-
-661: srlx %g5, ILOG2_256MB, %g5
- .section .page_offset_shift_patch, "ax"
- .word 661b
- .previous
-
- and %g5, (32 - 1), %g7
-
- /* Divide by 32 to get the offset into the bitmask. */
- srlx %g5, 5, %g5
- add %g7, %g7, %g7
- sllx %g5, 3, %g5
-
- /* kern_linear_pte_xor[(mask >> shift) & 3)] */
- ldx [%g2 + %g5], %g2
- srlx %g2, %g7, %g7
- sethi %hi(kern_linear_pte_xor), %g5
- and %g7, 3, %g7
- or %g5, %lo(kern_linear_pte_xor), %g5
- sllx %g7, 3, %g7
- ldx [%g5 + %g7], %g2
-
.globl kvmap_linear_patch
kvmap_linear_patch:
- ba,pt %xcc, kvmap_dtlb_tsb4m_load
- xor %g2, %g4, %g5
+ ba,a,pt %xcc, kvmap_linear_early
kvmap_dtlb_vmalloc_addr:
KERN_PGTABLE_WALK(%g4, %g5, %g2, kvmap_dtlb_longpath)
TSB_LOCK_TAG(%g1, %g2, %g7)
-
- /* 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
- TSB_STORE(%g1, %g7)
-
TSB_WRITE(%g1, %g5, %g6)
/* fallthrough to TLB load */