root/arch/sparc/kernel/itlb_miss.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* ITLB ** ICACHE line 1: Context 0 check and TSB load  */
   3         ldxa    [%g0] ASI_IMMU_TSB_8KB_PTR, %g1 ! Get TSB 8K pointer
   4         ldxa    [%g0] ASI_IMMU, %g6             ! Get TAG TARGET
   5         srlx    %g6, 48, %g5                    ! Get context
   6         sllx    %g6, 22, %g6                    ! Zero out context
   7         brz,pn  %g5, kvmap_itlb                 ! Context 0 processing
   8          srlx   %g6, 22, %g6                    ! Delay slot
   9         TSB_LOAD_QUAD(%g1, %g4)                 ! Load TSB entry
  10         cmp     %g4, %g6                        ! Compare TAG
  11 
  12 /* ITLB ** ICACHE line 2: TSB compare and TLB load      */
  13         bne,pn  %xcc, tsb_miss_itlb             ! Miss
  14          mov    FAULT_CODE_ITLB, %g3
  15         sethi   %hi(_PAGE_EXEC_4U), %g4
  16         andcc   %g5, %g4, %g0                   ! Executable?
  17         be,pn   %xcc, tsb_do_fault
  18          nop                                    ! Delay slot, fill me
  19         stxa    %g5, [%g0] ASI_ITLB_DATA_IN     ! Load TLB
  20         retry                                   ! Trap done
  21 
  22 /* ITLB ** ICACHE line 3:                               */
  23         nop
  24         nop
  25         nop
  26         nop
  27         nop
  28         nop
  29         nop
  30         nop
  31 
  32 /* ITLB ** ICACHE line 4:                               */
  33         nop
  34         nop
  35         nop
  36         nop
  37         nop
  38         nop
  39         nop
  40         nop