sparc/kernel/itlb_miss.S

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* ITLB ** ICACHE line 1: Context 0 check and TSB load  */
0003     ldxa    [%g0] ASI_IMMU_TSB_8KB_PTR, %g1 ! Get TSB 8K pointer
0004     ldxa    [%g0] ASI_IMMU, %g6     ! Get TAG TARGET
0005     srlx    %g6, 48, %g5            ! Get context
0006     sllx    %g6, 22, %g6            ! Zero out context
0007     brz,pn  %g5, kvmap_itlb         ! Context 0 processing
0008      srlx   %g6, 22, %g6            ! Delay slot
0009     TSB_LOAD_QUAD(%g1, %g4)         ! Load TSB entry
0010     cmp %g4, %g6            ! Compare TAG
0011
0012 /* ITLB ** ICACHE line 2: TSB compare and TLB load  */
0013     bne,pn  %xcc, tsb_miss_itlb     ! Miss
0014      mov    FAULT_CODE_ITLB, %g3
0015     sethi   %hi(_PAGE_EXEC_4U), %g4
0016     andcc   %g5, %g4, %g0           ! Executable?
0017     be,pn   %xcc, tsb_do_fault
0018      nop                    ! Delay slot, fill me
0019     stxa    %g5, [%g0] ASI_ITLB_DATA_IN ! Load TLB
0020     retry                   ! Trap done
0021
0022 /* ITLB ** ICACHE line 3:               */
0023     nop
0024     nop
0025     nop
0026     nop
0027     nop
0028     nop
0029     nop
0030     nop
0031
0032 /* ITLB ** ICACHE line 4:               */
0033     nop
0034     nop
0035     nop
0036     nop
0037     nop
0038     nop
0039     nop
0040     nop