sparc/kernel/dtlb_miss.S

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /* DTLB ** ICACHE line 1: Context 0 check and TSB load  */
0003     ldxa    [%g0] ASI_DMMU_TSB_8KB_PTR, %g1 ! Get TSB 8K pointer
0004     ldxa    [%g0] ASI_DMMU, %g6     ! Get TAG TARGET
0005     srlx    %g6, 48, %g5            ! Get context
0006     sllx    %g6, 22, %g6            ! Zero out context
0007     brz,pn  %g5, kvmap_dtlb         ! 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 /* DTLB ** ICACHE line 2: TSB compare and TLB load  */
0013     bne,pn  %xcc, tsb_miss_dtlb     ! Miss
0014      mov    FAULT_CODE_DTLB, %g3
0015     stxa    %g5, [%g0] ASI_DTLB_DATA_IN ! Load TLB
0016     retry                   ! Trap done
0017     nop
0018     nop
0019     nop
0020     nop
0021
0022 /* DTLB ** ICACHE line 3:               */
0023     nop
0024     nop
0025     nop
0026     nop
0027     nop
0028     nop
0029     nop
0030     nop
0031
0032 /* DTLB ** ICACHE line 4:               */
0033     nop
0034     nop
0035     nop
0036     nop
0037     nop
0038     nop
0039     nop
0040     nop