| /* sun4v_tlb_miss.S: Sun4v TLB miss handlers. |
| * |
| * Copyright (C) 2006 <davem@davemloft.net> |
| */ |
| |
| .text |
| .align 32 |
| |
| /* Load ITLB fault information into VADDR and CTX, using BASE. */ |
| #define LOAD_ITLB_INFO(BASE, VADDR, CTX) \ |
| ldx [BASE + HV_FAULT_I_ADDR_OFFSET], VADDR; \ |
| ldx [BASE + HV_FAULT_I_CTX_OFFSET], CTX; |
| |
| /* Load DTLB fault information into VADDR and CTX, using BASE. */ |
| #define LOAD_DTLB_INFO(BASE, VADDR, CTX) \ |
| ldx [BASE + HV_FAULT_D_ADDR_OFFSET], VADDR; \ |
| ldx [BASE + HV_FAULT_D_CTX_OFFSET], CTX; |
| |
| /* DEST = (VADDR >> 22) |
| * |
| * Branch to ZERO_CTX_LABEL if context is zero. |
| */ |
| #define COMPUTE_TAG_TARGET(DEST, VADDR, CTX, ZERO_CTX_LABEL) \ |
| srlx VADDR, 22, DEST; \ |
| brz,pn CTX, ZERO_CTX_LABEL; \ |
| nop; |
| |
| /* Create TSB pointer. This is something like: |
| * |
| * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL; |
| * tsb_base = tsb_reg & ~0x7UL; |
| * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask); |
| * tsb_ptr = tsb_base + (tsb_index * 16); |
| */ |
| #define COMPUTE_TSB_PTR(TSB_PTR, VADDR, TMP1, TMP2) \ |
| and TSB_PTR, 0x7, TMP1; \ |
| mov 512, TMP2; \ |
| andn TSB_PTR, 0x7, TSB_PTR; \ |
| sllx TMP2, TMP1, TMP2; \ |
| srlx VADDR, PAGE_SHIFT, TMP1; \ |
| sub TMP2, 1, TMP2; \ |
| and TMP1, TMP2, TMP1; \ |
| sllx TMP1, 4, TMP1; \ |
| add TSB_PTR, TMP1, TSB_PTR; |
| |
| sun4v_itlb_miss: |
| /* Load MMU Miss base into %g2. */ |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| |
| /* Load UTSB reg into %g1. */ |
| mov SCRATCHPAD_UTSBREG1, %g1 |
| ldxa [%g1] ASI_SCRATCHPAD, %g1 |
| |
| LOAD_ITLB_INFO(%g2, %g4, %g5) |
| COMPUTE_TAG_TARGET(%g6, %g4, %g5, kvmap_itlb_4v) |
| COMPUTE_TSB_PTR(%g1, %g4, %g3, %g7) |
| |
| /* Load TSB tag/pte into %g2/%g3 and compare the tag. */ |
| ldda [%g1] ASI_QUAD_LDD_PHYS_4V, %g2 |
| cmp %g2, %g6 |
| bne,a,pn %xcc, tsb_miss_page_table_walk |
| mov FAULT_CODE_ITLB, %g3 |
| andcc %g3, _PAGE_EXEC_4V, %g0 |
| be,a,pn %xcc, tsb_do_fault |
| mov FAULT_CODE_ITLB, %g3 |
| |
| /* We have a valid entry, make hypervisor call to load |
| * I-TLB and return from trap. |
| * |
| * %g3: PTE |
| * %g4: vaddr |
| */ |
| sun4v_itlb_load: |
| ldxa [%g0] ASI_SCRATCHPAD, %g6 |
| mov %o0, %g1 ! save %o0 |
| mov %o1, %g2 ! save %o1 |
| mov %o2, %g5 ! save %o2 |
| mov %o3, %g7 ! save %o3 |
| mov %g4, %o0 ! vaddr |
| ldx [%g6 + HV_FAULT_I_CTX_OFFSET], %o1 ! ctx |
| mov %g3, %o2 ! PTE |
| mov HV_MMU_IMMU, %o3 ! flags |
| ta HV_MMU_MAP_ADDR_TRAP |
| brnz,pn %o0, sun4v_itlb_error |
| mov %g2, %o1 ! restore %o1 |
| mov %g1, %o0 ! restore %o0 |
| mov %g5, %o2 ! restore %o2 |
| mov %g7, %o3 ! restore %o3 |
| |
| retry |
| |
| sun4v_dtlb_miss: |
| /* Load MMU Miss base into %g2. */ |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| |
| /* Load UTSB reg into %g1. */ |
| mov SCRATCHPAD_UTSBREG1, %g1 |
| ldxa [%g1] ASI_SCRATCHPAD, %g1 |
| |
| LOAD_DTLB_INFO(%g2, %g4, %g5) |
| COMPUTE_TAG_TARGET(%g6, %g4, %g5, kvmap_dtlb_4v) |
| COMPUTE_TSB_PTR(%g1, %g4, %g3, %g7) |
| |
| /* Load TSB tag/pte into %g2/%g3 and compare the tag. */ |
| ldda [%g1] ASI_QUAD_LDD_PHYS_4V, %g2 |
| cmp %g2, %g6 |
| bne,a,pn %xcc, tsb_miss_page_table_walk |
| mov FAULT_CODE_DTLB, %g3 |
| |
| /* We have a valid entry, make hypervisor call to load |
| * D-TLB and return from trap. |
| * |
| * %g3: PTE |
| * %g4: vaddr |
| */ |
| sun4v_dtlb_load: |
| ldxa [%g0] ASI_SCRATCHPAD, %g6 |
| mov %o0, %g1 ! save %o0 |
| mov %o1, %g2 ! save %o1 |
| mov %o2, %g5 ! save %o2 |
| mov %o3, %g7 ! save %o3 |
| mov %g4, %o0 ! vaddr |
| ldx [%g6 + HV_FAULT_D_CTX_OFFSET], %o1 ! ctx |
| mov %g3, %o2 ! PTE |
| mov HV_MMU_DMMU, %o3 ! flags |
| ta HV_MMU_MAP_ADDR_TRAP |
| brnz,pn %o0, sun4v_dtlb_error |
| mov %g2, %o1 ! restore %o1 |
| mov %g1, %o0 ! restore %o0 |
| mov %g5, %o2 ! restore %o2 |
| mov %g7, %o3 ! restore %o3 |
| |
| retry |
| |
| sun4v_dtlb_prot: |
| SET_GL(1) |
| |
| /* Load MMU Miss base into %g5. */ |
| ldxa [%g0] ASI_SCRATCHPAD, %g5 |
| |
| ldx [%g5 + HV_FAULT_D_ADDR_OFFSET], %g5 |
| rdpr %tl, %g1 |
| cmp %g1, 1 |
| bgu,pn %xcc, winfix_trampoline |
| nop |
| ba,pt %xcc, sparc64_realfault_common |
| mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4 |
| |
| /* Called from trap table: |
| * %g4: vaddr |
| * %g5: context |
| * %g6: TAG TARGET |
| */ |
| sun4v_itsb_miss: |
| mov SCRATCHPAD_UTSBREG1, %g1 |
| ldxa [%g1] ASI_SCRATCHPAD, %g1 |
| brz,pn %g5, kvmap_itlb_4v |
| mov FAULT_CODE_ITLB, %g3 |
| ba,a,pt %xcc, sun4v_tsb_miss_common |
| |
| /* Called from trap table: |
| * %g4: vaddr |
| * %g5: context |
| * %g6: TAG TARGET |
| */ |
| sun4v_dtsb_miss: |
| mov SCRATCHPAD_UTSBREG1, %g1 |
| ldxa [%g1] ASI_SCRATCHPAD, %g1 |
| brz,pn %g5, kvmap_dtlb_4v |
| mov FAULT_CODE_DTLB, %g3 |
| |
| /* fallthrough */ |
| |
| /* Create TSB pointer into %g1. This is something like: |
| * |
| * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL; |
| * tsb_base = tsb_reg & ~0x7UL; |
| * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask); |
| * tsb_ptr = tsb_base + (tsb_index * 16); |
| */ |
| sun4v_tsb_miss_common: |
| COMPUTE_TSB_PTR(%g1, %g4, %g5, %g7) |
| |
| /* Branch directly to page table lookup. We have SCRATCHPAD_MMU_MISS |
| * still in %g2, so it's quite trivial to get at the PGD PHYS value |
| * so we can preload it into %g7. |
| */ |
| sub %g2, TRAP_PER_CPU_FAULT_INFO, %g2 |
| ba,pt %xcc, tsb_miss_page_table_walk_sun4v_fastpath |
| ldx [%g2 + TRAP_PER_CPU_PGD_PADDR], %g7 |
| |
| sun4v_itlb_error: |
| sethi %hi(sun4v_err_itlb_vaddr), %g1 |
| stx %g4, [%g1 + %lo(sun4v_err_itlb_vaddr)] |
| sethi %hi(sun4v_err_itlb_ctx), %g1 |
| ldxa [%g0] ASI_SCRATCHPAD, %g6 |
| ldx [%g6 + HV_FAULT_I_CTX_OFFSET], %o1 |
| stx %o1, [%g1 + %lo(sun4v_err_itlb_ctx)] |
| sethi %hi(sun4v_err_itlb_pte), %g1 |
| stx %g3, [%g1 + %lo(sun4v_err_itlb_pte)] |
| sethi %hi(sun4v_err_itlb_error), %g1 |
| stx %o0, [%g1 + %lo(sun4v_err_itlb_error)] |
| |
| rdpr %tl, %g4 |
| cmp %g4, 1 |
| ble,pt %icc, 1f |
| sethi %hi(2f), %g7 |
| ba,pt %xcc, etraptl1 |
| or %g7, %lo(2f), %g7 |
| |
| 1: ba,pt %xcc, etrap |
| 2: or %g7, %lo(2b), %g7 |
| call sun4v_itlb_error_report |
| add %sp, PTREGS_OFF, %o0 |
| |
| /* NOTREACHED */ |
| |
| sun4v_dtlb_error: |
| sethi %hi(sun4v_err_dtlb_vaddr), %g1 |
| stx %g4, [%g1 + %lo(sun4v_err_dtlb_vaddr)] |
| sethi %hi(sun4v_err_dtlb_ctx), %g1 |
| ldxa [%g0] ASI_SCRATCHPAD, %g6 |
| ldx [%g6 + HV_FAULT_D_CTX_OFFSET], %o1 |
| stx %o1, [%g1 + %lo(sun4v_err_dtlb_ctx)] |
| sethi %hi(sun4v_err_dtlb_pte), %g1 |
| stx %g3, [%g1 + %lo(sun4v_err_dtlb_pte)] |
| sethi %hi(sun4v_err_dtlb_error), %g1 |
| stx %o0, [%g1 + %lo(sun4v_err_dtlb_error)] |
| |
| rdpr %tl, %g4 |
| cmp %g4, 1 |
| ble,pt %icc, 1f |
| sethi %hi(2f), %g7 |
| ba,pt %xcc, etraptl1 |
| or %g7, %lo(2f), %g7 |
| |
| 1: ba,pt %xcc, etrap |
| 2: or %g7, %lo(2b), %g7 |
| call sun4v_dtlb_error_report |
| add %sp, PTREGS_OFF, %o0 |
| |
| /* NOTREACHED */ |
| |
| /* Instruction Access Exception, tl0. */ |
| sun4v_iacc: |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| ldx [%g2 + HV_FAULT_I_TYPE_OFFSET], %g3 |
| ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4 |
| ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5 |
| sllx %g3, 16, %g3 |
| or %g5, %g3, %g5 |
| ba,pt %xcc, etrap |
| rd %pc, %g7 |
| mov %l4, %o1 |
| mov %l5, %o2 |
| call sun4v_insn_access_exception |
| add %sp, PTREGS_OFF, %o0 |
| ba,a,pt %xcc, rtrap_clr_l6 |
| |
| /* Instruction Access Exception, tl1. */ |
| sun4v_iacc_tl1: |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| ldx [%g2 + HV_FAULT_I_TYPE_OFFSET], %g3 |
| ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4 |
| ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5 |
| sllx %g3, 16, %g3 |
| or %g5, %g3, %g5 |
| ba,pt %xcc, etraptl1 |
| rd %pc, %g7 |
| mov %l4, %o1 |
| mov %l5, %o2 |
| call sun4v_insn_access_exception_tl1 |
| add %sp, PTREGS_OFF, %o0 |
| ba,a,pt %xcc, rtrap_clr_l6 |
| |
| /* Data Access Exception, tl0. */ |
| sun4v_dacc: |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3 |
| ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4 |
| ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5 |
| sllx %g3, 16, %g3 |
| or %g5, %g3, %g5 |
| ba,pt %xcc, etrap |
| rd %pc, %g7 |
| mov %l4, %o1 |
| mov %l5, %o2 |
| call sun4v_data_access_exception |
| add %sp, PTREGS_OFF, %o0 |
| ba,a,pt %xcc, rtrap_clr_l6 |
| |
| /* Data Access Exception, tl1. */ |
| sun4v_dacc_tl1: |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3 |
| ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4 |
| ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5 |
| sllx %g3, 16, %g3 |
| or %g5, %g3, %g5 |
| ba,pt %xcc, etraptl1 |
| rd %pc, %g7 |
| mov %l4, %o1 |
| mov %l5, %o2 |
| call sun4v_data_access_exception_tl1 |
| add %sp, PTREGS_OFF, %o0 |
| ba,a,pt %xcc, rtrap_clr_l6 |
| |
| /* Memory Address Unaligned. */ |
| sun4v_mna: |
| /* Window fixup? */ |
| rdpr %tl, %g2 |
| cmp %g2, 1 |
| ble,pt %icc, 1f |
| nop |
| |
| SET_GL(1) |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g5 |
| mov HV_FAULT_TYPE_UNALIGNED, %g3 |
| ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g4 |
| sllx %g3, 16, %g3 |
| or %g4, %g3, %g4 |
| ba,pt %xcc, winfix_mna |
| rdpr %tpc, %g3 |
| /* not reached */ |
| |
| 1: ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| mov HV_FAULT_TYPE_UNALIGNED, %g3 |
| ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4 |
| ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5 |
| sllx %g3, 16, %g3 |
| or %g5, %g3, %g5 |
| |
| ba,pt %xcc, etrap |
| rd %pc, %g7 |
| mov %l4, %o1 |
| mov %l5, %o2 |
| call sun4v_do_mna |
| add %sp, PTREGS_OFF, %o0 |
| ba,a,pt %xcc, rtrap_clr_l6 |
| |
| /* Privileged Action. */ |
| sun4v_privact: |
| ba,pt %xcc, etrap |
| rd %pc, %g7 |
| call do_privact |
| add %sp, PTREGS_OFF, %o0 |
| ba,a,pt %xcc, rtrap_clr_l6 |
| |
| /* Unaligned ldd float, tl0. */ |
| sun4v_lddfmna: |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3 |
| ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4 |
| ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5 |
| sllx %g3, 16, %g3 |
| or %g5, %g3, %g5 |
| ba,pt %xcc, etrap |
| rd %pc, %g7 |
| mov %l4, %o1 |
| mov %l5, %o2 |
| call handle_lddfmna |
| add %sp, PTREGS_OFF, %o0 |
| ba,a,pt %xcc, rtrap_clr_l6 |
| |
| /* Unaligned std float, tl0. */ |
| sun4v_stdfmna: |
| ldxa [%g0] ASI_SCRATCHPAD, %g2 |
| ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3 |
| ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4 |
| ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5 |
| sllx %g3, 16, %g3 |
| or %g5, %g3, %g5 |
| ba,pt %xcc, etrap |
| rd %pc, %g7 |
| mov %l4, %o1 |
| mov %l5, %o2 |
| call handle_stdfmna |
| add %sp, PTREGS_OFF, %o0 |
| ba,a,pt %xcc, rtrap_clr_l6 |
| |
| #define BRANCH_ALWAYS 0x10680000 |
| #define NOP 0x01000000 |
| #define SUN4V_DO_PATCH(OLD, NEW) \ |
| sethi %hi(NEW), %g1; \ |
| or %g1, %lo(NEW), %g1; \ |
| sethi %hi(OLD), %g2; \ |
| or %g2, %lo(OLD), %g2; \ |
| sub %g1, %g2, %g1; \ |
| sethi %hi(BRANCH_ALWAYS), %g3; \ |
| sll %g1, 11, %g1; \ |
| srl %g1, 11 + 2, %g1; \ |
| or %g3, %lo(BRANCH_ALWAYS), %g3; \ |
| or %g3, %g1, %g3; \ |
| stw %g3, [%g2]; \ |
| sethi %hi(NOP), %g3; \ |
| or %g3, %lo(NOP), %g3; \ |
| stw %g3, [%g2 + 0x4]; \ |
| flush %g2; |
| |
| .globl sun4v_patch_tlb_handlers |
| .type sun4v_patch_tlb_handlers,#function |
| sun4v_patch_tlb_handlers: |
| SUN4V_DO_PATCH(tl0_iamiss, sun4v_itlb_miss) |
| SUN4V_DO_PATCH(tl1_iamiss, sun4v_itlb_miss) |
| SUN4V_DO_PATCH(tl0_damiss, sun4v_dtlb_miss) |
| SUN4V_DO_PATCH(tl1_damiss, sun4v_dtlb_miss) |
| SUN4V_DO_PATCH(tl0_daprot, sun4v_dtlb_prot) |
| SUN4V_DO_PATCH(tl1_daprot, sun4v_dtlb_prot) |
| SUN4V_DO_PATCH(tl0_iax, sun4v_iacc) |
| SUN4V_DO_PATCH(tl1_iax, sun4v_iacc_tl1) |
| SUN4V_DO_PATCH(tl0_dax, sun4v_dacc) |
| SUN4V_DO_PATCH(tl1_dax, sun4v_dacc_tl1) |
| SUN4V_DO_PATCH(tl0_mna, sun4v_mna) |
| SUN4V_DO_PATCH(tl1_mna, sun4v_mna) |
| SUN4V_DO_PATCH(tl0_lddfmna, sun4v_lddfmna) |
| SUN4V_DO_PATCH(tl0_stdfmna, sun4v_stdfmna) |
| SUN4V_DO_PATCH(tl0_privact, sun4v_privact) |
| retl |
| nop |
| .size sun4v_patch_tlb_handlers,.-sun4v_patch_tlb_handlers |
