426 lines
10 KiB
ArmAsm
426 lines
10 KiB
ArmAsm
/* 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 >> HASH_SHIFT) & tsb_mask);
|
|
* tsb_ptr = tsb_base + (tsb_index * 16);
|
|
*/
|
|
#define COMPUTE_TSB_PTR(TSB_PTR, VADDR, HASH_SHIFT, TMP1, TMP2) \
|
|
and TSB_PTR, 0x7, TMP1; \
|
|
mov 512, TMP2; \
|
|
andn TSB_PTR, 0x7, TSB_PTR; \
|
|
sllx TMP2, TMP1, TMP2; \
|
|
srlx VADDR, HASH_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, PAGE_SHIFT, %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, PAGE_SHIFT, %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 */
|
|
|
|
sun4v_tsb_miss_common:
|
|
COMPUTE_TSB_PTR(%g1, %g4, PAGE_SHIFT, %g5, %g7)
|
|
|
|
sub %g2, TRAP_PER_CPU_FAULT_INFO, %g2
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
mov SCRATCHPAD_UTSBREG2, %g5
|
|
ldxa [%g5] ASI_SCRATCHPAD, %g5
|
|
cmp %g5, -1
|
|
be,pt %xcc, 80f
|
|
nop
|
|
COMPUTE_TSB_PTR(%g5, %g4, HPAGE_SHIFT, %g2, %g7)
|
|
|
|
/* That clobbered %g2, reload it. */
|
|
ldxa [%g0] ASI_SCRATCHPAD, %g2
|
|
sub %g2, TRAP_PER_CPU_FAULT_INFO, %g2
|
|
|
|
80: stx %g5, [%g2 + TRAP_PER_CPU_TSB_HUGE_TEMP]
|
|
#endif
|
|
|
|
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
|