1 /* sun4v_tlb_miss.S: Sun4v TLB miss handlers.
3 * Copyright (C) 2006 <davem@davemloft.net>
9 /* Load ITLB fault information into VADDR and CTX, using BASE. */
10 #define LOAD_ITLB_INFO(BASE, VADDR, CTX) \
11 ldx [BASE + HV_FAULT_I_ADDR_OFFSET], VADDR; \
12 ldx [BASE + HV_FAULT_I_CTX_OFFSET], CTX;
14 /* Load DTLB fault information into VADDR and CTX, using BASE. */
15 #define LOAD_DTLB_INFO(BASE, VADDR, CTX) \
16 ldx [BASE + HV_FAULT_D_ADDR_OFFSET], VADDR; \
17 ldx [BASE + HV_FAULT_D_CTX_OFFSET], CTX;
19 /* DEST = (VADDR >> 22)
21 * Branch to ZERO_CTX_LABEL if context is zero.
23 #define COMPUTE_TAG_TARGET(DEST, VADDR, CTX, ZERO_CTX_LABEL) \
24 srlx VADDR, 22, DEST; \
25 brz,pn CTX, ZERO_CTX_LABEL; \
28 /* Create TSB pointer. This is something like:
30 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
31 * tsb_base = tsb_reg & ~0x7UL;
32 * tsb_index = ((vaddr >> HASH_SHIFT) & tsb_mask);
33 * tsb_ptr = tsb_base + (tsb_index * 16);
35 #define COMPUTE_TSB_PTR(TSB_PTR, VADDR, HASH_SHIFT, TMP1, TMP2) \
36 and TSB_PTR, 0x7, TMP1; \
38 andn TSB_PTR, 0x7, TSB_PTR; \
39 sllx TMP2, TMP1, TMP2; \
40 srlx VADDR, HASH_SHIFT, TMP1; \
42 and TMP1, TMP2, TMP1; \
44 add TSB_PTR, TMP1, TSB_PTR;
47 /* Load MMU Miss base into %g2. */
48 ldxa [%g0] ASI_SCRATCHPAD, %g2
50 /* Load UTSB reg into %g1. */
51 mov SCRATCHPAD_UTSBREG1, %g1
52 ldxa [%g1] ASI_SCRATCHPAD, %g1
54 LOAD_ITLB_INFO(%g2, %g4, %g5)
55 COMPUTE_TAG_TARGET(%g6, %g4, %g5, kvmap_itlb_4v)
56 COMPUTE_TSB_PTR(%g1, %g4, PAGE_SHIFT, %g3, %g7)
58 /* Load TSB tag/pte into %g2/%g3 and compare the tag. */
59 ldda [%g1] ASI_QUAD_LDD_PHYS_4V, %g2
61 bne,a,pn %xcc, tsb_miss_page_table_walk
62 mov FAULT_CODE_ITLB, %g3
63 andcc %g3, _PAGE_EXEC_4V, %g0
64 be,a,pn %xcc, tsb_do_fault
65 mov FAULT_CODE_ITLB, %g3
67 /* We have a valid entry, make hypervisor call to load
68 * I-TLB and return from trap.
74 ldxa [%g0] ASI_SCRATCHPAD, %g6
75 mov %o0, %g1 ! save %o0
76 mov %o1, %g2 ! save %o1
77 mov %o2, %g5 ! save %o2
78 mov %o3, %g7 ! save %o3
80 ldx [%g6 + HV_FAULT_I_CTX_OFFSET], %o1 ! ctx
82 mov HV_MMU_IMMU, %o3 ! flags
83 ta HV_MMU_MAP_ADDR_TRAP
84 brnz,pn %o0, sun4v_itlb_error
85 mov %g2, %o1 ! restore %o1
86 mov %g1, %o0 ! restore %o0
87 mov %g5, %o2 ! restore %o2
88 mov %g7, %o3 ! restore %o3
93 /* Load MMU Miss base into %g2. */
94 ldxa [%g0] ASI_SCRATCHPAD, %g2
96 /* Load UTSB reg into %g1. */
97 mov SCRATCHPAD_UTSBREG1, %g1
98 ldxa [%g1] ASI_SCRATCHPAD, %g1
100 LOAD_DTLB_INFO(%g2, %g4, %g5)
101 COMPUTE_TAG_TARGET(%g6, %g4, %g5, kvmap_dtlb_4v)
102 COMPUTE_TSB_PTR(%g1, %g4, PAGE_SHIFT, %g3, %g7)
104 /* Load TSB tag/pte into %g2/%g3 and compare the tag. */
105 ldda [%g1] ASI_QUAD_LDD_PHYS_4V, %g2
107 bne,a,pn %xcc, tsb_miss_page_table_walk
108 mov FAULT_CODE_DTLB, %g3
110 /* We have a valid entry, make hypervisor call to load
111 * D-TLB and return from trap.
117 ldxa [%g0] ASI_SCRATCHPAD, %g6
118 mov %o0, %g1 ! save %o0
119 mov %o1, %g2 ! save %o1
120 mov %o2, %g5 ! save %o2
121 mov %o3, %g7 ! save %o3
123 ldx [%g6 + HV_FAULT_D_CTX_OFFSET], %o1 ! ctx
125 mov HV_MMU_DMMU, %o3 ! flags
126 ta HV_MMU_MAP_ADDR_TRAP
127 brnz,pn %o0, sun4v_dtlb_error
128 mov %g2, %o1 ! restore %o1
129 mov %g1, %o0 ! restore %o0
130 mov %g5, %o2 ! restore %o2
131 mov %g7, %o3 ! restore %o3
138 /* Load MMU Miss base into %g5. */
139 ldxa [%g0] ASI_SCRATCHPAD, %g5
141 ldx [%g5 + HV_FAULT_D_ADDR_OFFSET], %g5
144 bgu,pn %xcc, winfix_trampoline
145 mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
146 ba,pt %xcc, sparc64_realfault_common
149 /* Called from trap table:
155 mov SCRATCHPAD_UTSBREG1, %g1
156 ldxa [%g1] ASI_SCRATCHPAD, %g1
157 brz,pn %g5, kvmap_itlb_4v
158 mov FAULT_CODE_ITLB, %g3
159 ba,a,pt %xcc, sun4v_tsb_miss_common
161 /* Called from trap table:
167 mov SCRATCHPAD_UTSBREG1, %g1
168 ldxa [%g1] ASI_SCRATCHPAD, %g1
169 brz,pn %g5, kvmap_dtlb_4v
170 mov FAULT_CODE_DTLB, %g3
174 sun4v_tsb_miss_common:
175 COMPUTE_TSB_PTR(%g1, %g4, PAGE_SHIFT, %g5, %g7)
177 sub %g2, TRAP_PER_CPU_FAULT_INFO, %g2
179 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
180 mov SCRATCHPAD_UTSBREG2, %g5
181 ldxa [%g5] ASI_SCRATCHPAD, %g5
185 COMPUTE_TSB_PTR(%g5, %g4, REAL_HPAGE_SHIFT, %g2, %g7)
187 /* That clobbered %g2, reload it. */
188 ldxa [%g0] ASI_SCRATCHPAD, %g2
189 sub %g2, TRAP_PER_CPU_FAULT_INFO, %g2
191 80: stx %g5, [%g2 + TRAP_PER_CPU_TSB_HUGE_TEMP]
194 ba,pt %xcc, tsb_miss_page_table_walk_sun4v_fastpath
195 ldx [%g2 + TRAP_PER_CPU_PGD_PADDR], %g7
200 ble,pt %icc, sun4v_bad_ra
201 or %g0, FAULT_CODE_BAD_RA | FAULT_CODE_ITLB, %g1
203 sethi %hi(sun4v_err_itlb_vaddr), %g1
204 stx %g4, [%g1 + %lo(sun4v_err_itlb_vaddr)]
205 sethi %hi(sun4v_err_itlb_ctx), %g1
206 ldxa [%g0] ASI_SCRATCHPAD, %g6
207 ldx [%g6 + HV_FAULT_I_CTX_OFFSET], %o1
208 stx %o1, [%g1 + %lo(sun4v_err_itlb_ctx)]
209 sethi %hi(sun4v_err_itlb_pte), %g1
210 stx %g3, [%g1 + %lo(sun4v_err_itlb_pte)]
211 sethi %hi(sun4v_err_itlb_error), %g1
212 stx %o0, [%g1 + %lo(sun4v_err_itlb_error)]
217 1: or %g7, %lo(1f), %g7
219 call sun4v_itlb_error_report
220 add %sp, PTREGS_OFF, %o0
227 ble,pt %icc, sun4v_bad_ra
228 or %g0, FAULT_CODE_BAD_RA | FAULT_CODE_DTLB, %g1
230 sethi %hi(sun4v_err_dtlb_vaddr), %g1
231 stx %g4, [%g1 + %lo(sun4v_err_dtlb_vaddr)]
232 sethi %hi(sun4v_err_dtlb_ctx), %g1
233 ldxa [%g0] ASI_SCRATCHPAD, %g6
234 ldx [%g6 + HV_FAULT_D_CTX_OFFSET], %o1
235 stx %o1, [%g1 + %lo(sun4v_err_dtlb_ctx)]
236 sethi %hi(sun4v_err_dtlb_pte), %g1
237 stx %g3, [%g1 + %lo(sun4v_err_dtlb_pte)]
238 sethi %hi(sun4v_err_dtlb_error), %g1
239 stx %o0, [%g1 + %lo(sun4v_err_dtlb_error)]
244 1: or %g7, %lo(1f), %g7
246 call sun4v_dtlb_error_report
247 add %sp, PTREGS_OFF, %o0
253 ba,pt %xcc, sparc64_realfault_common
258 /* Instruction Access Exception, tl0. */
260 ldxa [%g0] ASI_SCRATCHPAD, %g2
261 ldx [%g2 + HV_FAULT_I_TYPE_OFFSET], %g3
262 ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4
263 ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5
270 call sun4v_insn_access_exception
271 add %sp, PTREGS_OFF, %o0
274 /* Instruction Access Exception, tl1. */
276 ldxa [%g0] ASI_SCRATCHPAD, %g2
277 ldx [%g2 + HV_FAULT_I_TYPE_OFFSET], %g3
278 ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4
279 ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5
286 call sun4v_insn_access_exception_tl1
287 add %sp, PTREGS_OFF, %o0
290 /* Data Access Exception, tl0. */
292 ldxa [%g0] ASI_SCRATCHPAD, %g2
293 ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
294 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
295 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
302 call sun4v_data_access_exception
303 add %sp, PTREGS_OFF, %o0
306 /* Data Access Exception, tl1. */
308 ldxa [%g0] ASI_SCRATCHPAD, %g2
309 ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
310 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
311 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
318 call sun4v_data_access_exception_tl1
319 add %sp, PTREGS_OFF, %o0
322 /* Memory Address Unaligned. */
331 ldxa [%g0] ASI_SCRATCHPAD, %g2
332 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g5
333 mov HV_FAULT_TYPE_UNALIGNED, %g3
334 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g4
337 ba,pt %xcc, winfix_mna
341 1: ldxa [%g0] ASI_SCRATCHPAD, %g2
342 mov HV_FAULT_TYPE_UNALIGNED, %g3
343 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
344 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
353 add %sp, PTREGS_OFF, %o0
357 /* Privileged Action. */
362 add %sp, PTREGS_OFF, %o0
365 /* Unaligned ldd float, tl0. */
367 ldxa [%g0] ASI_SCRATCHPAD, %g2
368 ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
369 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
370 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
378 add %sp, PTREGS_OFF, %o0
381 /* Unaligned std float, tl0. */
383 ldxa [%g0] ASI_SCRATCHPAD, %g2
384 ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
385 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
386 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
394 add %sp, PTREGS_OFF, %o0
397 #define BRANCH_ALWAYS 0x10680000
398 #define NOP 0x01000000
399 #define SUN4V_DO_PATCH(OLD, NEW) \
400 sethi %hi(NEW), %g1; \
401 or %g1, %lo(NEW), %g1; \
402 sethi %hi(OLD), %g2; \
403 or %g2, %lo(OLD), %g2; \
405 sethi %hi(BRANCH_ALWAYS), %g3; \
407 srl %g1, 11 + 2, %g1; \
408 or %g3, %lo(BRANCH_ALWAYS), %g3; \
411 sethi %hi(NOP), %g3; \
412 or %g3, %lo(NOP), %g3; \
413 stw %g3, [%g2 + 0x4]; \
416 .globl sun4v_patch_tlb_handlers
417 .type sun4v_patch_tlb_handlers,#function
418 sun4v_patch_tlb_handlers:
419 SUN4V_DO_PATCH(tl0_iamiss, sun4v_itlb_miss)
420 SUN4V_DO_PATCH(tl1_iamiss, sun4v_itlb_miss)
421 SUN4V_DO_PATCH(tl0_damiss, sun4v_dtlb_miss)
422 SUN4V_DO_PATCH(tl1_damiss, sun4v_dtlb_miss)
423 SUN4V_DO_PATCH(tl0_daprot, sun4v_dtlb_prot)
424 SUN4V_DO_PATCH(tl1_daprot, sun4v_dtlb_prot)
425 SUN4V_DO_PATCH(tl0_iax, sun4v_iacc)
426 SUN4V_DO_PATCH(tl1_iax, sun4v_iacc_tl1)
427 SUN4V_DO_PATCH(tl0_dax, sun4v_dacc)
428 SUN4V_DO_PATCH(tl1_dax, sun4v_dacc_tl1)
429 SUN4V_DO_PATCH(tl0_mna, sun4v_mna)
430 SUN4V_DO_PATCH(tl1_mna, sun4v_mna)
431 SUN4V_DO_PATCH(tl0_lddfmna, sun4v_lddfmna)
432 SUN4V_DO_PATCH(tl0_stdfmna, sun4v_stdfmna)
433 SUN4V_DO_PATCH(tl0_privact, sun4v_privact)
436 .size sun4v_patch_tlb_handlers,.-sun4v_patch_tlb_handlers