1 /* sun4v_tlb_miss.S: Sun4v TLB miss handlers.
3 * Copyright (C) 2006 <davem@davemloft.net>
10 /* Load MMU Miss base into %g2. */
11 ldxa [%g0] ASI_SCRATCHPAD, %g3
13 /* Load UTSB reg into %g1. */
14 mov SCRATCHPAD_UTSBREG1, %g1
15 ldxa [%g1] ASI_SCRATCHPAD, %g1
17 /* Create a TAG TARGET, "(vaddr>>22) | (ctx << 48)", in %g6.
18 * Branch if kernel TLB miss. The kernel TSB and user TSB miss
19 * code wants the missing virtual address in %g4, so that value
20 * cannot be modified through the entirety of this handler.
22 ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4
23 ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5
27 brz,pn %g5, kvmap_itlb_4v
30 /* Create TSB pointer. This is something like:
32 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
33 * tsb_base = tsb_reg & ~0x7UL;
41 /* TSB index mask is in %g7, tsb base is in %g1. Compute
42 * the TSB entry pointer into %g1:
44 * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
45 * tsb_ptr = tsb_base + (tsb_index * 16);
47 srlx %g4, PAGE_SHIFT, %g3
52 /* Load TSB tag/pte into %g2/%g3 and compare the tag. */
53 ldda [%g1] ASI_QUAD_LDD_PHYS, %g2
55 sethi %hi(_PAGE_EXEC), %g7
56 bne,a,pn %xcc, tsb_miss_page_table_walk
57 mov FAULT_CODE_ITLB, %g3
59 be,a,pn %xcc, tsb_do_fault
60 mov FAULT_CODE_ITLB, %g3
62 /* We have a valid entry, make hypervisor call to load
63 * I-TLB and return from trap.
67 * %g6: TAG TARGET (only "CTX << 48" part matters)
70 mov %o0, %g1 ! save %o0
71 mov %o1, %g2 ! save %o1
72 mov %o2, %g5 ! save %o2
73 mov %o3, %g7 ! save %o3
75 srlx %g6, 48, %o1 ! ctx
77 mov HV_MMU_IMMU, %o3 ! flags
78 ta HV_MMU_MAP_ADDR_TRAP
79 mov %g1, %o0 ! restore %o0
80 mov %g2, %o1 ! restore %o1
81 mov %g5, %o2 ! restore %o2
82 mov %g7, %o3 ! restore %o3
87 /* Load MMU Miss base into %g2. */
88 ldxa [%g0] ASI_SCRATCHPAD, %g2
90 /* Load UTSB reg into %g1. */
91 mov SCRATCHPAD_UTSBREG1, %g1
92 ldxa [%g1 + %g1] ASI_SCRATCHPAD, %g1
94 /* Create a TAG TARGET, "(vaddr>>22) | (ctx << 48)", in %g6.
95 * Branch if kernel TLB miss. The kernel TSB and user TSB miss
96 * code wants the missing virtual address in %g4, so that value
97 * cannot be modified through the entirety of this handler.
99 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
100 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
104 brz,pn %g5, kvmap_dtlb_4v
107 /* Create TSB pointer. This is something like:
109 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
110 * tsb_base = tsb_reg & ~0x7UL;
118 /* TSB index mask is in %g7, tsb base is in %g1. Compute
119 * the TSB entry pointer into %g1:
121 * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
122 * tsb_ptr = tsb_base + (tsb_index * 16);
124 srlx %g4, PAGE_SHIFT, %g3
129 /* Load TSB tag/pte into %g2/%g3 and compare the tag. */
130 ldda [%g1] ASI_QUAD_LDD_PHYS, %g2
132 bne,a,pn %xcc, tsb_miss_page_table_walk
133 mov FAULT_CODE_ITLB, %g3
135 /* We have a valid entry, make hypervisor call to load
136 * D-TLB and return from trap.
140 * %g6: TAG TARGET (only "CTX << 48" part matters)
143 mov %o0, %g1 ! save %o0
144 mov %o1, %g2 ! save %o1
145 mov %o2, %g5 ! save %o2
146 mov %o3, %g7 ! save %o3
148 srlx %g6, 48, %o1 ! ctx
150 mov HV_MMU_DMMU, %o3 ! flags
151 ta HV_MMU_MAP_ADDR_TRAP
152 mov %g1, %o0 ! restore %o0
153 mov %g2, %o1 ! restore %o1
154 mov %g5, %o2 ! restore %o2
155 mov %g7, %o3 ! restore %o3
160 /* Load MMU Miss base into %g2. */
161 ldxa [%g0] ASI_SCRATCHPAD, %g2
163 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g5
166 bgu,pn %xcc, winfix_trampoline
168 ba,pt %xcc, sparc64_realfault_common
169 mov FAULT_CODE_DTLB | FAULT_CODE_WRITE, %g4
171 /* Called from trap table with TAG TARGET placed into
172 * %g6 and SCRATCHPAD_UTSBREG1 contents in %g1.
175 ba,pt %xcc, sun4v_tsb_miss_common
176 mov FAULT_CODE_ITLB, %g3
178 /* Called from trap table with TAG TARGET placed into
179 * %g6 and SCRATCHPAD_UTSBREG1 contents in %g1.
182 mov FAULT_CODE_DTLB, %g3
184 /* Create TSB pointer into %g1. This is something like:
186 * index_mask = (512 << (tsb_reg & 0x7UL)) - 1UL;
187 * tsb_base = tsb_reg & ~0x7UL;
188 * tsb_index = ((vaddr >> PAGE_SHIFT) & tsb_mask);
189 * tsb_ptr = tsb_base + (tsb_index * 16);
191 sun4v_tsb_miss_common:
197 srlx %g4, PAGE_SHIFT, %g2
200 ba,pt %xcc, tsb_miss_page_table_walk
203 /* Instruction Access Exception, tl0. */
205 ldxa [%g0] ASI_SCRATCHPAD, %g2
206 ldx [%g2 + HV_FAULT_I_TYPE_OFFSET], %g3
207 ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4
208 ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5
215 call sun4v_insn_access_exception
216 add %sp, PTREGS_OFF, %o0
217 ba,a,pt %xcc, rtrap_clr_l6
219 /* Instruction Access Exception, tl1. */
221 ldxa [%g0] ASI_SCRATCHPAD, %g2
222 ldx [%g2 + HV_FAULT_I_TYPE_OFFSET], %g3
223 ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4
224 ldx [%g2 + HV_FAULT_I_CTX_OFFSET], %g5
231 call sun4v_insn_access_exception_tl1
232 add %sp, PTREGS_OFF, %o0
233 ba,a,pt %xcc, rtrap_clr_l6
235 /* Data Access Exception, tl0. */
237 ldxa [%g0] ASI_SCRATCHPAD, %g2
238 ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
239 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
240 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
247 call sun4v_data_access_exception
248 add %sp, PTREGS_OFF, %o0
249 ba,a,pt %xcc, rtrap_clr_l6
251 /* Data Access Exception, tl1. */
253 ldxa [%g0] ASI_SCRATCHPAD, %g2
254 ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
255 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
256 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
263 call sun4v_data_access_exception_tl1
264 add %sp, PTREGS_OFF, %o0
265 ba,a,pt %xcc, rtrap_clr_l6
267 /* Memory Address Unaligned. */
269 ldxa [%g0] ASI_SCRATCHPAD, %g2
270 mov HV_FAULT_TYPE_UNALIGNED, %g3
271 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
272 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
279 bgu,pn %icc, winfix_mna
287 add %sp, PTREGS_OFF, %o0
288 ba,a,pt %xcc, rtrap_clr_l6
290 /* Privileged Action. */
295 add %sp, PTREGS_OFF, %o0
296 ba,a,pt %xcc, rtrap_clr_l6
298 /* Unaligned ldd float, tl0. */
300 ldxa [%g0] ASI_SCRATCHPAD, %g2
301 ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
302 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
303 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
311 add %sp, PTREGS_OFF, %o0
312 ba,a,pt %xcc, rtrap_clr_l6
314 /* Unaligned std float, tl0. */
316 ldxa [%g0] ASI_SCRATCHPAD, %g2
317 ldx [%g2 + HV_FAULT_D_TYPE_OFFSET], %g3
318 ldx [%g2 + HV_FAULT_D_ADDR_OFFSET], %g4
319 ldx [%g2 + HV_FAULT_D_CTX_OFFSET], %g5
327 add %sp, PTREGS_OFF, %o0
328 ba,a,pt %xcc, rtrap_clr_l6
330 #define BRANCH_ALWAYS 0x10680000
331 #define NOP 0x01000000
332 #define SUN4V_DO_PATCH(OLD, NEW) \
333 sethi %hi(NEW), %g1; \
334 or %g1, %lo(NEW), %g1; \
335 sethi %hi(OLD), %g2; \
336 or %g2, %lo(OLD), %g2; \
338 sethi %hi(BRANCH_ALWAYS), %g3; \
340 or %g3, %lo(BRANCH_ALWAYS), %g3; \
343 sethi %hi(NOP), %g3; \
344 or %g3, %lo(NOP), %g3; \
345 stw %g3, [%g2 + 0x4]; \
348 .globl sun4v_patch_tlb_handlers
349 .type sun4v_patch_tlb_handlers,#function
350 sun4v_patch_tlb_handlers:
351 SUN4V_DO_PATCH(tl0_iamiss, sun4v_itlb_miss)
352 SUN4V_DO_PATCH(tl1_iamiss, sun4v_itlb_miss)
353 SUN4V_DO_PATCH(tl0_damiss, sun4v_dtlb_miss)
354 SUN4V_DO_PATCH(tl1_damiss, sun4v_dtlb_miss)
355 SUN4V_DO_PATCH(tl0_daprot, sun4v_dtlb_prot)
356 SUN4V_DO_PATCH(tl1_daprot, sun4v_dtlb_prot)
357 SUN4V_DO_PATCH(tl0_iax, sun4v_iacc)
358 SUN4V_DO_PATCH(tl1_iax, sun4v_iacc_tl1)
359 SUN4V_DO_PATCH(tl0_dax, sun4v_dacc)
360 SUN4V_DO_PATCH(tl1_dax, sun4v_dacc_tl1)
361 SUN4V_DO_PATCH(tl0_mna, sun4v_mna)
362 SUN4V_DO_PATCH(tl1_mna, sun4v_mna)
363 SUN4V_DO_PATCH(tl0_lddfmna, sun4v_lddfmna)
364 SUN4V_DO_PATCH(tl0_stdfmna, sun4v_stdfmna)
365 SUN4V_DO_PATCH(tl0_privact, sun4v_privact)
368 .size sun4v_patch_tlb_handlers,.-sun4v_patch_tlb_handlers