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0ebc4cda BH |
1 | /* |
2 | * This file contains the 64-bit "server" PowerPC variant | |
3 | * of the low level exception handling including exception | |
4 | * vectors, exception return, part of the slb and stab | |
5 | * handling and other fixed offset specific things. | |
6 | * | |
7 | * This file is meant to be #included from head_64.S due to | |
25985edc | 8 | * position dependent assembly. |
0ebc4cda BH |
9 | * |
10 | * Most of this originates from head_64.S and thus has the same | |
11 | * copyright history. | |
12 | * | |
13 | */ | |
14 | ||
7230c564 | 15 | #include <asm/hw_irq.h> |
8aa34ab8 | 16 | #include <asm/exception-64s.h> |
46f52210 | 17 | #include <asm/ptrace.h> |
8aa34ab8 | 18 | |
0ebc4cda BH |
19 | /* |
20 | * We layout physical memory as follows: | |
21 | * 0x0000 - 0x00ff : Secondary processor spin code | |
c1fb6816 MN |
22 | * 0x0100 - 0x17ff : pSeries Interrupt prologs |
23 | * 0x1800 - 0x4000 : interrupt support common interrupt prologs | |
24 | * 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1 | |
25 | * 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1 | |
0ebc4cda | 26 | * 0x7000 - 0x7fff : FWNMI data area |
c1fb6816 MN |
27 | * 0x8000 - 0x8fff : Initial (CPU0) segment table |
28 | * 0x9000 - : Early init and support code | |
0ebc4cda | 29 | */ |
742415d6 MN |
30 | /* Syscall routine is used twice, in reloc-off and reloc-on paths */ |
31 | #define SYSCALL_PSERIES_1 \ | |
32 | BEGIN_FTR_SECTION \ | |
33 | cmpdi r0,0x1ebe ; \ | |
34 | beq- 1f ; \ | |
35 | END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \ | |
36 | mr r9,r13 ; \ | |
37 | GET_PACA(r13) ; \ | |
38 | mfspr r11,SPRN_SRR0 ; \ | |
39 | 0: | |
40 | ||
41 | #define SYSCALL_PSERIES_2_RFID \ | |
42 | mfspr r12,SPRN_SRR1 ; \ | |
43 | ld r10,PACAKBASE(r13) ; \ | |
44 | LOAD_HANDLER(r10, system_call_entry) ; \ | |
45 | mtspr SPRN_SRR0,r10 ; \ | |
46 | ld r10,PACAKMSR(r13) ; \ | |
47 | mtspr SPRN_SRR1,r10 ; \ | |
48 | rfid ; \ | |
49 | b . ; /* prevent speculative execution */ | |
50 | ||
51 | #define SYSCALL_PSERIES_3 \ | |
52 | /* Fast LE/BE switch system call */ \ | |
53 | 1: mfspr r12,SPRN_SRR1 ; \ | |
54 | xori r12,r12,MSR_LE ; \ | |
55 | mtspr SPRN_SRR1,r12 ; \ | |
56 | rfid ; /* return to userspace */ \ | |
57 | b . ; \ | |
58 | 2: mfspr r12,SPRN_SRR1 ; \ | |
59 | andi. r12,r12,MSR_PR ; \ | |
60 | bne 0b ; \ | |
61 | mtspr SPRN_SRR0,r3 ; \ | |
62 | mtspr SPRN_SRR1,r4 ; \ | |
63 | mtspr SPRN_SDR1,r5 ; \ | |
64 | rfid ; \ | |
65 | b . ; /* prevent speculative execution */ | |
66 | ||
4700dfaf MN |
67 | #if defined(CONFIG_RELOCATABLE) |
68 | /* | |
69 | * We can't branch directly; in the direct case we use LR | |
70 | * and system_call_entry restores LR. (We thus need to move | |
71 | * LR to r10 in the RFID case too.) | |
72 | */ | |
73 | #define SYSCALL_PSERIES_2_DIRECT \ | |
74 | mflr r10 ; \ | |
75 | ld r12,PACAKBASE(r13) ; \ | |
76 | LOAD_HANDLER(r12, system_call_entry_direct) ; \ | |
77 | mtlr r12 ; \ | |
78 | mfspr r12,SPRN_SRR1 ; \ | |
79 | /* Re-use of r13... No spare regs to do this */ \ | |
80 | li r13,MSR_RI ; \ | |
81 | mtmsrd r13,1 ; \ | |
82 | GET_PACA(r13) ; /* get r13 back */ \ | |
83 | blr ; | |
84 | #else | |
85 | /* We can branch directly */ | |
86 | #define SYSCALL_PSERIES_2_DIRECT \ | |
87 | mfspr r12,SPRN_SRR1 ; \ | |
88 | li r10,MSR_RI ; \ | |
89 | mtmsrd r10,1 ; /* Set RI (EE=0) */ \ | |
90 | b system_call_entry_direct ; | |
91 | #endif | |
0ebc4cda | 92 | |
0ebc4cda BH |
93 | /* |
94 | * This is the start of the interrupt handlers for pSeries | |
95 | * This code runs with relocation off. | |
96 | * Code from here to __end_interrupts gets copied down to real | |
97 | * address 0x100 when we are running a relocatable kernel. | |
98 | * Therefore any relative branches in this section must only | |
99 | * branch to labels in this section. | |
100 | */ | |
101 | . = 0x100 | |
102 | .globl __start_interrupts | |
103 | __start_interrupts: | |
104 | ||
948cf67c BH |
105 | .globl system_reset_pSeries; |
106 | system_reset_pSeries: | |
44e9309f | 107 | HMT_MEDIUM_PPR_DISCARD |
948cf67c BH |
108 | SET_SCRATCH0(r13) |
109 | #ifdef CONFIG_PPC_P7_NAP | |
110 | BEGIN_FTR_SECTION | |
111 | /* Running native on arch 2.06 or later, check if we are | |
112 | * waking up from nap. We only handle no state loss and | |
113 | * supervisor state loss. We do -not- handle hypervisor | |
114 | * state loss at this time. | |
115 | */ | |
116 | mfspr r13,SPRN_SRR1 | |
371fefd6 PM |
117 | rlwinm. r13,r13,47-31,30,31 |
118 | beq 9f | |
119 | ||
120 | /* waking up from powersave (nap) state */ | |
121 | cmpwi cr1,r13,2 | |
948cf67c BH |
122 | /* Total loss of HV state is fatal, we could try to use the |
123 | * PIR to locate a PACA, then use an emergency stack etc... | |
124 | * but for now, let's just stay stuck here | |
125 | */ | |
371fefd6 PM |
126 | bgt cr1,. |
127 | GET_PACA(r13) | |
128 | ||
129 | #ifdef CONFIG_KVM_BOOK3S_64_HV | |
f0888f70 PM |
130 | li r0,KVM_HWTHREAD_IN_KERNEL |
131 | stb r0,HSTATE_HWTHREAD_STATE(r13) | |
132 | /* Order setting hwthread_state vs. testing hwthread_req */ | |
133 | sync | |
134 | lbz r0,HSTATE_HWTHREAD_REQ(r13) | |
135 | cmpwi r0,0 | |
136 | beq 1f | |
371fefd6 PM |
137 | b kvm_start_guest |
138 | 1: | |
139 | #endif | |
140 | ||
141 | beq cr1,2f | |
142 | b .power7_wakeup_noloss | |
143 | 2: b .power7_wakeup_loss | |
144 | 9: | |
969391c5 | 145 | END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) |
948cf67c | 146 | #endif /* CONFIG_PPC_P7_NAP */ |
b01c8b54 PM |
147 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD, |
148 | NOTEST, 0x100) | |
0ebc4cda BH |
149 | |
150 | . = 0x200 | |
b01c8b54 PM |
151 | machine_check_pSeries_1: |
152 | /* This is moved out of line as it can be patched by FW, but | |
153 | * some code path might still want to branch into the original | |
154 | * vector | |
155 | */ | |
156 | b machine_check_pSeries | |
0ebc4cda BH |
157 | |
158 | . = 0x300 | |
159 | .globl data_access_pSeries | |
160 | data_access_pSeries: | |
44e9309f | 161 | HMT_MEDIUM_PPR_DISCARD |
673b189a | 162 | SET_SCRATCH0(r13) |
0ebc4cda | 163 | BEGIN_FTR_SECTION |
b01c8b54 PM |
164 | b data_access_check_stab |
165 | data_access_not_stab: | |
166 | END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB) | |
b01c8b54 | 167 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD, |
697d3899 | 168 | KVMTEST, 0x300) |
0ebc4cda BH |
169 | |
170 | . = 0x380 | |
171 | .globl data_access_slb_pSeries | |
172 | data_access_slb_pSeries: | |
44e9309f | 173 | HMT_MEDIUM_PPR_DISCARD |
673b189a | 174 | SET_SCRATCH0(r13) |
697d3899 | 175 | EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380) |
0ebc4cda BH |
176 | std r3,PACA_EXSLB+EX_R3(r13) |
177 | mfspr r3,SPRN_DAR | |
0ebc4cda BH |
178 | #ifdef __DISABLED__ |
179 | /* Keep that around for when we re-implement dynamic VSIDs */ | |
180 | cmpdi r3,0 | |
181 | bge slb_miss_user_pseries | |
182 | #endif /* __DISABLED__ */ | |
b01c8b54 | 183 | mfspr r12,SPRN_SRR1 |
0ebc4cda BH |
184 | #ifndef CONFIG_RELOCATABLE |
185 | b .slb_miss_realmode | |
186 | #else | |
187 | /* | |
188 | * We can't just use a direct branch to .slb_miss_realmode | |
189 | * because the distance from here to there depends on where | |
190 | * the kernel ends up being put. | |
191 | */ | |
192 | mfctr r11 | |
193 | ld r10,PACAKBASE(r13) | |
194 | LOAD_HANDLER(r10, .slb_miss_realmode) | |
195 | mtctr r10 | |
196 | bctr | |
197 | #endif | |
198 | ||
b3e6b5df | 199 | STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access) |
0ebc4cda BH |
200 | |
201 | . = 0x480 | |
202 | .globl instruction_access_slb_pSeries | |
203 | instruction_access_slb_pSeries: | |
44e9309f | 204 | HMT_MEDIUM_PPR_DISCARD |
673b189a | 205 | SET_SCRATCH0(r13) |
de56a948 | 206 | EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480) |
0ebc4cda BH |
207 | std r3,PACA_EXSLB+EX_R3(r13) |
208 | mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ | |
0ebc4cda BH |
209 | #ifdef __DISABLED__ |
210 | /* Keep that around for when we re-implement dynamic VSIDs */ | |
211 | cmpdi r3,0 | |
212 | bge slb_miss_user_pseries | |
213 | #endif /* __DISABLED__ */ | |
b01c8b54 | 214 | mfspr r12,SPRN_SRR1 |
0ebc4cda BH |
215 | #ifndef CONFIG_RELOCATABLE |
216 | b .slb_miss_realmode | |
217 | #else | |
218 | mfctr r11 | |
219 | ld r10,PACAKBASE(r13) | |
220 | LOAD_HANDLER(r10, .slb_miss_realmode) | |
221 | mtctr r10 | |
222 | bctr | |
223 | #endif | |
224 | ||
b3e6b5df BH |
225 | /* We open code these as we can't have a ". = x" (even with |
226 | * x = "." within a feature section | |
227 | */ | |
a5d4f3ad | 228 | . = 0x500; |
b3e6b5df BH |
229 | .globl hardware_interrupt_pSeries; |
230 | .globl hardware_interrupt_hv; | |
a5d4f3ad | 231 | hardware_interrupt_pSeries: |
b3e6b5df | 232 | hardware_interrupt_hv: |
a5d4f3ad | 233 | BEGIN_FTR_SECTION |
b01c8b54 PM |
234 | _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt, |
235 | EXC_HV, SOFTEN_TEST_HV) | |
236 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502) | |
de56a948 PM |
237 | FTR_SECTION_ELSE |
238 | _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt, | |
9e368f29 | 239 | EXC_STD, SOFTEN_TEST_HV_201) |
de56a948 | 240 | KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500) |
969391c5 | 241 | ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) |
a5d4f3ad | 242 | |
b3e6b5df | 243 | STD_EXCEPTION_PSERIES(0x600, 0x600, alignment) |
de56a948 | 244 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600) |
b01c8b54 | 245 | |
b3e6b5df | 246 | STD_EXCEPTION_PSERIES(0x700, 0x700, program_check) |
de56a948 | 247 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700) |
b01c8b54 | 248 | |
b3e6b5df | 249 | STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable) |
de56a948 | 250 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800) |
a5d4f3ad | 251 | |
b3e6b5df | 252 | MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer) |
dabe859e | 253 | STD_EXCEPTION_HV(0x980, 0x982, hdecrementer) |
a5d4f3ad | 254 | |
1dbdafec | 255 | MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super) |
de56a948 | 256 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00) |
b01c8b54 | 257 | |
b3e6b5df | 258 | STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b) |
de56a948 | 259 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00) |
0ebc4cda BH |
260 | |
261 | . = 0xc00 | |
262 | .globl system_call_pSeries | |
263 | system_call_pSeries: | |
264 | HMT_MEDIUM | |
b01c8b54 PM |
265 | #ifdef CONFIG_KVM_BOOK3S_64_HANDLER |
266 | SET_SCRATCH0(r13) | |
267 | GET_PACA(r13) | |
268 | std r9,PACA_EXGEN+EX_R9(r13) | |
269 | std r10,PACA_EXGEN+EX_R10(r13) | |
270 | mfcr r9 | |
271 | KVMTEST(0xc00) | |
272 | GET_SCRATCH0(r13) | |
273 | #endif | |
742415d6 MN |
274 | SYSCALL_PSERIES_1 |
275 | SYSCALL_PSERIES_2_RFID | |
276 | SYSCALL_PSERIES_3 | |
b01c8b54 PM |
277 | KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) |
278 | ||
b3e6b5df | 279 | STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step) |
de56a948 | 280 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00) |
b3e6b5df BH |
281 | |
282 | /* At 0xe??? we have a bunch of hypervisor exceptions, we branch | |
283 | * out of line to handle them | |
284 | */ | |
285 | . = 0xe00 | |
e6a74c6e | 286 | hv_exception_trampoline: |
b3e6b5df BH |
287 | b h_data_storage_hv |
288 | . = 0xe20 | |
289 | b h_instr_storage_hv | |
290 | . = 0xe40 | |
291 | b emulation_assist_hv | |
292 | . = 0xe50 | |
293 | b hmi_exception_hv | |
294 | . = 0xe60 | |
295 | b hmi_exception_hv | |
655bb3f4 IM |
296 | . = 0xe80 |
297 | b h_doorbell_hv | |
0ebc4cda BH |
298 | |
299 | /* We need to deal with the Altivec unavailable exception | |
300 | * here which is at 0xf20, thus in the middle of the | |
301 | * prolog code of the PerformanceMonitor one. A little | |
302 | * trickery is thus necessary | |
303 | */ | |
c86e2ead | 304 | performance_monitor_pSeries_1: |
0ebc4cda BH |
305 | . = 0xf00 |
306 | b performance_monitor_pSeries | |
307 | ||
c86e2ead | 308 | altivec_unavailable_pSeries_1: |
0ebc4cda BH |
309 | . = 0xf20 |
310 | b altivec_unavailable_pSeries | |
311 | ||
c86e2ead | 312 | vsx_unavailable_pSeries_1: |
0ebc4cda BH |
313 | . = 0xf40 |
314 | b vsx_unavailable_pSeries | |
315 | ||
316 | #ifdef CONFIG_CBE_RAS | |
b3e6b5df | 317 | STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error) |
5ccf55dd | 318 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202) |
0ebc4cda | 319 | #endif /* CONFIG_CBE_RAS */ |
b01c8b54 | 320 | |
b3e6b5df | 321 | STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint) |
de56a948 | 322 | KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300) |
b01c8b54 | 323 | |
b92a66a6 | 324 | . = 0x1500 |
51cf2b30 | 325 | .global denorm_exception_hv |
b92a66a6 | 326 | denorm_exception_hv: |
44e9309f | 327 | HMT_MEDIUM_PPR_DISCARD |
b92a66a6 MN |
328 | mtspr SPRN_SPRG_HSCRATCH0,r13 |
329 | mfspr r13,SPRN_SPRG_HPACA | |
330 | std r9,PACA_EXGEN+EX_R9(r13) | |
44e9309f | 331 | HMT_MEDIUM_PPR_SAVE(PACA_EXGEN, r9) |
b92a66a6 MN |
332 | std r10,PACA_EXGEN+EX_R10(r13) |
333 | std r11,PACA_EXGEN+EX_R11(r13) | |
334 | std r12,PACA_EXGEN+EX_R12(r13) | |
335 | mfspr r9,SPRN_SPRG_HSCRATCH0 | |
336 | std r9,PACA_EXGEN+EX_R13(r13) | |
337 | mfcr r9 | |
338 | ||
339 | #ifdef CONFIG_PPC_DENORMALISATION | |
340 | mfspr r10,SPRN_HSRR1 | |
341 | mfspr r11,SPRN_HSRR0 /* save HSRR0 */ | |
342 | andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */ | |
343 | addi r11,r11,-4 /* HSRR0 is next instruction */ | |
344 | bne+ denorm_assist | |
345 | #endif | |
346 | ||
347 | EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV) | |
348 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500) | |
349 | ||
0ebc4cda | 350 | #ifdef CONFIG_CBE_RAS |
b3e6b5df | 351 | STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance) |
5ccf55dd | 352 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602) |
0ebc4cda | 353 | #endif /* CONFIG_CBE_RAS */ |
b01c8b54 | 354 | |
b3e6b5df | 355 | STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist) |
de56a948 | 356 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700) |
b01c8b54 | 357 | |
0ebc4cda | 358 | #ifdef CONFIG_CBE_RAS |
b3e6b5df | 359 | STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal) |
5ccf55dd | 360 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802) |
faab4dd2 MN |
361 | #else |
362 | . = 0x1800 | |
0ebc4cda BH |
363 | #endif /* CONFIG_CBE_RAS */ |
364 | ||
0ebc4cda | 365 | |
b3e6b5df BH |
366 | /*** Out of line interrupts support ***/ |
367 | ||
faab4dd2 | 368 | .align 7 |
b01c8b54 PM |
369 | /* moved from 0x200 */ |
370 | machine_check_pSeries: | |
371 | .globl machine_check_fwnmi | |
372 | machine_check_fwnmi: | |
44e9309f | 373 | HMT_MEDIUM_PPR_DISCARD |
b01c8b54 PM |
374 | SET_SCRATCH0(r13) /* save r13 */ |
375 | EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common, | |
376 | EXC_STD, KVMTEST, 0x200) | |
377 | KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200) | |
378 | ||
b01c8b54 PM |
379 | /* moved from 0x300 */ |
380 | data_access_check_stab: | |
381 | GET_PACA(r13) | |
382 | std r9,PACA_EXSLB+EX_R9(r13) | |
383 | std r10,PACA_EXSLB+EX_R10(r13) | |
384 | mfspr r10,SPRN_DAR | |
385 | mfspr r9,SPRN_DSISR | |
386 | srdi r10,r10,60 | |
387 | rlwimi r10,r9,16,0x20 | |
de56a948 | 388 | #ifdef CONFIG_KVM_BOOK3S_PR |
3c42bf8a | 389 | lbz r9,HSTATE_IN_GUEST(r13) |
b01c8b54 PM |
390 | rlwimi r10,r9,8,0x300 |
391 | #endif | |
392 | mfcr r9 | |
393 | cmpwi r10,0x2c | |
394 | beq do_stab_bolted_pSeries | |
395 | mtcrf 0x80,r9 | |
396 | ld r9,PACA_EXSLB+EX_R9(r13) | |
397 | ld r10,PACA_EXSLB+EX_R10(r13) | |
398 | b data_access_not_stab | |
399 | do_stab_bolted_pSeries: | |
400 | std r11,PACA_EXSLB+EX_R11(r13) | |
401 | std r12,PACA_EXSLB+EX_R12(r13) | |
402 | GET_SCRATCH0(r10) | |
403 | std r10,PACA_EXSLB+EX_R13(r13) | |
404 | EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD) | |
b01c8b54 | 405 | |
697d3899 PM |
406 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300) |
407 | KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380) | |
de56a948 PM |
408 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400) |
409 | KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480) | |
410 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900) | |
b01c8b54 PM |
411 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982) |
412 | ||
b92a66a6 MN |
413 | #ifdef CONFIG_PPC_DENORMALISATION |
414 | denorm_assist: | |
415 | BEGIN_FTR_SECTION | |
416 | /* | |
417 | * To denormalise we need to move a copy of the register to itself. | |
418 | * For POWER6 do that here for all FP regs. | |
419 | */ | |
420 | mfmsr r10 | |
421 | ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1) | |
422 | xori r10,r10,(MSR_FE0|MSR_FE1) | |
423 | mtmsrd r10 | |
424 | sync | |
425 | fmr 0,0 | |
426 | fmr 1,1 | |
427 | fmr 2,2 | |
428 | fmr 3,3 | |
429 | fmr 4,4 | |
430 | fmr 5,5 | |
431 | fmr 6,6 | |
432 | fmr 7,7 | |
433 | fmr 8,8 | |
434 | fmr 9,9 | |
435 | fmr 10,10 | |
436 | fmr 11,11 | |
437 | fmr 12,12 | |
438 | fmr 13,13 | |
439 | fmr 14,14 | |
440 | fmr 15,15 | |
441 | fmr 16,16 | |
442 | fmr 17,17 | |
443 | fmr 18,18 | |
444 | fmr 19,19 | |
445 | fmr 20,20 | |
446 | fmr 21,21 | |
447 | fmr 22,22 | |
448 | fmr 23,23 | |
449 | fmr 24,24 | |
450 | fmr 25,25 | |
451 | fmr 26,26 | |
452 | fmr 27,27 | |
453 | fmr 28,28 | |
454 | fmr 29,29 | |
455 | fmr 30,30 | |
456 | fmr 31,31 | |
457 | FTR_SECTION_ELSE | |
458 | /* | |
459 | * To denormalise we need to move a copy of the register to itself. | |
460 | * For POWER7 do that here for the first 32 VSX registers only. | |
461 | */ | |
462 | mfmsr r10 | |
463 | oris r10,r10,MSR_VSX@h | |
464 | mtmsrd r10 | |
465 | sync | |
466 | XVCPSGNDP(0,0,0) | |
467 | XVCPSGNDP(1,1,1) | |
468 | XVCPSGNDP(2,2,2) | |
469 | XVCPSGNDP(3,3,3) | |
470 | XVCPSGNDP(4,4,4) | |
471 | XVCPSGNDP(5,5,5) | |
472 | XVCPSGNDP(6,6,6) | |
473 | XVCPSGNDP(7,7,7) | |
474 | XVCPSGNDP(8,8,8) | |
475 | XVCPSGNDP(9,9,9) | |
476 | XVCPSGNDP(10,10,10) | |
477 | XVCPSGNDP(11,11,11) | |
478 | XVCPSGNDP(12,12,12) | |
479 | XVCPSGNDP(13,13,13) | |
480 | XVCPSGNDP(14,14,14) | |
481 | XVCPSGNDP(15,15,15) | |
482 | XVCPSGNDP(16,16,16) | |
483 | XVCPSGNDP(17,17,17) | |
484 | XVCPSGNDP(18,18,18) | |
485 | XVCPSGNDP(19,19,19) | |
486 | XVCPSGNDP(20,20,20) | |
487 | XVCPSGNDP(21,21,21) | |
488 | XVCPSGNDP(22,22,22) | |
489 | XVCPSGNDP(23,23,23) | |
490 | XVCPSGNDP(24,24,24) | |
491 | XVCPSGNDP(25,25,25) | |
492 | XVCPSGNDP(26,26,26) | |
493 | XVCPSGNDP(27,27,27) | |
494 | XVCPSGNDP(28,28,28) | |
495 | XVCPSGNDP(29,29,29) | |
496 | XVCPSGNDP(30,30,30) | |
497 | XVCPSGNDP(31,31,31) | |
498 | ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) | |
499 | mtspr SPRN_HSRR0,r11 | |
500 | mtcrf 0x80,r9 | |
501 | ld r9,PACA_EXGEN+EX_R9(r13) | |
44e9309f | 502 | RESTORE_PPR_PACA(PACA_EXGEN, r10) |
b92a66a6 MN |
503 | ld r10,PACA_EXGEN+EX_R10(r13) |
504 | ld r11,PACA_EXGEN+EX_R11(r13) | |
505 | ld r12,PACA_EXGEN+EX_R12(r13) | |
506 | ld r13,PACA_EXGEN+EX_R13(r13) | |
507 | HRFID | |
508 | b . | |
509 | #endif | |
510 | ||
b01c8b54 | 511 | .align 7 |
b3e6b5df | 512 | /* moved from 0xe00 */ |
b01c8b54 PM |
513 | STD_EXCEPTION_HV(., 0xe02, h_data_storage) |
514 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02) | |
515 | STD_EXCEPTION_HV(., 0xe22, h_instr_storage) | |
516 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22) | |
517 | STD_EXCEPTION_HV(., 0xe42, emulation_assist) | |
518 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42) | |
519 | STD_EXCEPTION_HV(., 0xe62, hmi_exception) /* need to flush cache ? */ | |
520 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62) | |
655bb3f4 IM |
521 | MASKABLE_EXCEPTION_HV(., 0xe82, h_doorbell) |
522 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82) | |
0ebc4cda BH |
523 | |
524 | /* moved from 0xf00 */ | |
b3e6b5df | 525 | STD_EXCEPTION_PSERIES(., 0xf00, performance_monitor) |
de56a948 | 526 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00) |
b3e6b5df | 527 | STD_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable) |
de56a948 | 528 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20) |
b3e6b5df | 529 | STD_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable) |
de56a948 | 530 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40) |
0ebc4cda BH |
531 | |
532 | /* | |
fe9e1d54 IM |
533 | * An interrupt came in while soft-disabled. We set paca->irq_happened, then: |
534 | * - If it was a decrementer interrupt, we bump the dec to max and and return. | |
535 | * - If it was a doorbell we return immediately since doorbells are edge | |
536 | * triggered and won't automatically refire. | |
537 | * - else we hard disable and return. | |
538 | * This is called with r10 containing the value to OR to the paca field. | |
0ebc4cda | 539 | */ |
7230c564 BH |
540 | #define MASKED_INTERRUPT(_H) \ |
541 | masked_##_H##interrupt: \ | |
542 | std r11,PACA_EXGEN+EX_R11(r13); \ | |
543 | lbz r11,PACAIRQHAPPENED(r13); \ | |
544 | or r11,r11,r10; \ | |
545 | stb r11,PACAIRQHAPPENED(r13); \ | |
fe9e1d54 IM |
546 | cmpwi r10,PACA_IRQ_DEC; \ |
547 | bne 1f; \ | |
7230c564 BH |
548 | lis r10,0x7fff; \ |
549 | ori r10,r10,0xffff; \ | |
550 | mtspr SPRN_DEC,r10; \ | |
551 | b 2f; \ | |
fe9e1d54 IM |
552 | 1: cmpwi r10,PACA_IRQ_DBELL; \ |
553 | beq 2f; \ | |
554 | mfspr r10,SPRN_##_H##SRR1; \ | |
7230c564 BH |
555 | rldicl r10,r10,48,1; /* clear MSR_EE */ \ |
556 | rotldi r10,r10,16; \ | |
557 | mtspr SPRN_##_H##SRR1,r10; \ | |
558 | 2: mtcrf 0x80,r9; \ | |
559 | ld r9,PACA_EXGEN+EX_R9(r13); \ | |
560 | ld r10,PACA_EXGEN+EX_R10(r13); \ | |
561 | ld r11,PACA_EXGEN+EX_R11(r13); \ | |
562 | GET_SCRATCH0(r13); \ | |
563 | ##_H##rfid; \ | |
0ebc4cda | 564 | b . |
7230c564 BH |
565 | |
566 | MASKED_INTERRUPT() | |
567 | MASKED_INTERRUPT(H) | |
0ebc4cda | 568 | |
7230c564 BH |
569 | /* |
570 | * Called from arch_local_irq_enable when an interrupt needs | |
fe9e1d54 IM |
571 | * to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate |
572 | * which kind of interrupt. MSR:EE is already off. We generate a | |
7230c564 BH |
573 | * stackframe like if a real interrupt had happened. |
574 | * | |
575 | * Note: While MSR:EE is off, we need to make sure that _MSR | |
576 | * in the generated frame has EE set to 1 or the exception | |
577 | * handler will not properly re-enable them. | |
578 | */ | |
579 | _GLOBAL(__replay_interrupt) | |
580 | /* We are going to jump to the exception common code which | |
581 | * will retrieve various register values from the PACA which | |
582 | * we don't give a damn about, so we don't bother storing them. | |
583 | */ | |
584 | mfmsr r12 | |
585 | mflr r11 | |
586 | mfcr r9 | |
587 | ori r12,r12,MSR_EE | |
fe9e1d54 IM |
588 | cmpwi r3,0x900 |
589 | beq decrementer_common | |
590 | cmpwi r3,0x500 | |
591 | beq hardware_interrupt_common | |
592 | BEGIN_FTR_SECTION | |
593 | cmpwi r3,0xe80 | |
594 | beq h_doorbell_common | |
595 | FTR_SECTION_ELSE | |
596 | cmpwi r3,0xa00 | |
597 | beq doorbell_super_common | |
598 | ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) | |
599 | blr | |
a5d4f3ad | 600 | |
0ebc4cda BH |
601 | #ifdef CONFIG_PPC_PSERIES |
602 | /* | |
603 | * Vectors for the FWNMI option. Share common code. | |
604 | */ | |
605 | .globl system_reset_fwnmi | |
606 | .align 7 | |
607 | system_reset_fwnmi: | |
44e9309f | 608 | HMT_MEDIUM_PPR_DISCARD |
673b189a | 609 | SET_SCRATCH0(r13) /* save r13 */ |
b01c8b54 PM |
610 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD, |
611 | NOTEST, 0x100) | |
0ebc4cda BH |
612 | |
613 | #endif /* CONFIG_PPC_PSERIES */ | |
614 | ||
615 | #ifdef __DISABLED__ | |
616 | /* | |
617 | * This is used for when the SLB miss handler has to go virtual, | |
618 | * which doesn't happen for now anymore but will once we re-implement | |
619 | * dynamic VSIDs for shared page tables | |
620 | */ | |
621 | slb_miss_user_pseries: | |
622 | std r10,PACA_EXGEN+EX_R10(r13) | |
623 | std r11,PACA_EXGEN+EX_R11(r13) | |
624 | std r12,PACA_EXGEN+EX_R12(r13) | |
673b189a | 625 | GET_SCRATCH0(r10) |
0ebc4cda BH |
626 | ld r11,PACA_EXSLB+EX_R9(r13) |
627 | ld r12,PACA_EXSLB+EX_R3(r13) | |
628 | std r10,PACA_EXGEN+EX_R13(r13) | |
629 | std r11,PACA_EXGEN+EX_R9(r13) | |
630 | std r12,PACA_EXGEN+EX_R3(r13) | |
631 | clrrdi r12,r13,32 | |
632 | mfmsr r10 | |
633 | mfspr r11,SRR0 /* save SRR0 */ | |
634 | ori r12,r12,slb_miss_user_common@l /* virt addr of handler */ | |
635 | ori r10,r10,MSR_IR|MSR_DR|MSR_RI | |
636 | mtspr SRR0,r12 | |
637 | mfspr r12,SRR1 /* and SRR1 */ | |
638 | mtspr SRR1,r10 | |
639 | rfid | |
640 | b . /* prevent spec. execution */ | |
641 | #endif /* __DISABLED__ */ | |
642 | ||
0ebc4cda BH |
643 | /* |
644 | * Code from here down to __end_handlers is invoked from the | |
645 | * exception prologs above. Because the prologs assemble the | |
646 | * addresses of these handlers using the LOAD_HANDLER macro, | |
61e2390e MN |
647 | * which uses an ori instruction, these handlers must be in |
648 | * the first 64k of the kernel image. | |
0ebc4cda BH |
649 | */ |
650 | ||
651 | /*** Common interrupt handlers ***/ | |
652 | ||
653 | STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception) | |
654 | ||
655 | /* | |
656 | * Machine check is different because we use a different | |
657 | * save area: PACA_EXMC instead of PACA_EXGEN. | |
658 | */ | |
659 | .align 7 | |
660 | .globl machine_check_common | |
661 | machine_check_common: | |
662 | EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) | |
663 | FINISH_NAP | |
664 | DISABLE_INTS | |
665 | bl .save_nvgprs | |
666 | addi r3,r1,STACK_FRAME_OVERHEAD | |
667 | bl .machine_check_exception | |
668 | b .ret_from_except | |
669 | ||
7450f6f0 BH |
670 | STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ) |
671 | STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt) | |
dabe859e | 672 | STD_EXCEPTION_COMMON(0x980, hdecrementer, .hdec_interrupt) |
1dbdafec IM |
673 | #ifdef CONFIG_PPC_DOORBELL |
674 | STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .doorbell_exception) | |
675 | #else | |
676 | STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, .unknown_exception) | |
677 | #endif | |
0ebc4cda BH |
678 | STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception) |
679 | STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception) | |
680 | STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception) | |
278a6cdc MN |
681 | STD_EXCEPTION_COMMON(0xe40, emulation_assist, .program_check_exception) |
682 | STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception) | |
655bb3f4 IM |
683 | #ifdef CONFIG_PPC_DOORBELL |
684 | STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .doorbell_exception) | |
685 | #else | |
686 | STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, .unknown_exception) | |
687 | #endif | |
7450f6f0 | 688 | STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception) |
0ebc4cda | 689 | STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception) |
b92a66a6 | 690 | STD_EXCEPTION_COMMON(0x1502, denorm, .unknown_exception) |
0ebc4cda BH |
691 | #ifdef CONFIG_ALTIVEC |
692 | STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception) | |
693 | #else | |
694 | STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception) | |
695 | #endif | |
696 | #ifdef CONFIG_CBE_RAS | |
697 | STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception) | |
698 | STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception) | |
699 | STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception) | |
700 | #endif /* CONFIG_CBE_RAS */ | |
701 | ||
c1fb6816 MN |
702 | /* |
703 | * Relocation-on interrupts: A subset of the interrupts can be delivered | |
704 | * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering | |
705 | * it. Addresses are the same as the original interrupt addresses, but | |
706 | * offset by 0xc000000000004000. | |
707 | * It's impossible to receive interrupts below 0x300 via this mechanism. | |
708 | * KVM: None of these traps are from the guest ; anything that escalated | |
709 | * to HV=1 from HV=0 is delivered via real mode handlers. | |
710 | */ | |
711 | ||
712 | /* | |
713 | * This uses the standard macro, since the original 0x300 vector | |
714 | * only has extra guff for STAB-based processors -- which never | |
715 | * come here. | |
716 | */ | |
717 | STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access) | |
718 | . = 0x4380 | |
719 | .globl data_access_slb_relon_pSeries | |
720 | data_access_slb_relon_pSeries: | |
44e9309f | 721 | HMT_MEDIUM_PPR_DISCARD |
c1fb6816 MN |
722 | SET_SCRATCH0(r13) |
723 | EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380) | |
724 | std r3,PACA_EXSLB+EX_R3(r13) | |
725 | mfspr r3,SPRN_DAR | |
726 | mfspr r12,SPRN_SRR1 | |
727 | #ifndef CONFIG_RELOCATABLE | |
728 | b .slb_miss_realmode | |
729 | #else | |
730 | /* | |
731 | * We can't just use a direct branch to .slb_miss_realmode | |
732 | * because the distance from here to there depends on where | |
733 | * the kernel ends up being put. | |
734 | */ | |
735 | mfctr r11 | |
736 | ld r10,PACAKBASE(r13) | |
737 | LOAD_HANDLER(r10, .slb_miss_realmode) | |
738 | mtctr r10 | |
739 | bctr | |
740 | #endif | |
741 | ||
742 | STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access) | |
743 | . = 0x4480 | |
744 | .globl instruction_access_slb_relon_pSeries | |
745 | instruction_access_slb_relon_pSeries: | |
44e9309f | 746 | HMT_MEDIUM_PPR_DISCARD |
c1fb6816 MN |
747 | SET_SCRATCH0(r13) |
748 | EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480) | |
749 | std r3,PACA_EXSLB+EX_R3(r13) | |
750 | mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ | |
751 | mfspr r12,SPRN_SRR1 | |
752 | #ifndef CONFIG_RELOCATABLE | |
753 | b .slb_miss_realmode | |
754 | #else | |
755 | mfctr r11 | |
756 | ld r10,PACAKBASE(r13) | |
757 | LOAD_HANDLER(r10, .slb_miss_realmode) | |
758 | mtctr r10 | |
759 | bctr | |
760 | #endif | |
761 | ||
762 | . = 0x4500 | |
763 | .globl hardware_interrupt_relon_pSeries; | |
764 | .globl hardware_interrupt_relon_hv; | |
765 | hardware_interrupt_relon_pSeries: | |
766 | hardware_interrupt_relon_hv: | |
767 | BEGIN_FTR_SECTION | |
768 | _MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV) | |
769 | FTR_SECTION_ELSE | |
770 | _MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR) | |
771 | ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_206) | |
772 | STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment) | |
773 | STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check) | |
774 | STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable) | |
775 | MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer) | |
776 | STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer) | |
1dbdafec | 777 | MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super) |
c1fb6816 MN |
778 | STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b) |
779 | ||
780 | . = 0x4c00 | |
781 | .globl system_call_relon_pSeries | |
782 | system_call_relon_pSeries: | |
783 | HMT_MEDIUM | |
784 | SYSCALL_PSERIES_1 | |
785 | SYSCALL_PSERIES_2_DIRECT | |
786 | SYSCALL_PSERIES_3 | |
787 | ||
788 | STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step) | |
789 | ||
790 | . = 0x4e00 | |
791 | b h_data_storage_relon_hv | |
792 | ||
793 | . = 0x4e20 | |
794 | b h_instr_storage_relon_hv | |
795 | ||
796 | . = 0x4e40 | |
797 | b emulation_assist_relon_hv | |
798 | ||
799 | . = 0x4e50 | |
800 | b hmi_exception_relon_hv | |
801 | ||
802 | . = 0x4e60 | |
803 | b hmi_exception_relon_hv | |
804 | ||
655bb3f4 IM |
805 | . = 0x4e80 |
806 | b h_doorbell_relon_hv | |
c1fb6816 MN |
807 | |
808 | performance_monitor_relon_pSeries_1: | |
809 | . = 0x4f00 | |
810 | b performance_monitor_relon_pSeries | |
811 | ||
812 | altivec_unavailable_relon_pSeries_1: | |
813 | . = 0x4f20 | |
814 | b altivec_unavailable_relon_pSeries | |
815 | ||
816 | vsx_unavailable_relon_pSeries_1: | |
817 | . = 0x4f40 | |
818 | b vsx_unavailable_relon_pSeries | |
819 | ||
c1fb6816 MN |
820 | STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint) |
821 | #ifdef CONFIG_PPC_DENORMALISATION | |
822 | . = 0x5500 | |
823 | b denorm_exception_hv | |
824 | #endif | |
c1fb6816 MN |
825 | #ifdef CONFIG_HVC_SCOM |
826 | STD_RELON_EXCEPTION_HV(0x5600, 0x1600, maintence_interrupt) | |
827 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1600) | |
828 | #endif /* CONFIG_HVC_SCOM */ | |
c1fb6816 | 829 | STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist) |
c1fb6816 MN |
830 | |
831 | /* Other future vectors */ | |
832 | .align 7 | |
833 | .globl __end_interrupts | |
834 | __end_interrupts: | |
835 | ||
0ebc4cda | 836 | .align 7 |
c1fb6816 MN |
837 | system_call_entry_direct: |
838 | #if defined(CONFIG_RELOCATABLE) | |
839 | /* The first level prologue may have used LR to get here, saving | |
840 | * orig in r10. To save hacking/ifdeffing common code, restore here. | |
841 | */ | |
842 | mtlr r10 | |
843 | #endif | |
0ebc4cda BH |
844 | system_call_entry: |
845 | b system_call_common | |
846 | ||
fe1952fc BH |
847 | ppc64_runlatch_on_trampoline: |
848 | b .__ppc64_runlatch_on | |
849 | ||
0ebc4cda BH |
850 | /* |
851 | * Here we have detected that the kernel stack pointer is bad. | |
852 | * R9 contains the saved CR, r13 points to the paca, | |
853 | * r10 contains the (bad) kernel stack pointer, | |
854 | * r11 and r12 contain the saved SRR0 and SRR1. | |
855 | * We switch to using an emergency stack, save the registers there, | |
856 | * and call kernel_bad_stack(), which panics. | |
857 | */ | |
858 | bad_stack: | |
859 | ld r1,PACAEMERGSP(r13) | |
860 | subi r1,r1,64+INT_FRAME_SIZE | |
861 | std r9,_CCR(r1) | |
862 | std r10,GPR1(r1) | |
863 | std r11,_NIP(r1) | |
864 | std r12,_MSR(r1) | |
865 | mfspr r11,SPRN_DAR | |
866 | mfspr r12,SPRN_DSISR | |
867 | std r11,_DAR(r1) | |
868 | std r12,_DSISR(r1) | |
869 | mflr r10 | |
870 | mfctr r11 | |
871 | mfxer r12 | |
872 | std r10,_LINK(r1) | |
873 | std r11,_CTR(r1) | |
874 | std r12,_XER(r1) | |
875 | SAVE_GPR(0,r1) | |
876 | SAVE_GPR(2,r1) | |
1977b502 PM |
877 | ld r10,EX_R3(r3) |
878 | std r10,GPR3(r1) | |
879 | SAVE_GPR(4,r1) | |
880 | SAVE_4GPRS(5,r1) | |
881 | ld r9,EX_R9(r3) | |
882 | ld r10,EX_R10(r3) | |
883 | SAVE_2GPRS(9,r1) | |
884 | ld r9,EX_R11(r3) | |
885 | ld r10,EX_R12(r3) | |
886 | ld r11,EX_R13(r3) | |
887 | std r9,GPR11(r1) | |
888 | std r10,GPR12(r1) | |
889 | std r11,GPR13(r1) | |
48404f2e PM |
890 | BEGIN_FTR_SECTION |
891 | ld r10,EX_CFAR(r3) | |
892 | std r10,ORIG_GPR3(r1) | |
893 | END_FTR_SECTION_IFSET(CPU_FTR_CFAR) | |
1977b502 | 894 | SAVE_8GPRS(14,r1) |
0ebc4cda BH |
895 | SAVE_10GPRS(22,r1) |
896 | lhz r12,PACA_TRAP_SAVE(r13) | |
897 | std r12,_TRAP(r1) | |
898 | addi r11,r1,INT_FRAME_SIZE | |
899 | std r11,0(r1) | |
900 | li r12,0 | |
901 | std r12,0(r11) | |
902 | ld r2,PACATOC(r13) | |
1977b502 PM |
903 | ld r11,exception_marker@toc(r2) |
904 | std r12,RESULT(r1) | |
905 | std r11,STACK_FRAME_OVERHEAD-16(r1) | |
0ebc4cda BH |
906 | 1: addi r3,r1,STACK_FRAME_OVERHEAD |
907 | bl .kernel_bad_stack | |
908 | b 1b | |
909 | ||
910 | /* | |
911 | * Here r13 points to the paca, r9 contains the saved CR, | |
912 | * SRR0 and SRR1 are saved in r11 and r12, | |
913 | * r9 - r13 are saved in paca->exgen. | |
914 | */ | |
915 | .align 7 | |
916 | .globl data_access_common | |
917 | data_access_common: | |
918 | mfspr r10,SPRN_DAR | |
919 | std r10,PACA_EXGEN+EX_DAR(r13) | |
920 | mfspr r10,SPRN_DSISR | |
921 | stw r10,PACA_EXGEN+EX_DSISR(r13) | |
922 | EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) | |
a546498f BH |
923 | DISABLE_INTS |
924 | ld r12,_MSR(r1) | |
0ebc4cda BH |
925 | ld r3,PACA_EXGEN+EX_DAR(r13) |
926 | lwz r4,PACA_EXGEN+EX_DSISR(r13) | |
927 | li r5,0x300 | |
278a6cdc | 928 | b .do_hash_page /* Try to handle as hpte fault */ |
0ebc4cda | 929 | |
b3e6b5df | 930 | .align 7 |
278a6cdc | 931 | .globl h_data_storage_common |
b3e6b5df | 932 | h_data_storage_common: |
278a6cdc MN |
933 | mfspr r10,SPRN_HDAR |
934 | std r10,PACA_EXGEN+EX_DAR(r13) | |
935 | mfspr r10,SPRN_HDSISR | |
936 | stw r10,PACA_EXGEN+EX_DSISR(r13) | |
937 | EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN) | |
938 | bl .save_nvgprs | |
a546498f | 939 | DISABLE_INTS |
278a6cdc MN |
940 | addi r3,r1,STACK_FRAME_OVERHEAD |
941 | bl .unknown_exception | |
942 | b .ret_from_except | |
b3e6b5df | 943 | |
0ebc4cda BH |
944 | .align 7 |
945 | .globl instruction_access_common | |
946 | instruction_access_common: | |
947 | EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) | |
a546498f BH |
948 | DISABLE_INTS |
949 | ld r12,_MSR(r1) | |
0ebc4cda BH |
950 | ld r3,_NIP(r1) |
951 | andis. r4,r12,0x5820 | |
952 | li r5,0x400 | |
953 | b .do_hash_page /* Try to handle as hpte fault */ | |
954 | ||
278a6cdc | 955 | STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception) |
b3e6b5df | 956 | |
0ebc4cda BH |
957 | /* |
958 | * Here is the common SLB miss user that is used when going to virtual | |
959 | * mode for SLB misses, that is currently not used | |
960 | */ | |
961 | #ifdef __DISABLED__ | |
962 | .align 7 | |
963 | .globl slb_miss_user_common | |
964 | slb_miss_user_common: | |
965 | mflr r10 | |
966 | std r3,PACA_EXGEN+EX_DAR(r13) | |
967 | stw r9,PACA_EXGEN+EX_CCR(r13) | |
968 | std r10,PACA_EXGEN+EX_LR(r13) | |
969 | std r11,PACA_EXGEN+EX_SRR0(r13) | |
970 | bl .slb_allocate_user | |
971 | ||
972 | ld r10,PACA_EXGEN+EX_LR(r13) | |
973 | ld r3,PACA_EXGEN+EX_R3(r13) | |
974 | lwz r9,PACA_EXGEN+EX_CCR(r13) | |
975 | ld r11,PACA_EXGEN+EX_SRR0(r13) | |
976 | mtlr r10 | |
977 | beq- slb_miss_fault | |
978 | ||
979 | andi. r10,r12,MSR_RI /* check for unrecoverable exception */ | |
980 | beq- unrecov_user_slb | |
981 | mfmsr r10 | |
982 | ||
983 | .machine push | |
984 | .machine "power4" | |
985 | mtcrf 0x80,r9 | |
986 | .machine pop | |
987 | ||
988 | clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */ | |
989 | mtmsrd r10,1 | |
990 | ||
991 | mtspr SRR0,r11 | |
992 | mtspr SRR1,r12 | |
993 | ||
994 | ld r9,PACA_EXGEN+EX_R9(r13) | |
995 | ld r10,PACA_EXGEN+EX_R10(r13) | |
996 | ld r11,PACA_EXGEN+EX_R11(r13) | |
997 | ld r12,PACA_EXGEN+EX_R12(r13) | |
998 | ld r13,PACA_EXGEN+EX_R13(r13) | |
999 | rfid | |
1000 | b . | |
1001 | ||
1002 | slb_miss_fault: | |
1003 | EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN) | |
1004 | ld r4,PACA_EXGEN+EX_DAR(r13) | |
1005 | li r5,0 | |
1006 | std r4,_DAR(r1) | |
1007 | std r5,_DSISR(r1) | |
1008 | b handle_page_fault | |
1009 | ||
1010 | unrecov_user_slb: | |
1011 | EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN) | |
1012 | DISABLE_INTS | |
1013 | bl .save_nvgprs | |
1014 | 1: addi r3,r1,STACK_FRAME_OVERHEAD | |
1015 | bl .unrecoverable_exception | |
1016 | b 1b | |
1017 | ||
1018 | #endif /* __DISABLED__ */ | |
1019 | ||
1020 | ||
1021 | /* | |
1022 | * r13 points to the PACA, r9 contains the saved CR, | |
1023 | * r12 contain the saved SRR1, SRR0 is still ready for return | |
1024 | * r3 has the faulting address | |
1025 | * r9 - r13 are saved in paca->exslb. | |
1026 | * r3 is saved in paca->slb_r3 | |
1027 | * We assume we aren't going to take any exceptions during this procedure. | |
1028 | */ | |
1029 | _GLOBAL(slb_miss_realmode) | |
1030 | mflr r10 | |
1031 | #ifdef CONFIG_RELOCATABLE | |
1032 | mtctr r11 | |
1033 | #endif | |
1034 | ||
1035 | stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ | |
1036 | std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ | |
1037 | ||
1038 | bl .slb_allocate_realmode | |
1039 | ||
1040 | /* All done -- return from exception. */ | |
1041 | ||
1042 | ld r10,PACA_EXSLB+EX_LR(r13) | |
1043 | ld r3,PACA_EXSLB+EX_R3(r13) | |
1044 | lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ | |
0ebc4cda BH |
1045 | |
1046 | mtlr r10 | |
1047 | ||
1048 | andi. r10,r12,MSR_RI /* check for unrecoverable exception */ | |
1049 | beq- 2f | |
1050 | ||
1051 | .machine push | |
1052 | .machine "power4" | |
1053 | mtcrf 0x80,r9 | |
1054 | mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ | |
1055 | .machine pop | |
1056 | ||
44e9309f | 1057 | RESTORE_PPR_PACA(PACA_EXSLB, r9) |
0ebc4cda BH |
1058 | ld r9,PACA_EXSLB+EX_R9(r13) |
1059 | ld r10,PACA_EXSLB+EX_R10(r13) | |
1060 | ld r11,PACA_EXSLB+EX_R11(r13) | |
1061 | ld r12,PACA_EXSLB+EX_R12(r13) | |
1062 | ld r13,PACA_EXSLB+EX_R13(r13) | |
1063 | rfid | |
1064 | b . /* prevent speculative execution */ | |
1065 | ||
4f8cf36f | 1066 | 2: mfspr r11,SPRN_SRR0 |
0ebc4cda BH |
1067 | ld r10,PACAKBASE(r13) |
1068 | LOAD_HANDLER(r10,unrecov_slb) | |
1069 | mtspr SPRN_SRR0,r10 | |
1070 | ld r10,PACAKMSR(r13) | |
1071 | mtspr SPRN_SRR1,r10 | |
1072 | rfid | |
1073 | b . | |
1074 | ||
1075 | unrecov_slb: | |
1076 | EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) | |
1077 | DISABLE_INTS | |
1078 | bl .save_nvgprs | |
1079 | 1: addi r3,r1,STACK_FRAME_OVERHEAD | |
1080 | bl .unrecoverable_exception | |
1081 | b 1b | |
1082 | ||
0ebc4cda BH |
1083 | |
1084 | #ifdef CONFIG_PPC_970_NAP | |
1085 | power4_fixup_nap: | |
1086 | andc r9,r9,r10 | |
1087 | std r9,TI_LOCAL_FLAGS(r11) | |
1088 | ld r10,_LINK(r1) /* make idle task do the */ | |
1089 | std r10,_NIP(r1) /* equivalent of a blr */ | |
1090 | blr | |
1091 | #endif | |
1092 | ||
1093 | .align 7 | |
1094 | .globl alignment_common | |
1095 | alignment_common: | |
1096 | mfspr r10,SPRN_DAR | |
1097 | std r10,PACA_EXGEN+EX_DAR(r13) | |
1098 | mfspr r10,SPRN_DSISR | |
1099 | stw r10,PACA_EXGEN+EX_DSISR(r13) | |
1100 | EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) | |
1101 | ld r3,PACA_EXGEN+EX_DAR(r13) | |
1102 | lwz r4,PACA_EXGEN+EX_DSISR(r13) | |
1103 | std r3,_DAR(r1) | |
1104 | std r4,_DSISR(r1) | |
1105 | bl .save_nvgprs | |
a3512b2d | 1106 | DISABLE_INTS |
0ebc4cda | 1107 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
1108 | bl .alignment_exception |
1109 | b .ret_from_except | |
1110 | ||
1111 | .align 7 | |
1112 | .globl program_check_common | |
1113 | program_check_common: | |
1114 | EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) | |
1115 | bl .save_nvgprs | |
54321242 | 1116 | DISABLE_INTS |
922b9f86 | 1117 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
1118 | bl .program_check_exception |
1119 | b .ret_from_except | |
1120 | ||
1121 | .align 7 | |
1122 | .globl fp_unavailable_common | |
1123 | fp_unavailable_common: | |
1124 | EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) | |
1125 | bne 1f /* if from user, just load it up */ | |
1126 | bl .save_nvgprs | |
9f2f79e3 | 1127 | DISABLE_INTS |
0ebc4cda | 1128 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
1129 | bl .kernel_fp_unavailable_exception |
1130 | BUG_OPCODE | |
1131 | 1: bl .load_up_fpu | |
1132 | b fast_exception_return | |
1133 | ||
1134 | .align 7 | |
1135 | .globl altivec_unavailable_common | |
1136 | altivec_unavailable_common: | |
1137 | EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) | |
1138 | #ifdef CONFIG_ALTIVEC | |
1139 | BEGIN_FTR_SECTION | |
1140 | beq 1f | |
1141 | bl .load_up_altivec | |
1142 | b fast_exception_return | |
1143 | 1: | |
1144 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
1145 | #endif | |
1146 | bl .save_nvgprs | |
9f2f79e3 | 1147 | DISABLE_INTS |
0ebc4cda | 1148 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
1149 | bl .altivec_unavailable_exception |
1150 | b .ret_from_except | |
1151 | ||
1152 | .align 7 | |
1153 | .globl vsx_unavailable_common | |
1154 | vsx_unavailable_common: | |
1155 | EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) | |
1156 | #ifdef CONFIG_VSX | |
1157 | BEGIN_FTR_SECTION | |
7230c564 BH |
1158 | beq 1f |
1159 | b .load_up_vsx | |
0ebc4cda BH |
1160 | 1: |
1161 | END_FTR_SECTION_IFSET(CPU_FTR_VSX) | |
1162 | #endif | |
1163 | bl .save_nvgprs | |
9f2f79e3 | 1164 | DISABLE_INTS |
0ebc4cda | 1165 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
1166 | bl .vsx_unavailable_exception |
1167 | b .ret_from_except | |
1168 | ||
1169 | .align 7 | |
1170 | .globl __end_handlers | |
1171 | __end_handlers: | |
1172 | ||
61383407 BH |
1173 | /* Equivalents to the above handlers for relocation-on interrupt vectors */ |
1174 | STD_RELON_EXCEPTION_HV(., 0xe00, h_data_storage) | |
1175 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe00) | |
1176 | STD_RELON_EXCEPTION_HV(., 0xe20, h_instr_storage) | |
1177 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe20) | |
1178 | STD_RELON_EXCEPTION_HV(., 0xe40, emulation_assist) | |
1179 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe40) | |
1180 | STD_RELON_EXCEPTION_HV(., 0xe60, hmi_exception) | |
1181 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe60) | |
1182 | MASKABLE_RELON_EXCEPTION_HV(., 0xe80, h_doorbell) | |
1183 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe80) | |
1184 | ||
1185 | STD_RELON_EXCEPTION_PSERIES(., 0xf00, performance_monitor) | |
1186 | STD_RELON_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable) | |
1187 | STD_RELON_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable) | |
1188 | ||
1189 | #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) | |
1190 | /* | |
1191 | * Data area reserved for FWNMI option. | |
1192 | * This address (0x7000) is fixed by the RPA. | |
1193 | */ | |
1194 | .= 0x7000 | |
1195 | .globl fwnmi_data_area | |
1196 | fwnmi_data_area: | |
1197 | ||
1198 | /* pseries and powernv need to keep the whole page from | |
1199 | * 0x7000 to 0x8000 free for use by the firmware | |
1200 | */ | |
1201 | . = 0x8000 | |
1202 | #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */ | |
1203 | ||
1204 | /* Space for CPU0's segment table */ | |
1205 | .balign 4096 | |
1206 | .globl initial_stab | |
1207 | initial_stab: | |
1208 | .space 4096 | |
1209 | ||
1210 | #ifdef CONFIG_PPC_POWERNV | |
1211 | _GLOBAL(opal_mc_secondary_handler) | |
1212 | HMT_MEDIUM_PPR_DISCARD | |
1213 | SET_SCRATCH0(r13) | |
1214 | GET_PACA(r13) | |
1215 | clrldi r3,r3,2 | |
1216 | tovirt(r3,r3) | |
1217 | std r3,PACA_OPAL_MC_EVT(r13) | |
1218 | ld r13,OPAL_MC_SRR0(r3) | |
1219 | mtspr SPRN_SRR0,r13 | |
1220 | ld r13,OPAL_MC_SRR1(r3) | |
1221 | mtspr SPRN_SRR1,r13 | |
1222 | ld r3,OPAL_MC_GPR3(r3) | |
1223 | GET_SCRATCH0(r13) | |
1224 | b machine_check_pSeries | |
1225 | #endif /* CONFIG_PPC_POWERNV */ | |
1226 | ||
1227 | ||
0ebc4cda BH |
1228 | /* |
1229 | * Hash table stuff | |
1230 | */ | |
1231 | .align 7 | |
1232 | _STATIC(do_hash_page) | |
1233 | std r3,_DAR(r1) | |
1234 | std r4,_DSISR(r1) | |
1235 | ||
9c7cc234 | 1236 | andis. r0,r4,0xa410 /* weird error? */ |
0ebc4cda | 1237 | bne- handle_page_fault /* if not, try to insert a HPTE */ |
9c7cc234 P |
1238 | andis. r0,r4,DSISR_DABRMATCH@h |
1239 | bne- handle_dabr_fault | |
1240 | ||
0ebc4cda BH |
1241 | BEGIN_FTR_SECTION |
1242 | andis. r0,r4,0x0020 /* Is it a segment table fault? */ | |
1243 | bne- do_ste_alloc /* If so handle it */ | |
44ae3ab3 | 1244 | END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB) |
0ebc4cda | 1245 | |
9778b696 | 1246 | CURRENT_THREAD_INFO(r11, r1) |
9c1e1052 PM |
1247 | lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */ |
1248 | andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */ | |
1249 | bne 77f /* then don't call hash_page now */ | |
0ebc4cda BH |
1250 | /* |
1251 | * We need to set the _PAGE_USER bit if MSR_PR is set or if we are | |
1252 | * accessing a userspace segment (even from the kernel). We assume | |
1253 | * kernel addresses always have the high bit set. | |
1254 | */ | |
1255 | rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */ | |
1256 | rotldi r0,r3,15 /* Move high bit into MSR_PR posn */ | |
1257 | orc r0,r12,r0 /* MSR_PR | ~high_bit */ | |
1258 | rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */ | |
1259 | ori r4,r4,1 /* add _PAGE_PRESENT */ | |
1260 | rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */ | |
1261 | ||
1262 | /* | |
1263 | * r3 contains the faulting address | |
1264 | * r4 contains the required access permissions | |
1265 | * r5 contains the trap number | |
1266 | * | |
7230c564 | 1267 | * at return r3 = 0 for success, 1 for page fault, negative for error |
0ebc4cda BH |
1268 | */ |
1269 | bl .hash_page /* build HPTE if possible */ | |
1270 | cmpdi r3,0 /* see if hash_page succeeded */ | |
1271 | ||
7230c564 | 1272 | /* Success */ |
0ebc4cda | 1273 | beq fast_exc_return_irq /* Return from exception on success */ |
0ebc4cda | 1274 | |
7230c564 BH |
1275 | /* Error */ |
1276 | blt- 13f | |
9c7cc234 | 1277 | |
0ebc4cda BH |
1278 | /* Here we have a page fault that hash_page can't handle. */ |
1279 | handle_page_fault: | |
0ebc4cda BH |
1280 | 11: ld r4,_DAR(r1) |
1281 | ld r5,_DSISR(r1) | |
1282 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1283 | bl .do_page_fault | |
1284 | cmpdi r3,0 | |
a546498f | 1285 | beq+ 12f |
0ebc4cda BH |
1286 | bl .save_nvgprs |
1287 | mr r5,r3 | |
1288 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1289 | lwz r4,_DAR(r1) | |
1290 | bl .bad_page_fault | |
1291 | b .ret_from_except | |
1292 | ||
a546498f BH |
1293 | /* We have a data breakpoint exception - handle it */ |
1294 | handle_dabr_fault: | |
1295 | bl .save_nvgprs | |
1296 | ld r4,_DAR(r1) | |
1297 | ld r5,_DSISR(r1) | |
1298 | addi r3,r1,STACK_FRAME_OVERHEAD | |
9422de3e | 1299 | bl .do_break |
a546498f BH |
1300 | 12: b .ret_from_except_lite |
1301 | ||
0ebc4cda BH |
1302 | |
1303 | /* We have a page fault that hash_page could handle but HV refused | |
1304 | * the PTE insertion | |
1305 | */ | |
a546498f | 1306 | 13: bl .save_nvgprs |
0ebc4cda BH |
1307 | mr r5,r3 |
1308 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1309 | ld r4,_DAR(r1) | |
1310 | bl .low_hash_fault | |
1311 | b .ret_from_except | |
1312 | ||
9c1e1052 PM |
1313 | /* |
1314 | * We come here as a result of a DSI at a point where we don't want | |
1315 | * to call hash_page, such as when we are accessing memory (possibly | |
1316 | * user memory) inside a PMU interrupt that occurred while interrupts | |
1317 | * were soft-disabled. We want to invoke the exception handler for | |
1318 | * the access, or panic if there isn't a handler. | |
1319 | */ | |
1320 | 77: bl .save_nvgprs | |
1321 | mr r4,r3 | |
1322 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1323 | li r5,SIGSEGV | |
1324 | bl .bad_page_fault | |
1325 | b .ret_from_except | |
1326 | ||
0ebc4cda BH |
1327 | /* here we have a segment miss */ |
1328 | do_ste_alloc: | |
1329 | bl .ste_allocate /* try to insert stab entry */ | |
1330 | cmpdi r3,0 | |
1331 | bne- handle_page_fault | |
1332 | b fast_exception_return | |
1333 | ||
1334 | /* | |
1335 | * r13 points to the PACA, r9 contains the saved CR, | |
1336 | * r11 and r12 contain the saved SRR0 and SRR1. | |
1337 | * r9 - r13 are saved in paca->exslb. | |
1338 | * We assume we aren't going to take any exceptions during this procedure. | |
1339 | * We assume (DAR >> 60) == 0xc. | |
1340 | */ | |
1341 | .align 7 | |
1342 | _GLOBAL(do_stab_bolted) | |
1343 | stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ | |
1344 | std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */ | |
1345 | ||
1346 | /* Hash to the primary group */ | |
1347 | ld r10,PACASTABVIRT(r13) | |
1348 | mfspr r11,SPRN_DAR | |
1349 | srdi r11,r11,28 | |
1350 | rldimi r10,r11,7,52 /* r10 = first ste of the group */ | |
1351 | ||
1352 | /* Calculate VSID */ | |
048ee099 AK |
1353 | /* This is a kernel address, so protovsid = ESID | 1 << 37 */ |
1354 | li r9,0x1 | |
1355 | rldimi r11,r9,(CONTEXT_BITS + USER_ESID_BITS),0 | |
0ebc4cda BH |
1356 | ASM_VSID_SCRAMBLE(r11, r9, 256M) |
1357 | rldic r9,r11,12,16 /* r9 = vsid << 12 */ | |
1358 | ||
1359 | /* Search the primary group for a free entry */ | |
1360 | 1: ld r11,0(r10) /* Test valid bit of the current ste */ | |
1361 | andi. r11,r11,0x80 | |
1362 | beq 2f | |
1363 | addi r10,r10,16 | |
1364 | andi. r11,r10,0x70 | |
1365 | bne 1b | |
1366 | ||
1367 | /* Stick for only searching the primary group for now. */ | |
1368 | /* At least for now, we use a very simple random castout scheme */ | |
1369 | /* Use the TB as a random number ; OR in 1 to avoid entry 0 */ | |
1370 | mftb r11 | |
1371 | rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */ | |
1372 | ori r11,r11,0x10 | |
1373 | ||
1374 | /* r10 currently points to an ste one past the group of interest */ | |
1375 | /* make it point to the randomly selected entry */ | |
1376 | subi r10,r10,128 | |
1377 | or r10,r10,r11 /* r10 is the entry to invalidate */ | |
1378 | ||
1379 | isync /* mark the entry invalid */ | |
1380 | ld r11,0(r10) | |
1381 | rldicl r11,r11,56,1 /* clear the valid bit */ | |
1382 | rotldi r11,r11,8 | |
1383 | std r11,0(r10) | |
1384 | sync | |
1385 | ||
1386 | clrrdi r11,r11,28 /* Get the esid part of the ste */ | |
1387 | slbie r11 | |
1388 | ||
1389 | 2: std r9,8(r10) /* Store the vsid part of the ste */ | |
1390 | eieio | |
1391 | ||
1392 | mfspr r11,SPRN_DAR /* Get the new esid */ | |
1393 | clrrdi r11,r11,28 /* Permits a full 32b of ESID */ | |
1394 | ori r11,r11,0x90 /* Turn on valid and kp */ | |
1395 | std r11,0(r10) /* Put new entry back into the stab */ | |
1396 | ||
1397 | sync | |
1398 | ||
1399 | /* All done -- return from exception. */ | |
1400 | lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ | |
1401 | ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */ | |
1402 | ||
1403 | andi. r10,r12,MSR_RI | |
1404 | beq- unrecov_slb | |
1405 | ||
1406 | mtcrf 0x80,r9 /* restore CR */ | |
1407 | ||
1408 | mfmsr r10 | |
1409 | clrrdi r10,r10,2 | |
1410 | mtmsrd r10,1 | |
1411 | ||
1412 | mtspr SPRN_SRR0,r11 | |
1413 | mtspr SPRN_SRR1,r12 | |
1414 | ld r9,PACA_EXSLB+EX_R9(r13) | |
1415 | ld r10,PACA_EXSLB+EX_R10(r13) | |
1416 | ld r11,PACA_EXSLB+EX_R11(r13) | |
1417 | ld r12,PACA_EXSLB+EX_R12(r13) | |
1418 | ld r13,PACA_EXSLB+EX_R13(r13) | |
1419 | rfid | |
1420 | b . /* prevent speculative execution */ |