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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 | |
22 | * 0x0100 - 0x2fff : pSeries Interrupt prologs | |
4f8cf36f | 23 | * 0x3000 - 0x5fff : interrupt support common interrupt prologs |
0ebc4cda BH |
24 | * 0x6000 - 0x6fff : Initial (CPU0) segment table |
25 | * 0x7000 - 0x7fff : FWNMI data area | |
26 | * 0x8000 - : Early init and support code | |
27 | */ | |
28 | ||
0ebc4cda BH |
29 | /* |
30 | * This is the start of the interrupt handlers for pSeries | |
31 | * This code runs with relocation off. | |
32 | * Code from here to __end_interrupts gets copied down to real | |
33 | * address 0x100 when we are running a relocatable kernel. | |
34 | * Therefore any relative branches in this section must only | |
35 | * branch to labels in this section. | |
36 | */ | |
37 | . = 0x100 | |
38 | .globl __start_interrupts | |
39 | __start_interrupts: | |
40 | ||
948cf67c BH |
41 | .globl system_reset_pSeries; |
42 | system_reset_pSeries: | |
43 | HMT_MEDIUM; | |
948cf67c BH |
44 | SET_SCRATCH0(r13) |
45 | #ifdef CONFIG_PPC_P7_NAP | |
46 | BEGIN_FTR_SECTION | |
47 | /* Running native on arch 2.06 or later, check if we are | |
48 | * waking up from nap. We only handle no state loss and | |
49 | * supervisor state loss. We do -not- handle hypervisor | |
50 | * state loss at this time. | |
51 | */ | |
52 | mfspr r13,SPRN_SRR1 | |
371fefd6 PM |
53 | rlwinm. r13,r13,47-31,30,31 |
54 | beq 9f | |
55 | ||
56 | /* waking up from powersave (nap) state */ | |
57 | cmpwi cr1,r13,2 | |
948cf67c BH |
58 | /* Total loss of HV state is fatal, we could try to use the |
59 | * PIR to locate a PACA, then use an emergency stack etc... | |
60 | * but for now, let's just stay stuck here | |
61 | */ | |
371fefd6 PM |
62 | bgt cr1,. |
63 | GET_PACA(r13) | |
64 | ||
65 | #ifdef CONFIG_KVM_BOOK3S_64_HV | |
f0888f70 PM |
66 | li r0,KVM_HWTHREAD_IN_KERNEL |
67 | stb r0,HSTATE_HWTHREAD_STATE(r13) | |
68 | /* Order setting hwthread_state vs. testing hwthread_req */ | |
69 | sync | |
70 | lbz r0,HSTATE_HWTHREAD_REQ(r13) | |
71 | cmpwi r0,0 | |
72 | beq 1f | |
371fefd6 PM |
73 | b kvm_start_guest |
74 | 1: | |
75 | #endif | |
76 | ||
77 | beq cr1,2f | |
78 | b .power7_wakeup_noloss | |
79 | 2: b .power7_wakeup_loss | |
80 | 9: | |
969391c5 | 81 | END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) |
948cf67c | 82 | #endif /* CONFIG_PPC_P7_NAP */ |
b01c8b54 PM |
83 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD, |
84 | NOTEST, 0x100) | |
0ebc4cda BH |
85 | |
86 | . = 0x200 | |
b01c8b54 PM |
87 | machine_check_pSeries_1: |
88 | /* This is moved out of line as it can be patched by FW, but | |
89 | * some code path might still want to branch into the original | |
90 | * vector | |
91 | */ | |
92 | b machine_check_pSeries | |
0ebc4cda BH |
93 | |
94 | . = 0x300 | |
95 | .globl data_access_pSeries | |
96 | data_access_pSeries: | |
97 | HMT_MEDIUM | |
673b189a | 98 | SET_SCRATCH0(r13) |
0ebc4cda | 99 | BEGIN_FTR_SECTION |
b01c8b54 PM |
100 | b data_access_check_stab |
101 | data_access_not_stab: | |
102 | END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB) | |
b01c8b54 | 103 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD, |
697d3899 | 104 | KVMTEST, 0x300) |
0ebc4cda BH |
105 | |
106 | . = 0x380 | |
107 | .globl data_access_slb_pSeries | |
108 | data_access_slb_pSeries: | |
109 | HMT_MEDIUM | |
673b189a | 110 | SET_SCRATCH0(r13) |
697d3899 | 111 | EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380) |
0ebc4cda BH |
112 | std r3,PACA_EXSLB+EX_R3(r13) |
113 | mfspr r3,SPRN_DAR | |
0ebc4cda BH |
114 | #ifdef __DISABLED__ |
115 | /* Keep that around for when we re-implement dynamic VSIDs */ | |
116 | cmpdi r3,0 | |
117 | bge slb_miss_user_pseries | |
118 | #endif /* __DISABLED__ */ | |
b01c8b54 | 119 | mfspr r12,SPRN_SRR1 |
0ebc4cda BH |
120 | #ifndef CONFIG_RELOCATABLE |
121 | b .slb_miss_realmode | |
122 | #else | |
123 | /* | |
124 | * We can't just use a direct branch to .slb_miss_realmode | |
125 | * because the distance from here to there depends on where | |
126 | * the kernel ends up being put. | |
127 | */ | |
128 | mfctr r11 | |
129 | ld r10,PACAKBASE(r13) | |
130 | LOAD_HANDLER(r10, .slb_miss_realmode) | |
131 | mtctr r10 | |
132 | bctr | |
133 | #endif | |
134 | ||
b3e6b5df | 135 | STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access) |
0ebc4cda BH |
136 | |
137 | . = 0x480 | |
138 | .globl instruction_access_slb_pSeries | |
139 | instruction_access_slb_pSeries: | |
140 | HMT_MEDIUM | |
673b189a | 141 | SET_SCRATCH0(r13) |
de56a948 | 142 | EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480) |
0ebc4cda BH |
143 | std r3,PACA_EXSLB+EX_R3(r13) |
144 | mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ | |
0ebc4cda BH |
145 | #ifdef __DISABLED__ |
146 | /* Keep that around for when we re-implement dynamic VSIDs */ | |
147 | cmpdi r3,0 | |
148 | bge slb_miss_user_pseries | |
149 | #endif /* __DISABLED__ */ | |
b01c8b54 | 150 | mfspr r12,SPRN_SRR1 |
0ebc4cda BH |
151 | #ifndef CONFIG_RELOCATABLE |
152 | b .slb_miss_realmode | |
153 | #else | |
154 | mfctr r11 | |
155 | ld r10,PACAKBASE(r13) | |
156 | LOAD_HANDLER(r10, .slb_miss_realmode) | |
157 | mtctr r10 | |
158 | bctr | |
159 | #endif | |
160 | ||
b3e6b5df BH |
161 | /* We open code these as we can't have a ". = x" (even with |
162 | * x = "." within a feature section | |
163 | */ | |
a5d4f3ad | 164 | . = 0x500; |
b3e6b5df BH |
165 | .globl hardware_interrupt_pSeries; |
166 | .globl hardware_interrupt_hv; | |
a5d4f3ad | 167 | hardware_interrupt_pSeries: |
b3e6b5df | 168 | hardware_interrupt_hv: |
a5d4f3ad | 169 | BEGIN_FTR_SECTION |
b01c8b54 PM |
170 | _MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt, |
171 | EXC_HV, SOFTEN_TEST_HV) | |
172 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502) | |
de56a948 PM |
173 | FTR_SECTION_ELSE |
174 | _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt, | |
9e368f29 | 175 | EXC_STD, SOFTEN_TEST_HV_201) |
de56a948 | 176 | KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500) |
969391c5 | 177 | ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) |
a5d4f3ad | 178 | |
b3e6b5df | 179 | STD_EXCEPTION_PSERIES(0x600, 0x600, alignment) |
de56a948 | 180 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600) |
b01c8b54 | 181 | |
b3e6b5df | 182 | STD_EXCEPTION_PSERIES(0x700, 0x700, program_check) |
de56a948 | 183 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700) |
b01c8b54 | 184 | |
b3e6b5df | 185 | STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable) |
de56a948 | 186 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800) |
a5d4f3ad | 187 | |
b3e6b5df | 188 | MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer) |
b01c8b54 | 189 | MASKABLE_EXCEPTION_HV(0x980, 0x982, decrementer) |
a5d4f3ad | 190 | |
b3e6b5df | 191 | STD_EXCEPTION_PSERIES(0xa00, 0xa00, trap_0a) |
de56a948 | 192 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00) |
b01c8b54 | 193 | |
b3e6b5df | 194 | STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b) |
de56a948 | 195 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00) |
0ebc4cda BH |
196 | |
197 | . = 0xc00 | |
198 | .globl system_call_pSeries | |
199 | system_call_pSeries: | |
200 | HMT_MEDIUM | |
b01c8b54 PM |
201 | #ifdef CONFIG_KVM_BOOK3S_64_HANDLER |
202 | SET_SCRATCH0(r13) | |
203 | GET_PACA(r13) | |
204 | std r9,PACA_EXGEN+EX_R9(r13) | |
205 | std r10,PACA_EXGEN+EX_R10(r13) | |
206 | mfcr r9 | |
207 | KVMTEST(0xc00) | |
208 | GET_SCRATCH0(r13) | |
209 | #endif | |
0ebc4cda BH |
210 | BEGIN_FTR_SECTION |
211 | cmpdi r0,0x1ebe | |
212 | beq- 1f | |
213 | END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) | |
214 | mr r9,r13 | |
2dd60d79 | 215 | GET_PACA(r13) |
0ebc4cda | 216 | mfspr r11,SPRN_SRR0 |
0ebc4cda | 217 | mfspr r12,SPRN_SRR1 |
f5f0307f AB |
218 | ld r10,PACAKBASE(r13) |
219 | LOAD_HANDLER(r10, system_call_entry) | |
220 | mtspr SPRN_SRR0,r10 | |
221 | ld r10,PACAKMSR(r13) | |
0ebc4cda BH |
222 | mtspr SPRN_SRR1,r10 |
223 | rfid | |
224 | b . /* prevent speculative execution */ | |
225 | ||
b01c8b54 PM |
226 | KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00) |
227 | ||
0ebc4cda BH |
228 | /* Fast LE/BE switch system call */ |
229 | 1: mfspr r12,SPRN_SRR1 | |
230 | xori r12,r12,MSR_LE | |
231 | mtspr SPRN_SRR1,r12 | |
232 | rfid /* return to userspace */ | |
233 | b . | |
234 | ||
b3e6b5df | 235 | STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step) |
de56a948 | 236 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00) |
b3e6b5df BH |
237 | |
238 | /* At 0xe??? we have a bunch of hypervisor exceptions, we branch | |
239 | * out of line to handle them | |
240 | */ | |
241 | . = 0xe00 | |
242 | b h_data_storage_hv | |
243 | . = 0xe20 | |
244 | b h_instr_storage_hv | |
245 | . = 0xe40 | |
246 | b emulation_assist_hv | |
247 | . = 0xe50 | |
248 | b hmi_exception_hv | |
249 | . = 0xe60 | |
250 | b hmi_exception_hv | |
0ebc4cda BH |
251 | |
252 | /* We need to deal with the Altivec unavailable exception | |
253 | * here which is at 0xf20, thus in the middle of the | |
254 | * prolog code of the PerformanceMonitor one. A little | |
255 | * trickery is thus necessary | |
256 | */ | |
c86e2ead | 257 | performance_monitor_pSeries_1: |
0ebc4cda BH |
258 | . = 0xf00 |
259 | b performance_monitor_pSeries | |
260 | ||
c86e2ead | 261 | altivec_unavailable_pSeries_1: |
0ebc4cda BH |
262 | . = 0xf20 |
263 | b altivec_unavailable_pSeries | |
264 | ||
c86e2ead | 265 | vsx_unavailable_pSeries_1: |
0ebc4cda BH |
266 | . = 0xf40 |
267 | b vsx_unavailable_pSeries | |
268 | ||
269 | #ifdef CONFIG_CBE_RAS | |
b3e6b5df | 270 | STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error) |
5ccf55dd | 271 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202) |
0ebc4cda | 272 | #endif /* CONFIG_CBE_RAS */ |
b01c8b54 | 273 | |
b3e6b5df | 274 | STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint) |
de56a948 | 275 | KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300) |
b01c8b54 | 276 | |
0ebc4cda | 277 | #ifdef CONFIG_CBE_RAS |
b3e6b5df | 278 | STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance) |
5ccf55dd | 279 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602) |
0ebc4cda | 280 | #endif /* CONFIG_CBE_RAS */ |
b01c8b54 | 281 | |
b3e6b5df | 282 | STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist) |
de56a948 | 283 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700) |
b01c8b54 | 284 | |
0ebc4cda | 285 | #ifdef CONFIG_CBE_RAS |
b3e6b5df | 286 | STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal) |
5ccf55dd | 287 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802) |
0ebc4cda BH |
288 | #endif /* CONFIG_CBE_RAS */ |
289 | ||
290 | . = 0x3000 | |
291 | ||
b3e6b5df BH |
292 | /*** Out of line interrupts support ***/ |
293 | ||
b01c8b54 PM |
294 | /* moved from 0x200 */ |
295 | machine_check_pSeries: | |
296 | .globl machine_check_fwnmi | |
297 | machine_check_fwnmi: | |
298 | HMT_MEDIUM | |
299 | SET_SCRATCH0(r13) /* save r13 */ | |
300 | EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common, | |
301 | EXC_STD, KVMTEST, 0x200) | |
302 | KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200) | |
303 | ||
b01c8b54 PM |
304 | /* moved from 0x300 */ |
305 | data_access_check_stab: | |
306 | GET_PACA(r13) | |
307 | std r9,PACA_EXSLB+EX_R9(r13) | |
308 | std r10,PACA_EXSLB+EX_R10(r13) | |
309 | mfspr r10,SPRN_DAR | |
310 | mfspr r9,SPRN_DSISR | |
311 | srdi r10,r10,60 | |
312 | rlwimi r10,r9,16,0x20 | |
de56a948 | 313 | #ifdef CONFIG_KVM_BOOK3S_PR |
3c42bf8a | 314 | lbz r9,HSTATE_IN_GUEST(r13) |
b01c8b54 PM |
315 | rlwimi r10,r9,8,0x300 |
316 | #endif | |
317 | mfcr r9 | |
318 | cmpwi r10,0x2c | |
319 | beq do_stab_bolted_pSeries | |
320 | mtcrf 0x80,r9 | |
321 | ld r9,PACA_EXSLB+EX_R9(r13) | |
322 | ld r10,PACA_EXSLB+EX_R10(r13) | |
323 | b data_access_not_stab | |
324 | do_stab_bolted_pSeries: | |
325 | std r11,PACA_EXSLB+EX_R11(r13) | |
326 | std r12,PACA_EXSLB+EX_R12(r13) | |
327 | GET_SCRATCH0(r10) | |
328 | std r10,PACA_EXSLB+EX_R13(r13) | |
329 | EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD) | |
b01c8b54 | 330 | |
697d3899 PM |
331 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300) |
332 | KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380) | |
de56a948 PM |
333 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400) |
334 | KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480) | |
335 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900) | |
b01c8b54 PM |
336 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982) |
337 | ||
338 | .align 7 | |
b3e6b5df | 339 | /* moved from 0xe00 */ |
b01c8b54 PM |
340 | STD_EXCEPTION_HV(., 0xe02, h_data_storage) |
341 | KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02) | |
342 | STD_EXCEPTION_HV(., 0xe22, h_instr_storage) | |
343 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22) | |
344 | STD_EXCEPTION_HV(., 0xe42, emulation_assist) | |
345 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42) | |
346 | STD_EXCEPTION_HV(., 0xe62, hmi_exception) /* need to flush cache ? */ | |
347 | KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62) | |
0ebc4cda BH |
348 | |
349 | /* moved from 0xf00 */ | |
b3e6b5df | 350 | STD_EXCEPTION_PSERIES(., 0xf00, performance_monitor) |
de56a948 | 351 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00) |
b3e6b5df | 352 | STD_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable) |
de56a948 | 353 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20) |
b3e6b5df | 354 | STD_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable) |
de56a948 | 355 | KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40) |
0ebc4cda BH |
356 | |
357 | /* | |
7230c564 BH |
358 | * An interrupt came in while soft-disabled. We set paca->irq_happened, |
359 | * then, if it was a decrementer interrupt, we bump the dec to max and | |
360 | * and return, else we hard disable and return. This is called with | |
361 | * r10 containing the value to OR to the paca field. | |
0ebc4cda | 362 | */ |
7230c564 BH |
363 | #define MASKED_INTERRUPT(_H) \ |
364 | masked_##_H##interrupt: \ | |
365 | std r11,PACA_EXGEN+EX_R11(r13); \ | |
366 | lbz r11,PACAIRQHAPPENED(r13); \ | |
367 | or r11,r11,r10; \ | |
368 | stb r11,PACAIRQHAPPENED(r13); \ | |
369 | andi. r10,r10,PACA_IRQ_DEC; \ | |
370 | beq 1f; \ | |
371 | lis r10,0x7fff; \ | |
372 | ori r10,r10,0xffff; \ | |
373 | mtspr SPRN_DEC,r10; \ | |
374 | b 2f; \ | |
375 | 1: mfspr r10,SPRN_##_H##SRR1; \ | |
376 | rldicl r10,r10,48,1; /* clear MSR_EE */ \ | |
377 | rotldi r10,r10,16; \ | |
378 | mtspr SPRN_##_H##SRR1,r10; \ | |
379 | 2: mtcrf 0x80,r9; \ | |
380 | ld r9,PACA_EXGEN+EX_R9(r13); \ | |
381 | ld r10,PACA_EXGEN+EX_R10(r13); \ | |
382 | ld r11,PACA_EXGEN+EX_R11(r13); \ | |
383 | GET_SCRATCH0(r13); \ | |
384 | ##_H##rfid; \ | |
0ebc4cda | 385 | b . |
7230c564 BH |
386 | |
387 | MASKED_INTERRUPT() | |
388 | MASKED_INTERRUPT(H) | |
0ebc4cda | 389 | |
7230c564 BH |
390 | /* |
391 | * Called from arch_local_irq_enable when an interrupt needs | |
392 | * to be resent. r3 contains 0x500 or 0x900 to indicate which | |
393 | * kind of interrupt. MSR:EE is already off. We generate a | |
394 | * stackframe like if a real interrupt had happened. | |
395 | * | |
396 | * Note: While MSR:EE is off, we need to make sure that _MSR | |
397 | * in the generated frame has EE set to 1 or the exception | |
398 | * handler will not properly re-enable them. | |
399 | */ | |
400 | _GLOBAL(__replay_interrupt) | |
401 | /* We are going to jump to the exception common code which | |
402 | * will retrieve various register values from the PACA which | |
403 | * we don't give a damn about, so we don't bother storing them. | |
404 | */ | |
405 | mfmsr r12 | |
406 | mflr r11 | |
407 | mfcr r9 | |
408 | ori r12,r12,MSR_EE | |
409 | andi. r3,r3,0x0800 | |
410 | bne decrementer_common | |
411 | b hardware_interrupt_common | |
a5d4f3ad | 412 | |
0ebc4cda BH |
413 | #ifdef CONFIG_PPC_PSERIES |
414 | /* | |
415 | * Vectors for the FWNMI option. Share common code. | |
416 | */ | |
417 | .globl system_reset_fwnmi | |
418 | .align 7 | |
419 | system_reset_fwnmi: | |
420 | HMT_MEDIUM | |
673b189a | 421 | SET_SCRATCH0(r13) /* save r13 */ |
b01c8b54 PM |
422 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD, |
423 | NOTEST, 0x100) | |
0ebc4cda BH |
424 | |
425 | #endif /* CONFIG_PPC_PSERIES */ | |
426 | ||
427 | #ifdef __DISABLED__ | |
428 | /* | |
429 | * This is used for when the SLB miss handler has to go virtual, | |
430 | * which doesn't happen for now anymore but will once we re-implement | |
431 | * dynamic VSIDs for shared page tables | |
432 | */ | |
433 | slb_miss_user_pseries: | |
434 | std r10,PACA_EXGEN+EX_R10(r13) | |
435 | std r11,PACA_EXGEN+EX_R11(r13) | |
436 | std r12,PACA_EXGEN+EX_R12(r13) | |
673b189a | 437 | GET_SCRATCH0(r10) |
0ebc4cda BH |
438 | ld r11,PACA_EXSLB+EX_R9(r13) |
439 | ld r12,PACA_EXSLB+EX_R3(r13) | |
440 | std r10,PACA_EXGEN+EX_R13(r13) | |
441 | std r11,PACA_EXGEN+EX_R9(r13) | |
442 | std r12,PACA_EXGEN+EX_R3(r13) | |
443 | clrrdi r12,r13,32 | |
444 | mfmsr r10 | |
445 | mfspr r11,SRR0 /* save SRR0 */ | |
446 | ori r12,r12,slb_miss_user_common@l /* virt addr of handler */ | |
447 | ori r10,r10,MSR_IR|MSR_DR|MSR_RI | |
448 | mtspr SRR0,r12 | |
449 | mfspr r12,SRR1 /* and SRR1 */ | |
450 | mtspr SRR1,r10 | |
451 | rfid | |
452 | b . /* prevent spec. execution */ | |
453 | #endif /* __DISABLED__ */ | |
454 | ||
455 | .align 7 | |
456 | .globl __end_interrupts | |
457 | __end_interrupts: | |
458 | ||
459 | /* | |
460 | * Code from here down to __end_handlers is invoked from the | |
461 | * exception prologs above. Because the prologs assemble the | |
462 | * addresses of these handlers using the LOAD_HANDLER macro, | |
463 | * which uses an addi instruction, these handlers must be in | |
464 | * the first 32k of the kernel image. | |
465 | */ | |
466 | ||
467 | /*** Common interrupt handlers ***/ | |
468 | ||
469 | STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception) | |
470 | ||
471 | /* | |
472 | * Machine check is different because we use a different | |
473 | * save area: PACA_EXMC instead of PACA_EXGEN. | |
474 | */ | |
475 | .align 7 | |
476 | .globl machine_check_common | |
477 | machine_check_common: | |
478 | EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) | |
479 | FINISH_NAP | |
480 | DISABLE_INTS | |
481 | bl .save_nvgprs | |
482 | addi r3,r1,STACK_FRAME_OVERHEAD | |
483 | bl .machine_check_exception | |
484 | b .ret_from_except | |
485 | ||
7450f6f0 BH |
486 | STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ) |
487 | STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt) | |
0ebc4cda BH |
488 | STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception) |
489 | STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception) | |
490 | STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception) | |
491 | STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception) | |
b3e6b5df BH |
492 | STD_EXCEPTION_COMMON(0xe40, emulation_assist, .program_check_exception) |
493 | STD_EXCEPTION_COMMON(0xe60, hmi_exception, .unknown_exception) | |
7450f6f0 | 494 | STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, .performance_monitor_exception) |
0ebc4cda BH |
495 | STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception) |
496 | #ifdef CONFIG_ALTIVEC | |
497 | STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception) | |
498 | #else | |
499 | STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception) | |
500 | #endif | |
501 | #ifdef CONFIG_CBE_RAS | |
502 | STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception) | |
503 | STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception) | |
504 | STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception) | |
505 | #endif /* CONFIG_CBE_RAS */ | |
506 | ||
507 | .align 7 | |
508 | system_call_entry: | |
509 | b system_call_common | |
510 | ||
fe1952fc BH |
511 | ppc64_runlatch_on_trampoline: |
512 | b .__ppc64_runlatch_on | |
513 | ||
0ebc4cda BH |
514 | /* |
515 | * Here we have detected that the kernel stack pointer is bad. | |
516 | * R9 contains the saved CR, r13 points to the paca, | |
517 | * r10 contains the (bad) kernel stack pointer, | |
518 | * r11 and r12 contain the saved SRR0 and SRR1. | |
519 | * We switch to using an emergency stack, save the registers there, | |
520 | * and call kernel_bad_stack(), which panics. | |
521 | */ | |
522 | bad_stack: | |
523 | ld r1,PACAEMERGSP(r13) | |
524 | subi r1,r1,64+INT_FRAME_SIZE | |
525 | std r9,_CCR(r1) | |
526 | std r10,GPR1(r1) | |
527 | std r11,_NIP(r1) | |
528 | std r12,_MSR(r1) | |
529 | mfspr r11,SPRN_DAR | |
530 | mfspr r12,SPRN_DSISR | |
531 | std r11,_DAR(r1) | |
532 | std r12,_DSISR(r1) | |
533 | mflr r10 | |
534 | mfctr r11 | |
535 | mfxer r12 | |
536 | std r10,_LINK(r1) | |
537 | std r11,_CTR(r1) | |
538 | std r12,_XER(r1) | |
539 | SAVE_GPR(0,r1) | |
540 | SAVE_GPR(2,r1) | |
1977b502 PM |
541 | ld r10,EX_R3(r3) |
542 | std r10,GPR3(r1) | |
543 | SAVE_GPR(4,r1) | |
544 | SAVE_4GPRS(5,r1) | |
545 | ld r9,EX_R9(r3) | |
546 | ld r10,EX_R10(r3) | |
547 | SAVE_2GPRS(9,r1) | |
548 | ld r9,EX_R11(r3) | |
549 | ld r10,EX_R12(r3) | |
550 | ld r11,EX_R13(r3) | |
551 | std r9,GPR11(r1) | |
552 | std r10,GPR12(r1) | |
553 | std r11,GPR13(r1) | |
48404f2e PM |
554 | BEGIN_FTR_SECTION |
555 | ld r10,EX_CFAR(r3) | |
556 | std r10,ORIG_GPR3(r1) | |
557 | END_FTR_SECTION_IFSET(CPU_FTR_CFAR) | |
1977b502 | 558 | SAVE_8GPRS(14,r1) |
0ebc4cda BH |
559 | SAVE_10GPRS(22,r1) |
560 | lhz r12,PACA_TRAP_SAVE(r13) | |
561 | std r12,_TRAP(r1) | |
562 | addi r11,r1,INT_FRAME_SIZE | |
563 | std r11,0(r1) | |
564 | li r12,0 | |
565 | std r12,0(r11) | |
566 | ld r2,PACATOC(r13) | |
1977b502 PM |
567 | ld r11,exception_marker@toc(r2) |
568 | std r12,RESULT(r1) | |
569 | std r11,STACK_FRAME_OVERHEAD-16(r1) | |
0ebc4cda BH |
570 | 1: addi r3,r1,STACK_FRAME_OVERHEAD |
571 | bl .kernel_bad_stack | |
572 | b 1b | |
573 | ||
574 | /* | |
575 | * Here r13 points to the paca, r9 contains the saved CR, | |
576 | * SRR0 and SRR1 are saved in r11 and r12, | |
577 | * r9 - r13 are saved in paca->exgen. | |
578 | */ | |
579 | .align 7 | |
580 | .globl data_access_common | |
581 | data_access_common: | |
582 | mfspr r10,SPRN_DAR | |
583 | std r10,PACA_EXGEN+EX_DAR(r13) | |
584 | mfspr r10,SPRN_DSISR | |
585 | stw r10,PACA_EXGEN+EX_DSISR(r13) | |
586 | EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) | |
a546498f BH |
587 | DISABLE_INTS |
588 | ld r12,_MSR(r1) | |
0ebc4cda BH |
589 | ld r3,PACA_EXGEN+EX_DAR(r13) |
590 | lwz r4,PACA_EXGEN+EX_DSISR(r13) | |
591 | li r5,0x300 | |
592 | b .do_hash_page /* Try to handle as hpte fault */ | |
593 | ||
b3e6b5df BH |
594 | .align 7 |
595 | .globl h_data_storage_common | |
596 | h_data_storage_common: | |
597 | mfspr r10,SPRN_HDAR | |
598 | std r10,PACA_EXGEN+EX_DAR(r13) | |
599 | mfspr r10,SPRN_HDSISR | |
600 | stw r10,PACA_EXGEN+EX_DSISR(r13) | |
601 | EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN) | |
602 | bl .save_nvgprs | |
a546498f | 603 | DISABLE_INTS |
b3e6b5df BH |
604 | addi r3,r1,STACK_FRAME_OVERHEAD |
605 | bl .unknown_exception | |
606 | b .ret_from_except | |
607 | ||
0ebc4cda BH |
608 | .align 7 |
609 | .globl instruction_access_common | |
610 | instruction_access_common: | |
611 | EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) | |
a546498f BH |
612 | DISABLE_INTS |
613 | ld r12,_MSR(r1) | |
0ebc4cda BH |
614 | ld r3,_NIP(r1) |
615 | andis. r4,r12,0x5820 | |
616 | li r5,0x400 | |
617 | b .do_hash_page /* Try to handle as hpte fault */ | |
618 | ||
b3e6b5df BH |
619 | STD_EXCEPTION_COMMON(0xe20, h_instr_storage, .unknown_exception) |
620 | ||
0ebc4cda BH |
621 | /* |
622 | * Here is the common SLB miss user that is used when going to virtual | |
623 | * mode for SLB misses, that is currently not used | |
624 | */ | |
625 | #ifdef __DISABLED__ | |
626 | .align 7 | |
627 | .globl slb_miss_user_common | |
628 | slb_miss_user_common: | |
629 | mflr r10 | |
630 | std r3,PACA_EXGEN+EX_DAR(r13) | |
631 | stw r9,PACA_EXGEN+EX_CCR(r13) | |
632 | std r10,PACA_EXGEN+EX_LR(r13) | |
633 | std r11,PACA_EXGEN+EX_SRR0(r13) | |
634 | bl .slb_allocate_user | |
635 | ||
636 | ld r10,PACA_EXGEN+EX_LR(r13) | |
637 | ld r3,PACA_EXGEN+EX_R3(r13) | |
638 | lwz r9,PACA_EXGEN+EX_CCR(r13) | |
639 | ld r11,PACA_EXGEN+EX_SRR0(r13) | |
640 | mtlr r10 | |
641 | beq- slb_miss_fault | |
642 | ||
643 | andi. r10,r12,MSR_RI /* check for unrecoverable exception */ | |
644 | beq- unrecov_user_slb | |
645 | mfmsr r10 | |
646 | ||
647 | .machine push | |
648 | .machine "power4" | |
649 | mtcrf 0x80,r9 | |
650 | .machine pop | |
651 | ||
652 | clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */ | |
653 | mtmsrd r10,1 | |
654 | ||
655 | mtspr SRR0,r11 | |
656 | mtspr SRR1,r12 | |
657 | ||
658 | ld r9,PACA_EXGEN+EX_R9(r13) | |
659 | ld r10,PACA_EXGEN+EX_R10(r13) | |
660 | ld r11,PACA_EXGEN+EX_R11(r13) | |
661 | ld r12,PACA_EXGEN+EX_R12(r13) | |
662 | ld r13,PACA_EXGEN+EX_R13(r13) | |
663 | rfid | |
664 | b . | |
665 | ||
666 | slb_miss_fault: | |
667 | EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN) | |
668 | ld r4,PACA_EXGEN+EX_DAR(r13) | |
669 | li r5,0 | |
670 | std r4,_DAR(r1) | |
671 | std r5,_DSISR(r1) | |
672 | b handle_page_fault | |
673 | ||
674 | unrecov_user_slb: | |
675 | EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN) | |
676 | DISABLE_INTS | |
677 | bl .save_nvgprs | |
678 | 1: addi r3,r1,STACK_FRAME_OVERHEAD | |
679 | bl .unrecoverable_exception | |
680 | b 1b | |
681 | ||
682 | #endif /* __DISABLED__ */ | |
683 | ||
684 | ||
685 | /* | |
686 | * r13 points to the PACA, r9 contains the saved CR, | |
687 | * r12 contain the saved SRR1, SRR0 is still ready for return | |
688 | * r3 has the faulting address | |
689 | * r9 - r13 are saved in paca->exslb. | |
690 | * r3 is saved in paca->slb_r3 | |
691 | * We assume we aren't going to take any exceptions during this procedure. | |
692 | */ | |
693 | _GLOBAL(slb_miss_realmode) | |
694 | mflr r10 | |
695 | #ifdef CONFIG_RELOCATABLE | |
696 | mtctr r11 | |
697 | #endif | |
698 | ||
699 | stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ | |
700 | std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ | |
701 | ||
702 | bl .slb_allocate_realmode | |
703 | ||
704 | /* All done -- return from exception. */ | |
705 | ||
706 | ld r10,PACA_EXSLB+EX_LR(r13) | |
707 | ld r3,PACA_EXSLB+EX_R3(r13) | |
708 | lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ | |
0ebc4cda BH |
709 | |
710 | mtlr r10 | |
711 | ||
712 | andi. r10,r12,MSR_RI /* check for unrecoverable exception */ | |
713 | beq- 2f | |
714 | ||
715 | .machine push | |
716 | .machine "power4" | |
717 | mtcrf 0x80,r9 | |
718 | mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ | |
719 | .machine pop | |
720 | ||
0ebc4cda BH |
721 | ld r9,PACA_EXSLB+EX_R9(r13) |
722 | ld r10,PACA_EXSLB+EX_R10(r13) | |
723 | ld r11,PACA_EXSLB+EX_R11(r13) | |
724 | ld r12,PACA_EXSLB+EX_R12(r13) | |
725 | ld r13,PACA_EXSLB+EX_R13(r13) | |
726 | rfid | |
727 | b . /* prevent speculative execution */ | |
728 | ||
4f8cf36f | 729 | 2: mfspr r11,SPRN_SRR0 |
0ebc4cda BH |
730 | ld r10,PACAKBASE(r13) |
731 | LOAD_HANDLER(r10,unrecov_slb) | |
732 | mtspr SPRN_SRR0,r10 | |
733 | ld r10,PACAKMSR(r13) | |
734 | mtspr SPRN_SRR1,r10 | |
735 | rfid | |
736 | b . | |
737 | ||
738 | unrecov_slb: | |
739 | EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) | |
740 | DISABLE_INTS | |
741 | bl .save_nvgprs | |
742 | 1: addi r3,r1,STACK_FRAME_OVERHEAD | |
743 | bl .unrecoverable_exception | |
744 | b 1b | |
745 | ||
0ebc4cda BH |
746 | |
747 | #ifdef CONFIG_PPC_970_NAP | |
748 | power4_fixup_nap: | |
749 | andc r9,r9,r10 | |
750 | std r9,TI_LOCAL_FLAGS(r11) | |
751 | ld r10,_LINK(r1) /* make idle task do the */ | |
752 | std r10,_NIP(r1) /* equivalent of a blr */ | |
753 | blr | |
754 | #endif | |
755 | ||
756 | .align 7 | |
757 | .globl alignment_common | |
758 | alignment_common: | |
759 | mfspr r10,SPRN_DAR | |
760 | std r10,PACA_EXGEN+EX_DAR(r13) | |
761 | mfspr r10,SPRN_DSISR | |
762 | stw r10,PACA_EXGEN+EX_DSISR(r13) | |
763 | EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) | |
764 | ld r3,PACA_EXGEN+EX_DAR(r13) | |
765 | lwz r4,PACA_EXGEN+EX_DSISR(r13) | |
766 | std r3,_DAR(r1) | |
767 | std r4,_DSISR(r1) | |
768 | bl .save_nvgprs | |
a3512b2d | 769 | DISABLE_INTS |
0ebc4cda | 770 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
771 | bl .alignment_exception |
772 | b .ret_from_except | |
773 | ||
774 | .align 7 | |
775 | .globl program_check_common | |
776 | program_check_common: | |
777 | EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) | |
778 | bl .save_nvgprs | |
54321242 | 779 | DISABLE_INTS |
922b9f86 | 780 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
781 | bl .program_check_exception |
782 | b .ret_from_except | |
783 | ||
784 | .align 7 | |
785 | .globl fp_unavailable_common | |
786 | fp_unavailable_common: | |
787 | EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) | |
788 | bne 1f /* if from user, just load it up */ | |
789 | bl .save_nvgprs | |
9f2f79e3 | 790 | DISABLE_INTS |
0ebc4cda | 791 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
792 | bl .kernel_fp_unavailable_exception |
793 | BUG_OPCODE | |
794 | 1: bl .load_up_fpu | |
795 | b fast_exception_return | |
796 | ||
797 | .align 7 | |
798 | .globl altivec_unavailable_common | |
799 | altivec_unavailable_common: | |
800 | EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) | |
801 | #ifdef CONFIG_ALTIVEC | |
802 | BEGIN_FTR_SECTION | |
803 | beq 1f | |
804 | bl .load_up_altivec | |
805 | b fast_exception_return | |
806 | 1: | |
807 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
808 | #endif | |
809 | bl .save_nvgprs | |
9f2f79e3 | 810 | DISABLE_INTS |
0ebc4cda | 811 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
812 | bl .altivec_unavailable_exception |
813 | b .ret_from_except | |
814 | ||
815 | .align 7 | |
816 | .globl vsx_unavailable_common | |
817 | vsx_unavailable_common: | |
818 | EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) | |
819 | #ifdef CONFIG_VSX | |
820 | BEGIN_FTR_SECTION | |
7230c564 BH |
821 | beq 1f |
822 | b .load_up_vsx | |
0ebc4cda BH |
823 | 1: |
824 | END_FTR_SECTION_IFSET(CPU_FTR_VSX) | |
825 | #endif | |
826 | bl .save_nvgprs | |
9f2f79e3 | 827 | DISABLE_INTS |
0ebc4cda | 828 | addi r3,r1,STACK_FRAME_OVERHEAD |
0ebc4cda BH |
829 | bl .vsx_unavailable_exception |
830 | b .ret_from_except | |
831 | ||
832 | .align 7 | |
833 | .globl __end_handlers | |
834 | __end_handlers: | |
835 | ||
0ebc4cda BH |
836 | /* |
837 | * Hash table stuff | |
838 | */ | |
839 | .align 7 | |
840 | _STATIC(do_hash_page) | |
841 | std r3,_DAR(r1) | |
842 | std r4,_DSISR(r1) | |
843 | ||
9c7cc234 | 844 | andis. r0,r4,0xa410 /* weird error? */ |
0ebc4cda | 845 | bne- handle_page_fault /* if not, try to insert a HPTE */ |
9c7cc234 P |
846 | andis. r0,r4,DSISR_DABRMATCH@h |
847 | bne- handle_dabr_fault | |
848 | ||
0ebc4cda BH |
849 | BEGIN_FTR_SECTION |
850 | andis. r0,r4,0x0020 /* Is it a segment table fault? */ | |
851 | bne- do_ste_alloc /* If so handle it */ | |
44ae3ab3 | 852 | END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB) |
0ebc4cda | 853 | |
9c1e1052 PM |
854 | clrrdi r11,r1,THREAD_SHIFT |
855 | lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */ | |
856 | andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */ | |
857 | bne 77f /* then don't call hash_page now */ | |
0ebc4cda BH |
858 | /* |
859 | * We need to set the _PAGE_USER bit if MSR_PR is set or if we are | |
860 | * accessing a userspace segment (even from the kernel). We assume | |
861 | * kernel addresses always have the high bit set. | |
862 | */ | |
863 | rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */ | |
864 | rotldi r0,r3,15 /* Move high bit into MSR_PR posn */ | |
865 | orc r0,r12,r0 /* MSR_PR | ~high_bit */ | |
866 | rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */ | |
867 | ori r4,r4,1 /* add _PAGE_PRESENT */ | |
868 | rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */ | |
869 | ||
870 | /* | |
871 | * r3 contains the faulting address | |
872 | * r4 contains the required access permissions | |
873 | * r5 contains the trap number | |
874 | * | |
7230c564 | 875 | * at return r3 = 0 for success, 1 for page fault, negative for error |
0ebc4cda BH |
876 | */ |
877 | bl .hash_page /* build HPTE if possible */ | |
878 | cmpdi r3,0 /* see if hash_page succeeded */ | |
879 | ||
7230c564 | 880 | /* Success */ |
0ebc4cda | 881 | beq fast_exc_return_irq /* Return from exception on success */ |
0ebc4cda | 882 | |
7230c564 BH |
883 | /* Error */ |
884 | blt- 13f | |
9c7cc234 | 885 | |
0ebc4cda BH |
886 | /* Here we have a page fault that hash_page can't handle. */ |
887 | handle_page_fault: | |
0ebc4cda BH |
888 | 11: ld r4,_DAR(r1) |
889 | ld r5,_DSISR(r1) | |
890 | addi r3,r1,STACK_FRAME_OVERHEAD | |
891 | bl .do_page_fault | |
892 | cmpdi r3,0 | |
a546498f | 893 | beq+ 12f |
0ebc4cda BH |
894 | bl .save_nvgprs |
895 | mr r5,r3 | |
896 | addi r3,r1,STACK_FRAME_OVERHEAD | |
897 | lwz r4,_DAR(r1) | |
898 | bl .bad_page_fault | |
899 | b .ret_from_except | |
900 | ||
a546498f BH |
901 | /* We have a data breakpoint exception - handle it */ |
902 | handle_dabr_fault: | |
903 | bl .save_nvgprs | |
904 | ld r4,_DAR(r1) | |
905 | ld r5,_DSISR(r1) | |
906 | addi r3,r1,STACK_FRAME_OVERHEAD | |
907 | bl .do_dabr | |
908 | 12: b .ret_from_except_lite | |
909 | ||
0ebc4cda BH |
910 | |
911 | /* We have a page fault that hash_page could handle but HV refused | |
912 | * the PTE insertion | |
913 | */ | |
a546498f | 914 | 13: bl .save_nvgprs |
0ebc4cda BH |
915 | mr r5,r3 |
916 | addi r3,r1,STACK_FRAME_OVERHEAD | |
917 | ld r4,_DAR(r1) | |
918 | bl .low_hash_fault | |
919 | b .ret_from_except | |
920 | ||
9c1e1052 PM |
921 | /* |
922 | * We come here as a result of a DSI at a point where we don't want | |
923 | * to call hash_page, such as when we are accessing memory (possibly | |
924 | * user memory) inside a PMU interrupt that occurred while interrupts | |
925 | * were soft-disabled. We want to invoke the exception handler for | |
926 | * the access, or panic if there isn't a handler. | |
927 | */ | |
928 | 77: bl .save_nvgprs | |
929 | mr r4,r3 | |
930 | addi r3,r1,STACK_FRAME_OVERHEAD | |
931 | li r5,SIGSEGV | |
932 | bl .bad_page_fault | |
933 | b .ret_from_except | |
934 | ||
0ebc4cda BH |
935 | /* here we have a segment miss */ |
936 | do_ste_alloc: | |
937 | bl .ste_allocate /* try to insert stab entry */ | |
938 | cmpdi r3,0 | |
939 | bne- handle_page_fault | |
940 | b fast_exception_return | |
941 | ||
942 | /* | |
943 | * r13 points to the PACA, r9 contains the saved CR, | |
944 | * r11 and r12 contain the saved SRR0 and SRR1. | |
945 | * r9 - r13 are saved in paca->exslb. | |
946 | * We assume we aren't going to take any exceptions during this procedure. | |
947 | * We assume (DAR >> 60) == 0xc. | |
948 | */ | |
949 | .align 7 | |
950 | _GLOBAL(do_stab_bolted) | |
951 | stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ | |
952 | std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */ | |
953 | ||
954 | /* Hash to the primary group */ | |
955 | ld r10,PACASTABVIRT(r13) | |
956 | mfspr r11,SPRN_DAR | |
957 | srdi r11,r11,28 | |
958 | rldimi r10,r11,7,52 /* r10 = first ste of the group */ | |
959 | ||
960 | /* Calculate VSID */ | |
961 | /* This is a kernel address, so protovsid = ESID */ | |
962 | ASM_VSID_SCRAMBLE(r11, r9, 256M) | |
963 | rldic r9,r11,12,16 /* r9 = vsid << 12 */ | |
964 | ||
965 | /* Search the primary group for a free entry */ | |
966 | 1: ld r11,0(r10) /* Test valid bit of the current ste */ | |
967 | andi. r11,r11,0x80 | |
968 | beq 2f | |
969 | addi r10,r10,16 | |
970 | andi. r11,r10,0x70 | |
971 | bne 1b | |
972 | ||
973 | /* Stick for only searching the primary group for now. */ | |
974 | /* At least for now, we use a very simple random castout scheme */ | |
975 | /* Use the TB as a random number ; OR in 1 to avoid entry 0 */ | |
976 | mftb r11 | |
977 | rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */ | |
978 | ori r11,r11,0x10 | |
979 | ||
980 | /* r10 currently points to an ste one past the group of interest */ | |
981 | /* make it point to the randomly selected entry */ | |
982 | subi r10,r10,128 | |
983 | or r10,r10,r11 /* r10 is the entry to invalidate */ | |
984 | ||
985 | isync /* mark the entry invalid */ | |
986 | ld r11,0(r10) | |
987 | rldicl r11,r11,56,1 /* clear the valid bit */ | |
988 | rotldi r11,r11,8 | |
989 | std r11,0(r10) | |
990 | sync | |
991 | ||
992 | clrrdi r11,r11,28 /* Get the esid part of the ste */ | |
993 | slbie r11 | |
994 | ||
995 | 2: std r9,8(r10) /* Store the vsid part of the ste */ | |
996 | eieio | |
997 | ||
998 | mfspr r11,SPRN_DAR /* Get the new esid */ | |
999 | clrrdi r11,r11,28 /* Permits a full 32b of ESID */ | |
1000 | ori r11,r11,0x90 /* Turn on valid and kp */ | |
1001 | std r11,0(r10) /* Put new entry back into the stab */ | |
1002 | ||
1003 | sync | |
1004 | ||
1005 | /* All done -- return from exception. */ | |
1006 | lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ | |
1007 | ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */ | |
1008 | ||
1009 | andi. r10,r12,MSR_RI | |
1010 | beq- unrecov_slb | |
1011 | ||
1012 | mtcrf 0x80,r9 /* restore CR */ | |
1013 | ||
1014 | mfmsr r10 | |
1015 | clrrdi r10,r10,2 | |
1016 | mtmsrd r10,1 | |
1017 | ||
1018 | mtspr SPRN_SRR0,r11 | |
1019 | mtspr SPRN_SRR1,r12 | |
1020 | ld r9,PACA_EXSLB+EX_R9(r13) | |
1021 | ld r10,PACA_EXSLB+EX_R10(r13) | |
1022 | ld r11,PACA_EXSLB+EX_R11(r13) | |
1023 | ld r12,PACA_EXSLB+EX_R12(r13) | |
1024 | ld r13,PACA_EXSLB+EX_R13(r13) | |
1025 | rfid | |
1026 | b . /* prevent speculative execution */ | |
1027 | ||
ed79ba9e | 1028 | #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) |
0ebc4cda BH |
1029 | /* |
1030 | * Data area reserved for FWNMI option. | |
1031 | * This address (0x7000) is fixed by the RPA. | |
1032 | */ | |
1033 | .= 0x7000 | |
1034 | .globl fwnmi_data_area | |
1035 | fwnmi_data_area: | |
0ebc4cda | 1036 | |
ed79ba9e BH |
1037 | /* pseries and powernv need to keep the whole page from |
1038 | * 0x7000 to 0x8000 free for use by the firmware | |
1039 | */ | |
0ebc4cda | 1040 | . = 0x8000 |
ed79ba9e | 1041 | #endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */ |
84493804 | 1042 | |
4f8cf36f BH |
1043 | /* Space for CPU0's segment table */ |
1044 | .balign 4096 | |
84493804 BH |
1045 | .globl initial_stab |
1046 | initial_stab: | |
1047 | .space 4096 | |
4f8cf36f | 1048 | |
ed79ba9e BH |
1049 | #ifdef CONFIG_PPC_POWERNV |
1050 | _GLOBAL(opal_mc_secondary_handler) | |
1051 | HMT_MEDIUM | |
1052 | SET_SCRATCH0(r13) | |
1053 | GET_PACA(r13) | |
1054 | clrldi r3,r3,2 | |
1055 | tovirt(r3,r3) | |
1056 | std r3,PACA_OPAL_MC_EVT(r13) | |
1057 | ld r13,OPAL_MC_SRR0(r3) | |
1058 | mtspr SPRN_SRR0,r13 | |
1059 | ld r13,OPAL_MC_SRR1(r3) | |
1060 | mtspr SPRN_SRR1,r13 | |
1061 | ld r3,OPAL_MC_GPR3(r3) | |
1062 | GET_SCRATCH0(r13) | |
1063 | b machine_check_pSeries | |
1064 | #endif /* CONFIG_PPC_POWERNV */ |