Commit | Line | Data |
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14cf11af | 1 | /* |
14cf11af PM |
2 | * PowerPC version |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * | |
5 | * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP | |
6 | * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> | |
7 | * Adapted for Power Macintosh by Paul Mackerras. | |
8 | * Low-level exception handlers and MMU support | |
9 | * rewritten by Paul Mackerras. | |
10 | * Copyright (C) 1996 Paul Mackerras. | |
11 | * | |
12 | * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and | |
13 | * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com | |
14 | * | |
15 | * This file contains the low-level support and setup for the | |
16 | * PowerPC-64 platform, including trap and interrupt dispatch. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
14cf11af | 24 | #include <linux/threads.h> |
b5bbeb23 | 25 | #include <asm/reg.h> |
14cf11af PM |
26 | #include <asm/page.h> |
27 | #include <asm/mmu.h> | |
14cf11af PM |
28 | #include <asm/ppc_asm.h> |
29 | #include <asm/asm-offsets.h> | |
30 | #include <asm/bug.h> | |
31 | #include <asm/cputable.h> | |
32 | #include <asm/setup.h> | |
33 | #include <asm/hvcall.h> | |
c43a55ff | 34 | #include <asm/iseries/lpar_map.h> |
6cb7bfeb | 35 | #include <asm/thread_info.h> |
3f639ee8 | 36 | #include <asm/firmware.h> |
14cf11af | 37 | |
14cf11af | 38 | #define DO_SOFT_DISABLE |
14cf11af PM |
39 | |
40 | /* | |
41 | * We layout physical memory as follows: | |
42 | * 0x0000 - 0x00ff : Secondary processor spin code | |
43 | * 0x0100 - 0x2fff : pSeries Interrupt prologs | |
44 | * 0x3000 - 0x5fff : interrupt support, iSeries and common interrupt prologs | |
45 | * 0x6000 - 0x6fff : Initial (CPU0) segment table | |
46 | * 0x7000 - 0x7fff : FWNMI data area | |
47 | * 0x8000 - : Early init and support code | |
48 | */ | |
49 | ||
50 | /* | |
51 | * SPRG Usage | |
52 | * | |
53 | * Register Definition | |
54 | * | |
55 | * SPRG0 reserved for hypervisor | |
56 | * SPRG1 temp - used to save gpr | |
57 | * SPRG2 temp - used to save gpr | |
58 | * SPRG3 virt addr of paca | |
59 | */ | |
60 | ||
61 | /* | |
62 | * Entering into this code we make the following assumptions: | |
63 | * For pSeries: | |
64 | * 1. The MMU is off & open firmware is running in real mode. | |
65 | * 2. The kernel is entered at __start | |
66 | * | |
67 | * For iSeries: | |
68 | * 1. The MMU is on (as it always is for iSeries) | |
69 | * 2. The kernel is entered at system_reset_iSeries | |
70 | */ | |
71 | ||
72 | .text | |
73 | .globl _stext | |
74 | _stext: | |
14cf11af PM |
75 | _GLOBAL(__start) |
76 | /* NOP this out unconditionally */ | |
77 | BEGIN_FTR_SECTION | |
b85a046a | 78 | b .__start_initialization_multiplatform |
14cf11af | 79 | END_FTR_SECTION(0, 1) |
14cf11af PM |
80 | |
81 | /* Catch branch to 0 in real mode */ | |
82 | trap | |
83 | ||
14cf11af PM |
84 | /* Secondary processors spin on this value until it goes to 1. */ |
85 | .globl __secondary_hold_spinloop | |
86 | __secondary_hold_spinloop: | |
87 | .llong 0x0 | |
88 | ||
89 | /* Secondary processors write this value with their cpu # */ | |
90 | /* after they enter the spin loop immediately below. */ | |
91 | .globl __secondary_hold_acknowledge | |
92 | __secondary_hold_acknowledge: | |
93 | .llong 0x0 | |
94 | ||
1dce0e30 ME |
95 | #ifdef CONFIG_PPC_ISERIES |
96 | /* | |
97 | * At offset 0x20, there is a pointer to iSeries LPAR data. | |
98 | * This is required by the hypervisor | |
99 | */ | |
100 | . = 0x20 | |
101 | .llong hvReleaseData-KERNELBASE | |
102 | #endif /* CONFIG_PPC_ISERIES */ | |
103 | ||
14cf11af PM |
104 | . = 0x60 |
105 | /* | |
106 | * The following code is used on pSeries to hold secondary processors | |
107 | * in a spin loop after they have been freed from OpenFirmware, but | |
108 | * before the bulk of the kernel has been relocated. This code | |
109 | * is relocated to physical address 0x60 before prom_init is run. | |
110 | * All of it must fit below the first exception vector at 0x100. | |
111 | */ | |
112 | _GLOBAL(__secondary_hold) | |
113 | mfmsr r24 | |
114 | ori r24,r24,MSR_RI | |
115 | mtmsrd r24 /* RI on */ | |
116 | ||
f1870f77 | 117 | /* Grab our physical cpu number */ |
14cf11af PM |
118 | mr r24,r3 |
119 | ||
120 | /* Tell the master cpu we're here */ | |
121 | /* Relocation is off & we are located at an address less */ | |
122 | /* than 0x100, so only need to grab low order offset. */ | |
123 | std r24,__secondary_hold_acknowledge@l(0) | |
124 | sync | |
125 | ||
126 | /* All secondary cpus wait here until told to start. */ | |
127 | 100: ld r4,__secondary_hold_spinloop@l(0) | |
128 | cmpdi 0,r4,1 | |
129 | bne 100b | |
130 | ||
f1870f77 | 131 | #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) |
f39b7a55 | 132 | LOAD_REG_IMMEDIATE(r4, .generic_secondary_smp_init) |
758438a7 | 133 | mtctr r4 |
14cf11af | 134 | mr r3,r24 |
758438a7 | 135 | bctr |
14cf11af PM |
136 | #else |
137 | BUG_OPCODE | |
138 | #endif | |
14cf11af PM |
139 | |
140 | /* This value is used to mark exception frames on the stack. */ | |
141 | .section ".toc","aw" | |
142 | exception_marker: | |
143 | .tc ID_72656773_68657265[TC],0x7265677368657265 | |
144 | .text | |
145 | ||
146 | /* | |
147 | * The following macros define the code that appears as | |
148 | * the prologue to each of the exception handlers. They | |
149 | * are split into two parts to allow a single kernel binary | |
150 | * to be used for pSeries and iSeries. | |
151 | * LOL. One day... - paulus | |
152 | */ | |
153 | ||
154 | /* | |
155 | * We make as much of the exception code common between native | |
156 | * exception handlers (including pSeries LPAR) and iSeries LPAR | |
157 | * implementations as possible. | |
158 | */ | |
159 | ||
160 | /* | |
161 | * This is the start of the interrupt handlers for pSeries | |
162 | * This code runs with relocation off. | |
163 | */ | |
164 | #define EX_R9 0 | |
165 | #define EX_R10 8 | |
166 | #define EX_R11 16 | |
167 | #define EX_R12 24 | |
168 | #define EX_R13 32 | |
169 | #define EX_SRR0 40 | |
14cf11af | 170 | #define EX_DAR 48 |
14cf11af PM |
171 | #define EX_DSISR 56 |
172 | #define EX_CCR 60 | |
3c726f8d BH |
173 | #define EX_R3 64 |
174 | #define EX_LR 72 | |
14cf11af | 175 | |
758438a7 | 176 | /* |
e58c3495 DG |
177 | * We're short on space and time in the exception prolog, so we can't |
178 | * use the normal SET_REG_IMMEDIATE macro. Normally we just need the | |
179 | * low halfword of the address, but for Kdump we need the whole low | |
180 | * word. | |
758438a7 ME |
181 | */ |
182 | #ifdef CONFIG_CRASH_DUMP | |
183 | #define LOAD_HANDLER(reg, label) \ | |
184 | oris reg,reg,(label)@h; /* virt addr of handler ... */ \ | |
185 | ori reg,reg,(label)@l; /* .. and the rest */ | |
186 | #else | |
187 | #define LOAD_HANDLER(reg, label) \ | |
188 | ori reg,reg,(label)@l; /* virt addr of handler ... */ | |
189 | #endif | |
190 | ||
9fc0a92c OH |
191 | /* |
192 | * Equal to EXCEPTION_PROLOG_PSERIES, except that it forces 64bit mode. | |
193 | * The firmware calls the registered system_reset_fwnmi and | |
194 | * machine_check_fwnmi handlers in 32bit mode if the cpu happens to run | |
195 | * a 32bit application at the time of the event. | |
196 | * This firmware bug is present on POWER4 and JS20. | |
197 | */ | |
198 | #define EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(area, label) \ | |
199 | mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \ | |
200 | std r9,area+EX_R9(r13); /* save r9 - r12 */ \ | |
201 | std r10,area+EX_R10(r13); \ | |
202 | std r11,area+EX_R11(r13); \ | |
203 | std r12,area+EX_R12(r13); \ | |
204 | mfspr r9,SPRN_SPRG1; \ | |
205 | std r9,area+EX_R13(r13); \ | |
206 | mfcr r9; \ | |
207 | clrrdi r12,r13,32; /* get high part of &label */ \ | |
208 | mfmsr r10; \ | |
209 | /* force 64bit mode */ \ | |
210 | li r11,5; /* MSR_SF_LG|MSR_ISF_LG */ \ | |
211 | rldimi r10,r11,61,0; /* insert into top 3 bits */ \ | |
212 | /* done 64bit mode */ \ | |
213 | mfspr r11,SPRN_SRR0; /* save SRR0 */ \ | |
214 | LOAD_HANDLER(r12,label) \ | |
215 | ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \ | |
216 | mtspr SPRN_SRR0,r12; \ | |
217 | mfspr r12,SPRN_SRR1; /* and SRR1 */ \ | |
218 | mtspr SPRN_SRR1,r10; \ | |
219 | rfid; \ | |
220 | b . /* prevent speculative execution */ | |
221 | ||
14cf11af | 222 | #define EXCEPTION_PROLOG_PSERIES(area, label) \ |
b5bbeb23 | 223 | mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \ |
14cf11af PM |
224 | std r9,area+EX_R9(r13); /* save r9 - r12 */ \ |
225 | std r10,area+EX_R10(r13); \ | |
226 | std r11,area+EX_R11(r13); \ | |
227 | std r12,area+EX_R12(r13); \ | |
b5bbeb23 | 228 | mfspr r9,SPRN_SPRG1; \ |
14cf11af PM |
229 | std r9,area+EX_R13(r13); \ |
230 | mfcr r9; \ | |
231 | clrrdi r12,r13,32; /* get high part of &label */ \ | |
232 | mfmsr r10; \ | |
b5bbeb23 | 233 | mfspr r11,SPRN_SRR0; /* save SRR0 */ \ |
758438a7 | 234 | LOAD_HANDLER(r12,label) \ |
14cf11af | 235 | ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \ |
b5bbeb23 PM |
236 | mtspr SPRN_SRR0,r12; \ |
237 | mfspr r12,SPRN_SRR1; /* and SRR1 */ \ | |
238 | mtspr SPRN_SRR1,r10; \ | |
14cf11af PM |
239 | rfid; \ |
240 | b . /* prevent speculative execution */ | |
241 | ||
242 | /* | |
243 | * This is the start of the interrupt handlers for iSeries | |
244 | * This code runs with relocation on. | |
245 | */ | |
246 | #define EXCEPTION_PROLOG_ISERIES_1(area) \ | |
b5bbeb23 | 247 | mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \ |
14cf11af PM |
248 | std r9,area+EX_R9(r13); /* save r9 - r12 */ \ |
249 | std r10,area+EX_R10(r13); \ | |
250 | std r11,area+EX_R11(r13); \ | |
251 | std r12,area+EX_R12(r13); \ | |
b5bbeb23 | 252 | mfspr r9,SPRN_SPRG1; \ |
14cf11af PM |
253 | std r9,area+EX_R13(r13); \ |
254 | mfcr r9 | |
255 | ||
256 | #define EXCEPTION_PROLOG_ISERIES_2 \ | |
257 | mfmsr r10; \ | |
3356bb9f DG |
258 | ld r12,PACALPPACAPTR(r13); \ |
259 | ld r11,LPPACASRR0(r12); \ | |
260 | ld r12,LPPACASRR1(r12); \ | |
14cf11af PM |
261 | ori r10,r10,MSR_RI; \ |
262 | mtmsrd r10,1 | |
263 | ||
264 | /* | |
265 | * The common exception prolog is used for all except a few exceptions | |
266 | * such as a segment miss on a kernel address. We have to be prepared | |
267 | * to take another exception from the point where we first touch the | |
268 | * kernel stack onwards. | |
269 | * | |
270 | * On entry r13 points to the paca, r9-r13 are saved in the paca, | |
271 | * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and | |
272 | * SRR1, and relocation is on. | |
273 | */ | |
274 | #define EXCEPTION_PROLOG_COMMON(n, area) \ | |
275 | andi. r10,r12,MSR_PR; /* See if coming from user */ \ | |
276 | mr r10,r1; /* Save r1 */ \ | |
277 | subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \ | |
278 | beq- 1f; \ | |
279 | ld r1,PACAKSAVE(r13); /* kernel stack to use */ \ | |
280 | 1: cmpdi cr1,r1,0; /* check if r1 is in userspace */ \ | |
68730401 OJ |
281 | bge- cr1,2f; /* abort if it is */ \ |
282 | b 3f; \ | |
283 | 2: li r1,(n); /* will be reloaded later */ \ | |
284 | sth r1,PACA_TRAP_SAVE(r13); \ | |
285 | b bad_stack; \ | |
286 | 3: std r9,_CCR(r1); /* save CR in stackframe */ \ | |
14cf11af PM |
287 | std r11,_NIP(r1); /* save SRR0 in stackframe */ \ |
288 | std r12,_MSR(r1); /* save SRR1 in stackframe */ \ | |
289 | std r10,0(r1); /* make stack chain pointer */ \ | |
290 | std r0,GPR0(r1); /* save r0 in stackframe */ \ | |
291 | std r10,GPR1(r1); /* save r1 in stackframe */ \ | |
c6622f63 | 292 | ACCOUNT_CPU_USER_ENTRY(r9, r10); \ |
14cf11af PM |
293 | std r2,GPR2(r1); /* save r2 in stackframe */ \ |
294 | SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \ | |
295 | SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \ | |
296 | ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \ | |
297 | ld r10,area+EX_R10(r13); \ | |
298 | std r9,GPR9(r1); \ | |
299 | std r10,GPR10(r1); \ | |
300 | ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \ | |
301 | ld r10,area+EX_R12(r13); \ | |
302 | ld r11,area+EX_R13(r13); \ | |
303 | std r9,GPR11(r1); \ | |
304 | std r10,GPR12(r1); \ | |
305 | std r11,GPR13(r1); \ | |
306 | ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \ | |
307 | mflr r9; /* save LR in stackframe */ \ | |
308 | std r9,_LINK(r1); \ | |
309 | mfctr r10; /* save CTR in stackframe */ \ | |
310 | std r10,_CTR(r1); \ | |
d04c56f7 | 311 | lbz r10,PACASOFTIRQEN(r13); \ |
b5bbeb23 | 312 | mfspr r11,SPRN_XER; /* save XER in stackframe */ \ |
d04c56f7 | 313 | std r10,SOFTE(r1); \ |
14cf11af PM |
314 | std r11,_XER(r1); \ |
315 | li r9,(n)+1; \ | |
316 | std r9,_TRAP(r1); /* set trap number */ \ | |
317 | li r10,0; \ | |
318 | ld r11,exception_marker@toc(r2); \ | |
319 | std r10,RESULT(r1); /* clear regs->result */ \ | |
320 | std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ | |
321 | ||
322 | /* | |
323 | * Exception vectors. | |
324 | */ | |
325 | #define STD_EXCEPTION_PSERIES(n, label) \ | |
326 | . = n; \ | |
327 | .globl label##_pSeries; \ | |
328 | label##_pSeries: \ | |
329 | HMT_MEDIUM; \ | |
b5bbeb23 | 330 | mtspr SPRN_SPRG1,r13; /* save r13 */ \ |
14cf11af PM |
331 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common) |
332 | ||
acf7d768 BH |
333 | #define HSTD_EXCEPTION_PSERIES(n, label) \ |
334 | . = n; \ | |
335 | .globl label##_pSeries; \ | |
336 | label##_pSeries: \ | |
337 | HMT_MEDIUM; \ | |
338 | mtspr SPRN_SPRG1,r20; /* save r20 */ \ | |
339 | mfspr r20,SPRN_HSRR0; /* copy HSRR0 to SRR0 */ \ | |
340 | mtspr SPRN_SRR0,r20; \ | |
341 | mfspr r20,SPRN_HSRR1; /* copy HSRR0 to SRR0 */ \ | |
342 | mtspr SPRN_SRR1,r20; \ | |
343 | mfspr r20,SPRN_SPRG1; /* restore r20 */ \ | |
344 | mtspr SPRN_SPRG1,r13; /* save r13 */ \ | |
345 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common) | |
346 | ||
347 | ||
d04c56f7 PM |
348 | #define MASKABLE_EXCEPTION_PSERIES(n, label) \ |
349 | . = n; \ | |
350 | .globl label##_pSeries; \ | |
351 | label##_pSeries: \ | |
352 | HMT_MEDIUM; \ | |
353 | mtspr SPRN_SPRG1,r13; /* save r13 */ \ | |
354 | mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \ | |
355 | std r9,PACA_EXGEN+EX_R9(r13); /* save r9, r10 */ \ | |
356 | std r10,PACA_EXGEN+EX_R10(r13); \ | |
357 | lbz r10,PACASOFTIRQEN(r13); \ | |
358 | mfcr r9; \ | |
359 | cmpwi r10,0; \ | |
360 | beq masked_interrupt; \ | |
361 | mfspr r10,SPRN_SPRG1; \ | |
362 | std r10,PACA_EXGEN+EX_R13(r13); \ | |
363 | std r11,PACA_EXGEN+EX_R11(r13); \ | |
364 | std r12,PACA_EXGEN+EX_R12(r13); \ | |
365 | clrrdi r12,r13,32; /* get high part of &label */ \ | |
366 | mfmsr r10; \ | |
367 | mfspr r11,SPRN_SRR0; /* save SRR0 */ \ | |
368 | LOAD_HANDLER(r12,label##_common) \ | |
369 | ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \ | |
370 | mtspr SPRN_SRR0,r12; \ | |
371 | mfspr r12,SPRN_SRR1; /* and SRR1 */ \ | |
372 | mtspr SPRN_SRR1,r10; \ | |
373 | rfid; \ | |
374 | b . /* prevent speculative execution */ | |
375 | ||
14cf11af PM |
376 | #define STD_EXCEPTION_ISERIES(n, label, area) \ |
377 | .globl label##_iSeries; \ | |
378 | label##_iSeries: \ | |
379 | HMT_MEDIUM; \ | |
b5bbeb23 | 380 | mtspr SPRN_SPRG1,r13; /* save r13 */ \ |
14cf11af PM |
381 | EXCEPTION_PROLOG_ISERIES_1(area); \ |
382 | EXCEPTION_PROLOG_ISERIES_2; \ | |
383 | b label##_common | |
384 | ||
385 | #define MASKABLE_EXCEPTION_ISERIES(n, label) \ | |
386 | .globl label##_iSeries; \ | |
387 | label##_iSeries: \ | |
388 | HMT_MEDIUM; \ | |
b5bbeb23 | 389 | mtspr SPRN_SPRG1,r13; /* save r13 */ \ |
14cf11af | 390 | EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \ |
d04c56f7 | 391 | lbz r10,PACASOFTIRQEN(r13); \ |
14cf11af PM |
392 | cmpwi 0,r10,0; \ |
393 | beq- label##_iSeries_masked; \ | |
394 | EXCEPTION_PROLOG_ISERIES_2; \ | |
395 | b label##_common; \ | |
396 | ||
d04c56f7 | 397 | #ifdef CONFIG_PPC_ISERIES |
14cf11af | 398 | #define DISABLE_INTS \ |
14cf11af | 399 | li r11,0; \ |
d04c56f7 PM |
400 | stb r11,PACASOFTIRQEN(r13); \ |
401 | BEGIN_FW_FTR_SECTION; \ | |
402 | stb r11,PACAHARDIRQEN(r13); \ | |
403 | END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \ | |
404 | BEGIN_FW_FTR_SECTION; \ | |
14cf11af | 405 | mfmsr r10; \ |
14cf11af | 406 | ori r10,r10,MSR_EE; \ |
3f639ee8 SR |
407 | mtmsrd r10,1; \ |
408 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) | |
14cf11af | 409 | |
d04c56f7 PM |
410 | #else |
411 | #define DISABLE_INTS \ | |
412 | li r11,0; \ | |
413 | stb r11,PACASOFTIRQEN(r13); \ | |
414 | stb r11,PACAHARDIRQEN(r13) | |
14cf11af | 415 | |
d04c56f7 | 416 | #endif /* CONFIG_PPC_ISERIES */ |
14cf11af PM |
417 | |
418 | #define ENABLE_INTS \ | |
419 | ld r12,_MSR(r1); \ | |
420 | mfmsr r11; \ | |
421 | rlwimi r11,r12,0,MSR_EE; \ | |
422 | mtmsrd r11,1 | |
423 | ||
14cf11af PM |
424 | #define STD_EXCEPTION_COMMON(trap, label, hdlr) \ |
425 | .align 7; \ | |
426 | .globl label##_common; \ | |
427 | label##_common: \ | |
428 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ | |
429 | DISABLE_INTS; \ | |
430 | bl .save_nvgprs; \ | |
431 | addi r3,r1,STACK_FRAME_OVERHEAD; \ | |
432 | bl hdlr; \ | |
433 | b .ret_from_except | |
434 | ||
f39224a8 PM |
435 | /* |
436 | * Like STD_EXCEPTION_COMMON, but for exceptions that can occur | |
437 | * in the idle task and therefore need the special idle handling. | |
438 | */ | |
439 | #define STD_EXCEPTION_COMMON_IDLE(trap, label, hdlr) \ | |
440 | .align 7; \ | |
441 | .globl label##_common; \ | |
442 | label##_common: \ | |
443 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ | |
444 | FINISH_NAP; \ | |
445 | DISABLE_INTS; \ | |
446 | bl .save_nvgprs; \ | |
447 | addi r3,r1,STACK_FRAME_OVERHEAD; \ | |
448 | bl hdlr; \ | |
449 | b .ret_from_except | |
450 | ||
14cf11af PM |
451 | #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr) \ |
452 | .align 7; \ | |
453 | .globl label##_common; \ | |
454 | label##_common: \ | |
455 | EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ | |
f39224a8 | 456 | FINISH_NAP; \ |
14cf11af | 457 | DISABLE_INTS; \ |
cb2c9b27 | 458 | bl .ppc64_runlatch_on; \ |
14cf11af PM |
459 | addi r3,r1,STACK_FRAME_OVERHEAD; \ |
460 | bl hdlr; \ | |
461 | b .ret_from_except_lite | |
462 | ||
f39224a8 PM |
463 | /* |
464 | * When the idle code in power4_idle puts the CPU into NAP mode, | |
465 | * it has to do so in a loop, and relies on the external interrupt | |
466 | * and decrementer interrupt entry code to get it out of the loop. | |
467 | * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags | |
468 | * to signal that it is in the loop and needs help to get out. | |
469 | */ | |
470 | #ifdef CONFIG_PPC_970_NAP | |
471 | #define FINISH_NAP \ | |
472 | BEGIN_FTR_SECTION \ | |
473 | clrrdi r11,r1,THREAD_SHIFT; \ | |
474 | ld r9,TI_LOCAL_FLAGS(r11); \ | |
475 | andi. r10,r9,_TLF_NAPPING; \ | |
476 | bnel power4_fixup_nap; \ | |
477 | END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) | |
478 | #else | |
479 | #define FINISH_NAP | |
480 | #endif | |
481 | ||
14cf11af PM |
482 | /* |
483 | * Start of pSeries system interrupt routines | |
484 | */ | |
485 | . = 0x100 | |
486 | .globl __start_interrupts | |
487 | __start_interrupts: | |
488 | ||
489 | STD_EXCEPTION_PSERIES(0x100, system_reset) | |
490 | ||
491 | . = 0x200 | |
492 | _machine_check_pSeries: | |
493 | HMT_MEDIUM | |
b5bbeb23 | 494 | mtspr SPRN_SPRG1,r13 /* save r13 */ |
14cf11af PM |
495 | EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common) |
496 | ||
497 | . = 0x300 | |
498 | .globl data_access_pSeries | |
499 | data_access_pSeries: | |
500 | HMT_MEDIUM | |
b5bbeb23 | 501 | mtspr SPRN_SPRG1,r13 |
14cf11af | 502 | BEGIN_FTR_SECTION |
b5bbeb23 PM |
503 | mtspr SPRN_SPRG2,r12 |
504 | mfspr r13,SPRN_DAR | |
505 | mfspr r12,SPRN_DSISR | |
14cf11af PM |
506 | srdi r13,r13,60 |
507 | rlwimi r13,r12,16,0x20 | |
508 | mfcr r12 | |
509 | cmpwi r13,0x2c | |
3ccfc65c | 510 | beq do_stab_bolted_pSeries |
14cf11af | 511 | mtcrf 0x80,r12 |
b5bbeb23 | 512 | mfspr r12,SPRN_SPRG2 |
14cf11af PM |
513 | END_FTR_SECTION_IFCLR(CPU_FTR_SLB) |
514 | EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common) | |
515 | ||
516 | . = 0x380 | |
517 | .globl data_access_slb_pSeries | |
518 | data_access_slb_pSeries: | |
519 | HMT_MEDIUM | |
b5bbeb23 | 520 | mtspr SPRN_SPRG1,r13 |
b5bbeb23 | 521 | mfspr r13,SPRN_SPRG3 /* get paca address into r13 */ |
3c726f8d BH |
522 | std r3,PACA_EXSLB+EX_R3(r13) |
523 | mfspr r3,SPRN_DAR | |
14cf11af | 524 | std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */ |
3c726f8d BH |
525 | mfcr r9 |
526 | #ifdef __DISABLED__ | |
527 | /* Keep that around for when we re-implement dynamic VSIDs */ | |
528 | cmpdi r3,0 | |
529 | bge slb_miss_user_pseries | |
530 | #endif /* __DISABLED__ */ | |
14cf11af PM |
531 | std r10,PACA_EXSLB+EX_R10(r13) |
532 | std r11,PACA_EXSLB+EX_R11(r13) | |
533 | std r12,PACA_EXSLB+EX_R12(r13) | |
3c726f8d BH |
534 | mfspr r10,SPRN_SPRG1 |
535 | std r10,PACA_EXSLB+EX_R13(r13) | |
b5bbeb23 | 536 | mfspr r12,SPRN_SRR1 /* and SRR1 */ |
3c726f8d | 537 | b .slb_miss_realmode /* Rel. branch works in real mode */ |
14cf11af PM |
538 | |
539 | STD_EXCEPTION_PSERIES(0x400, instruction_access) | |
540 | ||
541 | . = 0x480 | |
542 | .globl instruction_access_slb_pSeries | |
543 | instruction_access_slb_pSeries: | |
544 | HMT_MEDIUM | |
b5bbeb23 | 545 | mtspr SPRN_SPRG1,r13 |
b5bbeb23 | 546 | mfspr r13,SPRN_SPRG3 /* get paca address into r13 */ |
3c726f8d BH |
547 | std r3,PACA_EXSLB+EX_R3(r13) |
548 | mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ | |
14cf11af | 549 | std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */ |
3c726f8d BH |
550 | mfcr r9 |
551 | #ifdef __DISABLED__ | |
552 | /* Keep that around for when we re-implement dynamic VSIDs */ | |
553 | cmpdi r3,0 | |
554 | bge slb_miss_user_pseries | |
555 | #endif /* __DISABLED__ */ | |
14cf11af PM |
556 | std r10,PACA_EXSLB+EX_R10(r13) |
557 | std r11,PACA_EXSLB+EX_R11(r13) | |
558 | std r12,PACA_EXSLB+EX_R12(r13) | |
3c726f8d BH |
559 | mfspr r10,SPRN_SPRG1 |
560 | std r10,PACA_EXSLB+EX_R13(r13) | |
b5bbeb23 | 561 | mfspr r12,SPRN_SRR1 /* and SRR1 */ |
3c726f8d | 562 | b .slb_miss_realmode /* Rel. branch works in real mode */ |
14cf11af | 563 | |
d04c56f7 | 564 | MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt) |
14cf11af PM |
565 | STD_EXCEPTION_PSERIES(0x600, alignment) |
566 | STD_EXCEPTION_PSERIES(0x700, program_check) | |
567 | STD_EXCEPTION_PSERIES(0x800, fp_unavailable) | |
d04c56f7 | 568 | MASKABLE_EXCEPTION_PSERIES(0x900, decrementer) |
14cf11af PM |
569 | STD_EXCEPTION_PSERIES(0xa00, trap_0a) |
570 | STD_EXCEPTION_PSERIES(0xb00, trap_0b) | |
571 | ||
572 | . = 0xc00 | |
573 | .globl system_call_pSeries | |
574 | system_call_pSeries: | |
575 | HMT_MEDIUM | |
14cf11af PM |
576 | mr r9,r13 |
577 | mfmsr r10 | |
b5bbeb23 PM |
578 | mfspr r13,SPRN_SPRG3 |
579 | mfspr r11,SPRN_SRR0 | |
14cf11af PM |
580 | clrrdi r12,r13,32 |
581 | oris r12,r12,system_call_common@h | |
582 | ori r12,r12,system_call_common@l | |
b5bbeb23 | 583 | mtspr SPRN_SRR0,r12 |
14cf11af | 584 | ori r10,r10,MSR_IR|MSR_DR|MSR_RI |
b5bbeb23 PM |
585 | mfspr r12,SPRN_SRR1 |
586 | mtspr SPRN_SRR1,r10 | |
14cf11af PM |
587 | rfid |
588 | b . /* prevent speculative execution */ | |
589 | ||
590 | STD_EXCEPTION_PSERIES(0xd00, single_step) | |
591 | STD_EXCEPTION_PSERIES(0xe00, trap_0e) | |
592 | ||
593 | /* We need to deal with the Altivec unavailable exception | |
594 | * here which is at 0xf20, thus in the middle of the | |
595 | * prolog code of the PerformanceMonitor one. A little | |
596 | * trickery is thus necessary | |
597 | */ | |
598 | . = 0xf00 | |
599 | b performance_monitor_pSeries | |
600 | ||
601 | STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable) | |
602 | ||
acf7d768 BH |
603 | #ifdef CONFIG_CBE_RAS |
604 | HSTD_EXCEPTION_PSERIES(0x1200, cbe_system_error) | |
605 | #endif /* CONFIG_CBE_RAS */ | |
14cf11af | 606 | STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint) |
acf7d768 BH |
607 | #ifdef CONFIG_CBE_RAS |
608 | HSTD_EXCEPTION_PSERIES(0x1600, cbe_maintenance) | |
609 | #endif /* CONFIG_CBE_RAS */ | |
14cf11af | 610 | STD_EXCEPTION_PSERIES(0x1700, altivec_assist) |
acf7d768 BH |
611 | #ifdef CONFIG_CBE_RAS |
612 | HSTD_EXCEPTION_PSERIES(0x1800, cbe_thermal) | |
613 | #endif /* CONFIG_CBE_RAS */ | |
14cf11af PM |
614 | |
615 | . = 0x3000 | |
616 | ||
617 | /*** pSeries interrupt support ***/ | |
618 | ||
619 | /* moved from 0xf00 */ | |
449d846d | 620 | STD_EXCEPTION_PSERIES(., performance_monitor) |
d04c56f7 PM |
621 | |
622 | /* | |
623 | * An interrupt came in while soft-disabled; clear EE in SRR1, | |
624 | * clear paca->hard_enabled and return. | |
625 | */ | |
626 | masked_interrupt: | |
627 | stb r10,PACAHARDIRQEN(r13) | |
628 | mtcrf 0x80,r9 | |
629 | ld r9,PACA_EXGEN+EX_R9(r13) | |
630 | mfspr r10,SPRN_SRR1 | |
631 | rldicl r10,r10,48,1 /* clear MSR_EE */ | |
632 | rotldi r10,r10,16 | |
633 | mtspr SPRN_SRR1,r10 | |
634 | ld r10,PACA_EXGEN+EX_R10(r13) | |
635 | mfspr r13,SPRN_SPRG1 | |
636 | rfid | |
637 | b . | |
14cf11af PM |
638 | |
639 | .align 7 | |
3ccfc65c | 640 | do_stab_bolted_pSeries: |
14cf11af | 641 | mtcrf 0x80,r12 |
b5bbeb23 | 642 | mfspr r12,SPRN_SPRG2 |
14cf11af PM |
643 | EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted) |
644 | ||
3c726f8d BH |
645 | /* |
646 | * We have some room here we use that to put | |
647 | * the peries slb miss user trampoline code so it's reasonably | |
648 | * away from slb_miss_user_common to avoid problems with rfid | |
649 | * | |
650 | * This is used for when the SLB miss handler has to go virtual, | |
651 | * which doesn't happen for now anymore but will once we re-implement | |
652 | * dynamic VSIDs for shared page tables | |
653 | */ | |
654 | #ifdef __DISABLED__ | |
655 | slb_miss_user_pseries: | |
656 | std r10,PACA_EXGEN+EX_R10(r13) | |
657 | std r11,PACA_EXGEN+EX_R11(r13) | |
658 | std r12,PACA_EXGEN+EX_R12(r13) | |
659 | mfspr r10,SPRG1 | |
660 | ld r11,PACA_EXSLB+EX_R9(r13) | |
661 | ld r12,PACA_EXSLB+EX_R3(r13) | |
662 | std r10,PACA_EXGEN+EX_R13(r13) | |
663 | std r11,PACA_EXGEN+EX_R9(r13) | |
664 | std r12,PACA_EXGEN+EX_R3(r13) | |
665 | clrrdi r12,r13,32 | |
666 | mfmsr r10 | |
667 | mfspr r11,SRR0 /* save SRR0 */ | |
668 | ori r12,r12,slb_miss_user_common@l /* virt addr of handler */ | |
669 | ori r10,r10,MSR_IR|MSR_DR|MSR_RI | |
670 | mtspr SRR0,r12 | |
671 | mfspr r12,SRR1 /* and SRR1 */ | |
672 | mtspr SRR1,r10 | |
673 | rfid | |
674 | b . /* prevent spec. execution */ | |
675 | #endif /* __DISABLED__ */ | |
676 | ||
14cf11af PM |
677 | /* |
678 | * Vectors for the FWNMI option. Share common code. | |
679 | */ | |
b5bbeb23 | 680 | .globl system_reset_fwnmi |
8c4f1f29 | 681 | .align 7 |
14cf11af | 682 | system_reset_fwnmi: |
b5bbeb23 PM |
683 | HMT_MEDIUM |
684 | mtspr SPRN_SPRG1,r13 /* save r13 */ | |
9fc0a92c | 685 | EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(PACA_EXGEN, system_reset_common) |
14cf11af | 686 | |
b5bbeb23 | 687 | .globl machine_check_fwnmi |
8c4f1f29 | 688 | .align 7 |
14cf11af | 689 | machine_check_fwnmi: |
b5bbeb23 PM |
690 | HMT_MEDIUM |
691 | mtspr SPRN_SPRG1,r13 /* save r13 */ | |
9fc0a92c | 692 | EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(PACA_EXMC, machine_check_common) |
14cf11af PM |
693 | |
694 | #ifdef CONFIG_PPC_ISERIES | |
695 | /*** ISeries-LPAR interrupt handlers ***/ | |
696 | ||
697 | STD_EXCEPTION_ISERIES(0x200, machine_check, PACA_EXMC) | |
698 | ||
699 | .globl data_access_iSeries | |
700 | data_access_iSeries: | |
b5bbeb23 | 701 | mtspr SPRN_SPRG1,r13 |
14cf11af | 702 | BEGIN_FTR_SECTION |
b5bbeb23 PM |
703 | mtspr SPRN_SPRG2,r12 |
704 | mfspr r13,SPRN_DAR | |
705 | mfspr r12,SPRN_DSISR | |
14cf11af PM |
706 | srdi r13,r13,60 |
707 | rlwimi r13,r12,16,0x20 | |
708 | mfcr r12 | |
709 | cmpwi r13,0x2c | |
710 | beq .do_stab_bolted_iSeries | |
711 | mtcrf 0x80,r12 | |
b5bbeb23 | 712 | mfspr r12,SPRN_SPRG2 |
14cf11af PM |
713 | END_FTR_SECTION_IFCLR(CPU_FTR_SLB) |
714 | EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN) | |
715 | EXCEPTION_PROLOG_ISERIES_2 | |
716 | b data_access_common | |
717 | ||
718 | .do_stab_bolted_iSeries: | |
719 | mtcrf 0x80,r12 | |
b5bbeb23 | 720 | mfspr r12,SPRN_SPRG2 |
14cf11af PM |
721 | EXCEPTION_PROLOG_ISERIES_1(PACA_EXSLB) |
722 | EXCEPTION_PROLOG_ISERIES_2 | |
723 | b .do_stab_bolted | |
724 | ||
725 | .globl data_access_slb_iSeries | |
726 | data_access_slb_iSeries: | |
b5bbeb23 | 727 | mtspr SPRN_SPRG1,r13 /* save r13 */ |
3c726f8d | 728 | mfspr r13,SPRN_SPRG3 /* get paca address into r13 */ |
14cf11af | 729 | std r3,PACA_EXSLB+EX_R3(r13) |
b5bbeb23 | 730 | mfspr r3,SPRN_DAR |
3c726f8d BH |
731 | std r9,PACA_EXSLB+EX_R9(r13) |
732 | mfcr r9 | |
733 | #ifdef __DISABLED__ | |
734 | cmpdi r3,0 | |
735 | bge slb_miss_user_iseries | |
736 | #endif | |
737 | std r10,PACA_EXSLB+EX_R10(r13) | |
738 | std r11,PACA_EXSLB+EX_R11(r13) | |
739 | std r12,PACA_EXSLB+EX_R12(r13) | |
740 | mfspr r10,SPRN_SPRG1 | |
741 | std r10,PACA_EXSLB+EX_R13(r13) | |
3356bb9f DG |
742 | ld r12,PACALPPACAPTR(r13) |
743 | ld r12,LPPACASRR1(r12) | |
3c726f8d | 744 | b .slb_miss_realmode |
14cf11af PM |
745 | |
746 | STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN) | |
747 | ||
748 | .globl instruction_access_slb_iSeries | |
749 | instruction_access_slb_iSeries: | |
b5bbeb23 | 750 | mtspr SPRN_SPRG1,r13 /* save r13 */ |
3c726f8d | 751 | mfspr r13,SPRN_SPRG3 /* get paca address into r13 */ |
14cf11af | 752 | std r3,PACA_EXSLB+EX_R3(r13) |
3356bb9f DG |
753 | ld r3,PACALPPACAPTR(r13) |
754 | ld r3,LPPACASRR0(r3) /* get SRR0 value */ | |
3c726f8d BH |
755 | std r9,PACA_EXSLB+EX_R9(r13) |
756 | mfcr r9 | |
757 | #ifdef __DISABLED__ | |
758 | cmpdi r3,0 | |
759 | bge .slb_miss_user_iseries | |
760 | #endif | |
761 | std r10,PACA_EXSLB+EX_R10(r13) | |
762 | std r11,PACA_EXSLB+EX_R11(r13) | |
763 | std r12,PACA_EXSLB+EX_R12(r13) | |
764 | mfspr r10,SPRN_SPRG1 | |
765 | std r10,PACA_EXSLB+EX_R13(r13) | |
3356bb9f DG |
766 | ld r12,PACALPPACAPTR(r13) |
767 | ld r12,LPPACASRR1(r12) | |
3c726f8d BH |
768 | b .slb_miss_realmode |
769 | ||
770 | #ifdef __DISABLED__ | |
771 | slb_miss_user_iseries: | |
772 | std r10,PACA_EXGEN+EX_R10(r13) | |
773 | std r11,PACA_EXGEN+EX_R11(r13) | |
774 | std r12,PACA_EXGEN+EX_R12(r13) | |
775 | mfspr r10,SPRG1 | |
776 | ld r11,PACA_EXSLB+EX_R9(r13) | |
777 | ld r12,PACA_EXSLB+EX_R3(r13) | |
778 | std r10,PACA_EXGEN+EX_R13(r13) | |
779 | std r11,PACA_EXGEN+EX_R9(r13) | |
780 | std r12,PACA_EXGEN+EX_R3(r13) | |
781 | EXCEPTION_PROLOG_ISERIES_2 | |
782 | b slb_miss_user_common | |
783 | #endif | |
14cf11af PM |
784 | |
785 | MASKABLE_EXCEPTION_ISERIES(0x500, hardware_interrupt) | |
786 | STD_EXCEPTION_ISERIES(0x600, alignment, PACA_EXGEN) | |
787 | STD_EXCEPTION_ISERIES(0x700, program_check, PACA_EXGEN) | |
788 | STD_EXCEPTION_ISERIES(0x800, fp_unavailable, PACA_EXGEN) | |
789 | MASKABLE_EXCEPTION_ISERIES(0x900, decrementer) | |
790 | STD_EXCEPTION_ISERIES(0xa00, trap_0a, PACA_EXGEN) | |
791 | STD_EXCEPTION_ISERIES(0xb00, trap_0b, PACA_EXGEN) | |
792 | ||
793 | .globl system_call_iSeries | |
794 | system_call_iSeries: | |
795 | mr r9,r13 | |
b5bbeb23 | 796 | mfspr r13,SPRN_SPRG3 |
14cf11af PM |
797 | EXCEPTION_PROLOG_ISERIES_2 |
798 | b system_call_common | |
799 | ||
800 | STD_EXCEPTION_ISERIES( 0xd00, single_step, PACA_EXGEN) | |
801 | STD_EXCEPTION_ISERIES( 0xe00, trap_0e, PACA_EXGEN) | |
802 | STD_EXCEPTION_ISERIES( 0xf00, performance_monitor, PACA_EXGEN) | |
803 | ||
804 | .globl system_reset_iSeries | |
805 | system_reset_iSeries: | |
b5bbeb23 | 806 | mfspr r13,SPRN_SPRG3 /* Get paca address */ |
14cf11af PM |
807 | mfmsr r24 |
808 | ori r24,r24,MSR_RI | |
809 | mtmsrd r24 /* RI on */ | |
810 | lhz r24,PACAPACAINDEX(r13) /* Get processor # */ | |
811 | cmpwi 0,r24,0 /* Are we processor 0? */ | |
812 | beq .__start_initialization_iSeries /* Start up the first processor */ | |
813 | mfspr r4,SPRN_CTRLF | |
814 | li r5,CTRL_RUNLATCH /* Turn off the run light */ | |
815 | andc r4,r4,r5 | |
816 | mtspr SPRN_CTRLT,r4 | |
817 | ||
818 | 1: | |
819 | HMT_LOW | |
820 | #ifdef CONFIG_SMP | |
821 | lbz r23,PACAPROCSTART(r13) /* Test if this processor | |
822 | * should start */ | |
823 | sync | |
e58c3495 | 824 | LOAD_REG_IMMEDIATE(r3,current_set) |
14cf11af PM |
825 | sldi r28,r24,3 /* get current_set[cpu#] */ |
826 | ldx r3,r3,r28 | |
827 | addi r1,r3,THREAD_SIZE | |
828 | subi r1,r1,STACK_FRAME_OVERHEAD | |
829 | ||
830 | cmpwi 0,r23,0 | |
831 | beq iSeries_secondary_smp_loop /* Loop until told to go */ | |
c705677e | 832 | bne __secondary_start /* Loop until told to go */ |
14cf11af PM |
833 | iSeries_secondary_smp_loop: |
834 | /* Let the Hypervisor know we are alive */ | |
835 | /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */ | |
836 | lis r3,0x8002 | |
837 | rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */ | |
838 | #else /* CONFIG_SMP */ | |
839 | /* Yield the processor. This is required for non-SMP kernels | |
840 | which are running on multi-threaded machines. */ | |
841 | lis r3,0x8000 | |
842 | rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */ | |
843 | addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */ | |
844 | li r4,0 /* "yield timed" */ | |
845 | li r5,-1 /* "yield forever" */ | |
846 | #endif /* CONFIG_SMP */ | |
847 | li r0,-1 /* r0=-1 indicates a Hypervisor call */ | |
848 | sc /* Invoke the hypervisor via a system call */ | |
b5bbeb23 | 849 | mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */ |
14cf11af PM |
850 | b 1b /* If SMP not configured, secondaries |
851 | * loop forever */ | |
852 | ||
14cf11af | 853 | decrementer_iSeries_masked: |
f9b4045d | 854 | /* We may not have a valid TOC pointer in here. */ |
14cf11af | 855 | li r11,1 |
3356bb9f DG |
856 | ld r12,PACALPPACAPTR(r13) |
857 | stb r11,LPPACADECRINT(r12) | |
f9b4045d ME |
858 | LOAD_REG_IMMEDIATE(r12, tb_ticks_per_jiffy) |
859 | lwz r12,0(r12) | |
14cf11af PM |
860 | mtspr SPRN_DEC,r12 |
861 | /* fall through */ | |
862 | ||
14cf11af PM |
863 | hardware_interrupt_iSeries_masked: |
864 | mtcrf 0x80,r9 /* Restore regs */ | |
3356bb9f DG |
865 | ld r12,PACALPPACAPTR(r13) |
866 | ld r11,LPPACASRR0(r12) | |
867 | ld r12,LPPACASRR1(r12) | |
b5bbeb23 PM |
868 | mtspr SPRN_SRR0,r11 |
869 | mtspr SPRN_SRR1,r12 | |
14cf11af PM |
870 | ld r9,PACA_EXGEN+EX_R9(r13) |
871 | ld r10,PACA_EXGEN+EX_R10(r13) | |
872 | ld r11,PACA_EXGEN+EX_R11(r13) | |
873 | ld r12,PACA_EXGEN+EX_R12(r13) | |
874 | ld r13,PACA_EXGEN+EX_R13(r13) | |
875 | rfid | |
876 | b . /* prevent speculative execution */ | |
877 | #endif /* CONFIG_PPC_ISERIES */ | |
878 | ||
879 | /*** Common interrupt handlers ***/ | |
880 | ||
881 | STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception) | |
882 | ||
883 | /* | |
884 | * Machine check is different because we use a different | |
885 | * save area: PACA_EXMC instead of PACA_EXGEN. | |
886 | */ | |
887 | .align 7 | |
888 | .globl machine_check_common | |
889 | machine_check_common: | |
890 | EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) | |
f39224a8 | 891 | FINISH_NAP |
14cf11af PM |
892 | DISABLE_INTS |
893 | bl .save_nvgprs | |
894 | addi r3,r1,STACK_FRAME_OVERHEAD | |
895 | bl .machine_check_exception | |
896 | b .ret_from_except | |
897 | ||
898 | STD_EXCEPTION_COMMON_LITE(0x900, decrementer, .timer_interrupt) | |
899 | STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception) | |
900 | STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception) | |
901 | STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception) | |
902 | STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception) | |
f39224a8 | 903 | STD_EXCEPTION_COMMON_IDLE(0xf00, performance_monitor, .performance_monitor_exception) |
14cf11af PM |
904 | STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception) |
905 | #ifdef CONFIG_ALTIVEC | |
906 | STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception) | |
907 | #else | |
908 | STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception) | |
909 | #endif | |
acf7d768 BH |
910 | #ifdef CONFIG_CBE_RAS |
911 | STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception) | |
912 | STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception) | |
913 | STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception) | |
914 | #endif /* CONFIG_CBE_RAS */ | |
14cf11af PM |
915 | |
916 | /* | |
917 | * Here we have detected that the kernel stack pointer is bad. | |
918 | * R9 contains the saved CR, r13 points to the paca, | |
919 | * r10 contains the (bad) kernel stack pointer, | |
920 | * r11 and r12 contain the saved SRR0 and SRR1. | |
921 | * We switch to using an emergency stack, save the registers there, | |
922 | * and call kernel_bad_stack(), which panics. | |
923 | */ | |
924 | bad_stack: | |
925 | ld r1,PACAEMERGSP(r13) | |
926 | subi r1,r1,64+INT_FRAME_SIZE | |
927 | std r9,_CCR(r1) | |
928 | std r10,GPR1(r1) | |
929 | std r11,_NIP(r1) | |
930 | std r12,_MSR(r1) | |
b5bbeb23 PM |
931 | mfspr r11,SPRN_DAR |
932 | mfspr r12,SPRN_DSISR | |
14cf11af PM |
933 | std r11,_DAR(r1) |
934 | std r12,_DSISR(r1) | |
935 | mflr r10 | |
936 | mfctr r11 | |
937 | mfxer r12 | |
938 | std r10,_LINK(r1) | |
939 | std r11,_CTR(r1) | |
940 | std r12,_XER(r1) | |
941 | SAVE_GPR(0,r1) | |
942 | SAVE_GPR(2,r1) | |
943 | SAVE_4GPRS(3,r1) | |
944 | SAVE_2GPRS(7,r1) | |
945 | SAVE_10GPRS(12,r1) | |
946 | SAVE_10GPRS(22,r1) | |
68730401 OJ |
947 | lhz r12,PACA_TRAP_SAVE(r13) |
948 | std r12,_TRAP(r1) | |
14cf11af PM |
949 | addi r11,r1,INT_FRAME_SIZE |
950 | std r11,0(r1) | |
951 | li r12,0 | |
952 | std r12,0(r11) | |
953 | ld r2,PACATOC(r13) | |
954 | 1: addi r3,r1,STACK_FRAME_OVERHEAD | |
955 | bl .kernel_bad_stack | |
956 | b 1b | |
957 | ||
958 | /* | |
959 | * Return from an exception with minimal checks. | |
960 | * The caller is assumed to have done EXCEPTION_PROLOG_COMMON. | |
961 | * If interrupts have been enabled, or anything has been | |
962 | * done that might have changed the scheduling status of | |
963 | * any task or sent any task a signal, you should use | |
964 | * ret_from_except or ret_from_except_lite instead of this. | |
965 | */ | |
b0a779de PM |
966 | fast_exc_return_irq: /* restores irq state too */ |
967 | ld r3,SOFTE(r1) | |
968 | ld r12,_MSR(r1) | |
969 | stb r3,PACASOFTIRQEN(r13) /* restore paca->soft_enabled */ | |
970 | rldicl r4,r12,49,63 /* get MSR_EE to LSB */ | |
971 | stb r4,PACAHARDIRQEN(r13) /* restore paca->hard_enabled */ | |
972 | b 1f | |
973 | ||
40ef8cbc | 974 | .globl fast_exception_return |
14cf11af PM |
975 | fast_exception_return: |
976 | ld r12,_MSR(r1) | |
b0a779de | 977 | 1: ld r11,_NIP(r1) |
14cf11af PM |
978 | andi. r3,r12,MSR_RI /* check if RI is set */ |
979 | beq- unrecov_fer | |
c6622f63 PM |
980 | |
981 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING | |
982 | andi. r3,r12,MSR_PR | |
983 | beq 2f | |
984 | ACCOUNT_CPU_USER_EXIT(r3, r4) | |
985 | 2: | |
986 | #endif | |
987 | ||
14cf11af PM |
988 | ld r3,_CCR(r1) |
989 | ld r4,_LINK(r1) | |
990 | ld r5,_CTR(r1) | |
991 | ld r6,_XER(r1) | |
992 | mtcr r3 | |
993 | mtlr r4 | |
994 | mtctr r5 | |
995 | mtxer r6 | |
996 | REST_GPR(0, r1) | |
997 | REST_8GPRS(2, r1) | |
998 | ||
999 | mfmsr r10 | |
d04c56f7 PM |
1000 | rldicl r10,r10,48,1 /* clear EE */ |
1001 | rldicr r10,r10,16,61 /* clear RI (LE is 0 already) */ | |
14cf11af PM |
1002 | mtmsrd r10,1 |
1003 | ||
b5bbeb23 PM |
1004 | mtspr SPRN_SRR1,r12 |
1005 | mtspr SPRN_SRR0,r11 | |
14cf11af PM |
1006 | REST_4GPRS(10, r1) |
1007 | ld r1,GPR1(r1) | |
1008 | rfid | |
1009 | b . /* prevent speculative execution */ | |
1010 | ||
1011 | unrecov_fer: | |
1012 | bl .save_nvgprs | |
1013 | 1: addi r3,r1,STACK_FRAME_OVERHEAD | |
1014 | bl .unrecoverable_exception | |
1015 | b 1b | |
1016 | ||
1017 | /* | |
1018 | * Here r13 points to the paca, r9 contains the saved CR, | |
1019 | * SRR0 and SRR1 are saved in r11 and r12, | |
1020 | * r9 - r13 are saved in paca->exgen. | |
1021 | */ | |
1022 | .align 7 | |
1023 | .globl data_access_common | |
1024 | data_access_common: | |
b5bbeb23 | 1025 | mfspr r10,SPRN_DAR |
14cf11af | 1026 | std r10,PACA_EXGEN+EX_DAR(r13) |
b5bbeb23 | 1027 | mfspr r10,SPRN_DSISR |
14cf11af PM |
1028 | stw r10,PACA_EXGEN+EX_DSISR(r13) |
1029 | EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) | |
1030 | ld r3,PACA_EXGEN+EX_DAR(r13) | |
1031 | lwz r4,PACA_EXGEN+EX_DSISR(r13) | |
1032 | li r5,0x300 | |
1033 | b .do_hash_page /* Try to handle as hpte fault */ | |
1034 | ||
1035 | .align 7 | |
1036 | .globl instruction_access_common | |
1037 | instruction_access_common: | |
1038 | EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) | |
1039 | ld r3,_NIP(r1) | |
1040 | andis. r4,r12,0x5820 | |
1041 | li r5,0x400 | |
1042 | b .do_hash_page /* Try to handle as hpte fault */ | |
1043 | ||
3c726f8d BH |
1044 | /* |
1045 | * Here is the common SLB miss user that is used when going to virtual | |
1046 | * mode for SLB misses, that is currently not used | |
1047 | */ | |
1048 | #ifdef __DISABLED__ | |
1049 | .align 7 | |
1050 | .globl slb_miss_user_common | |
1051 | slb_miss_user_common: | |
1052 | mflr r10 | |
1053 | std r3,PACA_EXGEN+EX_DAR(r13) | |
1054 | stw r9,PACA_EXGEN+EX_CCR(r13) | |
1055 | std r10,PACA_EXGEN+EX_LR(r13) | |
1056 | std r11,PACA_EXGEN+EX_SRR0(r13) | |
1057 | bl .slb_allocate_user | |
1058 | ||
1059 | ld r10,PACA_EXGEN+EX_LR(r13) | |
1060 | ld r3,PACA_EXGEN+EX_R3(r13) | |
1061 | lwz r9,PACA_EXGEN+EX_CCR(r13) | |
1062 | ld r11,PACA_EXGEN+EX_SRR0(r13) | |
1063 | mtlr r10 | |
1064 | beq- slb_miss_fault | |
1065 | ||
1066 | andi. r10,r12,MSR_RI /* check for unrecoverable exception */ | |
1067 | beq- unrecov_user_slb | |
1068 | mfmsr r10 | |
1069 | ||
1070 | .machine push | |
1071 | .machine "power4" | |
1072 | mtcrf 0x80,r9 | |
1073 | .machine pop | |
1074 | ||
1075 | clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */ | |
1076 | mtmsrd r10,1 | |
1077 | ||
1078 | mtspr SRR0,r11 | |
1079 | mtspr SRR1,r12 | |
1080 | ||
1081 | ld r9,PACA_EXGEN+EX_R9(r13) | |
1082 | ld r10,PACA_EXGEN+EX_R10(r13) | |
1083 | ld r11,PACA_EXGEN+EX_R11(r13) | |
1084 | ld r12,PACA_EXGEN+EX_R12(r13) | |
1085 | ld r13,PACA_EXGEN+EX_R13(r13) | |
1086 | rfid | |
1087 | b . | |
1088 | ||
1089 | slb_miss_fault: | |
1090 | EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN) | |
1091 | ld r4,PACA_EXGEN+EX_DAR(r13) | |
1092 | li r5,0 | |
1093 | std r4,_DAR(r1) | |
1094 | std r5,_DSISR(r1) | |
3ccfc65c | 1095 | b handle_page_fault |
3c726f8d BH |
1096 | |
1097 | unrecov_user_slb: | |
1098 | EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN) | |
1099 | DISABLE_INTS | |
1100 | bl .save_nvgprs | |
1101 | 1: addi r3,r1,STACK_FRAME_OVERHEAD | |
1102 | bl .unrecoverable_exception | |
1103 | b 1b | |
1104 | ||
1105 | #endif /* __DISABLED__ */ | |
1106 | ||
1107 | ||
1108 | /* | |
1109 | * r13 points to the PACA, r9 contains the saved CR, | |
1110 | * r12 contain the saved SRR1, SRR0 is still ready for return | |
1111 | * r3 has the faulting address | |
1112 | * r9 - r13 are saved in paca->exslb. | |
1113 | * r3 is saved in paca->slb_r3 | |
1114 | * We assume we aren't going to take any exceptions during this procedure. | |
1115 | */ | |
1116 | _GLOBAL(slb_miss_realmode) | |
1117 | mflr r10 | |
1118 | ||
1119 | stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ | |
1120 | std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ | |
1121 | ||
1122 | bl .slb_allocate_realmode | |
1123 | ||
1124 | /* All done -- return from exception. */ | |
1125 | ||
1126 | ld r10,PACA_EXSLB+EX_LR(r13) | |
1127 | ld r3,PACA_EXSLB+EX_R3(r13) | |
1128 | lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ | |
1129 | #ifdef CONFIG_PPC_ISERIES | |
3f639ee8 | 1130 | BEGIN_FW_FTR_SECTION |
3356bb9f DG |
1131 | ld r11,PACALPPACAPTR(r13) |
1132 | ld r11,LPPACASRR0(r11) /* get SRR0 value */ | |
3f639ee8 | 1133 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) |
3c726f8d BH |
1134 | #endif /* CONFIG_PPC_ISERIES */ |
1135 | ||
1136 | mtlr r10 | |
1137 | ||
1138 | andi. r10,r12,MSR_RI /* check for unrecoverable exception */ | |
1139 | beq- unrecov_slb | |
1140 | ||
1141 | .machine push | |
1142 | .machine "power4" | |
1143 | mtcrf 0x80,r9 | |
1144 | mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ | |
1145 | .machine pop | |
1146 | ||
1147 | #ifdef CONFIG_PPC_ISERIES | |
3f639ee8 | 1148 | BEGIN_FW_FTR_SECTION |
3c726f8d BH |
1149 | mtspr SPRN_SRR0,r11 |
1150 | mtspr SPRN_SRR1,r12 | |
3f639ee8 | 1151 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) |
3c726f8d BH |
1152 | #endif /* CONFIG_PPC_ISERIES */ |
1153 | ld r9,PACA_EXSLB+EX_R9(r13) | |
1154 | ld r10,PACA_EXSLB+EX_R10(r13) | |
1155 | ld r11,PACA_EXSLB+EX_R11(r13) | |
1156 | ld r12,PACA_EXSLB+EX_R12(r13) | |
1157 | ld r13,PACA_EXSLB+EX_R13(r13) | |
1158 | rfid | |
1159 | b . /* prevent speculative execution */ | |
1160 | ||
1161 | unrecov_slb: | |
1162 | EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) | |
1163 | DISABLE_INTS | |
1164 | bl .save_nvgprs | |
1165 | 1: addi r3,r1,STACK_FRAME_OVERHEAD | |
1166 | bl .unrecoverable_exception | |
1167 | b 1b | |
1168 | ||
14cf11af PM |
1169 | .align 7 |
1170 | .globl hardware_interrupt_common | |
1171 | .globl hardware_interrupt_entry | |
1172 | hardware_interrupt_common: | |
1173 | EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN) | |
f39224a8 | 1174 | FINISH_NAP |
14cf11af PM |
1175 | hardware_interrupt_entry: |
1176 | DISABLE_INTS | |
cb2c9b27 | 1177 | bl .ppc64_runlatch_on |
14cf11af PM |
1178 | addi r3,r1,STACK_FRAME_OVERHEAD |
1179 | bl .do_IRQ | |
1180 | b .ret_from_except_lite | |
1181 | ||
f39224a8 PM |
1182 | #ifdef CONFIG_PPC_970_NAP |
1183 | power4_fixup_nap: | |
1184 | andc r9,r9,r10 | |
1185 | std r9,TI_LOCAL_FLAGS(r11) | |
1186 | ld r10,_LINK(r1) /* make idle task do the */ | |
1187 | std r10,_NIP(r1) /* equivalent of a blr */ | |
1188 | blr | |
1189 | #endif | |
1190 | ||
14cf11af PM |
1191 | .align 7 |
1192 | .globl alignment_common | |
1193 | alignment_common: | |
b5bbeb23 | 1194 | mfspr r10,SPRN_DAR |
14cf11af | 1195 | std r10,PACA_EXGEN+EX_DAR(r13) |
b5bbeb23 | 1196 | mfspr r10,SPRN_DSISR |
14cf11af PM |
1197 | stw r10,PACA_EXGEN+EX_DSISR(r13) |
1198 | EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) | |
1199 | ld r3,PACA_EXGEN+EX_DAR(r13) | |
1200 | lwz r4,PACA_EXGEN+EX_DSISR(r13) | |
1201 | std r3,_DAR(r1) | |
1202 | std r4,_DSISR(r1) | |
1203 | bl .save_nvgprs | |
1204 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1205 | ENABLE_INTS | |
1206 | bl .alignment_exception | |
1207 | b .ret_from_except | |
1208 | ||
1209 | .align 7 | |
1210 | .globl program_check_common | |
1211 | program_check_common: | |
1212 | EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) | |
1213 | bl .save_nvgprs | |
1214 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1215 | ENABLE_INTS | |
1216 | bl .program_check_exception | |
1217 | b .ret_from_except | |
1218 | ||
1219 | .align 7 | |
1220 | .globl fp_unavailable_common | |
1221 | fp_unavailable_common: | |
1222 | EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) | |
3ccfc65c | 1223 | bne 1f /* if from user, just load it up */ |
14cf11af PM |
1224 | bl .save_nvgprs |
1225 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1226 | ENABLE_INTS | |
1227 | bl .kernel_fp_unavailable_exception | |
1228 | BUG_OPCODE | |
3ccfc65c | 1229 | 1: b .load_up_fpu |
14cf11af | 1230 | |
14cf11af PM |
1231 | .align 7 |
1232 | .globl altivec_unavailable_common | |
1233 | altivec_unavailable_common: | |
1234 | EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) | |
1235 | #ifdef CONFIG_ALTIVEC | |
1236 | BEGIN_FTR_SECTION | |
1237 | bne .load_up_altivec /* if from user, just load it up */ | |
1238 | END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) | |
1239 | #endif | |
1240 | bl .save_nvgprs | |
1241 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1242 | ENABLE_INTS | |
1243 | bl .altivec_unavailable_exception | |
1244 | b .ret_from_except | |
1245 | ||
1246 | #ifdef CONFIG_ALTIVEC | |
1247 | /* | |
1248 | * load_up_altivec(unused, unused, tsk) | |
1249 | * Disable VMX for the task which had it previously, | |
1250 | * and save its vector registers in its thread_struct. | |
1251 | * Enables the VMX for use in the kernel on return. | |
1252 | * On SMP we know the VMX is free, since we give it up every | |
1253 | * switch (ie, no lazy save of the vector registers). | |
1254 | * On entry: r13 == 'current' && last_task_used_altivec != 'current' | |
1255 | */ | |
1256 | _STATIC(load_up_altivec) | |
1257 | mfmsr r5 /* grab the current MSR */ | |
1258 | oris r5,r5,MSR_VEC@h | |
1259 | mtmsrd r5 /* enable use of VMX now */ | |
1260 | isync | |
1261 | ||
1262 | /* | |
1263 | * For SMP, we don't do lazy VMX switching because it just gets too | |
1264 | * horrendously complex, especially when a task switches from one CPU | |
1265 | * to another. Instead we call giveup_altvec in switch_to. | |
1266 | * VRSAVE isn't dealt with here, that is done in the normal context | |
1267 | * switch code. Note that we could rely on vrsave value to eventually | |
1268 | * avoid saving all of the VREGs here... | |
1269 | */ | |
1270 | #ifndef CONFIG_SMP | |
1271 | ld r3,last_task_used_altivec@got(r2) | |
1272 | ld r4,0(r3) | |
1273 | cmpdi 0,r4,0 | |
1274 | beq 1f | |
1275 | /* Save VMX state to last_task_used_altivec's THREAD struct */ | |
1276 | addi r4,r4,THREAD | |
1277 | SAVE_32VRS(0,r5,r4) | |
1278 | mfvscr vr0 | |
1279 | li r10,THREAD_VSCR | |
1280 | stvx vr0,r10,r4 | |
1281 | /* Disable VMX for last_task_used_altivec */ | |
1282 | ld r5,PT_REGS(r4) | |
1283 | ld r4,_MSR-STACK_FRAME_OVERHEAD(r5) | |
1284 | lis r6,MSR_VEC@h | |
1285 | andc r4,r4,r6 | |
1286 | std r4,_MSR-STACK_FRAME_OVERHEAD(r5) | |
1287 | 1: | |
1288 | #endif /* CONFIG_SMP */ | |
1289 | /* Hack: if we get an altivec unavailable trap with VRSAVE | |
1290 | * set to all zeros, we assume this is a broken application | |
1291 | * that fails to set it properly, and thus we switch it to | |
1292 | * all 1's | |
1293 | */ | |
1294 | mfspr r4,SPRN_VRSAVE | |
1295 | cmpdi 0,r4,0 | |
1296 | bne+ 1f | |
1297 | li r4,-1 | |
1298 | mtspr SPRN_VRSAVE,r4 | |
1299 | 1: | |
1300 | /* enable use of VMX after return */ | |
1301 | ld r4,PACACURRENT(r13) | |
1302 | addi r5,r4,THREAD /* Get THREAD */ | |
1303 | oris r12,r12,MSR_VEC@h | |
1304 | std r12,_MSR(r1) | |
1305 | li r4,1 | |
1306 | li r10,THREAD_VSCR | |
1307 | stw r4,THREAD_USED_VR(r5) | |
1308 | lvx vr0,r10,r5 | |
1309 | mtvscr vr0 | |
1310 | REST_32VRS(0,r4,r5) | |
1311 | #ifndef CONFIG_SMP | |
1312 | /* Update last_task_used_math to 'current' */ | |
1313 | subi r4,r5,THREAD /* Back to 'current' */ | |
1314 | std r4,0(r3) | |
1315 | #endif /* CONFIG_SMP */ | |
1316 | /* restore registers and return */ | |
1317 | b fast_exception_return | |
1318 | #endif /* CONFIG_ALTIVEC */ | |
1319 | ||
1320 | /* | |
1321 | * Hash table stuff | |
1322 | */ | |
1323 | .align 7 | |
1324 | _GLOBAL(do_hash_page) | |
1325 | std r3,_DAR(r1) | |
1326 | std r4,_DSISR(r1) | |
1327 | ||
1328 | andis. r0,r4,0xa450 /* weird error? */ | |
3ccfc65c | 1329 | bne- handle_page_fault /* if not, try to insert a HPTE */ |
14cf11af PM |
1330 | BEGIN_FTR_SECTION |
1331 | andis. r0,r4,0x0020 /* Is it a segment table fault? */ | |
3ccfc65c | 1332 | bne- do_ste_alloc /* If so handle it */ |
14cf11af PM |
1333 | END_FTR_SECTION_IFCLR(CPU_FTR_SLB) |
1334 | ||
1335 | /* | |
1336 | * We need to set the _PAGE_USER bit if MSR_PR is set or if we are | |
1337 | * accessing a userspace segment (even from the kernel). We assume | |
1338 | * kernel addresses always have the high bit set. | |
1339 | */ | |
1340 | rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */ | |
1341 | rotldi r0,r3,15 /* Move high bit into MSR_PR posn */ | |
1342 | orc r0,r12,r0 /* MSR_PR | ~high_bit */ | |
1343 | rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */ | |
1344 | ori r4,r4,1 /* add _PAGE_PRESENT */ | |
1345 | rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */ | |
1346 | ||
1347 | /* | |
1348 | * On iSeries, we soft-disable interrupts here, then | |
1349 | * hard-enable interrupts so that the hash_page code can spin on | |
1350 | * the hash_table_lock without problems on a shared processor. | |
1351 | */ | |
1352 | DISABLE_INTS | |
1353 | ||
1354 | /* | |
1355 | * r3 contains the faulting address | |
1356 | * r4 contains the required access permissions | |
1357 | * r5 contains the trap number | |
1358 | * | |
1359 | * at return r3 = 0 for success | |
1360 | */ | |
1361 | bl .hash_page /* build HPTE if possible */ | |
1362 | cmpdi r3,0 /* see if hash_page succeeded */ | |
1363 | ||
1364 | #ifdef DO_SOFT_DISABLE | |
3f639ee8 | 1365 | BEGIN_FW_FTR_SECTION |
14cf11af PM |
1366 | /* |
1367 | * If we had interrupts soft-enabled at the point where the | |
1368 | * DSI/ISI occurred, and an interrupt came in during hash_page, | |
1369 | * handle it now. | |
1370 | * We jump to ret_from_except_lite rather than fast_exception_return | |
1371 | * because ret_from_except_lite will check for and handle pending | |
1372 | * interrupts if necessary. | |
1373 | */ | |
3ccfc65c | 1374 | beq 13f |
b0a779de PM |
1375 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) |
1376 | #endif | |
1377 | BEGIN_FW_FTR_SECTION | |
1378 | /* | |
1379 | * Here we have interrupts hard-disabled, so it is sufficient | |
1380 | * to restore paca->{soft,hard}_enable and get out. | |
1381 | */ | |
1382 | beq fast_exc_return_irq /* Return from exception on success */ | |
1383 | END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) | |
1384 | ||
14cf11af PM |
1385 | /* For a hash failure, we don't bother re-enabling interrupts */ |
1386 | ble- 12f | |
1387 | ||
1388 | /* | |
1389 | * hash_page couldn't handle it, set soft interrupt enable back | |
1390 | * to what it was before the trap. Note that .local_irq_restore | |
1391 | * handles any interrupts pending at this point. | |
1392 | */ | |
1393 | ld r3,SOFTE(r1) | |
1394 | bl .local_irq_restore | |
1395 | b 11f | |
14cf11af PM |
1396 | |
1397 | /* Here we have a page fault that hash_page can't handle. */ | |
3ccfc65c | 1398 | handle_page_fault: |
14cf11af PM |
1399 | ENABLE_INTS |
1400 | 11: ld r4,_DAR(r1) | |
1401 | ld r5,_DSISR(r1) | |
1402 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1403 | bl .do_page_fault | |
1404 | cmpdi r3,0 | |
3ccfc65c | 1405 | beq+ 13f |
14cf11af PM |
1406 | bl .save_nvgprs |
1407 | mr r5,r3 | |
1408 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1409 | lwz r4,_DAR(r1) | |
1410 | bl .bad_page_fault | |
1411 | b .ret_from_except | |
1412 | ||
79acbb3f PM |
1413 | 13: b .ret_from_except_lite |
1414 | ||
14cf11af PM |
1415 | /* We have a page fault that hash_page could handle but HV refused |
1416 | * the PTE insertion | |
1417 | */ | |
1418 | 12: bl .save_nvgprs | |
1419 | addi r3,r1,STACK_FRAME_OVERHEAD | |
1420 | lwz r4,_DAR(r1) | |
1421 | bl .low_hash_fault | |
1422 | b .ret_from_except | |
1423 | ||
1424 | /* here we have a segment miss */ | |
3ccfc65c | 1425 | do_ste_alloc: |
14cf11af PM |
1426 | bl .ste_allocate /* try to insert stab entry */ |
1427 | cmpdi r3,0 | |
3ccfc65c PM |
1428 | bne- handle_page_fault |
1429 | b fast_exception_return | |
14cf11af PM |
1430 | |
1431 | /* | |
1432 | * r13 points to the PACA, r9 contains the saved CR, | |
1433 | * r11 and r12 contain the saved SRR0 and SRR1. | |
1434 | * r9 - r13 are saved in paca->exslb. | |
1435 | * We assume we aren't going to take any exceptions during this procedure. | |
1436 | * We assume (DAR >> 60) == 0xc. | |
1437 | */ | |
1438 | .align 7 | |
1439 | _GLOBAL(do_stab_bolted) | |
1440 | stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ | |
1441 | std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */ | |
1442 | ||
1443 | /* Hash to the primary group */ | |
1444 | ld r10,PACASTABVIRT(r13) | |
b5bbeb23 | 1445 | mfspr r11,SPRN_DAR |
14cf11af PM |
1446 | srdi r11,r11,28 |
1447 | rldimi r10,r11,7,52 /* r10 = first ste of the group */ | |
1448 | ||
1449 | /* Calculate VSID */ | |
1450 | /* This is a kernel address, so protovsid = ESID */ | |
1451 | ASM_VSID_SCRAMBLE(r11, r9) | |
1452 | rldic r9,r11,12,16 /* r9 = vsid << 12 */ | |
1453 | ||
1454 | /* Search the primary group for a free entry */ | |
1455 | 1: ld r11,0(r10) /* Test valid bit of the current ste */ | |
1456 | andi. r11,r11,0x80 | |
1457 | beq 2f | |
1458 | addi r10,r10,16 | |
1459 | andi. r11,r10,0x70 | |
1460 | bne 1b | |
1461 | ||
1462 | /* Stick for only searching the primary group for now. */ | |
1463 | /* At least for now, we use a very simple random castout scheme */ | |
1464 | /* Use the TB as a random number ; OR in 1 to avoid entry 0 */ | |
1465 | mftb r11 | |
1466 | rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */ | |
1467 | ori r11,r11,0x10 | |
1468 | ||
1469 | /* r10 currently points to an ste one past the group of interest */ | |
1470 | /* make it point to the randomly selected entry */ | |
1471 | subi r10,r10,128 | |
1472 | or r10,r10,r11 /* r10 is the entry to invalidate */ | |
1473 | ||
1474 | isync /* mark the entry invalid */ | |
1475 | ld r11,0(r10) | |
1476 | rldicl r11,r11,56,1 /* clear the valid bit */ | |
1477 | rotldi r11,r11,8 | |
1478 | std r11,0(r10) | |
1479 | sync | |
1480 | ||
1481 | clrrdi r11,r11,28 /* Get the esid part of the ste */ | |
1482 | slbie r11 | |
1483 | ||
1484 | 2: std r9,8(r10) /* Store the vsid part of the ste */ | |
1485 | eieio | |
1486 | ||
b5bbeb23 | 1487 | mfspr r11,SPRN_DAR /* Get the new esid */ |
14cf11af PM |
1488 | clrrdi r11,r11,28 /* Permits a full 32b of ESID */ |
1489 | ori r11,r11,0x90 /* Turn on valid and kp */ | |
1490 | std r11,0(r10) /* Put new entry back into the stab */ | |
1491 | ||
1492 | sync | |
1493 | ||
1494 | /* All done -- return from exception. */ | |
1495 | lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ | |
1496 | ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */ | |
1497 | ||
1498 | andi. r10,r12,MSR_RI | |
1499 | beq- unrecov_slb | |
1500 | ||
1501 | mtcrf 0x80,r9 /* restore CR */ | |
1502 | ||
1503 | mfmsr r10 | |
1504 | clrrdi r10,r10,2 | |
1505 | mtmsrd r10,1 | |
1506 | ||
b5bbeb23 PM |
1507 | mtspr SPRN_SRR0,r11 |
1508 | mtspr SPRN_SRR1,r12 | |
14cf11af PM |
1509 | ld r9,PACA_EXSLB+EX_R9(r13) |
1510 | ld r10,PACA_EXSLB+EX_R10(r13) | |
1511 | ld r11,PACA_EXSLB+EX_R11(r13) | |
1512 | ld r12,PACA_EXSLB+EX_R12(r13) | |
1513 | ld r13,PACA_EXSLB+EX_R13(r13) | |
1514 | rfid | |
1515 | b . /* prevent speculative execution */ | |
1516 | ||
14cf11af PM |
1517 | /* |
1518 | * Space for CPU0's segment table. | |
1519 | * | |
1520 | * On iSeries, the hypervisor must fill in at least one entry before | |
1521 | * we get control (with relocate on). The address is give to the hv | |
ee400b63 | 1522 | * as a page number (see xLparMap in lpardata.c), so this must be at a |
14cf11af PM |
1523 | * fixed address (the linker can't compute (u64)&initial_stab >> |
1524 | * PAGE_SHIFT). | |
1525 | */ | |
758438a7 | 1526 | . = STAB0_OFFSET /* 0x6000 */ |
14cf11af PM |
1527 | .globl initial_stab |
1528 | initial_stab: | |
1529 | .space 4096 | |
1530 | ||
1531 | /* | |
1532 | * Data area reserved for FWNMI option. | |
1533 | * This address (0x7000) is fixed by the RPA. | |
1534 | */ | |
1535 | .= 0x7000 | |
1536 | .globl fwnmi_data_area | |
1537 | fwnmi_data_area: | |
1538 | ||
1539 | /* iSeries does not use the FWNMI stuff, so it is safe to put | |
1540 | * this here, even if we later allow kernels that will boot on | |
1541 | * both pSeries and iSeries */ | |
1542 | #ifdef CONFIG_PPC_ISERIES | |
1543 | . = LPARMAP_PHYS | |
1544 | #include "lparmap.s" | |
1545 | /* | |
1546 | * This ".text" is here for old compilers that generate a trailing | |
1547 | * .note section when compiling .c files to .s | |
1548 | */ | |
1549 | .text | |
1550 | #endif /* CONFIG_PPC_ISERIES */ | |
1551 | ||
1552 | . = 0x8000 | |
1553 | ||
1554 | /* | |
f39b7a55 OJ |
1555 | * On pSeries and most other platforms, secondary processors spin |
1556 | * in the following code. | |
14cf11af PM |
1557 | * At entry, r3 = this processor's number (physical cpu id) |
1558 | */ | |
f39b7a55 | 1559 | _GLOBAL(generic_secondary_smp_init) |
14cf11af PM |
1560 | mr r24,r3 |
1561 | ||
1562 | /* turn on 64-bit mode */ | |
1563 | bl .enable_64b_mode | |
14cf11af | 1564 | |
14cf11af PM |
1565 | /* Set up a paca value for this processor. Since we have the |
1566 | * physical cpu id in r24, we need to search the pacas to find | |
1567 | * which logical id maps to our physical one. | |
1568 | */ | |
e58c3495 | 1569 | LOAD_REG_IMMEDIATE(r13, paca) /* Get base vaddr of paca array */ |
14cf11af PM |
1570 | li r5,0 /* logical cpu id */ |
1571 | 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */ | |
1572 | cmpw r6,r24 /* Compare to our id */ | |
1573 | beq 2f | |
1574 | addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */ | |
1575 | addi r5,r5,1 | |
1576 | cmpwi r5,NR_CPUS | |
1577 | blt 1b | |
1578 | ||
1579 | mr r3,r24 /* not found, copy phys to r3 */ | |
1580 | b .kexec_wait /* next kernel might do better */ | |
1581 | ||
b5bbeb23 | 1582 | 2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */ |
14cf11af PM |
1583 | /* From now on, r24 is expected to be logical cpuid */ |
1584 | mr r24,r5 | |
1585 | 3: HMT_LOW | |
1586 | lbz r23,PACAPROCSTART(r13) /* Test if this processor should */ | |
1587 | /* start. */ | |
1588 | sync | |
1589 | ||
f39b7a55 OJ |
1590 | #ifndef CONFIG_SMP |
1591 | b 3b /* Never go on non-SMP */ | |
1592 | #else | |
1593 | cmpwi 0,r23,0 | |
1594 | beq 3b /* Loop until told to go */ | |
1595 | ||
1596 | /* See if we need to call a cpu state restore handler */ | |
1597 | LOAD_REG_IMMEDIATE(r23, cur_cpu_spec) | |
1598 | ld r23,0(r23) | |
1599 | ld r23,CPU_SPEC_RESTORE(r23) | |
1600 | cmpdi 0,r23,0 | |
1601 | beq 4f | |
1602 | ld r23,0(r23) | |
1603 | mtctr r23 | |
1604 | bctrl | |
1605 | ||
1606 | 4: /* Create a temp kernel stack for use before relocation is on. */ | |
14cf11af PM |
1607 | ld r1,PACAEMERGSP(r13) |
1608 | subi r1,r1,STACK_FRAME_OVERHEAD | |
1609 | ||
c705677e | 1610 | b __secondary_start |
14cf11af | 1611 | #endif |
14cf11af PM |
1612 | |
1613 | #ifdef CONFIG_PPC_ISERIES | |
1614 | _STATIC(__start_initialization_iSeries) | |
1615 | /* Clear out the BSS */ | |
e58c3495 DG |
1616 | LOAD_REG_IMMEDIATE(r11,__bss_stop) |
1617 | LOAD_REG_IMMEDIATE(r8,__bss_start) | |
14cf11af PM |
1618 | sub r11,r11,r8 /* bss size */ |
1619 | addi r11,r11,7 /* round up to an even double word */ | |
1620 | rldicl. r11,r11,61,3 /* shift right by 3 */ | |
1621 | beq 4f | |
1622 | addi r8,r8,-8 | |
1623 | li r0,0 | |
1624 | mtctr r11 /* zero this many doublewords */ | |
1625 | 3: stdu r0,8(r8) | |
1626 | bdnz 3b | |
1627 | 4: | |
e58c3495 | 1628 | LOAD_REG_IMMEDIATE(r1,init_thread_union) |
14cf11af PM |
1629 | addi r1,r1,THREAD_SIZE |
1630 | li r0,0 | |
1631 | stdu r0,-STACK_FRAME_OVERHEAD(r1) | |
1632 | ||
e58c3495 | 1633 | LOAD_REG_IMMEDIATE(r2,__toc_start) |
14cf11af PM |
1634 | addi r2,r2,0x4000 |
1635 | addi r2,r2,0x4000 | |
1636 | ||
1637 | bl .iSeries_early_setup | |
ee400b63 | 1638 | bl .early_setup |
14cf11af PM |
1639 | |
1640 | /* relocation is on at this point */ | |
1641 | ||
1642 | b .start_here_common | |
1643 | #endif /* CONFIG_PPC_ISERIES */ | |
1644 | ||
14cf11af PM |
1645 | |
1646 | _STATIC(__mmu_off) | |
1647 | mfmsr r3 | |
1648 | andi. r0,r3,MSR_IR|MSR_DR | |
1649 | beqlr | |
1650 | andc r3,r3,r0 | |
1651 | mtspr SPRN_SRR0,r4 | |
1652 | mtspr SPRN_SRR1,r3 | |
1653 | sync | |
1654 | rfid | |
1655 | b . /* prevent speculative execution */ | |
1656 | ||
1657 | ||
1658 | /* | |
1659 | * Here is our main kernel entry point. We support currently 2 kind of entries | |
1660 | * depending on the value of r5. | |
1661 | * | |
1662 | * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content | |
1663 | * in r3...r7 | |
1664 | * | |
1665 | * r5 == NULL -> kexec style entry. r3 is a physical pointer to the | |
1666 | * DT block, r4 is a physical pointer to the kernel itself | |
1667 | * | |
1668 | */ | |
1669 | _GLOBAL(__start_initialization_multiplatform) | |
1670 | /* | |
1671 | * Are we booted from a PROM Of-type client-interface ? | |
1672 | */ | |
1673 | cmpldi cr0,r5,0 | |
1674 | bne .__boot_from_prom /* yes -> prom */ | |
1675 | ||
1676 | /* Save parameters */ | |
1677 | mr r31,r3 | |
1678 | mr r30,r4 | |
1679 | ||
1680 | /* Make sure we are running in 64 bits mode */ | |
1681 | bl .enable_64b_mode | |
1682 | ||
1683 | /* Setup some critical 970 SPRs before switching MMU off */ | |
f39b7a55 OJ |
1684 | mfspr r0,SPRN_PVR |
1685 | srwi r0,r0,16 | |
1686 | cmpwi r0,0x39 /* 970 */ | |
1687 | beq 1f | |
1688 | cmpwi r0,0x3c /* 970FX */ | |
1689 | beq 1f | |
1690 | cmpwi r0,0x44 /* 970MP */ | |
190a24f5 OJ |
1691 | beq 1f |
1692 | cmpwi r0,0x45 /* 970GX */ | |
f39b7a55 OJ |
1693 | bne 2f |
1694 | 1: bl .__cpu_preinit_ppc970 | |
1695 | 2: | |
14cf11af | 1696 | |
14cf11af | 1697 | /* Switch off MMU if not already */ |
e58c3495 | 1698 | LOAD_REG_IMMEDIATE(r4, .__after_prom_start - KERNELBASE) |
14cf11af PM |
1699 | add r4,r4,r30 |
1700 | bl .__mmu_off | |
1701 | b .__after_prom_start | |
1702 | ||
1703 | _STATIC(__boot_from_prom) | |
1704 | /* Save parameters */ | |
1705 | mr r31,r3 | |
1706 | mr r30,r4 | |
1707 | mr r29,r5 | |
1708 | mr r28,r6 | |
1709 | mr r27,r7 | |
1710 | ||
6088857b OH |
1711 | /* |
1712 | * Align the stack to 16-byte boundary | |
1713 | * Depending on the size and layout of the ELF sections in the initial | |
1714 | * boot binary, the stack pointer will be unalignet on PowerMac | |
1715 | */ | |
c05b4770 LT |
1716 | rldicr r1,r1,0,59 |
1717 | ||
14cf11af PM |
1718 | /* Make sure we are running in 64 bits mode */ |
1719 | bl .enable_64b_mode | |
1720 | ||
1721 | /* put a relocation offset into r3 */ | |
1722 | bl .reloc_offset | |
1723 | ||
e58c3495 | 1724 | LOAD_REG_IMMEDIATE(r2,__toc_start) |
14cf11af PM |
1725 | addi r2,r2,0x4000 |
1726 | addi r2,r2,0x4000 | |
1727 | ||
1728 | /* Relocate the TOC from a virt addr to a real addr */ | |
5a408329 | 1729 | add r2,r2,r3 |
14cf11af PM |
1730 | |
1731 | /* Restore parameters */ | |
1732 | mr r3,r31 | |
1733 | mr r4,r30 | |
1734 | mr r5,r29 | |
1735 | mr r6,r28 | |
1736 | mr r7,r27 | |
1737 | ||
1738 | /* Do all of the interaction with OF client interface */ | |
1739 | bl .prom_init | |
1740 | /* We never return */ | |
1741 | trap | |
1742 | ||
14cf11af PM |
1743 | _STATIC(__after_prom_start) |
1744 | ||
1745 | /* | |
758438a7 | 1746 | * We need to run with __start at physical address PHYSICAL_START. |
14cf11af PM |
1747 | * This will leave some code in the first 256B of |
1748 | * real memory, which are reserved for software use. | |
1749 | * The remainder of the first page is loaded with the fixed | |
1750 | * interrupt vectors. The next two pages are filled with | |
1751 | * unknown exception placeholders. | |
1752 | * | |
1753 | * Note: This process overwrites the OF exception vectors. | |
1754 | * r26 == relocation offset | |
1755 | * r27 == KERNELBASE | |
1756 | */ | |
1757 | bl .reloc_offset | |
1758 | mr r26,r3 | |
e58c3495 | 1759 | LOAD_REG_IMMEDIATE(r27, KERNELBASE) |
14cf11af | 1760 | |
e58c3495 | 1761 | LOAD_REG_IMMEDIATE(r3, PHYSICAL_START) /* target addr */ |
14cf11af PM |
1762 | |
1763 | // XXX FIXME: Use phys returned by OF (r30) | |
5a408329 | 1764 | add r4,r27,r26 /* source addr */ |
14cf11af PM |
1765 | /* current address of _start */ |
1766 | /* i.e. where we are running */ | |
1767 | /* the source addr */ | |
1768 | ||
d0b79c54 JX |
1769 | cmpdi r4,0 /* In some cases the loader may */ |
1770 | beq .start_here_multiplatform /* have already put us at zero */ | |
1771 | /* so we can skip the copy. */ | |
e58c3495 | 1772 | LOAD_REG_IMMEDIATE(r5,copy_to_here) /* # bytes of memory to copy */ |
14cf11af PM |
1773 | sub r5,r5,r27 |
1774 | ||
1775 | li r6,0x100 /* Start offset, the first 0x100 */ | |
1776 | /* bytes were copied earlier. */ | |
1777 | ||
1778 | bl .copy_and_flush /* copy the first n bytes */ | |
1779 | /* this includes the code being */ | |
1780 | /* executed here. */ | |
1781 | ||
e58c3495 | 1782 | LOAD_REG_IMMEDIATE(r0, 4f) /* Jump to the copy of this code */ |
14cf11af PM |
1783 | mtctr r0 /* that we just made/relocated */ |
1784 | bctr | |
1785 | ||
e58c3495 | 1786 | 4: LOAD_REG_IMMEDIATE(r5,klimit) |
5a408329 | 1787 | add r5,r5,r26 |
14cf11af PM |
1788 | ld r5,0(r5) /* get the value of klimit */ |
1789 | sub r5,r5,r27 | |
1790 | bl .copy_and_flush /* copy the rest */ | |
1791 | b .start_here_multiplatform | |
1792 | ||
14cf11af PM |
1793 | /* |
1794 | * Copy routine used to copy the kernel to start at physical address 0 | |
1795 | * and flush and invalidate the caches as needed. | |
1796 | * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset | |
1797 | * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5. | |
1798 | * | |
1799 | * Note: this routine *only* clobbers r0, r6 and lr | |
1800 | */ | |
1801 | _GLOBAL(copy_and_flush) | |
1802 | addi r5,r5,-8 | |
1803 | addi r6,r6,-8 | |
5a2fe38d | 1804 | 4: li r0,8 /* Use the smallest common */ |
14cf11af PM |
1805 | /* denominator cache line */ |
1806 | /* size. This results in */ | |
1807 | /* extra cache line flushes */ | |
1808 | /* but operation is correct. */ | |
1809 | /* Can't get cache line size */ | |
1810 | /* from NACA as it is being */ | |
1811 | /* moved too. */ | |
1812 | ||
1813 | mtctr r0 /* put # words/line in ctr */ | |
1814 | 3: addi r6,r6,8 /* copy a cache line */ | |
1815 | ldx r0,r6,r4 | |
1816 | stdx r0,r6,r3 | |
1817 | bdnz 3b | |
1818 | dcbst r6,r3 /* write it to memory */ | |
1819 | sync | |
1820 | icbi r6,r3 /* flush the icache line */ | |
1821 | cmpld 0,r6,r5 | |
1822 | blt 4b | |
1823 | sync | |
1824 | addi r5,r5,8 | |
1825 | addi r6,r6,8 | |
1826 | blr | |
1827 | ||
1828 | .align 8 | |
1829 | copy_to_here: | |
1830 | ||
1831 | #ifdef CONFIG_SMP | |
1832 | #ifdef CONFIG_PPC_PMAC | |
1833 | /* | |
1834 | * On PowerMac, secondary processors starts from the reset vector, which | |
1835 | * is temporarily turned into a call to one of the functions below. | |
1836 | */ | |
1837 | .section ".text"; | |
1838 | .align 2 ; | |
1839 | ||
35499c01 PM |
1840 | .globl __secondary_start_pmac_0 |
1841 | __secondary_start_pmac_0: | |
1842 | /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */ | |
1843 | li r24,0 | |
1844 | b 1f | |
1845 | li r24,1 | |
1846 | b 1f | |
1847 | li r24,2 | |
1848 | b 1f | |
1849 | li r24,3 | |
1850 | 1: | |
14cf11af PM |
1851 | |
1852 | _GLOBAL(pmac_secondary_start) | |
1853 | /* turn on 64-bit mode */ | |
1854 | bl .enable_64b_mode | |
14cf11af PM |
1855 | |
1856 | /* Copy some CPU settings from CPU 0 */ | |
f39b7a55 | 1857 | bl .__restore_cpu_ppc970 |
14cf11af PM |
1858 | |
1859 | /* pSeries do that early though I don't think we really need it */ | |
1860 | mfmsr r3 | |
1861 | ori r3,r3,MSR_RI | |
1862 | mtmsrd r3 /* RI on */ | |
1863 | ||
1864 | /* Set up a paca value for this processor. */ | |
e58c3495 | 1865 | LOAD_REG_IMMEDIATE(r4, paca) /* Get base vaddr of paca array */ |
14cf11af PM |
1866 | mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */ |
1867 | add r13,r13,r4 /* for this processor. */ | |
b5bbeb23 | 1868 | mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */ |
14cf11af PM |
1869 | |
1870 | /* Create a temp kernel stack for use before relocation is on. */ | |
1871 | ld r1,PACAEMERGSP(r13) | |
1872 | subi r1,r1,STACK_FRAME_OVERHEAD | |
1873 | ||
c705677e | 1874 | b __secondary_start |
14cf11af PM |
1875 | |
1876 | #endif /* CONFIG_PPC_PMAC */ | |
1877 | ||
1878 | /* | |
1879 | * This function is called after the master CPU has released the | |
1880 | * secondary processors. The execution environment is relocation off. | |
1881 | * The paca for this processor has the following fields initialized at | |
1882 | * this point: | |
1883 | * 1. Processor number | |
1884 | * 2. Segment table pointer (virtual address) | |
1885 | * On entry the following are set: | |
1886 | * r1 = stack pointer. vaddr for iSeries, raddr (temp stack) for pSeries | |
1887 | * r24 = cpu# (in Linux terms) | |
1888 | * r13 = paca virtual address | |
1889 | * SPRG3 = paca virtual address | |
1890 | */ | |
c705677e | 1891 | __secondary_start: |
799d6046 PM |
1892 | /* Set thread priority to MEDIUM */ |
1893 | HMT_MEDIUM | |
14cf11af | 1894 | |
799d6046 | 1895 | /* Load TOC */ |
14cf11af | 1896 | ld r2,PACATOC(r13) |
799d6046 PM |
1897 | |
1898 | /* Do early setup for that CPU (stab, slb, hash table pointer) */ | |
1899 | bl .early_setup_secondary | |
14cf11af PM |
1900 | |
1901 | /* Initialize the kernel stack. Just a repeat for iSeries. */ | |
e58c3495 | 1902 | LOAD_REG_ADDR(r3, current_set) |
14cf11af PM |
1903 | sldi r28,r24,3 /* get current_set[cpu#] */ |
1904 | ldx r1,r3,r28 | |
1905 | addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD | |
1906 | std r1,PACAKSAVE(r13) | |
1907 | ||
799d6046 | 1908 | /* Clear backchain so we get nice backtraces */ |
14cf11af PM |
1909 | li r7,0 |
1910 | mtlr r7 | |
1911 | ||
1912 | /* enable MMU and jump to start_secondary */ | |
e58c3495 DG |
1913 | LOAD_REG_ADDR(r3, .start_secondary_prolog) |
1914 | LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) | |
d04c56f7 | 1915 | #ifdef CONFIG_PPC_ISERIES |
3f639ee8 | 1916 | BEGIN_FW_FTR_SECTION |
14cf11af | 1917 | ori r4,r4,MSR_EE |
3f639ee8 | 1918 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) |
14cf11af | 1919 | #endif |
d04c56f7 PM |
1920 | BEGIN_FW_FTR_SECTION |
1921 | stb r7,PACASOFTIRQEN(r13) | |
1922 | stb r7,PACAHARDIRQEN(r13) | |
1923 | END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) | |
1924 | ||
b5bbeb23 PM |
1925 | mtspr SPRN_SRR0,r3 |
1926 | mtspr SPRN_SRR1,r4 | |
14cf11af PM |
1927 | rfid |
1928 | b . /* prevent speculative execution */ | |
1929 | ||
1930 | /* | |
1931 | * Running with relocation on at this point. All we want to do is | |
1932 | * zero the stack back-chain pointer before going into C code. | |
1933 | */ | |
1934 | _GLOBAL(start_secondary_prolog) | |
1935 | li r3,0 | |
1936 | std r3,0(r1) /* Zero the stack frame pointer */ | |
1937 | bl .start_secondary | |
799d6046 | 1938 | b . |
14cf11af PM |
1939 | #endif |
1940 | ||
1941 | /* | |
1942 | * This subroutine clobbers r11 and r12 | |
1943 | */ | |
1944 | _GLOBAL(enable_64b_mode) | |
1945 | mfmsr r11 /* grab the current MSR */ | |
1946 | li r12,1 | |
1947 | rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG) | |
1948 | or r11,r11,r12 | |
1949 | li r12,1 | |
1950 | rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG) | |
1951 | or r11,r11,r12 | |
1952 | mtmsrd r11 | |
1953 | isync | |
1954 | blr | |
1955 | ||
14cf11af PM |
1956 | /* |
1957 | * This is where the main kernel code starts. | |
1958 | */ | |
1959 | _STATIC(start_here_multiplatform) | |
1960 | /* get a new offset, now that the kernel has moved. */ | |
1961 | bl .reloc_offset | |
1962 | mr r26,r3 | |
1963 | ||
1964 | /* Clear out the BSS. It may have been done in prom_init, | |
1965 | * already but that's irrelevant since prom_init will soon | |
1966 | * be detached from the kernel completely. Besides, we need | |
1967 | * to clear it now for kexec-style entry. | |
1968 | */ | |
e58c3495 DG |
1969 | LOAD_REG_IMMEDIATE(r11,__bss_stop) |
1970 | LOAD_REG_IMMEDIATE(r8,__bss_start) | |
14cf11af PM |
1971 | sub r11,r11,r8 /* bss size */ |
1972 | addi r11,r11,7 /* round up to an even double word */ | |
1973 | rldicl. r11,r11,61,3 /* shift right by 3 */ | |
1974 | beq 4f | |
1975 | addi r8,r8,-8 | |
1976 | li r0,0 | |
1977 | mtctr r11 /* zero this many doublewords */ | |
1978 | 3: stdu r0,8(r8) | |
1979 | bdnz 3b | |
1980 | 4: | |
1981 | ||
1982 | mfmsr r6 | |
1983 | ori r6,r6,MSR_RI | |
1984 | mtmsrd r6 /* RI on */ | |
1985 | ||
14cf11af PM |
1986 | /* The following gets the stack and TOC set up with the regs */ |
1987 | /* pointing to the real addr of the kernel stack. This is */ | |
1988 | /* all done to support the C function call below which sets */ | |
1989 | /* up the htab. This is done because we have relocated the */ | |
1990 | /* kernel but are still running in real mode. */ | |
1991 | ||
e58c3495 | 1992 | LOAD_REG_IMMEDIATE(r3,init_thread_union) |
5a408329 | 1993 | add r3,r3,r26 |
14cf11af PM |
1994 | |
1995 | /* set up a stack pointer (physical address) */ | |
1996 | addi r1,r3,THREAD_SIZE | |
1997 | li r0,0 | |
1998 | stdu r0,-STACK_FRAME_OVERHEAD(r1) | |
1999 | ||
2000 | /* set up the TOC (physical address) */ | |
e58c3495 | 2001 | LOAD_REG_IMMEDIATE(r2,__toc_start) |
14cf11af PM |
2002 | addi r2,r2,0x4000 |
2003 | addi r2,r2,0x4000 | |
5a408329 | 2004 | add r2,r2,r26 |
14cf11af | 2005 | |
14cf11af PM |
2006 | /* Do very early kernel initializations, including initial hash table, |
2007 | * stab and slb setup before we turn on relocation. */ | |
2008 | ||
2009 | /* Restore parameters passed from prom_init/kexec */ | |
2010 | mr r3,r31 | |
2011 | bl .early_setup | |
2012 | ||
e58c3495 DG |
2013 | LOAD_REG_IMMEDIATE(r3, .start_here_common) |
2014 | LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) | |
b5bbeb23 PM |
2015 | mtspr SPRN_SRR0,r3 |
2016 | mtspr SPRN_SRR1,r4 | |
14cf11af PM |
2017 | rfid |
2018 | b . /* prevent speculative execution */ | |
14cf11af PM |
2019 | |
2020 | /* This is where all platforms converge execution */ | |
2021 | _STATIC(start_here_common) | |
2022 | /* relocation is on at this point */ | |
2023 | ||
2024 | /* The following code sets up the SP and TOC now that we are */ | |
2025 | /* running with translation enabled. */ | |
2026 | ||
e58c3495 | 2027 | LOAD_REG_IMMEDIATE(r3,init_thread_union) |
14cf11af PM |
2028 | |
2029 | /* set up the stack */ | |
2030 | addi r1,r3,THREAD_SIZE | |
2031 | li r0,0 | |
2032 | stdu r0,-STACK_FRAME_OVERHEAD(r1) | |
2033 | ||
14cf11af | 2034 | /* ptr to current */ |
e58c3495 | 2035 | LOAD_REG_IMMEDIATE(r4, init_task) |
14cf11af PM |
2036 | std r4,PACACURRENT(r13) |
2037 | ||
2038 | /* Load the TOC */ | |
2039 | ld r2,PACATOC(r13) | |
2040 | std r1,PACAKSAVE(r13) | |
2041 | ||
2042 | bl .setup_system | |
2043 | ||
2044 | /* Load up the kernel context */ | |
2045 | 5: | |
14cf11af | 2046 | li r5,0 |
d04c56f7 PM |
2047 | stb r5,PACASOFTIRQEN(r13) /* Soft Disabled */ |
2048 | #ifdef CONFIG_PPC_ISERIES | |
2049 | BEGIN_FW_FTR_SECTION | |
14cf11af PM |
2050 | mfmsr r5 |
2051 | ori r5,r5,MSR_EE /* Hard Enabled */ | |
2052 | mtmsrd r5 | |
3f639ee8 | 2053 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) |
14cf11af | 2054 | #endif |
d04c56f7 PM |
2055 | BEGIN_FW_FTR_SECTION |
2056 | stb r5,PACAHARDIRQEN(r13) | |
2057 | END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) | |
14cf11af PM |
2058 | |
2059 | bl .start_kernel | |
2060 | ||
f1870f77 AB |
2061 | /* Not reached */ |
2062 | BUG_OPCODE | |
14cf11af | 2063 | |
14cf11af PM |
2064 | /* |
2065 | * We put a few things here that have to be page-aligned. | |
2066 | * This stuff goes at the beginning of the bss, which is page-aligned. | |
2067 | */ | |
2068 | .section ".bss" | |
2069 | ||
2070 | .align PAGE_SHIFT | |
2071 | ||
2072 | .globl empty_zero_page | |
2073 | empty_zero_page: | |
2074 | .space PAGE_SIZE | |
2075 | ||
2076 | .globl swapper_pg_dir | |
2077 | swapper_pg_dir: | |
2078 | .space PAGE_SIZE | |
2079 | ||
2080 | /* | |
2081 | * This space gets a copy of optional info passed to us by the bootstrap | |
2082 | * Used to pass parameters into the kernel like root=/dev/sda1, etc. | |
2083 | */ | |
2084 | .globl cmd_line | |
2085 | cmd_line: | |
2086 | .space COMMAND_LINE_SIZE |