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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 | * | |
0ebc4cda BH |
15 | * This file contains the entry point for the 64-bit kernel along |
16 | * with some early initialization code common to all 64-bit powerpc | |
17 | * variants. | |
14cf11af PM |
18 | * |
19 | * This program is free software; you can redistribute it and/or | |
20 | * modify it under the terms of the GNU General Public License | |
21 | * as published by the Free Software Foundation; either version | |
22 | * 2 of the License, or (at your option) any later version. | |
23 | */ | |
24 | ||
14cf11af | 25 | #include <linux/threads.h> |
c141611f | 26 | #include <linux/init.h> |
b5bbeb23 | 27 | #include <asm/reg.h> |
14cf11af PM |
28 | #include <asm/page.h> |
29 | #include <asm/mmu.h> | |
14cf11af PM |
30 | #include <asm/ppc_asm.h> |
31 | #include <asm/asm-offsets.h> | |
32 | #include <asm/bug.h> | |
33 | #include <asm/cputable.h> | |
34 | #include <asm/setup.h> | |
35 | #include <asm/hvcall.h> | |
6cb7bfeb | 36 | #include <asm/thread_info.h> |
3f639ee8 | 37 | #include <asm/firmware.h> |
16a15a30 | 38 | #include <asm/page_64.h> |
945feb17 | 39 | #include <asm/irqflags.h> |
2191d657 | 40 | #include <asm/kvm_book3s_asm.h> |
46f52210 | 41 | #include <asm/ptrace.h> |
7230c564 | 42 | #include <asm/hw_irq.h> |
14cf11af | 43 | |
25985edc | 44 | /* The physical memory is laid out such that the secondary processor |
0ebc4cda BH |
45 | * spin code sits at 0x0000...0x00ff. On server, the vectors follow |
46 | * using the layout described in exceptions-64s.S | |
14cf11af PM |
47 | */ |
48 | ||
49 | /* | |
50 | * Entering into this code we make the following assumptions: | |
0ebc4cda BH |
51 | * |
52 | * For pSeries or server processors: | |
14cf11af PM |
53 | * 1. The MMU is off & open firmware is running in real mode. |
54 | * 2. The kernel is entered at __start | |
27f44888 BH |
55 | * -or- For OPAL entry: |
56 | * 1. The MMU is off, processor in HV mode, primary CPU enters at 0 | |
daea1175 BH |
57 | * with device-tree in gpr3. We also get OPAL base in r8 and |
58 | * entry in r9 for debugging purposes | |
27f44888 | 59 | * 2. Secondary processors enter at 0x60 with PIR in gpr3 |
14cf11af | 60 | * |
0ebc4cda BH |
61 | * For Book3E processors: |
62 | * 1. The MMU is on running in AS0 in a state defined in ePAPR | |
63 | * 2. The kernel is entered at __start | |
14cf11af PM |
64 | */ |
65 | ||
66 | .text | |
67 | .globl _stext | |
68 | _stext: | |
14cf11af PM |
69 | _GLOBAL(__start) |
70 | /* NOP this out unconditionally */ | |
71 | BEGIN_FTR_SECTION | |
5c0484e2 | 72 | FIXUP_ENDIAN |
b1576fec | 73 | b __start_initialization_multiplatform |
14cf11af | 74 | END_FTR_SECTION(0, 1) |
14cf11af PM |
75 | |
76 | /* Catch branch to 0 in real mode */ | |
77 | trap | |
78 | ||
2751b628 AB |
79 | /* Secondary processors spin on this value until it becomes non-zero. |
80 | * When non-zero, it contains the real address of the function the cpu | |
81 | * should jump to. | |
1f6a93e4 | 82 | */ |
7d4151b5 | 83 | .balign 8 |
14cf11af PM |
84 | .globl __secondary_hold_spinloop |
85 | __secondary_hold_spinloop: | |
86 | .llong 0x0 | |
87 | ||
88 | /* Secondary processors write this value with their cpu # */ | |
89 | /* after they enter the spin loop immediately below. */ | |
90 | .globl __secondary_hold_acknowledge | |
91 | __secondary_hold_acknowledge: | |
92 | .llong 0x0 | |
93 | ||
928a3197 | 94 | #ifdef CONFIG_RELOCATABLE |
8b8b0cc1 MM |
95 | /* This flag is set to 1 by a loader if the kernel should run |
96 | * at the loaded address instead of the linked address. This | |
97 | * is used by kexec-tools to keep the the kdump kernel in the | |
98 | * crash_kernel region. The loader is responsible for | |
99 | * observing the alignment requirement. | |
100 | */ | |
101 | /* Do not move this variable as kexec-tools knows about it. */ | |
102 | . = 0x5c | |
103 | .globl __run_at_load | |
104 | __run_at_load: | |
105 | .long 0x72756e30 /* "run0" -- relocate to 0 by default */ | |
106 | #endif | |
107 | ||
14cf11af PM |
108 | . = 0x60 |
109 | /* | |
75423b7b GL |
110 | * The following code is used to hold secondary processors |
111 | * in a spin loop after they have entered the kernel, but | |
14cf11af PM |
112 | * before the bulk of the kernel has been relocated. This code |
113 | * is relocated to physical address 0x60 before prom_init is run. | |
114 | * All of it must fit below the first exception vector at 0x100. | |
1f6a93e4 PM |
115 | * Use .globl here not _GLOBAL because we want __secondary_hold |
116 | * to be the actual text address, not a descriptor. | |
14cf11af | 117 | */ |
1f6a93e4 PM |
118 | .globl __secondary_hold |
119 | __secondary_hold: | |
5c0484e2 | 120 | FIXUP_ENDIAN |
2d27cfd3 | 121 | #ifndef CONFIG_PPC_BOOK3E |
14cf11af PM |
122 | mfmsr r24 |
123 | ori r24,r24,MSR_RI | |
124 | mtmsrd r24 /* RI on */ | |
2d27cfd3 | 125 | #endif |
f1870f77 | 126 | /* Grab our physical cpu number */ |
14cf11af | 127 | mr r24,r3 |
96f013fe JX |
128 | /* stash r4 for book3e */ |
129 | mr r25,r4 | |
14cf11af PM |
130 | |
131 | /* Tell the master cpu we're here */ | |
132 | /* Relocation is off & we are located at an address less */ | |
133 | /* than 0x100, so only need to grab low order offset. */ | |
e31aa453 | 134 | std r24,__secondary_hold_acknowledge-_stext(0) |
14cf11af PM |
135 | sync |
136 | ||
96f013fe JX |
137 | li r26,0 |
138 | #ifdef CONFIG_PPC_BOOK3E | |
139 | tovirt(r26,r26) | |
140 | #endif | |
14cf11af | 141 | /* All secondary cpus wait here until told to start. */ |
cc7efbf9 AB |
142 | 100: ld r12,__secondary_hold_spinloop-_stext(r26) |
143 | cmpdi 0,r12,0 | |
1f6a93e4 | 144 | beq 100b |
14cf11af | 145 | |
f1870f77 | 146 | #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) |
96f013fe | 147 | #ifdef CONFIG_PPC_BOOK3E |
cc7efbf9 | 148 | tovirt(r12,r12) |
cc7efbf9 AB |
149 | #endif |
150 | mtctr r12 | |
14cf11af | 151 | mr r3,r24 |
96f013fe JX |
152 | /* |
153 | * it may be the case that other platforms have r4 right to | |
154 | * begin with, this gives us some safety in case it is not | |
155 | */ | |
156 | #ifdef CONFIG_PPC_BOOK3E | |
157 | mr r4,r25 | |
158 | #else | |
2d27cfd3 | 159 | li r4,0 |
96f013fe | 160 | #endif |
dd797738 BH |
161 | /* Make sure that patched code is visible */ |
162 | isync | |
758438a7 | 163 | bctr |
14cf11af PM |
164 | #else |
165 | BUG_OPCODE | |
166 | #endif | |
14cf11af PM |
167 | |
168 | /* This value is used to mark exception frames on the stack. */ | |
169 | .section ".toc","aw" | |
170 | exception_marker: | |
171 | .tc ID_72656773_68657265[TC],0x7265677368657265 | |
172 | .text | |
173 | ||
14cf11af | 174 | /* |
0ebc4cda BH |
175 | * On server, we include the exception vectors code here as it |
176 | * relies on absolute addressing which is only possible within | |
177 | * this compilation unit | |
3c726f8d | 178 | */ |
0ebc4cda BH |
179 | #ifdef CONFIG_PPC_BOOK3S |
180 | #include "exceptions-64s.S" | |
1f6a93e4 | 181 | #endif |
3c726f8d | 182 | |
2d27cfd3 BH |
183 | _GLOBAL(generic_secondary_thread_init) |
184 | mr r24,r3 | |
185 | ||
186 | /* turn on 64-bit mode */ | |
b1576fec | 187 | bl enable_64b_mode |
2d27cfd3 BH |
188 | |
189 | /* get a valid TOC pointer, wherever we're mapped at */ | |
b1576fec | 190 | bl relative_toc |
1fbe9cf2 | 191 | tovirt(r2,r2) |
2d27cfd3 BH |
192 | |
193 | #ifdef CONFIG_PPC_BOOK3E | |
194 | /* Book3E initialization */ | |
195 | mr r3,r24 | |
b1576fec | 196 | bl book3e_secondary_thread_init |
2d27cfd3 BH |
197 | #endif |
198 | b generic_secondary_common_init | |
14cf11af PM |
199 | |
200 | /* | |
f39b7a55 OJ |
201 | * On pSeries and most other platforms, secondary processors spin |
202 | * in the following code. | |
14cf11af | 203 | * At entry, r3 = this processor's number (physical cpu id) |
2d27cfd3 BH |
204 | * |
205 | * On Book3E, r4 = 1 to indicate that the initial TLB entry for | |
206 | * this core already exists (setup via some other mechanism such | |
207 | * as SCOM before entry). | |
14cf11af | 208 | */ |
f39b7a55 | 209 | _GLOBAL(generic_secondary_smp_init) |
5c0484e2 | 210 | FIXUP_ENDIAN |
14cf11af | 211 | mr r24,r3 |
2d27cfd3 BH |
212 | mr r25,r4 |
213 | ||
14cf11af | 214 | /* turn on 64-bit mode */ |
b1576fec | 215 | bl enable_64b_mode |
14cf11af | 216 | |
2d27cfd3 | 217 | /* get a valid TOC pointer, wherever we're mapped at */ |
b1576fec | 218 | bl relative_toc |
1fbe9cf2 | 219 | tovirt(r2,r2) |
e31aa453 | 220 | |
2d27cfd3 BH |
221 | #ifdef CONFIG_PPC_BOOK3E |
222 | /* Book3E initialization */ | |
223 | mr r3,r24 | |
224 | mr r4,r25 | |
b1576fec | 225 | bl book3e_secondary_core_init |
2d27cfd3 BH |
226 | #endif |
227 | ||
228 | generic_secondary_common_init: | |
14cf11af PM |
229 | /* Set up a paca value for this processor. Since we have the |
230 | * physical cpu id in r24, we need to search the pacas to find | |
231 | * which logical id maps to our physical one. | |
232 | */ | |
1426d5a3 ME |
233 | LOAD_REG_ADDR(r13, paca) /* Load paca pointer */ |
234 | ld r13,0(r13) /* Get base vaddr of paca array */ | |
768d18ad MM |
235 | #ifndef CONFIG_SMP |
236 | addi r13,r13,PACA_SIZE /* know r13 if used accidentally */ | |
b1576fec | 237 | b kexec_wait /* wait for next kernel if !SMP */ |
768d18ad MM |
238 | #else |
239 | LOAD_REG_ADDR(r7, nr_cpu_ids) /* Load nr_cpu_ids address */ | |
240 | lwz r7,0(r7) /* also the max paca allocated */ | |
14cf11af PM |
241 | li r5,0 /* logical cpu id */ |
242 | 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */ | |
243 | cmpw r6,r24 /* Compare to our id */ | |
244 | beq 2f | |
245 | addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */ | |
246 | addi r5,r5,1 | |
768d18ad | 247 | cmpw r5,r7 /* Check if more pacas exist */ |
14cf11af PM |
248 | blt 1b |
249 | ||
250 | mr r3,r24 /* not found, copy phys to r3 */ | |
b1576fec | 251 | b kexec_wait /* next kernel might do better */ |
14cf11af | 252 | |
2dd60d79 | 253 | 2: SET_PACA(r13) |
2d27cfd3 BH |
254 | #ifdef CONFIG_PPC_BOOK3E |
255 | addi r12,r13,PACA_EXTLB /* and TLB exc frame in another */ | |
256 | mtspr SPRN_SPRG_TLB_EXFRAME,r12 | |
257 | #endif | |
258 | ||
14cf11af PM |
259 | /* From now on, r24 is expected to be logical cpuid */ |
260 | mr r24,r5 | |
b6f6b98a | 261 | |
f39b7a55 | 262 | /* See if we need to call a cpu state restore handler */ |
e31aa453 | 263 | LOAD_REG_ADDR(r23, cur_cpu_spec) |
f39b7a55 | 264 | ld r23,0(r23) |
2751b628 AB |
265 | ld r12,CPU_SPEC_RESTORE(r23) |
266 | cmpdi 0,r12,0 | |
9d07bc84 | 267 | beq 3f |
2751b628 AB |
268 | #if !defined(_CALL_ELF) || _CALL_ELF != 2 |
269 | ld r12,0(r12) | |
270 | #endif | |
cc7efbf9 | 271 | mtctr r12 |
f39b7a55 OJ |
272 | bctrl |
273 | ||
7ac87abb | 274 | 3: LOAD_REG_ADDR(r3, spinning_secondaries) /* Decrement spinning_secondaries */ |
9d07bc84 BH |
275 | lwarx r4,0,r3 |
276 | subi r4,r4,1 | |
277 | stwcx. r4,0,r3 | |
278 | bne 3b | |
279 | isync | |
280 | ||
281 | 4: HMT_LOW | |
ad0693ee BH |
282 | lbz r23,PACAPROCSTART(r13) /* Test if this processor should */ |
283 | /* start. */ | |
ad0693ee | 284 | cmpwi 0,r23,0 |
9d07bc84 | 285 | beq 4b /* Loop until told to go */ |
ad0693ee BH |
286 | |
287 | sync /* order paca.run and cur_cpu_spec */ | |
9d07bc84 | 288 | isync /* In case code patching happened */ |
ad0693ee | 289 | |
9d07bc84 | 290 | /* Create a temp kernel stack for use before relocation is on. */ |
14cf11af PM |
291 | ld r1,PACAEMERGSP(r13) |
292 | subi r1,r1,STACK_FRAME_OVERHEAD | |
293 | ||
c705677e | 294 | b __secondary_start |
768d18ad | 295 | #endif /* SMP */ |
14cf11af | 296 | |
e31aa453 PM |
297 | /* |
298 | * Turn the MMU off. | |
299 | * Assumes we're mapped EA == RA if the MMU is on. | |
300 | */ | |
2d27cfd3 | 301 | #ifdef CONFIG_PPC_BOOK3S |
6a3bab90 | 302 | __mmu_off: |
14cf11af PM |
303 | mfmsr r3 |
304 | andi. r0,r3,MSR_IR|MSR_DR | |
305 | beqlr | |
e31aa453 | 306 | mflr r4 |
14cf11af PM |
307 | andc r3,r3,r0 |
308 | mtspr SPRN_SRR0,r4 | |
309 | mtspr SPRN_SRR1,r3 | |
310 | sync | |
311 | rfid | |
312 | b . /* prevent speculative execution */ | |
2d27cfd3 | 313 | #endif |
14cf11af PM |
314 | |
315 | ||
316 | /* | |
317 | * Here is our main kernel entry point. We support currently 2 kind of entries | |
318 | * depending on the value of r5. | |
319 | * | |
320 | * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content | |
321 | * in r3...r7 | |
322 | * | |
323 | * r5 == NULL -> kexec style entry. r3 is a physical pointer to the | |
324 | * DT block, r4 is a physical pointer to the kernel itself | |
325 | * | |
326 | */ | |
6a3bab90 | 327 | __start_initialization_multiplatform: |
e31aa453 | 328 | /* Make sure we are running in 64 bits mode */ |
b1576fec | 329 | bl enable_64b_mode |
e31aa453 PM |
330 | |
331 | /* Get TOC pointer (current runtime address) */ | |
b1576fec | 332 | bl relative_toc |
e31aa453 PM |
333 | |
334 | /* find out where we are now */ | |
335 | bcl 20,31,$+4 | |
336 | 0: mflr r26 /* r26 = runtime addr here */ | |
337 | addis r26,r26,(_stext - 0b)@ha | |
338 | addi r26,r26,(_stext - 0b)@l /* current runtime base addr */ | |
339 | ||
14cf11af PM |
340 | /* |
341 | * Are we booted from a PROM Of-type client-interface ? | |
342 | */ | |
343 | cmpldi cr0,r5,0 | |
939e60f6 | 344 | beq 1f |
b1576fec | 345 | b __boot_from_prom /* yes -> prom */ |
939e60f6 | 346 | 1: |
14cf11af PM |
347 | /* Save parameters */ |
348 | mr r31,r3 | |
349 | mr r30,r4 | |
daea1175 BH |
350 | #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL |
351 | /* Save OPAL entry */ | |
352 | mr r28,r8 | |
353 | mr r29,r9 | |
354 | #endif | |
14cf11af | 355 | |
2d27cfd3 | 356 | #ifdef CONFIG_PPC_BOOK3E |
b1576fec AB |
357 | bl start_initialization_book3e |
358 | b __after_prom_start | |
2d27cfd3 | 359 | #else |
14cf11af | 360 | /* Setup some critical 970 SPRs before switching MMU off */ |
f39b7a55 OJ |
361 | mfspr r0,SPRN_PVR |
362 | srwi r0,r0,16 | |
363 | cmpwi r0,0x39 /* 970 */ | |
364 | beq 1f | |
365 | cmpwi r0,0x3c /* 970FX */ | |
366 | beq 1f | |
367 | cmpwi r0,0x44 /* 970MP */ | |
190a24f5 OJ |
368 | beq 1f |
369 | cmpwi r0,0x45 /* 970GX */ | |
f39b7a55 | 370 | bne 2f |
b1576fec | 371 | 1: bl __cpu_preinit_ppc970 |
f39b7a55 | 372 | 2: |
14cf11af | 373 | |
e31aa453 | 374 | /* Switch off MMU if not already off */ |
b1576fec AB |
375 | bl __mmu_off |
376 | b __after_prom_start | |
2d27cfd3 | 377 | #endif /* CONFIG_PPC_BOOK3E */ |
14cf11af | 378 | |
6a3bab90 | 379 | __boot_from_prom: |
28794d34 | 380 | #ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE |
14cf11af PM |
381 | /* Save parameters */ |
382 | mr r31,r3 | |
383 | mr r30,r4 | |
384 | mr r29,r5 | |
385 | mr r28,r6 | |
386 | mr r27,r7 | |
387 | ||
6088857b OH |
388 | /* |
389 | * Align the stack to 16-byte boundary | |
390 | * Depending on the size and layout of the ELF sections in the initial | |
e31aa453 | 391 | * boot binary, the stack pointer may be unaligned on PowerMac |
6088857b | 392 | */ |
c05b4770 LT |
393 | rldicr r1,r1,0,59 |
394 | ||
549e8152 PM |
395 | #ifdef CONFIG_RELOCATABLE |
396 | /* Relocate code for where we are now */ | |
397 | mr r3,r26 | |
b1576fec | 398 | bl relocate |
549e8152 PM |
399 | #endif |
400 | ||
14cf11af PM |
401 | /* Restore parameters */ |
402 | mr r3,r31 | |
403 | mr r4,r30 | |
404 | mr r5,r29 | |
405 | mr r6,r28 | |
406 | mr r7,r27 | |
407 | ||
408 | /* Do all of the interaction with OF client interface */ | |
549e8152 | 409 | mr r8,r26 |
b1576fec | 410 | bl prom_init |
28794d34 BH |
411 | #endif /* #CONFIG_PPC_OF_BOOT_TRAMPOLINE */ |
412 | ||
413 | /* We never return. We also hit that trap if trying to boot | |
414 | * from OF while CONFIG_PPC_OF_BOOT_TRAMPOLINE isn't selected */ | |
14cf11af PM |
415 | trap |
416 | ||
6a3bab90 | 417 | __after_prom_start: |
549e8152 PM |
418 | #ifdef CONFIG_RELOCATABLE |
419 | /* process relocations for the final address of the kernel */ | |
420 | lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */ | |
421 | sldi r25,r25,32 | |
8b8b0cc1 | 422 | lwz r7,__run_at_load-_stext(r26) |
928a3197 | 423 | cmplwi cr0,r7,1 /* flagged to stay where we are ? */ |
54622f10 MK |
424 | bne 1f |
425 | add r25,r25,r26 | |
54622f10 | 426 | 1: mr r3,r25 |
b1576fec | 427 | bl relocate |
549e8152 | 428 | #endif |
14cf11af PM |
429 | |
430 | /* | |
e31aa453 | 431 | * We need to run with _stext at physical address PHYSICAL_START. |
14cf11af PM |
432 | * This will leave some code in the first 256B of |
433 | * real memory, which are reserved for software use. | |
14cf11af PM |
434 | * |
435 | * Note: This process overwrites the OF exception vectors. | |
14cf11af | 436 | */ |
549e8152 | 437 | li r3,0 /* target addr */ |
2d27cfd3 BH |
438 | #ifdef CONFIG_PPC_BOOK3E |
439 | tovirt(r3,r3) /* on booke, we already run at PAGE_OFFSET */ | |
440 | #endif | |
549e8152 | 441 | mr. r4,r26 /* In some cases the loader may */ |
e31aa453 | 442 | beq 9f /* have already put us at zero */ |
14cf11af PM |
443 | li r6,0x100 /* Start offset, the first 0x100 */ |
444 | /* bytes were copied earlier. */ | |
2d27cfd3 BH |
445 | #ifdef CONFIG_PPC_BOOK3E |
446 | tovirt(r6,r6) /* on booke, we already run at PAGE_OFFSET */ | |
447 | #endif | |
14cf11af | 448 | |
11ee7e99 | 449 | #ifdef CONFIG_RELOCATABLE |
54622f10 MK |
450 | /* |
451 | * Check if the kernel has to be running as relocatable kernel based on the | |
8b8b0cc1 | 452 | * variable __run_at_load, if it is set the kernel is treated as relocatable |
54622f10 MK |
453 | * kernel, otherwise it will be moved to PHYSICAL_START |
454 | */ | |
8b8b0cc1 MM |
455 | lwz r7,__run_at_load-_stext(r26) |
456 | cmplwi cr0,r7,1 | |
54622f10 MK |
457 | bne 3f |
458 | ||
c1fb6816 MN |
459 | /* just copy interrupts */ |
460 | LOAD_REG_IMMEDIATE(r5, __end_interrupts - _stext) | |
54622f10 MK |
461 | b 5f |
462 | 3: | |
463 | #endif | |
464 | lis r5,(copy_to_here - _stext)@ha | |
465 | addi r5,r5,(copy_to_here - _stext)@l /* # bytes of memory to copy */ | |
466 | ||
b1576fec | 467 | bl copy_and_flush /* copy the first n bytes */ |
14cf11af PM |
468 | /* this includes the code being */ |
469 | /* executed here. */ | |
e31aa453 | 470 | addis r8,r3,(4f - _stext)@ha /* Jump to the copy of this code */ |
cc7efbf9 AB |
471 | addi r12,r8,(4f - _stext)@l /* that we just made */ |
472 | mtctr r12 | |
14cf11af PM |
473 | bctr |
474 | ||
286e4f90 | 475 | .balign 8 |
54622f10 MK |
476 | p_end: .llong _end - _stext |
477 | ||
e31aa453 PM |
478 | 4: /* Now copy the rest of the kernel up to _end */ |
479 | addis r5,r26,(p_end - _stext)@ha | |
480 | ld r5,(p_end - _stext)@l(r5) /* get _end */ | |
b1576fec | 481 | 5: bl copy_and_flush /* copy the rest */ |
e31aa453 | 482 | |
b1576fec | 483 | 9: b start_here_multiplatform |
e31aa453 | 484 | |
14cf11af PM |
485 | /* |
486 | * Copy routine used to copy the kernel to start at physical address 0 | |
487 | * and flush and invalidate the caches as needed. | |
488 | * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset | |
489 | * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5. | |
490 | * | |
491 | * Note: this routine *only* clobbers r0, r6 and lr | |
492 | */ | |
493 | _GLOBAL(copy_and_flush) | |
494 | addi r5,r5,-8 | |
495 | addi r6,r6,-8 | |
5a2fe38d | 496 | 4: li r0,8 /* Use the smallest common */ |
14cf11af PM |
497 | /* denominator cache line */ |
498 | /* size. This results in */ | |
499 | /* extra cache line flushes */ | |
500 | /* but operation is correct. */ | |
501 | /* Can't get cache line size */ | |
502 | /* from NACA as it is being */ | |
503 | /* moved too. */ | |
504 | ||
505 | mtctr r0 /* put # words/line in ctr */ | |
506 | 3: addi r6,r6,8 /* copy a cache line */ | |
507 | ldx r0,r6,r4 | |
508 | stdx r0,r6,r3 | |
509 | bdnz 3b | |
510 | dcbst r6,r3 /* write it to memory */ | |
511 | sync | |
512 | icbi r6,r3 /* flush the icache line */ | |
513 | cmpld 0,r6,r5 | |
514 | blt 4b | |
515 | sync | |
516 | addi r5,r5,8 | |
517 | addi r6,r6,8 | |
29ce3c50 | 518 | isync |
14cf11af PM |
519 | blr |
520 | ||
521 | .align 8 | |
522 | copy_to_here: | |
523 | ||
524 | #ifdef CONFIG_SMP | |
525 | #ifdef CONFIG_PPC_PMAC | |
526 | /* | |
527 | * On PowerMac, secondary processors starts from the reset vector, which | |
528 | * is temporarily turned into a call to one of the functions below. | |
529 | */ | |
530 | .section ".text"; | |
531 | .align 2 ; | |
532 | ||
35499c01 PM |
533 | .globl __secondary_start_pmac_0 |
534 | __secondary_start_pmac_0: | |
535 | /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */ | |
536 | li r24,0 | |
537 | b 1f | |
538 | li r24,1 | |
539 | b 1f | |
540 | li r24,2 | |
541 | b 1f | |
542 | li r24,3 | |
543 | 1: | |
14cf11af PM |
544 | |
545 | _GLOBAL(pmac_secondary_start) | |
546 | /* turn on 64-bit mode */ | |
b1576fec | 547 | bl enable_64b_mode |
14cf11af | 548 | |
c478b581 BH |
549 | li r0,0 |
550 | mfspr r3,SPRN_HID4 | |
551 | rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ | |
552 | sync | |
553 | mtspr SPRN_HID4,r3 | |
554 | isync | |
555 | sync | |
556 | slbia | |
557 | ||
e31aa453 | 558 | /* get TOC pointer (real address) */ |
b1576fec | 559 | bl relative_toc |
1fbe9cf2 | 560 | tovirt(r2,r2) |
e31aa453 | 561 | |
14cf11af | 562 | /* Copy some CPU settings from CPU 0 */ |
b1576fec | 563 | bl __restore_cpu_ppc970 |
14cf11af PM |
564 | |
565 | /* pSeries do that early though I don't think we really need it */ | |
566 | mfmsr r3 | |
567 | ori r3,r3,MSR_RI | |
568 | mtmsrd r3 /* RI on */ | |
569 | ||
570 | /* Set up a paca value for this processor. */ | |
1426d5a3 ME |
571 | LOAD_REG_ADDR(r4,paca) /* Load paca pointer */ |
572 | ld r4,0(r4) /* Get base vaddr of paca array */ | |
e31aa453 | 573 | mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */ |
14cf11af | 574 | add r13,r13,r4 /* for this processor. */ |
2dd60d79 | 575 | SET_PACA(r13) /* Save vaddr of paca in an SPRG*/ |
14cf11af | 576 | |
62cc67b9 BH |
577 | /* Mark interrupts soft and hard disabled (they might be enabled |
578 | * in the PACA when doing hotplug) | |
579 | */ | |
580 | li r0,0 | |
581 | stb r0,PACASOFTIRQEN(r13) | |
7230c564 BH |
582 | li r0,PACA_IRQ_HARD_DIS |
583 | stb r0,PACAIRQHAPPENED(r13) | |
62cc67b9 | 584 | |
14cf11af PM |
585 | /* Create a temp kernel stack for use before relocation is on. */ |
586 | ld r1,PACAEMERGSP(r13) | |
587 | subi r1,r1,STACK_FRAME_OVERHEAD | |
588 | ||
c705677e | 589 | b __secondary_start |
14cf11af PM |
590 | |
591 | #endif /* CONFIG_PPC_PMAC */ | |
592 | ||
593 | /* | |
594 | * This function is called after the master CPU has released the | |
595 | * secondary processors. The execution environment is relocation off. | |
596 | * The paca for this processor has the following fields initialized at | |
597 | * this point: | |
598 | * 1. Processor number | |
599 | * 2. Segment table pointer (virtual address) | |
600 | * On entry the following are set: | |
4f8cf36f | 601 | * r1 = stack pointer (real addr of temp stack) |
ee43eb78 BH |
602 | * r24 = cpu# (in Linux terms) |
603 | * r13 = paca virtual address | |
604 | * SPRG_PACA = paca virtual address | |
14cf11af | 605 | */ |
2d27cfd3 BH |
606 | .section ".text"; |
607 | .align 2 ; | |
608 | ||
fc68e869 | 609 | .globl __secondary_start |
c705677e | 610 | __secondary_start: |
799d6046 PM |
611 | /* Set thread priority to MEDIUM */ |
612 | HMT_MEDIUM | |
14cf11af | 613 | |
4f8cf36f | 614 | /* Initialize the kernel stack */ |
e58c3495 | 615 | LOAD_REG_ADDR(r3, current_set) |
14cf11af | 616 | sldi r28,r24,3 /* get current_set[cpu#] */ |
54a83404 MN |
617 | ldx r14,r3,r28 |
618 | addi r14,r14,THREAD_SIZE-STACK_FRAME_OVERHEAD | |
619 | std r14,PACAKSAVE(r13) | |
14cf11af | 620 | |
f761622e | 621 | /* Do early setup for that CPU (stab, slb, hash table pointer) */ |
b1576fec | 622 | bl early_setup_secondary |
f761622e | 623 | |
54a83404 MN |
624 | /* |
625 | * setup the new stack pointer, but *don't* use this until | |
626 | * translation is on. | |
627 | */ | |
628 | mr r1, r14 | |
629 | ||
799d6046 | 630 | /* Clear backchain so we get nice backtraces */ |
14cf11af PM |
631 | li r7,0 |
632 | mtlr r7 | |
633 | ||
7230c564 BH |
634 | /* Mark interrupts soft and hard disabled (they might be enabled |
635 | * in the PACA when doing hotplug) | |
636 | */ | |
4f8cf36f | 637 | stb r7,PACASOFTIRQEN(r13) |
7230c564 BH |
638 | li r0,PACA_IRQ_HARD_DIS |
639 | stb r0,PACAIRQHAPPENED(r13) | |
4f8cf36f | 640 | |
14cf11af | 641 | /* enable MMU and jump to start_secondary */ |
ad0289e4 | 642 | LOAD_REG_ADDR(r3, start_secondary_prolog) |
e58c3495 | 643 | LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) |
d04c56f7 | 644 | |
b5bbeb23 PM |
645 | mtspr SPRN_SRR0,r3 |
646 | mtspr SPRN_SRR1,r4 | |
2d27cfd3 | 647 | RFI |
14cf11af PM |
648 | b . /* prevent speculative execution */ |
649 | ||
650 | /* | |
651 | * Running with relocation on at this point. All we want to do is | |
e31aa453 PM |
652 | * zero the stack back-chain pointer and get the TOC virtual address |
653 | * before going into C code. | |
14cf11af | 654 | */ |
ad0289e4 | 655 | start_secondary_prolog: |
e31aa453 | 656 | ld r2,PACATOC(r13) |
14cf11af PM |
657 | li r3,0 |
658 | std r3,0(r1) /* Zero the stack frame pointer */ | |
b1576fec | 659 | bl start_secondary |
799d6046 | 660 | b . |
8dbce53c VS |
661 | /* |
662 | * Reset stack pointer and call start_secondary | |
663 | * to continue with online operation when woken up | |
664 | * from cede in cpu offline. | |
665 | */ | |
666 | _GLOBAL(start_secondary_resume) | |
667 | ld r1,PACAKSAVE(r13) /* Reload kernel stack pointer */ | |
668 | li r3,0 | |
669 | std r3,0(r1) /* Zero the stack frame pointer */ | |
b1576fec | 670 | bl start_secondary |
8dbce53c | 671 | b . |
14cf11af PM |
672 | #endif |
673 | ||
674 | /* | |
675 | * This subroutine clobbers r11 and r12 | |
676 | */ | |
6a3bab90 | 677 | enable_64b_mode: |
14cf11af | 678 | mfmsr r11 /* grab the current MSR */ |
2d27cfd3 BH |
679 | #ifdef CONFIG_PPC_BOOK3E |
680 | oris r11,r11,0x8000 /* CM bit set, we'll set ICM later */ | |
681 | mtmsr r11 | |
682 | #else /* CONFIG_PPC_BOOK3E */ | |
9f0b0793 | 683 | li r12,(MSR_64BIT | MSR_ISF)@highest |
e31aa453 | 684 | sldi r12,r12,48 |
14cf11af PM |
685 | or r11,r11,r12 |
686 | mtmsrd r11 | |
687 | isync | |
2d27cfd3 | 688 | #endif |
14cf11af PM |
689 | blr |
690 | ||
e31aa453 PM |
691 | /* |
692 | * This puts the TOC pointer into r2, offset by 0x8000 (as expected | |
693 | * by the toolchain). It computes the correct value for wherever we | |
694 | * are running at the moment, using position-independent code. | |
1fbe9cf2 AB |
695 | * |
696 | * Note: The compiler constructs pointers using offsets from the | |
697 | * TOC in -mcmodel=medium mode. After we relocate to 0 but before | |
698 | * the MMU is on we need our TOC to be a virtual address otherwise | |
699 | * these pointers will be real addresses which may get stored and | |
700 | * accessed later with the MMU on. We use tovirt() at the call | |
701 | * sites to handle this. | |
e31aa453 PM |
702 | */ |
703 | _GLOBAL(relative_toc) | |
704 | mflr r0 | |
705 | bcl 20,31,$+4 | |
e550592e BH |
706 | 0: mflr r11 |
707 | ld r2,(p_toc - 0b)(r11) | |
708 | add r2,r2,r11 | |
e31aa453 PM |
709 | mtlr r0 |
710 | blr | |
711 | ||
5b63fee1 | 712 | .balign 8 |
e31aa453 PM |
713 | p_toc: .llong __toc_start + 0x8000 - 0b |
714 | ||
14cf11af PM |
715 | /* |
716 | * This is where the main kernel code starts. | |
717 | */ | |
6a3bab90 | 718 | start_here_multiplatform: |
1fbe9cf2 | 719 | /* set up the TOC */ |
b1576fec | 720 | bl relative_toc |
1fbe9cf2 | 721 | tovirt(r2,r2) |
14cf11af PM |
722 | |
723 | /* Clear out the BSS. It may have been done in prom_init, | |
724 | * already but that's irrelevant since prom_init will soon | |
725 | * be detached from the kernel completely. Besides, we need | |
726 | * to clear it now for kexec-style entry. | |
727 | */ | |
e31aa453 PM |
728 | LOAD_REG_ADDR(r11,__bss_stop) |
729 | LOAD_REG_ADDR(r8,__bss_start) | |
14cf11af PM |
730 | sub r11,r11,r8 /* bss size */ |
731 | addi r11,r11,7 /* round up to an even double word */ | |
e31aa453 | 732 | srdi. r11,r11,3 /* shift right by 3 */ |
14cf11af PM |
733 | beq 4f |
734 | addi r8,r8,-8 | |
735 | li r0,0 | |
736 | mtctr r11 /* zero this many doublewords */ | |
737 | 3: stdu r0,8(r8) | |
738 | bdnz 3b | |
739 | 4: | |
740 | ||
daea1175 BH |
741 | #ifdef CONFIG_PPC_EARLY_DEBUG_OPAL |
742 | /* Setup OPAL entry */ | |
ab7f961a | 743 | LOAD_REG_ADDR(r11, opal) |
daea1175 BH |
744 | std r28,0(r11); |
745 | std r29,8(r11); | |
746 | #endif | |
747 | ||
2d27cfd3 | 748 | #ifndef CONFIG_PPC_BOOK3E |
14cf11af PM |
749 | mfmsr r6 |
750 | ori r6,r6,MSR_RI | |
751 | mtmsrd r6 /* RI on */ | |
2d27cfd3 | 752 | #endif |
14cf11af | 753 | |
549e8152 PM |
754 | #ifdef CONFIG_RELOCATABLE |
755 | /* Save the physical address we're running at in kernstart_addr */ | |
756 | LOAD_REG_ADDR(r4, kernstart_addr) | |
757 | clrldi r0,r25,2 | |
758 | std r0,0(r4) | |
759 | #endif | |
760 | ||
e31aa453 | 761 | /* The following gets the stack set up with the regs */ |
14cf11af PM |
762 | /* pointing to the real addr of the kernel stack. This is */ |
763 | /* all done to support the C function call below which sets */ | |
764 | /* up the htab. This is done because we have relocated the */ | |
765 | /* kernel but are still running in real mode. */ | |
766 | ||
e31aa453 | 767 | LOAD_REG_ADDR(r3,init_thread_union) |
14cf11af | 768 | |
e31aa453 | 769 | /* set up a stack pointer */ |
14cf11af PM |
770 | addi r1,r3,THREAD_SIZE |
771 | li r0,0 | |
772 | stdu r0,-STACK_FRAME_OVERHEAD(r1) | |
773 | ||
14cf11af PM |
774 | /* Do very early kernel initializations, including initial hash table, |
775 | * stab and slb setup before we turn on relocation. */ | |
776 | ||
777 | /* Restore parameters passed from prom_init/kexec */ | |
778 | mr r3,r31 | |
b1576fec | 779 | bl early_setup /* also sets r13 and SPRG_PACA */ |
14cf11af | 780 | |
ad0289e4 | 781 | LOAD_REG_ADDR(r3, start_here_common) |
e31aa453 | 782 | ld r4,PACAKMSR(r13) |
b5bbeb23 PM |
783 | mtspr SPRN_SRR0,r3 |
784 | mtspr SPRN_SRR1,r4 | |
2d27cfd3 | 785 | RFI |
14cf11af | 786 | b . /* prevent speculative execution */ |
14cf11af PM |
787 | |
788 | /* This is where all platforms converge execution */ | |
ad0289e4 AB |
789 | |
790 | start_here_common: | |
14cf11af | 791 | /* relocation is on at this point */ |
e31aa453 | 792 | std r1,PACAKSAVE(r13) |
14cf11af | 793 | |
e31aa453 | 794 | /* Load the TOC (virtual address) */ |
14cf11af | 795 | ld r2,PACATOC(r13) |
14cf11af | 796 | |
7230c564 | 797 | /* Do more system initializations in virtual mode */ |
b1576fec | 798 | bl setup_system |
14cf11af | 799 | |
7230c564 BH |
800 | /* Mark interrupts soft and hard disabled (they might be enabled |
801 | * in the PACA when doing hotplug) | |
802 | */ | |
803 | li r0,0 | |
804 | stb r0,PACASOFTIRQEN(r13) | |
805 | li r0,PACA_IRQ_HARD_DIS | |
806 | stb r0,PACAIRQHAPPENED(r13) | |
14cf11af | 807 | |
7230c564 | 808 | /* Generic kernel entry */ |
b1576fec | 809 | bl start_kernel |
14cf11af | 810 | |
f1870f77 AB |
811 | /* Not reached */ |
812 | BUG_OPCODE | |
14cf11af | 813 | |
14cf11af PM |
814 | /* |
815 | * We put a few things here that have to be page-aligned. | |
816 | * This stuff goes at the beginning of the bss, which is page-aligned. | |
817 | */ | |
818 | .section ".bss" | |
819 | ||
820 | .align PAGE_SHIFT | |
821 | ||
822 | .globl empty_zero_page | |
823 | empty_zero_page: | |
824 | .space PAGE_SIZE | |
825 | ||
826 | .globl swapper_pg_dir | |
827 | swapper_pg_dir: | |
ee7a76da | 828 | .space PGD_TABLE_SIZE |