Commit | Line | Data |
---|---|---|
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> |
b5bbeb23 | 26 | #include <asm/reg.h> |
14cf11af PM |
27 | #include <asm/page.h> |
28 | #include <asm/mmu.h> | |
14cf11af PM |
29 | #include <asm/ppc_asm.h> |
30 | #include <asm/asm-offsets.h> | |
31 | #include <asm/bug.h> | |
32 | #include <asm/cputable.h> | |
33 | #include <asm/setup.h> | |
34 | #include <asm/hvcall.h> | |
c43a55ff | 35 | #include <asm/iseries/lpar_map.h> |
6cb7bfeb | 36 | #include <asm/thread_info.h> |
3f639ee8 | 37 | #include <asm/firmware.h> |
16a15a30 | 38 | #include <asm/page_64.h> |
f9ff0f30 | 39 | #include <asm/exception.h> |
945feb17 | 40 | #include <asm/irqflags.h> |
14cf11af | 41 | |
0ebc4cda BH |
42 | /* The physical memory is layed out such that the secondary processor |
43 | * spin code sits at 0x0000...0x00ff. On server, the vectors follow | |
44 | * using the layout described in exceptions-64s.S | |
14cf11af PM |
45 | */ |
46 | ||
47 | /* | |
48 | * Entering into this code we make the following assumptions: | |
0ebc4cda BH |
49 | * |
50 | * For pSeries or server processors: | |
14cf11af PM |
51 | * 1. The MMU is off & open firmware is running in real mode. |
52 | * 2. The kernel is entered at __start | |
53 | * | |
54 | * For iSeries: | |
55 | * 1. The MMU is on (as it always is for iSeries) | |
56 | * 2. The kernel is entered at system_reset_iSeries | |
0ebc4cda BH |
57 | * |
58 | * For Book3E processors: | |
59 | * 1. The MMU is on running in AS0 in a state defined in ePAPR | |
60 | * 2. The kernel is entered at __start | |
14cf11af PM |
61 | */ |
62 | ||
63 | .text | |
64 | .globl _stext | |
65 | _stext: | |
14cf11af PM |
66 | _GLOBAL(__start) |
67 | /* NOP this out unconditionally */ | |
68 | BEGIN_FTR_SECTION | |
b85a046a | 69 | b .__start_initialization_multiplatform |
14cf11af | 70 | END_FTR_SECTION(0, 1) |
14cf11af PM |
71 | |
72 | /* Catch branch to 0 in real mode */ | |
73 | trap | |
74 | ||
1f6a93e4 PM |
75 | /* Secondary processors spin on this value until it becomes nonzero. |
76 | * When it does it contains the real address of the descriptor | |
77 | * of the function that the cpu should jump to to continue | |
78 | * initialization. | |
79 | */ | |
14cf11af PM |
80 | .globl __secondary_hold_spinloop |
81 | __secondary_hold_spinloop: | |
82 | .llong 0x0 | |
83 | ||
84 | /* Secondary processors write this value with their cpu # */ | |
85 | /* after they enter the spin loop immediately below. */ | |
86 | .globl __secondary_hold_acknowledge | |
87 | __secondary_hold_acknowledge: | |
88 | .llong 0x0 | |
89 | ||
1dce0e30 ME |
90 | #ifdef CONFIG_PPC_ISERIES |
91 | /* | |
92 | * At offset 0x20, there is a pointer to iSeries LPAR data. | |
93 | * This is required by the hypervisor | |
94 | */ | |
95 | . = 0x20 | |
96 | .llong hvReleaseData-KERNELBASE | |
97 | #endif /* CONFIG_PPC_ISERIES */ | |
98 | ||
8b8b0cc1 MM |
99 | #ifdef CONFIG_CRASH_DUMP |
100 | /* This flag is set to 1 by a loader if the kernel should run | |
101 | * at the loaded address instead of the linked address. This | |
102 | * is used by kexec-tools to keep the the kdump kernel in the | |
103 | * crash_kernel region. The loader is responsible for | |
104 | * observing the alignment requirement. | |
105 | */ | |
106 | /* Do not move this variable as kexec-tools knows about it. */ | |
107 | . = 0x5c | |
108 | .globl __run_at_load | |
109 | __run_at_load: | |
110 | .long 0x72756e30 /* "run0" -- relocate to 0 by default */ | |
111 | #endif | |
112 | ||
14cf11af PM |
113 | . = 0x60 |
114 | /* | |
75423b7b GL |
115 | * The following code is used to hold secondary processors |
116 | * in a spin loop after they have entered the kernel, but | |
14cf11af PM |
117 | * before the bulk of the kernel has been relocated. This code |
118 | * is relocated to physical address 0x60 before prom_init is run. | |
119 | * All of it must fit below the first exception vector at 0x100. | |
1f6a93e4 PM |
120 | * Use .globl here not _GLOBAL because we want __secondary_hold |
121 | * to be the actual text address, not a descriptor. | |
14cf11af | 122 | */ |
1f6a93e4 PM |
123 | .globl __secondary_hold |
124 | __secondary_hold: | |
14cf11af PM |
125 | mfmsr r24 |
126 | ori r24,r24,MSR_RI | |
127 | mtmsrd r24 /* RI on */ | |
128 | ||
f1870f77 | 129 | /* Grab our physical cpu number */ |
14cf11af PM |
130 | mr r24,r3 |
131 | ||
132 | /* Tell the master cpu we're here */ | |
133 | /* Relocation is off & we are located at an address less */ | |
134 | /* than 0x100, so only need to grab low order offset. */ | |
e31aa453 | 135 | std r24,__secondary_hold_acknowledge-_stext(0) |
14cf11af PM |
136 | sync |
137 | ||
138 | /* All secondary cpus wait here until told to start. */ | |
e31aa453 | 139 | 100: ld r4,__secondary_hold_spinloop-_stext(0) |
1f6a93e4 PM |
140 | cmpdi 0,r4,0 |
141 | beq 100b | |
14cf11af | 142 | |
f1870f77 | 143 | #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) |
1f6a93e4 | 144 | ld r4,0(r4) /* deref function descriptor */ |
758438a7 | 145 | mtctr r4 |
14cf11af | 146 | mr r3,r24 |
758438a7 | 147 | bctr |
14cf11af PM |
148 | #else |
149 | BUG_OPCODE | |
150 | #endif | |
14cf11af PM |
151 | |
152 | /* This value is used to mark exception frames on the stack. */ | |
153 | .section ".toc","aw" | |
154 | exception_marker: | |
155 | .tc ID_72656773_68657265[TC],0x7265677368657265 | |
156 | .text | |
157 | ||
14cf11af | 158 | /* |
0ebc4cda BH |
159 | * On server, we include the exception vectors code here as it |
160 | * relies on absolute addressing which is only possible within | |
161 | * this compilation unit | |
3c726f8d | 162 | */ |
0ebc4cda BH |
163 | #ifdef CONFIG_PPC_BOOK3S |
164 | #include "exceptions-64s.S" | |
1f6a93e4 | 165 | #endif |
3c726f8d | 166 | |
14cf11af PM |
167 | |
168 | /* | |
f39b7a55 OJ |
169 | * On pSeries and most other platforms, secondary processors spin |
170 | * in the following code. | |
14cf11af PM |
171 | * At entry, r3 = this processor's number (physical cpu id) |
172 | */ | |
f39b7a55 | 173 | _GLOBAL(generic_secondary_smp_init) |
14cf11af PM |
174 | mr r24,r3 |
175 | ||
176 | /* turn on 64-bit mode */ | |
177 | bl .enable_64b_mode | |
14cf11af | 178 | |
e31aa453 PM |
179 | /* get the TOC pointer (real address) */ |
180 | bl .relative_toc | |
181 | ||
14cf11af PM |
182 | /* Set up a paca value for this processor. Since we have the |
183 | * physical cpu id in r24, we need to search the pacas to find | |
184 | * which logical id maps to our physical one. | |
185 | */ | |
e31aa453 | 186 | LOAD_REG_ADDR(r13, paca) /* Get base vaddr of paca array */ |
14cf11af PM |
187 | li r5,0 /* logical cpu id */ |
188 | 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */ | |
189 | cmpw r6,r24 /* Compare to our id */ | |
190 | beq 2f | |
191 | addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */ | |
192 | addi r5,r5,1 | |
193 | cmpwi r5,NR_CPUS | |
194 | blt 1b | |
195 | ||
196 | mr r3,r24 /* not found, copy phys to r3 */ | |
197 | b .kexec_wait /* next kernel might do better */ | |
198 | ||
b5bbeb23 | 199 | 2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */ |
14cf11af PM |
200 | /* From now on, r24 is expected to be logical cpuid */ |
201 | mr r24,r5 | |
202 | 3: HMT_LOW | |
203 | lbz r23,PACAPROCSTART(r13) /* Test if this processor should */ | |
204 | /* start. */ | |
14cf11af | 205 | |
f39b7a55 OJ |
206 | #ifndef CONFIG_SMP |
207 | b 3b /* Never go on non-SMP */ | |
208 | #else | |
209 | cmpwi 0,r23,0 | |
210 | beq 3b /* Loop until told to go */ | |
211 | ||
b6f6b98a SR |
212 | sync /* order paca.run and cur_cpu_spec */ |
213 | ||
f39b7a55 | 214 | /* See if we need to call a cpu state restore handler */ |
e31aa453 | 215 | LOAD_REG_ADDR(r23, cur_cpu_spec) |
f39b7a55 OJ |
216 | ld r23,0(r23) |
217 | ld r23,CPU_SPEC_RESTORE(r23) | |
218 | cmpdi 0,r23,0 | |
219 | beq 4f | |
220 | ld r23,0(r23) | |
221 | mtctr r23 | |
222 | bctrl | |
223 | ||
224 | 4: /* Create a temp kernel stack for use before relocation is on. */ | |
14cf11af PM |
225 | ld r1,PACAEMERGSP(r13) |
226 | subi r1,r1,STACK_FRAME_OVERHEAD | |
227 | ||
c705677e | 228 | b __secondary_start |
14cf11af | 229 | #endif |
14cf11af | 230 | |
e31aa453 PM |
231 | /* |
232 | * Turn the MMU off. | |
233 | * Assumes we're mapped EA == RA if the MMU is on. | |
234 | */ | |
14cf11af PM |
235 | _STATIC(__mmu_off) |
236 | mfmsr r3 | |
237 | andi. r0,r3,MSR_IR|MSR_DR | |
238 | beqlr | |
e31aa453 | 239 | mflr r4 |
14cf11af PM |
240 | andc r3,r3,r0 |
241 | mtspr SPRN_SRR0,r4 | |
242 | mtspr SPRN_SRR1,r3 | |
243 | sync | |
244 | rfid | |
245 | b . /* prevent speculative execution */ | |
246 | ||
247 | ||
248 | /* | |
249 | * Here is our main kernel entry point. We support currently 2 kind of entries | |
250 | * depending on the value of r5. | |
251 | * | |
252 | * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content | |
253 | * in r3...r7 | |
254 | * | |
255 | * r5 == NULL -> kexec style entry. r3 is a physical pointer to the | |
256 | * DT block, r4 is a physical pointer to the kernel itself | |
257 | * | |
258 | */ | |
259 | _GLOBAL(__start_initialization_multiplatform) | |
e31aa453 PM |
260 | /* Make sure we are running in 64 bits mode */ |
261 | bl .enable_64b_mode | |
262 | ||
263 | /* Get TOC pointer (current runtime address) */ | |
264 | bl .relative_toc | |
265 | ||
266 | /* find out where we are now */ | |
267 | bcl 20,31,$+4 | |
268 | 0: mflr r26 /* r26 = runtime addr here */ | |
269 | addis r26,r26,(_stext - 0b)@ha | |
270 | addi r26,r26,(_stext - 0b)@l /* current runtime base addr */ | |
271 | ||
14cf11af PM |
272 | /* |
273 | * Are we booted from a PROM Of-type client-interface ? | |
274 | */ | |
275 | cmpldi cr0,r5,0 | |
939e60f6 SR |
276 | beq 1f |
277 | b .__boot_from_prom /* yes -> prom */ | |
278 | 1: | |
14cf11af PM |
279 | /* Save parameters */ |
280 | mr r31,r3 | |
281 | mr r30,r4 | |
282 | ||
14cf11af | 283 | /* Setup some critical 970 SPRs before switching MMU off */ |
f39b7a55 OJ |
284 | mfspr r0,SPRN_PVR |
285 | srwi r0,r0,16 | |
286 | cmpwi r0,0x39 /* 970 */ | |
287 | beq 1f | |
288 | cmpwi r0,0x3c /* 970FX */ | |
289 | beq 1f | |
290 | cmpwi r0,0x44 /* 970MP */ | |
190a24f5 OJ |
291 | beq 1f |
292 | cmpwi r0,0x45 /* 970GX */ | |
f39b7a55 OJ |
293 | bne 2f |
294 | 1: bl .__cpu_preinit_ppc970 | |
295 | 2: | |
14cf11af | 296 | |
e31aa453 | 297 | /* Switch off MMU if not already off */ |
14cf11af PM |
298 | bl .__mmu_off |
299 | b .__after_prom_start | |
300 | ||
939e60f6 | 301 | _INIT_STATIC(__boot_from_prom) |
28794d34 | 302 | #ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE |
14cf11af PM |
303 | /* Save parameters */ |
304 | mr r31,r3 | |
305 | mr r30,r4 | |
306 | mr r29,r5 | |
307 | mr r28,r6 | |
308 | mr r27,r7 | |
309 | ||
6088857b OH |
310 | /* |
311 | * Align the stack to 16-byte boundary | |
312 | * Depending on the size and layout of the ELF sections in the initial | |
e31aa453 | 313 | * boot binary, the stack pointer may be unaligned on PowerMac |
6088857b | 314 | */ |
c05b4770 LT |
315 | rldicr r1,r1,0,59 |
316 | ||
549e8152 PM |
317 | #ifdef CONFIG_RELOCATABLE |
318 | /* Relocate code for where we are now */ | |
319 | mr r3,r26 | |
320 | bl .relocate | |
321 | #endif | |
322 | ||
14cf11af PM |
323 | /* Restore parameters */ |
324 | mr r3,r31 | |
325 | mr r4,r30 | |
326 | mr r5,r29 | |
327 | mr r6,r28 | |
328 | mr r7,r27 | |
329 | ||
330 | /* Do all of the interaction with OF client interface */ | |
549e8152 | 331 | mr r8,r26 |
14cf11af | 332 | bl .prom_init |
28794d34 BH |
333 | #endif /* #CONFIG_PPC_OF_BOOT_TRAMPOLINE */ |
334 | ||
335 | /* We never return. We also hit that trap if trying to boot | |
336 | * from OF while CONFIG_PPC_OF_BOOT_TRAMPOLINE isn't selected */ | |
14cf11af PM |
337 | trap |
338 | ||
14cf11af | 339 | _STATIC(__after_prom_start) |
549e8152 PM |
340 | #ifdef CONFIG_RELOCATABLE |
341 | /* process relocations for the final address of the kernel */ | |
342 | lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */ | |
343 | sldi r25,r25,32 | |
54622f10 | 344 | #ifdef CONFIG_CRASH_DUMP |
8b8b0cc1 MM |
345 | lwz r7,__run_at_load-_stext(r26) |
346 | cmplwi cr0,r7,1 /* kdump kernel ? - stay where we are */ | |
54622f10 MK |
347 | bne 1f |
348 | add r25,r25,r26 | |
349 | #endif | |
350 | 1: mr r3,r25 | |
549e8152 PM |
351 | bl .relocate |
352 | #endif | |
14cf11af PM |
353 | |
354 | /* | |
e31aa453 | 355 | * We need to run with _stext at physical address PHYSICAL_START. |
14cf11af PM |
356 | * This will leave some code in the first 256B of |
357 | * real memory, which are reserved for software use. | |
14cf11af PM |
358 | * |
359 | * Note: This process overwrites the OF exception vectors. | |
14cf11af | 360 | */ |
549e8152 PM |
361 | li r3,0 /* target addr */ |
362 | mr. r4,r26 /* In some cases the loader may */ | |
e31aa453 | 363 | beq 9f /* have already put us at zero */ |
14cf11af PM |
364 | li r6,0x100 /* Start offset, the first 0x100 */ |
365 | /* bytes were copied earlier. */ | |
366 | ||
54622f10 MK |
367 | #ifdef CONFIG_CRASH_DUMP |
368 | /* | |
369 | * Check if the kernel has to be running as relocatable kernel based on the | |
8b8b0cc1 | 370 | * variable __run_at_load, if it is set the kernel is treated as relocatable |
54622f10 MK |
371 | * kernel, otherwise it will be moved to PHYSICAL_START |
372 | */ | |
8b8b0cc1 MM |
373 | lwz r7,__run_at_load-_stext(r26) |
374 | cmplwi cr0,r7,1 | |
54622f10 MK |
375 | bne 3f |
376 | ||
377 | li r5,__end_interrupts - _stext /* just copy interrupts */ | |
378 | b 5f | |
379 | 3: | |
380 | #endif | |
381 | lis r5,(copy_to_here - _stext)@ha | |
382 | addi r5,r5,(copy_to_here - _stext)@l /* # bytes of memory to copy */ | |
383 | ||
14cf11af PM |
384 | bl .copy_and_flush /* copy the first n bytes */ |
385 | /* this includes the code being */ | |
386 | /* executed here. */ | |
e31aa453 PM |
387 | addis r8,r3,(4f - _stext)@ha /* Jump to the copy of this code */ |
388 | addi r8,r8,(4f - _stext)@l /* that we just made */ | |
389 | mtctr r8 | |
14cf11af PM |
390 | bctr |
391 | ||
54622f10 MK |
392 | p_end: .llong _end - _stext |
393 | ||
e31aa453 PM |
394 | 4: /* Now copy the rest of the kernel up to _end */ |
395 | addis r5,r26,(p_end - _stext)@ha | |
396 | ld r5,(p_end - _stext)@l(r5) /* get _end */ | |
54622f10 | 397 | 5: bl .copy_and_flush /* copy the rest */ |
e31aa453 PM |
398 | |
399 | 9: b .start_here_multiplatform | |
400 | ||
14cf11af PM |
401 | /* |
402 | * Copy routine used to copy the kernel to start at physical address 0 | |
403 | * and flush and invalidate the caches as needed. | |
404 | * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset | |
405 | * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5. | |
406 | * | |
407 | * Note: this routine *only* clobbers r0, r6 and lr | |
408 | */ | |
409 | _GLOBAL(copy_and_flush) | |
410 | addi r5,r5,-8 | |
411 | addi r6,r6,-8 | |
5a2fe38d | 412 | 4: li r0,8 /* Use the smallest common */ |
14cf11af PM |
413 | /* denominator cache line */ |
414 | /* size. This results in */ | |
415 | /* extra cache line flushes */ | |
416 | /* but operation is correct. */ | |
417 | /* Can't get cache line size */ | |
418 | /* from NACA as it is being */ | |
419 | /* moved too. */ | |
420 | ||
421 | mtctr r0 /* put # words/line in ctr */ | |
422 | 3: addi r6,r6,8 /* copy a cache line */ | |
423 | ldx r0,r6,r4 | |
424 | stdx r0,r6,r3 | |
425 | bdnz 3b | |
426 | dcbst r6,r3 /* write it to memory */ | |
427 | sync | |
428 | icbi r6,r3 /* flush the icache line */ | |
429 | cmpld 0,r6,r5 | |
430 | blt 4b | |
431 | sync | |
432 | addi r5,r5,8 | |
433 | addi r6,r6,8 | |
434 | blr | |
435 | ||
436 | .align 8 | |
437 | copy_to_here: | |
438 | ||
439 | #ifdef CONFIG_SMP | |
440 | #ifdef CONFIG_PPC_PMAC | |
441 | /* | |
442 | * On PowerMac, secondary processors starts from the reset vector, which | |
443 | * is temporarily turned into a call to one of the functions below. | |
444 | */ | |
445 | .section ".text"; | |
446 | .align 2 ; | |
447 | ||
35499c01 PM |
448 | .globl __secondary_start_pmac_0 |
449 | __secondary_start_pmac_0: | |
450 | /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */ | |
451 | li r24,0 | |
452 | b 1f | |
453 | li r24,1 | |
454 | b 1f | |
455 | li r24,2 | |
456 | b 1f | |
457 | li r24,3 | |
458 | 1: | |
14cf11af PM |
459 | |
460 | _GLOBAL(pmac_secondary_start) | |
461 | /* turn on 64-bit mode */ | |
462 | bl .enable_64b_mode | |
14cf11af | 463 | |
c478b581 BH |
464 | li r0,0 |
465 | mfspr r3,SPRN_HID4 | |
466 | rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ | |
467 | sync | |
468 | mtspr SPRN_HID4,r3 | |
469 | isync | |
470 | sync | |
471 | slbia | |
472 | ||
e31aa453 PM |
473 | /* get TOC pointer (real address) */ |
474 | bl .relative_toc | |
475 | ||
14cf11af | 476 | /* Copy some CPU settings from CPU 0 */ |
f39b7a55 | 477 | bl .__restore_cpu_ppc970 |
14cf11af PM |
478 | |
479 | /* pSeries do that early though I don't think we really need it */ | |
480 | mfmsr r3 | |
481 | ori r3,r3,MSR_RI | |
482 | mtmsrd r3 /* RI on */ | |
483 | ||
484 | /* Set up a paca value for this processor. */ | |
e31aa453 PM |
485 | LOAD_REG_ADDR(r4,paca) /* Get base vaddr of paca array */ |
486 | mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */ | |
14cf11af | 487 | add r13,r13,r4 /* for this processor. */ |
e31aa453 | 488 | mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */ |
14cf11af PM |
489 | |
490 | /* Create a temp kernel stack for use before relocation is on. */ | |
491 | ld r1,PACAEMERGSP(r13) | |
492 | subi r1,r1,STACK_FRAME_OVERHEAD | |
493 | ||
c705677e | 494 | b __secondary_start |
14cf11af PM |
495 | |
496 | #endif /* CONFIG_PPC_PMAC */ | |
497 | ||
498 | /* | |
499 | * This function is called after the master CPU has released the | |
500 | * secondary processors. The execution environment is relocation off. | |
501 | * The paca for this processor has the following fields initialized at | |
502 | * this point: | |
503 | * 1. Processor number | |
504 | * 2. Segment table pointer (virtual address) | |
505 | * On entry the following are set: | |
506 | * r1 = stack pointer. vaddr for iSeries, raddr (temp stack) for pSeries | |
507 | * r24 = cpu# (in Linux terms) | |
508 | * r13 = paca virtual address | |
509 | * SPRG3 = paca virtual address | |
510 | */ | |
fc68e869 | 511 | .globl __secondary_start |
c705677e | 512 | __secondary_start: |
799d6046 PM |
513 | /* Set thread priority to MEDIUM */ |
514 | HMT_MEDIUM | |
14cf11af | 515 | |
799d6046 PM |
516 | /* Do early setup for that CPU (stab, slb, hash table pointer) */ |
517 | bl .early_setup_secondary | |
14cf11af PM |
518 | |
519 | /* Initialize the kernel stack. Just a repeat for iSeries. */ | |
e58c3495 | 520 | LOAD_REG_ADDR(r3, current_set) |
14cf11af PM |
521 | sldi r28,r24,3 /* get current_set[cpu#] */ |
522 | ldx r1,r3,r28 | |
523 | addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD | |
524 | std r1,PACAKSAVE(r13) | |
525 | ||
799d6046 | 526 | /* Clear backchain so we get nice backtraces */ |
14cf11af PM |
527 | li r7,0 |
528 | mtlr r7 | |
529 | ||
530 | /* enable MMU and jump to start_secondary */ | |
e58c3495 DG |
531 | LOAD_REG_ADDR(r3, .start_secondary_prolog) |
532 | LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) | |
d04c56f7 | 533 | #ifdef CONFIG_PPC_ISERIES |
3f639ee8 | 534 | BEGIN_FW_FTR_SECTION |
14cf11af | 535 | ori r4,r4,MSR_EE |
ff3da2e0 BH |
536 | li r8,1 |
537 | stb r8,PACAHARDIRQEN(r13) | |
3f639ee8 | 538 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) |
14cf11af | 539 | #endif |
d04c56f7 | 540 | BEGIN_FW_FTR_SECTION |
d04c56f7 PM |
541 | stb r7,PACAHARDIRQEN(r13) |
542 | END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) | |
ff3da2e0 | 543 | stb r7,PACASOFTIRQEN(r13) |
d04c56f7 | 544 | |
b5bbeb23 PM |
545 | mtspr SPRN_SRR0,r3 |
546 | mtspr SPRN_SRR1,r4 | |
14cf11af PM |
547 | rfid |
548 | b . /* prevent speculative execution */ | |
549 | ||
550 | /* | |
551 | * Running with relocation on at this point. All we want to do is | |
e31aa453 PM |
552 | * zero the stack back-chain pointer and get the TOC virtual address |
553 | * before going into C code. | |
14cf11af PM |
554 | */ |
555 | _GLOBAL(start_secondary_prolog) | |
e31aa453 | 556 | ld r2,PACATOC(r13) |
14cf11af PM |
557 | li r3,0 |
558 | std r3,0(r1) /* Zero the stack frame pointer */ | |
559 | bl .start_secondary | |
799d6046 | 560 | b . |
14cf11af PM |
561 | #endif |
562 | ||
563 | /* | |
564 | * This subroutine clobbers r11 and r12 | |
565 | */ | |
566 | _GLOBAL(enable_64b_mode) | |
567 | mfmsr r11 /* grab the current MSR */ | |
e31aa453 PM |
568 | li r12,(MSR_SF | MSR_ISF)@highest |
569 | sldi r12,r12,48 | |
14cf11af PM |
570 | or r11,r11,r12 |
571 | mtmsrd r11 | |
572 | isync | |
573 | blr | |
574 | ||
e31aa453 PM |
575 | /* |
576 | * This puts the TOC pointer into r2, offset by 0x8000 (as expected | |
577 | * by the toolchain). It computes the correct value for wherever we | |
578 | * are running at the moment, using position-independent code. | |
579 | */ | |
580 | _GLOBAL(relative_toc) | |
581 | mflr r0 | |
582 | bcl 20,31,$+4 | |
583 | 0: mflr r9 | |
584 | ld r2,(p_toc - 0b)(r9) | |
585 | add r2,r2,r9 | |
586 | mtlr r0 | |
587 | blr | |
588 | ||
589 | p_toc: .llong __toc_start + 0x8000 - 0b | |
590 | ||
14cf11af PM |
591 | /* |
592 | * This is where the main kernel code starts. | |
593 | */ | |
939e60f6 | 594 | _INIT_STATIC(start_here_multiplatform) |
e31aa453 PM |
595 | /* set up the TOC (real address) */ |
596 | bl .relative_toc | |
14cf11af PM |
597 | |
598 | /* Clear out the BSS. It may have been done in prom_init, | |
599 | * already but that's irrelevant since prom_init will soon | |
600 | * be detached from the kernel completely. Besides, we need | |
601 | * to clear it now for kexec-style entry. | |
602 | */ | |
e31aa453 PM |
603 | LOAD_REG_ADDR(r11,__bss_stop) |
604 | LOAD_REG_ADDR(r8,__bss_start) | |
14cf11af PM |
605 | sub r11,r11,r8 /* bss size */ |
606 | addi r11,r11,7 /* round up to an even double word */ | |
e31aa453 | 607 | srdi. r11,r11,3 /* shift right by 3 */ |
14cf11af PM |
608 | beq 4f |
609 | addi r8,r8,-8 | |
610 | li r0,0 | |
611 | mtctr r11 /* zero this many doublewords */ | |
612 | 3: stdu r0,8(r8) | |
613 | bdnz 3b | |
614 | 4: | |
615 | ||
616 | mfmsr r6 | |
617 | ori r6,r6,MSR_RI | |
618 | mtmsrd r6 /* RI on */ | |
619 | ||
549e8152 PM |
620 | #ifdef CONFIG_RELOCATABLE |
621 | /* Save the physical address we're running at in kernstart_addr */ | |
622 | LOAD_REG_ADDR(r4, kernstart_addr) | |
623 | clrldi r0,r25,2 | |
624 | std r0,0(r4) | |
625 | #endif | |
626 | ||
e31aa453 | 627 | /* The following gets the stack set up with the regs */ |
14cf11af PM |
628 | /* pointing to the real addr of the kernel stack. This is */ |
629 | /* all done to support the C function call below which sets */ | |
630 | /* up the htab. This is done because we have relocated the */ | |
631 | /* kernel but are still running in real mode. */ | |
632 | ||
e31aa453 | 633 | LOAD_REG_ADDR(r3,init_thread_union) |
14cf11af | 634 | |
e31aa453 | 635 | /* set up a stack pointer */ |
14cf11af PM |
636 | addi r1,r3,THREAD_SIZE |
637 | li r0,0 | |
638 | stdu r0,-STACK_FRAME_OVERHEAD(r1) | |
639 | ||
14cf11af PM |
640 | /* Do very early kernel initializations, including initial hash table, |
641 | * stab and slb setup before we turn on relocation. */ | |
642 | ||
643 | /* Restore parameters passed from prom_init/kexec */ | |
644 | mr r3,r31 | |
e31aa453 | 645 | bl .early_setup /* also sets r13 and SPRG3 */ |
14cf11af | 646 | |
e31aa453 PM |
647 | LOAD_REG_ADDR(r3, .start_here_common) |
648 | ld r4,PACAKMSR(r13) | |
b5bbeb23 PM |
649 | mtspr SPRN_SRR0,r3 |
650 | mtspr SPRN_SRR1,r4 | |
14cf11af PM |
651 | rfid |
652 | b . /* prevent speculative execution */ | |
14cf11af PM |
653 | |
654 | /* This is where all platforms converge execution */ | |
fc68e869 | 655 | _INIT_GLOBAL(start_here_common) |
14cf11af | 656 | /* relocation is on at this point */ |
e31aa453 | 657 | std r1,PACAKSAVE(r13) |
14cf11af | 658 | |
e31aa453 | 659 | /* Load the TOC (virtual address) */ |
14cf11af | 660 | ld r2,PACATOC(r13) |
14cf11af PM |
661 | |
662 | bl .setup_system | |
663 | ||
664 | /* Load up the kernel context */ | |
665 | 5: | |
14cf11af | 666 | li r5,0 |
d04c56f7 PM |
667 | stb r5,PACASOFTIRQEN(r13) /* Soft Disabled */ |
668 | #ifdef CONFIG_PPC_ISERIES | |
669 | BEGIN_FW_FTR_SECTION | |
14cf11af | 670 | mfmsr r5 |
ff3da2e0 | 671 | ori r5,r5,MSR_EE /* Hard Enabled on iSeries*/ |
14cf11af | 672 | mtmsrd r5 |
ff3da2e0 | 673 | li r5,1 |
3f639ee8 | 674 | END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) |
14cf11af | 675 | #endif |
ff3da2e0 | 676 | stb r5,PACAHARDIRQEN(r13) /* Hard Disabled on others */ |
14cf11af | 677 | |
ff3da2e0 | 678 | bl .start_kernel |
14cf11af | 679 | |
f1870f77 AB |
680 | /* Not reached */ |
681 | BUG_OPCODE | |
14cf11af | 682 | |
14cf11af PM |
683 | /* |
684 | * We put a few things here that have to be page-aligned. | |
685 | * This stuff goes at the beginning of the bss, which is page-aligned. | |
686 | */ | |
687 | .section ".bss" | |
688 | ||
689 | .align PAGE_SHIFT | |
690 | ||
691 | .globl empty_zero_page | |
692 | empty_zero_page: | |
693 | .space PAGE_SIZE | |
694 | ||
695 | .globl swapper_pg_dir | |
696 | swapper_pg_dir: | |
ee7a76da | 697 | .space PGD_TABLE_SIZE |