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powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly
[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / kernel / head_fsl_booke.S
1 /*
2 * Kernel execution entry point code.
3 *
4 * Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org>
5 * Initial PowerPC version.
6 * Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu>
7 * Rewritten for PReP
8 * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au>
9 * Low-level exception handers, MMU support, and rewrite.
10 * Copyright (c) 1997 Dan Malek <dmalek@jlc.net>
11 * PowerPC 8xx modifications.
12 * Copyright (c) 1998-1999 TiVo, Inc.
13 * PowerPC 403GCX modifications.
14 * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
15 * PowerPC 403GCX/405GP modifications.
16 * Copyright 2000 MontaVista Software Inc.
17 * PPC405 modifications
18 * PowerPC 403GCX/405GP modifications.
19 * Author: MontaVista Software, Inc.
20 * frank_rowand@mvista.com or source@mvista.com
21 * debbie_chu@mvista.com
22 * Copyright 2002-2004 MontaVista Software, Inc.
23 * PowerPC 44x support, Matt Porter <mporter@kernel.crashing.org>
24 * Copyright 2004 Freescale Semiconductor, Inc
25 * PowerPC e500 modifications, Kumar Gala <galak@kernel.crashing.org>
26 *
27 * This program is free software; you can redistribute it and/or modify it
28 * under the terms of the GNU General Public License as published by the
29 * Free Software Foundation; either version 2 of the License, or (at your
30 * option) any later version.
31 */
32
33 #include <linux/init.h>
34 #include <linux/threads.h>
35 #include <asm/processor.h>
36 #include <asm/page.h>
37 #include <asm/mmu.h>
38 #include <asm/pgtable.h>
39 #include <asm/cputable.h>
40 #include <asm/thread_info.h>
41 #include <asm/ppc_asm.h>
42 #include <asm/asm-offsets.h>
43 #include <asm/cache.h>
44 #include <asm/ptrace.h>
45 #include "head_booke.h"
46
47 /* As with the other PowerPC ports, it is expected that when code
48 * execution begins here, the following registers contain valid, yet
49 * optional, information:
50 *
51 * r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.)
52 * r4 - Starting address of the init RAM disk
53 * r5 - Ending address of the init RAM disk
54 * r6 - Start of kernel command line string (e.g. "mem=128")
55 * r7 - End of kernel command line string
56 *
57 */
58 __HEAD
59 _ENTRY(_stext);
60 _ENTRY(_start);
61 /*
62 * Reserve a word at a fixed location to store the address
63 * of abatron_pteptrs
64 */
65 nop
66
67 /* Translate device tree address to physical, save in r30/r31 */
68 mfmsr r16
69 mfspr r17,SPRN_PID
70 rlwinm r17,r17,16,0x3fff0000 /* turn PID into MAS6[SPID] */
71 rlwimi r17,r16,28,0x00000001 /* turn MSR[DS] into MAS6[SAS] */
72 mtspr SPRN_MAS6,r17
73
74 tlbsx 0,r3 /* must succeed */
75
76 mfspr r16,SPRN_MAS1
77 mfspr r20,SPRN_MAS3
78 rlwinm r17,r16,25,0x1f /* r17 = log2(page size) */
79 li r18,1024
80 slw r18,r18,r17 /* r18 = page size */
81 addi r18,r18,-1
82 and r19,r3,r18 /* r19 = page offset */
83 andc r31,r20,r18 /* r31 = page base */
84 or r31,r31,r19 /* r31 = devtree phys addr */
85 mfspr r30,SPRN_MAS7
86
87 li r25,0 /* phys kernel start (low) */
88 li r24,0 /* CPU number */
89 li r23,0 /* phys kernel start (high) */
90
91 /* We try to not make any assumptions about how the boot loader
92 * setup or used the TLBs. We invalidate all mappings from the
93 * boot loader and load a single entry in TLB1[0] to map the
94 * first 64M of kernel memory. Any boot info passed from the
95 * bootloader needs to live in this first 64M.
96 *
97 * Requirement on bootloader:
98 * - The page we're executing in needs to reside in TLB1 and
99 * have IPROT=1. If not an invalidate broadcast could
100 * evict the entry we're currently executing in.
101 *
102 * r3 = Index of TLB1 were executing in
103 * r4 = Current MSR[IS]
104 * r5 = Index of TLB1 temp mapping
105 *
106 * Later in mapin_ram we will correctly map lowmem, and resize TLB1[0]
107 * if needed
108 */
109
110 _ENTRY(__early_start)
111
112 #define ENTRY_MAPPING_BOOT_SETUP
113 #include "fsl_booke_entry_mapping.S"
114 #undef ENTRY_MAPPING_BOOT_SETUP
115
116 /* Establish the interrupt vector offsets */
117 SET_IVOR(0, CriticalInput);
118 SET_IVOR(1, MachineCheck);
119 SET_IVOR(2, DataStorage);
120 SET_IVOR(3, InstructionStorage);
121 SET_IVOR(4, ExternalInput);
122 SET_IVOR(5, Alignment);
123 SET_IVOR(6, Program);
124 SET_IVOR(7, FloatingPointUnavailable);
125 SET_IVOR(8, SystemCall);
126 SET_IVOR(9, AuxillaryProcessorUnavailable);
127 SET_IVOR(10, Decrementer);
128 SET_IVOR(11, FixedIntervalTimer);
129 SET_IVOR(12, WatchdogTimer);
130 SET_IVOR(13, DataTLBError);
131 SET_IVOR(14, InstructionTLBError);
132 SET_IVOR(15, DebugCrit);
133
134 /* Establish the interrupt vector base */
135 lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */
136 mtspr SPRN_IVPR,r4
137
138 /* Setup the defaults for TLB entries */
139 li r2,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l
140 #ifdef CONFIG_E200
141 oris r2,r2,MAS4_TLBSELD(1)@h
142 #endif
143 mtspr SPRN_MAS4, r2
144
145 #if 0
146 /* Enable DOZE */
147 mfspr r2,SPRN_HID0
148 oris r2,r2,HID0_DOZE@h
149 mtspr SPRN_HID0, r2
150 #endif
151
152 #if !defined(CONFIG_BDI_SWITCH)
153 /*
154 * The Abatron BDI JTAG debugger does not tolerate others
155 * mucking with the debug registers.
156 */
157 lis r2,DBCR0_IDM@h
158 mtspr SPRN_DBCR0,r2
159 isync
160 /* clear any residual debug events */
161 li r2,-1
162 mtspr SPRN_DBSR,r2
163 #endif
164
165 #ifdef CONFIG_SMP
166 /* Check to see if we're the second processor, and jump
167 * to the secondary_start code if so
168 */
169 lis r24, boot_cpuid@h
170 ori r24, r24, boot_cpuid@l
171 lwz r24, 0(r24)
172 cmpwi r24, -1
173 mfspr r24,SPRN_PIR
174 bne __secondary_start
175 #endif
176
177 /*
178 * This is where the main kernel code starts.
179 */
180
181 /* ptr to current */
182 lis r2,init_task@h
183 ori r2,r2,init_task@l
184
185 /* ptr to current thread */
186 addi r4,r2,THREAD /* init task's THREAD */
187 mtspr SPRN_SPRG_THREAD,r4
188
189 /* stack */
190 lis r1,init_thread_union@h
191 ori r1,r1,init_thread_union@l
192 li r0,0
193 stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
194
195 CURRENT_THREAD_INFO(r22, r1)
196 stw r24, TI_CPU(r22)
197
198 bl early_init
199
200 #ifdef CONFIG_DYNAMIC_MEMSTART
201 lis r3,kernstart_addr@ha
202 la r3,kernstart_addr@l(r3)
203 #ifdef CONFIG_PHYS_64BIT
204 stw r23,0(r3)
205 stw r25,4(r3)
206 #else
207 stw r25,0(r3)
208 #endif
209 #endif
210
211 /*
212 * Decide what sort of machine this is and initialize the MMU.
213 */
214 mr r3,r30
215 mr r4,r31
216 bl machine_init
217 bl MMU_init
218
219 /* Setup PTE pointers for the Abatron bdiGDB */
220 lis r6, swapper_pg_dir@h
221 ori r6, r6, swapper_pg_dir@l
222 lis r5, abatron_pteptrs@h
223 ori r5, r5, abatron_pteptrs@l
224 lis r4, KERNELBASE@h
225 ori r4, r4, KERNELBASE@l
226 stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */
227 stw r6, 0(r5)
228
229 /* Let's move on */
230 lis r4,start_kernel@h
231 ori r4,r4,start_kernel@l
232 lis r3,MSR_KERNEL@h
233 ori r3,r3,MSR_KERNEL@l
234 mtspr SPRN_SRR0,r4
235 mtspr SPRN_SRR1,r3
236 rfi /* change context and jump to start_kernel */
237
238 /* Macros to hide the PTE size differences
239 *
240 * FIND_PTE -- walks the page tables given EA & pgdir pointer
241 * r10 -- EA of fault
242 * r11 -- PGDIR pointer
243 * r12 -- free
244 * label 2: is the bailout case
245 *
246 * if we find the pte (fall through):
247 * r11 is low pte word
248 * r12 is pointer to the pte
249 * r10 is the pshift from the PGD, if we're a hugepage
250 */
251 #ifdef CONFIG_PTE_64BIT
252 #ifdef CONFIG_HUGETLB_PAGE
253 #define FIND_PTE \
254 rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
255 lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
256 rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \
257 blt 1000f; /* Normal non-huge page */ \
258 beq 2f; /* Bail if no table */ \
259 oris r11, r11, PD_HUGE@h; /* Put back address bit */ \
260 andi. r10, r11, HUGEPD_SHIFT_MASK@l; /* extract size field */ \
261 xor r12, r10, r11; /* drop size bits from pointer */ \
262 b 1001f; \
263 1000: rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
264 li r10, 0; /* clear r10 */ \
265 1001: lwz r11, 4(r12); /* Get pte entry */
266 #else
267 #define FIND_PTE \
268 rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
269 lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
270 rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \
271 beq 2f; /* Bail if no table */ \
272 rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
273 lwz r11, 4(r12); /* Get pte entry */
274 #endif /* HUGEPAGE */
275 #else /* !PTE_64BIT */
276 #define FIND_PTE \
277 rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \
278 lwz r11, 0(r11); /* Get L1 entry */ \
279 rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \
280 beq 2f; /* Bail if no table */ \
281 rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \
282 lwz r11, 0(r12); /* Get Linux PTE */
283 #endif
284
285 /*
286 * Interrupt vector entry code
287 *
288 * The Book E MMUs are always on so we don't need to handle
289 * interrupts in real mode as with previous PPC processors. In
290 * this case we handle interrupts in the kernel virtual address
291 * space.
292 *
293 * Interrupt vectors are dynamically placed relative to the
294 * interrupt prefix as determined by the address of interrupt_base.
295 * The interrupt vectors offsets are programmed using the labels
296 * for each interrupt vector entry.
297 *
298 * Interrupt vectors must be aligned on a 16 byte boundary.
299 * We align on a 32 byte cache line boundary for good measure.
300 */
301
302 interrupt_base:
303 /* Critical Input Interrupt */
304 CRITICAL_EXCEPTION(0x0100, CRITICAL, CriticalInput, unknown_exception)
305
306 /* Machine Check Interrupt */
307 #ifdef CONFIG_E200
308 /* no RFMCI, MCSRRs on E200 */
309 CRITICAL_EXCEPTION(0x0200, MACHINE_CHECK, MachineCheck, \
310 machine_check_exception)
311 #else
312 MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
313 #endif
314
315 /* Data Storage Interrupt */
316 START_EXCEPTION(DataStorage)
317 NORMAL_EXCEPTION_PROLOG(DATA_STORAGE)
318 mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */
319 stw r5,_ESR(r11)
320 mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */
321 andis. r10,r5,(ESR_ILK|ESR_DLK)@h
322 bne 1f
323 EXC_XFER_LITE(0x0300, handle_page_fault)
324 1:
325 addi r3,r1,STACK_FRAME_OVERHEAD
326 EXC_XFER_EE_LITE(0x0300, CacheLockingException)
327
328 /* Instruction Storage Interrupt */
329 INSTRUCTION_STORAGE_EXCEPTION
330
331 /* External Input Interrupt */
332 EXCEPTION(0x0500, EXTERNAL, ExternalInput, do_IRQ, EXC_XFER_LITE)
333
334 /* Alignment Interrupt */
335 ALIGNMENT_EXCEPTION
336
337 /* Program Interrupt */
338 PROGRAM_EXCEPTION
339
340 /* Floating Point Unavailable Interrupt */
341 #ifdef CONFIG_PPC_FPU
342 FP_UNAVAILABLE_EXCEPTION
343 #else
344 #ifdef CONFIG_E200
345 /* E200 treats 'normal' floating point instructions as FP Unavail exception */
346 EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, \
347 program_check_exception, EXC_XFER_EE)
348 #else
349 EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, \
350 unknown_exception, EXC_XFER_EE)
351 #endif
352 #endif
353
354 /* System Call Interrupt */
355 START_EXCEPTION(SystemCall)
356 NORMAL_EXCEPTION_PROLOG(SYSCALL)
357 EXC_XFER_EE_LITE(0x0c00, DoSyscall)
358
359 /* Auxiliary Processor Unavailable Interrupt */
360 EXCEPTION(0x2900, AP_UNAVAIL, AuxillaryProcessorUnavailable, \
361 unknown_exception, EXC_XFER_EE)
362
363 /* Decrementer Interrupt */
364 DECREMENTER_EXCEPTION
365
366 /* Fixed Internal Timer Interrupt */
367 /* TODO: Add FIT support */
368 EXCEPTION(0x3100, FIT, FixedIntervalTimer, \
369 unknown_exception, EXC_XFER_EE)
370
371 /* Watchdog Timer Interrupt */
372 #ifdef CONFIG_BOOKE_WDT
373 CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, WatchdogException)
374 #else
375 CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, unknown_exception)
376 #endif
377
378 /* Data TLB Error Interrupt */
379 START_EXCEPTION(DataTLBError)
380 mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */
381 mfspr r10, SPRN_SPRG_THREAD
382 stw r11, THREAD_NORMSAVE(0)(r10)
383 #ifdef CONFIG_KVM_BOOKE_HV
384 BEGIN_FTR_SECTION
385 mfspr r11, SPRN_SRR1
386 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
387 #endif
388 stw r12, THREAD_NORMSAVE(1)(r10)
389 stw r13, THREAD_NORMSAVE(2)(r10)
390 mfcr r13
391 stw r13, THREAD_NORMSAVE(3)(r10)
392 DO_KVM BOOKE_INTERRUPT_DTLB_MISS SPRN_SRR1
393 mfspr r10, SPRN_DEAR /* Get faulting address */
394
395 /* If we are faulting a kernel address, we have to use the
396 * kernel page tables.
397 */
398 lis r11, PAGE_OFFSET@h
399 cmplw 5, r10, r11
400 blt 5, 3f
401 lis r11, swapper_pg_dir@h
402 ori r11, r11, swapper_pg_dir@l
403
404 mfspr r12,SPRN_MAS1 /* Set TID to 0 */
405 rlwinm r12,r12,0,16,1
406 mtspr SPRN_MAS1,r12
407
408 b 4f
409
410 /* Get the PGD for the current thread */
411 3:
412 mfspr r11,SPRN_SPRG_THREAD
413 lwz r11,PGDIR(r11)
414
415 4:
416 /* Mask of required permission bits. Note that while we
417 * do copy ESR:ST to _PAGE_RW position as trying to write
418 * to an RO page is pretty common, we don't do it with
419 * _PAGE_DIRTY. We could do it, but it's a fairly rare
420 * event so I'd rather take the overhead when it happens
421 * rather than adding an instruction here. We should measure
422 * whether the whole thing is worth it in the first place
423 * as we could avoid loading SPRN_ESR completely in the first
424 * place...
425 *
426 * TODO: Is it worth doing that mfspr & rlwimi in the first
427 * place or can we save a couple of instructions here ?
428 */
429 mfspr r12,SPRN_ESR
430 #ifdef CONFIG_PTE_64BIT
431 li r13,_PAGE_PRESENT
432 oris r13,r13,_PAGE_ACCESSED@h
433 #else
434 li r13,_PAGE_PRESENT|_PAGE_ACCESSED
435 #endif
436 rlwimi r13,r12,11,29,29
437
438 FIND_PTE
439 andc. r13,r13,r11 /* Check permission */
440
441 #ifdef CONFIG_PTE_64BIT
442 #ifdef CONFIG_SMP
443 subf r13,r11,r12 /* create false data dep */
444 lwzx r13,r11,r13 /* Get upper pte bits */
445 #else
446 lwz r13,0(r12) /* Get upper pte bits */
447 #endif
448 #endif
449
450 bne 2f /* Bail if permission/valid mismach */
451
452 /* Jump to common tlb load */
453 b finish_tlb_load
454 2:
455 /* The bailout. Restore registers to pre-exception conditions
456 * and call the heavyweights to help us out.
457 */
458 mfspr r10, SPRN_SPRG_THREAD
459 lwz r11, THREAD_NORMSAVE(3)(r10)
460 mtcr r11
461 lwz r13, THREAD_NORMSAVE(2)(r10)
462 lwz r12, THREAD_NORMSAVE(1)(r10)
463 lwz r11, THREAD_NORMSAVE(0)(r10)
464 mfspr r10, SPRN_SPRG_RSCRATCH0
465 b DataStorage
466
467 /* Instruction TLB Error Interrupt */
468 /*
469 * Nearly the same as above, except we get our
470 * information from different registers and bailout
471 * to a different point.
472 */
473 START_EXCEPTION(InstructionTLBError)
474 mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */
475 mfspr r10, SPRN_SPRG_THREAD
476 stw r11, THREAD_NORMSAVE(0)(r10)
477 #ifdef CONFIG_KVM_BOOKE_HV
478 BEGIN_FTR_SECTION
479 mfspr r11, SPRN_SRR1
480 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
481 #endif
482 stw r12, THREAD_NORMSAVE(1)(r10)
483 stw r13, THREAD_NORMSAVE(2)(r10)
484 mfcr r13
485 stw r13, THREAD_NORMSAVE(3)(r10)
486 DO_KVM BOOKE_INTERRUPT_ITLB_MISS SPRN_SRR1
487 mfspr r10, SPRN_SRR0 /* Get faulting address */
488
489 /* If we are faulting a kernel address, we have to use the
490 * kernel page tables.
491 */
492 lis r11, PAGE_OFFSET@h
493 cmplw 5, r10, r11
494 blt 5, 3f
495 lis r11, swapper_pg_dir@h
496 ori r11, r11, swapper_pg_dir@l
497
498 mfspr r12,SPRN_MAS1 /* Set TID to 0 */
499 rlwinm r12,r12,0,16,1
500 mtspr SPRN_MAS1,r12
501
502 /* Make up the required permissions for kernel code */
503 #ifdef CONFIG_PTE_64BIT
504 li r13,_PAGE_PRESENT | _PAGE_BAP_SX
505 oris r13,r13,_PAGE_ACCESSED@h
506 #else
507 li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
508 #endif
509 b 4f
510
511 /* Get the PGD for the current thread */
512 3:
513 mfspr r11,SPRN_SPRG_THREAD
514 lwz r11,PGDIR(r11)
515
516 /* Make up the required permissions for user code */
517 #ifdef CONFIG_PTE_64BIT
518 li r13,_PAGE_PRESENT | _PAGE_BAP_UX
519 oris r13,r13,_PAGE_ACCESSED@h
520 #else
521 li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
522 #endif
523
524 4:
525 FIND_PTE
526 andc. r13,r13,r11 /* Check permission */
527
528 #ifdef CONFIG_PTE_64BIT
529 #ifdef CONFIG_SMP
530 subf r13,r11,r12 /* create false data dep */
531 lwzx r13,r11,r13 /* Get upper pte bits */
532 #else
533 lwz r13,0(r12) /* Get upper pte bits */
534 #endif
535 #endif
536
537 bne 2f /* Bail if permission mismach */
538
539 /* Jump to common TLB load point */
540 b finish_tlb_load
541
542 2:
543 /* The bailout. Restore registers to pre-exception conditions
544 * and call the heavyweights to help us out.
545 */
546 mfspr r10, SPRN_SPRG_THREAD
547 lwz r11, THREAD_NORMSAVE(3)(r10)
548 mtcr r11
549 lwz r13, THREAD_NORMSAVE(2)(r10)
550 lwz r12, THREAD_NORMSAVE(1)(r10)
551 lwz r11, THREAD_NORMSAVE(0)(r10)
552 mfspr r10, SPRN_SPRG_RSCRATCH0
553 b InstructionStorage
554
555 #ifdef CONFIG_SPE
556 /* SPE Unavailable */
557 START_EXCEPTION(SPEUnavailable)
558 NORMAL_EXCEPTION_PROLOG(SPE_UNAVAIL)
559 bne load_up_spe
560 addi r3,r1,STACK_FRAME_OVERHEAD
561 EXC_XFER_EE_LITE(0x2010, KernelSPE)
562 #else
563 EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, \
564 unknown_exception, EXC_XFER_EE)
565 #endif /* CONFIG_SPE */
566
567 /* SPE Floating Point Data */
568 #ifdef CONFIG_SPE
569 EXCEPTION(0x2030, SPE_FP_DATA, SPEFloatingPointData, \
570 SPEFloatingPointException, EXC_XFER_EE);
571
572 /* SPE Floating Point Round */
573 EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \
574 SPEFloatingPointRoundException, EXC_XFER_EE)
575 #else
576 EXCEPTION(0x2040, SPE_FP_DATA, SPEFloatingPointData, \
577 unknown_exception, EXC_XFER_EE)
578 EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \
579 unknown_exception, EXC_XFER_EE)
580 #endif /* CONFIG_SPE */
581
582 /* Performance Monitor */
583 EXCEPTION(0x2060, PERFORMANCE_MONITOR, PerformanceMonitor, \
584 performance_monitor_exception, EXC_XFER_STD)
585
586 EXCEPTION(0x2070, DOORBELL, Doorbell, doorbell_exception, EXC_XFER_STD)
587
588 CRITICAL_EXCEPTION(0x2080, DOORBELL_CRITICAL, \
589 CriticalDoorbell, unknown_exception)
590
591 /* Debug Interrupt */
592 DEBUG_DEBUG_EXCEPTION
593 DEBUG_CRIT_EXCEPTION
594
595 GUEST_DOORBELL_EXCEPTION
596
597 CRITICAL_EXCEPTION(0, GUEST_DBELL_CRIT, CriticalGuestDoorbell, \
598 unknown_exception)
599
600 /* Hypercall */
601 EXCEPTION(0, HV_SYSCALL, Hypercall, unknown_exception, EXC_XFER_EE)
602
603 /* Embedded Hypervisor Privilege */
604 EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception, EXC_XFER_EE)
605
606 /*
607 * Local functions
608 */
609
610 /*
611 * Both the instruction and data TLB miss get to this
612 * point to load the TLB.
613 * r10 - tsize encoding (if HUGETLB_PAGE) or available to use
614 * r11 - TLB (info from Linux PTE)
615 * r12 - available to use
616 * r13 - upper bits of PTE (if PTE_64BIT) or available to use
617 * CR5 - results of addr >= PAGE_OFFSET
618 * MAS0, MAS1 - loaded with proper value when we get here
619 * MAS2, MAS3 - will need additional info from Linux PTE
620 * Upon exit, we reload everything and RFI.
621 */
622 finish_tlb_load:
623 #ifdef CONFIG_HUGETLB_PAGE
624 cmpwi 6, r10, 0 /* check for huge page */
625 beq 6, finish_tlb_load_cont /* !huge */
626
627 /* Alas, we need more scratch registers for hugepages */
628 mfspr r12, SPRN_SPRG_THREAD
629 stw r14, THREAD_NORMSAVE(4)(r12)
630 stw r15, THREAD_NORMSAVE(5)(r12)
631 stw r16, THREAD_NORMSAVE(6)(r12)
632 stw r17, THREAD_NORMSAVE(7)(r12)
633
634 /* Get the next_tlbcam_idx percpu var */
635 #ifdef CONFIG_SMP
636 lwz r12, THREAD_INFO-THREAD(r12)
637 lwz r15, TI_CPU(r12)
638 lis r14, __per_cpu_offset@h
639 ori r14, r14, __per_cpu_offset@l
640 rlwinm r15, r15, 2, 0, 29
641 lwzx r16, r14, r15
642 #else
643 li r16, 0
644 #endif
645 lis r17, next_tlbcam_idx@h
646 ori r17, r17, next_tlbcam_idx@l
647 add r17, r17, r16 /* r17 = *next_tlbcam_idx */
648 lwz r15, 0(r17) /* r15 = next_tlbcam_idx */
649
650 lis r14, MAS0_TLBSEL(1)@h /* select TLB1 (TLBCAM) */
651 rlwimi r14, r15, 16, 4, 15 /* next_tlbcam_idx entry */
652 mtspr SPRN_MAS0, r14
653
654 /* Extract TLB1CFG(NENTRY) */
655 mfspr r16, SPRN_TLB1CFG
656 andi. r16, r16, 0xfff
657
658 /* Update next_tlbcam_idx, wrapping when necessary */
659 addi r15, r15, 1
660 cmpw r15, r16
661 blt 100f
662 lis r14, tlbcam_index@h
663 ori r14, r14, tlbcam_index@l
664 lwz r15, 0(r14)
665 100: stw r15, 0(r17)
666
667 /*
668 * Calc MAS1_TSIZE from r10 (which has pshift encoded)
669 * tlb_enc = (pshift - 10).
670 */
671 subi r15, r10, 10
672 mfspr r16, SPRN_MAS1
673 rlwimi r16, r15, 7, 20, 24
674 mtspr SPRN_MAS1, r16
675
676 /* copy the pshift for use later */
677 mr r14, r10
678
679 /* fall through */
680
681 #endif /* CONFIG_HUGETLB_PAGE */
682
683 /*
684 * We set execute, because we don't have the granularity to
685 * properly set this at the page level (Linux problem).
686 * Many of these bits are software only. Bits we don't set
687 * here we (properly should) assume have the appropriate value.
688 */
689 finish_tlb_load_cont:
690 #ifdef CONFIG_PTE_64BIT
691 rlwinm r12, r11, 32-2, 26, 31 /* Move in perm bits */
692 andi. r10, r11, _PAGE_DIRTY
693 bne 1f
694 li r10, MAS3_SW | MAS3_UW
695 andc r12, r12, r10
696 1: rlwimi r12, r13, 20, 0, 11 /* grab RPN[32:43] */
697 rlwimi r12, r11, 20, 12, 19 /* grab RPN[44:51] */
698 2: mtspr SPRN_MAS3, r12
699 BEGIN_MMU_FTR_SECTION
700 srwi r10, r13, 12 /* grab RPN[12:31] */
701 mtspr SPRN_MAS7, r10
702 END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
703 #else
704 li r10, (_PAGE_EXEC | _PAGE_PRESENT)
705 mr r13, r11
706 rlwimi r10, r11, 31, 29, 29 /* extract _PAGE_DIRTY into SW */
707 and r12, r11, r10
708 andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */
709 slwi r10, r12, 1
710 or r10, r10, r12
711 iseleq r12, r12, r10
712 rlwimi r13, r12, 0, 20, 31 /* Get RPN from PTE, merge w/ perms */
713 mtspr SPRN_MAS3, r13
714 #endif
715
716 mfspr r12, SPRN_MAS2
717 #ifdef CONFIG_PTE_64BIT
718 rlwimi r12, r11, 32-19, 27, 31 /* extract WIMGE from pte */
719 #else
720 rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */
721 #endif
722 #ifdef CONFIG_HUGETLB_PAGE
723 beq 6, 3f /* don't mask if page isn't huge */
724 li r13, 1
725 slw r13, r13, r14
726 subi r13, r13, 1
727 rlwinm r13, r13, 0, 0, 19 /* bottom bits used for WIMGE/etc */
728 andc r12, r12, r13 /* mask off ea bits within the page */
729 #endif
730 3: mtspr SPRN_MAS2, r12
731
732 #ifdef CONFIG_E200
733 /* Round robin TLB1 entries assignment */
734 mfspr r12, SPRN_MAS0
735
736 /* Extract TLB1CFG(NENTRY) */
737 mfspr r11, SPRN_TLB1CFG
738 andi. r11, r11, 0xfff
739
740 /* Extract MAS0(NV) */
741 andi. r13, r12, 0xfff
742 addi r13, r13, 1
743 cmpw 0, r13, r11
744 addi r12, r12, 1
745
746 /* check if we need to wrap */
747 blt 7f
748
749 /* wrap back to first free tlbcam entry */
750 lis r13, tlbcam_index@ha
751 lwz r13, tlbcam_index@l(r13)
752 rlwimi r12, r13, 0, 20, 31
753 7:
754 mtspr SPRN_MAS0,r12
755 #endif /* CONFIG_E200 */
756
757 tlb_write_entry:
758 tlbwe
759
760 /* Done...restore registers and get out of here. */
761 mfspr r10, SPRN_SPRG_THREAD
762 #ifdef CONFIG_HUGETLB_PAGE
763 beq 6, 8f /* skip restore for 4k page faults */
764 lwz r14, THREAD_NORMSAVE(4)(r10)
765 lwz r15, THREAD_NORMSAVE(5)(r10)
766 lwz r16, THREAD_NORMSAVE(6)(r10)
767 lwz r17, THREAD_NORMSAVE(7)(r10)
768 #endif
769 8: lwz r11, THREAD_NORMSAVE(3)(r10)
770 mtcr r11
771 lwz r13, THREAD_NORMSAVE(2)(r10)
772 lwz r12, THREAD_NORMSAVE(1)(r10)
773 lwz r11, THREAD_NORMSAVE(0)(r10)
774 mfspr r10, SPRN_SPRG_RSCRATCH0
775 rfi /* Force context change */
776
777 #ifdef CONFIG_SPE
778 /* Note that the SPE support is closely modeled after the AltiVec
779 * support. Changes to one are likely to be applicable to the
780 * other! */
781 load_up_spe:
782 /*
783 * Disable SPE for the task which had SPE previously,
784 * and save its SPE registers in its thread_struct.
785 * Enables SPE for use in the kernel on return.
786 * On SMP we know the SPE units are free, since we give it up every
787 * switch. -- Kumar
788 */
789 mfmsr r5
790 oris r5,r5,MSR_SPE@h
791 mtmsr r5 /* enable use of SPE now */
792 isync
793 /*
794 * For SMP, we don't do lazy SPE switching because it just gets too
795 * horrendously complex, especially when a task switches from one CPU
796 * to another. Instead we call giveup_spe in switch_to.
797 */
798 #ifndef CONFIG_SMP
799 lis r3,last_task_used_spe@ha
800 lwz r4,last_task_used_spe@l(r3)
801 cmpi 0,r4,0
802 beq 1f
803 addi r4,r4,THREAD /* want THREAD of last_task_used_spe */
804 SAVE_32EVRS(0,r10,r4,THREAD_EVR0)
805 evxor evr10, evr10, evr10 /* clear out evr10 */
806 evmwumiaa evr10, evr10, evr10 /* evr10 <- ACC = 0 * 0 + ACC */
807 li r5,THREAD_ACC
808 evstddx evr10, r4, r5 /* save off accumulator */
809 lwz r5,PT_REGS(r4)
810 lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
811 lis r10,MSR_SPE@h
812 andc r4,r4,r10 /* disable SPE for previous task */
813 stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
814 1:
815 #endif /* !CONFIG_SMP */
816 /* enable use of SPE after return */
817 oris r9,r9,MSR_SPE@h
818 mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
819 li r4,1
820 li r10,THREAD_ACC
821 stw r4,THREAD_USED_SPE(r5)
822 evlddx evr4,r10,r5
823 evmra evr4,evr4
824 REST_32EVRS(0,r10,r5,THREAD_EVR0)
825 #ifndef CONFIG_SMP
826 subi r4,r5,THREAD
827 stw r4,last_task_used_spe@l(r3)
828 #endif /* !CONFIG_SMP */
829 /* restore registers and return */
830 2: REST_4GPRS(3, r11)
831 lwz r10,_CCR(r11)
832 REST_GPR(1, r11)
833 mtcr r10
834 lwz r10,_LINK(r11)
835 mtlr r10
836 REST_GPR(10, r11)
837 mtspr SPRN_SRR1,r9
838 mtspr SPRN_SRR0,r12
839 REST_GPR(9, r11)
840 REST_GPR(12, r11)
841 lwz r11,GPR11(r11)
842 rfi
843
844 /*
845 * SPE unavailable trap from kernel - print a message, but let
846 * the task use SPE in the kernel until it returns to user mode.
847 */
848 KernelSPE:
849 lwz r3,_MSR(r1)
850 oris r3,r3,MSR_SPE@h
851 stw r3,_MSR(r1) /* enable use of SPE after return */
852 #ifdef CONFIG_PRINTK
853 lis r3,87f@h
854 ori r3,r3,87f@l
855 mr r4,r2 /* current */
856 lwz r5,_NIP(r1)
857 bl printk
858 #endif
859 b ret_from_except
860 #ifdef CONFIG_PRINTK
861 87: .string "SPE used in kernel (task=%p, pc=%x) \n"
862 #endif
863 .align 4,0
864
865 #endif /* CONFIG_SPE */
866
867 /*
868 * Global functions
869 */
870
871 /* Adjust or setup IVORs for e200 */
872 _GLOBAL(__setup_e200_ivors)
873 li r3,DebugDebug@l
874 mtspr SPRN_IVOR15,r3
875 li r3,SPEUnavailable@l
876 mtspr SPRN_IVOR32,r3
877 li r3,SPEFloatingPointData@l
878 mtspr SPRN_IVOR33,r3
879 li r3,SPEFloatingPointRound@l
880 mtspr SPRN_IVOR34,r3
881 sync
882 blr
883
884 /* Adjust or setup IVORs for e500v1/v2 */
885 _GLOBAL(__setup_e500_ivors)
886 li r3,DebugCrit@l
887 mtspr SPRN_IVOR15,r3
888 li r3,SPEUnavailable@l
889 mtspr SPRN_IVOR32,r3
890 li r3,SPEFloatingPointData@l
891 mtspr SPRN_IVOR33,r3
892 li r3,SPEFloatingPointRound@l
893 mtspr SPRN_IVOR34,r3
894 li r3,PerformanceMonitor@l
895 mtspr SPRN_IVOR35,r3
896 sync
897 blr
898
899 /* Adjust or setup IVORs for e500mc */
900 _GLOBAL(__setup_e500mc_ivors)
901 li r3,DebugDebug@l
902 mtspr SPRN_IVOR15,r3
903 li r3,PerformanceMonitor@l
904 mtspr SPRN_IVOR35,r3
905 li r3,Doorbell@l
906 mtspr SPRN_IVOR36,r3
907 li r3,CriticalDoorbell@l
908 mtspr SPRN_IVOR37,r3
909
910 /*
911 * We only want to touch IVOR38-41 if we're running on hardware
912 * that supports category E.HV. The architectural way to determine
913 * this is MMUCFG[LPIDSIZE].
914 */
915 mfspr r3, SPRN_MMUCFG
916 andis. r3, r3, MMUCFG_LPIDSIZE@h
917 beq no_hv
918 li r3,GuestDoorbell@l
919 mtspr SPRN_IVOR38,r3
920 li r3,CriticalGuestDoorbell@l
921 mtspr SPRN_IVOR39,r3
922 li r3,Hypercall@l
923 mtspr SPRN_IVOR40,r3
924 li r3,Ehvpriv@l
925 mtspr SPRN_IVOR41,r3
926 skip_hv_ivors:
927 sync
928 blr
929 no_hv:
930 lwz r3, CPU_SPEC_FEATURES(r5)
931 rlwinm r3, r3, 0, ~CPU_FTR_EMB_HV
932 stw r3, CPU_SPEC_FEATURES(r5)
933 b skip_hv_ivors
934
935 #ifdef CONFIG_SPE
936 /*
937 * extern void giveup_spe(struct task_struct *prev)
938 *
939 */
940 _GLOBAL(giveup_spe)
941 mfmsr r5
942 oris r5,r5,MSR_SPE@h
943 mtmsr r5 /* enable use of SPE now */
944 isync
945 cmpi 0,r3,0
946 beqlr- /* if no previous owner, done */
947 addi r3,r3,THREAD /* want THREAD of task */
948 lwz r5,PT_REGS(r3)
949 cmpi 0,r5,0
950 SAVE_32EVRS(0, r4, r3, THREAD_EVR0)
951 evxor evr6, evr6, evr6 /* clear out evr6 */
952 evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */
953 li r4,THREAD_ACC
954 evstddx evr6, r4, r3 /* save off accumulator */
955 beq 1f
956 lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
957 lis r3,MSR_SPE@h
958 andc r4,r4,r3 /* disable SPE for previous task */
959 stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
960 1:
961 #ifndef CONFIG_SMP
962 li r5,0
963 lis r4,last_task_used_spe@ha
964 stw r5,last_task_used_spe@l(r4)
965 #endif /* !CONFIG_SMP */
966 blr
967 #endif /* CONFIG_SPE */
968
969 /*
970 * extern void giveup_fpu(struct task_struct *prev)
971 *
972 * Not all FSL Book-E cores have an FPU
973 */
974 #ifndef CONFIG_PPC_FPU
975 _GLOBAL(giveup_fpu)
976 blr
977 #endif
978
979 /*
980 * extern void abort(void)
981 *
982 * At present, this routine just applies a system reset.
983 */
984 _GLOBAL(abort)
985 li r13,0
986 mtspr SPRN_DBCR0,r13 /* disable all debug events */
987 isync
988 mfmsr r13
989 ori r13,r13,MSR_DE@l /* Enable Debug Events */
990 mtmsr r13
991 isync
992 mfspr r13,SPRN_DBCR0
993 lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h
994 mtspr SPRN_DBCR0,r13
995 isync
996
997 _GLOBAL(set_context)
998
999 #ifdef CONFIG_BDI_SWITCH
1000 /* Context switch the PTE pointer for the Abatron BDI2000.
1001 * The PGDIR is the second parameter.
1002 */
1003 lis r5, abatron_pteptrs@h
1004 ori r5, r5, abatron_pteptrs@l
1005 stw r4, 0x4(r5)
1006 #endif
1007 mtspr SPRN_PID,r3
1008 isync /* Force context change */
1009 blr
1010
1011 _GLOBAL(flush_dcache_L1)
1012 mfspr r3,SPRN_L1CFG0
1013
1014 rlwinm r5,r3,9,3 /* Extract cache block size */
1015 twlgti r5,1 /* Only 32 and 64 byte cache blocks
1016 * are currently defined.
1017 */
1018 li r4,32
1019 subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) -
1020 * log2(number of ways)
1021 */
1022 slw r5,r4,r5 /* r5 = cache block size */
1023
1024 rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */
1025 mulli r7,r7,13 /* An 8-way cache will require 13
1026 * loads per set.
1027 */
1028 slw r7,r7,r6
1029
1030 /* save off HID0 and set DCFA */
1031 mfspr r8,SPRN_HID0
1032 ori r9,r8,HID0_DCFA@l
1033 mtspr SPRN_HID0,r9
1034 isync
1035
1036 lis r4,KERNELBASE@h
1037 mtctr r7
1038
1039 1: lwz r3,0(r4) /* Load... */
1040 add r4,r4,r5
1041 bdnz 1b
1042
1043 msync
1044 lis r4,KERNELBASE@h
1045 mtctr r7
1046
1047 1: dcbf 0,r4 /* ...and flush. */
1048 add r4,r4,r5
1049 bdnz 1b
1050
1051 /* restore HID0 */
1052 mtspr SPRN_HID0,r8
1053 isync
1054
1055 blr
1056
1057 #ifdef CONFIG_SMP
1058 /* When we get here, r24 needs to hold the CPU # */
1059 .globl __secondary_start
1060 __secondary_start:
1061 lis r3,__secondary_hold_acknowledge@h
1062 ori r3,r3,__secondary_hold_acknowledge@l
1063 stw r24,0(r3)
1064
1065 li r3,0
1066 mr r4,r24 /* Why? */
1067 bl call_setup_cpu
1068
1069 lis r3,tlbcam_index@ha
1070 lwz r3,tlbcam_index@l(r3)
1071 mtctr r3
1072 li r26,0 /* r26 safe? */
1073
1074 /* Load each CAM entry */
1075 1: mr r3,r26
1076 bl loadcam_entry
1077 addi r26,r26,1
1078 bdnz 1b
1079
1080 /* get current_thread_info and current */
1081 lis r1,secondary_ti@ha
1082 lwz r1,secondary_ti@l(r1)
1083 lwz r2,TI_TASK(r1)
1084
1085 /* stack */
1086 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
1087 li r0,0
1088 stw r0,0(r1)
1089
1090 /* ptr to current thread */
1091 addi r4,r2,THREAD /* address of our thread_struct */
1092 mtspr SPRN_SPRG_THREAD,r4
1093
1094 /* Setup the defaults for TLB entries */
1095 li r4,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l
1096 mtspr SPRN_MAS4,r4
1097
1098 /* Jump to start_secondary */
1099 lis r4,MSR_KERNEL@h
1100 ori r4,r4,MSR_KERNEL@l
1101 lis r3,start_secondary@h
1102 ori r3,r3,start_secondary@l
1103 mtspr SPRN_SRR0,r3
1104 mtspr SPRN_SRR1,r4
1105 sync
1106 rfi
1107 sync
1108
1109 .globl __secondary_hold_acknowledge
1110 __secondary_hold_acknowledge:
1111 .long -1
1112 #endif
1113
1114 /*
1115 * We put a few things here that have to be page-aligned. This stuff
1116 * goes at the beginning of the data segment, which is page-aligned.
1117 */
1118 .data
1119 .align 12
1120 .globl sdata
1121 sdata:
1122 .globl empty_zero_page
1123 empty_zero_page:
1124 .space 4096
1125 .globl swapper_pg_dir
1126 swapper_pg_dir:
1127 .space PGD_TABLE_SIZE
1128
1129 /*
1130 * Room for two PTE pointers, usually the kernel and current user pointers
1131 * to their respective root page table.
1132 */
1133 abatron_pteptrs:
1134 .space 8
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