2 * Kernel execution entry point code.
4 * Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org>
5 * Initial PowerPC version.
6 * Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu>
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>
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.
33 #include <linux/threads.h>
34 #include <asm/processor.h>
37 #include <asm/pgtable.h>
38 #include <asm/cputable.h>
39 #include <asm/thread_info.h>
40 #include <asm/ppc_asm.h>
41 #include <asm/asm-offsets.h>
42 #include <asm/cache.h>
43 #include "head_booke.h"
45 /* As with the other PowerPC ports, it is expected that when code
46 * execution begins here, the following registers contain valid, yet
47 * optional, information:
49 * r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.)
50 * r4 - Starting address of the init RAM disk
51 * r5 - Ending address of the init RAM disk
52 * r6 - Start of kernel command line string (e.g. "mem=128")
53 * r7 - End of kernel command line string
56 .section .text.head, "ax"
60 * Reserve a word at a fixed location to store the address
65 * Save parameters we are passed
72 li r25,0 /* phys kernel start (low) */
73 li r24,0 /* CPU number */
74 li r23,0 /* phys kernel start (high) */
76 /* We try to not make any assumptions about how the boot loader
77 * setup or used the TLBs. We invalidate all mappings from the
78 * boot loader and load a single entry in TLB1[0] to map the
79 * first 64M of kernel memory. Any boot info passed from the
80 * bootloader needs to live in this first 64M.
82 * Requirement on bootloader:
83 * - The page we're executing in needs to reside in TLB1 and
84 * have IPROT=1. If not an invalidate broadcast could
85 * evict the entry we're currently executing in.
87 * r3 = Index of TLB1 were executing in
88 * r4 = Current MSR[IS]
89 * r5 = Index of TLB1 temp mapping
91 * Later in mapin_ram we will correctly map lowmem, and resize TLB1[0]
96 /* 1. Find the index of the entry we're executing in */
97 bl invstr /* Find our address */
98 invstr: mflr r6 /* Make it accessible */
100 rlwinm r4,r7,27,31,31 /* extract MSR[IS] */
105 tlbsx 0,r6 /* search MSR[IS], SPID=PID0 */
108 andis. r7,r7,MAS1_VALID@h
114 tlbsx 0,r6 /* search MSR[IS], SPID=PID1 */
116 andis. r7,r7,MAS1_VALID@h
122 tlbsx 0,r6 /* Fall through, we had to match */
126 rlwinm r3,r7,16,20,31 /* Extract MAS0(Entry) */
128 mfspr r7,SPRN_MAS1 /* Insure IPROT set */
129 oris r7,r7,MAS1_IPROT@h
133 /* 2. Invalidate all entries except the entry we're executing in */
134 mfspr r9,SPRN_TLB1CFG
136 li r6,0 /* Set Entry counter to 0 */
137 1: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
138 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
142 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
144 beq skpinv /* Dont update the current execution TLB */
148 skpinv: addi r6,r6,1 /* Increment */
149 cmpw r6,r9 /* Are we done? */
150 bne 1b /* If not, repeat */
152 /* Invalidate TLB0 */
156 /* Invalidate TLB1 */
161 /* 3. Setup a temp mapping and jump to it */
162 andi. r5, r3, 0x1 /* Find an entry not used and is non-zero */
164 lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
165 rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
169 /* grab and fixup the RPN */
170 mfspr r6,SPRN_MAS1 /* extract MAS1[SIZE] */
171 rlwinm r6,r6,25,27,30
174 slw r6,r8,r6 /* convert to mask */
176 bl 1f /* Find our address */
180 #ifdef CONFIG_PHYS_64BIT
188 ori r8,r25,(MAS3_SX|MAS3_SW|MAS3_SR)
190 /* Just modify the entry ID and EPN for the temp mapping */
191 lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
192 rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */
194 xori r6,r4,1 /* Setup TMP mapping in the other Address space */
196 oris r6,r6,(MAS1_VALID|MAS1_IPROT)@h
197 ori r6,r6,(MAS1_TSIZE(BOOKE_PAGESZ_4K))@l
200 li r7,0 /* temp EPN = 0 */
207 slwi r6,r6,5 /* setup new context with other address space */
208 bl 1f /* Find our address */
216 /* 4. Clear out PIDs & Search info */
225 /* 5. Invalidate mapping we started in */
226 lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
227 rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */
231 rlwinm r6,r6,0,2,0 /* clear IPROT */
234 /* Invalidate TLB1 */
239 /* The mapping only needs to be cache-coherent on SMP */
241 #define M_IF_SMP MAS2_M
246 /* 6. Setup KERNELBASE mapping in TLB1[0] */
247 lis r6,0x1000 /* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */
249 lis r6,(MAS1_VALID|MAS1_IPROT)@h
250 ori r6,r6,(MAS1_TSIZE(BOOKE_PAGESZ_64M))@l
252 lis r6,MAS2_VAL(PAGE_OFFSET, BOOKE_PAGESZ_64M, M_IF_SMP)@h
253 ori r6,r6,MAS2_VAL(PAGE_OFFSET, BOOKE_PAGESZ_64M, M_IF_SMP)@l
258 /* 7. Jump to KERNELBASE mapping */
259 lis r6,(KERNELBASE & ~0xfff)@h
260 ori r6,r6,(KERNELBASE & ~0xfff)@l
262 ori r7,r7,MSR_KERNEL@l
263 bl 1f /* Find our address */
269 rfi /* start execution out of TLB1[0] entry */
271 /* 8. Clear out the temp mapping */
272 2: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */
273 rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */
277 rlwinm r8,r8,0,2,0 /* clear IPROT */
280 /* Invalidate TLB1 */
285 /* Establish the interrupt vector offsets */
286 SET_IVOR(0, CriticalInput);
287 SET_IVOR(1, MachineCheck);
288 SET_IVOR(2, DataStorage);
289 SET_IVOR(3, InstructionStorage);
290 SET_IVOR(4, ExternalInput);
291 SET_IVOR(5, Alignment);
292 SET_IVOR(6, Program);
293 SET_IVOR(7, FloatingPointUnavailable);
294 SET_IVOR(8, SystemCall);
295 SET_IVOR(9, AuxillaryProcessorUnavailable);
296 SET_IVOR(10, Decrementer);
297 SET_IVOR(11, FixedIntervalTimer);
298 SET_IVOR(12, WatchdogTimer);
299 SET_IVOR(13, DataTLBError);
300 SET_IVOR(14, InstructionTLBError);
301 SET_IVOR(15, DebugDebug);
302 #if defined(CONFIG_E500) && !defined(CONFIG_PPC_E500MC)
303 SET_IVOR(15, DebugCrit);
305 SET_IVOR(32, SPEUnavailable);
306 SET_IVOR(33, SPEFloatingPointData);
307 SET_IVOR(34, SPEFloatingPointRound);
309 SET_IVOR(35, PerformanceMonitor);
311 #ifdef CONFIG_PPC_E500MC
312 SET_IVOR(36, Doorbell);
315 /* Establish the interrupt vector base */
316 lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */
319 /* Setup the defaults for TLB entries */
320 li r2,(MAS4_TSIZED(BOOKE_PAGESZ_4K))@l
322 oris r2,r2,MAS4_TLBSELD(1)@h
329 oris r2,r2,HID0_DOZE@h
333 /* enable dedicated debug exception handling resources (Debug APU) */
335 ori r2,r2,HID0_DAPUEN@l
339 #if !defined(CONFIG_BDI_SWITCH)
341 * The Abatron BDI JTAG debugger does not tolerate others
342 * mucking with the debug registers.
347 /* clear any residual debug events */
353 /* Check to see if we're the second processor, and jump
354 * to the secondary_start code if so
358 bne __secondary_start
362 * This is where the main kernel code starts.
367 ori r2,r2,init_task@l
369 /* ptr to current thread */
370 addi r4,r2,THREAD /* init task's THREAD */
374 lis r1,init_thread_union@h
375 ori r1,r1,init_thread_union@l
377 stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
381 #ifdef CONFIG_RELOCATABLE
382 lis r3,kernstart_addr@ha
383 la r3,kernstart_addr@l(r3)
384 #ifdef CONFIG_PHYS_64BIT
393 * Decide what sort of machine this is and initialize the MMU.
403 /* Setup PTE pointers for the Abatron bdiGDB */
404 lis r6, swapper_pg_dir@h
405 ori r6, r6, swapper_pg_dir@l
406 lis r5, abatron_pteptrs@h
407 ori r5, r5, abatron_pteptrs@l
409 ori r4, r4, KERNELBASE@l
410 stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */
414 lis r4,start_kernel@h
415 ori r4,r4,start_kernel@l
417 ori r3,r3,MSR_KERNEL@l
420 rfi /* change context and jump to start_kernel */
422 /* Macros to hide the PTE size differences
424 * FIND_PTE -- walks the page tables given EA & pgdir pointer
426 * r11 -- PGDIR pointer
428 * label 2: is the bailout case
430 * if we find the pte (fall through):
431 * r11 is low pte word
432 * r12 is pointer to the pte
434 #ifdef CONFIG_PTE_64BIT
436 rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
437 lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
438 rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \
439 beq 2f; /* Bail if no table */ \
440 rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
441 lwz r11, 4(r12); /* Get pte entry */
444 rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \
445 lwz r11, 0(r11); /* Get L1 entry */ \
446 rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \
447 beq 2f; /* Bail if no table */ \
448 rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \
449 lwz r11, 0(r12); /* Get Linux PTE */
453 * Interrupt vector entry code
455 * The Book E MMUs are always on so we don't need to handle
456 * interrupts in real mode as with previous PPC processors. In
457 * this case we handle interrupts in the kernel virtual address
460 * Interrupt vectors are dynamically placed relative to the
461 * interrupt prefix as determined by the address of interrupt_base.
462 * The interrupt vectors offsets are programmed using the labels
463 * for each interrupt vector entry.
465 * Interrupt vectors must be aligned on a 16 byte boundary.
466 * We align on a 32 byte cache line boundary for good measure.
470 /* Critical Input Interrupt */
471 CRITICAL_EXCEPTION(0x0100, CriticalInput, unknown_exception)
473 /* Machine Check Interrupt */
475 /* no RFMCI, MCSRRs on E200 */
476 CRITICAL_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
478 MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
481 /* Data Storage Interrupt */
482 START_EXCEPTION(DataStorage)
483 NORMAL_EXCEPTION_PROLOG
484 mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */
486 mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */
487 andis. r10,r5,(ESR_ILK|ESR_DLK)@h
489 EXC_XFER_EE_LITE(0x0300, handle_page_fault)
491 addi r3,r1,STACK_FRAME_OVERHEAD
492 EXC_XFER_EE_LITE(0x0300, CacheLockingException)
494 /* Instruction Storage Interrupt */
495 INSTRUCTION_STORAGE_EXCEPTION
497 /* External Input Interrupt */
498 EXCEPTION(0x0500, ExternalInput, do_IRQ, EXC_XFER_LITE)
500 /* Alignment Interrupt */
503 /* Program Interrupt */
506 /* Floating Point Unavailable Interrupt */
507 #ifdef CONFIG_PPC_FPU
508 FP_UNAVAILABLE_EXCEPTION
511 /* E200 treats 'normal' floating point instructions as FP Unavail exception */
512 EXCEPTION(0x0800, FloatingPointUnavailable, program_check_exception, EXC_XFER_EE)
514 EXCEPTION(0x0800, FloatingPointUnavailable, unknown_exception, EXC_XFER_EE)
518 /* System Call Interrupt */
519 START_EXCEPTION(SystemCall)
520 NORMAL_EXCEPTION_PROLOG
521 EXC_XFER_EE_LITE(0x0c00, DoSyscall)
523 /* Auxillary Processor Unavailable Interrupt */
524 EXCEPTION(0x2900, AuxillaryProcessorUnavailable, unknown_exception, EXC_XFER_EE)
526 /* Decrementer Interrupt */
527 DECREMENTER_EXCEPTION
529 /* Fixed Internal Timer Interrupt */
530 /* TODO: Add FIT support */
531 EXCEPTION(0x3100, FixedIntervalTimer, unknown_exception, EXC_XFER_EE)
533 /* Watchdog Timer Interrupt */
534 #ifdef CONFIG_BOOKE_WDT
535 CRITICAL_EXCEPTION(0x3200, WatchdogTimer, WatchdogException)
537 CRITICAL_EXCEPTION(0x3200, WatchdogTimer, unknown_exception)
540 /* Data TLB Error Interrupt */
541 START_EXCEPTION(DataTLBError)
542 mtspr SPRN_SPRG0, r10 /* Save some working registers */
543 mtspr SPRN_SPRG1, r11
544 mtspr SPRN_SPRG4W, r12
545 mtspr SPRN_SPRG5W, r13
547 mtspr SPRN_SPRG7W, r11
548 mfspr r10, SPRN_DEAR /* Get faulting address */
550 /* If we are faulting a kernel address, we have to use the
551 * kernel page tables.
553 lis r11, PAGE_OFFSET@h
556 lis r11, swapper_pg_dir@h
557 ori r11, r11, swapper_pg_dir@l
559 mfspr r12,SPRN_MAS1 /* Set TID to 0 */
560 rlwinm r12,r12,0,16,1
565 /* Get the PGD for the current thread */
571 /* Mask of required permission bits. Note that while we
572 * do copy ESR:ST to _PAGE_RW position as trying to write
573 * to an RO page is pretty common, we don't do it with
574 * _PAGE_DIRTY. We could do it, but it's a fairly rare
575 * event so I'd rather take the overhead when it happens
576 * rather than adding an instruction here. We should measure
577 * whether the whole thing is worth it in the first place
578 * as we could avoid loading SPRN_ESR completely in the first
581 * TODO: Is it worth doing that mfspr & rlwimi in the first
582 * place or can we save a couple of instructions here ?
585 li r13,_PAGE_PRESENT|_PAGE_ACCESSED
586 rlwimi r13,r12,11,29,29
589 andc. r13,r13,r11 /* Check permission */
591 #ifdef CONFIG_PTE_64BIT
593 subf r10,r11,r12 /* create false data dep */
594 lwzx r13,r11,r10 /* Get upper pte bits */
596 lwz r13,0(r12) /* Get upper pte bits */
600 bne 2f /* Bail if permission/valid mismach */
602 /* Jump to common tlb load */
605 /* The bailout. Restore registers to pre-exception conditions
606 * and call the heavyweights to help us out.
608 mfspr r11, SPRN_SPRG7R
610 mfspr r13, SPRN_SPRG5R
611 mfspr r12, SPRN_SPRG4R
612 mfspr r11, SPRN_SPRG1
613 mfspr r10, SPRN_SPRG0
616 /* Instruction TLB Error Interrupt */
618 * Nearly the same as above, except we get our
619 * information from different registers and bailout
620 * to a different point.
622 START_EXCEPTION(InstructionTLBError)
623 mtspr SPRN_SPRG0, r10 /* Save some working registers */
624 mtspr SPRN_SPRG1, r11
625 mtspr SPRN_SPRG4W, r12
626 mtspr SPRN_SPRG5W, r13
628 mtspr SPRN_SPRG7W, r11
629 mfspr r10, SPRN_SRR0 /* Get faulting address */
631 /* If we are faulting a kernel address, we have to use the
632 * kernel page tables.
634 lis r11, PAGE_OFFSET@h
637 lis r11, swapper_pg_dir@h
638 ori r11, r11, swapper_pg_dir@l
640 mfspr r12,SPRN_MAS1 /* Set TID to 0 */
641 rlwinm r12,r12,0,16,1
646 /* Get the PGD for the current thread */
652 /* Make up the required permissions */
653 li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_HWEXEC
656 andc. r13,r13,r11 /* Check permission */
658 #ifdef CONFIG_PTE_64BIT
660 subf r10,r11,r12 /* create false data dep */
661 lwzx r13,r11,r10 /* Get upper pte bits */
663 lwz r13,0(r12) /* Get upper pte bits */
667 bne 2f /* Bail if permission mismach */
669 /* Jump to common TLB load point */
673 /* The bailout. Restore registers to pre-exception conditions
674 * and call the heavyweights to help us out.
676 mfspr r11, SPRN_SPRG7R
678 mfspr r13, SPRN_SPRG5R
679 mfspr r12, SPRN_SPRG4R
680 mfspr r11, SPRN_SPRG1
681 mfspr r10, SPRN_SPRG0
685 /* SPE Unavailable */
686 START_EXCEPTION(SPEUnavailable)
687 NORMAL_EXCEPTION_PROLOG
689 addi r3,r1,STACK_FRAME_OVERHEAD
690 EXC_XFER_EE_LITE(0x2010, KernelSPE)
692 EXCEPTION(0x2020, SPEUnavailable, unknown_exception, EXC_XFER_EE)
693 #endif /* CONFIG_SPE */
695 /* SPE Floating Point Data */
697 EXCEPTION(0x2030, SPEFloatingPointData, SPEFloatingPointException, EXC_XFER_EE);
699 /* SPE Floating Point Round */
700 EXCEPTION(0x2050, SPEFloatingPointRound, SPEFloatingPointRoundException, EXC_XFER_EE)
702 EXCEPTION(0x2040, SPEFloatingPointData, unknown_exception, EXC_XFER_EE)
703 EXCEPTION(0x2050, SPEFloatingPointRound, unknown_exception, EXC_XFER_EE)
704 #endif /* CONFIG_SPE */
706 /* Performance Monitor */
707 EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD)
709 #ifdef CONFIG_PPC_E500MC
710 EXCEPTION(0x2070, Doorbell, unknown_exception, EXC_XFER_STD)
713 /* Debug Interrupt */
714 DEBUG_DEBUG_EXCEPTION
715 #if defined(CONFIG_E500) && !defined(CONFIG_PPC_E500MC)
724 * Both the instruction and data TLB miss get to this
725 * point to load the TLB.
726 * r10 - available to use
727 * r11 - TLB (info from Linux PTE)
728 * r12 - available to use
729 * r13 - upper bits of PTE (if PTE_64BIT) or available to use
730 * CR5 - results of addr >= PAGE_OFFSET
731 * MAS0, MAS1 - loaded with proper value when we get here
732 * MAS2, MAS3 - will need additional info from Linux PTE
733 * Upon exit, we reload everything and RFI.
737 * We set execute, because we don't have the granularity to
738 * properly set this at the page level (Linux problem).
739 * Many of these bits are software only. Bits we don't set
740 * here we (properly should) assume have the appropriate value.
744 #ifdef CONFIG_PTE_64BIT
745 rlwimi r12, r11, 26, 24, 31 /* extract ...WIMGE from pte */
747 rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */
754 li r10, (_PAGE_HWEXEC | _PAGE_PRESENT)
755 rlwimi r10, r11, 31, 29, 29 /* extract _PAGE_DIRTY into SW */
757 andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */
762 #ifdef CONFIG_PTE_64BIT
763 rlwimi r12, r13, 24, 0, 7 /* grab RPN[32:39] */
764 rlwimi r12, r11, 24, 8, 19 /* grab RPN[40:51] */
766 BEGIN_MMU_FTR_SECTION
767 srwi r10, r13, 8 /* grab RPN[8:31] */
769 END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
771 rlwimi r11, r12, 0, 20, 31 /* Extract RPN from PTE and merge with perms */
775 /* Round robin TLB1 entries assignment */
778 /* Extract TLB1CFG(NENTRY) */
779 mfspr r11, SPRN_TLB1CFG
780 andi. r11, r11, 0xfff
782 /* Extract MAS0(NV) */
783 andi. r13, r12, 0xfff
788 /* check if we need to wrap */
791 /* wrap back to first free tlbcam entry */
792 lis r13, tlbcam_index@ha
793 lwz r13, tlbcam_index@l(r13)
794 rlwimi r12, r13, 0, 20, 31
797 #endif /* CONFIG_E200 */
801 /* Done...restore registers and get out of here. */
802 mfspr r11, SPRN_SPRG7R
804 mfspr r13, SPRN_SPRG5R
805 mfspr r12, SPRN_SPRG4R
806 mfspr r11, SPRN_SPRG1
807 mfspr r10, SPRN_SPRG0
808 rfi /* Force context change */
811 /* Note that the SPE support is closely modeled after the AltiVec
812 * support. Changes to one are likely to be applicable to the
816 * Disable SPE for the task which had SPE previously,
817 * and save its SPE registers in its thread_struct.
818 * Enables SPE for use in the kernel on return.
819 * On SMP we know the SPE units are free, since we give it up every
824 mtmsr r5 /* enable use of SPE now */
827 * For SMP, we don't do lazy SPE switching because it just gets too
828 * horrendously complex, especially when a task switches from one CPU
829 * to another. Instead we call giveup_spe in switch_to.
832 lis r3,last_task_used_spe@ha
833 lwz r4,last_task_used_spe@l(r3)
836 addi r4,r4,THREAD /* want THREAD of last_task_used_spe */
837 SAVE_32EVRS(0,r10,r4)
838 evxor evr10, evr10, evr10 /* clear out evr10 */
839 evmwumiaa evr10, evr10, evr10 /* evr10 <- ACC = 0 * 0 + ACC */
841 evstddx evr10, r4, r5 /* save off accumulator */
843 lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
845 andc r4,r4,r10 /* disable SPE for previous task */
846 stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
848 #endif /* !CONFIG_SMP */
849 /* enable use of SPE after return */
851 mfspr r5,SPRN_SPRG3 /* current task's THREAD (phys) */
854 stw r4,THREAD_USED_SPE(r5)
857 REST_32EVRS(0,r10,r5)
860 stw r4,last_task_used_spe@l(r3)
861 #endif /* !CONFIG_SMP */
862 /* restore registers and return */
863 2: REST_4GPRS(3, r11)
878 * SPE unavailable trap from kernel - print a message, but let
879 * the task use SPE in the kernel until it returns to user mode.
884 stw r3,_MSR(r1) /* enable use of SPE after return */
887 mr r4,r2 /* current */
891 87: .string "SPE used in kernel (task=%p, pc=%x) \n"
894 #endif /* CONFIG_SPE */
901 * extern void loadcam_entry(unsigned int index)
903 * Load TLBCAM[index] entry in to the L2 CAM MMU
905 _GLOBAL(loadcam_entry)
908 mulli r5,r3,TLBCAM_SIZE
923 * extern void giveup_altivec(struct task_struct *prev)
925 * The e500 core does not have an AltiVec unit.
927 _GLOBAL(giveup_altivec)
932 * extern void giveup_spe(struct task_struct *prev)
938 mtmsr r5 /* enable use of SPE now */
941 beqlr- /* if no previous owner, done */
942 addi r3,r3,THREAD /* want THREAD of task */
945 SAVE_32EVRS(0, r4, r3)
946 evxor evr6, evr6, evr6 /* clear out evr6 */
947 evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */
949 evstddx evr6, r4, r3 /* save off accumulator */
950 mfspr r6,SPRN_SPEFSCR
951 stw r6,THREAD_SPEFSCR(r3) /* save spefscr register value */
953 lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
955 andc r4,r4,r3 /* disable SPE for previous task */
956 stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
960 lis r4,last_task_used_spe@ha
961 stw r5,last_task_used_spe@l(r4)
962 #endif /* !CONFIG_SMP */
964 #endif /* CONFIG_SPE */
967 * extern void giveup_fpu(struct task_struct *prev)
969 * Not all FSL Book-E cores have an FPU
971 #ifndef CONFIG_PPC_FPU
977 * extern void abort(void)
979 * At present, this routine just applies a system reset.
983 mtspr SPRN_DBCR0,r13 /* disable all debug events */
986 ori r13,r13,MSR_DE@l /* Enable Debug Events */
990 lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h
996 #ifdef CONFIG_BDI_SWITCH
997 /* Context switch the PTE pointer for the Abatron BDI2000.
998 * The PGDIR is the second parameter.
1000 lis r5, abatron_pteptrs@h
1001 ori r5, r5, abatron_pteptrs@l
1005 isync /* Force context change */
1008 _GLOBAL(flush_dcache_L1)
1009 mfspr r3,SPRN_L1CFG0
1011 rlwinm r5,r3,9,3 /* Extract cache block size */
1012 twlgti r5,1 /* Only 32 and 64 byte cache blocks
1013 * are currently defined.
1016 subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) -
1017 * log2(number of ways)
1019 slw r5,r4,r5 /* r5 = cache block size */
1021 rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */
1022 mulli r7,r7,13 /* An 8-way cache will require 13
1027 /* save off HID0 and set DCFA */
1029 ori r9,r8,HID0_DCFA@l
1036 1: lwz r3,0(r4) /* Load... */
1044 1: dcbf 0,r4 /* ...and flush. */
1055 /* When we get here, r24 needs to hold the CPU # */
1056 .globl __secondary_start
1058 lis r3,__secondary_hold_acknowledge@h
1059 ori r3,r3,__secondary_hold_acknowledge@l
1063 mr r4,r24 /* Why? */
1066 lis r3,tlbcam_index@ha
1067 lwz r3,tlbcam_index@l(r3)
1069 li r26,0 /* r26 safe? */
1071 /* Load each CAM entry */
1077 /* get current_thread_info and current */
1078 lis r1,secondary_ti@ha
1079 lwz r1,secondary_ti@l(r1)
1083 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
1087 /* ptr to current thread */
1088 addi r4,r2,THREAD /* address of our thread_struct */
1091 /* Setup the defaults for TLB entries */
1092 li r4,(MAS4_TSIZED(BOOKE_PAGESZ_4K))@l
1095 /* Jump to start_secondary */
1097 ori r4,r4,MSR_KERNEL@l
1098 lis r3,start_secondary@h
1099 ori r3,r3,start_secondary@l
1106 .globl __secondary_hold_acknowledge
1107 __secondary_hold_acknowledge:
1112 * We put a few things here that have to be page-aligned. This stuff
1113 * goes at the beginning of the data segment, which is page-aligned.
1119 .globl empty_zero_page
1122 .globl swapper_pg_dir
1124 .space PGD_TABLE_SIZE
1127 * Room for two PTE pointers, usually the kernel and current user pointers
1128 * to their respective root page table.