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/init.h>
34 #include <linux/threads.h>
35 #include <asm/processor.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 "head_booke.h"
46 /* As with the other PowerPC ports, it is expected that when code
47 * execution begins here, the following registers contain valid, yet
48 * optional, information:
50 * r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.)
51 * r4 - Starting address of the init RAM disk
52 * r5 - Ending address of the init RAM disk
53 * r6 - Start of kernel command line string (e.g. "mem=128")
54 * r7 - End of kernel command line string
61 * Reserve a word at a fixed location to store the address
66 * Save parameters we are passed
73 li r25,0 /* phys kernel start (low) */
74 li r24,0 /* CPU number */
75 li r23,0 /* phys kernel start (high) */
77 /* We try to not make any assumptions about how the boot loader
78 * setup or used the TLBs. We invalidate all mappings from the
79 * boot loader and load a single entry in TLB1[0] to map the
80 * first 64M of kernel memory. Any boot info passed from the
81 * bootloader needs to live in this first 64M.
83 * Requirement on bootloader:
84 * - The page we're executing in needs to reside in TLB1 and
85 * have IPROT=1. If not an invalidate broadcast could
86 * evict the entry we're currently executing in.
88 * r3 = Index of TLB1 were executing in
89 * r4 = Current MSR[IS]
90 * r5 = Index of TLB1 temp mapping
92 * Later in mapin_ram we will correctly map lowmem, and resize TLB1[0]
98 #include "fsl_booke_entry_mapping.S"
100 /* Establish the interrupt vector offsets */
101 SET_IVOR(0, CriticalInput);
102 SET_IVOR(1, MachineCheck);
103 SET_IVOR(2, DataStorage);
104 SET_IVOR(3, InstructionStorage);
105 SET_IVOR(4, ExternalInput);
106 SET_IVOR(5, Alignment);
107 SET_IVOR(6, Program);
108 SET_IVOR(7, FloatingPointUnavailable);
109 SET_IVOR(8, SystemCall);
110 SET_IVOR(9, AuxillaryProcessorUnavailable);
111 SET_IVOR(10, Decrementer);
112 SET_IVOR(11, FixedIntervalTimer);
113 SET_IVOR(12, WatchdogTimer);
114 SET_IVOR(13, DataTLBError);
115 SET_IVOR(14, InstructionTLBError);
116 SET_IVOR(15, DebugCrit);
118 /* Establish the interrupt vector base */
119 lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */
122 /* Setup the defaults for TLB entries */
123 li r2,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l
125 oris r2,r2,MAS4_TLBSELD(1)@h
132 oris r2,r2,HID0_DOZE@h
136 #if !defined(CONFIG_BDI_SWITCH)
138 * The Abatron BDI JTAG debugger does not tolerate others
139 * mucking with the debug registers.
144 /* clear any residual debug events */
150 /* Check to see if we're the second processor, and jump
151 * to the secondary_start code if so
155 bne __secondary_start
159 * This is where the main kernel code starts.
164 ori r2,r2,init_task@l
166 /* ptr to current thread */
167 addi r4,r2,THREAD /* init task's THREAD */
168 mtspr SPRN_SPRG_THREAD,r4
171 lis r1,init_thread_union@h
172 ori r1,r1,init_thread_union@l
174 stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
178 #ifdef CONFIG_RELOCATABLE
179 lis r3,kernstart_addr@ha
180 la r3,kernstart_addr@l(r3)
181 #ifdef CONFIG_PHYS_64BIT
190 * Decide what sort of machine this is and initialize the MMU.
200 /* Setup PTE pointers for the Abatron bdiGDB */
201 lis r6, swapper_pg_dir@h
202 ori r6, r6, swapper_pg_dir@l
203 lis r5, abatron_pteptrs@h
204 ori r5, r5, abatron_pteptrs@l
206 ori r4, r4, KERNELBASE@l
207 stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */
211 lis r4,start_kernel@h
212 ori r4,r4,start_kernel@l
214 ori r3,r3,MSR_KERNEL@l
217 rfi /* change context and jump to start_kernel */
219 /* Macros to hide the PTE size differences
221 * FIND_PTE -- walks the page tables given EA & pgdir pointer
223 * r11 -- PGDIR pointer
225 * label 2: is the bailout case
227 * if we find the pte (fall through):
228 * r11 is low pte word
229 * r12 is pointer to the pte
231 #ifdef CONFIG_PTE_64BIT
233 rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \
234 lwzx r11, r12, r11; /* Get pgd/pmd entry */ \
235 rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \
236 beq 2f; /* Bail if no table */ \
237 rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \
238 lwz r11, 4(r12); /* Get pte entry */
241 rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \
242 lwz r11, 0(r11); /* Get L1 entry */ \
243 rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \
244 beq 2f; /* Bail if no table */ \
245 rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \
246 lwz r11, 0(r12); /* Get Linux PTE */
250 * Interrupt vector entry code
252 * The Book E MMUs are always on so we don't need to handle
253 * interrupts in real mode as with previous PPC processors. In
254 * this case we handle interrupts in the kernel virtual address
257 * Interrupt vectors are dynamically placed relative to the
258 * interrupt prefix as determined by the address of interrupt_base.
259 * The interrupt vectors offsets are programmed using the labels
260 * for each interrupt vector entry.
262 * Interrupt vectors must be aligned on a 16 byte boundary.
263 * We align on a 32 byte cache line boundary for good measure.
267 /* Critical Input Interrupt */
268 CRITICAL_EXCEPTION(0x0100, CriticalInput, unknown_exception)
270 /* Machine Check Interrupt */
272 /* no RFMCI, MCSRRs on E200 */
273 CRITICAL_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
275 MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception)
278 /* Data Storage Interrupt */
279 START_EXCEPTION(DataStorage)
280 NORMAL_EXCEPTION_PROLOG
281 mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */
283 mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */
284 andis. r10,r5,(ESR_ILK|ESR_DLK)@h
286 EXC_XFER_EE_LITE(0x0300, handle_page_fault)
288 addi r3,r1,STACK_FRAME_OVERHEAD
289 EXC_XFER_EE_LITE(0x0300, CacheLockingException)
291 /* Instruction Storage Interrupt */
292 INSTRUCTION_STORAGE_EXCEPTION
294 /* External Input Interrupt */
295 EXCEPTION(0x0500, ExternalInput, do_IRQ, EXC_XFER_LITE)
297 /* Alignment Interrupt */
300 /* Program Interrupt */
303 /* Floating Point Unavailable Interrupt */
304 #ifdef CONFIG_PPC_FPU
305 FP_UNAVAILABLE_EXCEPTION
308 /* E200 treats 'normal' floating point instructions as FP Unavail exception */
309 EXCEPTION(0x0800, FloatingPointUnavailable, program_check_exception, EXC_XFER_EE)
311 EXCEPTION(0x0800, FloatingPointUnavailable, unknown_exception, EXC_XFER_EE)
315 /* System Call Interrupt */
316 START_EXCEPTION(SystemCall)
317 NORMAL_EXCEPTION_PROLOG
318 EXC_XFER_EE_LITE(0x0c00, DoSyscall)
320 /* Auxillary Processor Unavailable Interrupt */
321 EXCEPTION(0x2900, AuxillaryProcessorUnavailable, unknown_exception, EXC_XFER_EE)
323 /* Decrementer Interrupt */
324 DECREMENTER_EXCEPTION
326 /* Fixed Internal Timer Interrupt */
327 /* TODO: Add FIT support */
328 EXCEPTION(0x3100, FixedIntervalTimer, unknown_exception, EXC_XFER_EE)
330 /* Watchdog Timer Interrupt */
331 #ifdef CONFIG_BOOKE_WDT
332 CRITICAL_EXCEPTION(0x3200, WatchdogTimer, WatchdogException)
334 CRITICAL_EXCEPTION(0x3200, WatchdogTimer, unknown_exception)
337 /* Data TLB Error Interrupt */
338 START_EXCEPTION(DataTLBError)
339 mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */
340 mtspr SPRN_SPRG_WSCRATCH1, r11
341 mtspr SPRN_SPRG_WSCRATCH2, r12
342 mtspr SPRN_SPRG_WSCRATCH3, r13
344 mtspr SPRN_SPRG_WSCRATCH4, r11
345 mfspr r10, SPRN_DEAR /* Get faulting address */
347 /* If we are faulting a kernel address, we have to use the
348 * kernel page tables.
350 lis r11, PAGE_OFFSET@h
353 lis r11, swapper_pg_dir@h
354 ori r11, r11, swapper_pg_dir@l
356 mfspr r12,SPRN_MAS1 /* Set TID to 0 */
357 rlwinm r12,r12,0,16,1
362 /* Get the PGD for the current thread */
364 mfspr r11,SPRN_SPRG_THREAD
368 /* Mask of required permission bits. Note that while we
369 * do copy ESR:ST to _PAGE_RW position as trying to write
370 * to an RO page is pretty common, we don't do it with
371 * _PAGE_DIRTY. We could do it, but it's a fairly rare
372 * event so I'd rather take the overhead when it happens
373 * rather than adding an instruction here. We should measure
374 * whether the whole thing is worth it in the first place
375 * as we could avoid loading SPRN_ESR completely in the first
378 * TODO: Is it worth doing that mfspr & rlwimi in the first
379 * place or can we save a couple of instructions here ?
382 #ifdef CONFIG_PTE_64BIT
384 oris r13,r13,_PAGE_ACCESSED@h
386 li r13,_PAGE_PRESENT|_PAGE_ACCESSED
388 rlwimi r13,r12,11,29,29
391 andc. r13,r13,r11 /* Check permission */
393 #ifdef CONFIG_PTE_64BIT
395 subf r10,r11,r12 /* create false data dep */
396 lwzx r13,r11,r10 /* Get upper pte bits */
398 lwz r13,0(r12) /* Get upper pte bits */
402 bne 2f /* Bail if permission/valid mismach */
404 /* Jump to common tlb load */
407 /* The bailout. Restore registers to pre-exception conditions
408 * and call the heavyweights to help us out.
410 mfspr r11, SPRN_SPRG_RSCRATCH4
412 mfspr r13, SPRN_SPRG_RSCRATCH3
413 mfspr r12, SPRN_SPRG_RSCRATCH2
414 mfspr r11, SPRN_SPRG_RSCRATCH1
415 mfspr r10, SPRN_SPRG_RSCRATCH0
418 /* Instruction TLB Error Interrupt */
420 * Nearly the same as above, except we get our
421 * information from different registers and bailout
422 * to a different point.
424 START_EXCEPTION(InstructionTLBError)
425 mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */
426 mtspr SPRN_SPRG_WSCRATCH1, r11
427 mtspr SPRN_SPRG_WSCRATCH2, r12
428 mtspr SPRN_SPRG_WSCRATCH3, r13
430 mtspr SPRN_SPRG_WSCRATCH4, r11
431 mfspr r10, SPRN_SRR0 /* Get faulting address */
433 /* If we are faulting a kernel address, we have to use the
434 * kernel page tables.
436 lis r11, PAGE_OFFSET@h
439 lis r11, swapper_pg_dir@h
440 ori r11, r11, swapper_pg_dir@l
442 mfspr r12,SPRN_MAS1 /* Set TID to 0 */
443 rlwinm r12,r12,0,16,1
446 /* Make up the required permissions for kernel code */
447 #ifdef CONFIG_PTE_64BIT
448 li r13,_PAGE_PRESENT | _PAGE_BAP_SX
449 oris r13,r13,_PAGE_ACCESSED@h
451 li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
455 /* Get the PGD for the current thread */
457 mfspr r11,SPRN_SPRG_THREAD
460 /* Make up the required permissions for user code */
461 #ifdef CONFIG_PTE_64BIT
462 li r13,_PAGE_PRESENT | _PAGE_BAP_UX
463 oris r13,r13,_PAGE_ACCESSED@h
465 li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
470 andc. r13,r13,r11 /* Check permission */
472 #ifdef CONFIG_PTE_64BIT
474 subf r10,r11,r12 /* create false data dep */
475 lwzx r13,r11,r10 /* Get upper pte bits */
477 lwz r13,0(r12) /* Get upper pte bits */
481 bne 2f /* Bail if permission mismach */
483 /* Jump to common TLB load point */
487 /* The bailout. Restore registers to pre-exception conditions
488 * and call the heavyweights to help us out.
490 mfspr r11, SPRN_SPRG_RSCRATCH4
492 mfspr r13, SPRN_SPRG_RSCRATCH3
493 mfspr r12, SPRN_SPRG_RSCRATCH2
494 mfspr r11, SPRN_SPRG_RSCRATCH1
495 mfspr r10, SPRN_SPRG_RSCRATCH0
499 /* SPE Unavailable */
500 START_EXCEPTION(SPEUnavailable)
501 NORMAL_EXCEPTION_PROLOG
503 addi r3,r1,STACK_FRAME_OVERHEAD
504 EXC_XFER_EE_LITE(0x2010, KernelSPE)
506 EXCEPTION(0x2020, SPEUnavailable, unknown_exception, EXC_XFER_EE)
507 #endif /* CONFIG_SPE */
509 /* SPE Floating Point Data */
511 EXCEPTION(0x2030, SPEFloatingPointData, SPEFloatingPointException, EXC_XFER_EE);
513 /* SPE Floating Point Round */
514 EXCEPTION(0x2050, SPEFloatingPointRound, SPEFloatingPointRoundException, EXC_XFER_EE)
516 EXCEPTION(0x2040, SPEFloatingPointData, unknown_exception, EXC_XFER_EE)
517 EXCEPTION(0x2050, SPEFloatingPointRound, unknown_exception, EXC_XFER_EE)
518 #endif /* CONFIG_SPE */
520 /* Performance Monitor */
521 EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD)
523 EXCEPTION(0x2070, Doorbell, doorbell_exception, EXC_XFER_STD)
525 CRITICAL_EXCEPTION(0x2080, CriticalDoorbell, unknown_exception)
527 /* Debug Interrupt */
528 DEBUG_DEBUG_EXCEPTION
536 * Both the instruction and data TLB miss get to this
537 * point to load the TLB.
538 * r10 - available to use
539 * r11 - TLB (info from Linux PTE)
540 * r12 - available to use
541 * r13 - upper bits of PTE (if PTE_64BIT) or available to use
542 * CR5 - results of addr >= PAGE_OFFSET
543 * MAS0, MAS1 - loaded with proper value when we get here
544 * MAS2, MAS3 - will need additional info from Linux PTE
545 * Upon exit, we reload everything and RFI.
549 * We set execute, because we don't have the granularity to
550 * properly set this at the page level (Linux problem).
551 * Many of these bits are software only. Bits we don't set
552 * here we (properly should) assume have the appropriate value.
556 #ifdef CONFIG_PTE_64BIT
557 rlwimi r12, r11, 32-19, 27, 31 /* extract WIMGE from pte */
559 rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */
563 #ifdef CONFIG_PTE_64BIT
564 rlwinm r12, r11, 32-2, 26, 31 /* Move in perm bits */
565 andi. r10, r11, _PAGE_DIRTY
567 li r10, MAS3_SW | MAS3_UW
569 1: rlwimi r12, r13, 20, 0, 11 /* grab RPN[32:43] */
570 rlwimi r12, r11, 20, 12, 19 /* grab RPN[44:51] */
572 BEGIN_MMU_FTR_SECTION
573 srwi r10, r13, 12 /* grab RPN[12:31] */
575 END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
577 li r10, (_PAGE_EXEC | _PAGE_PRESENT)
578 rlwimi r10, r11, 31, 29, 29 /* extract _PAGE_DIRTY into SW */
580 andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */
584 rlwimi r11, r12, 0, 20, 31 /* Extract RPN from PTE and merge with perms */
588 /* Round robin TLB1 entries assignment */
591 /* Extract TLB1CFG(NENTRY) */
592 mfspr r11, SPRN_TLB1CFG
593 andi. r11, r11, 0xfff
595 /* Extract MAS0(NV) */
596 andi. r13, r12, 0xfff
601 /* check if we need to wrap */
604 /* wrap back to first free tlbcam entry */
605 lis r13, tlbcam_index@ha
606 lwz r13, tlbcam_index@l(r13)
607 rlwimi r12, r13, 0, 20, 31
610 #endif /* CONFIG_E200 */
614 /* Done...restore registers and get out of here. */
615 mfspr r11, SPRN_SPRG_RSCRATCH4
617 mfspr r13, SPRN_SPRG_RSCRATCH3
618 mfspr r12, SPRN_SPRG_RSCRATCH2
619 mfspr r11, SPRN_SPRG_RSCRATCH1
620 mfspr r10, SPRN_SPRG_RSCRATCH0
621 rfi /* Force context change */
624 /* Note that the SPE support is closely modeled after the AltiVec
625 * support. Changes to one are likely to be applicable to the
629 * Disable SPE for the task which had SPE previously,
630 * and save its SPE registers in its thread_struct.
631 * Enables SPE for use in the kernel on return.
632 * On SMP we know the SPE units are free, since we give it up every
637 mtmsr r5 /* enable use of SPE now */
640 * For SMP, we don't do lazy SPE switching because it just gets too
641 * horrendously complex, especially when a task switches from one CPU
642 * to another. Instead we call giveup_spe in switch_to.
645 lis r3,last_task_used_spe@ha
646 lwz r4,last_task_used_spe@l(r3)
649 addi r4,r4,THREAD /* want THREAD of last_task_used_spe */
650 SAVE_32EVRS(0,r10,r4)
651 evxor evr10, evr10, evr10 /* clear out evr10 */
652 evmwumiaa evr10, evr10, evr10 /* evr10 <- ACC = 0 * 0 + ACC */
654 evstddx evr10, r4, r5 /* save off accumulator */
656 lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
658 andc r4,r4,r10 /* disable SPE for previous task */
659 stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
661 #endif /* !CONFIG_SMP */
662 /* enable use of SPE after return */
664 mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */
667 stw r4,THREAD_USED_SPE(r5)
670 REST_32EVRS(0,r10,r5)
673 stw r4,last_task_used_spe@l(r3)
674 #endif /* !CONFIG_SMP */
675 /* restore registers and return */
676 2: REST_4GPRS(3, r11)
691 * SPE unavailable trap from kernel - print a message, but let
692 * the task use SPE in the kernel until it returns to user mode.
697 stw r3,_MSR(r1) /* enable use of SPE after return */
701 mr r4,r2 /* current */
707 87: .string "SPE used in kernel (task=%p, pc=%x) \n"
711 #endif /* CONFIG_SPE */
717 /* Adjust or setup IVORs for e200 */
718 _GLOBAL(__setup_e200_ivors)
721 li r3,SPEUnavailable@l
723 li r3,SPEFloatingPointData@l
725 li r3,SPEFloatingPointRound@l
730 /* Adjust or setup IVORs for e500v1/v2 */
731 _GLOBAL(__setup_e500_ivors)
734 li r3,SPEUnavailable@l
736 li r3,SPEFloatingPointData@l
738 li r3,SPEFloatingPointRound@l
740 li r3,PerformanceMonitor@l
745 /* Adjust or setup IVORs for e500mc */
746 _GLOBAL(__setup_e500mc_ivors)
749 li r3,PerformanceMonitor@l
753 li r3,CriticalDoorbell@l
759 * extern void giveup_altivec(struct task_struct *prev)
761 * The e500 core does not have an AltiVec unit.
763 _GLOBAL(giveup_altivec)
768 * extern void giveup_spe(struct task_struct *prev)
774 mtmsr r5 /* enable use of SPE now */
777 beqlr- /* if no previous owner, done */
778 addi r3,r3,THREAD /* want THREAD of task */
781 SAVE_32EVRS(0, r4, r3)
782 evxor evr6, evr6, evr6 /* clear out evr6 */
783 evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */
785 evstddx evr6, r4, r3 /* save off accumulator */
786 mfspr r6,SPRN_SPEFSCR
787 stw r6,THREAD_SPEFSCR(r3) /* save spefscr register value */
789 lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5)
791 andc r4,r4,r3 /* disable SPE for previous task */
792 stw r4,_MSR-STACK_FRAME_OVERHEAD(r5)
796 lis r4,last_task_used_spe@ha
797 stw r5,last_task_used_spe@l(r4)
798 #endif /* !CONFIG_SMP */
800 #endif /* CONFIG_SPE */
803 * extern void giveup_fpu(struct task_struct *prev)
805 * Not all FSL Book-E cores have an FPU
807 #ifndef CONFIG_PPC_FPU
813 * extern void abort(void)
815 * At present, this routine just applies a system reset.
819 mtspr SPRN_DBCR0,r13 /* disable all debug events */
822 ori r13,r13,MSR_DE@l /* Enable Debug Events */
826 lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h
832 #ifdef CONFIG_BDI_SWITCH
833 /* Context switch the PTE pointer for the Abatron BDI2000.
834 * The PGDIR is the second parameter.
836 lis r5, abatron_pteptrs@h
837 ori r5, r5, abatron_pteptrs@l
841 isync /* Force context change */
844 _GLOBAL(flush_dcache_L1)
847 rlwinm r5,r3,9,3 /* Extract cache block size */
848 twlgti r5,1 /* Only 32 and 64 byte cache blocks
849 * are currently defined.
852 subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) -
853 * log2(number of ways)
855 slw r5,r4,r5 /* r5 = cache block size */
857 rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */
858 mulli r7,r7,13 /* An 8-way cache will require 13
863 /* save off HID0 and set DCFA */
865 ori r9,r8,HID0_DCFA@l
872 1: lwz r3,0(r4) /* Load... */
880 1: dcbf 0,r4 /* ...and flush. */
891 /* When we get here, r24 needs to hold the CPU # */
892 .globl __secondary_start
894 lis r3,__secondary_hold_acknowledge@h
895 ori r3,r3,__secondary_hold_acknowledge@l
902 lis r3,tlbcam_index@ha
903 lwz r3,tlbcam_index@l(r3)
905 li r26,0 /* r26 safe? */
907 /* Load each CAM entry */
913 /* get current_thread_info and current */
914 lis r1,secondary_ti@ha
915 lwz r1,secondary_ti@l(r1)
919 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
923 /* ptr to current thread */
924 addi r4,r2,THREAD /* address of our thread_struct */
925 mtspr SPRN_SPRG_THREAD,r4
927 /* Setup the defaults for TLB entries */
928 li r4,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l
931 /* Jump to start_secondary */
933 ori r4,r4,MSR_KERNEL@l
934 lis r3,start_secondary@h
935 ori r3,r3,start_secondary@l
942 .globl __secondary_hold_acknowledge
943 __secondary_hold_acknowledge:
948 * We put a few things here that have to be page-aligned. This stuff
949 * goes at the beginning of the data segment, which is page-aligned.
955 .globl empty_zero_page
958 .globl swapper_pg_dir
960 .space PGD_TABLE_SIZE
963 * Room for two PTE pointers, usually the kernel and current user pointers
964 * to their respective root page table.