1 /* SPDX-License-Identifier: GPL-2.0-or-later */
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
6 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
7 * Low-level exception handlers and MMU support
8 * rewritten by Paul Mackerras.
9 * Copyright (C) 1996 Paul Mackerras.
10 * MPC8xx modifications by Dan Malek
11 * Copyright (C) 1997 Dan Malek (dmalek@jlc.net).
13 * This file contains low-level support and setup for PowerPC 8xx
14 * embedded processors, including trap and interrupt dispatch.
17 #include <linux/init.h>
18 #include <linux/magic.h>
19 #include <linux/pgtable.h>
20 #include <linux/sizes.h>
21 #include <asm/processor.h>
24 #include <asm/cache.h>
25 #include <asm/cputable.h>
26 #include <asm/thread_info.h>
27 #include <asm/ppc_asm.h>
28 #include <asm/asm-offsets.h>
29 #include <asm/ptrace.h>
30 #include <asm/export.h>
31 #include <asm/code-patching-asm.h>
34 * Value for the bits that have fixed value in RPN entries.
35 * Also used for tagging DAR for DTLBerror.
37 #define RPN_PATTERN 0x00f0
41 .macro compare_to_kernel_boundary scratch, addr
42 #if CONFIG_TASK_SIZE <= 0x80000000 && CONFIG_PAGE_OFFSET >= 0x80000000
43 /* By simply checking Address >= 0x80000000, we know if its a kernel address */
46 rlwinm \scratch, \addr, 16, 0xfff8
47 cmpli cr0, \scratch, PAGE_OFFSET@h
51 #define PAGE_SHIFT_512K 19
52 #define PAGE_SHIFT_8M 23
59 * This port was done on an MBX board with an 860. Right now I only
60 * support an ELF compressed (zImage) boot from EPPC-Bug because the
61 * code there loads up some registers before calling us:
62 * r3: ptr to board info data
63 * r4: initrd_start or if no initrd then 0
64 * r5: initrd_end - unused if r4 is 0
65 * r6: Start of command line string
66 * r7: End of command line string
68 * I decided to use conditional compilation instead of checking PVR and
69 * adding more processor specific branches around code I don't need.
70 * Since this is an embedded processor, I also appreciate any memory
73 * The MPC8xx does not have any BATs, but it supports large page sizes.
74 * We first initialize the MMU to support 8M byte pages, then load one
75 * entry into each of the instruction and data TLBs to map the first
76 * 8M 1:1. I also mapped an additional I/O space 1:1 so we can get to
77 * the "internal" processor registers before MMU_init is called.
83 mr r31,r3 /* save device tree ptr */
85 /* We have to turn on the MMU right away so we get cache modes
90 /* We now have the lower 8 Meg mapped into TLB entries, and the caches
96 ori r0,r0,MSR_DR|MSR_IR
99 ori r0,r0,start_here@l
101 rfi /* enables MMU */
104 #ifdef CONFIG_PERF_EVENTS
107 .globl itlb_miss_counter
111 .globl dtlb_miss_counter
115 .globl instruction_counter
121 EXCEPTION(0x100, Reset, system_reset_exception)
124 START_EXCEPTION(0x200, MachineCheck)
125 EXCEPTION_PROLOG 0x200 MachineCheck handle_dar_dsisr=1
126 prepare_transfer_to_handler
127 bl machine_check_exception
130 /* External interrupt */
131 EXCEPTION(0x500, HardwareInterrupt, do_IRQ)
133 /* Alignment exception */
134 START_EXCEPTION(0x600, Alignment)
135 EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1
136 prepare_transfer_to_handler
137 bl alignment_exception
141 /* Program check exception */
142 START_EXCEPTION(0x700, ProgramCheck)
143 EXCEPTION_PROLOG 0x700 ProgramCheck
144 prepare_transfer_to_handler
145 bl program_check_exception
150 EXCEPTION(0x900, Decrementer, timer_interrupt)
153 START_EXCEPTION(0xc00, SystemCall)
156 /* Single step - not used on 601 */
157 EXCEPTION(0xd00, SingleStep, single_step_exception)
159 /* On the MPC8xx, this is a software emulation interrupt. It occurs
160 * for all unimplemented and illegal instructions.
162 START_EXCEPTION(0x1000, SoftEmu)
163 EXCEPTION_PROLOG 0x1000 SoftEmu
164 prepare_transfer_to_handler
165 bl emulation_assist_interrupt
170 * For the MPC8xx, this is a software tablewalk to load the instruction
171 * TLB. The task switch loads the M_TWB register with the pointer to the first
173 * If we discover there is no second level table (value is zero) or if there
174 * is an invalid pte, we load that into the TLB, which causes another fault
175 * into the TLB Error interrupt where we can handle such problems.
176 * We have to use the MD_xxx registers for the tablewalk because the
177 * equivalent MI_xxx registers only perform the attribute functions.
180 #ifdef CONFIG_8xx_CPU15
181 #define INVALIDATE_ADJACENT_PAGES_CPU15(addr, tmp) \
182 addi tmp, addr, PAGE_SIZE; \
184 addi tmp, addr, -PAGE_SIZE; \
187 #define INVALIDATE_ADJACENT_PAGES_CPU15(addr, tmp)
190 START_EXCEPTION(0x1100, InstructionTLBMiss)
191 mtspr SPRN_SPRG_SCRATCH2, r10
194 /* If we are faulting a kernel address, we have to use the
195 * kernel page tables.
197 mfspr r10, SPRN_SRR0 /* Get effective address of fault */
198 INVALIDATE_ADJACENT_PAGES_CPU15(r10, r11)
199 mtspr SPRN_MD_EPN, r10
200 #ifdef CONFIG_MODULES
202 compare_to_kernel_boundary r10, r10
204 mfspr r10, SPRN_M_TWB /* Get level 1 table */
205 #ifdef CONFIG_MODULES
207 rlwinm r10, r10, 0, 20, 31
208 oris r10, r10, (swapper_pg_dir - PAGE_OFFSET)@ha
212 lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r10) /* Get level 1 entry */
213 mtspr SPRN_MD_TWC, r11
214 mfspr r10, SPRN_MD_TWC
215 lwz r10, 0(r10) /* Get the pte */
216 rlwimi r11, r10, 0, _PAGE_GUARDED | _PAGE_ACCESSED
217 rlwimi r11, r10, 32 - 9, _PMD_PAGE_512K
218 mtspr SPRN_MI_TWC, r11
219 /* The Linux PTE won't go exactly into the MMU TLB.
220 * Software indicator bits 20 and 23 must be clear.
221 * Software indicator bits 22, 24, 25, 26, and 27 must be
222 * set. All other Linux PTE bits control the behavior
225 rlwinm r10, r10, 0, ~0x0f00 /* Clear bits 20-23 */
226 rlwimi r10, r10, 4, 0x0400 /* Copy _PAGE_EXEC into bit 21 */
227 ori r10, r10, RPN_PATTERN | 0x200 /* Set 22 and 24-27 */
228 mtspr SPRN_MI_RPN, r10 /* Update TLB entry */
230 /* Restore registers */
231 0: mfspr r10, SPRN_SPRG_SCRATCH2
234 patch_site 0b, patch__itlbmiss_exit_1
236 #ifdef CONFIG_PERF_EVENTS
237 patch_site 0f, patch__itlbmiss_perf
238 0: lwz r10, (itlb_miss_counter - PAGE_OFFSET)@l(0)
240 stw r10, (itlb_miss_counter - PAGE_OFFSET)@l(0)
241 mfspr r10, SPRN_SPRG_SCRATCH2
246 START_EXCEPTION(0x1200, DataStoreTLBMiss)
247 mtspr SPRN_SPRG_SCRATCH2, r10
251 /* If we are faulting a kernel address, we have to use the
252 * kernel page tables.
254 mfspr r10, SPRN_MD_EPN
255 compare_to_kernel_boundary r10, r10
256 mfspr r10, SPRN_M_TWB /* Get level 1 table */
258 rlwinm r10, r10, 0, 20, 31
259 oris r10, r10, (swapper_pg_dir - PAGE_OFFSET)@ha
262 lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r10) /* Get level 1 entry */
264 mtspr SPRN_MD_TWC, r11
265 mfspr r10, SPRN_MD_TWC
266 lwz r10, 0(r10) /* Get the pte */
268 /* Insert Guarded and Accessed flags into the TWC from the Linux PTE.
269 * It is bit 27 of both the Linux PTE and the TWC (at least
270 * I got that right :-). It will be better when we can put
271 * this into the Linux pgd/pmd and load it in the operation
274 rlwimi r11, r10, 0, _PAGE_GUARDED | _PAGE_ACCESSED
275 rlwimi r11, r10, 32 - 9, _PMD_PAGE_512K
276 mtspr SPRN_MD_TWC, r11
278 /* The Linux PTE won't go exactly into the MMU TLB.
279 * Software indicator bits 24, 25, 26, and 27 must be
280 * set. All other Linux PTE bits control the behavior
284 rlwimi r10, r11, 0, 24, 27 /* Set 24-27 */
285 mtspr SPRN_MD_RPN, r10 /* Update TLB entry */
286 mtspr SPRN_DAR, r11 /* Tag DAR */
288 /* Restore registers */
290 0: mfspr r10, SPRN_SPRG_SCRATCH2
293 patch_site 0b, patch__dtlbmiss_exit_1
295 #ifdef CONFIG_PERF_EVENTS
296 patch_site 0f, patch__dtlbmiss_perf
297 0: lwz r10, (dtlb_miss_counter - PAGE_OFFSET)@l(0)
299 stw r10, (dtlb_miss_counter - PAGE_OFFSET)@l(0)
300 mfspr r10, SPRN_SPRG_SCRATCH2
305 /* This is an instruction TLB error on the MPC8xx. This could be due
306 * to many reasons, such as executing guarded memory or illegal instruction
307 * addresses. There is nothing to do but handle a big time error fault.
309 START_EXCEPTION(0x1300, InstructionTLBError)
310 /* 0x400 is InstructionAccess exception, needed by bad_page_fault() */
311 EXCEPTION_PROLOG 0x400 InstructionTLBError
312 andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
313 andis. r10,r9,SRR1_ISI_NOPT@h
319 prepare_transfer_to_handler
323 /* This is the data TLB error on the MPC8xx. This could be due to
324 * many reasons, including a dirty update to a pte. We bail out to
325 * a higher level function that can handle it.
327 START_EXCEPTION(0x1400, DataTLBError)
328 EXCEPTION_PROLOG_0 handle_dar_dsisr=1
330 cmpwi cr1, r11, RPN_PATTERN
331 beq- cr1, FixupDAR /* must be a buggy dcbX, icbi insn. */
332 DARFixed:/* Return from dcbx instruction bug workaround */
334 /* 0x300 is DataAccess exception, needed by bad_page_fault() */
335 EXCEPTION_PROLOG_2 0x300 DataTLBError handle_dar_dsisr=1
338 andis. r10,r5,DSISR_NOHPTE@h
342 prepare_transfer_to_handler
346 #ifdef CONFIG_VMAP_STACK
347 vmap_stack_overflow_exception
350 /* On the MPC8xx, these next four traps are used for development
351 * support of breakpoints and such. Someday I will get around to
354 START_EXCEPTION(0x1c00, DataBreakpoint)
355 EXCEPTION_PROLOG_0 handle_dar_dsisr=1
357 cmplwi cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l
358 cmplwi cr7, r11, (.Litlbie - PAGE_OFFSET)@l
359 cror 4*cr1+eq, 4*cr1+eq, 4*cr7+eq
362 mfspr r10, SPRN_SPRG_SCRATCH0
363 mfspr r11, SPRN_SPRG_SCRATCH1
366 1: EXCEPTION_PROLOG_1
367 EXCEPTION_PROLOG_2 0x1c00 DataBreakpoint handle_dar_dsisr=1
370 prepare_transfer_to_handler
375 #ifdef CONFIG_PERF_EVENTS
376 START_EXCEPTION(0x1d00, InstructionBreakpoint)
377 mtspr SPRN_SPRG_SCRATCH0, r10
378 lwz r10, (instruction_counter - PAGE_OFFSET)@l(0)
380 stw r10, (instruction_counter - PAGE_OFFSET)@l(0)
383 mtspr SPRN_COUNTA, r10
384 mfspr r10, SPRN_SPRG_SCRATCH0
387 EXCEPTION(0x1d00, Trap_1d, unknown_exception)
389 EXCEPTION(0x1e00, Trap_1e, unknown_exception)
390 EXCEPTION(0x1f00, Trap_1f, unknown_exception)
395 /* This is the procedure to calculate the data EA for buggy dcbx,dcbi instructions
396 * by decoding the registers used by the dcbx instruction and adding them.
397 * DAR is set to the calculated address.
399 FixupDAR:/* Entry point for dcbx workaround. */
401 /* fetch instruction from memory. */
403 mtspr SPRN_MD_EPN, r10
404 rlwinm r11, r10, 16, 0xfff8
405 cmpli cr1, r11, PAGE_OFFSET@h
406 mfspr r11, SPRN_M_TWB /* Get level 1 table */
409 /* create physical page address from effective address */
411 mfspr r11, SPRN_M_TWB /* Get level 1 table */
412 rlwinm r11, r11, 0, 20, 31
413 oris r11, r11, (swapper_pg_dir - PAGE_OFFSET)@ha
415 lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
416 mtspr SPRN_MD_TWC, r11
418 mfspr r11, SPRN_MD_TWC
419 lwz r11, 0(r11) /* Get the pte */
420 bt 28,200f /* bit 28 = Large page (8M) */
421 /* concat physical page address(r11) and page offset(r10) */
422 rlwimi r11, r10, 0, 32 - PAGE_SHIFT, 31
424 /* Check if it really is a dcbx instruction. */
425 /* dcbt and dcbtst does not generate DTLB Misses/Errors,
426 * no need to include them here */
427 xoris r10, r11, 0x7c00 /* check if major OP code is 31 */
428 rlwinm r10, r10, 0, 21, 5
429 cmpwi cr1, r10, 2028 /* Is dcbz? */
431 cmpwi cr1, r10, 940 /* Is dcbi? */
433 cmpwi cr1, r10, 108 /* Is dcbst? */
434 beq+ cr1, 144f /* Fix up store bit! */
435 cmpwi cr1, r10, 172 /* Is dcbf? */
437 cmpwi cr1, r10, 1964 /* Is icbi? */
439 141: mfspr r10,SPRN_M_TW
440 b DARFixed /* Nope, go back to normal TLB processing */
443 /* concat physical page address(r11) and page offset(r10) */
444 rlwimi r11, r10, 0, 32 - PAGE_SHIFT_8M, 31
447 144: mfspr r10, SPRN_DSISR
448 rlwinm r10, r10,0,7,5 /* Clear store bit for buggy dcbst insn */
449 mtspr SPRN_DSISR, r10
450 142: /* continue, it was a dcbx, dcbi instruction. */
452 mtdar r10 /* save ctr reg in DAR */
453 rlwinm r10, r11, 24, 24, 28 /* offset into jump table for reg RB */
454 addi r10, r10, 150f@l /* add start of table */
455 mtctr r10 /* load ctr with jump address */
456 xor r10, r10, r10 /* sum starts at zero */
457 bctr /* jump into table */
459 add r10, r10, r0 ;b 151f
460 add r10, r10, r1 ;b 151f
461 add r10, r10, r2 ;b 151f
462 add r10, r10, r3 ;b 151f
463 add r10, r10, r4 ;b 151f
464 add r10, r10, r5 ;b 151f
465 add r10, r10, r6 ;b 151f
466 add r10, r10, r7 ;b 151f
467 add r10, r10, r8 ;b 151f
468 add r10, r10, r9 ;b 151f
469 mtctr r11 ;b 154f /* r10 needs special handling */
470 mtctr r11 ;b 153f /* r11 needs special handling */
471 add r10, r10, r12 ;b 151f
472 add r10, r10, r13 ;b 151f
473 add r10, r10, r14 ;b 151f
474 add r10, r10, r15 ;b 151f
475 add r10, r10, r16 ;b 151f
476 add r10, r10, r17 ;b 151f
477 add r10, r10, r18 ;b 151f
478 add r10, r10, r19 ;b 151f
479 add r10, r10, r20 ;b 151f
480 add r10, r10, r21 ;b 151f
481 add r10, r10, r22 ;b 151f
482 add r10, r10, r23 ;b 151f
483 add r10, r10, r24 ;b 151f
484 add r10, r10, r25 ;b 151f
485 add r10, r10, r26 ;b 151f
486 add r10, r10, r27 ;b 151f
487 add r10, r10, r28 ;b 151f
488 add r10, r10, r29 ;b 151f
489 add r10, r10, r30 ;b 151f
492 rlwinm r11,r11,19,24,28 /* offset into jump table for reg RA */
494 beq cr1, 152f /* if reg RA is zero, don't add it */
495 addi r11, r11, 150b@l /* add start of table */
496 mtctr r11 /* load ctr with jump address */
497 rlwinm r11,r11,0,16,10 /* make sure we don't execute this more than once */
498 bctr /* jump into table */
501 mtctr r11 /* restore ctr reg from DAR */
502 mfspr r11, SPRN_SPRG_THREAD
504 mfspr r10, SPRN_DSISR
507 b DARFixed /* Go back to normal TLB handling */
509 /* special handling for r10,r11 since these are modified already */
510 153: mfspr r11, SPRN_SPRG_SCRATCH1 /* load r11 from SPRN_SPRG_SCRATCH1 */
511 add r10, r10, r11 /* add it */
512 mfctr r11 /* restore r11 */
514 154: mfspr r11, SPRN_SPRG_SCRATCH0 /* load r10 from SPRN_SPRG_SCRATCH0 */
515 add r10, r10, r11 /* add it */
516 mfctr r11 /* restore r11 */
520 * This is where the main kernel code starts.
525 ori r2,r2,init_task@l
527 /* ptr to phys current thread */
529 addi r4,r4,THREAD /* init task's THREAD */
530 mtspr SPRN_SPRG_THREAD,r4
533 lis r1,init_thread_union@ha
534 addi r1,r1,init_thread_union@l
535 lis r0, STACK_END_MAGIC@h
536 ori r0, r0, STACK_END_MAGIC@l
539 stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
541 lis r6, swapper_pg_dir@ha
545 bl early_init /* We have to do this with MMU on */
548 * Decide what sort of machine this is and initialize the MMU.
559 * Go back to running unmapped so we can load up new values
560 * and change to using our exception vectors.
561 * On the 8xx, all we have to do is invalidate the TLB to clear
562 * the old 8M byte TLB mappings and load the page table base register.
564 /* The right way to do this would be to track it down through
565 * init's THREAD like the context switch code does, but this is
566 * easier......until someone changes init's static structures.
571 li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR)
575 /* Load up the kernel context */
577 #ifdef CONFIG_PIN_TLB_IMMR
580 mtspr SPRN_MD_CTR, r0
581 LOAD_REG_IMMEDIATE(r0, VIRT_IMMR_BASE | MD_EVALID)
583 mtspr SPRN_MD_EPN, r0
584 LOAD_REG_IMMEDIATE(r0, MD_SVALID | MD_PS512K | MD_GUARDED)
585 mtspr SPRN_MD_TWC, r0
587 rlwinm r0, r0, 0, 0xfff80000
588 ori r0, r0, 0xf0 | _PAGE_DIRTY | _PAGE_SPS | _PAGE_SH | \
589 _PAGE_NO_CACHE | _PAGE_PRESENT
590 mtspr SPRN_MD_RPN, r0
591 lis r0, (MD_TWAM | MD_RSV4I)@h
592 mtspr SPRN_MD_CTR, r0
594 #if !defined(CONFIG_PIN_TLB_DATA) && !defined(CONFIG_PIN_TLB_IMMR)
596 mtspr SPRN_MD_CTR, r0
598 tlbia /* Clear all TLB entries */
599 sync /* wait for tlbia/tlbie to finish */
601 /* set up the PTE pointers for the Abatron bdiGDB.
603 lis r5, abatron_pteptrs@h
604 ori r5, r5, abatron_pteptrs@l
605 stw r5, 0xf0(0) /* Must match your Abatron config file */
607 lis r6, swapper_pg_dir@h
608 ori r6, r6, swapper_pg_dir@l
611 /* Now turn on the MMU for real! */
613 lis r3,start_kernel@h
614 ori r3,r3,start_kernel@l
617 rfi /* enable MMU and jump to start_kernel */
619 /* Set up the initial MMU state so we can do the first level of
620 * kernel initialization. This maps the first 8 MBytes of memory 1:1
621 * virtual to physical. Also, set the cache mode since that is defined
622 * by TLB entries and perform any additional mapping (like of the IMMR).
623 * If configured to pin some TLBs, we pin the first 8 Mbytes of kernel,
624 * 24 Mbytes of data, and the 512k IMMR space. Anything not covered by
625 * these mappings is mapped by page tables.
629 mtspr SPRN_MI_CTR, r8 /* remove PINNED ITLB entries */
631 mtspr SPRN_MD_CTR, r10 /* remove PINNED DTLB entries */
633 tlbia /* Invalidate all TLB entries */
635 lis r8, MI_APG_INIT@h /* Set protection modes */
636 ori r8, r8, MI_APG_INIT@l
638 lis r8, MD_APG_INIT@h
639 ori r8, r8, MD_APG_INIT@l
642 /* Map the lower RAM (up to 32 Mbytes) into the ITLB and DTLB */
645 oris r12, r10, MD_RSV4I@h
647 li r9, 4 /* up to 4 pages of 8M */
649 lis r9, KERNELBASE@h /* Create vaddr for TLB */
650 li r10, MI_PS8MEG | _PMD_ACCESSED | MI_SVALID
651 li r11, MI_BOOTINIT /* Create RPN for address 0 */
653 mtspr SPRN_MI_CTR, r8 /* Set instruction MMU control */
655 ori r0, r9, MI_EVALID /* Mark it valid */
656 mtspr SPRN_MI_EPN, r0
657 mtspr SPRN_MI_TWC, r10
658 mtspr SPRN_MI_RPN, r11 /* Store TLB entry */
659 mtspr SPRN_MD_CTR, r12
661 mtspr SPRN_MD_EPN, r0
662 mtspr SPRN_MD_TWC, r10
663 mtspr SPRN_MD_RPN, r11
669 /* Since the cache is enabled according to the information we
670 * just loaded into the TLB, invalidate and enable the caches here.
671 * We should probably check/set other modes....later.
674 mtspr SPRN_IC_CST, r8
675 mtspr SPRN_DC_CST, r8
677 mtspr SPRN_IC_CST, r8
678 mtspr SPRN_DC_CST, r8
679 /* Disable debug mode entry on breakpoints */
681 #ifdef CONFIG_PERF_EVENTS
682 rlwinm r8, r8, 0, ~0xc
684 rlwinm r8, r8, 0, ~0x8
690 lis r9, (1f - PAGE_OFFSET)@h
691 ori r9, r9, (1f - PAGE_OFFSET)@l
694 li r12, MSR_KERNEL & ~(MSR_IR | MSR_DR | MSR_RI)
695 rlwinm r0, r10, 0, ~MSR_RI
696 rlwinm r0, r0, 0, ~MSR_EE
706 mtspr SPRN_MI_CTR, r5
707 mtspr SPRN_MD_CTR, r6
710 LOAD_REG_IMMEDIATE(r5, 28 << 8)
711 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET)
712 LOAD_REG_IMMEDIATE(r7, MI_SVALID | MI_PS8MEG | _PMD_ACCESSED)
713 LOAD_REG_IMMEDIATE(r8, 0xf0 | _PAGE_RO | _PAGE_SPS | _PAGE_SH | _PAGE_PRESENT)
714 LOAD_REG_ADDR(r9, _sinittext)
718 2: ori r0, r6, MI_EVALID
719 mtspr SPRN_MI_CTR, r5
720 mtspr SPRN_MI_EPN, r0
721 mtspr SPRN_MI_TWC, r7
722 mtspr SPRN_MI_RPN, r8
724 addis r6, r6, SZ_8M@h
725 addis r8, r8, SZ_8M@h
729 mtspr SPRN_MI_CTR, r0
731 LOAD_REG_IMMEDIATE(r5, 28 << 8 | MD_TWAM)
732 #ifdef CONFIG_PIN_TLB_DATA
733 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET)
734 LOAD_REG_IMMEDIATE(r7, MI_SVALID | MI_PS8MEG | _PMD_ACCESSED)
735 #ifdef CONFIG_PIN_TLB_IMMR
743 LOAD_REG_IMMEDIATE(r8, 0xf0 | _PAGE_RO | _PAGE_SPS | _PAGE_SH | _PAGE_PRESENT)
744 LOAD_REG_ADDR(r9, _sinittext)
746 2: ori r0, r6, MD_EVALID
747 mtspr SPRN_MD_CTR, r5
748 mtspr SPRN_MD_EPN, r0
749 mtspr SPRN_MD_TWC, r7
750 mtspr SPRN_MD_RPN, r8
752 addis r6, r6, SZ_8M@h
753 addis r8, r8, SZ_8M@h
757 4: LOAD_REG_IMMEDIATE(r8, 0xf0 | _PAGE_SPS | _PAGE_SH | _PAGE_PRESENT)
758 2: ori r0, r6, MD_EVALID
759 mtspr SPRN_MD_CTR, r5
760 mtspr SPRN_MD_EPN, r0
761 mtspr SPRN_MD_TWC, r7
762 mtspr SPRN_MD_RPN, r8
764 addis r6, r6, SZ_8M@h
765 addis r8, r8, SZ_8M@h
769 #ifdef CONFIG_PIN_TLB_IMMR
770 LOAD_REG_IMMEDIATE(r0, VIRT_IMMR_BASE | MD_EVALID)
771 LOAD_REG_IMMEDIATE(r7, MD_SVALID | MD_PS512K | MD_GUARDED | _PMD_ACCESSED)
773 rlwinm r8, r8, 0, 0xfff80000
774 ori r8, r8, 0xf0 | _PAGE_DIRTY | _PAGE_SPS | _PAGE_SH | \
775 _PAGE_NO_CACHE | _PAGE_PRESENT
776 mtspr SPRN_MD_CTR, r5
777 mtspr SPRN_MD_EPN, r0
778 mtspr SPRN_MD_TWC, r7
779 mtspr SPRN_MD_RPN, r8
781 #if defined(CONFIG_PIN_TLB_IMMR) || defined(CONFIG_PIN_TLB_DATA)
782 lis r0, (MD_RSV4I | MD_TWAM)@h
783 mtspr SPRN_MI_CTR, r0
790 * We put a few things here that have to be page-aligned.
791 * This stuff goes at the beginning of the data segment,
792 * which is page-aligned.
797 .globl empty_zero_page
801 EXPORT_SYMBOL(empty_zero_page)
803 .globl swapper_pg_dir
805 .space PGD_TABLE_SIZE
807 /* Room for two PTE table pointers, usually the kernel and current user
808 * pointer to their respective root page table (pgdir).
810 .globl abatron_pteptrs