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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * File: mca_asm.S
4 * Purpose: assembly portion of the IA64 MCA handling
5 *
6 * Mods by cfleck to integrate into kernel build
7 *
8 * 2000-03-15 David Mosberger-Tang <davidm@hpl.hp.com>
9 * Added various stop bits to get a clean compile
10 *
11 * 2000-03-29 Chuck Fleckenstein <cfleck@co.intel.com>
12 * Added code to save INIT handoff state in pt_regs format,
13 * switch to temp kstack, switch modes, jump to C INIT handler
14 *
15 * 2002-01-04 J.Hall <jenna.s.hall@intel.com>
16 * Before entering virtual mode code:
17 * 1. Check for TLB CPU error
18 * 2. Restore current thread pointer to kr6
19 * 3. Move stack ptr 16 bytes to conform to C calling convention
20 *
21 * 2004-11-12 Russ Anderson <rja@sgi.com>
22 * Added per cpu MCA/INIT stack save areas.
23 *
24 * 2005-12-08 Keith Owens <kaos@sgi.com>
25 * Use per cpu MCA/INIT stacks for all data.
26 */
27#include <linux/threads.h>
28#include <linux/pgtable.h>
29
30#include <asm/asmmacro.h>
31#include <asm/processor.h>
32#include <asm/mca_asm.h>
33#include <asm/mca.h>
34
35#include "entry.h"
36
37#define GET_IA64_MCA_DATA(reg) \
38 GET_THIS_PADDR(reg, ia64_mca_data) \
39 ;; \
40 ld8 reg=[reg]
41
42 .global ia64_do_tlb_purge
43 .global ia64_os_mca_dispatch
44 .global ia64_os_init_on_kdump
45 .global ia64_os_init_dispatch_monarch
46 .global ia64_os_init_dispatch_slave
47
48 .text
49 .align 16
50
51//StartMain////////////////////////////////////////////////////////////////////
52
53/*
54 * Just the TLB purge part is moved to a separate function
55 * so we can re-use the code for cpu hotplug code as well
56 * Caller should now setup b1, so we can branch once the
57 * tlb flush is complete.
58 */
59
60ia64_do_tlb_purge:
61#define O(member) IA64_CPUINFO_##member##_OFFSET
62
63 GET_THIS_PADDR(r2, ia64_cpu_info) // load phys addr of cpu_info into r2
64 ;;
65 addl r17=O(PTCE_STRIDE),r2
66 addl r2=O(PTCE_BASE),r2
67 ;;
68 ld8 r18=[r2],(O(PTCE_COUNT)-O(PTCE_BASE));; // r18=ptce_base
69 ld4 r19=[r2],4 // r19=ptce_count[0]
70 ld4 r21=[r17],4 // r21=ptce_stride[0]
71 ;;
72 ld4 r20=[r2] // r20=ptce_count[1]
73 ld4 r22=[r17] // r22=ptce_stride[1]
74 mov r24=0
75 ;;
76 adds r20=-1,r20
77 ;;
78#undef O
79
802:
81 cmp.ltu p6,p7=r24,r19
82(p7) br.cond.dpnt.few 4f
83 mov ar.lc=r20
843:
85 ptc.e r18
86 ;;
87 add r18=r22,r18
88 br.cloop.sptk.few 3b
89 ;;
90 add r18=r21,r18
91 add r24=1,r24
92 ;;
93 br.sptk.few 2b
944:
95 srlz.i // srlz.i implies srlz.d
96 ;;
97
98 // Now purge addresses formerly mapped by TR registers
99 // 1. Purge ITR&DTR for kernel.
100 movl r16=KERNEL_START
101 mov r18=KERNEL_TR_PAGE_SHIFT<<2
102 ;;
103 ptr.i r16, r18
104 ptr.d r16, r18
105 ;;
106 srlz.i
107 ;;
108 srlz.d
109 ;;
110 // 3. Purge ITR for PAL code.
111 GET_THIS_PADDR(r2, ia64_mca_pal_base)
112 ;;
113 ld8 r16=[r2]
114 mov r18=IA64_GRANULE_SHIFT<<2
115 ;;
116 ptr.i r16,r18
117 ;;
118 srlz.i
119 ;;
120 // 4. Purge DTR for stack.
121 mov r16=IA64_KR(CURRENT_STACK)
122 ;;
123 shl r16=r16,IA64_GRANULE_SHIFT
124 movl r19=PAGE_OFFSET
125 ;;
126 add r16=r19,r16
127 mov r18=IA64_GRANULE_SHIFT<<2
128 ;;
129 ptr.d r16,r18
130 ;;
131 srlz.i
132 ;;
133 // Now branch away to caller.
134 br.sptk.many b1
135 ;;
136
137//EndMain//////////////////////////////////////////////////////////////////////
138
139//StartMain////////////////////////////////////////////////////////////////////
140
141ia64_os_mca_dispatch:
142 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
143 LOAD_PHYSICAL(p0,r2,1f) // return address
144 mov r19=1 // All MCA events are treated as monarch (for now)
145 br.sptk ia64_state_save // save the state that is not in minstate
1461:
147
148 GET_IA64_MCA_DATA(r2)
149 // Using MCA stack, struct ia64_sal_os_state, variable proc_state_param
150 ;;
151 add r3=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET+SOS(PROC_STATE_PARAM), r2
152 ;;
153 ld8 r18=[r3] // Get processor state parameter on existing PALE_CHECK.
154 ;;
155 tbit.nz p6,p7=r18,60
156(p7) br.spnt done_tlb_purge_and_reload
157
158 // The following code purges TC and TR entries. Then reload all TC entries.
159 // Purge percpu data TC entries.
160begin_tlb_purge_and_reload:
161 movl r18=ia64_reload_tr;;
162 LOAD_PHYSICAL(p0,r18,ia64_reload_tr);;
163 mov b1=r18;;
164 br.sptk.many ia64_do_tlb_purge;;
165
166ia64_reload_tr:
167 // Finally reload the TR registers.
168 // 1. Reload DTR/ITR registers for kernel.
169 mov r18=KERNEL_TR_PAGE_SHIFT<<2
170 movl r17=KERNEL_START
171 ;;
172 mov cr.itir=r18
173 mov cr.ifa=r17
174 mov r16=IA64_TR_KERNEL
175 mov r19=ip
176 movl r18=PAGE_KERNEL
177 ;;
178 dep r17=0,r19,0, KERNEL_TR_PAGE_SHIFT
179 ;;
180 or r18=r17,r18
181 ;;
182 itr.i itr[r16]=r18
183 ;;
184 itr.d dtr[r16]=r18
185 ;;
186 srlz.i
187 srlz.d
188 ;;
189 // 3. Reload ITR for PAL code.
190 GET_THIS_PADDR(r2, ia64_mca_pal_pte)
191 ;;
192 ld8 r18=[r2] // load PAL PTE
193 ;;
194 GET_THIS_PADDR(r2, ia64_mca_pal_base)
195 ;;
196 ld8 r16=[r2] // load PAL vaddr
197 mov r19=IA64_GRANULE_SHIFT<<2
198 ;;
199 mov cr.itir=r19
200 mov cr.ifa=r16
201 mov r20=IA64_TR_PALCODE
202 ;;
203 itr.i itr[r20]=r18
204 ;;
205 srlz.i
206 ;;
207 // 4. Reload DTR for stack.
208 mov r16=IA64_KR(CURRENT_STACK)
209 ;;
210 shl r16=r16,IA64_GRANULE_SHIFT
211 movl r19=PAGE_OFFSET
212 ;;
213 add r18=r19,r16
214 movl r20=PAGE_KERNEL
215 ;;
216 add r16=r20,r16
217 mov r19=IA64_GRANULE_SHIFT<<2
218 ;;
219 mov cr.itir=r19
220 mov cr.ifa=r18
221 mov r20=IA64_TR_CURRENT_STACK
222 ;;
223 itr.d dtr[r20]=r16
224 GET_THIS_PADDR(r2, ia64_mca_tr_reload)
225 mov r18 = 1
226 ;;
227 srlz.d
228 ;;
229 st8 [r2] =r18
230 ;;
231
232done_tlb_purge_and_reload:
233
234 // switch to per cpu MCA stack
235 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
236 LOAD_PHYSICAL(p0,r2,1f) // return address
237 br.sptk ia64_new_stack
2381:
239
240 // everything saved, now we can set the kernel registers
241 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
242 LOAD_PHYSICAL(p0,r2,1f) // return address
243 br.sptk ia64_set_kernel_registers
2441:
245
246 // This must be done in physical mode
247 GET_IA64_MCA_DATA(r2)
248 ;;
249 mov r7=r2
250
251 // Enter virtual mode from physical mode
252 VIRTUAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_begin, r4)
253
254 // This code returns to SAL via SOS r2, in general SAL has no unwind
255 // data. To get a clean termination when backtracing the C MCA/INIT
256 // handler, set a dummy return address of 0 in this routine. That
257 // requires that ia64_os_mca_virtual_begin be a global function.
258ENTRY(ia64_os_mca_virtual_begin)
259 .prologue
260 .save rp,r0
261 .body
262
263 mov ar.rsc=3 // set eager mode for C handler
264 mov r2=r7 // see GET_IA64_MCA_DATA above
265 ;;
266
267 // Call virtual mode handler
268 alloc r14=ar.pfs,0,0,3,0
269 ;;
270 DATA_PA_TO_VA(r2,r7)
271 ;;
272 add out0=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
273 add out1=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
274 add out2=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET, r2
275 br.call.sptk.many b0=ia64_mca_handler
276
277 // Revert back to physical mode before going back to SAL
278 PHYSICAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_end, r4)
279ia64_os_mca_virtual_end:
280
281END(ia64_os_mca_virtual_begin)
282
283 // switch back to previous stack
284 alloc r14=ar.pfs,0,0,0,0 // remove the MCA handler frame
285 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
286 LOAD_PHYSICAL(p0,r2,1f) // return address
287 br.sptk ia64_old_stack
2881:
289
290 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
291 LOAD_PHYSICAL(p0,r2,1f) // return address
292 br.sptk ia64_state_restore // restore the SAL state
2931:
294
295 mov b0=r12 // SAL_CHECK return address
296
297 br b0
298
299//EndMain//////////////////////////////////////////////////////////////////////
300
301//StartMain////////////////////////////////////////////////////////////////////
302
303//
304// NOP init handler for kdump. In panic situation, we may receive INIT
305// while kernel transition. Since we initialize registers on leave from
306// current kernel, no longer monarch/slave handlers of current kernel in
307// virtual mode are called safely.
308// We can unregister these init handlers from SAL, however then the INIT
309// will result in warmboot by SAL and we cannot retrieve the crashdump.
310// Therefore register this NOP function to SAL, to prevent entering virtual
311// mode and resulting warmboot by SAL.
312//
313ia64_os_init_on_kdump:
314 mov r8=r0 // IA64_INIT_RESUME
315 mov r9=r10 // SAL_GP
316 mov r22=r17 // *minstate
317 ;;
318 mov r10=r0 // return to same context
319 mov b0=r12 // SAL_CHECK return address
320 br b0
321
322//
323// SAL to OS entry point for INIT on all processors. This has been defined for
324// registration purposes with SAL as a part of ia64_mca_init. Monarch and
325// slave INIT have identical processing, except for the value of the
326// sos->monarch flag in r19.
327//
328
329ia64_os_init_dispatch_monarch:
330 mov r19=1 // Bow, bow, ye lower middle classes!
331 br.sptk ia64_os_init_dispatch
332
333ia64_os_init_dispatch_slave:
334 mov r19=0 // <igor>yeth, mathter</igor>
335
336ia64_os_init_dispatch:
337
338 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
339 LOAD_PHYSICAL(p0,r2,1f) // return address
340 br.sptk ia64_state_save // save the state that is not in minstate
3411:
342
343 // switch to per cpu INIT stack
344 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
345 LOAD_PHYSICAL(p0,r2,1f) // return address
346 br.sptk ia64_new_stack
3471:
348
349 // everything saved, now we can set the kernel registers
350 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
351 LOAD_PHYSICAL(p0,r2,1f) // return address
352 br.sptk ia64_set_kernel_registers
3531:
354
355 // This must be done in physical mode
356 GET_IA64_MCA_DATA(r2)
357 ;;
358 mov r7=r2
359
360 // Enter virtual mode from physical mode
361 VIRTUAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_begin, r4)
362
363 // This code returns to SAL via SOS r2, in general SAL has no unwind
364 // data. To get a clean termination when backtracing the C MCA/INIT
365 // handler, set a dummy return address of 0 in this routine. That
366 // requires that ia64_os_init_virtual_begin be a global function.
367ENTRY(ia64_os_init_virtual_begin)
368 .prologue
369 .save rp,r0
370 .body
371
372 mov ar.rsc=3 // set eager mode for C handler
373 mov r2=r7 // see GET_IA64_MCA_DATA above
374 ;;
375
376 // Call virtual mode handler
377 alloc r14=ar.pfs,0,0,3,0
378 ;;
379 DATA_PA_TO_VA(r2,r7)
380 ;;
381 add out0=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
382 add out1=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
383 add out2=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SOS_OFFSET, r2
384 br.call.sptk.many b0=ia64_init_handler
385
386 // Revert back to physical mode before going back to SAL
387 PHYSICAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_end, r4)
388ia64_os_init_virtual_end:
389
390END(ia64_os_init_virtual_begin)
391
392 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
393 LOAD_PHYSICAL(p0,r2,1f) // return address
394 br.sptk ia64_state_restore // restore the SAL state
3951:
396
397 // switch back to previous stack
398 alloc r14=ar.pfs,0,0,0,0 // remove the INIT handler frame
399 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
400 LOAD_PHYSICAL(p0,r2,1f) // return address
401 br.sptk ia64_old_stack
4021:
403
404 mov b0=r12 // SAL_CHECK return address
405 br b0
406
407//EndMain//////////////////////////////////////////////////////////////////////
408
409// common defines for the stubs
410#define ms r4
411#define regs r5
412#define temp1 r2 /* careful, it overlaps with input registers */
413#define temp2 r3 /* careful, it overlaps with input registers */
414#define temp3 r7
415#define temp4 r14
416
417
418//++
419// Name:
420// ia64_state_save()
421//
422// Stub Description:
423//
424// Save the state that is not in minstate. This is sensitive to the layout of
425// struct ia64_sal_os_state in mca.h.
426//
427// r2 contains the return address, r3 contains either
428// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
429//
430// The OS to SAL section of struct ia64_sal_os_state is set to a default
431// value of cold boot (MCA) or warm boot (INIT) and return to the same
432// context. ia64_sal_os_state is also used to hold some registers that
433// need to be saved and restored across the stack switches.
434//
435// Most input registers to this stub come from PAL/SAL
436// r1 os gp, physical
437// r8 pal_proc entry point
438// r9 sal_proc entry point
439// r10 sal gp
440// r11 MCA - rendevzous state, INIT - reason code
441// r12 sal return address
442// r17 pal min_state
443// r18 processor state parameter
444// r19 monarch flag, set by the caller of this routine
445//
446// In addition to the SAL to OS state, this routine saves all the
447// registers that appear in struct pt_regs and struct switch_stack,
448// excluding those that are already in the PAL minstate area. This
449// results in a partial pt_regs and switch_stack, the C code copies the
450// remaining registers from PAL minstate to pt_regs and switch_stack. The
451// resulting structures contain all the state of the original process when
452// MCA/INIT occurred.
453//
454//--
455
456ia64_state_save:
457 add regs=MCA_SOS_OFFSET, r3
458 add ms=MCA_SOS_OFFSET+8, r3
459 mov b0=r2 // save return address
460 cmp.eq p1,p2=IA64_MCA_CPU_MCA_STACK_OFFSET, r3
461 ;;
462 GET_IA64_MCA_DATA(temp2)
463 ;;
464 add temp1=temp2, regs // struct ia64_sal_os_state on MCA or INIT stack
465 add temp2=temp2, ms // struct ia64_sal_os_state+8 on MCA or INIT stack
466 ;;
467 mov regs=temp1 // save the start of sos
468 st8 [temp1]=r1,16 // os_gp
469 st8 [temp2]=r8,16 // pal_proc
470 ;;
471 st8 [temp1]=r9,16 // sal_proc
472 st8 [temp2]=r11,16 // rv_rc
473 mov r11=cr.iipa
474 ;;
475 st8 [temp1]=r18 // proc_state_param
476 st8 [temp2]=r19 // monarch
477 mov r6=IA64_KR(CURRENT)
478 add temp1=SOS(SAL_RA), regs
479 add temp2=SOS(SAL_GP), regs
480 ;;
481 st8 [temp1]=r12,16 // sal_ra
482 st8 [temp2]=r10,16 // sal_gp
483 mov r12=cr.isr
484 ;;
485 st8 [temp1]=r17,16 // pal_min_state
486 st8 [temp2]=r6,16 // prev_IA64_KR_CURRENT
487 mov r6=IA64_KR(CURRENT_STACK)
488 ;;
489 st8 [temp1]=r6,16 // prev_IA64_KR_CURRENT_STACK
490 st8 [temp2]=r0,16 // prev_task, starts off as NULL
491 mov r6=cr.ifa
492 ;;
493 st8 [temp1]=r12,16 // cr.isr
494 st8 [temp2]=r6,16 // cr.ifa
495 mov r12=cr.itir
496 ;;
497 st8 [temp1]=r12,16 // cr.itir
498 st8 [temp2]=r11,16 // cr.iipa
499 mov r12=cr.iim
500 ;;
501 st8 [temp1]=r12 // cr.iim
502(p1) mov r12=IA64_MCA_COLD_BOOT
503(p2) mov r12=IA64_INIT_WARM_BOOT
504 mov r6=cr.iha
505 add temp1=SOS(OS_STATUS), regs
506 ;;
507 st8 [temp2]=r6 // cr.iha
508 add temp2=SOS(CONTEXT), regs
509 st8 [temp1]=r12 // os_status, default is cold boot
510 mov r6=IA64_MCA_SAME_CONTEXT
511 ;;
512 st8 [temp2]=r6 // context, default is same context
513
514 // Save the pt_regs data that is not in minstate. The previous code
515 // left regs at sos.
516 add regs=MCA_PT_REGS_OFFSET-MCA_SOS_OFFSET, regs
517 ;;
518 add temp1=PT(B6), regs
519 mov temp3=b6
520 mov temp4=b7
521 add temp2=PT(B7), regs
522 ;;
523 st8 [temp1]=temp3,PT(AR_CSD)-PT(B6) // save b6
524 st8 [temp2]=temp4,PT(AR_SSD)-PT(B7) // save b7
525 mov temp3=ar.csd
526 mov temp4=ar.ssd
527 cover // must be last in group
528 ;;
529 st8 [temp1]=temp3,PT(AR_UNAT)-PT(AR_CSD) // save ar.csd
530 st8 [temp2]=temp4,PT(AR_PFS)-PT(AR_SSD) // save ar.ssd
531 mov temp3=ar.unat
532 mov temp4=ar.pfs
533 ;;
534 st8 [temp1]=temp3,PT(AR_RNAT)-PT(AR_UNAT) // save ar.unat
535 st8 [temp2]=temp4,PT(AR_BSPSTORE)-PT(AR_PFS) // save ar.pfs
536 mov temp3=ar.rnat
537 mov temp4=ar.bspstore
538 ;;
539 st8 [temp1]=temp3,PT(LOADRS)-PT(AR_RNAT) // save ar.rnat
540 st8 [temp2]=temp4,PT(AR_FPSR)-PT(AR_BSPSTORE) // save ar.bspstore
541 mov temp3=ar.bsp
542 ;;
543 sub temp3=temp3, temp4 // ar.bsp - ar.bspstore
544 mov temp4=ar.fpsr
545 ;;
546 shl temp3=temp3,16 // compute ar.rsc to be used for "loadrs"
547 ;;
548 st8 [temp1]=temp3,PT(AR_CCV)-PT(LOADRS) // save loadrs
549 st8 [temp2]=temp4,PT(F6)-PT(AR_FPSR) // save ar.fpsr
550 mov temp3=ar.ccv
551 ;;
552 st8 [temp1]=temp3,PT(F7)-PT(AR_CCV) // save ar.ccv
553 stf.spill [temp2]=f6,PT(F8)-PT(F6)
554 ;;
555 stf.spill [temp1]=f7,PT(F9)-PT(F7)
556 stf.spill [temp2]=f8,PT(F10)-PT(F8)
557 ;;
558 stf.spill [temp1]=f9,PT(F11)-PT(F9)
559 stf.spill [temp2]=f10
560 ;;
561 stf.spill [temp1]=f11
562
563 // Save the switch_stack data that is not in minstate nor pt_regs. The
564 // previous code left regs at pt_regs.
565 add regs=MCA_SWITCH_STACK_OFFSET-MCA_PT_REGS_OFFSET, regs
566 ;;
567 add temp1=SW(F2), regs
568 add temp2=SW(F3), regs
569 ;;
570 stf.spill [temp1]=f2,32
571 stf.spill [temp2]=f3,32
572 ;;
573 stf.spill [temp1]=f4,32
574 stf.spill [temp2]=f5,32
575 ;;
576 stf.spill [temp1]=f12,32
577 stf.spill [temp2]=f13,32
578 ;;
579 stf.spill [temp1]=f14,32
580 stf.spill [temp2]=f15,32
581 ;;
582 stf.spill [temp1]=f16,32
583 stf.spill [temp2]=f17,32
584 ;;
585 stf.spill [temp1]=f18,32
586 stf.spill [temp2]=f19,32
587 ;;
588 stf.spill [temp1]=f20,32
589 stf.spill [temp2]=f21,32
590 ;;
591 stf.spill [temp1]=f22,32
592 stf.spill [temp2]=f23,32
593 ;;
594 stf.spill [temp1]=f24,32
595 stf.spill [temp2]=f25,32
596 ;;
597 stf.spill [temp1]=f26,32
598 stf.spill [temp2]=f27,32
599 ;;
600 stf.spill [temp1]=f28,32
601 stf.spill [temp2]=f29,32
602 ;;
603 stf.spill [temp1]=f30,SW(B2)-SW(F30)
604 stf.spill [temp2]=f31,SW(B3)-SW(F31)
605 mov temp3=b2
606 mov temp4=b3
607 ;;
608 st8 [temp1]=temp3,16 // save b2
609 st8 [temp2]=temp4,16 // save b3
610 mov temp3=b4
611 mov temp4=b5
612 ;;
613 st8 [temp1]=temp3,SW(AR_LC)-SW(B4) // save b4
614 st8 [temp2]=temp4 // save b5
615 mov temp3=ar.lc
616 ;;
617 st8 [temp1]=temp3 // save ar.lc
618
619 // FIXME: Some proms are incorrectly accessing the minstate area as
620 // cached data. The C code uses region 6, uncached virtual. Ensure
621 // that there is no cache data lying around for the first 1K of the
622 // minstate area.
623 // Remove this code in September 2006, that gives platforms a year to
624 // fix their proms and get their customers updated.
625
626 add r1=32*1,r17
627 add r2=32*2,r17
628 add r3=32*3,r17
629 add r4=32*4,r17
630 add r5=32*5,r17
631 add r6=32*6,r17
632 add r7=32*7,r17
633 ;;
634 fc r17
635 fc r1
636 fc r2
637 fc r3
638 fc r4
639 fc r5
640 fc r6
641 fc r7
642 add r17=32*8,r17
643 add r1=32*8,r1
644 add r2=32*8,r2
645 add r3=32*8,r3
646 add r4=32*8,r4
647 add r5=32*8,r5
648 add r6=32*8,r6
649 add r7=32*8,r7
650 ;;
651 fc r17
652 fc r1
653 fc r2
654 fc r3
655 fc r4
656 fc r5
657 fc r6
658 fc r7
659 add r17=32*8,r17
660 add r1=32*8,r1
661 add r2=32*8,r2
662 add r3=32*8,r3
663 add r4=32*8,r4
664 add r5=32*8,r5
665 add r6=32*8,r6
666 add r7=32*8,r7
667 ;;
668 fc r17
669 fc r1
670 fc r2
671 fc r3
672 fc r4
673 fc r5
674 fc r6
675 fc r7
676 add r17=32*8,r17
677 add r1=32*8,r1
678 add r2=32*8,r2
679 add r3=32*8,r3
680 add r4=32*8,r4
681 add r5=32*8,r5
682 add r6=32*8,r6
683 add r7=32*8,r7
684 ;;
685 fc r17
686 fc r1
687 fc r2
688 fc r3
689 fc r4
690 fc r5
691 fc r6
692 fc r7
693
694 br.sptk b0
695
696//EndStub//////////////////////////////////////////////////////////////////////
697
698
699//++
700// Name:
701// ia64_state_restore()
702//
703// Stub Description:
704//
705// Restore the SAL/OS state. This is sensitive to the layout of struct
706// ia64_sal_os_state in mca.h.
707//
708// r2 contains the return address, r3 contains either
709// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
710//
711// In addition to the SAL to OS state, this routine restores all the
712// registers that appear in struct pt_regs and struct switch_stack,
713// excluding those in the PAL minstate area.
714//
715//--
716
717ia64_state_restore:
718 // Restore the switch_stack data that is not in minstate nor pt_regs.
719 add regs=MCA_SWITCH_STACK_OFFSET, r3
720 mov b0=r2 // save return address
721 ;;
722 GET_IA64_MCA_DATA(temp2)
723 ;;
724 add regs=temp2, regs
725 ;;
726 add temp1=SW(F2), regs
727 add temp2=SW(F3), regs
728 ;;
729 ldf.fill f2=[temp1],32
730 ldf.fill f3=[temp2],32
731 ;;
732 ldf.fill f4=[temp1],32
733 ldf.fill f5=[temp2],32
734 ;;
735 ldf.fill f12=[temp1],32
736 ldf.fill f13=[temp2],32
737 ;;
738 ldf.fill f14=[temp1],32
739 ldf.fill f15=[temp2],32
740 ;;
741 ldf.fill f16=[temp1],32
742 ldf.fill f17=[temp2],32
743 ;;
744 ldf.fill f18=[temp1],32
745 ldf.fill f19=[temp2],32
746 ;;
747 ldf.fill f20=[temp1],32
748 ldf.fill f21=[temp2],32
749 ;;
750 ldf.fill f22=[temp1],32
751 ldf.fill f23=[temp2],32
752 ;;
753 ldf.fill f24=[temp1],32
754 ldf.fill f25=[temp2],32
755 ;;
756 ldf.fill f26=[temp1],32
757 ldf.fill f27=[temp2],32
758 ;;
759 ldf.fill f28=[temp1],32
760 ldf.fill f29=[temp2],32
761 ;;
762 ldf.fill f30=[temp1],SW(B2)-SW(F30)
763 ldf.fill f31=[temp2],SW(B3)-SW(F31)
764 ;;
765 ld8 temp3=[temp1],16 // restore b2
766 ld8 temp4=[temp2],16 // restore b3
767 ;;
768 mov b2=temp3
769 mov b3=temp4
770 ld8 temp3=[temp1],SW(AR_LC)-SW(B4) // restore b4
771 ld8 temp4=[temp2] // restore b5
772 ;;
773 mov b4=temp3
774 mov b5=temp4
775 ld8 temp3=[temp1] // restore ar.lc
776 ;;
777 mov ar.lc=temp3
778
779 // Restore the pt_regs data that is not in minstate. The previous code
780 // left regs at switch_stack.
781 add regs=MCA_PT_REGS_OFFSET-MCA_SWITCH_STACK_OFFSET, regs
782 ;;
783 add temp1=PT(B6), regs
784 add temp2=PT(B7), regs
785 ;;
786 ld8 temp3=[temp1],PT(AR_CSD)-PT(B6) // restore b6
787 ld8 temp4=[temp2],PT(AR_SSD)-PT(B7) // restore b7
788 ;;
789 mov b6=temp3
790 mov b7=temp4
791 ld8 temp3=[temp1],PT(AR_UNAT)-PT(AR_CSD) // restore ar.csd
792 ld8 temp4=[temp2],PT(AR_PFS)-PT(AR_SSD) // restore ar.ssd
793 ;;
794 mov ar.csd=temp3
795 mov ar.ssd=temp4
796 ld8 temp3=[temp1] // restore ar.unat
797 add temp1=PT(AR_CCV)-PT(AR_UNAT), temp1
798 ld8 temp4=[temp2],PT(AR_FPSR)-PT(AR_PFS) // restore ar.pfs
799 ;;
800 mov ar.unat=temp3
801 mov ar.pfs=temp4
802 // ar.rnat, ar.bspstore, loadrs are restore in ia64_old_stack.
803 ld8 temp3=[temp1],PT(F6)-PT(AR_CCV) // restore ar.ccv
804 ld8 temp4=[temp2],PT(F7)-PT(AR_FPSR) // restore ar.fpsr
805 ;;
806 mov ar.ccv=temp3
807 mov ar.fpsr=temp4
808 ldf.fill f6=[temp1],PT(F8)-PT(F6)
809 ldf.fill f7=[temp2],PT(F9)-PT(F7)
810 ;;
811 ldf.fill f8=[temp1],PT(F10)-PT(F8)
812 ldf.fill f9=[temp2],PT(F11)-PT(F9)
813 ;;
814 ldf.fill f10=[temp1]
815 ldf.fill f11=[temp2]
816
817 // Restore the SAL to OS state. The previous code left regs at pt_regs.
818 add regs=MCA_SOS_OFFSET-MCA_PT_REGS_OFFSET, regs
819 ;;
820 add temp1=SOS(SAL_RA), regs
821 add temp2=SOS(SAL_GP), regs
822 ;;
823 ld8 r12=[temp1],16 // sal_ra
824 ld8 r9=[temp2],16 // sal_gp
825 ;;
826 ld8 r22=[temp1],16 // pal_min_state, virtual
827 ld8 r13=[temp2],16 // prev_IA64_KR_CURRENT
828 ;;
829 ld8 r16=[temp1],16 // prev_IA64_KR_CURRENT_STACK
830 ld8 r20=[temp2],16 // prev_task
831 ;;
832 ld8 temp3=[temp1],16 // cr.isr
833 ld8 temp4=[temp2],16 // cr.ifa
834 ;;
835 mov cr.isr=temp3
836 mov cr.ifa=temp4
837 ld8 temp3=[temp1],16 // cr.itir
838 ld8 temp4=[temp2],16 // cr.iipa
839 ;;
840 mov cr.itir=temp3
841 mov cr.iipa=temp4
842 ld8 temp3=[temp1] // cr.iim
843 ld8 temp4=[temp2] // cr.iha
844 add temp1=SOS(OS_STATUS), regs
845 add temp2=SOS(CONTEXT), regs
846 ;;
847 mov cr.iim=temp3
848 mov cr.iha=temp4
849 dep r22=0,r22,62,1 // pal_min_state, physical, uncached
850 mov IA64_KR(CURRENT)=r13
851 ld8 r8=[temp1] // os_status
852 ld8 r10=[temp2] // context
853
854 /* Wire IA64_TR_CURRENT_STACK to the stack that we are resuming to. To
855 * avoid any dependencies on the algorithm in ia64_switch_to(), just
856 * purge any existing CURRENT_STACK mapping and insert the new one.
857 *
858 * r16 contains prev_IA64_KR_CURRENT_STACK, r13 contains
859 * prev_IA64_KR_CURRENT, these values may have been changed by the C
860 * code. Do not use r8, r9, r10, r22, they contain values ready for
861 * the return to SAL.
862 */
863
864 mov r15=IA64_KR(CURRENT_STACK) // physical granule mapped by IA64_TR_CURRENT_STACK
865 ;;
866 shl r15=r15,IA64_GRANULE_SHIFT
867 ;;
868 dep r15=-1,r15,61,3 // virtual granule
869 mov r18=IA64_GRANULE_SHIFT<<2 // for cr.itir.ps
870 ;;
871 ptr.d r15,r18
872 ;;
873 srlz.d
874
875 extr.u r19=r13,61,3 // r13 = prev_IA64_KR_CURRENT
876 shl r20=r16,IA64_GRANULE_SHIFT // r16 = prev_IA64_KR_CURRENT_STACK
877 movl r21=PAGE_KERNEL // page properties
878 ;;
879 mov IA64_KR(CURRENT_STACK)=r16
880 cmp.ne p6,p0=RGN_KERNEL,r19 // new stack is in the kernel region?
881 or r21=r20,r21 // construct PA | page properties
882(p6) br.spnt 1f // the dreaded cpu 0 idle task in region 5:(
883 ;;
884 mov cr.itir=r18
885 mov cr.ifa=r13
886 mov r20=IA64_TR_CURRENT_STACK
887 ;;
888 itr.d dtr[r20]=r21
889 ;;
890 srlz.d
8911:
892
893 br.sptk b0
894
895//EndStub//////////////////////////////////////////////////////////////////////
896
897
898//++
899// Name:
900// ia64_new_stack()
901//
902// Stub Description:
903//
904// Switch to the MCA/INIT stack.
905//
906// r2 contains the return address, r3 contains either
907// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
908//
909// On entry RBS is still on the original stack, this routine switches RBS
910// to use the MCA/INIT stack.
911//
912// On entry, sos->pal_min_state is physical, on exit it is virtual.
913//
914//--
915
916ia64_new_stack:
917 add regs=MCA_PT_REGS_OFFSET, r3
918 add temp2=MCA_SOS_OFFSET+SOS(PAL_MIN_STATE), r3
919 mov b0=r2 // save return address
920 GET_IA64_MCA_DATA(temp1)
921 invala
922 ;;
923 add temp2=temp2, temp1 // struct ia64_sal_os_state.pal_min_state on MCA or INIT stack
924 add regs=regs, temp1 // struct pt_regs on MCA or INIT stack
925 ;;
926 // Address of minstate area provided by PAL is physical, uncacheable.
927 // Convert to Linux virtual address in region 6 for C code.
928 ld8 ms=[temp2] // pal_min_state, physical
929 ;;
930 dep temp1=-1,ms,62,2 // set region 6
931 mov temp3=IA64_RBS_OFFSET-MCA_PT_REGS_OFFSET
932 ;;
933 st8 [temp2]=temp1 // pal_min_state, virtual
934
935 add temp4=temp3, regs // start of bspstore on new stack
936 ;;
937 mov ar.bspstore=temp4 // switch RBS to MCA/INIT stack
938 ;;
939 flushrs // must be first in group
940 br.sptk b0
941
942//EndStub//////////////////////////////////////////////////////////////////////
943
944
945//++
946// Name:
947// ia64_old_stack()
948//
949// Stub Description:
950//
951// Switch to the old stack.
952//
953// r2 contains the return address, r3 contains either
954// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
955//
956// On entry, pal_min_state is virtual, on exit it is physical.
957//
958// On entry RBS is on the MCA/INIT stack, this routine switches RBS
959// back to the previous stack.
960//
961// The psr is set to all zeroes. SAL return requires either all zeroes or
962// just psr.mc set. Leaving psr.mc off allows INIT to be issued if this
963// code does not perform correctly.
964//
965// The dirty registers at the time of the event were flushed to the
966// MCA/INIT stack in ia64_pt_regs_save(). Restore the dirty registers
967// before reverting to the previous bspstore.
968//--
969
970ia64_old_stack:
971 add regs=MCA_PT_REGS_OFFSET, r3
972 mov b0=r2 // save return address
973 GET_IA64_MCA_DATA(temp2)
974 LOAD_PHYSICAL(p0,temp1,1f)
975 ;;
976 mov cr.ipsr=r0
977 mov cr.ifs=r0
978 mov cr.iip=temp1
979 ;;
980 invala
981 rfi
9821:
983
984 add regs=regs, temp2 // struct pt_regs on MCA or INIT stack
985 ;;
986 add temp1=PT(LOADRS), regs
987 ;;
988 ld8 temp2=[temp1],PT(AR_BSPSTORE)-PT(LOADRS) // restore loadrs
989 ;;
990 ld8 temp3=[temp1],PT(AR_RNAT)-PT(AR_BSPSTORE) // restore ar.bspstore
991 mov ar.rsc=temp2
992 ;;
993 loadrs
994 ld8 temp4=[temp1] // restore ar.rnat
995 ;;
996 mov ar.bspstore=temp3 // back to old stack
997 ;;
998 mov ar.rnat=temp4
999 ;;
1000
1001 br.sptk b0
1002
1003//EndStub//////////////////////////////////////////////////////////////////////
1004
1005
1006//++
1007// Name:
1008// ia64_set_kernel_registers()
1009//
1010// Stub Description:
1011//
1012// Set the registers that are required by the C code in order to run on an
1013// MCA/INIT stack.
1014//
1015// r2 contains the return address, r3 contains either
1016// IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
1017//
1018//--
1019
1020ia64_set_kernel_registers:
1021 add temp3=MCA_SP_OFFSET, r3
1022 mov b0=r2 // save return address
1023 GET_IA64_MCA_DATA(temp1)
1024 ;;
1025 add r12=temp1, temp3 // kernel stack pointer on MCA/INIT stack
1026 add r13=temp1, r3 // set current to start of MCA/INIT stack
1027 add r20=temp1, r3 // physical start of MCA/INIT stack
1028 ;;
1029 DATA_PA_TO_VA(r12,temp2)
1030 DATA_PA_TO_VA(r13,temp3)
1031 ;;
1032 mov IA64_KR(CURRENT)=r13
1033
1034 /* Wire IA64_TR_CURRENT_STACK to the MCA/INIT handler stack. To avoid
1035 * any dependencies on the algorithm in ia64_switch_to(), just purge
1036 * any existing CURRENT_STACK mapping and insert the new one.
1037 */
1038
1039 mov r16=IA64_KR(CURRENT_STACK) // physical granule mapped by IA64_TR_CURRENT_STACK
1040 ;;
1041 shl r16=r16,IA64_GRANULE_SHIFT
1042 ;;
1043 dep r16=-1,r16,61,3 // virtual granule
1044 mov r18=IA64_GRANULE_SHIFT<<2 // for cr.itir.ps
1045 ;;
1046 ptr.d r16,r18
1047 ;;
1048 srlz.d
1049
1050 shr.u r16=r20,IA64_GRANULE_SHIFT // r20 = physical start of MCA/INIT stack
1051 movl r21=PAGE_KERNEL // page properties
1052 ;;
1053 mov IA64_KR(CURRENT_STACK)=r16
1054 or r21=r20,r21 // construct PA | page properties
1055 ;;
1056 mov cr.itir=r18
1057 mov cr.ifa=r13
1058 mov r20=IA64_TR_CURRENT_STACK
1059
1060 movl r17=FPSR_DEFAULT
1061 ;;
1062 mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
1063 ;;
1064 itr.d dtr[r20]=r21
1065 ;;
1066 srlz.d
1067
1068 br.sptk b0
1069
1070//EndStub//////////////////////////////////////////////////////////////////////
1071
1072#undef ms
1073#undef regs
1074#undef temp1
1075#undef temp2
1076#undef temp3
1077#undef temp4
1078
1079
1080// Support function for mca.c, it is here to avoid using inline asm. Given the
1081// address of an rnat slot, if that address is below the current ar.bspstore
1082// then return the contents of that slot, otherwise return the contents of
1083// ar.rnat.
1084GLOBAL_ENTRY(ia64_get_rnat)
1085 alloc r14=ar.pfs,1,0,0,0
1086 mov ar.rsc=0
1087 ;;
1088 mov r14=ar.bspstore
1089 ;;
1090 cmp.lt p6,p7=in0,r14
1091 ;;
1092(p6) ld8 r8=[in0]
1093(p7) mov r8=ar.rnat
1094 mov ar.rsc=3
1095 br.ret.sptk.many rp
1096END(ia64_get_rnat)
1097
1098
1099// void ia64_set_psr_mc(void)
1100//
1101// Set psr.mc bit to mask MCA/INIT.
1102GLOBAL_ENTRY(ia64_set_psr_mc)
1103 rsm psr.i | psr.ic // disable interrupts
1104 ;;
1105 srlz.d
1106 ;;
1107 mov r14 = psr // get psr{36:35,31:0}
1108 movl r15 = 1f
1109 ;;
1110 dep r14 = -1, r14, PSR_MC, 1 // set psr.mc
1111 ;;
1112 dep r14 = -1, r14, PSR_IC, 1 // set psr.ic
1113 ;;
1114 dep r14 = -1, r14, PSR_BN, 1 // keep bank1 in use
1115 ;;
1116 mov cr.ipsr = r14
1117 mov cr.ifs = r0
1118 mov cr.iip = r15
1119 ;;
1120 rfi
11211:
1122 br.ret.sptk.many rp
1123END(ia64_set_psr_mc)