2 // assembly portion of the IA64 MCA handling
4 // Mods by cfleck to integrate into kernel build
5 // 00/03/15 davidm Added various stop bits to get a clean compile
7 // 00/03/29 cfleck Added code to save INIT handoff state in pt_regs format, switch to temp
8 // kstack, switch modes, jump to C INIT handler
10 // 02/01/04 J.Hall <jenna.s.hall@intel.com>
11 // Before entering virtual mode code:
12 // 1. Check for TLB CPU error
13 // 2. Restore current thread pointer to kr6
14 // 3. Move stack ptr 16 bytes to conform to C calling convention
16 // 04/11/12 Russ Anderson <rja@sgi.com>
17 // Added per cpu MCA/INIT stack save areas.
19 // 12/08/05 Keith Owens <kaos@sgi.com>
20 // Use per cpu MCA/INIT stacks for all data.
22 #include <linux/threads.h>
24 #include <asm/asmmacro.h>
25 #include <asm/pgtable.h>
26 #include <asm/processor.h>
27 #include <asm/mca_asm.h>
32 #define GET_IA64_MCA_DATA(reg) \
33 GET_THIS_PADDR(reg, ia64_mca_data) \
37 .global ia64_do_tlb_purge
38 .global ia64_os_mca_dispatch
39 .global ia64_os_init_dispatch_monarch
40 .global ia64_os_init_dispatch_slave
45 //StartMain////////////////////////////////////////////////////////////////////
48 * Just the TLB purge part is moved to a separate function
49 * so we can re-use the code for cpu hotplug code as well
50 * Caller should now setup b1, so we can branch once the
51 * tlb flush is complete.
55 #define O(member) IA64_CPUINFO_##member##_OFFSET
57 GET_THIS_PADDR(r2, cpu_info) // load phys addr of cpu_info into r2
59 addl r17=O(PTCE_STRIDE),r2
60 addl r2=O(PTCE_BASE),r2
62 ld8 r18=[r2],(O(PTCE_COUNT)-O(PTCE_BASE));; // r18=ptce_base
63 ld4 r19=[r2],4 // r19=ptce_count[0]
64 ld4 r21=[r17],4 // r21=ptce_stride[0]
66 ld4 r20=[r2] // r20=ptce_count[1]
67 ld4 r22=[r17] // r22=ptce_stride[1]
76 (p7) br.cond.dpnt.few 4f
89 srlz.i // srlz.i implies srlz.d
92 // Now purge addresses formerly mapped by TR registers
93 // 1. Purge ITR&DTR for kernel.
95 mov r18=KERNEL_TR_PAGE_SHIFT<<2
104 // 3. Purge ITR for PAL code.
105 GET_THIS_PADDR(r2, ia64_mca_pal_base)
108 mov r18=IA64_GRANULE_SHIFT<<2
114 // 4. Purge DTR for stack.
115 mov r16=IA64_KR(CURRENT_STACK)
117 shl r16=r16,IA64_GRANULE_SHIFT
121 mov r18=IA64_GRANULE_SHIFT<<2
127 // Now branch away to caller.
131 //EndMain//////////////////////////////////////////////////////////////////////
133 //StartMain////////////////////////////////////////////////////////////////////
135 ia64_os_mca_dispatch:
136 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
137 LOAD_PHYSICAL(p0,r2,1f) // return address
138 mov r19=1 // All MCA events are treated as monarch (for now)
139 br.sptk ia64_state_save // save the state that is not in minstate
142 GET_IA64_MCA_DATA(r2)
143 // Using MCA stack, struct ia64_sal_os_state, variable proc_state_param
145 add r3=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET+SOS(PROC_STATE_PARAM), r2
147 ld8 r18=[r3] // Get processor state parameter on existing PALE_CHECK.
150 (p7) br.spnt done_tlb_purge_and_reload
152 // The following code purges TC and TR entries. Then reload all TC entries.
153 // Purge percpu data TC entries.
154 begin_tlb_purge_and_reload:
155 movl r18=ia64_reload_tr;;
156 LOAD_PHYSICAL(p0,r18,ia64_reload_tr);;
158 br.sptk.many ia64_do_tlb_purge;;
161 // Finally reload the TR registers.
162 // 1. Reload DTR/ITR registers for kernel.
163 mov r18=KERNEL_TR_PAGE_SHIFT<<2
164 movl r17=KERNEL_START
168 mov r16=IA64_TR_KERNEL
172 dep r17=0,r19,0, KERNEL_TR_PAGE_SHIFT
183 // 3. Reload ITR for PAL code.
184 GET_THIS_PADDR(r2, ia64_mca_pal_pte)
186 ld8 r18=[r2] // load PAL PTE
188 GET_THIS_PADDR(r2, ia64_mca_pal_base)
190 ld8 r16=[r2] // load PAL vaddr
191 mov r19=IA64_GRANULE_SHIFT<<2
195 mov r20=IA64_TR_PALCODE
201 // 4. Reload DTR for stack.
202 mov r16=IA64_KR(CURRENT_STACK)
204 shl r16=r16,IA64_GRANULE_SHIFT
211 mov r19=IA64_GRANULE_SHIFT<<2
215 mov r20=IA64_TR_CURRENT_STACK
221 done_tlb_purge_and_reload:
223 // switch to per cpu MCA stack
224 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
225 LOAD_PHYSICAL(p0,r2,1f) // return address
226 br.sptk ia64_new_stack
229 // everything saved, now we can set the kernel registers
230 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
231 LOAD_PHYSICAL(p0,r2,1f) // return address
232 br.sptk ia64_set_kernel_registers
235 // This must be done in physical mode
236 GET_IA64_MCA_DATA(r2)
240 // Enter virtual mode from physical mode
241 VIRTUAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_begin, r4)
243 // This code returns to SAL via SOS r2, in general SAL has no unwind
244 // data. To get a clean termination when backtracing the C MCA/INIT
245 // handler, set a dummy return address of 0 in this routine. That
246 // requires that ia64_os_mca_virtual_begin be a global function.
247 ENTRY(ia64_os_mca_virtual_begin)
252 mov ar.rsc=3 // set eager mode for C handler
253 mov r2=r7 // see GET_IA64_MCA_DATA above
256 // Call virtual mode handler
257 alloc r14=ar.pfs,0,0,3,0
261 add out0=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
262 add out1=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
263 add out2=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET, r2
264 br.call.sptk.many b0=ia64_mca_handler
266 // Revert back to physical mode before going back to SAL
267 PHYSICAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_end, r4)
268 ia64_os_mca_virtual_end:
270 END(ia64_os_mca_virtual_begin)
272 // switch back to previous stack
273 alloc r14=ar.pfs,0,0,0,0 // remove the MCA handler frame
274 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
275 LOAD_PHYSICAL(p0,r2,1f) // return address
276 br.sptk ia64_old_stack
279 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
280 LOAD_PHYSICAL(p0,r2,1f) // return address
281 br.sptk ia64_state_restore // restore the SAL state
284 mov b0=r12 // SAL_CHECK return address
288 //EndMain//////////////////////////////////////////////////////////////////////
290 //StartMain////////////////////////////////////////////////////////////////////
293 // SAL to OS entry point for INIT on all processors. This has been defined for
294 // registration purposes with SAL as a part of ia64_mca_init. Monarch and
295 // slave INIT have identical processing, except for the value of the
296 // sos->monarch flag in r19.
299 ia64_os_init_dispatch_monarch:
300 mov r19=1 // Bow, bow, ye lower middle classes!
301 br.sptk ia64_os_init_dispatch
303 ia64_os_init_dispatch_slave:
304 mov r19=0 // <igor>yeth, mathter</igor>
306 ia64_os_init_dispatch:
308 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
309 LOAD_PHYSICAL(p0,r2,1f) // return address
310 br.sptk ia64_state_save // save the state that is not in minstate
313 // switch to per cpu INIT stack
314 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
315 LOAD_PHYSICAL(p0,r2,1f) // return address
316 br.sptk ia64_new_stack
319 // everything saved, now we can set the kernel registers
320 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
321 LOAD_PHYSICAL(p0,r2,1f) // return address
322 br.sptk ia64_set_kernel_registers
325 // This must be done in physical mode
326 GET_IA64_MCA_DATA(r2)
330 // Enter virtual mode from physical mode
331 VIRTUAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_begin, r4)
333 // This code returns to SAL via SOS r2, in general SAL has no unwind
334 // data. To get a clean termination when backtracing the C MCA/INIT
335 // handler, set a dummy return address of 0 in this routine. That
336 // requires that ia64_os_init_virtual_begin be a global function.
337 ENTRY(ia64_os_init_virtual_begin)
342 mov ar.rsc=3 // set eager mode for C handler
343 mov r2=r7 // see GET_IA64_MCA_DATA above
346 // Call virtual mode handler
347 alloc r14=ar.pfs,0,0,3,0
351 add out0=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
352 add out1=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
353 add out2=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SOS_OFFSET, r2
354 br.call.sptk.many b0=ia64_init_handler
356 // Revert back to physical mode before going back to SAL
357 PHYSICAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_end, r4)
358 ia64_os_init_virtual_end:
360 END(ia64_os_init_virtual_begin)
362 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
363 LOAD_PHYSICAL(p0,r2,1f) // return address
364 br.sptk ia64_state_restore // restore the SAL state
367 // switch back to previous stack
368 alloc r14=ar.pfs,0,0,0,0 // remove the INIT handler frame
369 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
370 LOAD_PHYSICAL(p0,r2,1f) // return address
371 br.sptk ia64_old_stack
374 mov b0=r12 // SAL_CHECK return address
377 //EndMain//////////////////////////////////////////////////////////////////////
379 // common defines for the stubs
382 #define temp1 r2 /* careful, it overlaps with input registers */
383 #define temp2 r3 /* careful, it overlaps with input registers */
394 // Save the state that is not in minstate. This is sensitive to the layout of
395 // struct ia64_sal_os_state in mca.h.
397 // r2 contains the return address, r3 contains either
398 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
400 // The OS to SAL section of struct ia64_sal_os_state is set to a default
401 // value of cold boot (MCA) or warm boot (INIT) and return to the same
402 // context. ia64_sal_os_state is also used to hold some registers that
403 // need to be saved and restored across the stack switches.
405 // Most input registers to this stub come from PAL/SAL
406 // r1 os gp, physical
407 // r8 pal_proc entry point
408 // r9 sal_proc entry point
410 // r11 MCA - rendevzous state, INIT - reason code
411 // r12 sal return address
413 // r18 processor state parameter
414 // r19 monarch flag, set by the caller of this routine
416 // In addition to the SAL to OS state, this routine saves all the
417 // registers that appear in struct pt_regs and struct switch_stack,
418 // excluding those that are already in the PAL minstate area. This
419 // results in a partial pt_regs and switch_stack, the C code copies the
420 // remaining registers from PAL minstate to pt_regs and switch_stack. The
421 // resulting structures contain all the state of the original process when
422 // MCA/INIT occurred.
427 add regs=MCA_SOS_OFFSET, r3
428 add ms=MCA_SOS_OFFSET+8, r3
429 mov b0=r2 // save return address
430 cmp.eq p1,p2=IA64_MCA_CPU_MCA_STACK_OFFSET, r3
432 GET_IA64_MCA_DATA(temp2)
434 add temp1=temp2, regs // struct ia64_sal_os_state on MCA or INIT stack
435 add temp2=temp2, ms // struct ia64_sal_os_state+8 on MCA or INIT stack
437 mov regs=temp1 // save the start of sos
438 st8 [temp1]=r1,16 // os_gp
439 st8 [temp2]=r8,16 // pal_proc
441 st8 [temp1]=r9,16 // sal_proc
442 st8 [temp2]=r11,16 // rv_rc
445 st8 [temp1]=r18 // proc_state_param
446 st8 [temp2]=r19 // monarch
447 mov r6=IA64_KR(CURRENT)
448 add temp1=SOS(SAL_RA), regs
449 add temp2=SOS(SAL_GP), regs
451 st8 [temp1]=r12,16 // sal_ra
452 st8 [temp2]=r10,16 // sal_gp
455 st8 [temp1]=r17,16 // pal_min_state
456 st8 [temp2]=r6,16 // prev_IA64_KR_CURRENT
457 mov r6=IA64_KR(CURRENT_STACK)
459 st8 [temp1]=r6,16 // prev_IA64_KR_CURRENT_STACK
460 st8 [temp2]=r0,16 // prev_task, starts off as NULL
463 st8 [temp1]=r12,16 // cr.isr
464 st8 [temp2]=r6,16 // cr.ifa
467 st8 [temp1]=r12,16 // cr.itir
468 st8 [temp2]=r11,16 // cr.iipa
471 st8 [temp1]=r12 // cr.iim
472 (p1) mov r12=IA64_MCA_COLD_BOOT
473 (p2) mov r12=IA64_INIT_WARM_BOOT
475 add temp1=SOS(OS_STATUS), regs
477 st8 [temp2]=r6 // cr.iha
478 add temp2=SOS(CONTEXT), regs
479 st8 [temp1]=r12 // os_status, default is cold boot
480 mov r6=IA64_MCA_SAME_CONTEXT
482 st8 [temp2]=r6 // context, default is same context
484 // Save the pt_regs data that is not in minstate. The previous code
486 add regs=MCA_PT_REGS_OFFSET-MCA_SOS_OFFSET, regs
488 add temp1=PT(B6), regs
491 add temp2=PT(B7), regs
493 st8 [temp1]=temp3,PT(AR_CSD)-PT(B6) // save b6
494 st8 [temp2]=temp4,PT(AR_SSD)-PT(B7) // save b7
497 cover // must be last in group
499 st8 [temp1]=temp3,PT(AR_UNAT)-PT(AR_CSD) // save ar.csd
500 st8 [temp2]=temp4,PT(AR_PFS)-PT(AR_SSD) // save ar.ssd
504 st8 [temp1]=temp3,PT(AR_RNAT)-PT(AR_UNAT) // save ar.unat
505 st8 [temp2]=temp4,PT(AR_BSPSTORE)-PT(AR_PFS) // save ar.pfs
507 mov temp4=ar.bspstore
509 st8 [temp1]=temp3,PT(LOADRS)-PT(AR_RNAT) // save ar.rnat
510 st8 [temp2]=temp4,PT(AR_FPSR)-PT(AR_BSPSTORE) // save ar.bspstore
513 sub temp3=temp3, temp4 // ar.bsp - ar.bspstore
516 shl temp3=temp3,16 // compute ar.rsc to be used for "loadrs"
518 st8 [temp1]=temp3,PT(AR_CCV)-PT(LOADRS) // save loadrs
519 st8 [temp2]=temp4,PT(F6)-PT(AR_FPSR) // save ar.fpsr
522 st8 [temp1]=temp3,PT(F7)-PT(AR_CCV) // save ar.ccv
523 stf.spill [temp2]=f6,PT(F8)-PT(F6)
525 stf.spill [temp1]=f7,PT(F9)-PT(F7)
526 stf.spill [temp2]=f8,PT(F10)-PT(F8)
528 stf.spill [temp1]=f9,PT(F11)-PT(F9)
529 stf.spill [temp2]=f10
531 stf.spill [temp1]=f11
533 // Save the switch_stack data that is not in minstate nor pt_regs. The
534 // previous code left regs at pt_regs.
535 add regs=MCA_SWITCH_STACK_OFFSET-MCA_PT_REGS_OFFSET, regs
537 add temp1=SW(F2), regs
538 add temp2=SW(F3), regs
540 stf.spill [temp1]=f2,32
541 stf.spill [temp2]=f3,32
543 stf.spill [temp1]=f4,32
544 stf.spill [temp2]=f5,32
546 stf.spill [temp1]=f12,32
547 stf.spill [temp2]=f13,32
549 stf.spill [temp1]=f14,32
550 stf.spill [temp2]=f15,32
552 stf.spill [temp1]=f16,32
553 stf.spill [temp2]=f17,32
555 stf.spill [temp1]=f18,32
556 stf.spill [temp2]=f19,32
558 stf.spill [temp1]=f20,32
559 stf.spill [temp2]=f21,32
561 stf.spill [temp1]=f22,32
562 stf.spill [temp2]=f23,32
564 stf.spill [temp1]=f24,32
565 stf.spill [temp2]=f25,32
567 stf.spill [temp1]=f26,32
568 stf.spill [temp2]=f27,32
570 stf.spill [temp1]=f28,32
571 stf.spill [temp2]=f29,32
573 stf.spill [temp1]=f30,SW(B2)-SW(F30)
574 stf.spill [temp2]=f31,SW(B3)-SW(F31)
578 st8 [temp1]=temp3,16 // save b2
579 st8 [temp2]=temp4,16 // save b3
583 st8 [temp1]=temp3,SW(AR_LC)-SW(B4) // save b4
584 st8 [temp2]=temp4 // save b5
587 st8 [temp1]=temp3 // save ar.lc
589 // FIXME: Some proms are incorrectly accessing the minstate area as
590 // cached data. The C code uses region 6, uncached virtual. Ensure
591 // that there is no cache data lying around for the first 1K of the
593 // Remove this code in September 2006, that gives platforms a year to
594 // fix their proms and get their customers updated.
666 //EndStub//////////////////////////////////////////////////////////////////////
671 // ia64_state_restore()
675 // Restore the SAL/OS state. This is sensitive to the layout of struct
676 // ia64_sal_os_state in mca.h.
678 // r2 contains the return address, r3 contains either
679 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
681 // In addition to the SAL to OS state, this routine restores all the
682 // registers that appear in struct pt_regs and struct switch_stack,
683 // excluding those in the PAL minstate area.
688 // Restore the switch_stack data that is not in minstate nor pt_regs.
689 add regs=MCA_SWITCH_STACK_OFFSET, r3
690 mov b0=r2 // save return address
692 GET_IA64_MCA_DATA(temp2)
696 add temp1=SW(F2), regs
697 add temp2=SW(F3), regs
699 ldf.fill f2=[temp1],32
700 ldf.fill f3=[temp2],32
702 ldf.fill f4=[temp1],32
703 ldf.fill f5=[temp2],32
705 ldf.fill f12=[temp1],32
706 ldf.fill f13=[temp2],32
708 ldf.fill f14=[temp1],32
709 ldf.fill f15=[temp2],32
711 ldf.fill f16=[temp1],32
712 ldf.fill f17=[temp2],32
714 ldf.fill f18=[temp1],32
715 ldf.fill f19=[temp2],32
717 ldf.fill f20=[temp1],32
718 ldf.fill f21=[temp2],32
720 ldf.fill f22=[temp1],32
721 ldf.fill f23=[temp2],32
723 ldf.fill f24=[temp1],32
724 ldf.fill f25=[temp2],32
726 ldf.fill f26=[temp1],32
727 ldf.fill f27=[temp2],32
729 ldf.fill f28=[temp1],32
730 ldf.fill f29=[temp2],32
732 ldf.fill f30=[temp1],SW(B2)-SW(F30)
733 ldf.fill f31=[temp2],SW(B3)-SW(F31)
735 ld8 temp3=[temp1],16 // restore b2
736 ld8 temp4=[temp2],16 // restore b3
740 ld8 temp3=[temp1],SW(AR_LC)-SW(B4) // restore b4
741 ld8 temp4=[temp2] // restore b5
745 ld8 temp3=[temp1] // restore ar.lc
749 // Restore the pt_regs data that is not in minstate. The previous code
750 // left regs at switch_stack.
751 add regs=MCA_PT_REGS_OFFSET-MCA_SWITCH_STACK_OFFSET, regs
753 add temp1=PT(B6), regs
754 add temp2=PT(B7), regs
756 ld8 temp3=[temp1],PT(AR_CSD)-PT(B6) // restore b6
757 ld8 temp4=[temp2],PT(AR_SSD)-PT(B7) // restore b7
761 ld8 temp3=[temp1],PT(AR_UNAT)-PT(AR_CSD) // restore ar.csd
762 ld8 temp4=[temp2],PT(AR_PFS)-PT(AR_SSD) // restore ar.ssd
766 ld8 temp3=[temp1] // restore ar.unat
767 add temp1=PT(AR_CCV)-PT(AR_UNAT), temp1
768 ld8 temp4=[temp2],PT(AR_FPSR)-PT(AR_PFS) // restore ar.pfs
772 // ar.rnat, ar.bspstore, loadrs are restore in ia64_old_stack.
773 ld8 temp3=[temp1],PT(F6)-PT(AR_CCV) // restore ar.ccv
774 ld8 temp4=[temp2],PT(F7)-PT(AR_FPSR) // restore ar.fpsr
778 ldf.fill f6=[temp1],PT(F8)-PT(F6)
779 ldf.fill f7=[temp2],PT(F9)-PT(F7)
781 ldf.fill f8=[temp1],PT(F10)-PT(F8)
782 ldf.fill f9=[temp2],PT(F11)-PT(F9)
787 // Restore the SAL to OS state. The previous code left regs at pt_regs.
788 add regs=MCA_SOS_OFFSET-MCA_PT_REGS_OFFSET, regs
790 add temp1=SOS(SAL_RA), regs
791 add temp2=SOS(SAL_GP), regs
793 ld8 r12=[temp1],16 // sal_ra
794 ld8 r9=[temp2],16 // sal_gp
796 ld8 r22=[temp1],16 // pal_min_state, virtual
797 ld8 r13=[temp2],16 // prev_IA64_KR_CURRENT
799 ld8 r16=[temp1],16 // prev_IA64_KR_CURRENT_STACK
800 ld8 r20=[temp2],16 // prev_task
802 ld8 temp3=[temp1],16 // cr.isr
803 ld8 temp4=[temp2],16 // cr.ifa
807 ld8 temp3=[temp1],16 // cr.itir
808 ld8 temp4=[temp2],16 // cr.iipa
812 ld8 temp3=[temp1] // cr.iim
813 ld8 temp4=[temp2] // cr.iha
814 add temp1=SOS(OS_STATUS), regs
815 add temp2=SOS(CONTEXT), regs
819 dep r22=0,r22,62,1 // pal_min_state, physical, uncached
820 mov IA64_KR(CURRENT)=r13
821 ld8 r8=[temp1] // os_status
822 ld8 r10=[temp2] // context
824 /* Wire IA64_TR_CURRENT_STACK to the stack that we are resuming to. To
825 * avoid any dependencies on the algorithm in ia64_switch_to(), just
826 * purge any existing CURRENT_STACK mapping and insert the new one.
828 * r16 contains prev_IA64_KR_CURRENT_STACK, r13 contains
829 * prev_IA64_KR_CURRENT, these values may have been changed by the C
830 * code. Do not use r8, r9, r10, r22, they contain values ready for
834 mov r15=IA64_KR(CURRENT_STACK) // physical granule mapped by IA64_TR_CURRENT_STACK
836 shl r15=r15,IA64_GRANULE_SHIFT
838 dep r15=-1,r15,61,3 // virtual granule
839 mov r18=IA64_GRANULE_SHIFT<<2 // for cr.itir.ps
845 extr.u r19=r13,61,3 // r13 = prev_IA64_KR_CURRENT
846 shl r20=r16,IA64_GRANULE_SHIFT // r16 = prev_IA64_KR_CURRENT_STACK
847 movl r21=PAGE_KERNEL // page properties
849 mov IA64_KR(CURRENT_STACK)=r16
850 cmp.ne p6,p0=RGN_KERNEL,r19 // new stack is in the kernel region?
851 or r21=r20,r21 // construct PA | page properties
852 (p6) br.spnt 1f // the dreaded cpu 0 idle task in region 5:(
856 mov r20=IA64_TR_CURRENT_STACK
865 //EndStub//////////////////////////////////////////////////////////////////////
874 // Switch to the MCA/INIT stack.
876 // r2 contains the return address, r3 contains either
877 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
879 // On entry RBS is still on the original stack, this routine switches RBS
880 // to use the MCA/INIT stack.
882 // On entry, sos->pal_min_state is physical, on exit it is virtual.
887 add regs=MCA_PT_REGS_OFFSET, r3
888 add temp2=MCA_SOS_OFFSET+SOS(PAL_MIN_STATE), r3
889 mov b0=r2 // save return address
890 GET_IA64_MCA_DATA(temp1)
893 add temp2=temp2, temp1 // struct ia64_sal_os_state.pal_min_state on MCA or INIT stack
894 add regs=regs, temp1 // struct pt_regs on MCA or INIT stack
896 // Address of minstate area provided by PAL is physical, uncacheable.
897 // Convert to Linux virtual address in region 6 for C code.
898 ld8 ms=[temp2] // pal_min_state, physical
900 dep temp1=-1,ms,62,2 // set region 6
901 mov temp3=IA64_RBS_OFFSET-MCA_PT_REGS_OFFSET
903 st8 [temp2]=temp1 // pal_min_state, virtual
905 add temp4=temp3, regs // start of bspstore on new stack
907 mov ar.bspstore=temp4 // switch RBS to MCA/INIT stack
909 flushrs // must be first in group
912 //EndStub//////////////////////////////////////////////////////////////////////
921 // Switch to the old stack.
923 // r2 contains the return address, r3 contains either
924 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
926 // On entry, pal_min_state is virtual, on exit it is physical.
928 // On entry RBS is on the MCA/INIT stack, this routine switches RBS
929 // back to the previous stack.
931 // The psr is set to all zeroes. SAL return requires either all zeroes or
932 // just psr.mc set. Leaving psr.mc off allows INIT to be issued if this
933 // code does not perform correctly.
935 // The dirty registers at the time of the event were flushed to the
936 // MCA/INIT stack in ia64_pt_regs_save(). Restore the dirty registers
937 // before reverting to the previous bspstore.
941 add regs=MCA_PT_REGS_OFFSET, r3
942 mov b0=r2 // save return address
943 GET_IA64_MCA_DATA(temp2)
944 LOAD_PHYSICAL(p0,temp1,1f)
954 add regs=regs, temp2 // struct pt_regs on MCA or INIT stack
956 add temp1=PT(LOADRS), regs
958 ld8 temp2=[temp1],PT(AR_BSPSTORE)-PT(LOADRS) // restore loadrs
960 ld8 temp3=[temp1],PT(AR_RNAT)-PT(AR_BSPSTORE) // restore ar.bspstore
964 ld8 temp4=[temp1] // restore ar.rnat
966 mov ar.bspstore=temp3 // back to old stack
973 //EndStub//////////////////////////////////////////////////////////////////////
978 // ia64_set_kernel_registers()
982 // Set the registers that are required by the C code in order to run on an
985 // r2 contains the return address, r3 contains either
986 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
990 ia64_set_kernel_registers:
991 add temp3=MCA_SP_OFFSET, r3
992 mov b0=r2 // save return address
993 GET_IA64_MCA_DATA(temp1)
995 add r12=temp1, temp3 // kernel stack pointer on MCA/INIT stack
996 add r13=temp1, r3 // set current to start of MCA/INIT stack
997 add r20=temp1, r3 // physical start of MCA/INIT stack
999 DATA_PA_TO_VA(r12,temp2)
1000 DATA_PA_TO_VA(r13,temp3)
1002 mov IA64_KR(CURRENT)=r13
1004 /* Wire IA64_TR_CURRENT_STACK to the MCA/INIT handler stack. To avoid
1005 * any dependencies on the algorithm in ia64_switch_to(), just purge
1006 * any existing CURRENT_STACK mapping and insert the new one.
1009 mov r16=IA64_KR(CURRENT_STACK) // physical granule mapped by IA64_TR_CURRENT_STACK
1011 shl r16=r16,IA64_GRANULE_SHIFT
1013 dep r16=-1,r16,61,3 // virtual granule
1014 mov r18=IA64_GRANULE_SHIFT<<2 // for cr.itir.ps
1020 shr.u r16=r20,IA64_GRANULE_SHIFT // r20 = physical start of MCA/INIT stack
1021 movl r21=PAGE_KERNEL // page properties
1023 mov IA64_KR(CURRENT_STACK)=r16
1024 or r21=r20,r21 // construct PA | page properties
1028 mov r20=IA64_TR_CURRENT_STACK
1030 movl r17=FPSR_DEFAULT
1032 mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
1040 //EndStub//////////////////////////////////////////////////////////////////////
1050 // Support function for mca.c, it is here to avoid using inline asm. Given the
1051 // address of an rnat slot, if that address is below the current ar.bspstore
1052 // then return the contents of that slot, otherwise return the contents of
1054 GLOBAL_ENTRY(ia64_get_rnat)
1055 alloc r14=ar.pfs,1,0,0,0
1060 cmp.lt p6,p7=in0,r14