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 // 2. Purge DTR for PERCPU data.
106 mov r18=PERCPU_PAGE_SHIFT<<2
112 // 3. Purge ITR for PAL code.
113 GET_THIS_PADDR(r2, ia64_mca_pal_base)
116 mov r18=IA64_GRANULE_SHIFT<<2
122 // 4. Purge DTR for stack.
123 mov r16=IA64_KR(CURRENT_STACK)
125 shl r16=r16,IA64_GRANULE_SHIFT
129 mov r18=IA64_GRANULE_SHIFT<<2
135 // Now branch away to caller.
139 //EndMain//////////////////////////////////////////////////////////////////////
141 //StartMain////////////////////////////////////////////////////////////////////
143 ia64_os_mca_dispatch:
144 // Serialize all MCA processing
146 LOAD_PHYSICAL(p0,r2,ia64_mca_serialize);;
150 (p6) br ia64_os_mca_spin
152 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
153 LOAD_PHYSICAL(p0,r2,1f) // return address
154 mov r19=1 // All MCA events are treated as monarch (for now)
155 br.sptk ia64_state_save // save the state that is not in minstate
158 GET_IA64_MCA_DATA(r2)
159 // Using MCA stack, struct ia64_sal_os_state, variable proc_state_param
161 add r3=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET+SOS(PROC_STATE_PARAM), r2
163 ld8 r18=[r3] // Get processor state parameter on existing PALE_CHECK.
166 (p7) br.spnt done_tlb_purge_and_reload
168 // The following code purges TC and TR entries. Then reload all TC entries.
169 // Purge percpu data TC entries.
170 begin_tlb_purge_and_reload:
171 movl r18=ia64_reload_tr;;
172 LOAD_PHYSICAL(p0,r18,ia64_reload_tr);;
174 br.sptk.many ia64_do_tlb_purge;;
177 // Finally reload the TR registers.
178 // 1. Reload DTR/ITR registers for kernel.
179 mov r18=KERNEL_TR_PAGE_SHIFT<<2
180 movl r17=KERNEL_START
184 mov r16=IA64_TR_KERNEL
188 dep r17=0,r19,0, KERNEL_TR_PAGE_SHIFT
199 // 2. Reload DTR register for PERCPU data.
200 GET_THIS_PADDR(r2, ia64_mca_per_cpu_pte)
202 movl r16=PERCPU_ADDR // vaddr
203 movl r18=PERCPU_PAGE_SHIFT<<2
208 ld8 r18=[r2] // load per-CPU PTE
209 mov r16=IA64_TR_PERCPU_DATA;
215 // 3. Reload ITR for PAL code.
216 GET_THIS_PADDR(r2, ia64_mca_pal_pte)
218 ld8 r18=[r2] // load PAL PTE
220 GET_THIS_PADDR(r2, ia64_mca_pal_base)
222 ld8 r16=[r2] // load PAL vaddr
223 mov r19=IA64_GRANULE_SHIFT<<2
227 mov r20=IA64_TR_PALCODE
233 // 4. Reload DTR for stack.
234 mov r16=IA64_KR(CURRENT_STACK)
236 shl r16=r16,IA64_GRANULE_SHIFT
243 mov r19=IA64_GRANULE_SHIFT<<2
247 mov r20=IA64_TR_CURRENT_STACK
253 done_tlb_purge_and_reload:
255 // switch to per cpu MCA stack
256 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
257 LOAD_PHYSICAL(p0,r2,1f) // return address
258 br.sptk ia64_new_stack
261 // everything saved, now we can set the kernel registers
262 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
263 LOAD_PHYSICAL(p0,r2,1f) // return address
264 br.sptk ia64_set_kernel_registers
267 // This must be done in physical mode
268 GET_IA64_MCA_DATA(r2)
272 // Enter virtual mode from physical mode
273 VIRTUAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_begin, r4)
275 // This code returns to SAL via SOS r2, in general SAL has no unwind
276 // data. To get a clean termination when backtracing the C MCA/INIT
277 // handler, set a dummy return address of 0 in this routine. That
278 // requires that ia64_os_mca_virtual_begin be a global function.
279 ENTRY(ia64_os_mca_virtual_begin)
284 mov ar.rsc=3 // set eager mode for C handler
285 mov r2=r7 // see GET_IA64_MCA_DATA above
288 // Call virtual mode handler
289 alloc r14=ar.pfs,0,0,3,0
293 add out0=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
294 add out1=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
295 add out2=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET, r2
296 br.call.sptk.many b0=ia64_mca_handler
298 // Revert back to physical mode before going back to SAL
299 PHYSICAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_end, r4)
300 ia64_os_mca_virtual_end:
302 END(ia64_os_mca_virtual_begin)
304 // switch back to previous stack
305 alloc r14=ar.pfs,0,0,0,0 // remove the MCA handler frame
306 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
307 LOAD_PHYSICAL(p0,r2,1f) // return address
308 br.sptk ia64_old_stack
311 mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET // use the MCA stack
312 LOAD_PHYSICAL(p0,r2,1f) // return address
313 br.sptk ia64_state_restore // restore the SAL state
316 mov b0=r12 // SAL_CHECK return address
319 LOAD_PHYSICAL(p0,r3,ia64_mca_serialize);;
324 //EndMain//////////////////////////////////////////////////////////////////////
326 //StartMain////////////////////////////////////////////////////////////////////
329 // SAL to OS entry point for INIT on all processors. This has been defined for
330 // registration purposes with SAL as a part of ia64_mca_init. Monarch and
331 // slave INIT have identical processing, except for the value of the
332 // sos->monarch flag in r19.
335 ia64_os_init_dispatch_monarch:
336 mov r19=1 // Bow, bow, ye lower middle classes!
337 br.sptk ia64_os_init_dispatch
339 ia64_os_init_dispatch_slave:
340 mov r19=0 // <igor>yeth, mathter</igor>
342 ia64_os_init_dispatch:
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_state_save // save the state that is not in minstate
349 // switch to per cpu INIT stack
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_new_stack
355 // everything saved, now we can set the kernel registers
356 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
357 LOAD_PHYSICAL(p0,r2,1f) // return address
358 br.sptk ia64_set_kernel_registers
361 // This must be done in physical mode
362 GET_IA64_MCA_DATA(r2)
366 // Enter virtual mode from physical mode
367 VIRTUAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_begin, r4)
369 // This code returns to SAL via SOS r2, in general SAL has no unwind
370 // data. To get a clean termination when backtracing the C MCA/INIT
371 // handler, set a dummy return address of 0 in this routine. That
372 // requires that ia64_os_init_virtual_begin be a global function.
373 ENTRY(ia64_os_init_virtual_begin)
378 mov ar.rsc=3 // set eager mode for C handler
379 mov r2=r7 // see GET_IA64_MCA_DATA above
382 // Call virtual mode handler
383 alloc r14=ar.pfs,0,0,3,0
387 add out0=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
388 add out1=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
389 add out2=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SOS_OFFSET, r2
390 br.call.sptk.many b0=ia64_init_handler
392 // Revert back to physical mode before going back to SAL
393 PHYSICAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_end, r4)
394 ia64_os_init_virtual_end:
396 END(ia64_os_init_virtual_begin)
398 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
399 LOAD_PHYSICAL(p0,r2,1f) // return address
400 br.sptk ia64_state_restore // restore the SAL state
403 // switch back to previous stack
404 alloc r14=ar.pfs,0,0,0,0 // remove the INIT handler frame
405 mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET // use the INIT stack
406 LOAD_PHYSICAL(p0,r2,1f) // return address
407 br.sptk ia64_old_stack
410 mov b0=r12 // SAL_CHECK return address
413 //EndMain//////////////////////////////////////////////////////////////////////
415 // common defines for the stubs
418 #define temp1 r2 /* careful, it overlaps with input registers */
419 #define temp2 r3 /* careful, it overlaps with input registers */
430 // Save the state that is not in minstate. This is sensitive to the layout of
431 // struct ia64_sal_os_state in mca.h.
433 // r2 contains the return address, r3 contains either
434 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
436 // The OS to SAL section of struct ia64_sal_os_state is set to a default
437 // value of cold boot (MCA) or warm boot (INIT) and return to the same
438 // context. ia64_sal_os_state is also used to hold some registers that
439 // need to be saved and restored across the stack switches.
441 // Most input registers to this stub come from PAL/SAL
442 // r1 os gp, physical
443 // r8 pal_proc entry point
444 // r9 sal_proc entry point
446 // r11 MCA - rendevzous state, INIT - reason code
447 // r12 sal return address
449 // r18 processor state parameter
450 // r19 monarch flag, set by the caller of this routine
452 // In addition to the SAL to OS state, this routine saves all the
453 // registers that appear in struct pt_regs and struct switch_stack,
454 // excluding those that are already in the PAL minstate area. This
455 // results in a partial pt_regs and switch_stack, the C code copies the
456 // remaining registers from PAL minstate to pt_regs and switch_stack. The
457 // resulting structures contain all the state of the original process when
458 // MCA/INIT occurred.
463 add regs=MCA_SOS_OFFSET, r3
464 add ms=MCA_SOS_OFFSET+8, r3
465 mov b0=r2 // save return address
466 cmp.eq p1,p2=IA64_MCA_CPU_MCA_STACK_OFFSET, r3
468 GET_IA64_MCA_DATA(temp2)
470 add temp1=temp2, regs // struct ia64_sal_os_state on MCA or INIT stack
471 add temp2=temp2, ms // struct ia64_sal_os_state+8 on MCA or INIT stack
473 mov regs=temp1 // save the start of sos
474 st8 [temp1]=r1,16 // os_gp
475 st8 [temp2]=r8,16 // pal_proc
477 st8 [temp1]=r9,16 // sal_proc
478 st8 [temp2]=r11,16 // rv_rc
481 st8 [temp1]=r18 // proc_state_param
482 st8 [temp2]=r19 // monarch
483 mov r6=IA64_KR(CURRENT)
484 add temp1=SOS(SAL_RA), regs
485 add temp2=SOS(SAL_GP), regs
487 st8 [temp1]=r12,16 // sal_ra
488 st8 [temp2]=r10,16 // sal_gp
491 st8 [temp1]=r17,16 // pal_min_state
492 st8 [temp2]=r6,16 // prev_IA64_KR_CURRENT
493 mov r6=IA64_KR(CURRENT_STACK)
495 st8 [temp1]=r6,16 // prev_IA64_KR_CURRENT_STACK
496 st8 [temp2]=r0,16 // prev_task, starts off as NULL
499 st8 [temp1]=r12,16 // cr.isr
500 st8 [temp2]=r6,16 // cr.ifa
503 st8 [temp1]=r12,16 // cr.itir
504 st8 [temp2]=r11,16 // cr.iipa
507 st8 [temp1]=r12 // cr.iim
508 (p1) mov r12=IA64_MCA_COLD_BOOT
509 (p2) mov r12=IA64_INIT_WARM_BOOT
511 add temp1=SOS(OS_STATUS), regs
513 st8 [temp2]=r6 // cr.iha
514 add temp2=SOS(CONTEXT), regs
515 st8 [temp1]=r12 // os_status, default is cold boot
516 mov r6=IA64_MCA_SAME_CONTEXT
518 st8 [temp2]=r6 // context, default is same context
520 // Save the pt_regs data that is not in minstate. The previous code
522 add regs=MCA_PT_REGS_OFFSET-MCA_SOS_OFFSET, regs
524 add temp1=PT(B6), regs
527 add temp2=PT(B7), regs
529 st8 [temp1]=temp3,PT(AR_CSD)-PT(B6) // save b6
530 st8 [temp2]=temp4,PT(AR_SSD)-PT(B7) // save b7
533 cover // must be last in group
535 st8 [temp1]=temp3,PT(AR_UNAT)-PT(AR_CSD) // save ar.csd
536 st8 [temp2]=temp4,PT(AR_PFS)-PT(AR_SSD) // save ar.ssd
540 st8 [temp1]=temp3,PT(AR_RNAT)-PT(AR_UNAT) // save ar.unat
541 st8 [temp2]=temp4,PT(AR_BSPSTORE)-PT(AR_PFS) // save ar.pfs
543 mov temp4=ar.bspstore
545 st8 [temp1]=temp3,PT(LOADRS)-PT(AR_RNAT) // save ar.rnat
546 st8 [temp2]=temp4,PT(AR_FPSR)-PT(AR_BSPSTORE) // save ar.bspstore
549 sub temp3=temp3, temp4 // ar.bsp - ar.bspstore
552 shl temp3=temp3,16 // compute ar.rsc to be used for "loadrs"
554 st8 [temp1]=temp3,PT(AR_CCV)-PT(LOADRS) // save loadrs
555 st8 [temp2]=temp4,PT(F6)-PT(AR_FPSR) // save ar.fpsr
558 st8 [temp1]=temp3,PT(F7)-PT(AR_CCV) // save ar.ccv
559 stf.spill [temp2]=f6,PT(F8)-PT(F6)
561 stf.spill [temp1]=f7,PT(F9)-PT(F7)
562 stf.spill [temp2]=f8,PT(F10)-PT(F8)
564 stf.spill [temp1]=f9,PT(F11)-PT(F9)
565 stf.spill [temp2]=f10
567 stf.spill [temp1]=f11
569 // Save the switch_stack data that is not in minstate nor pt_regs. The
570 // previous code left regs at pt_regs.
571 add regs=MCA_SWITCH_STACK_OFFSET-MCA_PT_REGS_OFFSET, regs
573 add temp1=SW(F2), regs
574 add temp2=SW(F3), regs
576 stf.spill [temp1]=f2,32
577 stf.spill [temp2]=f3,32
579 stf.spill [temp1]=f4,32
580 stf.spill [temp2]=f5,32
582 stf.spill [temp1]=f12,32
583 stf.spill [temp2]=f13,32
585 stf.spill [temp1]=f14,32
586 stf.spill [temp2]=f15,32
588 stf.spill [temp1]=f16,32
589 stf.spill [temp2]=f17,32
591 stf.spill [temp1]=f18,32
592 stf.spill [temp2]=f19,32
594 stf.spill [temp1]=f20,32
595 stf.spill [temp2]=f21,32
597 stf.spill [temp1]=f22,32
598 stf.spill [temp2]=f23,32
600 stf.spill [temp1]=f24,32
601 stf.spill [temp2]=f25,32
603 stf.spill [temp1]=f26,32
604 stf.spill [temp2]=f27,32
606 stf.spill [temp1]=f28,32
607 stf.spill [temp2]=f29,32
609 stf.spill [temp1]=f30,SW(B2)-SW(F30)
610 stf.spill [temp2]=f31,SW(B3)-SW(F31)
614 st8 [temp1]=temp3,16 // save b2
615 st8 [temp2]=temp4,16 // save b3
619 st8 [temp1]=temp3,SW(AR_LC)-SW(B4) // save b4
620 st8 [temp2]=temp4 // save b5
623 st8 [temp1]=temp3 // save ar.lc
625 // FIXME: Some proms are incorrectly accessing the minstate area as
626 // cached data. The C code uses region 6, uncached virtual. Ensure
627 // that there is no cache data lying around for the first 1K of the
629 // Remove this code in September 2006, that gives platforms a year to
630 // fix their proms and get their customers updated.
702 //EndStub//////////////////////////////////////////////////////////////////////
707 // ia64_state_restore()
711 // Restore the SAL/OS state. This is sensitive to the layout of struct
712 // ia64_sal_os_state in mca.h.
714 // r2 contains the return address, r3 contains either
715 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
717 // In addition to the SAL to OS state, this routine restores all the
718 // registers that appear in struct pt_regs and struct switch_stack,
719 // excluding those in the PAL minstate area.
724 // Restore the switch_stack data that is not in minstate nor pt_regs.
725 add regs=MCA_SWITCH_STACK_OFFSET, r3
726 mov b0=r2 // save return address
728 GET_IA64_MCA_DATA(temp2)
732 add temp1=SW(F2), regs
733 add temp2=SW(F3), regs
735 ldf.fill f2=[temp1],32
736 ldf.fill f3=[temp2],32
738 ldf.fill f4=[temp1],32
739 ldf.fill f5=[temp2],32
741 ldf.fill f12=[temp1],32
742 ldf.fill f13=[temp2],32
744 ldf.fill f14=[temp1],32
745 ldf.fill f15=[temp2],32
747 ldf.fill f16=[temp1],32
748 ldf.fill f17=[temp2],32
750 ldf.fill f18=[temp1],32
751 ldf.fill f19=[temp2],32
753 ldf.fill f20=[temp1],32
754 ldf.fill f21=[temp2],32
756 ldf.fill f22=[temp1],32
757 ldf.fill f23=[temp2],32
759 ldf.fill f24=[temp1],32
760 ldf.fill f25=[temp2],32
762 ldf.fill f26=[temp1],32
763 ldf.fill f27=[temp2],32
765 ldf.fill f28=[temp1],32
766 ldf.fill f29=[temp2],32
768 ldf.fill f30=[temp1],SW(B2)-SW(F30)
769 ldf.fill f31=[temp2],SW(B3)-SW(F31)
771 ld8 temp3=[temp1],16 // restore b2
772 ld8 temp4=[temp2],16 // restore b3
776 ld8 temp3=[temp1],SW(AR_LC)-SW(B4) // restore b4
777 ld8 temp4=[temp2] // restore b5
781 ld8 temp3=[temp1] // restore ar.lc
785 // Restore the pt_regs data that is not in minstate. The previous code
786 // left regs at switch_stack.
787 add regs=MCA_PT_REGS_OFFSET-MCA_SWITCH_STACK_OFFSET, regs
789 add temp1=PT(B6), regs
790 add temp2=PT(B7), regs
792 ld8 temp3=[temp1],PT(AR_CSD)-PT(B6) // restore b6
793 ld8 temp4=[temp2],PT(AR_SSD)-PT(B7) // restore b7
797 ld8 temp3=[temp1],PT(AR_UNAT)-PT(AR_CSD) // restore ar.csd
798 ld8 temp4=[temp2],PT(AR_PFS)-PT(AR_SSD) // restore ar.ssd
802 ld8 temp3=[temp1] // restore ar.unat
803 add temp1=PT(AR_CCV)-PT(AR_UNAT), temp1
804 ld8 temp4=[temp2],PT(AR_FPSR)-PT(AR_PFS) // restore ar.pfs
808 // ar.rnat, ar.bspstore, loadrs are restore in ia64_old_stack.
809 ld8 temp3=[temp1],PT(F6)-PT(AR_CCV) // restore ar.ccv
810 ld8 temp4=[temp2],PT(F7)-PT(AR_FPSR) // restore ar.fpsr
814 ldf.fill f6=[temp1],PT(F8)-PT(F6)
815 ldf.fill f7=[temp2],PT(F9)-PT(F7)
817 ldf.fill f8=[temp1],PT(F10)-PT(F8)
818 ldf.fill f9=[temp2],PT(F11)-PT(F9)
823 // Restore the SAL to OS state. The previous code left regs at pt_regs.
824 add regs=MCA_SOS_OFFSET-MCA_PT_REGS_OFFSET, regs
826 add temp1=SOS(SAL_RA), regs
827 add temp2=SOS(SAL_GP), regs
829 ld8 r12=[temp1],16 // sal_ra
830 ld8 r9=[temp2],16 // sal_gp
832 ld8 r22=[temp1],16 // pal_min_state, virtual
833 ld8 r13=[temp2],16 // prev_IA64_KR_CURRENT
835 ld8 r16=[temp1],16 // prev_IA64_KR_CURRENT_STACK
836 ld8 r20=[temp2],16 // prev_task
838 ld8 temp3=[temp1],16 // cr.isr
839 ld8 temp4=[temp2],16 // cr.ifa
843 ld8 temp3=[temp1],16 // cr.itir
844 ld8 temp4=[temp2],16 // cr.iipa
848 ld8 temp3=[temp1] // cr.iim
849 ld8 temp4=[temp2] // cr.iha
850 add temp1=SOS(OS_STATUS), regs
851 add temp2=SOS(CONTEXT), regs
855 dep r22=0,r22,62,1 // pal_min_state, physical, uncached
856 mov IA64_KR(CURRENT)=r13
857 ld8 r8=[temp1] // os_status
858 ld8 r10=[temp2] // context
860 /* Wire IA64_TR_CURRENT_STACK to the stack that we are resuming to. To
861 * avoid any dependencies on the algorithm in ia64_switch_to(), just
862 * purge any existing CURRENT_STACK mapping and insert the new one.
864 * r16 contains prev_IA64_KR_CURRENT_STACK, r13 contains
865 * prev_IA64_KR_CURRENT, these values may have been changed by the C
866 * code. Do not use r8, r9, r10, r22, they contain values ready for
870 mov r15=IA64_KR(CURRENT_STACK) // physical granule mapped by IA64_TR_CURRENT_STACK
872 shl r15=r15,IA64_GRANULE_SHIFT
874 dep r15=-1,r15,61,3 // virtual granule
875 mov r18=IA64_GRANULE_SHIFT<<2 // for cr.itir.ps
881 extr.u r19=r13,61,3 // r13 = prev_IA64_KR_CURRENT
882 shl r20=r16,IA64_GRANULE_SHIFT // r16 = prev_IA64_KR_CURRENT_STACK
883 movl r21=PAGE_KERNEL // page properties
885 mov IA64_KR(CURRENT_STACK)=r16
886 cmp.ne p6,p0=RGN_KERNEL,r19 // new stack is in the kernel region?
887 or r21=r20,r21 // construct PA | page properties
888 (p6) br.spnt 1f // the dreaded cpu 0 idle task in region 5:(
892 mov r20=IA64_TR_CURRENT_STACK
901 //EndStub//////////////////////////////////////////////////////////////////////
910 // Switch to the MCA/INIT stack.
912 // r2 contains the return address, r3 contains either
913 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
915 // On entry RBS is still on the original stack, this routine switches RBS
916 // to use the MCA/INIT stack.
918 // On entry, sos->pal_min_state is physical, on exit it is virtual.
923 add regs=MCA_PT_REGS_OFFSET, r3
924 add temp2=MCA_SOS_OFFSET+SOS(PAL_MIN_STATE), r3
925 mov b0=r2 // save return address
926 GET_IA64_MCA_DATA(temp1)
929 add temp2=temp2, temp1 // struct ia64_sal_os_state.pal_min_state on MCA or INIT stack
930 add regs=regs, temp1 // struct pt_regs on MCA or INIT stack
932 // Address of minstate area provided by PAL is physical, uncacheable.
933 // Convert to Linux virtual address in region 6 for C code.
934 ld8 ms=[temp2] // pal_min_state, physical
936 dep temp1=-1,ms,62,2 // set region 6
937 mov temp3=IA64_RBS_OFFSET-MCA_PT_REGS_OFFSET
939 st8 [temp2]=temp1 // pal_min_state, virtual
941 add temp4=temp3, regs // start of bspstore on new stack
943 mov ar.bspstore=temp4 // switch RBS to MCA/INIT stack
945 flushrs // must be first in group
948 //EndStub//////////////////////////////////////////////////////////////////////
957 // Switch to the old stack.
959 // r2 contains the return address, r3 contains either
960 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
962 // On entry, pal_min_state is virtual, on exit it is physical.
964 // On entry RBS is on the MCA/INIT stack, this routine switches RBS
965 // back to the previous stack.
967 // The psr is set to all zeroes. SAL return requires either all zeroes or
968 // just psr.mc set. Leaving psr.mc off allows INIT to be issued if this
969 // code does not perform correctly.
971 // The dirty registers at the time of the event were flushed to the
972 // MCA/INIT stack in ia64_pt_regs_save(). Restore the dirty registers
973 // before reverting to the previous bspstore.
977 add regs=MCA_PT_REGS_OFFSET, r3
978 mov b0=r2 // save return address
979 GET_IA64_MCA_DATA(temp2)
980 LOAD_PHYSICAL(p0,temp1,1f)
990 add regs=regs, temp2 // struct pt_regs on MCA or INIT stack
992 add temp1=PT(LOADRS), regs
994 ld8 temp2=[temp1],PT(AR_BSPSTORE)-PT(LOADRS) // restore loadrs
996 ld8 temp3=[temp1],PT(AR_RNAT)-PT(AR_BSPSTORE) // restore ar.bspstore
1000 ld8 temp4=[temp1] // restore ar.rnat
1002 mov ar.bspstore=temp3 // back to old stack
1009 //EndStub//////////////////////////////////////////////////////////////////////
1014 // ia64_set_kernel_registers()
1016 // Stub Description:
1018 // Set the registers that are required by the C code in order to run on an
1021 // r2 contains the return address, r3 contains either
1022 // IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
1026 ia64_set_kernel_registers:
1027 add temp3=MCA_SP_OFFSET, r3
1028 add temp4=MCA_SOS_OFFSET+SOS(OS_GP), r3
1029 mov b0=r2 // save return address
1030 GET_IA64_MCA_DATA(temp1)
1032 add temp4=temp4, temp1 // &struct ia64_sal_os_state.os_gp
1033 add r12=temp1, temp3 // kernel stack pointer on MCA/INIT stack
1034 add r13=temp1, r3 // set current to start of MCA/INIT stack
1035 add r20=temp1, r3 // physical start of MCA/INIT stack
1037 ld8 r1=[temp4] // OS GP from SAL OS state
1039 DATA_PA_TO_VA(r1,temp1)
1040 DATA_PA_TO_VA(r12,temp2)
1041 DATA_PA_TO_VA(r13,temp3)
1043 mov IA64_KR(CURRENT)=r13
1045 /* Wire IA64_TR_CURRENT_STACK to the MCA/INIT handler stack. To avoid
1046 * any dependencies on the algorithm in ia64_switch_to(), just purge
1047 * any existing CURRENT_STACK mapping and insert the new one.
1050 mov r16=IA64_KR(CURRENT_STACK) // physical granule mapped by IA64_TR_CURRENT_STACK
1052 shl r16=r16,IA64_GRANULE_SHIFT
1054 dep r16=-1,r16,61,3 // virtual granule
1055 mov r18=IA64_GRANULE_SHIFT<<2 // for cr.itir.ps
1061 shr.u r16=r20,IA64_GRANULE_SHIFT // r20 = physical start of MCA/INIT stack
1062 movl r21=PAGE_KERNEL // page properties
1064 mov IA64_KR(CURRENT_STACK)=r16
1065 or r21=r20,r21 // construct PA | page properties
1069 mov r20=IA64_TR_CURRENT_STACK
1077 //EndStub//////////////////////////////////////////////////////////////////////
1087 // Support function for mca.c, it is here to avoid using inline asm. Given the
1088 // address of an rnat slot, if that address is below the current ar.bspstore
1089 // then return the contents of that slot, otherwise return the contents of
1091 GLOBAL_ENTRY(ia64_get_rnat)
1092 alloc r14=ar.pfs,1,0,0,0
1097 cmp.lt p6,p7=in0,r14