2 * Here is where the ball gets rolling as far as the kernel is concerned.
3 * When control is transferred to _start, the bootload has already
4 * loaded us to the correct address. All that's left to do here is
5 * to set up the kernel's global pointer and jump to the kernel
8 * Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
9 * David Mosberger-Tang <davidm@hpl.hp.com>
10 * Stephane Eranian <eranian@hpl.hp.com>
11 * Copyright (C) 1999 VA Linux Systems
12 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
13 * Copyright (C) 1999 Intel Corp.
14 * Copyright (C) 1999 Asit Mallick <Asit.K.Mallick@intel.com>
15 * Copyright (C) 1999 Don Dugger <Don.Dugger@intel.com>
16 * Copyright (C) 2002 Fenghua Yu <fenghua.yu@intel.com>
17 * -Optimize __ia64_save_fpu() and __ia64_load_fpu() for Itanium 2.
18 * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
19 * Support for CPU Hotplug
23 #include <asm/asmmacro.h>
25 #include <asm/kregs.h>
26 #include <asm/mmu_context.h>
27 #include <asm/asm-offsets.h>
29 #include <asm/paravirt.h>
30 #include <asm/pgtable.h>
31 #include <asm/processor.h>
32 #include <asm/ptrace.h>
33 #include <asm/system.h>
34 #include <asm/mca_asm.h>
35 #include <linux/init.h>
36 #include <linux/linkage.h>
38 #ifdef CONFIG_HOTPLUG_CPU
39 #define SAL_PSR_BITS_TO_SET \
40 (IA64_PSR_AC | IA64_PSR_BN | IA64_PSR_MFH | IA64_PSR_MFL)
42 #define SAVE_FROM_REG(src, ptr, dest) \
46 #define RESTORE_REG(reg, ptr, _tmp) \
47 ld8 _tmp=[ptr],0x08;; \
50 #define SAVE_BREAK_REGS(ptr, _idx, _breg, _dest)\
51 mov ar.lc=IA64_NUM_DBG_REGS-1;; \
54 SAVE_FROM_REG(_breg[_idx], ptr, _dest);; \
58 #define RESTORE_BREAK_REGS(ptr, _idx, _breg, _tmp, _lbl)\
59 mov ar.lc=IA64_NUM_DBG_REGS-1;; \
61 _lbl: RESTORE_REG(_breg[_idx], ptr, _tmp);; \
63 br.cloop.sptk.many _lbl
65 #define SAVE_ONE_RR(num, _reg, _tmp) \
66 movl _tmp=(num<<61);; \
69 #define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
70 SAVE_ONE_RR(0,_r0, _tmp);; \
71 SAVE_ONE_RR(1,_r1, _tmp);; \
72 SAVE_ONE_RR(2,_r2, _tmp);; \
73 SAVE_ONE_RR(3,_r3, _tmp);; \
74 SAVE_ONE_RR(4,_r4, _tmp);; \
75 SAVE_ONE_RR(5,_r5, _tmp);; \
76 SAVE_ONE_RR(6,_r6, _tmp);; \
77 SAVE_ONE_RR(7,_r7, _tmp);;
79 #define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
89 #define RESTORE_REGION_REGS(ptr, _idx1, _idx2, _tmp) \
93 dep.z _idx2=_idx1,61,3;; \
95 mov rr[_idx2]=_tmp;; \
98 br.cloop.sptk.few RestRR
100 #define SET_AREA_FOR_BOOTING_CPU(reg1, reg2) \
101 movl reg1=sal_state_for_booting_cpu;; \
105 * Adjust region registers saved before starting to save
106 * break regs and rest of the states that need to be preserved.
108 #define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(_reg1,_reg2,_pred) \
109 SAVE_FROM_REG(b0,_reg1,_reg2);; \
110 SAVE_FROM_REG(b1,_reg1,_reg2);; \
111 SAVE_FROM_REG(b2,_reg1,_reg2);; \
112 SAVE_FROM_REG(b3,_reg1,_reg2);; \
113 SAVE_FROM_REG(b4,_reg1,_reg2);; \
114 SAVE_FROM_REG(b5,_reg1,_reg2);; \
115 st8 [_reg1]=r1,0x08;; \
116 st8 [_reg1]=r12,0x08;; \
117 st8 [_reg1]=r13,0x08;; \
118 SAVE_FROM_REG(ar.fpsr,_reg1,_reg2);; \
119 SAVE_FROM_REG(ar.pfs,_reg1,_reg2);; \
120 SAVE_FROM_REG(ar.rnat,_reg1,_reg2);; \
121 SAVE_FROM_REG(ar.unat,_reg1,_reg2);; \
122 SAVE_FROM_REG(ar.bspstore,_reg1,_reg2);; \
123 SAVE_FROM_REG(cr.dcr,_reg1,_reg2);; \
124 SAVE_FROM_REG(cr.iva,_reg1,_reg2);; \
125 SAVE_FROM_REG(cr.pta,_reg1,_reg2);; \
126 SAVE_FROM_REG(cr.itv,_reg1,_reg2);; \
127 SAVE_FROM_REG(cr.pmv,_reg1,_reg2);; \
128 SAVE_FROM_REG(cr.cmcv,_reg1,_reg2);; \
129 SAVE_FROM_REG(cr.lrr0,_reg1,_reg2);; \
130 SAVE_FROM_REG(cr.lrr1,_reg1,_reg2);; \
131 st8 [_reg1]=r4,0x08;; \
132 st8 [_reg1]=r5,0x08;; \
133 st8 [_reg1]=r6,0x08;; \
134 st8 [_reg1]=r7,0x08;; \
135 st8 [_reg1]=_pred,0x08;; \
136 SAVE_FROM_REG(ar.lc, _reg1, _reg2);; \
137 stf.spill.nta [_reg1]=f2,16;; \
138 stf.spill.nta [_reg1]=f3,16;; \
139 stf.spill.nta [_reg1]=f4,16;; \
140 stf.spill.nta [_reg1]=f5,16;; \
141 stf.spill.nta [_reg1]=f16,16;; \
142 stf.spill.nta [_reg1]=f17,16;; \
143 stf.spill.nta [_reg1]=f18,16;; \
144 stf.spill.nta [_reg1]=f19,16;; \
145 stf.spill.nta [_reg1]=f20,16;; \
146 stf.spill.nta [_reg1]=f21,16;; \
147 stf.spill.nta [_reg1]=f22,16;; \
148 stf.spill.nta [_reg1]=f23,16;; \
149 stf.spill.nta [_reg1]=f24,16;; \
150 stf.spill.nta [_reg1]=f25,16;; \
151 stf.spill.nta [_reg1]=f26,16;; \
152 stf.spill.nta [_reg1]=f27,16;; \
153 stf.spill.nta [_reg1]=f28,16;; \
154 stf.spill.nta [_reg1]=f29,16;; \
155 stf.spill.nta [_reg1]=f30,16;; \
156 stf.spill.nta [_reg1]=f31,16;;
159 #define SET_AREA_FOR_BOOTING_CPU(a1, a2)
160 #define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(a1,a2, a3)
161 #define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
162 #define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
165 #define SET_ONE_RR(num, pgsize, _tmp1, _tmp2, vhpt) \
166 movl _tmp1=(num << 61);; \
167 mov _tmp2=((ia64_rid(IA64_REGION_ID_KERNEL, (num<<61)) << 8) | (pgsize << 2) | vhpt);; \
170 .section __special_page_section,"ax"
172 .global empty_zero_page
176 .global swapper_pg_dir
182 stringz "Halting kernel\n"
184 .section .text.head,"ax"
189 * Start the kernel. When the bootloader passes control to _start(), r28
190 * points to the address of the boot parameter area. Execution reaches
191 * here in physical mode.
196 .save rp, r0 // terminate unwind chain with a NULL rp
204 flushrs // must be first insn in group
209 * Save the region registers, predicate before they get clobbered
211 SAVE_REGION_REGS(r2, r8,r9,r10,r11,r12,r13,r14,r15);
215 * Initialize kernel region registers:
216 * rr[0]: VHPT enabled, page size = PAGE_SHIFT
217 * rr[1]: VHPT enabled, page size = PAGE_SHIFT
218 * rr[2]: VHPT enabled, page size = PAGE_SHIFT
219 * rr[3]: VHPT enabled, page size = PAGE_SHIFT
220 * rr[4]: VHPT enabled, page size = PAGE_SHIFT
221 * rr[5]: VHPT enabled, page size = PAGE_SHIFT
222 * rr[6]: VHPT disabled, page size = IA64_GRANULE_SHIFT
223 * rr[7]: VHPT disabled, page size = IA64_GRANULE_SHIFT
224 * We initialize all of them to prevent inadvertently assuming
225 * something about the state of address translation early in boot.
227 SET_ONE_RR(0, PAGE_SHIFT, r2, r16, 1);;
228 SET_ONE_RR(1, PAGE_SHIFT, r2, r16, 1);;
229 SET_ONE_RR(2, PAGE_SHIFT, r2, r16, 1);;
230 SET_ONE_RR(3, PAGE_SHIFT, r2, r16, 1);;
231 SET_ONE_RR(4, PAGE_SHIFT, r2, r16, 1);;
232 SET_ONE_RR(5, PAGE_SHIFT, r2, r16, 1);;
233 SET_ONE_RR(6, IA64_GRANULE_SHIFT, r2, r16, 0);;
234 SET_ONE_RR(7, IA64_GRANULE_SHIFT, r2, r16, 0);;
236 * Now pin mappings into the TLB for kernel text and data
238 mov r18=KERNEL_TR_PAGE_SHIFT<<2
239 movl r17=KERNEL_START
243 mov r16=IA64_TR_KERNEL
247 dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT
260 * Switch into virtual mode:
262 movl r16=(IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN \
273 1: // now we are in virtual mode
275 SET_AREA_FOR_BOOTING_CPU(r2, r16);
277 STORE_REGION_REGS(r16, r8,r9,r10,r11,r12,r13,r14,r15);
278 SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(r16,r17,r25)
281 // set IVT entry point---can't access I/O ports without it
293 #define isAP p2 // are we an Application Processor?
294 #define isBP p3 // are we the Bootstrap Processor?
298 * Find the init_task for the currently booting CPU. At poweron, and in
299 * UP mode, task_for_booting_cpu is NULL.
301 movl r3=task_for_booting_cpu
306 cmp.eq isBP,isAP=r3,r0
311 cmp.eq isBP,isAP=r0,r0
314 tpa r3=r2 // r3 == phys addr of task struct
316 (isBP) br.cond.dpnt .load_current // BP stack is on region 5 --- no need to map it
318 // load mapping for stack (virtaddr in r2, physaddr in r3)
326 dep r2=-1,r3,61,3 // IMVA of task
329 shr.u r16=r3,IA64_GRANULE_SHIFT
336 mov r19=IA64_TR_CURRENT_STACK
345 // load the "current" pointer (r13) and ar.k6 with the current task
346 mov IA64_KR(CURRENT)=r2 // virtual address
347 mov IA64_KR(CURRENT_STACK)=r16
350 * Reserve space at the top of the stack for "struct pt_regs". Kernel
351 * threads don't store interesting values in that structure, but the space
352 * still needs to be there because time-critical stuff such as the context
353 * switching can be implemented more efficiently (for example, __switch_to()
354 * always sets the psr.dfh bit of the task it is switching to).
357 addl r12=IA64_STK_OFFSET-IA64_PT_REGS_SIZE-16,r2
358 addl r2=IA64_RBS_OFFSET,r2 // initialize the RSE
359 mov ar.rsc=0 // place RSE in enforced lazy mode
361 loadrs // clear the dirty partition
362 movl r19=__phys_per_cpu_start
363 mov r18=PERCPU_PAGE_SIZE
379 (p7) br.cond.dptk.few 1b
384 .pred.rel.mutex isBP,isAP
385 (isBP) mov IA64_KR(PER_CPU_DATA)=r19 // per-CPU base for cpu0
386 (isAP) mov IA64_KR(PER_CPU_DATA)=r0 // clear physical per-CPU base
388 mov ar.bspstore=r2 // establish the new RSE stack
390 mov ar.rsc=0x3 // place RSE in eager mode
392 (isBP) dep r28=-1,r28,61,3 // make address virtual
393 (isBP) movl r2=ia64_boot_param
395 (isBP) st8 [r2]=r28 // save the address of the boot param area passed by the bootloader
397 #ifdef CONFIG_PARAVIRT
399 movl r14=hypervisor_setup_hooks
400 movl r15=hypervisor_type
401 mov r16=num_hypervisor_hooks
405 cmp.ltu p7,p0=r2,r16 // array size check
411 (p7) cmp.ne.unc p7,p0=r9,r0 // no actual branch to NULL
413 (p7) br.call.sptk.many rp=b1
417 default_setup_hook = 0 // Currently nothing needs to be done.
421 .global hypervisor_type
423 data8 PARAVIRT_HYPERVISOR_TYPE_DEFAULT
425 // must have the same order with PARAVIRT_HYPERVISOR_TYPE_xxx
427 hypervisor_setup_hooks:
428 data8 default_setup_hook
430 num_hypervisor_hooks = (. - hypervisor_setup_hooks) / 8
436 (isAP) br.call.sptk.many rp=start_secondary
438 (isAP) br.cond.sptk self
441 // This is executed by the bootstrap processor (bsp) only:
443 #ifdef CONFIG_IA64_FW_EMU
444 // initialize PAL & SAL emulator:
445 br.call.sptk.many rp=sys_fw_init
448 br.call.sptk.many rp=start_kernel
449 .ret2: addl r3=@ltoff(halt_msg),gp
451 alloc r2=ar.pfs,8,0,2,0
454 br.call.sptk.many b0=console_print
457 br.sptk.many self // endless loop
462 GLOBAL_ENTRY(ia64_save_debug_regs)
463 alloc r16=ar.pfs,1,0,0,0
464 mov r20=ar.lc // preserve ar.lc
465 mov ar.lc=IA64_NUM_DBG_REGS-1
467 add r19=IA64_NUM_DBG_REGS*8,in0
470 #ifdef CONFIG_ITANIUM
479 br.cloop.sptk.many 1b
481 mov ar.lc=r20 // restore ar.lc
483 END(ia64_save_debug_regs)
485 GLOBAL_ENTRY(ia64_load_debug_regs)
486 alloc r16=ar.pfs,1,0,0,0
488 mov r20=ar.lc // preserve ar.lc
489 add r19=IA64_NUM_DBG_REGS*8,in0
490 mov ar.lc=IA64_NUM_DBG_REGS-1
493 1: ld8.nta r16=[in0],8
498 #ifdef CONFIG_ITANIUM
500 srlz.d // Errata 132 (NoFix status)
503 br.cloop.sptk.many 1b
505 mov ar.lc=r20 // restore ar.lc
507 END(ia64_load_debug_regs)
509 GLOBAL_ENTRY(__ia64_save_fpu)
510 alloc r2=ar.pfs,1,4,0,0
511 adds loc0=96*16-16,in0
512 adds loc1=96*16-16-128,in0
514 stf.spill.nta [loc0]=f127,-256
515 stf.spill.nta [loc1]=f119,-256
517 stf.spill.nta [loc0]=f111,-256
518 stf.spill.nta [loc1]=f103,-256
520 stf.spill.nta [loc0]=f95,-256
521 stf.spill.nta [loc1]=f87,-256
523 stf.spill.nta [loc0]=f79,-256
524 stf.spill.nta [loc1]=f71,-256
526 stf.spill.nta [loc0]=f63,-256
527 stf.spill.nta [loc1]=f55,-256
528 adds loc2=96*16-32,in0
530 stf.spill.nta [loc0]=f47,-256
531 stf.spill.nta [loc1]=f39,-256
532 adds loc3=96*16-32-128,in0
534 stf.spill.nta [loc2]=f126,-256
535 stf.spill.nta [loc3]=f118,-256
537 stf.spill.nta [loc2]=f110,-256
538 stf.spill.nta [loc3]=f102,-256
540 stf.spill.nta [loc2]=f94,-256
541 stf.spill.nta [loc3]=f86,-256
543 stf.spill.nta [loc2]=f78,-256
544 stf.spill.nta [loc3]=f70,-256
546 stf.spill.nta [loc2]=f62,-256
547 stf.spill.nta [loc3]=f54,-256
548 adds loc0=96*16-48,in0
550 stf.spill.nta [loc2]=f46,-256
551 stf.spill.nta [loc3]=f38,-256
552 adds loc1=96*16-48-128,in0
554 stf.spill.nta [loc0]=f125,-256
555 stf.spill.nta [loc1]=f117,-256
557 stf.spill.nta [loc0]=f109,-256
558 stf.spill.nta [loc1]=f101,-256
560 stf.spill.nta [loc0]=f93,-256
561 stf.spill.nta [loc1]=f85,-256
563 stf.spill.nta [loc0]=f77,-256
564 stf.spill.nta [loc1]=f69,-256
566 stf.spill.nta [loc0]=f61,-256
567 stf.spill.nta [loc1]=f53,-256
568 adds loc2=96*16-64,in0
570 stf.spill.nta [loc0]=f45,-256
571 stf.spill.nta [loc1]=f37,-256
572 adds loc3=96*16-64-128,in0
574 stf.spill.nta [loc2]=f124,-256
575 stf.spill.nta [loc3]=f116,-256
577 stf.spill.nta [loc2]=f108,-256
578 stf.spill.nta [loc3]=f100,-256
580 stf.spill.nta [loc2]=f92,-256
581 stf.spill.nta [loc3]=f84,-256
583 stf.spill.nta [loc2]=f76,-256
584 stf.spill.nta [loc3]=f68,-256
586 stf.spill.nta [loc2]=f60,-256
587 stf.spill.nta [loc3]=f52,-256
588 adds loc0=96*16-80,in0
590 stf.spill.nta [loc2]=f44,-256
591 stf.spill.nta [loc3]=f36,-256
592 adds loc1=96*16-80-128,in0
594 stf.spill.nta [loc0]=f123,-256
595 stf.spill.nta [loc1]=f115,-256
597 stf.spill.nta [loc0]=f107,-256
598 stf.spill.nta [loc1]=f99,-256
600 stf.spill.nta [loc0]=f91,-256
601 stf.spill.nta [loc1]=f83,-256
603 stf.spill.nta [loc0]=f75,-256
604 stf.spill.nta [loc1]=f67,-256
606 stf.spill.nta [loc0]=f59,-256
607 stf.spill.nta [loc1]=f51,-256
608 adds loc2=96*16-96,in0
610 stf.spill.nta [loc0]=f43,-256
611 stf.spill.nta [loc1]=f35,-256
612 adds loc3=96*16-96-128,in0
614 stf.spill.nta [loc2]=f122,-256
615 stf.spill.nta [loc3]=f114,-256
617 stf.spill.nta [loc2]=f106,-256
618 stf.spill.nta [loc3]=f98,-256
620 stf.spill.nta [loc2]=f90,-256
621 stf.spill.nta [loc3]=f82,-256
623 stf.spill.nta [loc2]=f74,-256
624 stf.spill.nta [loc3]=f66,-256
626 stf.spill.nta [loc2]=f58,-256
627 stf.spill.nta [loc3]=f50,-256
628 adds loc0=96*16-112,in0
630 stf.spill.nta [loc2]=f42,-256
631 stf.spill.nta [loc3]=f34,-256
632 adds loc1=96*16-112-128,in0
634 stf.spill.nta [loc0]=f121,-256
635 stf.spill.nta [loc1]=f113,-256
637 stf.spill.nta [loc0]=f105,-256
638 stf.spill.nta [loc1]=f97,-256
640 stf.spill.nta [loc0]=f89,-256
641 stf.spill.nta [loc1]=f81,-256
643 stf.spill.nta [loc0]=f73,-256
644 stf.spill.nta [loc1]=f65,-256
646 stf.spill.nta [loc0]=f57,-256
647 stf.spill.nta [loc1]=f49,-256
648 adds loc2=96*16-128,in0
650 stf.spill.nta [loc0]=f41,-256
651 stf.spill.nta [loc1]=f33,-256
652 adds loc3=96*16-128-128,in0
654 stf.spill.nta [loc2]=f120,-256
655 stf.spill.nta [loc3]=f112,-256
657 stf.spill.nta [loc2]=f104,-256
658 stf.spill.nta [loc3]=f96,-256
660 stf.spill.nta [loc2]=f88,-256
661 stf.spill.nta [loc3]=f80,-256
663 stf.spill.nta [loc2]=f72,-256
664 stf.spill.nta [loc3]=f64,-256
666 stf.spill.nta [loc2]=f56,-256
667 stf.spill.nta [loc3]=f48,-256
669 stf.spill.nta [loc2]=f40
670 stf.spill.nta [loc3]=f32
674 GLOBAL_ENTRY(__ia64_load_fpu)
675 alloc r2=ar.pfs,1,2,0,0
682 ldf.fill.nta f32=[in0],loc0
683 ldf.fill.nta f40=[ r3],loc0
684 ldf.fill.nta f48=[r14],loc0
685 ldf.fill.nta f56=[r15],loc0
687 ldf.fill.nta f64=[in0],loc0
688 ldf.fill.nta f72=[ r3],loc0
689 ldf.fill.nta f80=[r14],loc0
690 ldf.fill.nta f88=[r15],loc0
692 ldf.fill.nta f96=[in0],loc1
693 ldf.fill.nta f104=[ r3],loc1
694 ldf.fill.nta f112=[r14],loc1
695 ldf.fill.nta f120=[r15],loc1
697 ldf.fill.nta f33=[in0],loc0
698 ldf.fill.nta f41=[ r3],loc0
699 ldf.fill.nta f49=[r14],loc0
700 ldf.fill.nta f57=[r15],loc0
702 ldf.fill.nta f65=[in0],loc0
703 ldf.fill.nta f73=[ r3],loc0
704 ldf.fill.nta f81=[r14],loc0
705 ldf.fill.nta f89=[r15],loc0
707 ldf.fill.nta f97=[in0],loc1
708 ldf.fill.nta f105=[ r3],loc1
709 ldf.fill.nta f113=[r14],loc1
710 ldf.fill.nta f121=[r15],loc1
712 ldf.fill.nta f34=[in0],loc0
713 ldf.fill.nta f42=[ r3],loc0
714 ldf.fill.nta f50=[r14],loc0
715 ldf.fill.nta f58=[r15],loc0
717 ldf.fill.nta f66=[in0],loc0
718 ldf.fill.nta f74=[ r3],loc0
719 ldf.fill.nta f82=[r14],loc0
720 ldf.fill.nta f90=[r15],loc0
722 ldf.fill.nta f98=[in0],loc1
723 ldf.fill.nta f106=[ r3],loc1
724 ldf.fill.nta f114=[r14],loc1
725 ldf.fill.nta f122=[r15],loc1
727 ldf.fill.nta f35=[in0],loc0
728 ldf.fill.nta f43=[ r3],loc0
729 ldf.fill.nta f51=[r14],loc0
730 ldf.fill.nta f59=[r15],loc0
732 ldf.fill.nta f67=[in0],loc0
733 ldf.fill.nta f75=[ r3],loc0
734 ldf.fill.nta f83=[r14],loc0
735 ldf.fill.nta f91=[r15],loc0
737 ldf.fill.nta f99=[in0],loc1
738 ldf.fill.nta f107=[ r3],loc1
739 ldf.fill.nta f115=[r14],loc1
740 ldf.fill.nta f123=[r15],loc1
742 ldf.fill.nta f36=[in0],loc0
743 ldf.fill.nta f44=[ r3],loc0
744 ldf.fill.nta f52=[r14],loc0
745 ldf.fill.nta f60=[r15],loc0
747 ldf.fill.nta f68=[in0],loc0
748 ldf.fill.nta f76=[ r3],loc0
749 ldf.fill.nta f84=[r14],loc0
750 ldf.fill.nta f92=[r15],loc0
752 ldf.fill.nta f100=[in0],loc1
753 ldf.fill.nta f108=[ r3],loc1
754 ldf.fill.nta f116=[r14],loc1
755 ldf.fill.nta f124=[r15],loc1
757 ldf.fill.nta f37=[in0],loc0
758 ldf.fill.nta f45=[ r3],loc0
759 ldf.fill.nta f53=[r14],loc0
760 ldf.fill.nta f61=[r15],loc0
762 ldf.fill.nta f69=[in0],loc0
763 ldf.fill.nta f77=[ r3],loc0
764 ldf.fill.nta f85=[r14],loc0
765 ldf.fill.nta f93=[r15],loc0
767 ldf.fill.nta f101=[in0],loc1
768 ldf.fill.nta f109=[ r3],loc1
769 ldf.fill.nta f117=[r14],loc1
770 ldf.fill.nta f125=[r15],loc1
772 ldf.fill.nta f38 =[in0],loc0
773 ldf.fill.nta f46 =[ r3],loc0
774 ldf.fill.nta f54 =[r14],loc0
775 ldf.fill.nta f62 =[r15],loc0
777 ldf.fill.nta f70 =[in0],loc0
778 ldf.fill.nta f78 =[ r3],loc0
779 ldf.fill.nta f86 =[r14],loc0
780 ldf.fill.nta f94 =[r15],loc0
782 ldf.fill.nta f102=[in0],loc1
783 ldf.fill.nta f110=[ r3],loc1
784 ldf.fill.nta f118=[r14],loc1
785 ldf.fill.nta f126=[r15],loc1
787 ldf.fill.nta f39 =[in0],loc0
788 ldf.fill.nta f47 =[ r3],loc0
789 ldf.fill.nta f55 =[r14],loc0
790 ldf.fill.nta f63 =[r15],loc0
792 ldf.fill.nta f71 =[in0],loc0
793 ldf.fill.nta f79 =[ r3],loc0
794 ldf.fill.nta f87 =[r14],loc0
795 ldf.fill.nta f95 =[r15],loc0
797 ldf.fill.nta f103=[in0]
798 ldf.fill.nta f111=[ r3]
799 ldf.fill.nta f119=[r14]
800 ldf.fill.nta f127=[r15]
804 GLOBAL_ENTRY(__ia64_init_fpu)
805 stf.spill [sp]=f0 // M3
809 ldfps f33,f34=[sp] // M0
810 ldfps f35,f36=[sp] // M1
818 ldfps f41,f42=[sp] // M0
819 ldfps f43,f44=[sp] // M1
826 ldfps f49,f50=[sp] // M0
827 ldfps f51,f52=[sp] // M1
834 ldfps f57,f58=[sp] // M0
835 ldfps f59,f60=[sp] // M1
842 ldfps f65,f66=[sp] // M0
843 ldfps f67,f68=[sp] // M1
850 ldfps f73,f74=[sp] // M0
851 ldfps f75,f76=[sp] // M1
858 ldfps f81,f82=[sp] // M0
859 ldfps f83,f84=[sp] // M1
867 * When the instructions are cached, it would be faster to initialize
868 * the remaining registers with simply mov instructions (F-unit).
869 * This gets the time down to ~29 cycles. However, this would use up
870 * 33 bundles, whereas continuing with the above pattern yields
871 * 10 bundles and ~30 cycles.
874 ldfps f89,f90=[sp] // M0
875 ldfps f91,f92=[sp] // M1
882 ldfps f97,f98=[sp] // M0
883 ldfps f99,f100=[sp] // M1
890 ldfps f105,f106=[sp] // M0
891 ldfps f107,f108=[sp] // M1
898 ldfps f113,f114=[sp] // M0
899 ldfps f115,f116=[sp] // M1
906 ldfps f121,f122=[sp] // M0
907 ldfps f123,f124=[sp] // M1
912 br.ret.sptk.many rp // F
916 * Switch execution mode from virtual to physical
919 * r16 = new psr to establish
921 * r19 = old virtual address of ar.bsp
922 * r20 = old virtual address of sp
924 * Note: RSE must already be in enforced lazy mode
926 GLOBAL_ENTRY(ia64_switch_mode_phys)
928 rsm psr.i | psr.ic // disable interrupts and interrupt collection
933 flushrs // must be first insn in group
937 mov cr.ipsr=r16 // set new PSR
938 add r3=1f-ia64_switch_mode_phys,r15
942 mov r14=rp // get return address into a general register
945 // going to physical mode, use tpa to translate virt->phys
952 mov r18=ar.rnat // save ar.rnat
953 mov ar.bspstore=r17 // this steps on ar.rnat
957 mov ar.rnat=r18 // restore ar.rnat
958 rfi // must be last insn in group
962 END(ia64_switch_mode_phys)
965 * Switch execution mode from physical to virtual
968 * r16 = new psr to establish
969 * r19 = new bspstore to establish
970 * r20 = new sp to establish
972 * Note: RSE must already be in enforced lazy mode
974 GLOBAL_ENTRY(ia64_switch_mode_virt)
976 rsm psr.i | psr.ic // disable interrupts and interrupt collection
981 flushrs // must be first insn in group
985 mov cr.ipsr=r16 // set new PSR
986 add r3=1f-ia64_switch_mode_virt,r15
988 mov r14=rp // get return address into a general register
992 // - for code addresses, set upper bits of addr to KERNEL_START
993 // - for stack addresses, copy from input argument
994 movl r18=KERNEL_START
995 dep r3=0,r3,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
996 dep r14=0,r14,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
1003 mov r18=ar.rnat // save ar.rnat
1004 mov ar.bspstore=r19 // this steps on ar.rnat
1008 mov ar.rnat=r18 // restore ar.rnat
1009 rfi // must be last insn in group
1013 END(ia64_switch_mode_virt)
1015 GLOBAL_ENTRY(ia64_delay_loop)
1017 { nop 0 // work around GAS unwind info generation bug...
1025 // force loop to be 32-byte aligned (GAS bug means we cannot use .align
1026 // inside function body without corrupting unwind info).
1028 1: br.cloop.sptk.few 1b
1032 END(ia64_delay_loop)
1035 * Return a CPU-local timestamp in nano-seconds. This timestamp is
1036 * NOT synchronized across CPUs its return value must never be
1037 * compared against the values returned on another CPU. The usage in
1038 * kernel/sched.c ensures that.
1040 * The return-value of sched_clock() is NOT supposed to wrap-around.
1041 * If it did, it would cause some scheduling hiccups (at the worst).
1042 * Fortunately, with a 64-bit cycle-counter ticking at 100GHz, even
1043 * that would happen only once every 5+ years.
1045 * The code below basically calculates:
1047 * (ia64_get_itc() * local_cpu_data->nsec_per_cyc) >> IA64_NSEC_PER_CYC_SHIFT
1049 * except that the multiplication and the shift are done with 128-bit
1050 * intermediate precision so that we can produce a full 64-bit result.
1052 GLOBAL_ENTRY(sched_clock)
1053 addl r8=THIS_CPU(cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1054 mov.m r9=ar.itc // fetch cycle-counter (35 cyc)
1058 setf.sig f9=r9 // certain to stall, so issue it _after_ ldf8...
1060 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1061 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1063 getf.sig r8=f10 // (5 cyc)
1066 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1070 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1071 GLOBAL_ENTRY(cycle_to_cputime)
1072 alloc r16=ar.pfs,1,0,0,0
1073 addl r8=THIS_CPU(cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1079 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1080 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1082 getf.sig r8=f10 // (5 cyc)
1085 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1087 END(cycle_to_cputime)
1088 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
1090 GLOBAL_ENTRY(start_kernel_thread)
1092 .save rp, r0 // this is the end of the call-chain
1094 alloc r2 = ar.pfs, 0, 0, 2, 0
1097 br.call.sptk.many rp = kernel_thread_helper;;
1099 br.call.sptk.many rp = sys_exit;;
1100 1: br.sptk.few 1b // not reached
1101 END(start_kernel_thread)
1103 #ifdef CONFIG_IA64_BRL_EMU
1106 * Assembly routines used by brl_emu.c to set preserved register state.
1109 #define SET_REG(reg) \
1110 GLOBAL_ENTRY(ia64_set_##reg); \
1111 alloc r16=ar.pfs,1,0,0,0; \
1114 br.ret.sptk.many rp; \
1123 #endif /* CONFIG_IA64_BRL_EMU */
1127 * This routine handles spinlock contention. It uses a non-standard calling
1128 * convention to avoid converting leaf routines into interior routines. Because
1129 * of this special convention, there are several restrictions:
1131 * - do not use gp relative variables, this code is called from the kernel
1132 * and from modules, r1 is undefined.
1133 * - do not use stacked registers, the caller owns them.
1134 * - do not use the scratch stack space, the caller owns it.
1135 * - do not use any registers other than the ones listed below
1138 * ar.pfs - saved CFM of caller
1139 * ar.ccv - 0 (and available for use)
1140 * r27 - flags from spin_lock_irqsave or 0. Must be preserved.
1141 * r28 - available for use.
1142 * r29 - available for use.
1143 * r30 - available for use.
1144 * r31 - address of lock, available for use.
1145 * b6 - return address
1146 * p14 - available for use.
1147 * p15 - used to track flag status.
1149 * If you patch this code to use more registers, do not forget to update
1150 * the clobber lists for spin_lock() in arch/ia64/include/asm/spinlock.h.
1153 #if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
1155 GLOBAL_ENTRY(ia64_spinlock_contention_pre3_4)
1157 .save ar.pfs, r0 // this code effectively has a zero frame size
1161 tbit.nz p15,p0=r27,IA64_PSR_I_BIT
1162 .restore sp // pop existing prologue after next insn
1169 (p15) ssm psr.i // reenable interrupts if they were on
1170 // DavidM says that srlz.d is slow and is not required in this case
1172 // exponential backoff, kdb, lockmeter etc. go in here
1174 ld4 r30=[r31] // don't use ld4.bias; if it's contended, we won't write the word
1177 cmp4.ne p14,p0=r30,r0
1178 (p14) br.cond.sptk.few .wait
1179 (p15) rsm psr.i // disable interrupts if we reenabled them
1180 br.cond.sptk.few b6 // lock is now free, try to acquire
1181 .global ia64_spinlock_contention_pre3_4_end // for kernprof
1182 ia64_spinlock_contention_pre3_4_end:
1183 END(ia64_spinlock_contention_pre3_4)
1187 GLOBAL_ENTRY(ia64_spinlock_contention)
1191 tbit.nz p15,p0=r27,IA64_PSR_I_BIT
1194 (p15) ssm psr.i // reenable interrupts if they were on
1195 // DavidM says that srlz.d is slow and is not required in this case
1197 // exponential backoff, kdb, lockmeter etc. go in here
1199 ld4 r30=[r31] // don't use ld4.bias; if it's contended, we won't write the word
1201 cmp4.ne p14,p0=r30,r0
1203 (p14) br.cond.sptk.few .wait2
1204 (p15) rsm psr.i // disable interrupts if we reenabled them
1206 cmpxchg4.acq r30=[r31], r30, ar.ccv
1208 cmp4.ne p14,p0=r0,r30
1209 (p14) br.cond.sptk.few .wait
1211 br.ret.sptk.many b6 // lock is now taken
1212 END(ia64_spinlock_contention)
1216 #ifdef CONFIG_HOTPLUG_CPU
1217 GLOBAL_ENTRY(ia64_jump_to_sal)
1218 alloc r16=ar.pfs,1,0,0,0;;
1225 movl r18=tlb_purge_done;;
1226 DATA_VA_TO_PA(r18);;
1227 mov b1=r18 // Return location
1228 movl r18=ia64_do_tlb_purge;;
1229 DATA_VA_TO_PA(r18);;
1230 mov b2=r18 // doing tlb_flush work
1231 mov ar.rsc=0 // Put RSE in enforced lazy, LE mode
1233 DATA_VA_TO_PA(r17);;
1235 movl r16=SAL_PSR_BITS_TO_SET;;
1241 * Invalidate all TLB data/inst
1243 br.sptk.many b2;; // jump to tlb purge code
1246 RESTORE_REGION_REGS(r25, r17,r18,r19);;
1247 RESTORE_REG(b0, r25, r17);;
1248 RESTORE_REG(b1, r25, r17);;
1249 RESTORE_REG(b2, r25, r17);;
1250 RESTORE_REG(b3, r25, r17);;
1251 RESTORE_REG(b4, r25, r17);;
1252 RESTORE_REG(b5, r25, r17);;
1254 ld8 r12=[r25],0x08;;
1255 ld8 r13=[r25],0x08;;
1256 RESTORE_REG(ar.fpsr, r25, r17);;
1257 RESTORE_REG(ar.pfs, r25, r17);;
1258 RESTORE_REG(ar.rnat, r25, r17);;
1259 RESTORE_REG(ar.unat, r25, r17);;
1260 RESTORE_REG(ar.bspstore, r25, r17);;
1261 RESTORE_REG(cr.dcr, r25, r17);;
1262 RESTORE_REG(cr.iva, r25, r17);;
1263 RESTORE_REG(cr.pta, r25, r17);;
1264 srlz.d;; // required not to violate RAW dependency
1265 RESTORE_REG(cr.itv, r25, r17);;
1266 RESTORE_REG(cr.pmv, r25, r17);;
1267 RESTORE_REG(cr.cmcv, r25, r17);;
1268 RESTORE_REG(cr.lrr0, r25, r17);;
1269 RESTORE_REG(cr.lrr1, r25, r17);;
1274 ld8 r17=[r25],0x08;;
1276 RESTORE_REG(ar.lc, r25, r17);;
1278 * Now Restore floating point regs
1280 ldf.fill.nta f2=[r25],16;;
1281 ldf.fill.nta f3=[r25],16;;
1282 ldf.fill.nta f4=[r25],16;;
1283 ldf.fill.nta f5=[r25],16;;
1284 ldf.fill.nta f16=[r25],16;;
1285 ldf.fill.nta f17=[r25],16;;
1286 ldf.fill.nta f18=[r25],16;;
1287 ldf.fill.nta f19=[r25],16;;
1288 ldf.fill.nta f20=[r25],16;;
1289 ldf.fill.nta f21=[r25],16;;
1290 ldf.fill.nta f22=[r25],16;;
1291 ldf.fill.nta f23=[r25],16;;
1292 ldf.fill.nta f24=[r25],16;;
1293 ldf.fill.nta f25=[r25],16;;
1294 ldf.fill.nta f26=[r25],16;;
1295 ldf.fill.nta f27=[r25],16;;
1296 ldf.fill.nta f28=[r25],16;;
1297 ldf.fill.nta f29=[r25],16;;
1298 ldf.fill.nta f30=[r25],16;;
1299 ldf.fill.nta f31=[r25],16;;
1302 * Now that we have done all the register restores
1303 * we are now ready for the big DIVE to SAL Land
1307 br.ret.sptk.many b0;;
1308 END(ia64_jump_to_sal)
1309 #endif /* CONFIG_HOTPLUG_CPU */
1311 #endif /* CONFIG_SMP */