| blob | 30f1ef760136dc39c20821e7c0796b52e43f52da |
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Here is where the ball gets rolling as far as the kernel is concerned.
4 * When control is transferred to _start, the bootload has already
5 * loaded us to the correct address. All that's left to do here is
6 * to set up the kernel's global pointer and jump to the kernel
7 * entry point.
8 *
9 * Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
10 * David Mosberger-Tang <davidm@hpl.hp.com>
11 * Stephane Eranian <eranian@hpl.hp.com>
12 * Copyright (C) 1999 VA Linux Systems
13 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
14 * Copyright (C) 1999 Intel Corp.
15 * Copyright (C) 1999 Asit Mallick <Asit.K.Mallick@intel.com>
16 * Copyright (C) 1999 Don Dugger <Don.Dugger@intel.com>
17 * Copyright (C) 2002 Fenghua Yu <fenghua.yu@intel.com>
18 * -Optimize __ia64_save_fpu() and __ia64_load_fpu() for Itanium 2.
19 * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
20 * Support for CPU Hotplug
21 */
24 #include <linux/pgtable.h>
25 #include <asm/asmmacro.h>
26 #include <asm/fpu.h>
27 #include <asm/kregs.h>
28 #include <asm/mmu_context.h>
29 #include <asm/asm-offsets.h>
30 #include <asm/pal.h>
31 #include <asm/processor.h>
32 #include <asm/ptrace.h>
33 #include <asm/mca_asm.h>
34 #include <linux/init.h>
35 #include <linux/linkage.h>
36 #include <linux/pgtable.h>
37 #include <asm/export.h>
39 #ifdef CONFIG_HOTPLUG_CPU
40 #define SAL_PSR_BITS_TO_SET \
41 (IA64_PSR_AC | IA64_PSR_BN | IA64_PSR_MFH | IA64_PSR_MFL)
43 #define SAVE_FROM_REG(src, ptr, dest) \
44 mov dest=src;; \
45 st8 [ptr]=dest,0x08
47 #define RESTORE_REG(reg, ptr, _tmp) \
48 ld8 _tmp=[ptr],0x08;; \
49 mov reg=_tmp
51 #define SAVE_BREAK_REGS(ptr, _idx, _breg, _dest)\
52 mov ar.lc=IA64_NUM_DBG_REGS-1;; \
53 mov _idx=0;; \
54 1: \
55 SAVE_FROM_REG(_breg[_idx], ptr, _dest);; \
56 add _idx=1,_idx;; \
57 br.cloop.sptk.many 1b
59 #define RESTORE_BREAK_REGS(ptr, _idx, _breg, _tmp, _lbl)\
60 mov ar.lc=IA64_NUM_DBG_REGS-1;; \
61 mov _idx=0;; \
62 _lbl: RESTORE_REG(_breg[_idx], ptr, _tmp);; \
63 add _idx=1, _idx;; \
64 br.cloop.sptk.many _lbl
66 #define SAVE_ONE_RR(num, _reg, _tmp) \
67 movl _tmp=(num<<61);; \
68 mov _reg=rr[_tmp]
70 #define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
71 SAVE_ONE_RR(0,_r0, _tmp);; \
72 SAVE_ONE_RR(1,_r1, _tmp);; \
73 SAVE_ONE_RR(2,_r2, _tmp);; \
74 SAVE_ONE_RR(3,_r3, _tmp);; \
75 SAVE_ONE_RR(4,_r4, _tmp);; \
76 SAVE_ONE_RR(5,_r5, _tmp);; \
77 SAVE_ONE_RR(6,_r6, _tmp);; \
78 SAVE_ONE_RR(7,_r7, _tmp);;
80 #define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
81 st8 [ptr]=_r0, 8;; \
82 st8 [ptr]=_r1, 8;; \
83 st8 [ptr]=_r2, 8;; \
84 st8 [ptr]=_r3, 8;; \
85 st8 [ptr]=_r4, 8;; \
86 st8 [ptr]=_r5, 8;; \
87 st8 [ptr]=_r6, 8;; \
88 st8 [ptr]=_r7, 8;;
90 #define RESTORE_REGION_REGS(ptr, _idx1, _idx2, _tmp) \
91 mov ar.lc=0x08-1;; \
92 movl _idx1=0x00;; \
93 RestRR: \
94 dep.z _idx2=_idx1,61,3;; \
95 ld8 _tmp=[ptr],8;; \
96 mov rr[_idx2]=_tmp;; \
97 srlz.d;; \
98 add _idx1=1,_idx1;; \
99 br.cloop.sptk.few RestRR
101 #define SET_AREA_FOR_BOOTING_CPU(reg1, reg2) \
102 movl reg1=sal_state_for_booting_cpu;; \
103 ld8 reg2=[reg1];;
105 /*
106 * Adjust region registers saved before starting to save
107 * break regs and rest of the states that need to be preserved.
108 */
109 #define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(_reg1,_reg2,_pred) \
110 SAVE_FROM_REG(b0,_reg1,_reg2);; \
111 SAVE_FROM_REG(b1,_reg1,_reg2);; \
112 SAVE_FROM_REG(b2,_reg1,_reg2);; \
113 SAVE_FROM_REG(b3,_reg1,_reg2);; \
114 SAVE_FROM_REG(b4,_reg1,_reg2);; \
115 SAVE_FROM_REG(b5,_reg1,_reg2);; \
116 st8 [_reg1]=r1,0x08;; \
117 st8 [_reg1]=r12,0x08;; \
118 st8 [_reg1]=r13,0x08;; \
119 SAVE_FROM_REG(ar.fpsr,_reg1,_reg2);; \
120 SAVE_FROM_REG(ar.pfs,_reg1,_reg2);; \
121 SAVE_FROM_REG(ar.rnat,_reg1,_reg2);; \
122 SAVE_FROM_REG(ar.unat,_reg1,_reg2);; \
123 SAVE_FROM_REG(ar.bspstore,_reg1,_reg2);; \
124 SAVE_FROM_REG(cr.dcr,_reg1,_reg2);; \
125 SAVE_FROM_REG(cr.iva,_reg1,_reg2);; \
126 SAVE_FROM_REG(cr.pta,_reg1,_reg2);; \
127 SAVE_FROM_REG(cr.itv,_reg1,_reg2);; \
128 SAVE_FROM_REG(cr.pmv,_reg1,_reg2);; \
129 SAVE_FROM_REG(cr.cmcv,_reg1,_reg2);; \
130 SAVE_FROM_REG(cr.lrr0,_reg1,_reg2);; \
131 SAVE_FROM_REG(cr.lrr1,_reg1,_reg2);; \
132 st8 [_reg1]=r4,0x08;; \
133 st8 [_reg1]=r5,0x08;; \
134 st8 [_reg1]=r6,0x08;; \
135 st8 [_reg1]=r7,0x08;; \
136 st8 [_reg1]=_pred,0x08;; \
137 SAVE_FROM_REG(ar.lc, _reg1, _reg2);; \
138 stf.spill.nta [_reg1]=f2,16;; \
139 stf.spill.nta [_reg1]=f3,16;; \
140 stf.spill.nta [_reg1]=f4,16;; \
141 stf.spill.nta [_reg1]=f5,16;; \
142 stf.spill.nta [_reg1]=f16,16;; \
143 stf.spill.nta [_reg1]=f17,16;; \
144 stf.spill.nta [_reg1]=f18,16;; \
145 stf.spill.nta [_reg1]=f19,16;; \
146 stf.spill.nta [_reg1]=f20,16;; \
147 stf.spill.nta [_reg1]=f21,16;; \
148 stf.spill.nta [_reg1]=f22,16;; \
149 stf.spill.nta [_reg1]=f23,16;; \
150 stf.spill.nta [_reg1]=f24,16;; \
151 stf.spill.nta [_reg1]=f25,16;; \
152 stf.spill.nta [_reg1]=f26,16;; \
153 stf.spill.nta [_reg1]=f27,16;; \
154 stf.spill.nta [_reg1]=f28,16;; \
155 stf.spill.nta [_reg1]=f29,16;; \
156 stf.spill.nta [_reg1]=f30,16;; \
157 stf.spill.nta [_reg1]=f31,16;;
159 #else
160 #define SET_AREA_FOR_BOOTING_CPU(a1, a2)
161 #define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(a1,a2, a3)
162 #define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
163 #define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
164 #endif
166 #define SET_ONE_RR(num, pgsize, _tmp1, _tmp2, vhpt) \
167 movl _tmp1=(num << 61);; \
168 mov _tmp2=((ia64_rid(IA64_REGION_ID_KERNEL, (num<<61)) << 8) | (pgsize << 2) | vhpt);; \
169 mov rr[_tmp1]=_tmp2
171 __PAGE_ALIGNED_DATA
173 .global empty_zero_page
174 EXPORT_DATA_SYMBOL_GPL(empty_zero_page)
175 empty_zero_page:
176 .skip PAGE_SIZE
178 .global swapper_pg_dir
179 swapper_pg_dir:
180 .skip PAGE_SIZE
182 .rodata
183 halt_msg:
184 stringz "Halting kernel\n"
186 __REF
188 .global start_ap
190 /*
191 * Start the kernel. When the bootloader passes control to _start(), r28
192 * points to the address of the boot parameter area. Execution reaches
193 * here in physical mode.
194 */
195 GLOBAL_ENTRY(_start)
196 start_ap:
197 .prologue
198 .save rp, r0 // terminate unwind chain with a NULL rp
199 .body
201 rsm psr.i | psr.ic
202 ;;
203 srlz.i
204 ;;
205 {
206 flushrs // must be first insn in group
207 srlz.i
208 }
209 ;;
210 /*
211 * Save the region registers, predicate before they get clobbered
212 */
213 SAVE_REGION_REGS(r2, r8,r9,r10,r11,r12,r13,r14,r15);
214 mov r25=pr;;
216 /*
217 * Initialize kernel region registers:
218 * rr[0]: VHPT enabled, page size = PAGE_SHIFT
219 * rr[1]: VHPT enabled, page size = PAGE_SHIFT
220 * rr[2]: VHPT enabled, page size = PAGE_SHIFT
221 * rr[3]: VHPT enabled, page size = PAGE_SHIFT
222 * rr[4]: VHPT enabled, page size = PAGE_SHIFT
223 * rr[5]: VHPT enabled, page size = PAGE_SHIFT
224 * rr[6]: VHPT disabled, page size = IA64_GRANULE_SHIFT
225 * rr[7]: VHPT disabled, page size = IA64_GRANULE_SHIFT
226 * We initialize all of them to prevent inadvertently assuming
227 * something about the state of address translation early in boot.
228 */
229 SET_ONE_RR(0, PAGE_SHIFT, r2, r16, 1);;
230 SET_ONE_RR(1, PAGE_SHIFT, r2, r16, 1);;
231 SET_ONE_RR(2, PAGE_SHIFT, r2, r16, 1);;
232 SET_ONE_RR(3, PAGE_SHIFT, r2, r16, 1);;
233 SET_ONE_RR(4, PAGE_SHIFT, r2, r16, 1);;
234 SET_ONE_RR(5, PAGE_SHIFT, r2, r16, 1);;
235 SET_ONE_RR(6, IA64_GRANULE_SHIFT, r2, r16, 0);;
236 SET_ONE_RR(7, IA64_GRANULE_SHIFT, r2, r16, 0);;
237 /*
238 * Now pin mappings into the TLB for kernel text and data
239 */
240 mov r18=KERNEL_TR_PAGE_SHIFT<<2
241 movl r17=KERNEL_START
242 ;;
243 mov cr.itir=r18
244 mov cr.ifa=r17
245 mov r16=IA64_TR_KERNEL
246 mov r3=ip
247 movl r18=PAGE_KERNEL
248 ;;
249 dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT
250 ;;
251 or r18=r2,r18
252 ;;
253 srlz.i
254 ;;
255 itr.i itr[r16]=r18
256 ;;
257 itr.d dtr[r16]=r18
258 ;;
259 srlz.i
261 /*
262 * Switch into virtual mode:
263 */
264 movl r16=(IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN \
265 |IA64_PSR_DI)
266 ;;
267 mov cr.ipsr=r16
268 movl r17=1f
269 ;;
270 mov cr.iip=r17
271 mov cr.ifs=r0
272 ;;
273 rfi
274 ;;
275 1: // now we are in virtual mode
277 SET_AREA_FOR_BOOTING_CPU(r2, r16);
279 STORE_REGION_REGS(r16, r8,r9,r10,r11,r12,r13,r14,r15);
280 SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(r16,r17,r25)
281 ;;
283 // set IVT entry point---can't access I/O ports without it
284 movl r3=ia64_ivt
285 ;;
286 mov cr.iva=r3
287 movl r2=FPSR_DEFAULT
288 ;;
289 srlz.i
290 movl gp=__gp
292 mov ar.fpsr=r2
293 ;;
295 #define isAP p2 // are we an Application Processor?
296 #define isBP p3 // are we the Bootstrap Processor?
298 #ifdef CONFIG_SMP
299 /*
300 * Find the init_task for the currently booting CPU. At poweron, and in
301 * UP mode, task_for_booting_cpu is NULL.
302 */
303 movl r3=task_for_booting_cpu
304 ;;
305 ld8 r3=[r3]
306 movl r2=init_task
307 ;;
308 cmp.eq isBP,isAP=r3,r0
309 ;;
310 (isAP) mov r2=r3
311 #else
312 movl r2=init_task
313 cmp.eq isBP,isAP=r0,r0
314 #endif
315 ;;
316 tpa r3=r2 // r3 == phys addr of task struct
317 mov r16=-1
318 (isBP) br.cond.dpnt .load_current // BP stack is on region 5 --- no need to map it
320 // load mapping for stack (virtaddr in r2, physaddr in r3)
321 rsm psr.ic
322 movl r17=PAGE_KERNEL
323 ;;
324 srlz.d
325 dep r18=0,r3,0,12
326 ;;
327 or r18=r17,r18
328 dep r2=-1,r3,61,3 // IMVA of task
329 ;;
330 mov r17=rr[r2]
331 shr.u r16=r3,IA64_GRANULE_SHIFT
332 ;;
333 dep r17=0,r17,8,24
334 ;;
335 mov cr.itir=r17
336 mov cr.ifa=r2
338 mov r19=IA64_TR_CURRENT_STACK
339 ;;
340 itr.d dtr[r19]=r18
341 ;;
342 ssm psr.ic
343 srlz.d
344 ;;
346 .load_current:
347 // load the "current" pointer (r13) and ar.k6 with the current task
348 mov IA64_KR(CURRENT)=r2 // virtual address
349 mov IA64_KR(CURRENT_STACK)=r16
350 mov r13=r2
351 /*
352 * Reserve space at the top of the stack for "struct pt_regs". Kernel
353 * threads don't store interesting values in that structure, but the space
354 * still needs to be there because time-critical stuff such as the context
355 * switching can be implemented more efficiently (for example, __switch_to()
356 * always sets the psr.dfh bit of the task it is switching to).
357 */
359 addl r12=IA64_STK_OFFSET-IA64_PT_REGS_SIZE-16,r2
360 addl r2=IA64_RBS_OFFSET,r2 // initialize the RSE
361 mov ar.rsc=0 // place RSE in enforced lazy mode
362 ;;
363 loadrs // clear the dirty partition
364 movl r19=__phys_per_cpu_start
365 mov r18=PERCPU_PAGE_SIZE
366 ;;
367 #ifndef CONFIG_SMP
368 add r19=r19,r18
369 ;;
370 #else
371 (isAP) br.few 2f
372 movl r20=__cpu0_per_cpu
373 ;;
374 shr.u r18=r18,3
375 1:
376 ld8 r21=[r19],8;;
377 st8[r20]=r21,8
378 adds r18=-1,r18;;
379 cmp4.lt p7,p6=0,r18
380 (p7) br.cond.dptk.few 1b
381 mov r19=r20
382 ;;
383 2:
384 #endif
385 tpa r19=r19
386 ;;
387 .pred.rel.mutex isBP,isAP
388 (isBP) mov IA64_KR(PER_CPU_DATA)=r19 // per-CPU base for cpu0
389 (isAP) mov IA64_KR(PER_CPU_DATA)=r0 // clear physical per-CPU base
390 ;;
391 mov ar.bspstore=r2 // establish the new RSE stack
392 ;;
393 mov ar.rsc=0x3 // place RSE in eager mode
395 (isBP) dep r28=-1,r28,61,3 // make address virtual
396 (isBP) movl r2=ia64_boot_param
397 ;;
398 (isBP) st8 [r2]=r28 // save the address of the boot param area passed by the bootloader
400 #ifdef CONFIG_SMP
401 (isAP) br.call.sptk.many rp=start_secondary
402 .ret0:
403 (isAP) br.cond.sptk self
404 #endif
406 // This is executed by the bootstrap processor (bsp) only:
408 #ifdef CONFIG_IA64_FW_EMU
409 // initialize PAL & SAL emulator:
410 br.call.sptk.many rp=sys_fw_init
411 .ret1:
412 #endif
413 br.call.sptk.many rp=start_kernel
414 .ret2: addl r3=@ltoff(halt_msg),gp
415 ;;
416 alloc r2=ar.pfs,8,0,2,0
417 ;;
418 ld8 out0=[r3]
419 br.call.sptk.many b0=console_print
421 self: hint @pause
422 br.sptk.many self // endless loop
423 END(_start)
425 .text
427 GLOBAL_ENTRY(ia64_save_debug_regs)
428 alloc r16=ar.pfs,1,0,0,0
429 mov r20=ar.lc // preserve ar.lc
430 mov ar.lc=IA64_NUM_DBG_REGS-1
431 mov r18=0
432 add r19=IA64_NUM_DBG_REGS*8,in0
433 ;;
434 1: mov r16=dbr[r18]
435 #ifdef CONFIG_ITANIUM
436 ;;
437 srlz.d
438 #endif
439 mov r17=ibr[r18]
440 add r18=1,r18
441 ;;
442 st8.nta [in0]=r16,8
443 st8.nta [r19]=r17,8
444 br.cloop.sptk.many 1b
445 ;;
446 mov ar.lc=r20 // restore ar.lc
447 br.ret.sptk.many rp
448 END(ia64_save_debug_regs)
450 GLOBAL_ENTRY(ia64_load_debug_regs)
451 alloc r16=ar.pfs,1,0,0,0
452 lfetch.nta [in0]
453 mov r20=ar.lc // preserve ar.lc
454 add r19=IA64_NUM_DBG_REGS*8,in0
455 mov ar.lc=IA64_NUM_DBG_REGS-1
456 mov r18=-1
457 ;;
458 1: ld8.nta r16=[in0],8
459 ld8.nta r17=[r19],8
460 add r18=1,r18
461 ;;
462 mov dbr[r18]=r16
463 #ifdef CONFIG_ITANIUM
464 ;;
465 srlz.d // Errata 132 (NoFix status)
466 #endif
467 mov ibr[r18]=r17
468 br.cloop.sptk.many 1b
469 ;;
470 mov ar.lc=r20 // restore ar.lc
471 br.ret.sptk.many rp
472 END(ia64_load_debug_regs)
474 GLOBAL_ENTRY(__ia64_save_fpu)
475 alloc r2=ar.pfs,1,4,0,0
476 adds loc0=96*16-16,in0
477 adds loc1=96*16-16-128,in0
478 ;;
479 stf.spill.nta [loc0]=f127,-256
480 stf.spill.nta [loc1]=f119,-256
481 ;;
482 stf.spill.nta [loc0]=f111,-256
483 stf.spill.nta [loc1]=f103,-256
484 ;;
485 stf.spill.nta [loc0]=f95,-256
486 stf.spill.nta [loc1]=f87,-256
487 ;;
488 stf.spill.nta [loc0]=f79,-256
489 stf.spill.nta [loc1]=f71,-256
490 ;;
491 stf.spill.nta [loc0]=f63,-256
492 stf.spill.nta [loc1]=f55,-256
493 adds loc2=96*16-32,in0
494 ;;
495 stf.spill.nta [loc0]=f47,-256
496 stf.spill.nta [loc1]=f39,-256
497 adds loc3=96*16-32-128,in0
498 ;;
499 stf.spill.nta [loc2]=f126,-256
500 stf.spill.nta [loc3]=f118,-256
501 ;;
502 stf.spill.nta [loc2]=f110,-256
503 stf.spill.nta [loc3]=f102,-256
504 ;;
505 stf.spill.nta [loc2]=f94,-256
506 stf.spill.nta [loc3]=f86,-256
507 ;;
508 stf.spill.nta [loc2]=f78,-256
509 stf.spill.nta [loc3]=f70,-256
510 ;;
511 stf.spill.nta [loc2]=f62,-256
512 stf.spill.nta [loc3]=f54,-256
513 adds loc0=96*16-48,in0
514 ;;
515 stf.spill.nta [loc2]=f46,-256
516 stf.spill.nta [loc3]=f38,-256
517 adds loc1=96*16-48-128,in0
518 ;;
519 stf.spill.nta [loc0]=f125,-256
520 stf.spill.nta [loc1]=f117,-256
521 ;;
522 stf.spill.nta [loc0]=f109,-256
523 stf.spill.nta [loc1]=f101,-256
524 ;;
525 stf.spill.nta [loc0]=f93,-256
526 stf.spill.nta [loc1]=f85,-256
527 ;;
528 stf.spill.nta [loc0]=f77,-256
529 stf.spill.nta [loc1]=f69,-256
530 ;;
531 stf.spill.nta [loc0]=f61,-256
532 stf.spill.nta [loc1]=f53,-256
533 adds loc2=96*16-64,in0
534 ;;
535 stf.spill.nta [loc0]=f45,-256
536 stf.spill.nta [loc1]=f37,-256
537 adds loc3=96*16-64-128,in0
538 ;;
539 stf.spill.nta [loc2]=f124,-256
540 stf.spill.nta [loc3]=f116,-256
541 ;;
542 stf.spill.nta [loc2]=f108,-256
543 stf.spill.nta [loc3]=f100,-256
544 ;;
545 stf.spill.nta [loc2]=f92,-256
546 stf.spill.nta [loc3]=f84,-256
547 ;;
548 stf.spill.nta [loc2]=f76,-256
549 stf.spill.nta [loc3]=f68,-256
550 ;;
551 stf.spill.nta [loc2]=f60,-256
552 stf.spill.nta [loc3]=f52,-256
553 adds loc0=96*16-80,in0
554 ;;
555 stf.spill.nta [loc2]=f44,-256
556 stf.spill.nta [loc3]=f36,-256
557 adds loc1=96*16-80-128,in0
558 ;;
559 stf.spill.nta [loc0]=f123,-256
560 stf.spill.nta [loc1]=f115,-256
561 ;;
562 stf.spill.nta [loc0]=f107,-256
563 stf.spill.nta [loc1]=f99,-256
564 ;;
565 stf.spill.nta [loc0]=f91,-256
566 stf.spill.nta [loc1]=f83,-256
567 ;;
568 stf.spill.nta [loc0]=f75,-256
569 stf.spill.nta [loc1]=f67,-256
570 ;;
571 stf.spill.nta [loc0]=f59,-256
572 stf.spill.nta [loc1]=f51,-256
573 adds loc2=96*16-96,in0
574 ;;
575 stf.spill.nta [loc0]=f43,-256
576 stf.spill.nta [loc1]=f35,-256
577 adds loc3=96*16-96-128,in0
578 ;;
579 stf.spill.nta [loc2]=f122,-256
580 stf.spill.nta [loc3]=f114,-256
581 ;;
582 stf.spill.nta [loc2]=f106,-256
583 stf.spill.nta [loc3]=f98,-256
584 ;;
585 stf.spill.nta [loc2]=f90,-256
586 stf.spill.nta [loc3]=f82,-256
587 ;;
588 stf.spill.nta [loc2]=f74,-256
589 stf.spill.nta [loc3]=f66,-256
590 ;;
591 stf.spill.nta [loc2]=f58,-256
592 stf.spill.nta [loc3]=f50,-256
593 adds loc0=96*16-112,in0
594 ;;
595 stf.spill.nta [loc2]=f42,-256
596 stf.spill.nta [loc3]=f34,-256
597 adds loc1=96*16-112-128,in0
598 ;;
599 stf.spill.nta [loc0]=f121,-256
600 stf.spill.nta [loc1]=f113,-256
601 ;;
602 stf.spill.nta [loc0]=f105,-256
603 stf.spill.nta [loc1]=f97,-256
604 ;;
605 stf.spill.nta [loc0]=f89,-256
606 stf.spill.nta [loc1]=f81,-256
607 ;;
608 stf.spill.nta [loc0]=f73,-256
609 stf.spill.nta [loc1]=f65,-256
610 ;;
611 stf.spill.nta [loc0]=f57,-256
612 stf.spill.nta [loc1]=f49,-256
613 adds loc2=96*16-128,in0
614 ;;
615 stf.spill.nta [loc0]=f41,-256
616 stf.spill.nta [loc1]=f33,-256
617 adds loc3=96*16-128-128,in0
618 ;;
619 stf.spill.nta [loc2]=f120,-256
620 stf.spill.nta [loc3]=f112,-256
621 ;;
622 stf.spill.nta [loc2]=f104,-256
623 stf.spill.nta [loc3]=f96,-256
624 ;;
625 stf.spill.nta [loc2]=f88,-256
626 stf.spill.nta [loc3]=f80,-256
627 ;;
628 stf.spill.nta [loc2]=f72,-256
629 stf.spill.nta [loc3]=f64,-256
630 ;;
631 stf.spill.nta [loc2]=f56,-256
632 stf.spill.nta [loc3]=f48,-256
633 ;;
634 stf.spill.nta [loc2]=f40
635 stf.spill.nta [loc3]=f32
636 br.ret.sptk.many rp
637 END(__ia64_save_fpu)
639 GLOBAL_ENTRY(__ia64_load_fpu)
640 alloc r2=ar.pfs,1,2,0,0
641 adds r3=128,in0
642 adds r14=256,in0
643 adds r15=384,in0
644 mov loc0=512
645 mov loc1=-1024+16
646 ;;
647 ldf.fill.nta f32=[in0],loc0
648 ldf.fill.nta f40=[ r3],loc0
649 ldf.fill.nta f48=[r14],loc0
650 ldf.fill.nta f56=[r15],loc0
651 ;;
652 ldf.fill.nta f64=[in0],loc0
653 ldf.fill.nta f72=[ r3],loc0
654 ldf.fill.nta f80=[r14],loc0
655 ldf.fill.nta f88=[r15],loc0
656 ;;
657 ldf.fill.nta f96=[in0],loc1
658 ldf.fill.nta f104=[ r3],loc1
659 ldf.fill.nta f112=[r14],loc1
660 ldf.fill.nta f120=[r15],loc1
661 ;;
662 ldf.fill.nta f33=[in0],loc0
663 ldf.fill.nta f41=[ r3],loc0
664 ldf.fill.nta f49=[r14],loc0
665 ldf.fill.nta f57=[r15],loc0
666 ;;
667 ldf.fill.nta f65=[in0],loc0
668 ldf.fill.nta f73=[ r3],loc0
669 ldf.fill.nta f81=[r14],loc0
670 ldf.fill.nta f89=[r15],loc0
671 ;;
672 ldf.fill.nta f97=[in0],loc1
673 ldf.fill.nta f105=[ r3],loc1
674 ldf.fill.nta f113=[r14],loc1
675 ldf.fill.nta f121=[r15],loc1
676 ;;
677 ldf.fill.nta f34=[in0],loc0
678 ldf.fill.nta f42=[ r3],loc0
679 ldf.fill.nta f50=[r14],loc0
680 ldf.fill.nta f58=[r15],loc0
681 ;;
682 ldf.fill.nta f66=[in0],loc0
683 ldf.fill.nta f74=[ r3],loc0
684 ldf.fill.nta f82=[r14],loc0
685 ldf.fill.nta f90=[r15],loc0
686 ;;
687 ldf.fill.nta f98=[in0],loc1
688 ldf.fill.nta f106=[ r3],loc1
689 ldf.fill.nta f114=[r14],loc1
690 ldf.fill.nta f122=[r15],loc1
691 ;;
692 ldf.fill.nta f35=[in0],loc0
693 ldf.fill.nta f43=[ r3],loc0
694 ldf.fill.nta f51=[r14],loc0
695 ldf.fill.nta f59=[r15],loc0
696 ;;
697 ldf.fill.nta f67=[in0],loc0
698 ldf.fill.nta f75=[ r3],loc0
699 ldf.fill.nta f83=[r14],loc0
700 ldf.fill.nta f91=[r15],loc0
701 ;;
702 ldf.fill.nta f99=[in0],loc1
703 ldf.fill.nta f107=[ r3],loc1
704 ldf.fill.nta f115=[r14],loc1
705 ldf.fill.nta f123=[r15],loc1
706 ;;
707 ldf.fill.nta f36=[in0],loc0
708 ldf.fill.nta f44=[ r3],loc0
709 ldf.fill.nta f52=[r14],loc0
710 ldf.fill.nta f60=[r15],loc0
711 ;;
712 ldf.fill.nta f68=[in0],loc0
713 ldf.fill.nta f76=[ r3],loc0
714 ldf.fill.nta f84=[r14],loc0
715 ldf.fill.nta f92=[r15],loc0
716 ;;
717 ldf.fill.nta f100=[in0],loc1
718 ldf.fill.nta f108=[ r3],loc1
719 ldf.fill.nta f116=[r14],loc1
720 ldf.fill.nta f124=[r15],loc1
721 ;;
722 ldf.fill.nta f37=[in0],loc0
723 ldf.fill.nta f45=[ r3],loc0
724 ldf.fill.nta f53=[r14],loc0
725 ldf.fill.nta f61=[r15],loc0
726 ;;
727 ldf.fill.nta f69=[in0],loc0
728 ldf.fill.nta f77=[ r3],loc0
729 ldf.fill.nta f85=[r14],loc0
730 ldf.fill.nta f93=[r15],loc0
731 ;;
732 ldf.fill.nta f101=[in0],loc1
733 ldf.fill.nta f109=[ r3],loc1
734 ldf.fill.nta f117=[r14],loc1
735 ldf.fill.nta f125=[r15],loc1
736 ;;
737 ldf.fill.nta f38 =[in0],loc0
738 ldf.fill.nta f46 =[ r3],loc0
739 ldf.fill.nta f54 =[r14],loc0
740 ldf.fill.nta f62 =[r15],loc0
741 ;;
742 ldf.fill.nta f70 =[in0],loc0
743 ldf.fill.nta f78 =[ r3],loc0
744 ldf.fill.nta f86 =[r14],loc0
745 ldf.fill.nta f94 =[r15],loc0
746 ;;
747 ldf.fill.nta f102=[in0],loc1
748 ldf.fill.nta f110=[ r3],loc1
749 ldf.fill.nta f118=[r14],loc1
750 ldf.fill.nta f126=[r15],loc1
751 ;;
752 ldf.fill.nta f39 =[in0],loc0
753 ldf.fill.nta f47 =[ r3],loc0
754 ldf.fill.nta f55 =[r14],loc0
755 ldf.fill.nta f63 =[r15],loc0
756 ;;
757 ldf.fill.nta f71 =[in0],loc0
758 ldf.fill.nta f79 =[ r3],loc0
759 ldf.fill.nta f87 =[r14],loc0
760 ldf.fill.nta f95 =[r15],loc0
761 ;;
762 ldf.fill.nta f103=[in0]
763 ldf.fill.nta f111=[ r3]
764 ldf.fill.nta f119=[r14]
765 ldf.fill.nta f127=[r15]
766 br.ret.sptk.many rp
767 END(__ia64_load_fpu)
769 GLOBAL_ENTRY(__ia64_init_fpu)
770 stf.spill [sp]=f0 // M3
771 mov f32=f0 // F
772 nop.b 0
774 ldfps f33,f34=[sp] // M0
775 ldfps f35,f36=[sp] // M1
776 mov f37=f0 // F
777 ;;
779 setf.s f38=r0 // M2
780 setf.s f39=r0 // M3
781 mov f40=f0 // F
783 ldfps f41,f42=[sp] // M0
784 ldfps f43,f44=[sp] // M1
785 mov f45=f0 // F
787 setf.s f46=r0 // M2
788 setf.s f47=r0 // M3
789 mov f48=f0 // F
791 ldfps f49,f50=[sp] // M0
792 ldfps f51,f52=[sp] // M1
793 mov f53=f0 // F
795 setf.s f54=r0 // M2
796 setf.s f55=r0 // M3
797 mov f56=f0 // F
799 ldfps f57,f58=[sp] // M0
800 ldfps f59,f60=[sp] // M1
801 mov f61=f0 // F
803 setf.s f62=r0 // M2
804 setf.s f63=r0 // M3
805 mov f64=f0 // F
807 ldfps f65,f66=[sp] // M0
808 ldfps f67,f68=[sp] // M1
809 mov f69=f0 // F
811 setf.s f70=r0 // M2
812 setf.s f71=r0 // M3
813 mov f72=f0 // F
815 ldfps f73,f74=[sp] // M0
816 ldfps f75,f76=[sp] // M1
817 mov f77=f0 // F
819 setf.s f78=r0 // M2
820 setf.s f79=r0 // M3
821 mov f80=f0 // F
823 ldfps f81,f82=[sp] // M0
824 ldfps f83,f84=[sp] // M1
825 mov f85=f0 // F
827 setf.s f86=r0 // M2
828 setf.s f87=r0 // M3
829 mov f88=f0 // F
831 /*
832 * When the instructions are cached, it would be faster to initialize
833 * the remaining registers with simply mov instructions (F-unit).
834 * This gets the time down to ~29 cycles. However, this would use up
835 * 33 bundles, whereas continuing with the above pattern yields
836 * 10 bundles and ~30 cycles.
837 */
839 ldfps f89,f90=[sp] // M0
840 ldfps f91,f92=[sp] // M1
841 mov f93=f0 // F
843 setf.s f94=r0 // M2
844 setf.s f95=r0 // M3
845 mov f96=f0 // F
847 ldfps f97,f98=[sp] // M0
848 ldfps f99,f100=[sp] // M1
849 mov f101=f0 // F
851 setf.s f102=r0 // M2
852 setf.s f103=r0 // M3
853 mov f104=f0 // F
855 ldfps f105,f106=[sp] // M0
856 ldfps f107,f108=[sp] // M1
857 mov f109=f0 // F
859 setf.s f110=r0 // M2
860 setf.s f111=r0 // M3
861 mov f112=f0 // F
863 ldfps f113,f114=[sp] // M0
864 ldfps f115,f116=[sp] // M1
865 mov f117=f0 // F
867 setf.s f118=r0 // M2
868 setf.s f119=r0 // M3
869 mov f120=f0 // F
871 ldfps f121,f122=[sp] // M0
872 ldfps f123,f124=[sp] // M1
873 mov f125=f0 // F
875 setf.s f126=r0 // M2
876 setf.s f127=r0 // M3
877 br.ret.sptk.many rp // F
878 END(__ia64_init_fpu)
880 /*
881 * Switch execution mode from virtual to physical
882 *
883 * Inputs:
884 * r16 = new psr to establish
885 * Output:
886 * r19 = old virtual address of ar.bsp
887 * r20 = old virtual address of sp
888 *
889 * Note: RSE must already be in enforced lazy mode
890 */
891 GLOBAL_ENTRY(ia64_switch_mode_phys)
892 {
893 rsm psr.i | psr.ic // disable interrupts and interrupt collection
894 mov r15=ip
895 }
896 ;;
897 {
898 flushrs // must be first insn in group
899 srlz.i
900 }
901 ;;
902 mov cr.ipsr=r16 // set new PSR
903 add r3=1f-ia64_switch_mode_phys,r15
905 mov r19=ar.bsp
906 mov r20=sp
907 mov r14=rp // get return address into a general register
908 ;;
910 // going to physical mode, use tpa to translate virt->phys
911 tpa r17=r19
912 tpa r3=r3
913 tpa sp=sp
914 tpa r14=r14
915 ;;
917 mov r18=ar.rnat // save ar.rnat
918 mov ar.bspstore=r17 // this steps on ar.rnat
919 mov cr.iip=r3
920 mov cr.ifs=r0
921 ;;
922 mov ar.rnat=r18 // restore ar.rnat
923 rfi // must be last insn in group
924 ;;
925 1: mov rp=r14
926 br.ret.sptk.many rp
927 END(ia64_switch_mode_phys)
929 /*
930 * Switch execution mode from physical to virtual
931 *
932 * Inputs:
933 * r16 = new psr to establish
934 * r19 = new bspstore to establish
935 * r20 = new sp to establish
936 *
937 * Note: RSE must already be in enforced lazy mode
938 */
939 GLOBAL_ENTRY(ia64_switch_mode_virt)
940 {
941 rsm psr.i | psr.ic // disable interrupts and interrupt collection
942 mov r15=ip
943 }
944 ;;
945 {
946 flushrs // must be first insn in group
947 srlz.i
948 }
949 ;;
950 mov cr.ipsr=r16 // set new PSR
951 add r3=1f-ia64_switch_mode_virt,r15
953 mov r14=rp // get return address into a general register
954 ;;
956 // going to virtual
957 // - for code addresses, set upper bits of addr to KERNEL_START
958 // - for stack addresses, copy from input argument
959 movl r18=KERNEL_START
960 dep r3=0,r3,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
961 dep r14=0,r14,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
962 mov sp=r20
963 ;;
964 or r3=r3,r18
965 or r14=r14,r18
966 ;;
968 mov r18=ar.rnat // save ar.rnat
969 mov ar.bspstore=r19 // this steps on ar.rnat
970 mov cr.iip=r3
971 mov cr.ifs=r0
972 ;;
973 mov ar.rnat=r18 // restore ar.rnat
974 rfi // must be last insn in group
975 ;;
976 1: mov rp=r14
977 br.ret.sptk.many rp
978 END(ia64_switch_mode_virt)
980 GLOBAL_ENTRY(ia64_delay_loop)
981 .prologue
982 { nop 0 // work around GAS unwind info generation bug...
983 .save ar.lc,r2
984 mov r2=ar.lc
985 .body
986 ;;
987 mov ar.lc=r32
988 }
989 ;;
990 // force loop to be 32-byte aligned (GAS bug means we cannot use .align
991 // inside function body without corrupting unwind info).
992 { nop 0 }
993 1: br.cloop.sptk.few 1b
994 ;;
995 mov ar.lc=r2
996 br.ret.sptk.many rp
997 END(ia64_delay_loop)
999 /*
1000 * Return a CPU-local timestamp in nano-seconds. This timestamp is
1001 * NOT synchronized across CPUs its return value must never be
1002 * compared against the values returned on another CPU. The usage in
1003 * kernel/sched/core.c ensures that.
1004 *
1005 * The return-value of sched_clock() is NOT supposed to wrap-around.
1006 * If it did, it would cause some scheduling hiccups (at the worst).
1007 * Fortunately, with a 64-bit cycle-counter ticking at 100GHz, even
1008 * that would happen only once every 5+ years.
1009 *
1010 * The code below basically calculates:
1011 *
1012 * (ia64_get_itc() * local_cpu_data->nsec_per_cyc) >> IA64_NSEC_PER_CYC_SHIFT
1013 *
1014 * except that the multiplication and the shift are done with 128-bit
1015 * intermediate precision so that we can produce a full 64-bit result.
1016 */
1017 GLOBAL_ENTRY(ia64_native_sched_clock)
1018 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1019 mov.m r9=ar.itc // fetch cycle-counter (35 cyc)
1020 ;;
1021 ldf8 f8=[r8]
1022 ;;
1023 setf.sig f9=r9 // certain to stall, so issue it _after_ ldf8...
1024 ;;
1025 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1026 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1027 ;;
1028 getf.sig r8=f10 // (5 cyc)
1029 getf.sig r9=f11
1030 ;;
1031 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1032 br.ret.sptk.many rp
1033 END(ia64_native_sched_clock)
1035 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1036 GLOBAL_ENTRY(cycle_to_nsec)
1037 alloc r16=ar.pfs,1,0,0,0
1038 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1039 ;;
1040 ldf8 f8=[r8]
1041 ;;
1042 setf.sig f9=r32
1043 ;;
1044 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1045 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1046 ;;
1047 getf.sig r8=f10 // (5 cyc)
1048 getf.sig r9=f11
1049 ;;
1050 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1051 br.ret.sptk.many rp
1052 END(cycle_to_nsec)
1053 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
1055 #ifdef CONFIG_IA64_BRL_EMU
1057 /*
1058 * Assembly routines used by brl_emu.c to set preserved register state.
1059 */
1061 #define SET_REG(reg) \
1062 GLOBAL_ENTRY(ia64_set_##reg); \
1063 alloc r16=ar.pfs,1,0,0,0; \
1064 mov reg=r32; \
1065 ;; \
1066 br.ret.sptk.many rp; \
1067 END(ia64_set_##reg)
1069 SET_REG(b1);
1070 SET_REG(b2);
1071 SET_REG(b3);
1072 SET_REG(b4);
1073 SET_REG(b5);
1075 #endif /* CONFIG_IA64_BRL_EMU */
1077 #ifdef CONFIG_SMP
1079 #ifdef CONFIG_HOTPLUG_CPU
1080 GLOBAL_ENTRY(ia64_jump_to_sal)
1081 alloc r16=ar.pfs,1,0,0,0;;
1082 rsm psr.i | psr.ic
1083 {
1084 flushrs
1085 srlz.i
1086 }
1087 tpa r25=in0
1088 movl r18=tlb_purge_done;;
1089 DATA_VA_TO_PA(r18);;
1090 mov b1=r18 // Return location
1091 movl r18=ia64_do_tlb_purge;;
1092 DATA_VA_TO_PA(r18);;
1093 mov b2=r18 // doing tlb_flush work
1094 mov ar.rsc=0 // Put RSE in enforced lazy, LE mode
1095 movl r17=1f;;
1096 DATA_VA_TO_PA(r17);;
1097 mov cr.iip=r17
1098 movl r16=SAL_PSR_BITS_TO_SET;;
1099 mov cr.ipsr=r16
1100 mov cr.ifs=r0;;
1101 rfi;; // note: this unmask MCA/INIT (psr.mc)
1102 1:
1103 /*
1104 * Invalidate all TLB data/inst
1105 */
1106 br.sptk.many b2;; // jump to tlb purge code
1108 tlb_purge_done:
1109 RESTORE_REGION_REGS(r25, r17,r18,r19);;
1110 RESTORE_REG(b0, r25, r17);;
1111 RESTORE_REG(b1, r25, r17);;
1112 RESTORE_REG(b2, r25, r17);;
1113 RESTORE_REG(b3, r25, r17);;
1114 RESTORE_REG(b4, r25, r17);;
1115 RESTORE_REG(b5, r25, r17);;
1116 ld8 r1=[r25],0x08;;
1117 ld8 r12=[r25],0x08;;
1118 ld8 r13=[r25],0x08;;
1119 RESTORE_REG(ar.fpsr, r25, r17);;
1120 RESTORE_REG(ar.pfs, r25, r17);;
1121 RESTORE_REG(ar.rnat, r25, r17);;
1122 RESTORE_REG(ar.unat, r25, r17);;
1123 RESTORE_REG(ar.bspstore, r25, r17);;
1124 RESTORE_REG(cr.dcr, r25, r17);;
1125 RESTORE_REG(cr.iva, r25, r17);;
1126 RESTORE_REG(cr.pta, r25, r17);;
1127 srlz.d;; // required not to violate RAW dependency
1128 RESTORE_REG(cr.itv, r25, r17);;
1129 RESTORE_REG(cr.pmv, r25, r17);;
1130 RESTORE_REG(cr.cmcv, r25, r17);;
1131 RESTORE_REG(cr.lrr0, r25, r17);;
1132 RESTORE_REG(cr.lrr1, r25, r17);;
1133 ld8 r4=[r25],0x08;;
1134 ld8 r5=[r25],0x08;;
1135 ld8 r6=[r25],0x08;;
1136 ld8 r7=[r25],0x08;;
1137 ld8 r17=[r25],0x08;;
1138 mov pr=r17,-1;;
1139 RESTORE_REG(ar.lc, r25, r17);;
1140 /*
1141 * Now Restore floating point regs
1142 */
1143 ldf.fill.nta f2=[r25],16;;
1144 ldf.fill.nta f3=[r25],16;;
1145 ldf.fill.nta f4=[r25],16;;
1146 ldf.fill.nta f5=[r25],16;;
1147 ldf.fill.nta f16=[r25],16;;
1148 ldf.fill.nta f17=[r25],16;;
1149 ldf.fill.nta f18=[r25],16;;
1150 ldf.fill.nta f19=[r25],16;;
1151 ldf.fill.nta f20=[r25],16;;
1152 ldf.fill.nta f21=[r25],16;;
1153 ldf.fill.nta f22=[r25],16;;
1154 ldf.fill.nta f23=[r25],16;;
1155 ldf.fill.nta f24=[r25],16;;
1156 ldf.fill.nta f25=[r25],16;;
1157 ldf.fill.nta f26=[r25],16;;
1158 ldf.fill.nta f27=[r25],16;;
1159 ldf.fill.nta f28=[r25],16;;
1160 ldf.fill.nta f29=[r25],16;;
1161 ldf.fill.nta f30=[r25],16;;
1162 ldf.fill.nta f31=[r25],16;;
1164 /*
1165 * Now that we have done all the register restores
1166 * we are now ready for the big DIVE to SAL Land
1167 */
1168 ssm psr.ic;;
1169 srlz.d;;
1170 br.ret.sptk.many b0;;
1171 END(ia64_jump_to_sal)
1172 #endif /* CONFIG_HOTPLUG_CPU */
1174 #endif /* CONFIG_SMP */