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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 */
22
23
24#include <asm/asmmacro.h>
25#include <asm/fpu.h>
26#include <asm/kregs.h>
27#include <asm/mmu_context.h>
28#include <asm/asm-offsets.h>
29#include <asm/pal.h>
30#include <asm/pgtable.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 <asm/export.h>
37
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)
41
42#define SAVE_FROM_REG(src, ptr, dest) \
43 mov dest=src;; \
44 st8 [ptr]=dest,0x08
45
46#define RESTORE_REG(reg, ptr, _tmp) \
47 ld8 _tmp=[ptr],0x08;; \
48 mov reg=_tmp
49
50#define SAVE_BREAK_REGS(ptr, _idx, _breg, _dest)\
51 mov ar.lc=IA64_NUM_DBG_REGS-1;; \
52 mov _idx=0;; \
531: \
54 SAVE_FROM_REG(_breg[_idx], ptr, _dest);; \
55 add _idx=1,_idx;; \
56 br.cloop.sptk.many 1b
57
58#define RESTORE_BREAK_REGS(ptr, _idx, _breg, _tmp, _lbl)\
59 mov ar.lc=IA64_NUM_DBG_REGS-1;; \
60 mov _idx=0;; \
61_lbl: RESTORE_REG(_breg[_idx], ptr, _tmp);; \
62 add _idx=1, _idx;; \
63 br.cloop.sptk.many _lbl
64
65#define SAVE_ONE_RR(num, _reg, _tmp) \
66 movl _tmp=(num<<61);; \
67 mov _reg=rr[_tmp]
68
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);;
78
79#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
80 st8 [ptr]=_r0, 8;; \
81 st8 [ptr]=_r1, 8;; \
82 st8 [ptr]=_r2, 8;; \
83 st8 [ptr]=_r3, 8;; \
84 st8 [ptr]=_r4, 8;; \
85 st8 [ptr]=_r5, 8;; \
86 st8 [ptr]=_r6, 8;; \
87 st8 [ptr]=_r7, 8;;
88
89#define RESTORE_REGION_REGS(ptr, _idx1, _idx2, _tmp) \
90 mov ar.lc=0x08-1;; \
91 movl _idx1=0x00;; \
92RestRR: \
93 dep.z _idx2=_idx1,61,3;; \
94 ld8 _tmp=[ptr],8;; \
95 mov rr[_idx2]=_tmp;; \
96 srlz.d;; \
97 add _idx1=1,_idx1;; \
98 br.cloop.sptk.few RestRR
99
100#define SET_AREA_FOR_BOOTING_CPU(reg1, reg2) \
101 movl reg1=sal_state_for_booting_cpu;; \
102 ld8 reg2=[reg1];;
103
104/*
105 * Adjust region registers saved before starting to save
106 * break regs and rest of the states that need to be preserved.
107 */
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;;
157
158#else
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)
163#endif
164
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);; \
168 mov rr[_tmp1]=_tmp2
169
170 __PAGE_ALIGNED_DATA
171
172 .global empty_zero_page
173EXPORT_DATA_SYMBOL_GPL(empty_zero_page)
174empty_zero_page:
175 .skip PAGE_SIZE
176
177 .global swapper_pg_dir
178swapper_pg_dir:
179 .skip PAGE_SIZE
180
181 .rodata
182halt_msg:
183 stringz "Halting kernel\n"
184
185 __REF
186
187 .global start_ap
188
189 /*
190 * Start the kernel. When the bootloader passes control to _start(), r28
191 * points to the address of the boot parameter area. Execution reaches
192 * here in physical mode.
193 */
194GLOBAL_ENTRY(_start)
195start_ap:
196 .prologue
197 .save rp, r0 // terminate unwind chain with a NULL rp
198 .body
199
200 rsm psr.i | psr.ic
201 ;;
202 srlz.i
203 ;;
204 {
205 flushrs // must be first insn in group
206 srlz.i
207 }
208 ;;
209 /*
210 * Save the region registers, predicate before they get clobbered
211 */
212 SAVE_REGION_REGS(r2, r8,r9,r10,r11,r12,r13,r14,r15);
213 mov r25=pr;;
214
215 /*
216 * Initialize kernel region registers:
217 * rr[0]: VHPT enabled, page size = PAGE_SHIFT
218 * rr[1]: VHPT enabled, page size = PAGE_SHIFT
219 * rr[2]: VHPT enabled, page size = PAGE_SHIFT
220 * rr[3]: VHPT enabled, page size = PAGE_SHIFT
221 * rr[4]: VHPT enabled, page size = PAGE_SHIFT
222 * rr[5]: VHPT enabled, page size = PAGE_SHIFT
223 * rr[6]: VHPT disabled, page size = IA64_GRANULE_SHIFT
224 * rr[7]: VHPT disabled, page size = IA64_GRANULE_SHIFT
225 * We initialize all of them to prevent inadvertently assuming
226 * something about the state of address translation early in boot.
227 */
228 SET_ONE_RR(0, PAGE_SHIFT, r2, r16, 1);;
229 SET_ONE_RR(1, PAGE_SHIFT, r2, r16, 1);;
230 SET_ONE_RR(2, PAGE_SHIFT, r2, r16, 1);;
231 SET_ONE_RR(3, PAGE_SHIFT, r2, r16, 1);;
232 SET_ONE_RR(4, PAGE_SHIFT, r2, r16, 1);;
233 SET_ONE_RR(5, PAGE_SHIFT, r2, r16, 1);;
234 SET_ONE_RR(6, IA64_GRANULE_SHIFT, r2, r16, 0);;
235 SET_ONE_RR(7, IA64_GRANULE_SHIFT, r2, r16, 0);;
236 /*
237 * Now pin mappings into the TLB for kernel text and data
238 */
239 mov r18=KERNEL_TR_PAGE_SHIFT<<2
240 movl r17=KERNEL_START
241 ;;
242 mov cr.itir=r18
243 mov cr.ifa=r17
244 mov r16=IA64_TR_KERNEL
245 mov r3=ip
246 movl r18=PAGE_KERNEL
247 ;;
248 dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT
249 ;;
250 or r18=r2,r18
251 ;;
252 srlz.i
253 ;;
254 itr.i itr[r16]=r18
255 ;;
256 itr.d dtr[r16]=r18
257 ;;
258 srlz.i
259
260 /*
261 * Switch into virtual mode:
262 */
263 movl r16=(IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN \
264 |IA64_PSR_DI)
265 ;;
266 mov cr.ipsr=r16
267 movl r17=1f
268 ;;
269 mov cr.iip=r17
270 mov cr.ifs=r0
271 ;;
272 rfi
273 ;;
2741: // now we are in virtual mode
275
276 SET_AREA_FOR_BOOTING_CPU(r2, r16);
277
278 STORE_REGION_REGS(r16, r8,r9,r10,r11,r12,r13,r14,r15);
279 SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(r16,r17,r25)
280 ;;
281
282 // set IVT entry point---can't access I/O ports without it
283 movl r3=ia64_ivt
284 ;;
285 mov cr.iva=r3
286 movl r2=FPSR_DEFAULT
287 ;;
288 srlz.i
289 movl gp=__gp
290
291 mov ar.fpsr=r2
292 ;;
293
294#define isAP p2 // are we an Application Processor?
295#define isBP p3 // are we the Bootstrap Processor?
296
297#ifdef CONFIG_SMP
298 /*
299 * Find the init_task for the currently booting CPU. At poweron, and in
300 * UP mode, task_for_booting_cpu is NULL.
301 */
302 movl r3=task_for_booting_cpu
303 ;;
304 ld8 r3=[r3]
305 movl r2=init_task
306 ;;
307 cmp.eq isBP,isAP=r3,r0
308 ;;
309(isAP) mov r2=r3
310#else
311 movl r2=init_task
312 cmp.eq isBP,isAP=r0,r0
313#endif
314 ;;
315 tpa r3=r2 // r3 == phys addr of task struct
316 mov r16=-1
317(isBP) br.cond.dpnt .load_current // BP stack is on region 5 --- no need to map it
318
319 // load mapping for stack (virtaddr in r2, physaddr in r3)
320 rsm psr.ic
321 movl r17=PAGE_KERNEL
322 ;;
323 srlz.d
324 dep r18=0,r3,0,12
325 ;;
326 or r18=r17,r18
327 dep r2=-1,r3,61,3 // IMVA of task
328 ;;
329 mov r17=rr[r2]
330 shr.u r16=r3,IA64_GRANULE_SHIFT
331 ;;
332 dep r17=0,r17,8,24
333 ;;
334 mov cr.itir=r17
335 mov cr.ifa=r2
336
337 mov r19=IA64_TR_CURRENT_STACK
338 ;;
339 itr.d dtr[r19]=r18
340 ;;
341 ssm psr.ic
342 srlz.d
343 ;;
344
345.load_current:
346 // load the "current" pointer (r13) and ar.k6 with the current task
347 mov IA64_KR(CURRENT)=r2 // virtual address
348 mov IA64_KR(CURRENT_STACK)=r16
349 mov r13=r2
350 /*
351 * Reserve space at the top of the stack for "struct pt_regs". Kernel
352 * threads don't store interesting values in that structure, but the space
353 * still needs to be there because time-critical stuff such as the context
354 * switching can be implemented more efficiently (for example, __switch_to()
355 * always sets the psr.dfh bit of the task it is switching to).
356 */
357
358 addl r12=IA64_STK_OFFSET-IA64_PT_REGS_SIZE-16,r2
359 addl r2=IA64_RBS_OFFSET,r2 // initialize the RSE
360 mov ar.rsc=0 // place RSE in enforced lazy mode
361 ;;
362 loadrs // clear the dirty partition
363 movl r19=__phys_per_cpu_start
364 mov r18=PERCPU_PAGE_SIZE
365 ;;
366#ifndef CONFIG_SMP
367 add r19=r19,r18
368 ;;
369#else
370(isAP) br.few 2f
371 movl r20=__cpu0_per_cpu
372 ;;
373 shr.u r18=r18,3
3741:
375 ld8 r21=[r19],8;;
376 st8[r20]=r21,8
377 adds r18=-1,r18;;
378 cmp4.lt p7,p6=0,r18
379(p7) br.cond.dptk.few 1b
380 mov r19=r20
381 ;;
3822:
383#endif
384 tpa r19=r19
385 ;;
386 .pred.rel.mutex isBP,isAP
387(isBP) mov IA64_KR(PER_CPU_DATA)=r19 // per-CPU base for cpu0
388(isAP) mov IA64_KR(PER_CPU_DATA)=r0 // clear physical per-CPU base
389 ;;
390 mov ar.bspstore=r2 // establish the new RSE stack
391 ;;
392 mov ar.rsc=0x3 // place RSE in eager mode
393
394(isBP) dep r28=-1,r28,61,3 // make address virtual
395(isBP) movl r2=ia64_boot_param
396 ;;
397(isBP) st8 [r2]=r28 // save the address of the boot param area passed by the bootloader
398
399#ifdef CONFIG_SMP
400(isAP) br.call.sptk.many rp=start_secondary
401.ret0:
402(isAP) br.cond.sptk self
403#endif
404
405 // This is executed by the bootstrap processor (bsp) only:
406
407#ifdef CONFIG_IA64_FW_EMU
408 // initialize PAL & SAL emulator:
409 br.call.sptk.many rp=sys_fw_init
410.ret1:
411#endif
412 br.call.sptk.many rp=start_kernel
413.ret2: addl r3=@ltoff(halt_msg),gp
414 ;;
415 alloc r2=ar.pfs,8,0,2,0
416 ;;
417 ld8 out0=[r3]
418 br.call.sptk.many b0=console_print
419
420self: hint @pause
421 br.sptk.many self // endless loop
422END(_start)
423
424 .text
425
426GLOBAL_ENTRY(ia64_save_debug_regs)
427 alloc r16=ar.pfs,1,0,0,0
428 mov r20=ar.lc // preserve ar.lc
429 mov ar.lc=IA64_NUM_DBG_REGS-1
430 mov r18=0
431 add r19=IA64_NUM_DBG_REGS*8,in0
432 ;;
4331: mov r16=dbr[r18]
434#ifdef CONFIG_ITANIUM
435 ;;
436 srlz.d
437#endif
438 mov r17=ibr[r18]
439 add r18=1,r18
440 ;;
441 st8.nta [in0]=r16,8
442 st8.nta [r19]=r17,8
443 br.cloop.sptk.many 1b
444 ;;
445 mov ar.lc=r20 // restore ar.lc
446 br.ret.sptk.many rp
447END(ia64_save_debug_regs)
448
449GLOBAL_ENTRY(ia64_load_debug_regs)
450 alloc r16=ar.pfs,1,0,0,0
451 lfetch.nta [in0]
452 mov r20=ar.lc // preserve ar.lc
453 add r19=IA64_NUM_DBG_REGS*8,in0
454 mov ar.lc=IA64_NUM_DBG_REGS-1
455 mov r18=-1
456 ;;
4571: ld8.nta r16=[in0],8
458 ld8.nta r17=[r19],8
459 add r18=1,r18
460 ;;
461 mov dbr[r18]=r16
462#ifdef CONFIG_ITANIUM
463 ;;
464 srlz.d // Errata 132 (NoFix status)
465#endif
466 mov ibr[r18]=r17
467 br.cloop.sptk.many 1b
468 ;;
469 mov ar.lc=r20 // restore ar.lc
470 br.ret.sptk.many rp
471END(ia64_load_debug_regs)
472
473GLOBAL_ENTRY(__ia64_save_fpu)
474 alloc r2=ar.pfs,1,4,0,0
475 adds loc0=96*16-16,in0
476 adds loc1=96*16-16-128,in0
477 ;;
478 stf.spill.nta [loc0]=f127,-256
479 stf.spill.nta [loc1]=f119,-256
480 ;;
481 stf.spill.nta [loc0]=f111,-256
482 stf.spill.nta [loc1]=f103,-256
483 ;;
484 stf.spill.nta [loc0]=f95,-256
485 stf.spill.nta [loc1]=f87,-256
486 ;;
487 stf.spill.nta [loc0]=f79,-256
488 stf.spill.nta [loc1]=f71,-256
489 ;;
490 stf.spill.nta [loc0]=f63,-256
491 stf.spill.nta [loc1]=f55,-256
492 adds loc2=96*16-32,in0
493 ;;
494 stf.spill.nta [loc0]=f47,-256
495 stf.spill.nta [loc1]=f39,-256
496 adds loc3=96*16-32-128,in0
497 ;;
498 stf.spill.nta [loc2]=f126,-256
499 stf.spill.nta [loc3]=f118,-256
500 ;;
501 stf.spill.nta [loc2]=f110,-256
502 stf.spill.nta [loc3]=f102,-256
503 ;;
504 stf.spill.nta [loc2]=f94,-256
505 stf.spill.nta [loc3]=f86,-256
506 ;;
507 stf.spill.nta [loc2]=f78,-256
508 stf.spill.nta [loc3]=f70,-256
509 ;;
510 stf.spill.nta [loc2]=f62,-256
511 stf.spill.nta [loc3]=f54,-256
512 adds loc0=96*16-48,in0
513 ;;
514 stf.spill.nta [loc2]=f46,-256
515 stf.spill.nta [loc3]=f38,-256
516 adds loc1=96*16-48-128,in0
517 ;;
518 stf.spill.nta [loc0]=f125,-256
519 stf.spill.nta [loc1]=f117,-256
520 ;;
521 stf.spill.nta [loc0]=f109,-256
522 stf.spill.nta [loc1]=f101,-256
523 ;;
524 stf.spill.nta [loc0]=f93,-256
525 stf.spill.nta [loc1]=f85,-256
526 ;;
527 stf.spill.nta [loc0]=f77,-256
528 stf.spill.nta [loc1]=f69,-256
529 ;;
530 stf.spill.nta [loc0]=f61,-256
531 stf.spill.nta [loc1]=f53,-256
532 adds loc2=96*16-64,in0
533 ;;
534 stf.spill.nta [loc0]=f45,-256
535 stf.spill.nta [loc1]=f37,-256
536 adds loc3=96*16-64-128,in0
537 ;;
538 stf.spill.nta [loc2]=f124,-256
539 stf.spill.nta [loc3]=f116,-256
540 ;;
541 stf.spill.nta [loc2]=f108,-256
542 stf.spill.nta [loc3]=f100,-256
543 ;;
544 stf.spill.nta [loc2]=f92,-256
545 stf.spill.nta [loc3]=f84,-256
546 ;;
547 stf.spill.nta [loc2]=f76,-256
548 stf.spill.nta [loc3]=f68,-256
549 ;;
550 stf.spill.nta [loc2]=f60,-256
551 stf.spill.nta [loc3]=f52,-256
552 adds loc0=96*16-80,in0
553 ;;
554 stf.spill.nta [loc2]=f44,-256
555 stf.spill.nta [loc3]=f36,-256
556 adds loc1=96*16-80-128,in0
557 ;;
558 stf.spill.nta [loc0]=f123,-256
559 stf.spill.nta [loc1]=f115,-256
560 ;;
561 stf.spill.nta [loc0]=f107,-256
562 stf.spill.nta [loc1]=f99,-256
563 ;;
564 stf.spill.nta [loc0]=f91,-256
565 stf.spill.nta [loc1]=f83,-256
566 ;;
567 stf.spill.nta [loc0]=f75,-256
568 stf.spill.nta [loc1]=f67,-256
569 ;;
570 stf.spill.nta [loc0]=f59,-256
571 stf.spill.nta [loc1]=f51,-256
572 adds loc2=96*16-96,in0
573 ;;
574 stf.spill.nta [loc0]=f43,-256
575 stf.spill.nta [loc1]=f35,-256
576 adds loc3=96*16-96-128,in0
577 ;;
578 stf.spill.nta [loc2]=f122,-256
579 stf.spill.nta [loc3]=f114,-256
580 ;;
581 stf.spill.nta [loc2]=f106,-256
582 stf.spill.nta [loc3]=f98,-256
583 ;;
584 stf.spill.nta [loc2]=f90,-256
585 stf.spill.nta [loc3]=f82,-256
586 ;;
587 stf.spill.nta [loc2]=f74,-256
588 stf.spill.nta [loc3]=f66,-256
589 ;;
590 stf.spill.nta [loc2]=f58,-256
591 stf.spill.nta [loc3]=f50,-256
592 adds loc0=96*16-112,in0
593 ;;
594 stf.spill.nta [loc2]=f42,-256
595 stf.spill.nta [loc3]=f34,-256
596 adds loc1=96*16-112-128,in0
597 ;;
598 stf.spill.nta [loc0]=f121,-256
599 stf.spill.nta [loc1]=f113,-256
600 ;;
601 stf.spill.nta [loc0]=f105,-256
602 stf.spill.nta [loc1]=f97,-256
603 ;;
604 stf.spill.nta [loc0]=f89,-256
605 stf.spill.nta [loc1]=f81,-256
606 ;;
607 stf.spill.nta [loc0]=f73,-256
608 stf.spill.nta [loc1]=f65,-256
609 ;;
610 stf.spill.nta [loc0]=f57,-256
611 stf.spill.nta [loc1]=f49,-256
612 adds loc2=96*16-128,in0
613 ;;
614 stf.spill.nta [loc0]=f41,-256
615 stf.spill.nta [loc1]=f33,-256
616 adds loc3=96*16-128-128,in0
617 ;;
618 stf.spill.nta [loc2]=f120,-256
619 stf.spill.nta [loc3]=f112,-256
620 ;;
621 stf.spill.nta [loc2]=f104,-256
622 stf.spill.nta [loc3]=f96,-256
623 ;;
624 stf.spill.nta [loc2]=f88,-256
625 stf.spill.nta [loc3]=f80,-256
626 ;;
627 stf.spill.nta [loc2]=f72,-256
628 stf.spill.nta [loc3]=f64,-256
629 ;;
630 stf.spill.nta [loc2]=f56,-256
631 stf.spill.nta [loc3]=f48,-256
632 ;;
633 stf.spill.nta [loc2]=f40
634 stf.spill.nta [loc3]=f32
635 br.ret.sptk.many rp
636END(__ia64_save_fpu)
637
638GLOBAL_ENTRY(__ia64_load_fpu)
639 alloc r2=ar.pfs,1,2,0,0
640 adds r3=128,in0
641 adds r14=256,in0
642 adds r15=384,in0
643 mov loc0=512
644 mov loc1=-1024+16
645 ;;
646 ldf.fill.nta f32=[in0],loc0
647 ldf.fill.nta f40=[ r3],loc0
648 ldf.fill.nta f48=[r14],loc0
649 ldf.fill.nta f56=[r15],loc0
650 ;;
651 ldf.fill.nta f64=[in0],loc0
652 ldf.fill.nta f72=[ r3],loc0
653 ldf.fill.nta f80=[r14],loc0
654 ldf.fill.nta f88=[r15],loc0
655 ;;
656 ldf.fill.nta f96=[in0],loc1
657 ldf.fill.nta f104=[ r3],loc1
658 ldf.fill.nta f112=[r14],loc1
659 ldf.fill.nta f120=[r15],loc1
660 ;;
661 ldf.fill.nta f33=[in0],loc0
662 ldf.fill.nta f41=[ r3],loc0
663 ldf.fill.nta f49=[r14],loc0
664 ldf.fill.nta f57=[r15],loc0
665 ;;
666 ldf.fill.nta f65=[in0],loc0
667 ldf.fill.nta f73=[ r3],loc0
668 ldf.fill.nta f81=[r14],loc0
669 ldf.fill.nta f89=[r15],loc0
670 ;;
671 ldf.fill.nta f97=[in0],loc1
672 ldf.fill.nta f105=[ r3],loc1
673 ldf.fill.nta f113=[r14],loc1
674 ldf.fill.nta f121=[r15],loc1
675 ;;
676 ldf.fill.nta f34=[in0],loc0
677 ldf.fill.nta f42=[ r3],loc0
678 ldf.fill.nta f50=[r14],loc0
679 ldf.fill.nta f58=[r15],loc0
680 ;;
681 ldf.fill.nta f66=[in0],loc0
682 ldf.fill.nta f74=[ r3],loc0
683 ldf.fill.nta f82=[r14],loc0
684 ldf.fill.nta f90=[r15],loc0
685 ;;
686 ldf.fill.nta f98=[in0],loc1
687 ldf.fill.nta f106=[ r3],loc1
688 ldf.fill.nta f114=[r14],loc1
689 ldf.fill.nta f122=[r15],loc1
690 ;;
691 ldf.fill.nta f35=[in0],loc0
692 ldf.fill.nta f43=[ r3],loc0
693 ldf.fill.nta f51=[r14],loc0
694 ldf.fill.nta f59=[r15],loc0
695 ;;
696 ldf.fill.nta f67=[in0],loc0
697 ldf.fill.nta f75=[ r3],loc0
698 ldf.fill.nta f83=[r14],loc0
699 ldf.fill.nta f91=[r15],loc0
700 ;;
701 ldf.fill.nta f99=[in0],loc1
702 ldf.fill.nta f107=[ r3],loc1
703 ldf.fill.nta f115=[r14],loc1
704 ldf.fill.nta f123=[r15],loc1
705 ;;
706 ldf.fill.nta f36=[in0],loc0
707 ldf.fill.nta f44=[ r3],loc0
708 ldf.fill.nta f52=[r14],loc0
709 ldf.fill.nta f60=[r15],loc0
710 ;;
711 ldf.fill.nta f68=[in0],loc0
712 ldf.fill.nta f76=[ r3],loc0
713 ldf.fill.nta f84=[r14],loc0
714 ldf.fill.nta f92=[r15],loc0
715 ;;
716 ldf.fill.nta f100=[in0],loc1
717 ldf.fill.nta f108=[ r3],loc1
718 ldf.fill.nta f116=[r14],loc1
719 ldf.fill.nta f124=[r15],loc1
720 ;;
721 ldf.fill.nta f37=[in0],loc0
722 ldf.fill.nta f45=[ r3],loc0
723 ldf.fill.nta f53=[r14],loc0
724 ldf.fill.nta f61=[r15],loc0
725 ;;
726 ldf.fill.nta f69=[in0],loc0
727 ldf.fill.nta f77=[ r3],loc0
728 ldf.fill.nta f85=[r14],loc0
729 ldf.fill.nta f93=[r15],loc0
730 ;;
731 ldf.fill.nta f101=[in0],loc1
732 ldf.fill.nta f109=[ r3],loc1
733 ldf.fill.nta f117=[r14],loc1
734 ldf.fill.nta f125=[r15],loc1
735 ;;
736 ldf.fill.nta f38 =[in0],loc0
737 ldf.fill.nta f46 =[ r3],loc0
738 ldf.fill.nta f54 =[r14],loc0
739 ldf.fill.nta f62 =[r15],loc0
740 ;;
741 ldf.fill.nta f70 =[in0],loc0
742 ldf.fill.nta f78 =[ r3],loc0
743 ldf.fill.nta f86 =[r14],loc0
744 ldf.fill.nta f94 =[r15],loc0
745 ;;
746 ldf.fill.nta f102=[in0],loc1
747 ldf.fill.nta f110=[ r3],loc1
748 ldf.fill.nta f118=[r14],loc1
749 ldf.fill.nta f126=[r15],loc1
750 ;;
751 ldf.fill.nta f39 =[in0],loc0
752 ldf.fill.nta f47 =[ r3],loc0
753 ldf.fill.nta f55 =[r14],loc0
754 ldf.fill.nta f63 =[r15],loc0
755 ;;
756 ldf.fill.nta f71 =[in0],loc0
757 ldf.fill.nta f79 =[ r3],loc0
758 ldf.fill.nta f87 =[r14],loc0
759 ldf.fill.nta f95 =[r15],loc0
760 ;;
761 ldf.fill.nta f103=[in0]
762 ldf.fill.nta f111=[ r3]
763 ldf.fill.nta f119=[r14]
764 ldf.fill.nta f127=[r15]
765 br.ret.sptk.many rp
766END(__ia64_load_fpu)
767
768GLOBAL_ENTRY(__ia64_init_fpu)
769 stf.spill [sp]=f0 // M3
770 mov f32=f0 // F
771 nop.b 0
772
773 ldfps f33,f34=[sp] // M0
774 ldfps f35,f36=[sp] // M1
775 mov f37=f0 // F
776 ;;
777
778 setf.s f38=r0 // M2
779 setf.s f39=r0 // M3
780 mov f40=f0 // F
781
782 ldfps f41,f42=[sp] // M0
783 ldfps f43,f44=[sp] // M1
784 mov f45=f0 // F
785
786 setf.s f46=r0 // M2
787 setf.s f47=r0 // M3
788 mov f48=f0 // F
789
790 ldfps f49,f50=[sp] // M0
791 ldfps f51,f52=[sp] // M1
792 mov f53=f0 // F
793
794 setf.s f54=r0 // M2
795 setf.s f55=r0 // M3
796 mov f56=f0 // F
797
798 ldfps f57,f58=[sp] // M0
799 ldfps f59,f60=[sp] // M1
800 mov f61=f0 // F
801
802 setf.s f62=r0 // M2
803 setf.s f63=r0 // M3
804 mov f64=f0 // F
805
806 ldfps f65,f66=[sp] // M0
807 ldfps f67,f68=[sp] // M1
808 mov f69=f0 // F
809
810 setf.s f70=r0 // M2
811 setf.s f71=r0 // M3
812 mov f72=f0 // F
813
814 ldfps f73,f74=[sp] // M0
815 ldfps f75,f76=[sp] // M1
816 mov f77=f0 // F
817
818 setf.s f78=r0 // M2
819 setf.s f79=r0 // M3
820 mov f80=f0 // F
821
822 ldfps f81,f82=[sp] // M0
823 ldfps f83,f84=[sp] // M1
824 mov f85=f0 // F
825
826 setf.s f86=r0 // M2
827 setf.s f87=r0 // M3
828 mov f88=f0 // F
829
830 /*
831 * When the instructions are cached, it would be faster to initialize
832 * the remaining registers with simply mov instructions (F-unit).
833 * This gets the time down to ~29 cycles. However, this would use up
834 * 33 bundles, whereas continuing with the above pattern yields
835 * 10 bundles and ~30 cycles.
836 */
837
838 ldfps f89,f90=[sp] // M0
839 ldfps f91,f92=[sp] // M1
840 mov f93=f0 // F
841
842 setf.s f94=r0 // M2
843 setf.s f95=r0 // M3
844 mov f96=f0 // F
845
846 ldfps f97,f98=[sp] // M0
847 ldfps f99,f100=[sp] // M1
848 mov f101=f0 // F
849
850 setf.s f102=r0 // M2
851 setf.s f103=r0 // M3
852 mov f104=f0 // F
853
854 ldfps f105,f106=[sp] // M0
855 ldfps f107,f108=[sp] // M1
856 mov f109=f0 // F
857
858 setf.s f110=r0 // M2
859 setf.s f111=r0 // M3
860 mov f112=f0 // F
861
862 ldfps f113,f114=[sp] // M0
863 ldfps f115,f116=[sp] // M1
864 mov f117=f0 // F
865
866 setf.s f118=r0 // M2
867 setf.s f119=r0 // M3
868 mov f120=f0 // F
869
870 ldfps f121,f122=[sp] // M0
871 ldfps f123,f124=[sp] // M1
872 mov f125=f0 // F
873
874 setf.s f126=r0 // M2
875 setf.s f127=r0 // M3
876 br.ret.sptk.many rp // F
877END(__ia64_init_fpu)
878
879/*
880 * Switch execution mode from virtual to physical
881 *
882 * Inputs:
883 * r16 = new psr to establish
884 * Output:
885 * r19 = old virtual address of ar.bsp
886 * r20 = old virtual address of sp
887 *
888 * Note: RSE must already be in enforced lazy mode
889 */
890GLOBAL_ENTRY(ia64_switch_mode_phys)
891 {
892 rsm psr.i | psr.ic // disable interrupts and interrupt collection
893 mov r15=ip
894 }
895 ;;
896 {
897 flushrs // must be first insn in group
898 srlz.i
899 }
900 ;;
901 mov cr.ipsr=r16 // set new PSR
902 add r3=1f-ia64_switch_mode_phys,r15
903
904 mov r19=ar.bsp
905 mov r20=sp
906 mov r14=rp // get return address into a general register
907 ;;
908
909 // going to physical mode, use tpa to translate virt->phys
910 tpa r17=r19
911 tpa r3=r3
912 tpa sp=sp
913 tpa r14=r14
914 ;;
915
916 mov r18=ar.rnat // save ar.rnat
917 mov ar.bspstore=r17 // this steps on ar.rnat
918 mov cr.iip=r3
919 mov cr.ifs=r0
920 ;;
921 mov ar.rnat=r18 // restore ar.rnat
922 rfi // must be last insn in group
923 ;;
9241: mov rp=r14
925 br.ret.sptk.many rp
926END(ia64_switch_mode_phys)
927
928/*
929 * Switch execution mode from physical to virtual
930 *
931 * Inputs:
932 * r16 = new psr to establish
933 * r19 = new bspstore to establish
934 * r20 = new sp to establish
935 *
936 * Note: RSE must already be in enforced lazy mode
937 */
938GLOBAL_ENTRY(ia64_switch_mode_virt)
939 {
940 rsm psr.i | psr.ic // disable interrupts and interrupt collection
941 mov r15=ip
942 }
943 ;;
944 {
945 flushrs // must be first insn in group
946 srlz.i
947 }
948 ;;
949 mov cr.ipsr=r16 // set new PSR
950 add r3=1f-ia64_switch_mode_virt,r15
951
952 mov r14=rp // get return address into a general register
953 ;;
954
955 // going to virtual
956 // - for code addresses, set upper bits of addr to KERNEL_START
957 // - for stack addresses, copy from input argument
958 movl r18=KERNEL_START
959 dep r3=0,r3,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
960 dep r14=0,r14,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
961 mov sp=r20
962 ;;
963 or r3=r3,r18
964 or r14=r14,r18
965 ;;
966
967 mov r18=ar.rnat // save ar.rnat
968 mov ar.bspstore=r19 // this steps on ar.rnat
969 mov cr.iip=r3
970 mov cr.ifs=r0
971 ;;
972 mov ar.rnat=r18 // restore ar.rnat
973 rfi // must be last insn in group
974 ;;
9751: mov rp=r14
976 br.ret.sptk.many rp
977END(ia64_switch_mode_virt)
978
979GLOBAL_ENTRY(ia64_delay_loop)
980 .prologue
981{ nop 0 // work around GAS unwind info generation bug...
982 .save ar.lc,r2
983 mov r2=ar.lc
984 .body
985 ;;
986 mov ar.lc=r32
987}
988 ;;
989 // force loop to be 32-byte aligned (GAS bug means we cannot use .align
990 // inside function body without corrupting unwind info).
991{ nop 0 }
9921: br.cloop.sptk.few 1b
993 ;;
994 mov ar.lc=r2
995 br.ret.sptk.many rp
996END(ia64_delay_loop)
997
998/*
999 * Return a CPU-local timestamp in nano-seconds. This timestamp is
1000 * NOT synchronized across CPUs its return value must never be
1001 * compared against the values returned on another CPU. The usage in
1002 * kernel/sched/core.c ensures that.
1003 *
1004 * The return-value of sched_clock() is NOT supposed to wrap-around.
1005 * If it did, it would cause some scheduling hiccups (at the worst).
1006 * Fortunately, with a 64-bit cycle-counter ticking at 100GHz, even
1007 * that would happen only once every 5+ years.
1008 *
1009 * The code below basically calculates:
1010 *
1011 * (ia64_get_itc() * local_cpu_data->nsec_per_cyc) >> IA64_NSEC_PER_CYC_SHIFT
1012 *
1013 * except that the multiplication and the shift are done with 128-bit
1014 * intermediate precision so that we can produce a full 64-bit result.
1015 */
1016GLOBAL_ENTRY(ia64_native_sched_clock)
1017 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1018 mov.m r9=ar.itc // fetch cycle-counter (35 cyc)
1019 ;;
1020 ldf8 f8=[r8]
1021 ;;
1022 setf.sig f9=r9 // certain to stall, so issue it _after_ ldf8...
1023 ;;
1024 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1025 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1026 ;;
1027 getf.sig r8=f10 // (5 cyc)
1028 getf.sig r9=f11
1029 ;;
1030 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1031 br.ret.sptk.many rp
1032END(ia64_native_sched_clock)
1033
1034#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1035GLOBAL_ENTRY(cycle_to_nsec)
1036 alloc r16=ar.pfs,1,0,0,0
1037 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1038 ;;
1039 ldf8 f8=[r8]
1040 ;;
1041 setf.sig f9=r32
1042 ;;
1043 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1044 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1045 ;;
1046 getf.sig r8=f10 // (5 cyc)
1047 getf.sig r9=f11
1048 ;;
1049 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1050 br.ret.sptk.many rp
1051END(cycle_to_nsec)
1052#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
1053
1054#ifdef CONFIG_IA64_BRL_EMU
1055
1056/*
1057 * Assembly routines used by brl_emu.c to set preserved register state.
1058 */
1059
1060#define SET_REG(reg) \
1061 GLOBAL_ENTRY(ia64_set_##reg); \
1062 alloc r16=ar.pfs,1,0,0,0; \
1063 mov reg=r32; \
1064 ;; \
1065 br.ret.sptk.many rp; \
1066 END(ia64_set_##reg)
1067
1068SET_REG(b1);
1069SET_REG(b2);
1070SET_REG(b3);
1071SET_REG(b4);
1072SET_REG(b5);
1073
1074#endif /* CONFIG_IA64_BRL_EMU */
1075
1076#ifdef CONFIG_SMP
1077
1078#ifdef CONFIG_HOTPLUG_CPU
1079GLOBAL_ENTRY(ia64_jump_to_sal)
1080 alloc r16=ar.pfs,1,0,0,0;;
1081 rsm psr.i | psr.ic
1082{
1083 flushrs
1084 srlz.i
1085}
1086 tpa r25=in0
1087 movl r18=tlb_purge_done;;
1088 DATA_VA_TO_PA(r18);;
1089 mov b1=r18 // Return location
1090 movl r18=ia64_do_tlb_purge;;
1091 DATA_VA_TO_PA(r18);;
1092 mov b2=r18 // doing tlb_flush work
1093 mov ar.rsc=0 // Put RSE in enforced lazy, LE mode
1094 movl r17=1f;;
1095 DATA_VA_TO_PA(r17);;
1096 mov cr.iip=r17
1097 movl r16=SAL_PSR_BITS_TO_SET;;
1098 mov cr.ipsr=r16
1099 mov cr.ifs=r0;;
1100 rfi;; // note: this unmask MCA/INIT (psr.mc)
11011:
1102 /*
1103 * Invalidate all TLB data/inst
1104 */
1105 br.sptk.many b2;; // jump to tlb purge code
1106
1107tlb_purge_done:
1108 RESTORE_REGION_REGS(r25, r17,r18,r19);;
1109 RESTORE_REG(b0, r25, r17);;
1110 RESTORE_REG(b1, r25, r17);;
1111 RESTORE_REG(b2, r25, r17);;
1112 RESTORE_REG(b3, r25, r17);;
1113 RESTORE_REG(b4, r25, r17);;
1114 RESTORE_REG(b5, r25, r17);;
1115 ld8 r1=[r25],0x08;;
1116 ld8 r12=[r25],0x08;;
1117 ld8 r13=[r25],0x08;;
1118 RESTORE_REG(ar.fpsr, r25, r17);;
1119 RESTORE_REG(ar.pfs, r25, r17);;
1120 RESTORE_REG(ar.rnat, r25, r17);;
1121 RESTORE_REG(ar.unat, r25, r17);;
1122 RESTORE_REG(ar.bspstore, r25, r17);;
1123 RESTORE_REG(cr.dcr, r25, r17);;
1124 RESTORE_REG(cr.iva, r25, r17);;
1125 RESTORE_REG(cr.pta, r25, r17);;
1126 srlz.d;; // required not to violate RAW dependency
1127 RESTORE_REG(cr.itv, r25, r17);;
1128 RESTORE_REG(cr.pmv, r25, r17);;
1129 RESTORE_REG(cr.cmcv, r25, r17);;
1130 RESTORE_REG(cr.lrr0, r25, r17);;
1131 RESTORE_REG(cr.lrr1, r25, r17);;
1132 ld8 r4=[r25],0x08;;
1133 ld8 r5=[r25],0x08;;
1134 ld8 r6=[r25],0x08;;
1135 ld8 r7=[r25],0x08;;
1136 ld8 r17=[r25],0x08;;
1137 mov pr=r17,-1;;
1138 RESTORE_REG(ar.lc, r25, r17);;
1139 /*
1140 * Now Restore floating point regs
1141 */
1142 ldf.fill.nta f2=[r25],16;;
1143 ldf.fill.nta f3=[r25],16;;
1144 ldf.fill.nta f4=[r25],16;;
1145 ldf.fill.nta f5=[r25],16;;
1146 ldf.fill.nta f16=[r25],16;;
1147 ldf.fill.nta f17=[r25],16;;
1148 ldf.fill.nta f18=[r25],16;;
1149 ldf.fill.nta f19=[r25],16;;
1150 ldf.fill.nta f20=[r25],16;;
1151 ldf.fill.nta f21=[r25],16;;
1152 ldf.fill.nta f22=[r25],16;;
1153 ldf.fill.nta f23=[r25],16;;
1154 ldf.fill.nta f24=[r25],16;;
1155 ldf.fill.nta f25=[r25],16;;
1156 ldf.fill.nta f26=[r25],16;;
1157 ldf.fill.nta f27=[r25],16;;
1158 ldf.fill.nta f28=[r25],16;;
1159 ldf.fill.nta f29=[r25],16;;
1160 ldf.fill.nta f30=[r25],16;;
1161 ldf.fill.nta f31=[r25],16;;
1162
1163 /*
1164 * Now that we have done all the register restores
1165 * we are now ready for the big DIVE to SAL Land
1166 */
1167 ssm psr.ic;;
1168 srlz.d;;
1169 br.ret.sptk.many b0;;
1170END(ia64_jump_to_sal)
1171#endif /* CONFIG_HOTPLUG_CPU */
1172
1173#endif /* CONFIG_SMP */