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1/*
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
6 * entry point.
7 *
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
20 */
21
22
23#include <asm/asmmacro.h>
24#include <asm/fpu.h>
25#include <asm/kregs.h>
26#include <asm/mmu_context.h>
27#include <asm/asm-offsets.h>
28#include <asm/pal.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>
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
173empty_zero_page:
174 .skip PAGE_SIZE
175
176 .global swapper_pg_dir
177swapper_pg_dir:
178 .skip PAGE_SIZE
179
180 .rodata
181halt_msg:
182 stringz "Halting kernel\n"
183
184 __REF
185
186 .global start_ap
187
188 /*
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.
192 */
193GLOBAL_ENTRY(_start)
194start_ap:
195 .prologue
196 .save rp, r0 // terminate unwind chain with a NULL rp
197 .body
198
199 rsm psr.i | psr.ic
200 ;;
201 srlz.i
202 ;;
203 {
204 flushrs // must be first insn in group
205 srlz.i
206 }
207 ;;
208 /*
209 * Save the region registers, predicate before they get clobbered
210 */
211 SAVE_REGION_REGS(r2, r8,r9,r10,r11,r12,r13,r14,r15);
212 mov r25=pr;;
213
214 /*
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.
226 */
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);;
235 /*
236 * Now pin mappings into the TLB for kernel text and data
237 */
238 mov r18=KERNEL_TR_PAGE_SHIFT<<2
239 movl r17=KERNEL_START
240 ;;
241 mov cr.itir=r18
242 mov cr.ifa=r17
243 mov r16=IA64_TR_KERNEL
244 mov r3=ip
245 movl r18=PAGE_KERNEL
246 ;;
247 dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT
248 ;;
249 or r18=r2,r18
250 ;;
251 srlz.i
252 ;;
253 itr.i itr[r16]=r18
254 ;;
255 itr.d dtr[r16]=r18
256 ;;
257 srlz.i
258
259 /*
260 * Switch into virtual mode:
261 */
262 movl r16=(IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN \
263 |IA64_PSR_DI|IA64_PSR_AC)
264 ;;
265 mov cr.ipsr=r16
266 movl r17=1f
267 ;;
268 mov cr.iip=r17
269 mov cr.ifs=r0
270 ;;
271 rfi
272 ;;
2731: // now we are in virtual mode
274
275 SET_AREA_FOR_BOOTING_CPU(r2, r16);
276
277 STORE_REGION_REGS(r16, r8,r9,r10,r11,r12,r13,r14,r15);
278 SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(r16,r17,r25)
279 ;;
280
281 // set IVT entry point---can't access I/O ports without it
282 movl r3=ia64_ivt
283 ;;
284 mov cr.iva=r3
285 movl r2=FPSR_DEFAULT
286 ;;
287 srlz.i
288 movl gp=__gp
289
290 mov ar.fpsr=r2
291 ;;
292
293#define isAP p2 // are we an Application Processor?
294#define isBP p3 // are we the Bootstrap Processor?
295
296#ifdef CONFIG_SMP
297 /*
298 * Find the init_task for the currently booting CPU. At poweron, and in
299 * UP mode, task_for_booting_cpu is NULL.
300 */
301 movl r3=task_for_booting_cpu
302 ;;
303 ld8 r3=[r3]
304 movl r2=init_task
305 ;;
306 cmp.eq isBP,isAP=r3,r0
307 ;;
308(isAP) mov r2=r3
309#else
310 movl r2=init_task
311 cmp.eq isBP,isAP=r0,r0
312#endif
313 ;;
314 tpa r3=r2 // r3 == phys addr of task struct
315 mov r16=-1
316(isBP) br.cond.dpnt .load_current // BP stack is on region 5 --- no need to map it
317
318 // load mapping for stack (virtaddr in r2, physaddr in r3)
319 rsm psr.ic
320 movl r17=PAGE_KERNEL
321 ;;
322 srlz.d
323 dep r18=0,r3,0,12
324 ;;
325 or r18=r17,r18
326 dep r2=-1,r3,61,3 // IMVA of task
327 ;;
328 mov r17=rr[r2]
329 shr.u r16=r3,IA64_GRANULE_SHIFT
330 ;;
331 dep r17=0,r17,8,24
332 ;;
333 mov cr.itir=r17
334 mov cr.ifa=r2
335
336 mov r19=IA64_TR_CURRENT_STACK
337 ;;
338 itr.d dtr[r19]=r18
339 ;;
340 ssm psr.ic
341 srlz.d
342 ;;
343
344.load_current:
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
348 mov r13=r2
349 /*
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).
355 */
356
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
360 ;;
361 loadrs // clear the dirty partition
362 movl r19=__phys_per_cpu_start
363 mov r18=PERCPU_PAGE_SIZE
364 ;;
365#ifndef CONFIG_SMP
366 add r19=r19,r18
367 ;;
368#else
369(isAP) br.few 2f
370 movl r20=__cpu0_per_cpu
371 ;;
372 shr.u r18=r18,3
3731:
374 ld8 r21=[r19],8;;
375 st8[r20]=r21,8
376 adds r18=-1,r18;;
377 cmp4.lt p7,p6=0,r18
378(p7) br.cond.dptk.few 1b
379 mov r19=r20
380 ;;
3812:
382#endif
383 tpa r19=r19
384 ;;
385 .pred.rel.mutex isBP,isAP
386(isBP) mov IA64_KR(PER_CPU_DATA)=r19 // per-CPU base for cpu0
387(isAP) mov IA64_KR(PER_CPU_DATA)=r0 // clear physical per-CPU base
388 ;;
389 mov ar.bspstore=r2 // establish the new RSE stack
390 ;;
391 mov ar.rsc=0x3 // place RSE in eager mode
392
393(isBP) dep r28=-1,r28,61,3 // make address virtual
394(isBP) movl r2=ia64_boot_param
395 ;;
396(isBP) st8 [r2]=r28 // save the address of the boot param area passed by the bootloader
397
398#ifdef CONFIG_PARAVIRT
399
400 movl r14=hypervisor_setup_hooks
401 movl r15=hypervisor_type
402 mov r16=num_hypervisor_hooks
403 ;;
404 ld8 r2=[r15]
405 ;;
406 cmp.ltu p7,p0=r2,r16 // array size check
407 shladd r8=r2,3,r14
408 ;;
409(p7) ld8 r9=[r8]
410 ;;
411(p7) mov b1=r9
412(p7) cmp.ne.unc p7,p0=r9,r0 // no actual branch to NULL
413 ;;
414(p7) br.call.sptk.many rp=b1
415
416 __INITDATA
417
418default_setup_hook = 0 // Currently nothing needs to be done.
419
420 .weak xen_setup_hook
421
422 .global hypervisor_type
423hypervisor_type:
424 data8 PARAVIRT_HYPERVISOR_TYPE_DEFAULT
425
426 // must have the same order with PARAVIRT_HYPERVISOR_TYPE_xxx
427
428hypervisor_setup_hooks:
429 data8 default_setup_hook
430 data8 xen_setup_hook
431num_hypervisor_hooks = (. - hypervisor_setup_hooks) / 8
432 .previous
433
434#endif
435
436#ifdef CONFIG_SMP
437(isAP) br.call.sptk.many rp=start_secondary
438.ret0:
439(isAP) br.cond.sptk self
440#endif
441
442 // This is executed by the bootstrap processor (bsp) only:
443
444#ifdef CONFIG_IA64_FW_EMU
445 // initialize PAL & SAL emulator:
446 br.call.sptk.many rp=sys_fw_init
447.ret1:
448#endif
449 br.call.sptk.many rp=start_kernel
450.ret2: addl r3=@ltoff(halt_msg),gp
451 ;;
452 alloc r2=ar.pfs,8,0,2,0
453 ;;
454 ld8 out0=[r3]
455 br.call.sptk.many b0=console_print
456
457self: hint @pause
458 br.sptk.many self // endless loop
459END(_start)
460
461 .text
462
463GLOBAL_ENTRY(ia64_save_debug_regs)
464 alloc r16=ar.pfs,1,0,0,0
465 mov r20=ar.lc // preserve ar.lc
466 mov ar.lc=IA64_NUM_DBG_REGS-1
467 mov r18=0
468 add r19=IA64_NUM_DBG_REGS*8,in0
469 ;;
4701: mov r16=dbr[r18]
471#ifdef CONFIG_ITANIUM
472 ;;
473 srlz.d
474#endif
475 mov r17=ibr[r18]
476 add r18=1,r18
477 ;;
478 st8.nta [in0]=r16,8
479 st8.nta [r19]=r17,8
480 br.cloop.sptk.many 1b
481 ;;
482 mov ar.lc=r20 // restore ar.lc
483 br.ret.sptk.many rp
484END(ia64_save_debug_regs)
485
486GLOBAL_ENTRY(ia64_load_debug_regs)
487 alloc r16=ar.pfs,1,0,0,0
488 lfetch.nta [in0]
489 mov r20=ar.lc // preserve ar.lc
490 add r19=IA64_NUM_DBG_REGS*8,in0
491 mov ar.lc=IA64_NUM_DBG_REGS-1
492 mov r18=-1
493 ;;
4941: ld8.nta r16=[in0],8
495 ld8.nta r17=[r19],8
496 add r18=1,r18
497 ;;
498 mov dbr[r18]=r16
499#ifdef CONFIG_ITANIUM
500 ;;
501 srlz.d // Errata 132 (NoFix status)
502#endif
503 mov ibr[r18]=r17
504 br.cloop.sptk.many 1b
505 ;;
506 mov ar.lc=r20 // restore ar.lc
507 br.ret.sptk.many rp
508END(ia64_load_debug_regs)
509
510GLOBAL_ENTRY(__ia64_save_fpu)
511 alloc r2=ar.pfs,1,4,0,0
512 adds loc0=96*16-16,in0
513 adds loc1=96*16-16-128,in0
514 ;;
515 stf.spill.nta [loc0]=f127,-256
516 stf.spill.nta [loc1]=f119,-256
517 ;;
518 stf.spill.nta [loc0]=f111,-256
519 stf.spill.nta [loc1]=f103,-256
520 ;;
521 stf.spill.nta [loc0]=f95,-256
522 stf.spill.nta [loc1]=f87,-256
523 ;;
524 stf.spill.nta [loc0]=f79,-256
525 stf.spill.nta [loc1]=f71,-256
526 ;;
527 stf.spill.nta [loc0]=f63,-256
528 stf.spill.nta [loc1]=f55,-256
529 adds loc2=96*16-32,in0
530 ;;
531 stf.spill.nta [loc0]=f47,-256
532 stf.spill.nta [loc1]=f39,-256
533 adds loc3=96*16-32-128,in0
534 ;;
535 stf.spill.nta [loc2]=f126,-256
536 stf.spill.nta [loc3]=f118,-256
537 ;;
538 stf.spill.nta [loc2]=f110,-256
539 stf.spill.nta [loc3]=f102,-256
540 ;;
541 stf.spill.nta [loc2]=f94,-256
542 stf.spill.nta [loc3]=f86,-256
543 ;;
544 stf.spill.nta [loc2]=f78,-256
545 stf.spill.nta [loc3]=f70,-256
546 ;;
547 stf.spill.nta [loc2]=f62,-256
548 stf.spill.nta [loc3]=f54,-256
549 adds loc0=96*16-48,in0
550 ;;
551 stf.spill.nta [loc2]=f46,-256
552 stf.spill.nta [loc3]=f38,-256
553 adds loc1=96*16-48-128,in0
554 ;;
555 stf.spill.nta [loc0]=f125,-256
556 stf.spill.nta [loc1]=f117,-256
557 ;;
558 stf.spill.nta [loc0]=f109,-256
559 stf.spill.nta [loc1]=f101,-256
560 ;;
561 stf.spill.nta [loc0]=f93,-256
562 stf.spill.nta [loc1]=f85,-256
563 ;;
564 stf.spill.nta [loc0]=f77,-256
565 stf.spill.nta [loc1]=f69,-256
566 ;;
567 stf.spill.nta [loc0]=f61,-256
568 stf.spill.nta [loc1]=f53,-256
569 adds loc2=96*16-64,in0
570 ;;
571 stf.spill.nta [loc0]=f45,-256
572 stf.spill.nta [loc1]=f37,-256
573 adds loc3=96*16-64-128,in0
574 ;;
575 stf.spill.nta [loc2]=f124,-256
576 stf.spill.nta [loc3]=f116,-256
577 ;;
578 stf.spill.nta [loc2]=f108,-256
579 stf.spill.nta [loc3]=f100,-256
580 ;;
581 stf.spill.nta [loc2]=f92,-256
582 stf.spill.nta [loc3]=f84,-256
583 ;;
584 stf.spill.nta [loc2]=f76,-256
585 stf.spill.nta [loc3]=f68,-256
586 ;;
587 stf.spill.nta [loc2]=f60,-256
588 stf.spill.nta [loc3]=f52,-256
589 adds loc0=96*16-80,in0
590 ;;
591 stf.spill.nta [loc2]=f44,-256
592 stf.spill.nta [loc3]=f36,-256
593 adds loc1=96*16-80-128,in0
594 ;;
595 stf.spill.nta [loc0]=f123,-256
596 stf.spill.nta [loc1]=f115,-256
597 ;;
598 stf.spill.nta [loc0]=f107,-256
599 stf.spill.nta [loc1]=f99,-256
600 ;;
601 stf.spill.nta [loc0]=f91,-256
602 stf.spill.nta [loc1]=f83,-256
603 ;;
604 stf.spill.nta [loc0]=f75,-256
605 stf.spill.nta [loc1]=f67,-256
606 ;;
607 stf.spill.nta [loc0]=f59,-256
608 stf.spill.nta [loc1]=f51,-256
609 adds loc2=96*16-96,in0
610 ;;
611 stf.spill.nta [loc0]=f43,-256
612 stf.spill.nta [loc1]=f35,-256
613 adds loc3=96*16-96-128,in0
614 ;;
615 stf.spill.nta [loc2]=f122,-256
616 stf.spill.nta [loc3]=f114,-256
617 ;;
618 stf.spill.nta [loc2]=f106,-256
619 stf.spill.nta [loc3]=f98,-256
620 ;;
621 stf.spill.nta [loc2]=f90,-256
622 stf.spill.nta [loc3]=f82,-256
623 ;;
624 stf.spill.nta [loc2]=f74,-256
625 stf.spill.nta [loc3]=f66,-256
626 ;;
627 stf.spill.nta [loc2]=f58,-256
628 stf.spill.nta [loc3]=f50,-256
629 adds loc0=96*16-112,in0
630 ;;
631 stf.spill.nta [loc2]=f42,-256
632 stf.spill.nta [loc3]=f34,-256
633 adds loc1=96*16-112-128,in0
634 ;;
635 stf.spill.nta [loc0]=f121,-256
636 stf.spill.nta [loc1]=f113,-256
637 ;;
638 stf.spill.nta [loc0]=f105,-256
639 stf.spill.nta [loc1]=f97,-256
640 ;;
641 stf.spill.nta [loc0]=f89,-256
642 stf.spill.nta [loc1]=f81,-256
643 ;;
644 stf.spill.nta [loc0]=f73,-256
645 stf.spill.nta [loc1]=f65,-256
646 ;;
647 stf.spill.nta [loc0]=f57,-256
648 stf.spill.nta [loc1]=f49,-256
649 adds loc2=96*16-128,in0
650 ;;
651 stf.spill.nta [loc0]=f41,-256
652 stf.spill.nta [loc1]=f33,-256
653 adds loc3=96*16-128-128,in0
654 ;;
655 stf.spill.nta [loc2]=f120,-256
656 stf.spill.nta [loc3]=f112,-256
657 ;;
658 stf.spill.nta [loc2]=f104,-256
659 stf.spill.nta [loc3]=f96,-256
660 ;;
661 stf.spill.nta [loc2]=f88,-256
662 stf.spill.nta [loc3]=f80,-256
663 ;;
664 stf.spill.nta [loc2]=f72,-256
665 stf.spill.nta [loc3]=f64,-256
666 ;;
667 stf.spill.nta [loc2]=f56,-256
668 stf.spill.nta [loc3]=f48,-256
669 ;;
670 stf.spill.nta [loc2]=f40
671 stf.spill.nta [loc3]=f32
672 br.ret.sptk.many rp
673END(__ia64_save_fpu)
674
675GLOBAL_ENTRY(__ia64_load_fpu)
676 alloc r2=ar.pfs,1,2,0,0
677 adds r3=128,in0
678 adds r14=256,in0
679 adds r15=384,in0
680 mov loc0=512
681 mov loc1=-1024+16
682 ;;
683 ldf.fill.nta f32=[in0],loc0
684 ldf.fill.nta f40=[ r3],loc0
685 ldf.fill.nta f48=[r14],loc0
686 ldf.fill.nta f56=[r15],loc0
687 ;;
688 ldf.fill.nta f64=[in0],loc0
689 ldf.fill.nta f72=[ r3],loc0
690 ldf.fill.nta f80=[r14],loc0
691 ldf.fill.nta f88=[r15],loc0
692 ;;
693 ldf.fill.nta f96=[in0],loc1
694 ldf.fill.nta f104=[ r3],loc1
695 ldf.fill.nta f112=[r14],loc1
696 ldf.fill.nta f120=[r15],loc1
697 ;;
698 ldf.fill.nta f33=[in0],loc0
699 ldf.fill.nta f41=[ r3],loc0
700 ldf.fill.nta f49=[r14],loc0
701 ldf.fill.nta f57=[r15],loc0
702 ;;
703 ldf.fill.nta f65=[in0],loc0
704 ldf.fill.nta f73=[ r3],loc0
705 ldf.fill.nta f81=[r14],loc0
706 ldf.fill.nta f89=[r15],loc0
707 ;;
708 ldf.fill.nta f97=[in0],loc1
709 ldf.fill.nta f105=[ r3],loc1
710 ldf.fill.nta f113=[r14],loc1
711 ldf.fill.nta f121=[r15],loc1
712 ;;
713 ldf.fill.nta f34=[in0],loc0
714 ldf.fill.nta f42=[ r3],loc0
715 ldf.fill.nta f50=[r14],loc0
716 ldf.fill.nta f58=[r15],loc0
717 ;;
718 ldf.fill.nta f66=[in0],loc0
719 ldf.fill.nta f74=[ r3],loc0
720 ldf.fill.nta f82=[r14],loc0
721 ldf.fill.nta f90=[r15],loc0
722 ;;
723 ldf.fill.nta f98=[in0],loc1
724 ldf.fill.nta f106=[ r3],loc1
725 ldf.fill.nta f114=[r14],loc1
726 ldf.fill.nta f122=[r15],loc1
727 ;;
728 ldf.fill.nta f35=[in0],loc0
729 ldf.fill.nta f43=[ r3],loc0
730 ldf.fill.nta f51=[r14],loc0
731 ldf.fill.nta f59=[r15],loc0
732 ;;
733 ldf.fill.nta f67=[in0],loc0
734 ldf.fill.nta f75=[ r3],loc0
735 ldf.fill.nta f83=[r14],loc0
736 ldf.fill.nta f91=[r15],loc0
737 ;;
738 ldf.fill.nta f99=[in0],loc1
739 ldf.fill.nta f107=[ r3],loc1
740 ldf.fill.nta f115=[r14],loc1
741 ldf.fill.nta f123=[r15],loc1
742 ;;
743 ldf.fill.nta f36=[in0],loc0
744 ldf.fill.nta f44=[ r3],loc0
745 ldf.fill.nta f52=[r14],loc0
746 ldf.fill.nta f60=[r15],loc0
747 ;;
748 ldf.fill.nta f68=[in0],loc0
749 ldf.fill.nta f76=[ r3],loc0
750 ldf.fill.nta f84=[r14],loc0
751 ldf.fill.nta f92=[r15],loc0
752 ;;
753 ldf.fill.nta f100=[in0],loc1
754 ldf.fill.nta f108=[ r3],loc1
755 ldf.fill.nta f116=[r14],loc1
756 ldf.fill.nta f124=[r15],loc1
757 ;;
758 ldf.fill.nta f37=[in0],loc0
759 ldf.fill.nta f45=[ r3],loc0
760 ldf.fill.nta f53=[r14],loc0
761 ldf.fill.nta f61=[r15],loc0
762 ;;
763 ldf.fill.nta f69=[in0],loc0
764 ldf.fill.nta f77=[ r3],loc0
765 ldf.fill.nta f85=[r14],loc0
766 ldf.fill.nta f93=[r15],loc0
767 ;;
768 ldf.fill.nta f101=[in0],loc1
769 ldf.fill.nta f109=[ r3],loc1
770 ldf.fill.nta f117=[r14],loc1
771 ldf.fill.nta f125=[r15],loc1
772 ;;
773 ldf.fill.nta f38 =[in0],loc0
774 ldf.fill.nta f46 =[ r3],loc0
775 ldf.fill.nta f54 =[r14],loc0
776 ldf.fill.nta f62 =[r15],loc0
777 ;;
778 ldf.fill.nta f70 =[in0],loc0
779 ldf.fill.nta f78 =[ r3],loc0
780 ldf.fill.nta f86 =[r14],loc0
781 ldf.fill.nta f94 =[r15],loc0
782 ;;
783 ldf.fill.nta f102=[in0],loc1
784 ldf.fill.nta f110=[ r3],loc1
785 ldf.fill.nta f118=[r14],loc1
786 ldf.fill.nta f126=[r15],loc1
787 ;;
788 ldf.fill.nta f39 =[in0],loc0
789 ldf.fill.nta f47 =[ r3],loc0
790 ldf.fill.nta f55 =[r14],loc0
791 ldf.fill.nta f63 =[r15],loc0
792 ;;
793 ldf.fill.nta f71 =[in0],loc0
794 ldf.fill.nta f79 =[ r3],loc0
795 ldf.fill.nta f87 =[r14],loc0
796 ldf.fill.nta f95 =[r15],loc0
797 ;;
798 ldf.fill.nta f103=[in0]
799 ldf.fill.nta f111=[ r3]
800 ldf.fill.nta f119=[r14]
801 ldf.fill.nta f127=[r15]
802 br.ret.sptk.many rp
803END(__ia64_load_fpu)
804
805GLOBAL_ENTRY(__ia64_init_fpu)
806 stf.spill [sp]=f0 // M3
807 mov f32=f0 // F
808 nop.b 0
809
810 ldfps f33,f34=[sp] // M0
811 ldfps f35,f36=[sp] // M1
812 mov f37=f0 // F
813 ;;
814
815 setf.s f38=r0 // M2
816 setf.s f39=r0 // M3
817 mov f40=f0 // F
818
819 ldfps f41,f42=[sp] // M0
820 ldfps f43,f44=[sp] // M1
821 mov f45=f0 // F
822
823 setf.s f46=r0 // M2
824 setf.s f47=r0 // M3
825 mov f48=f0 // F
826
827 ldfps f49,f50=[sp] // M0
828 ldfps f51,f52=[sp] // M1
829 mov f53=f0 // F
830
831 setf.s f54=r0 // M2
832 setf.s f55=r0 // M3
833 mov f56=f0 // F
834
835 ldfps f57,f58=[sp] // M0
836 ldfps f59,f60=[sp] // M1
837 mov f61=f0 // F
838
839 setf.s f62=r0 // M2
840 setf.s f63=r0 // M3
841 mov f64=f0 // F
842
843 ldfps f65,f66=[sp] // M0
844 ldfps f67,f68=[sp] // M1
845 mov f69=f0 // F
846
847 setf.s f70=r0 // M2
848 setf.s f71=r0 // M3
849 mov f72=f0 // F
850
851 ldfps f73,f74=[sp] // M0
852 ldfps f75,f76=[sp] // M1
853 mov f77=f0 // F
854
855 setf.s f78=r0 // M2
856 setf.s f79=r0 // M3
857 mov f80=f0 // F
858
859 ldfps f81,f82=[sp] // M0
860 ldfps f83,f84=[sp] // M1
861 mov f85=f0 // F
862
863 setf.s f86=r0 // M2
864 setf.s f87=r0 // M3
865 mov f88=f0 // F
866
867 /*
868 * When the instructions are cached, it would be faster to initialize
869 * the remaining registers with simply mov instructions (F-unit).
870 * This gets the time down to ~29 cycles. However, this would use up
871 * 33 bundles, whereas continuing with the above pattern yields
872 * 10 bundles and ~30 cycles.
873 */
874
875 ldfps f89,f90=[sp] // M0
876 ldfps f91,f92=[sp] // M1
877 mov f93=f0 // F
878
879 setf.s f94=r0 // M2
880 setf.s f95=r0 // M3
881 mov f96=f0 // F
882
883 ldfps f97,f98=[sp] // M0
884 ldfps f99,f100=[sp] // M1
885 mov f101=f0 // F
886
887 setf.s f102=r0 // M2
888 setf.s f103=r0 // M3
889 mov f104=f0 // F
890
891 ldfps f105,f106=[sp] // M0
892 ldfps f107,f108=[sp] // M1
893 mov f109=f0 // F
894
895 setf.s f110=r0 // M2
896 setf.s f111=r0 // M3
897 mov f112=f0 // F
898
899 ldfps f113,f114=[sp] // M0
900 ldfps f115,f116=[sp] // M1
901 mov f117=f0 // F
902
903 setf.s f118=r0 // M2
904 setf.s f119=r0 // M3
905 mov f120=f0 // F
906
907 ldfps f121,f122=[sp] // M0
908 ldfps f123,f124=[sp] // M1
909 mov f125=f0 // F
910
911 setf.s f126=r0 // M2
912 setf.s f127=r0 // M3
913 br.ret.sptk.many rp // F
914END(__ia64_init_fpu)
915
916/*
917 * Switch execution mode from virtual to physical
918 *
919 * Inputs:
920 * r16 = new psr to establish
921 * Output:
922 * r19 = old virtual address of ar.bsp
923 * r20 = old virtual address of sp
924 *
925 * Note: RSE must already be in enforced lazy mode
926 */
927GLOBAL_ENTRY(ia64_switch_mode_phys)
928 {
929 rsm psr.i | psr.ic // disable interrupts and interrupt collection
930 mov r15=ip
931 }
932 ;;
933 {
934 flushrs // must be first insn in group
935 srlz.i
936 }
937 ;;
938 mov cr.ipsr=r16 // set new PSR
939 add r3=1f-ia64_switch_mode_phys,r15
940
941 mov r19=ar.bsp
942 mov r20=sp
943 mov r14=rp // get return address into a general register
944 ;;
945
946 // going to physical mode, use tpa to translate virt->phys
947 tpa r17=r19
948 tpa r3=r3
949 tpa sp=sp
950 tpa r14=r14
951 ;;
952
953 mov r18=ar.rnat // save ar.rnat
954 mov ar.bspstore=r17 // this steps on ar.rnat
955 mov cr.iip=r3
956 mov cr.ifs=r0
957 ;;
958 mov ar.rnat=r18 // restore ar.rnat
959 rfi // must be last insn in group
960 ;;
9611: mov rp=r14
962 br.ret.sptk.many rp
963END(ia64_switch_mode_phys)
964
965/*
966 * Switch execution mode from physical to virtual
967 *
968 * Inputs:
969 * r16 = new psr to establish
970 * r19 = new bspstore to establish
971 * r20 = new sp to establish
972 *
973 * Note: RSE must already be in enforced lazy mode
974 */
975GLOBAL_ENTRY(ia64_switch_mode_virt)
976 {
977 rsm psr.i | psr.ic // disable interrupts and interrupt collection
978 mov r15=ip
979 }
980 ;;
981 {
982 flushrs // must be first insn in group
983 srlz.i
984 }
985 ;;
986 mov cr.ipsr=r16 // set new PSR
987 add r3=1f-ia64_switch_mode_virt,r15
988
989 mov r14=rp // get return address into a general register
990 ;;
991
992 // going to virtual
993 // - for code addresses, set upper bits of addr to KERNEL_START
994 // - for stack addresses, copy from input argument
995 movl r18=KERNEL_START
996 dep r3=0,r3,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
997 dep r14=0,r14,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
998 mov sp=r20
999 ;;
1000 or r3=r3,r18
1001 or r14=r14,r18
1002 ;;
1003
1004 mov r18=ar.rnat // save ar.rnat
1005 mov ar.bspstore=r19 // this steps on ar.rnat
1006 mov cr.iip=r3
1007 mov cr.ifs=r0
1008 ;;
1009 mov ar.rnat=r18 // restore ar.rnat
1010 rfi // must be last insn in group
1011 ;;
10121: mov rp=r14
1013 br.ret.sptk.many rp
1014END(ia64_switch_mode_virt)
1015
1016GLOBAL_ENTRY(ia64_delay_loop)
1017 .prologue
1018{ nop 0 // work around GAS unwind info generation bug...
1019 .save ar.lc,r2
1020 mov r2=ar.lc
1021 .body
1022 ;;
1023 mov ar.lc=r32
1024}
1025 ;;
1026 // force loop to be 32-byte aligned (GAS bug means we cannot use .align
1027 // inside function body without corrupting unwind info).
1028{ nop 0 }
10291: br.cloop.sptk.few 1b
1030 ;;
1031 mov ar.lc=r2
1032 br.ret.sptk.many rp
1033END(ia64_delay_loop)
1034
1035/*
1036 * Return a CPU-local timestamp in nano-seconds. This timestamp is
1037 * NOT synchronized across CPUs its return value must never be
1038 * compared against the values returned on another CPU. The usage in
1039 * kernel/sched.c ensures that.
1040 *
1041 * The return-value of sched_clock() is NOT supposed to wrap-around.
1042 * If it did, it would cause some scheduling hiccups (at the worst).
1043 * Fortunately, with a 64-bit cycle-counter ticking at 100GHz, even
1044 * that would happen only once every 5+ years.
1045 *
1046 * The code below basically calculates:
1047 *
1048 * (ia64_get_itc() * local_cpu_data->nsec_per_cyc) >> IA64_NSEC_PER_CYC_SHIFT
1049 *
1050 * except that the multiplication and the shift are done with 128-bit
1051 * intermediate precision so that we can produce a full 64-bit result.
1052 */
1053GLOBAL_ENTRY(ia64_native_sched_clock)
1054 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1055 mov.m r9=ar.itc // fetch cycle-counter (35 cyc)
1056 ;;
1057 ldf8 f8=[r8]
1058 ;;
1059 setf.sig f9=r9 // certain to stall, so issue it _after_ ldf8...
1060 ;;
1061 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1062 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1063 ;;
1064 getf.sig r8=f10 // (5 cyc)
1065 getf.sig r9=f11
1066 ;;
1067 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1068 br.ret.sptk.many rp
1069END(ia64_native_sched_clock)
1070#ifndef CONFIG_PARAVIRT
1071 //unsigned long long
1072 //sched_clock(void) __attribute__((alias("ia64_native_sched_clock")));
1073 .global sched_clock
1074sched_clock = ia64_native_sched_clock
1075#endif
1076
1077#ifdef CONFIG_VIRT_CPU_ACCOUNTING
1078GLOBAL_ENTRY(cycle_to_cputime)
1079 alloc r16=ar.pfs,1,0,0,0
1080 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1081 ;;
1082 ldf8 f8=[r8]
1083 ;;
1084 setf.sig f9=r32
1085 ;;
1086 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1087 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1088 ;;
1089 getf.sig r8=f10 // (5 cyc)
1090 getf.sig r9=f11
1091 ;;
1092 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1093 br.ret.sptk.many rp
1094END(cycle_to_cputime)
1095#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
1096
1097GLOBAL_ENTRY(start_kernel_thread)
1098 .prologue
1099 .save rp, r0 // this is the end of the call-chain
1100 .body
1101 alloc r2 = ar.pfs, 0, 0, 2, 0
1102 mov out0 = r9
1103 mov out1 = r11;;
1104 br.call.sptk.many rp = kernel_thread_helper;;
1105 mov out0 = r8
1106 br.call.sptk.many rp = sys_exit;;
11071: br.sptk.few 1b // not reached
1108END(start_kernel_thread)
1109
1110#ifdef CONFIG_IA64_BRL_EMU
1111
1112/*
1113 * Assembly routines used by brl_emu.c to set preserved register state.
1114 */
1115
1116#define SET_REG(reg) \
1117 GLOBAL_ENTRY(ia64_set_##reg); \
1118 alloc r16=ar.pfs,1,0,0,0; \
1119 mov reg=r32; \
1120 ;; \
1121 br.ret.sptk.many rp; \
1122 END(ia64_set_##reg)
1123
1124SET_REG(b1);
1125SET_REG(b2);
1126SET_REG(b3);
1127SET_REG(b4);
1128SET_REG(b5);
1129
1130#endif /* CONFIG_IA64_BRL_EMU */
1131
1132#ifdef CONFIG_SMP
1133
1134#ifdef CONFIG_HOTPLUG_CPU
1135GLOBAL_ENTRY(ia64_jump_to_sal)
1136 alloc r16=ar.pfs,1,0,0,0;;
1137 rsm psr.i | psr.ic
1138{
1139 flushrs
1140 srlz.i
1141}
1142 tpa r25=in0
1143 movl r18=tlb_purge_done;;
1144 DATA_VA_TO_PA(r18);;
1145 mov b1=r18 // Return location
1146 movl r18=ia64_do_tlb_purge;;
1147 DATA_VA_TO_PA(r18);;
1148 mov b2=r18 // doing tlb_flush work
1149 mov ar.rsc=0 // Put RSE in enforced lazy, LE mode
1150 movl r17=1f;;
1151 DATA_VA_TO_PA(r17);;
1152 mov cr.iip=r17
1153 movl r16=SAL_PSR_BITS_TO_SET;;
1154 mov cr.ipsr=r16
1155 mov cr.ifs=r0;;
1156 rfi;; // note: this unmask MCA/INIT (psr.mc)
11571:
1158 /*
1159 * Invalidate all TLB data/inst
1160 */
1161 br.sptk.many b2;; // jump to tlb purge code
1162
1163tlb_purge_done:
1164 RESTORE_REGION_REGS(r25, r17,r18,r19);;
1165 RESTORE_REG(b0, r25, r17);;
1166 RESTORE_REG(b1, r25, r17);;
1167 RESTORE_REG(b2, r25, r17);;
1168 RESTORE_REG(b3, r25, r17);;
1169 RESTORE_REG(b4, r25, r17);;
1170 RESTORE_REG(b5, r25, r17);;
1171 ld8 r1=[r25],0x08;;
1172 ld8 r12=[r25],0x08;;
1173 ld8 r13=[r25],0x08;;
1174 RESTORE_REG(ar.fpsr, r25, r17);;
1175 RESTORE_REG(ar.pfs, r25, r17);;
1176 RESTORE_REG(ar.rnat, r25, r17);;
1177 RESTORE_REG(ar.unat, r25, r17);;
1178 RESTORE_REG(ar.bspstore, r25, r17);;
1179 RESTORE_REG(cr.dcr, r25, r17);;
1180 RESTORE_REG(cr.iva, r25, r17);;
1181 RESTORE_REG(cr.pta, r25, r17);;
1182 srlz.d;; // required not to violate RAW dependency
1183 RESTORE_REG(cr.itv, r25, r17);;
1184 RESTORE_REG(cr.pmv, r25, r17);;
1185 RESTORE_REG(cr.cmcv, r25, r17);;
1186 RESTORE_REG(cr.lrr0, r25, r17);;
1187 RESTORE_REG(cr.lrr1, r25, r17);;
1188 ld8 r4=[r25],0x08;;
1189 ld8 r5=[r25],0x08;;
1190 ld8 r6=[r25],0x08;;
1191 ld8 r7=[r25],0x08;;
1192 ld8 r17=[r25],0x08;;
1193 mov pr=r17,-1;;
1194 RESTORE_REG(ar.lc, r25, r17);;
1195 /*
1196 * Now Restore floating point regs
1197 */
1198 ldf.fill.nta f2=[r25],16;;
1199 ldf.fill.nta f3=[r25],16;;
1200 ldf.fill.nta f4=[r25],16;;
1201 ldf.fill.nta f5=[r25],16;;
1202 ldf.fill.nta f16=[r25],16;;
1203 ldf.fill.nta f17=[r25],16;;
1204 ldf.fill.nta f18=[r25],16;;
1205 ldf.fill.nta f19=[r25],16;;
1206 ldf.fill.nta f20=[r25],16;;
1207 ldf.fill.nta f21=[r25],16;;
1208 ldf.fill.nta f22=[r25],16;;
1209 ldf.fill.nta f23=[r25],16;;
1210 ldf.fill.nta f24=[r25],16;;
1211 ldf.fill.nta f25=[r25],16;;
1212 ldf.fill.nta f26=[r25],16;;
1213 ldf.fill.nta f27=[r25],16;;
1214 ldf.fill.nta f28=[r25],16;;
1215 ldf.fill.nta f29=[r25],16;;
1216 ldf.fill.nta f30=[r25],16;;
1217 ldf.fill.nta f31=[r25],16;;
1218
1219 /*
1220 * Now that we have done all the register restores
1221 * we are now ready for the big DIVE to SAL Land
1222 */
1223 ssm psr.ic;;
1224 srlz.d;;
1225 br.ret.sptk.many b0;;
1226END(ia64_jump_to_sal)
1227#endif /* CONFIG_HOTPLUG_CPU */
1228
1229#endif /* CONFIG_SMP */
1/*
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
6 * entry point.
7 *
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
20 */
21
22
23#include <asm/asmmacro.h>
24#include <asm/fpu.h>
25#include <asm/kregs.h>
26#include <asm/mmu_context.h>
27#include <asm/asm-offsets.h>
28#include <asm/pal.h>
29#include <asm/pgtable.h>
30#include <asm/processor.h>
31#include <asm/ptrace.h>
32#include <asm/mca_asm.h>
33#include <linux/init.h>
34#include <linux/linkage.h>
35
36#ifdef CONFIG_HOTPLUG_CPU
37#define SAL_PSR_BITS_TO_SET \
38 (IA64_PSR_AC | IA64_PSR_BN | IA64_PSR_MFH | IA64_PSR_MFL)
39
40#define SAVE_FROM_REG(src, ptr, dest) \
41 mov dest=src;; \
42 st8 [ptr]=dest,0x08
43
44#define RESTORE_REG(reg, ptr, _tmp) \
45 ld8 _tmp=[ptr],0x08;; \
46 mov reg=_tmp
47
48#define SAVE_BREAK_REGS(ptr, _idx, _breg, _dest)\
49 mov ar.lc=IA64_NUM_DBG_REGS-1;; \
50 mov _idx=0;; \
511: \
52 SAVE_FROM_REG(_breg[_idx], ptr, _dest);; \
53 add _idx=1,_idx;; \
54 br.cloop.sptk.many 1b
55
56#define RESTORE_BREAK_REGS(ptr, _idx, _breg, _tmp, _lbl)\
57 mov ar.lc=IA64_NUM_DBG_REGS-1;; \
58 mov _idx=0;; \
59_lbl: RESTORE_REG(_breg[_idx], ptr, _tmp);; \
60 add _idx=1, _idx;; \
61 br.cloop.sptk.many _lbl
62
63#define SAVE_ONE_RR(num, _reg, _tmp) \
64 movl _tmp=(num<<61);; \
65 mov _reg=rr[_tmp]
66
67#define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
68 SAVE_ONE_RR(0,_r0, _tmp);; \
69 SAVE_ONE_RR(1,_r1, _tmp);; \
70 SAVE_ONE_RR(2,_r2, _tmp);; \
71 SAVE_ONE_RR(3,_r3, _tmp);; \
72 SAVE_ONE_RR(4,_r4, _tmp);; \
73 SAVE_ONE_RR(5,_r5, _tmp);; \
74 SAVE_ONE_RR(6,_r6, _tmp);; \
75 SAVE_ONE_RR(7,_r7, _tmp);;
76
77#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
78 st8 [ptr]=_r0, 8;; \
79 st8 [ptr]=_r1, 8;; \
80 st8 [ptr]=_r2, 8;; \
81 st8 [ptr]=_r3, 8;; \
82 st8 [ptr]=_r4, 8;; \
83 st8 [ptr]=_r5, 8;; \
84 st8 [ptr]=_r6, 8;; \
85 st8 [ptr]=_r7, 8;;
86
87#define RESTORE_REGION_REGS(ptr, _idx1, _idx2, _tmp) \
88 mov ar.lc=0x08-1;; \
89 movl _idx1=0x00;; \
90RestRR: \
91 dep.z _idx2=_idx1,61,3;; \
92 ld8 _tmp=[ptr],8;; \
93 mov rr[_idx2]=_tmp;; \
94 srlz.d;; \
95 add _idx1=1,_idx1;; \
96 br.cloop.sptk.few RestRR
97
98#define SET_AREA_FOR_BOOTING_CPU(reg1, reg2) \
99 movl reg1=sal_state_for_booting_cpu;; \
100 ld8 reg2=[reg1];;
101
102/*
103 * Adjust region registers saved before starting to save
104 * break regs and rest of the states that need to be preserved.
105 */
106#define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(_reg1,_reg2,_pred) \
107 SAVE_FROM_REG(b0,_reg1,_reg2);; \
108 SAVE_FROM_REG(b1,_reg1,_reg2);; \
109 SAVE_FROM_REG(b2,_reg1,_reg2);; \
110 SAVE_FROM_REG(b3,_reg1,_reg2);; \
111 SAVE_FROM_REG(b4,_reg1,_reg2);; \
112 SAVE_FROM_REG(b5,_reg1,_reg2);; \
113 st8 [_reg1]=r1,0x08;; \
114 st8 [_reg1]=r12,0x08;; \
115 st8 [_reg1]=r13,0x08;; \
116 SAVE_FROM_REG(ar.fpsr,_reg1,_reg2);; \
117 SAVE_FROM_REG(ar.pfs,_reg1,_reg2);; \
118 SAVE_FROM_REG(ar.rnat,_reg1,_reg2);; \
119 SAVE_FROM_REG(ar.unat,_reg1,_reg2);; \
120 SAVE_FROM_REG(ar.bspstore,_reg1,_reg2);; \
121 SAVE_FROM_REG(cr.dcr,_reg1,_reg2);; \
122 SAVE_FROM_REG(cr.iva,_reg1,_reg2);; \
123 SAVE_FROM_REG(cr.pta,_reg1,_reg2);; \
124 SAVE_FROM_REG(cr.itv,_reg1,_reg2);; \
125 SAVE_FROM_REG(cr.pmv,_reg1,_reg2);; \
126 SAVE_FROM_REG(cr.cmcv,_reg1,_reg2);; \
127 SAVE_FROM_REG(cr.lrr0,_reg1,_reg2);; \
128 SAVE_FROM_REG(cr.lrr1,_reg1,_reg2);; \
129 st8 [_reg1]=r4,0x08;; \
130 st8 [_reg1]=r5,0x08;; \
131 st8 [_reg1]=r6,0x08;; \
132 st8 [_reg1]=r7,0x08;; \
133 st8 [_reg1]=_pred,0x08;; \
134 SAVE_FROM_REG(ar.lc, _reg1, _reg2);; \
135 stf.spill.nta [_reg1]=f2,16;; \
136 stf.spill.nta [_reg1]=f3,16;; \
137 stf.spill.nta [_reg1]=f4,16;; \
138 stf.spill.nta [_reg1]=f5,16;; \
139 stf.spill.nta [_reg1]=f16,16;; \
140 stf.spill.nta [_reg1]=f17,16;; \
141 stf.spill.nta [_reg1]=f18,16;; \
142 stf.spill.nta [_reg1]=f19,16;; \
143 stf.spill.nta [_reg1]=f20,16;; \
144 stf.spill.nta [_reg1]=f21,16;; \
145 stf.spill.nta [_reg1]=f22,16;; \
146 stf.spill.nta [_reg1]=f23,16;; \
147 stf.spill.nta [_reg1]=f24,16;; \
148 stf.spill.nta [_reg1]=f25,16;; \
149 stf.spill.nta [_reg1]=f26,16;; \
150 stf.spill.nta [_reg1]=f27,16;; \
151 stf.spill.nta [_reg1]=f28,16;; \
152 stf.spill.nta [_reg1]=f29,16;; \
153 stf.spill.nta [_reg1]=f30,16;; \
154 stf.spill.nta [_reg1]=f31,16;;
155
156#else
157#define SET_AREA_FOR_BOOTING_CPU(a1, a2)
158#define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(a1,a2, a3)
159#define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
160#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
161#endif
162
163#define SET_ONE_RR(num, pgsize, _tmp1, _tmp2, vhpt) \
164 movl _tmp1=(num << 61);; \
165 mov _tmp2=((ia64_rid(IA64_REGION_ID_KERNEL, (num<<61)) << 8) | (pgsize << 2) | vhpt);; \
166 mov rr[_tmp1]=_tmp2
167
168 __PAGE_ALIGNED_DATA
169
170 .global empty_zero_page
171empty_zero_page:
172 .skip PAGE_SIZE
173
174 .global swapper_pg_dir
175swapper_pg_dir:
176 .skip PAGE_SIZE
177
178 .rodata
179halt_msg:
180 stringz "Halting kernel\n"
181
182 __REF
183
184 .global start_ap
185
186 /*
187 * Start the kernel. When the bootloader passes control to _start(), r28
188 * points to the address of the boot parameter area. Execution reaches
189 * here in physical mode.
190 */
191GLOBAL_ENTRY(_start)
192start_ap:
193 .prologue
194 .save rp, r0 // terminate unwind chain with a NULL rp
195 .body
196
197 rsm psr.i | psr.ic
198 ;;
199 srlz.i
200 ;;
201 {
202 flushrs // must be first insn in group
203 srlz.i
204 }
205 ;;
206 /*
207 * Save the region registers, predicate before they get clobbered
208 */
209 SAVE_REGION_REGS(r2, r8,r9,r10,r11,r12,r13,r14,r15);
210 mov r25=pr;;
211
212 /*
213 * Initialize kernel region registers:
214 * rr[0]: VHPT enabled, page size = PAGE_SHIFT
215 * rr[1]: VHPT enabled, page size = PAGE_SHIFT
216 * rr[2]: VHPT enabled, page size = PAGE_SHIFT
217 * rr[3]: VHPT enabled, page size = PAGE_SHIFT
218 * rr[4]: VHPT enabled, page size = PAGE_SHIFT
219 * rr[5]: VHPT enabled, page size = PAGE_SHIFT
220 * rr[6]: VHPT disabled, page size = IA64_GRANULE_SHIFT
221 * rr[7]: VHPT disabled, page size = IA64_GRANULE_SHIFT
222 * We initialize all of them to prevent inadvertently assuming
223 * something about the state of address translation early in boot.
224 */
225 SET_ONE_RR(0, PAGE_SHIFT, r2, r16, 1);;
226 SET_ONE_RR(1, PAGE_SHIFT, r2, r16, 1);;
227 SET_ONE_RR(2, PAGE_SHIFT, r2, r16, 1);;
228 SET_ONE_RR(3, PAGE_SHIFT, r2, r16, 1);;
229 SET_ONE_RR(4, PAGE_SHIFT, r2, r16, 1);;
230 SET_ONE_RR(5, PAGE_SHIFT, r2, r16, 1);;
231 SET_ONE_RR(6, IA64_GRANULE_SHIFT, r2, r16, 0);;
232 SET_ONE_RR(7, IA64_GRANULE_SHIFT, r2, r16, 0);;
233 /*
234 * Now pin mappings into the TLB for kernel text and data
235 */
236 mov r18=KERNEL_TR_PAGE_SHIFT<<2
237 movl r17=KERNEL_START
238 ;;
239 mov cr.itir=r18
240 mov cr.ifa=r17
241 mov r16=IA64_TR_KERNEL
242 mov r3=ip
243 movl r18=PAGE_KERNEL
244 ;;
245 dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT
246 ;;
247 or r18=r2,r18
248 ;;
249 srlz.i
250 ;;
251 itr.i itr[r16]=r18
252 ;;
253 itr.d dtr[r16]=r18
254 ;;
255 srlz.i
256
257 /*
258 * Switch into virtual mode:
259 */
260 movl r16=(IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN \
261 |IA64_PSR_DI)
262 ;;
263 mov cr.ipsr=r16
264 movl r17=1f
265 ;;
266 mov cr.iip=r17
267 mov cr.ifs=r0
268 ;;
269 rfi
270 ;;
2711: // now we are in virtual mode
272
273 SET_AREA_FOR_BOOTING_CPU(r2, r16);
274
275 STORE_REGION_REGS(r16, r8,r9,r10,r11,r12,r13,r14,r15);
276 SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(r16,r17,r25)
277 ;;
278
279 // set IVT entry point---can't access I/O ports without it
280 movl r3=ia64_ivt
281 ;;
282 mov cr.iva=r3
283 movl r2=FPSR_DEFAULT
284 ;;
285 srlz.i
286 movl gp=__gp
287
288 mov ar.fpsr=r2
289 ;;
290
291#define isAP p2 // are we an Application Processor?
292#define isBP p3 // are we the Bootstrap Processor?
293
294#ifdef CONFIG_SMP
295 /*
296 * Find the init_task for the currently booting CPU. At poweron, and in
297 * UP mode, task_for_booting_cpu is NULL.
298 */
299 movl r3=task_for_booting_cpu
300 ;;
301 ld8 r3=[r3]
302 movl r2=init_task
303 ;;
304 cmp.eq isBP,isAP=r3,r0
305 ;;
306(isAP) mov r2=r3
307#else
308 movl r2=init_task
309 cmp.eq isBP,isAP=r0,r0
310#endif
311 ;;
312 tpa r3=r2 // r3 == phys addr of task struct
313 mov r16=-1
314(isBP) br.cond.dpnt .load_current // BP stack is on region 5 --- no need to map it
315
316 // load mapping for stack (virtaddr in r2, physaddr in r3)
317 rsm psr.ic
318 movl r17=PAGE_KERNEL
319 ;;
320 srlz.d
321 dep r18=0,r3,0,12
322 ;;
323 or r18=r17,r18
324 dep r2=-1,r3,61,3 // IMVA of task
325 ;;
326 mov r17=rr[r2]
327 shr.u r16=r3,IA64_GRANULE_SHIFT
328 ;;
329 dep r17=0,r17,8,24
330 ;;
331 mov cr.itir=r17
332 mov cr.ifa=r2
333
334 mov r19=IA64_TR_CURRENT_STACK
335 ;;
336 itr.d dtr[r19]=r18
337 ;;
338 ssm psr.ic
339 srlz.d
340 ;;
341
342.load_current:
343 // load the "current" pointer (r13) and ar.k6 with the current task
344 mov IA64_KR(CURRENT)=r2 // virtual address
345 mov IA64_KR(CURRENT_STACK)=r16
346 mov r13=r2
347 /*
348 * Reserve space at the top of the stack for "struct pt_regs". Kernel
349 * threads don't store interesting values in that structure, but the space
350 * still needs to be there because time-critical stuff such as the context
351 * switching can be implemented more efficiently (for example, __switch_to()
352 * always sets the psr.dfh bit of the task it is switching to).
353 */
354
355 addl r12=IA64_STK_OFFSET-IA64_PT_REGS_SIZE-16,r2
356 addl r2=IA64_RBS_OFFSET,r2 // initialize the RSE
357 mov ar.rsc=0 // place RSE in enforced lazy mode
358 ;;
359 loadrs // clear the dirty partition
360 movl r19=__phys_per_cpu_start
361 mov r18=PERCPU_PAGE_SIZE
362 ;;
363#ifndef CONFIG_SMP
364 add r19=r19,r18
365 ;;
366#else
367(isAP) br.few 2f
368 movl r20=__cpu0_per_cpu
369 ;;
370 shr.u r18=r18,3
3711:
372 ld8 r21=[r19],8;;
373 st8[r20]=r21,8
374 adds r18=-1,r18;;
375 cmp4.lt p7,p6=0,r18
376(p7) br.cond.dptk.few 1b
377 mov r19=r20
378 ;;
3792:
380#endif
381 tpa r19=r19
382 ;;
383 .pred.rel.mutex isBP,isAP
384(isBP) mov IA64_KR(PER_CPU_DATA)=r19 // per-CPU base for cpu0
385(isAP) mov IA64_KR(PER_CPU_DATA)=r0 // clear physical per-CPU base
386 ;;
387 mov ar.bspstore=r2 // establish the new RSE stack
388 ;;
389 mov ar.rsc=0x3 // place RSE in eager mode
390
391(isBP) dep r28=-1,r28,61,3 // make address virtual
392(isBP) movl r2=ia64_boot_param
393 ;;
394(isBP) st8 [r2]=r28 // save the address of the boot param area passed by the bootloader
395
396#ifdef CONFIG_SMP
397(isAP) br.call.sptk.many rp=start_secondary
398.ret0:
399(isAP) br.cond.sptk self
400#endif
401
402 // This is executed by the bootstrap processor (bsp) only:
403
404#ifdef CONFIG_IA64_FW_EMU
405 // initialize PAL & SAL emulator:
406 br.call.sptk.many rp=sys_fw_init
407.ret1:
408#endif
409 br.call.sptk.many rp=start_kernel
410.ret2: addl r3=@ltoff(halt_msg),gp
411 ;;
412 alloc r2=ar.pfs,8,0,2,0
413 ;;
414 ld8 out0=[r3]
415 br.call.sptk.many b0=console_print
416
417self: hint @pause
418 br.sptk.many self // endless loop
419END(_start)
420
421 .text
422
423GLOBAL_ENTRY(ia64_save_debug_regs)
424 alloc r16=ar.pfs,1,0,0,0
425 mov r20=ar.lc // preserve ar.lc
426 mov ar.lc=IA64_NUM_DBG_REGS-1
427 mov r18=0
428 add r19=IA64_NUM_DBG_REGS*8,in0
429 ;;
4301: mov r16=dbr[r18]
431#ifdef CONFIG_ITANIUM
432 ;;
433 srlz.d
434#endif
435 mov r17=ibr[r18]
436 add r18=1,r18
437 ;;
438 st8.nta [in0]=r16,8
439 st8.nta [r19]=r17,8
440 br.cloop.sptk.many 1b
441 ;;
442 mov ar.lc=r20 // restore ar.lc
443 br.ret.sptk.many rp
444END(ia64_save_debug_regs)
445
446GLOBAL_ENTRY(ia64_load_debug_regs)
447 alloc r16=ar.pfs,1,0,0,0
448 lfetch.nta [in0]
449 mov r20=ar.lc // preserve ar.lc
450 add r19=IA64_NUM_DBG_REGS*8,in0
451 mov ar.lc=IA64_NUM_DBG_REGS-1
452 mov r18=-1
453 ;;
4541: ld8.nta r16=[in0],8
455 ld8.nta r17=[r19],8
456 add r18=1,r18
457 ;;
458 mov dbr[r18]=r16
459#ifdef CONFIG_ITANIUM
460 ;;
461 srlz.d // Errata 132 (NoFix status)
462#endif
463 mov ibr[r18]=r17
464 br.cloop.sptk.many 1b
465 ;;
466 mov ar.lc=r20 // restore ar.lc
467 br.ret.sptk.many rp
468END(ia64_load_debug_regs)
469
470GLOBAL_ENTRY(__ia64_save_fpu)
471 alloc r2=ar.pfs,1,4,0,0
472 adds loc0=96*16-16,in0
473 adds loc1=96*16-16-128,in0
474 ;;
475 stf.spill.nta [loc0]=f127,-256
476 stf.spill.nta [loc1]=f119,-256
477 ;;
478 stf.spill.nta [loc0]=f111,-256
479 stf.spill.nta [loc1]=f103,-256
480 ;;
481 stf.spill.nta [loc0]=f95,-256
482 stf.spill.nta [loc1]=f87,-256
483 ;;
484 stf.spill.nta [loc0]=f79,-256
485 stf.spill.nta [loc1]=f71,-256
486 ;;
487 stf.spill.nta [loc0]=f63,-256
488 stf.spill.nta [loc1]=f55,-256
489 adds loc2=96*16-32,in0
490 ;;
491 stf.spill.nta [loc0]=f47,-256
492 stf.spill.nta [loc1]=f39,-256
493 adds loc3=96*16-32-128,in0
494 ;;
495 stf.spill.nta [loc2]=f126,-256
496 stf.spill.nta [loc3]=f118,-256
497 ;;
498 stf.spill.nta [loc2]=f110,-256
499 stf.spill.nta [loc3]=f102,-256
500 ;;
501 stf.spill.nta [loc2]=f94,-256
502 stf.spill.nta [loc3]=f86,-256
503 ;;
504 stf.spill.nta [loc2]=f78,-256
505 stf.spill.nta [loc3]=f70,-256
506 ;;
507 stf.spill.nta [loc2]=f62,-256
508 stf.spill.nta [loc3]=f54,-256
509 adds loc0=96*16-48,in0
510 ;;
511 stf.spill.nta [loc2]=f46,-256
512 stf.spill.nta [loc3]=f38,-256
513 adds loc1=96*16-48-128,in0
514 ;;
515 stf.spill.nta [loc0]=f125,-256
516 stf.spill.nta [loc1]=f117,-256
517 ;;
518 stf.spill.nta [loc0]=f109,-256
519 stf.spill.nta [loc1]=f101,-256
520 ;;
521 stf.spill.nta [loc0]=f93,-256
522 stf.spill.nta [loc1]=f85,-256
523 ;;
524 stf.spill.nta [loc0]=f77,-256
525 stf.spill.nta [loc1]=f69,-256
526 ;;
527 stf.spill.nta [loc0]=f61,-256
528 stf.spill.nta [loc1]=f53,-256
529 adds loc2=96*16-64,in0
530 ;;
531 stf.spill.nta [loc0]=f45,-256
532 stf.spill.nta [loc1]=f37,-256
533 adds loc3=96*16-64-128,in0
534 ;;
535 stf.spill.nta [loc2]=f124,-256
536 stf.spill.nta [loc3]=f116,-256
537 ;;
538 stf.spill.nta [loc2]=f108,-256
539 stf.spill.nta [loc3]=f100,-256
540 ;;
541 stf.spill.nta [loc2]=f92,-256
542 stf.spill.nta [loc3]=f84,-256
543 ;;
544 stf.spill.nta [loc2]=f76,-256
545 stf.spill.nta [loc3]=f68,-256
546 ;;
547 stf.spill.nta [loc2]=f60,-256
548 stf.spill.nta [loc3]=f52,-256
549 adds loc0=96*16-80,in0
550 ;;
551 stf.spill.nta [loc2]=f44,-256
552 stf.spill.nta [loc3]=f36,-256
553 adds loc1=96*16-80-128,in0
554 ;;
555 stf.spill.nta [loc0]=f123,-256
556 stf.spill.nta [loc1]=f115,-256
557 ;;
558 stf.spill.nta [loc0]=f107,-256
559 stf.spill.nta [loc1]=f99,-256
560 ;;
561 stf.spill.nta [loc0]=f91,-256
562 stf.spill.nta [loc1]=f83,-256
563 ;;
564 stf.spill.nta [loc0]=f75,-256
565 stf.spill.nta [loc1]=f67,-256
566 ;;
567 stf.spill.nta [loc0]=f59,-256
568 stf.spill.nta [loc1]=f51,-256
569 adds loc2=96*16-96,in0
570 ;;
571 stf.spill.nta [loc0]=f43,-256
572 stf.spill.nta [loc1]=f35,-256
573 adds loc3=96*16-96-128,in0
574 ;;
575 stf.spill.nta [loc2]=f122,-256
576 stf.spill.nta [loc3]=f114,-256
577 ;;
578 stf.spill.nta [loc2]=f106,-256
579 stf.spill.nta [loc3]=f98,-256
580 ;;
581 stf.spill.nta [loc2]=f90,-256
582 stf.spill.nta [loc3]=f82,-256
583 ;;
584 stf.spill.nta [loc2]=f74,-256
585 stf.spill.nta [loc3]=f66,-256
586 ;;
587 stf.spill.nta [loc2]=f58,-256
588 stf.spill.nta [loc3]=f50,-256
589 adds loc0=96*16-112,in0
590 ;;
591 stf.spill.nta [loc2]=f42,-256
592 stf.spill.nta [loc3]=f34,-256
593 adds loc1=96*16-112-128,in0
594 ;;
595 stf.spill.nta [loc0]=f121,-256
596 stf.spill.nta [loc1]=f113,-256
597 ;;
598 stf.spill.nta [loc0]=f105,-256
599 stf.spill.nta [loc1]=f97,-256
600 ;;
601 stf.spill.nta [loc0]=f89,-256
602 stf.spill.nta [loc1]=f81,-256
603 ;;
604 stf.spill.nta [loc0]=f73,-256
605 stf.spill.nta [loc1]=f65,-256
606 ;;
607 stf.spill.nta [loc0]=f57,-256
608 stf.spill.nta [loc1]=f49,-256
609 adds loc2=96*16-128,in0
610 ;;
611 stf.spill.nta [loc0]=f41,-256
612 stf.spill.nta [loc1]=f33,-256
613 adds loc3=96*16-128-128,in0
614 ;;
615 stf.spill.nta [loc2]=f120,-256
616 stf.spill.nta [loc3]=f112,-256
617 ;;
618 stf.spill.nta [loc2]=f104,-256
619 stf.spill.nta [loc3]=f96,-256
620 ;;
621 stf.spill.nta [loc2]=f88,-256
622 stf.spill.nta [loc3]=f80,-256
623 ;;
624 stf.spill.nta [loc2]=f72,-256
625 stf.spill.nta [loc3]=f64,-256
626 ;;
627 stf.spill.nta [loc2]=f56,-256
628 stf.spill.nta [loc3]=f48,-256
629 ;;
630 stf.spill.nta [loc2]=f40
631 stf.spill.nta [loc3]=f32
632 br.ret.sptk.many rp
633END(__ia64_save_fpu)
634
635GLOBAL_ENTRY(__ia64_load_fpu)
636 alloc r2=ar.pfs,1,2,0,0
637 adds r3=128,in0
638 adds r14=256,in0
639 adds r15=384,in0
640 mov loc0=512
641 mov loc1=-1024+16
642 ;;
643 ldf.fill.nta f32=[in0],loc0
644 ldf.fill.nta f40=[ r3],loc0
645 ldf.fill.nta f48=[r14],loc0
646 ldf.fill.nta f56=[r15],loc0
647 ;;
648 ldf.fill.nta f64=[in0],loc0
649 ldf.fill.nta f72=[ r3],loc0
650 ldf.fill.nta f80=[r14],loc0
651 ldf.fill.nta f88=[r15],loc0
652 ;;
653 ldf.fill.nta f96=[in0],loc1
654 ldf.fill.nta f104=[ r3],loc1
655 ldf.fill.nta f112=[r14],loc1
656 ldf.fill.nta f120=[r15],loc1
657 ;;
658 ldf.fill.nta f33=[in0],loc0
659 ldf.fill.nta f41=[ r3],loc0
660 ldf.fill.nta f49=[r14],loc0
661 ldf.fill.nta f57=[r15],loc0
662 ;;
663 ldf.fill.nta f65=[in0],loc0
664 ldf.fill.nta f73=[ r3],loc0
665 ldf.fill.nta f81=[r14],loc0
666 ldf.fill.nta f89=[r15],loc0
667 ;;
668 ldf.fill.nta f97=[in0],loc1
669 ldf.fill.nta f105=[ r3],loc1
670 ldf.fill.nta f113=[r14],loc1
671 ldf.fill.nta f121=[r15],loc1
672 ;;
673 ldf.fill.nta f34=[in0],loc0
674 ldf.fill.nta f42=[ r3],loc0
675 ldf.fill.nta f50=[r14],loc0
676 ldf.fill.nta f58=[r15],loc0
677 ;;
678 ldf.fill.nta f66=[in0],loc0
679 ldf.fill.nta f74=[ r3],loc0
680 ldf.fill.nta f82=[r14],loc0
681 ldf.fill.nta f90=[r15],loc0
682 ;;
683 ldf.fill.nta f98=[in0],loc1
684 ldf.fill.nta f106=[ r3],loc1
685 ldf.fill.nta f114=[r14],loc1
686 ldf.fill.nta f122=[r15],loc1
687 ;;
688 ldf.fill.nta f35=[in0],loc0
689 ldf.fill.nta f43=[ r3],loc0
690 ldf.fill.nta f51=[r14],loc0
691 ldf.fill.nta f59=[r15],loc0
692 ;;
693 ldf.fill.nta f67=[in0],loc0
694 ldf.fill.nta f75=[ r3],loc0
695 ldf.fill.nta f83=[r14],loc0
696 ldf.fill.nta f91=[r15],loc0
697 ;;
698 ldf.fill.nta f99=[in0],loc1
699 ldf.fill.nta f107=[ r3],loc1
700 ldf.fill.nta f115=[r14],loc1
701 ldf.fill.nta f123=[r15],loc1
702 ;;
703 ldf.fill.nta f36=[in0],loc0
704 ldf.fill.nta f44=[ r3],loc0
705 ldf.fill.nta f52=[r14],loc0
706 ldf.fill.nta f60=[r15],loc0
707 ;;
708 ldf.fill.nta f68=[in0],loc0
709 ldf.fill.nta f76=[ r3],loc0
710 ldf.fill.nta f84=[r14],loc0
711 ldf.fill.nta f92=[r15],loc0
712 ;;
713 ldf.fill.nta f100=[in0],loc1
714 ldf.fill.nta f108=[ r3],loc1
715 ldf.fill.nta f116=[r14],loc1
716 ldf.fill.nta f124=[r15],loc1
717 ;;
718 ldf.fill.nta f37=[in0],loc0
719 ldf.fill.nta f45=[ r3],loc0
720 ldf.fill.nta f53=[r14],loc0
721 ldf.fill.nta f61=[r15],loc0
722 ;;
723 ldf.fill.nta f69=[in0],loc0
724 ldf.fill.nta f77=[ r3],loc0
725 ldf.fill.nta f85=[r14],loc0
726 ldf.fill.nta f93=[r15],loc0
727 ;;
728 ldf.fill.nta f101=[in0],loc1
729 ldf.fill.nta f109=[ r3],loc1
730 ldf.fill.nta f117=[r14],loc1
731 ldf.fill.nta f125=[r15],loc1
732 ;;
733 ldf.fill.nta f38 =[in0],loc0
734 ldf.fill.nta f46 =[ r3],loc0
735 ldf.fill.nta f54 =[r14],loc0
736 ldf.fill.nta f62 =[r15],loc0
737 ;;
738 ldf.fill.nta f70 =[in0],loc0
739 ldf.fill.nta f78 =[ r3],loc0
740 ldf.fill.nta f86 =[r14],loc0
741 ldf.fill.nta f94 =[r15],loc0
742 ;;
743 ldf.fill.nta f102=[in0],loc1
744 ldf.fill.nta f110=[ r3],loc1
745 ldf.fill.nta f118=[r14],loc1
746 ldf.fill.nta f126=[r15],loc1
747 ;;
748 ldf.fill.nta f39 =[in0],loc0
749 ldf.fill.nta f47 =[ r3],loc0
750 ldf.fill.nta f55 =[r14],loc0
751 ldf.fill.nta f63 =[r15],loc0
752 ;;
753 ldf.fill.nta f71 =[in0],loc0
754 ldf.fill.nta f79 =[ r3],loc0
755 ldf.fill.nta f87 =[r14],loc0
756 ldf.fill.nta f95 =[r15],loc0
757 ;;
758 ldf.fill.nta f103=[in0]
759 ldf.fill.nta f111=[ r3]
760 ldf.fill.nta f119=[r14]
761 ldf.fill.nta f127=[r15]
762 br.ret.sptk.many rp
763END(__ia64_load_fpu)
764
765GLOBAL_ENTRY(__ia64_init_fpu)
766 stf.spill [sp]=f0 // M3
767 mov f32=f0 // F
768 nop.b 0
769
770 ldfps f33,f34=[sp] // M0
771 ldfps f35,f36=[sp] // M1
772 mov f37=f0 // F
773 ;;
774
775 setf.s f38=r0 // M2
776 setf.s f39=r0 // M3
777 mov f40=f0 // F
778
779 ldfps f41,f42=[sp] // M0
780 ldfps f43,f44=[sp] // M1
781 mov f45=f0 // F
782
783 setf.s f46=r0 // M2
784 setf.s f47=r0 // M3
785 mov f48=f0 // F
786
787 ldfps f49,f50=[sp] // M0
788 ldfps f51,f52=[sp] // M1
789 mov f53=f0 // F
790
791 setf.s f54=r0 // M2
792 setf.s f55=r0 // M3
793 mov f56=f0 // F
794
795 ldfps f57,f58=[sp] // M0
796 ldfps f59,f60=[sp] // M1
797 mov f61=f0 // F
798
799 setf.s f62=r0 // M2
800 setf.s f63=r0 // M3
801 mov f64=f0 // F
802
803 ldfps f65,f66=[sp] // M0
804 ldfps f67,f68=[sp] // M1
805 mov f69=f0 // F
806
807 setf.s f70=r0 // M2
808 setf.s f71=r0 // M3
809 mov f72=f0 // F
810
811 ldfps f73,f74=[sp] // M0
812 ldfps f75,f76=[sp] // M1
813 mov f77=f0 // F
814
815 setf.s f78=r0 // M2
816 setf.s f79=r0 // M3
817 mov f80=f0 // F
818
819 ldfps f81,f82=[sp] // M0
820 ldfps f83,f84=[sp] // M1
821 mov f85=f0 // F
822
823 setf.s f86=r0 // M2
824 setf.s f87=r0 // M3
825 mov f88=f0 // F
826
827 /*
828 * When the instructions are cached, it would be faster to initialize
829 * the remaining registers with simply mov instructions (F-unit).
830 * This gets the time down to ~29 cycles. However, this would use up
831 * 33 bundles, whereas continuing with the above pattern yields
832 * 10 bundles and ~30 cycles.
833 */
834
835 ldfps f89,f90=[sp] // M0
836 ldfps f91,f92=[sp] // M1
837 mov f93=f0 // F
838
839 setf.s f94=r0 // M2
840 setf.s f95=r0 // M3
841 mov f96=f0 // F
842
843 ldfps f97,f98=[sp] // M0
844 ldfps f99,f100=[sp] // M1
845 mov f101=f0 // F
846
847 setf.s f102=r0 // M2
848 setf.s f103=r0 // M3
849 mov f104=f0 // F
850
851 ldfps f105,f106=[sp] // M0
852 ldfps f107,f108=[sp] // M1
853 mov f109=f0 // F
854
855 setf.s f110=r0 // M2
856 setf.s f111=r0 // M3
857 mov f112=f0 // F
858
859 ldfps f113,f114=[sp] // M0
860 ldfps f115,f116=[sp] // M1
861 mov f117=f0 // F
862
863 setf.s f118=r0 // M2
864 setf.s f119=r0 // M3
865 mov f120=f0 // F
866
867 ldfps f121,f122=[sp] // M0
868 ldfps f123,f124=[sp] // M1
869 mov f125=f0 // F
870
871 setf.s f126=r0 // M2
872 setf.s f127=r0 // M3
873 br.ret.sptk.many rp // F
874END(__ia64_init_fpu)
875
876/*
877 * Switch execution mode from virtual to physical
878 *
879 * Inputs:
880 * r16 = new psr to establish
881 * Output:
882 * r19 = old virtual address of ar.bsp
883 * r20 = old virtual address of sp
884 *
885 * Note: RSE must already be in enforced lazy mode
886 */
887GLOBAL_ENTRY(ia64_switch_mode_phys)
888 {
889 rsm psr.i | psr.ic // disable interrupts and interrupt collection
890 mov r15=ip
891 }
892 ;;
893 {
894 flushrs // must be first insn in group
895 srlz.i
896 }
897 ;;
898 mov cr.ipsr=r16 // set new PSR
899 add r3=1f-ia64_switch_mode_phys,r15
900
901 mov r19=ar.bsp
902 mov r20=sp
903 mov r14=rp // get return address into a general register
904 ;;
905
906 // going to physical mode, use tpa to translate virt->phys
907 tpa r17=r19
908 tpa r3=r3
909 tpa sp=sp
910 tpa r14=r14
911 ;;
912
913 mov r18=ar.rnat // save ar.rnat
914 mov ar.bspstore=r17 // this steps on ar.rnat
915 mov cr.iip=r3
916 mov cr.ifs=r0
917 ;;
918 mov ar.rnat=r18 // restore ar.rnat
919 rfi // must be last insn in group
920 ;;
9211: mov rp=r14
922 br.ret.sptk.many rp
923END(ia64_switch_mode_phys)
924
925/*
926 * Switch execution mode from physical to virtual
927 *
928 * Inputs:
929 * r16 = new psr to establish
930 * r19 = new bspstore to establish
931 * r20 = new sp to establish
932 *
933 * Note: RSE must already be in enforced lazy mode
934 */
935GLOBAL_ENTRY(ia64_switch_mode_virt)
936 {
937 rsm psr.i | psr.ic // disable interrupts and interrupt collection
938 mov r15=ip
939 }
940 ;;
941 {
942 flushrs // must be first insn in group
943 srlz.i
944 }
945 ;;
946 mov cr.ipsr=r16 // set new PSR
947 add r3=1f-ia64_switch_mode_virt,r15
948
949 mov r14=rp // get return address into a general register
950 ;;
951
952 // going to virtual
953 // - for code addresses, set upper bits of addr to KERNEL_START
954 // - for stack addresses, copy from input argument
955 movl r18=KERNEL_START
956 dep r3=0,r3,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
957 dep r14=0,r14,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
958 mov sp=r20
959 ;;
960 or r3=r3,r18
961 or r14=r14,r18
962 ;;
963
964 mov r18=ar.rnat // save ar.rnat
965 mov ar.bspstore=r19 // this steps on ar.rnat
966 mov cr.iip=r3
967 mov cr.ifs=r0
968 ;;
969 mov ar.rnat=r18 // restore ar.rnat
970 rfi // must be last insn in group
971 ;;
9721: mov rp=r14
973 br.ret.sptk.many rp
974END(ia64_switch_mode_virt)
975
976GLOBAL_ENTRY(ia64_delay_loop)
977 .prologue
978{ nop 0 // work around GAS unwind info generation bug...
979 .save ar.lc,r2
980 mov r2=ar.lc
981 .body
982 ;;
983 mov ar.lc=r32
984}
985 ;;
986 // force loop to be 32-byte aligned (GAS bug means we cannot use .align
987 // inside function body without corrupting unwind info).
988{ nop 0 }
9891: br.cloop.sptk.few 1b
990 ;;
991 mov ar.lc=r2
992 br.ret.sptk.many rp
993END(ia64_delay_loop)
994
995/*
996 * Return a CPU-local timestamp in nano-seconds. This timestamp is
997 * NOT synchronized across CPUs its return value must never be
998 * compared against the values returned on another CPU. The usage in
999 * kernel/sched/core.c ensures that.
1000 *
1001 * The return-value of sched_clock() is NOT supposed to wrap-around.
1002 * If it did, it would cause some scheduling hiccups (at the worst).
1003 * Fortunately, with a 64-bit cycle-counter ticking at 100GHz, even
1004 * that would happen only once every 5+ years.
1005 *
1006 * The code below basically calculates:
1007 *
1008 * (ia64_get_itc() * local_cpu_data->nsec_per_cyc) >> IA64_NSEC_PER_CYC_SHIFT
1009 *
1010 * except that the multiplication and the shift are done with 128-bit
1011 * intermediate precision so that we can produce a full 64-bit result.
1012 */
1013GLOBAL_ENTRY(ia64_native_sched_clock)
1014 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1015 mov.m r9=ar.itc // fetch cycle-counter (35 cyc)
1016 ;;
1017 ldf8 f8=[r8]
1018 ;;
1019 setf.sig f9=r9 // certain to stall, so issue it _after_ ldf8...
1020 ;;
1021 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1022 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1023 ;;
1024 getf.sig r8=f10 // (5 cyc)
1025 getf.sig r9=f11
1026 ;;
1027 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1028 br.ret.sptk.many rp
1029END(ia64_native_sched_clock)
1030
1031#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
1032GLOBAL_ENTRY(cycle_to_cputime)
1033 alloc r16=ar.pfs,1,0,0,0
1034 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
1035 ;;
1036 ldf8 f8=[r8]
1037 ;;
1038 setf.sig f9=r32
1039 ;;
1040 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
1041 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
1042 ;;
1043 getf.sig r8=f10 // (5 cyc)
1044 getf.sig r9=f11
1045 ;;
1046 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
1047 br.ret.sptk.many rp
1048END(cycle_to_cputime)
1049#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
1050
1051#ifdef CONFIG_IA64_BRL_EMU
1052
1053/*
1054 * Assembly routines used by brl_emu.c to set preserved register state.
1055 */
1056
1057#define SET_REG(reg) \
1058 GLOBAL_ENTRY(ia64_set_##reg); \
1059 alloc r16=ar.pfs,1,0,0,0; \
1060 mov reg=r32; \
1061 ;; \
1062 br.ret.sptk.many rp; \
1063 END(ia64_set_##reg)
1064
1065SET_REG(b1);
1066SET_REG(b2);
1067SET_REG(b3);
1068SET_REG(b4);
1069SET_REG(b5);
1070
1071#endif /* CONFIG_IA64_BRL_EMU */
1072
1073#ifdef CONFIG_SMP
1074
1075#ifdef CONFIG_HOTPLUG_CPU
1076GLOBAL_ENTRY(ia64_jump_to_sal)
1077 alloc r16=ar.pfs,1,0,0,0;;
1078 rsm psr.i | psr.ic
1079{
1080 flushrs
1081 srlz.i
1082}
1083 tpa r25=in0
1084 movl r18=tlb_purge_done;;
1085 DATA_VA_TO_PA(r18);;
1086 mov b1=r18 // Return location
1087 movl r18=ia64_do_tlb_purge;;
1088 DATA_VA_TO_PA(r18);;
1089 mov b2=r18 // doing tlb_flush work
1090 mov ar.rsc=0 // Put RSE in enforced lazy, LE mode
1091 movl r17=1f;;
1092 DATA_VA_TO_PA(r17);;
1093 mov cr.iip=r17
1094 movl r16=SAL_PSR_BITS_TO_SET;;
1095 mov cr.ipsr=r16
1096 mov cr.ifs=r0;;
1097 rfi;; // note: this unmask MCA/INIT (psr.mc)
10981:
1099 /*
1100 * Invalidate all TLB data/inst
1101 */
1102 br.sptk.many b2;; // jump to tlb purge code
1103
1104tlb_purge_done:
1105 RESTORE_REGION_REGS(r25, r17,r18,r19);;
1106 RESTORE_REG(b0, r25, r17);;
1107 RESTORE_REG(b1, r25, r17);;
1108 RESTORE_REG(b2, r25, r17);;
1109 RESTORE_REG(b3, r25, r17);;
1110 RESTORE_REG(b4, r25, r17);;
1111 RESTORE_REG(b5, r25, r17);;
1112 ld8 r1=[r25],0x08;;
1113 ld8 r12=[r25],0x08;;
1114 ld8 r13=[r25],0x08;;
1115 RESTORE_REG(ar.fpsr, r25, r17);;
1116 RESTORE_REG(ar.pfs, r25, r17);;
1117 RESTORE_REG(ar.rnat, r25, r17);;
1118 RESTORE_REG(ar.unat, r25, r17);;
1119 RESTORE_REG(ar.bspstore, r25, r17);;
1120 RESTORE_REG(cr.dcr, r25, r17);;
1121 RESTORE_REG(cr.iva, r25, r17);;
1122 RESTORE_REG(cr.pta, r25, r17);;
1123 srlz.d;; // required not to violate RAW dependency
1124 RESTORE_REG(cr.itv, r25, r17);;
1125 RESTORE_REG(cr.pmv, r25, r17);;
1126 RESTORE_REG(cr.cmcv, r25, r17);;
1127 RESTORE_REG(cr.lrr0, r25, r17);;
1128 RESTORE_REG(cr.lrr1, r25, r17);;
1129 ld8 r4=[r25],0x08;;
1130 ld8 r5=[r25],0x08;;
1131 ld8 r6=[r25],0x08;;
1132 ld8 r7=[r25],0x08;;
1133 ld8 r17=[r25],0x08;;
1134 mov pr=r17,-1;;
1135 RESTORE_REG(ar.lc, r25, r17);;
1136 /*
1137 * Now Restore floating point regs
1138 */
1139 ldf.fill.nta f2=[r25],16;;
1140 ldf.fill.nta f3=[r25],16;;
1141 ldf.fill.nta f4=[r25],16;;
1142 ldf.fill.nta f5=[r25],16;;
1143 ldf.fill.nta f16=[r25],16;;
1144 ldf.fill.nta f17=[r25],16;;
1145 ldf.fill.nta f18=[r25],16;;
1146 ldf.fill.nta f19=[r25],16;;
1147 ldf.fill.nta f20=[r25],16;;
1148 ldf.fill.nta f21=[r25],16;;
1149 ldf.fill.nta f22=[r25],16;;
1150 ldf.fill.nta f23=[r25],16;;
1151 ldf.fill.nta f24=[r25],16;;
1152 ldf.fill.nta f25=[r25],16;;
1153 ldf.fill.nta f26=[r25],16;;
1154 ldf.fill.nta f27=[r25],16;;
1155 ldf.fill.nta f28=[r25],16;;
1156 ldf.fill.nta f29=[r25],16;;
1157 ldf.fill.nta f30=[r25],16;;
1158 ldf.fill.nta f31=[r25],16;;
1159
1160 /*
1161 * Now that we have done all the register restores
1162 * we are now ready for the big DIVE to SAL Land
1163 */
1164 ssm psr.ic;;
1165 srlz.d;;
1166 br.ret.sptk.many b0;;
1167END(ia64_jump_to_sal)
1168#endif /* CONFIG_HOTPLUG_CPU */
1169
1170#endif /* CONFIG_SMP */