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/mca_asm.h> 34#include <linux/init.h> 35#include <linux/linkage.h> 36 37#ifdef CONFIG_HOTPLUG_CPU 38#define SAL_PSR_BITS_TO_SET \ 39 (IA64_PSR_AC | IA64_PSR_BN | IA64_PSR_MFH | IA64_PSR_MFL) 40 41#define SAVE_FROM_REG(src, ptr, dest) \ 42 mov dest=src;; \ 43 st8 [ptr]=dest,0x08 44 45#define RESTORE_REG(reg, ptr, _tmp) \ 46 ld8 _tmp=[ptr],0x08;; \ 47 mov reg=_tmp 48 49#define SAVE_BREAK_REGS(ptr, _idx, _breg, _dest)\ 50 mov ar.lc=IA64_NUM_DBG_REGS-1;; \ 51 mov _idx=0;; \ 521: \ 53 SAVE_FROM_REG(_breg[_idx], ptr, _dest);; \ 54 add _idx=1,_idx;; \ 55 br.cloop.sptk.many 1b 56 57#define RESTORE_BREAK_REGS(ptr, _idx, _breg, _tmp, _lbl)\ 58 mov ar.lc=IA64_NUM_DBG_REGS-1;; \ 59 mov _idx=0;; \ 60_lbl: RESTORE_REG(_breg[_idx], ptr, _tmp);; \ 61 add _idx=1, _idx;; \ 62 br.cloop.sptk.many _lbl 63 64#define SAVE_ONE_RR(num, _reg, _tmp) \ 65 movl _tmp=(num<<61);; \ 66 mov _reg=rr[_tmp] 67 68#define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \ 69 SAVE_ONE_RR(0,_r0, _tmp);; \ 70 SAVE_ONE_RR(1,_r1, _tmp);; \ 71 SAVE_ONE_RR(2,_r2, _tmp);; \ 72 SAVE_ONE_RR(3,_r3, _tmp);; \ 73 SAVE_ONE_RR(4,_r4, _tmp);; \ 74 SAVE_ONE_RR(5,_r5, _tmp);; \ 75 SAVE_ONE_RR(6,_r6, _tmp);; \ 76 SAVE_ONE_RR(7,_r7, _tmp);; 77 78#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \ 79 st8 [ptr]=_r0, 8;; \ 80 st8 [ptr]=_r1, 8;; \ 81 st8 [ptr]=_r2, 8;; \ 82 st8 [ptr]=_r3, 8;; \ 83 st8 [ptr]=_r4, 8;; \ 84 st8 [ptr]=_r5, 8;; \ 85 st8 [ptr]=_r6, 8;; \ 86 st8 [ptr]=_r7, 8;; 87 88#define RESTORE_REGION_REGS(ptr, _idx1, _idx2, _tmp) \ 89 mov ar.lc=0x08-1;; \ 90 movl _idx1=0x00;; \ 91RestRR: \ 92 dep.z _idx2=_idx1,61,3;; \ 93 ld8 _tmp=[ptr],8;; \ 94 mov rr[_idx2]=_tmp;; \ 95 srlz.d;; \ 96 add _idx1=1,_idx1;; \ 97 br.cloop.sptk.few RestRR 98 99#define SET_AREA_FOR_BOOTING_CPU(reg1, reg2) \ 100 movl reg1=sal_state_for_booting_cpu;; \ 101 ld8 reg2=[reg1];; 102 103/* 104 * Adjust region registers saved before starting to save 105 * break regs and rest of the states that need to be preserved. 106 */ 107#define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(_reg1,_reg2,_pred) \ 108 SAVE_FROM_REG(b0,_reg1,_reg2);; \ 109 SAVE_FROM_REG(b1,_reg1,_reg2);; \ 110 SAVE_FROM_REG(b2,_reg1,_reg2);; \ 111 SAVE_FROM_REG(b3,_reg1,_reg2);; \ 112 SAVE_FROM_REG(b4,_reg1,_reg2);; \ 113 SAVE_FROM_REG(b5,_reg1,_reg2);; \ 114 st8 [_reg1]=r1,0x08;; \ 115 st8 [_reg1]=r12,0x08;; \ 116 st8 [_reg1]=r13,0x08;; \ 117 SAVE_FROM_REG(ar.fpsr,_reg1,_reg2);; \ 118 SAVE_FROM_REG(ar.pfs,_reg1,_reg2);; \ 119 SAVE_FROM_REG(ar.rnat,_reg1,_reg2);; \ 120 SAVE_FROM_REG(ar.unat,_reg1,_reg2);; \ 121 SAVE_FROM_REG(ar.bspstore,_reg1,_reg2);; \ 122 SAVE_FROM_REG(cr.dcr,_reg1,_reg2);; \ 123 SAVE_FROM_REG(cr.iva,_reg1,_reg2);; \ 124 SAVE_FROM_REG(cr.pta,_reg1,_reg2);; \ 125 SAVE_FROM_REG(cr.itv,_reg1,_reg2);; \ 126 SAVE_FROM_REG(cr.pmv,_reg1,_reg2);; \ 127 SAVE_FROM_REG(cr.cmcv,_reg1,_reg2);; \ 128 SAVE_FROM_REG(cr.lrr0,_reg1,_reg2);; \ 129 SAVE_FROM_REG(cr.lrr1,_reg1,_reg2);; \ 130 st8 [_reg1]=r4,0x08;; \ 131 st8 [_reg1]=r5,0x08;; \ 132 st8 [_reg1]=r6,0x08;; \ 133 st8 [_reg1]=r7,0x08;; \ 134 st8 [_reg1]=_pred,0x08;; \ 135 SAVE_FROM_REG(ar.lc, _reg1, _reg2);; \ 136 stf.spill.nta [_reg1]=f2,16;; \ 137 stf.spill.nta [_reg1]=f3,16;; \ 138 stf.spill.nta [_reg1]=f4,16;; \ 139 stf.spill.nta [_reg1]=f5,16;; \ 140 stf.spill.nta [_reg1]=f16,16;; \ 141 stf.spill.nta [_reg1]=f17,16;; \ 142 stf.spill.nta [_reg1]=f18,16;; \ 143 stf.spill.nta [_reg1]=f19,16;; \ 144 stf.spill.nta [_reg1]=f20,16;; \ 145 stf.spill.nta [_reg1]=f21,16;; \ 146 stf.spill.nta [_reg1]=f22,16;; \ 147 stf.spill.nta [_reg1]=f23,16;; \ 148 stf.spill.nta [_reg1]=f24,16;; \ 149 stf.spill.nta [_reg1]=f25,16;; \ 150 stf.spill.nta [_reg1]=f26,16;; \ 151 stf.spill.nta [_reg1]=f27,16;; \ 152 stf.spill.nta [_reg1]=f28,16;; \ 153 stf.spill.nta [_reg1]=f29,16;; \ 154 stf.spill.nta [_reg1]=f30,16;; \ 155 stf.spill.nta [_reg1]=f31,16;; 156 157#else 158#define SET_AREA_FOR_BOOTING_CPU(a1, a2) 159#define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(a1,a2, a3) 160#define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) 161#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) 162#endif 163 164#define SET_ONE_RR(num, pgsize, _tmp1, _tmp2, vhpt) \ 165 movl _tmp1=(num << 61);; \ 166 mov _tmp2=((ia64_rid(IA64_REGION_ID_KERNEL, (num<<61)) << 8) | (pgsize << 2) | vhpt);; \ 167 mov rr[_tmp1]=_tmp2 168 169 __PAGE_ALIGNED_DATA 170 171 .global empty_zero_page 172empty_zero_page: 173 .skip PAGE_SIZE 174 175 .global swapper_pg_dir 176swapper_pg_dir: 177 .skip PAGE_SIZE 178 179 .rodata 180halt_msg: 181 stringz "Halting kernel\n" 182 183 __REF 184 185 .global start_ap 186 187 /* 188 * Start the kernel. When the bootloader passes control to _start(), r28 189 * points to the address of the boot parameter area. Execution reaches 190 * here in physical mode. 191 */ 192GLOBAL_ENTRY(_start) 193start_ap: 194 .prologue 195 .save rp, r0 // terminate unwind chain with a NULL rp 196 .body 197 198 rsm psr.i | psr.ic 199 ;; 200 srlz.i 201 ;; 202 { 203 flushrs // must be first insn in group 204 srlz.i 205 } 206 ;; 207 /* 208 * Save the region registers, predicate before they get clobbered 209 */ 210 SAVE_REGION_REGS(r2, r8,r9,r10,r11,r12,r13,r14,r15); 211 mov r25=pr;; 212 213 /* 214 * Initialize kernel region registers: 215 * rr[0]: VHPT enabled, page size = PAGE_SHIFT 216 * rr[1]: VHPT enabled, page size = PAGE_SHIFT 217 * rr[2]: VHPT enabled, page size = PAGE_SHIFT 218 * rr[3]: VHPT enabled, page size = PAGE_SHIFT 219 * rr[4]: VHPT enabled, page size = PAGE_SHIFT 220 * rr[5]: VHPT enabled, page size = PAGE_SHIFT 221 * rr[6]: VHPT disabled, page size = IA64_GRANULE_SHIFT 222 * rr[7]: VHPT disabled, page size = IA64_GRANULE_SHIFT 223 * We initialize all of them to prevent inadvertently assuming 224 * something about the state of address translation early in boot. 225 */ 226 SET_ONE_RR(0, PAGE_SHIFT, r2, r16, 1);; 227 SET_ONE_RR(1, PAGE_SHIFT, r2, r16, 1);; 228 SET_ONE_RR(2, PAGE_SHIFT, r2, r16, 1);; 229 SET_ONE_RR(3, PAGE_SHIFT, r2, r16, 1);; 230 SET_ONE_RR(4, PAGE_SHIFT, r2, r16, 1);; 231 SET_ONE_RR(5, PAGE_SHIFT, r2, r16, 1);; 232 SET_ONE_RR(6, IA64_GRANULE_SHIFT, r2, r16, 0);; 233 SET_ONE_RR(7, IA64_GRANULE_SHIFT, r2, r16, 0);; 234 /* 235 * Now pin mappings into the TLB for kernel text and data 236 */ 237 mov r18=KERNEL_TR_PAGE_SHIFT<<2 238 movl r17=KERNEL_START 239 ;; 240 mov cr.itir=r18 241 mov cr.ifa=r17 242 mov r16=IA64_TR_KERNEL 243 mov r3=ip 244 movl r18=PAGE_KERNEL 245 ;; 246 dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT 247 ;; 248 or r18=r2,r18 249 ;; 250 srlz.i 251 ;; 252 itr.i itr[r16]=r18 253 ;; 254 itr.d dtr[r16]=r18 255 ;; 256 srlz.i 257 258 /* 259 * Switch into virtual mode: 260 */ 261 movl r16=(IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN \ 262 |IA64_PSR_DI) 263 ;; 264 mov cr.ipsr=r16 265 movl r17=1f 266 ;; 267 mov cr.iip=r17 268 mov cr.ifs=r0 269 ;; 270 rfi 271 ;; 2721: // now we are in virtual mode 273 274 SET_AREA_FOR_BOOTING_CPU(r2, r16); 275 276 STORE_REGION_REGS(r16, r8,r9,r10,r11,r12,r13,r14,r15); 277 SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(r16,r17,r25) 278 ;; 279 280 // set IVT entry point---can't access I/O ports without it 281 movl r3=ia64_ivt 282 ;; 283 mov cr.iva=r3 284 movl r2=FPSR_DEFAULT 285 ;; 286 srlz.i 287 movl gp=__gp 288 289 mov ar.fpsr=r2 290 ;; 291 292#define isAP p2 // are we an Application Processor? 293#define isBP p3 // are we the Bootstrap Processor? 294 295#ifdef CONFIG_SMP 296 /* 297 * Find the init_task for the currently booting CPU. At poweron, and in 298 * UP mode, task_for_booting_cpu is NULL. 299 */ 300 movl r3=task_for_booting_cpu 301 ;; 302 ld8 r3=[r3] 303 movl r2=init_task 304 ;; 305 cmp.eq isBP,isAP=r3,r0 306 ;; 307(isAP) mov r2=r3 308#else 309 movl r2=init_task 310 cmp.eq isBP,isAP=r0,r0 311#endif 312 ;; 313 tpa r3=r2 // r3 == phys addr of task struct 314 mov r16=-1 315(isBP) br.cond.dpnt .load_current // BP stack is on region 5 --- no need to map it 316 317 // load mapping for stack (virtaddr in r2, physaddr in r3) 318 rsm psr.ic 319 movl r17=PAGE_KERNEL 320 ;; 321 srlz.d 322 dep r18=0,r3,0,12 323 ;; 324 or r18=r17,r18 325 dep r2=-1,r3,61,3 // IMVA of task 326 ;; 327 mov r17=rr[r2] 328 shr.u r16=r3,IA64_GRANULE_SHIFT 329 ;; 330 dep r17=0,r17,8,24 331 ;; 332 mov cr.itir=r17 333 mov cr.ifa=r2 334 335 mov r19=IA64_TR_CURRENT_STACK 336 ;; 337 itr.d dtr[r19]=r18 338 ;; 339 ssm psr.ic 340 srlz.d 341 ;; 342 343.load_current: 344 // load the "current" pointer (r13) and ar.k6 with the current task 345 mov IA64_KR(CURRENT)=r2 // virtual address 346 mov IA64_KR(CURRENT_STACK)=r16 347 mov r13=r2 348 /* 349 * Reserve space at the top of the stack for "struct pt_regs". Kernel 350 * threads don't store interesting values in that structure, but the space 351 * still needs to be there because time-critical stuff such as the context 352 * switching can be implemented more efficiently (for example, __switch_to() 353 * always sets the psr.dfh bit of the task it is switching to). 354 */ 355 356 addl r12=IA64_STK_OFFSET-IA64_PT_REGS_SIZE-16,r2 357 addl r2=IA64_RBS_OFFSET,r2 // initialize the RSE 358 mov ar.rsc=0 // place RSE in enforced lazy mode 359 ;; 360 loadrs // clear the dirty partition 361 movl r19=__phys_per_cpu_start 362 mov r18=PERCPU_PAGE_SIZE 363 ;; 364#ifndef CONFIG_SMP 365 add r19=r19,r18 366 ;; 367#else 368(isAP) br.few 2f 369 movl r20=__cpu0_per_cpu 370 ;; 371 shr.u r18=r18,3 3721: 373 ld8 r21=[r19],8;; 374 st8[r20]=r21,8 375 adds r18=-1,r18;; 376 cmp4.lt p7,p6=0,r18 377(p7) br.cond.dptk.few 1b 378 mov r19=r20 379 ;; 3802: 381#endif 382 tpa r19=r19 383 ;; 384 .pred.rel.mutex isBP,isAP 385(isBP) mov IA64_KR(PER_CPU_DATA)=r19 // per-CPU base for cpu0 386(isAP) mov IA64_KR(PER_CPU_DATA)=r0 // clear physical per-CPU base 387 ;; 388 mov ar.bspstore=r2 // establish the new RSE stack 389 ;; 390 mov ar.rsc=0x3 // place RSE in eager mode 391 392(isBP) dep r28=-1,r28,61,3 // make address virtual 393(isBP) movl r2=ia64_boot_param 394 ;; 395(isBP) st8 [r2]=r28 // save the address of the boot param area passed by the bootloader 396 397#ifdef CONFIG_PARAVIRT 398 399 movl r14=hypervisor_setup_hooks 400 movl r15=hypervisor_type 401 mov r16=num_hypervisor_hooks 402 ;; 403 ld8 r2=[r15] 404 ;; 405 cmp.ltu p7,p0=r2,r16 // array size check 406 shladd r8=r2,3,r14 407 ;; 408(p7) ld8 r9=[r8] 409 ;; 410(p7) mov b1=r9 411(p7) cmp.ne.unc p7,p0=r9,r0 // no actual branch to NULL 412 ;; 413(p7) br.call.sptk.many rp=b1 414 415 __INITDATA 416 417default_setup_hook = 0 // Currently nothing needs to be done. 418 419 .global hypervisor_type 420hypervisor_type: 421 data8 PARAVIRT_HYPERVISOR_TYPE_DEFAULT 422 423 // must have the same order with PARAVIRT_HYPERVISOR_TYPE_xxx 424 425hypervisor_setup_hooks: 426 data8 default_setup_hook 427num_hypervisor_hooks = (. - hypervisor_setup_hooks) / 8 428 .previous 429 430#endif 431 432#ifdef CONFIG_SMP 433(isAP) br.call.sptk.many rp=start_secondary 434.ret0: 435(isAP) br.cond.sptk self 436#endif 437 438 // This is executed by the bootstrap processor (bsp) only: 439 440#ifdef CONFIG_IA64_FW_EMU 441 // initialize PAL & SAL emulator: 442 br.call.sptk.many rp=sys_fw_init 443.ret1: 444#endif 445 br.call.sptk.many rp=start_kernel 446.ret2: addl r3=@ltoff(halt_msg),gp 447 ;; 448 alloc r2=ar.pfs,8,0,2,0 449 ;; 450 ld8 out0=[r3] 451 br.call.sptk.many b0=console_print 452 453self: hint @pause 454 br.sptk.many self // endless loop 455END(_start) 456 457 .text 458 459GLOBAL_ENTRY(ia64_save_debug_regs) 460 alloc r16=ar.pfs,1,0,0,0 461 mov r20=ar.lc // preserve ar.lc 462 mov ar.lc=IA64_NUM_DBG_REGS-1 463 mov r18=0 464 add r19=IA64_NUM_DBG_REGS*8,in0 465 ;; 4661: mov r16=dbr[r18] 467#ifdef CONFIG_ITANIUM 468 ;; 469 srlz.d 470#endif 471 mov r17=ibr[r18] 472 add r18=1,r18 473 ;; 474 st8.nta [in0]=r16,8 475 st8.nta [r19]=r17,8 476 br.cloop.sptk.many 1b 477 ;; 478 mov ar.lc=r20 // restore ar.lc 479 br.ret.sptk.many rp 480END(ia64_save_debug_regs) 481 482GLOBAL_ENTRY(ia64_load_debug_regs) 483 alloc r16=ar.pfs,1,0,0,0 484 lfetch.nta [in0] 485 mov r20=ar.lc // preserve ar.lc 486 add r19=IA64_NUM_DBG_REGS*8,in0 487 mov ar.lc=IA64_NUM_DBG_REGS-1 488 mov r18=-1 489 ;; 4901: ld8.nta r16=[in0],8 491 ld8.nta r17=[r19],8 492 add r18=1,r18 493 ;; 494 mov dbr[r18]=r16 495#ifdef CONFIG_ITANIUM 496 ;; 497 srlz.d // Errata 132 (NoFix status) 498#endif 499 mov ibr[r18]=r17 500 br.cloop.sptk.many 1b 501 ;; 502 mov ar.lc=r20 // restore ar.lc 503 br.ret.sptk.many rp 504END(ia64_load_debug_regs) 505 506GLOBAL_ENTRY(__ia64_save_fpu) 507 alloc r2=ar.pfs,1,4,0,0 508 adds loc0=96*16-16,in0 509 adds loc1=96*16-16-128,in0 510 ;; 511 stf.spill.nta [loc0]=f127,-256 512 stf.spill.nta [loc1]=f119,-256 513 ;; 514 stf.spill.nta [loc0]=f111,-256 515 stf.spill.nta [loc1]=f103,-256 516 ;; 517 stf.spill.nta [loc0]=f95,-256 518 stf.spill.nta [loc1]=f87,-256 519 ;; 520 stf.spill.nta [loc0]=f79,-256 521 stf.spill.nta [loc1]=f71,-256 522 ;; 523 stf.spill.nta [loc0]=f63,-256 524 stf.spill.nta [loc1]=f55,-256 525 adds loc2=96*16-32,in0 526 ;; 527 stf.spill.nta [loc0]=f47,-256 528 stf.spill.nta [loc1]=f39,-256 529 adds loc3=96*16-32-128,in0 530 ;; 531 stf.spill.nta [loc2]=f126,-256 532 stf.spill.nta [loc3]=f118,-256 533 ;; 534 stf.spill.nta [loc2]=f110,-256 535 stf.spill.nta [loc3]=f102,-256 536 ;; 537 stf.spill.nta [loc2]=f94,-256 538 stf.spill.nta [loc3]=f86,-256 539 ;; 540 stf.spill.nta [loc2]=f78,-256 541 stf.spill.nta [loc3]=f70,-256 542 ;; 543 stf.spill.nta [loc2]=f62,-256 544 stf.spill.nta [loc3]=f54,-256 545 adds loc0=96*16-48,in0 546 ;; 547 stf.spill.nta [loc2]=f46,-256 548 stf.spill.nta [loc3]=f38,-256 549 adds loc1=96*16-48-128,in0 550 ;; 551 stf.spill.nta [loc0]=f125,-256 552 stf.spill.nta [loc1]=f117,-256 553 ;; 554 stf.spill.nta [loc0]=f109,-256 555 stf.spill.nta [loc1]=f101,-256 556 ;; 557 stf.spill.nta [loc0]=f93,-256 558 stf.spill.nta [loc1]=f85,-256 559 ;; 560 stf.spill.nta [loc0]=f77,-256 561 stf.spill.nta [loc1]=f69,-256 562 ;; 563 stf.spill.nta [loc0]=f61,-256 564 stf.spill.nta [loc1]=f53,-256 565 adds loc2=96*16-64,in0 566 ;; 567 stf.spill.nta [loc0]=f45,-256 568 stf.spill.nta [loc1]=f37,-256 569 adds loc3=96*16-64-128,in0 570 ;; 571 stf.spill.nta [loc2]=f124,-256 572 stf.spill.nta [loc3]=f116,-256 573 ;; 574 stf.spill.nta [loc2]=f108,-256 575 stf.spill.nta [loc3]=f100,-256 576 ;; 577 stf.spill.nta [loc2]=f92,-256 578 stf.spill.nta [loc3]=f84,-256 579 ;; 580 stf.spill.nta [loc2]=f76,-256 581 stf.spill.nta [loc3]=f68,-256 582 ;; 583 stf.spill.nta [loc2]=f60,-256 584 stf.spill.nta [loc3]=f52,-256 585 adds loc0=96*16-80,in0 586 ;; 587 stf.spill.nta [loc2]=f44,-256 588 stf.spill.nta [loc3]=f36,-256 589 adds loc1=96*16-80-128,in0 590 ;; 591 stf.spill.nta [loc0]=f123,-256 592 stf.spill.nta [loc1]=f115,-256 593 ;; 594 stf.spill.nta [loc0]=f107,-256 595 stf.spill.nta [loc1]=f99,-256 596 ;; 597 stf.spill.nta [loc0]=f91,-256 598 stf.spill.nta [loc1]=f83,-256 599 ;; 600 stf.spill.nta [loc0]=f75,-256 601 stf.spill.nta [loc1]=f67,-256 602 ;; 603 stf.spill.nta [loc0]=f59,-256 604 stf.spill.nta [loc1]=f51,-256 605 adds loc2=96*16-96,in0 606 ;; 607 stf.spill.nta [loc0]=f43,-256 608 stf.spill.nta [loc1]=f35,-256 609 adds loc3=96*16-96-128,in0 610 ;; 611 stf.spill.nta [loc2]=f122,-256 612 stf.spill.nta [loc3]=f114,-256 613 ;; 614 stf.spill.nta [loc2]=f106,-256 615 stf.spill.nta [loc3]=f98,-256 616 ;; 617 stf.spill.nta [loc2]=f90,-256 618 stf.spill.nta [loc3]=f82,-256 619 ;; 620 stf.spill.nta [loc2]=f74,-256 621 stf.spill.nta [loc3]=f66,-256 622 ;; 623 stf.spill.nta [loc2]=f58,-256 624 stf.spill.nta [loc3]=f50,-256 625 adds loc0=96*16-112,in0 626 ;; 627 stf.spill.nta [loc2]=f42,-256 628 stf.spill.nta [loc3]=f34,-256 629 adds loc1=96*16-112-128,in0 630 ;; 631 stf.spill.nta [loc0]=f121,-256 632 stf.spill.nta [loc1]=f113,-256 633 ;; 634 stf.spill.nta [loc0]=f105,-256 635 stf.spill.nta [loc1]=f97,-256 636 ;; 637 stf.spill.nta [loc0]=f89,-256 638 stf.spill.nta [loc1]=f81,-256 639 ;; 640 stf.spill.nta [loc0]=f73,-256 641 stf.spill.nta [loc1]=f65,-256 642 ;; 643 stf.spill.nta [loc0]=f57,-256 644 stf.spill.nta [loc1]=f49,-256 645 adds loc2=96*16-128,in0 646 ;; 647 stf.spill.nta [loc0]=f41,-256 648 stf.spill.nta [loc1]=f33,-256 649 adds loc3=96*16-128-128,in0 650 ;; 651 stf.spill.nta [loc2]=f120,-256 652 stf.spill.nta [loc3]=f112,-256 653 ;; 654 stf.spill.nta [loc2]=f104,-256 655 stf.spill.nta [loc3]=f96,-256 656 ;; 657 stf.spill.nta [loc2]=f88,-256 658 stf.spill.nta [loc3]=f80,-256 659 ;; 660 stf.spill.nta [loc2]=f72,-256 661 stf.spill.nta [loc3]=f64,-256 662 ;; 663 stf.spill.nta [loc2]=f56,-256 664 stf.spill.nta [loc3]=f48,-256 665 ;; 666 stf.spill.nta [loc2]=f40 667 stf.spill.nta [loc3]=f32 668 br.ret.sptk.many rp 669END(__ia64_save_fpu) 670 671GLOBAL_ENTRY(__ia64_load_fpu) 672 alloc r2=ar.pfs,1,2,0,0 673 adds r3=128,in0 674 adds r14=256,in0 675 adds r15=384,in0 676 mov loc0=512 677 mov loc1=-1024+16 678 ;; 679 ldf.fill.nta f32=[in0],loc0 680 ldf.fill.nta f40=[ r3],loc0 681 ldf.fill.nta f48=[r14],loc0 682 ldf.fill.nta f56=[r15],loc0 683 ;; 684 ldf.fill.nta f64=[in0],loc0 685 ldf.fill.nta f72=[ r3],loc0 686 ldf.fill.nta f80=[r14],loc0 687 ldf.fill.nta f88=[r15],loc0 688 ;; 689 ldf.fill.nta f96=[in0],loc1 690 ldf.fill.nta f104=[ r3],loc1 691 ldf.fill.nta f112=[r14],loc1 692 ldf.fill.nta f120=[r15],loc1 693 ;; 694 ldf.fill.nta f33=[in0],loc0 695 ldf.fill.nta f41=[ r3],loc0 696 ldf.fill.nta f49=[r14],loc0 697 ldf.fill.nta f57=[r15],loc0 698 ;; 699 ldf.fill.nta f65=[in0],loc0 700 ldf.fill.nta f73=[ r3],loc0 701 ldf.fill.nta f81=[r14],loc0 702 ldf.fill.nta f89=[r15],loc0 703 ;; 704 ldf.fill.nta f97=[in0],loc1 705 ldf.fill.nta f105=[ r3],loc1 706 ldf.fill.nta f113=[r14],loc1 707 ldf.fill.nta f121=[r15],loc1 708 ;; 709 ldf.fill.nta f34=[in0],loc0 710 ldf.fill.nta f42=[ r3],loc0 711 ldf.fill.nta f50=[r14],loc0 712 ldf.fill.nta f58=[r15],loc0 713 ;; 714 ldf.fill.nta f66=[in0],loc0 715 ldf.fill.nta f74=[ r3],loc0 716 ldf.fill.nta f82=[r14],loc0 717 ldf.fill.nta f90=[r15],loc0 718 ;; 719 ldf.fill.nta f98=[in0],loc1 720 ldf.fill.nta f106=[ r3],loc1 721 ldf.fill.nta f114=[r14],loc1 722 ldf.fill.nta f122=[r15],loc1 723 ;; 724 ldf.fill.nta f35=[in0],loc0 725 ldf.fill.nta f43=[ r3],loc0 726 ldf.fill.nta f51=[r14],loc0 727 ldf.fill.nta f59=[r15],loc0 728 ;; 729 ldf.fill.nta f67=[in0],loc0 730 ldf.fill.nta f75=[ r3],loc0 731 ldf.fill.nta f83=[r14],loc0 732 ldf.fill.nta f91=[r15],loc0 733 ;; 734 ldf.fill.nta f99=[in0],loc1 735 ldf.fill.nta f107=[ r3],loc1 736 ldf.fill.nta f115=[r14],loc1 737 ldf.fill.nta f123=[r15],loc1 738 ;; 739 ldf.fill.nta f36=[in0],loc0 740 ldf.fill.nta f44=[ r3],loc0 741 ldf.fill.nta f52=[r14],loc0 742 ldf.fill.nta f60=[r15],loc0 743 ;; 744 ldf.fill.nta f68=[in0],loc0 745 ldf.fill.nta f76=[ r3],loc0 746 ldf.fill.nta f84=[r14],loc0 747 ldf.fill.nta f92=[r15],loc0 748 ;; 749 ldf.fill.nta f100=[in0],loc1 750 ldf.fill.nta f108=[ r3],loc1 751 ldf.fill.nta f116=[r14],loc1 752 ldf.fill.nta f124=[r15],loc1 753 ;; 754 ldf.fill.nta f37=[in0],loc0 755 ldf.fill.nta f45=[ r3],loc0 756 ldf.fill.nta f53=[r14],loc0 757 ldf.fill.nta f61=[r15],loc0 758 ;; 759 ldf.fill.nta f69=[in0],loc0 760 ldf.fill.nta f77=[ r3],loc0 761 ldf.fill.nta f85=[r14],loc0 762 ldf.fill.nta f93=[r15],loc0 763 ;; 764 ldf.fill.nta f101=[in0],loc1 765 ldf.fill.nta f109=[ r3],loc1 766 ldf.fill.nta f117=[r14],loc1 767 ldf.fill.nta f125=[r15],loc1 768 ;; 769 ldf.fill.nta f38 =[in0],loc0 770 ldf.fill.nta f46 =[ r3],loc0 771 ldf.fill.nta f54 =[r14],loc0 772 ldf.fill.nta f62 =[r15],loc0 773 ;; 774 ldf.fill.nta f70 =[in0],loc0 775 ldf.fill.nta f78 =[ r3],loc0 776 ldf.fill.nta f86 =[r14],loc0 777 ldf.fill.nta f94 =[r15],loc0 778 ;; 779 ldf.fill.nta f102=[in0],loc1 780 ldf.fill.nta f110=[ r3],loc1 781 ldf.fill.nta f118=[r14],loc1 782 ldf.fill.nta f126=[r15],loc1 783 ;; 784 ldf.fill.nta f39 =[in0],loc0 785 ldf.fill.nta f47 =[ r3],loc0 786 ldf.fill.nta f55 =[r14],loc0 787 ldf.fill.nta f63 =[r15],loc0 788 ;; 789 ldf.fill.nta f71 =[in0],loc0 790 ldf.fill.nta f79 =[ r3],loc0 791 ldf.fill.nta f87 =[r14],loc0 792 ldf.fill.nta f95 =[r15],loc0 793 ;; 794 ldf.fill.nta f103=[in0] 795 ldf.fill.nta f111=[ r3] 796 ldf.fill.nta f119=[r14] 797 ldf.fill.nta f127=[r15] 798 br.ret.sptk.many rp 799END(__ia64_load_fpu) 800 801GLOBAL_ENTRY(__ia64_init_fpu) 802 stf.spill [sp]=f0 // M3 803 mov f32=f0 // F 804 nop.b 0 805 806 ldfps f33,f34=[sp] // M0 807 ldfps f35,f36=[sp] // M1 808 mov f37=f0 // F 809 ;; 810 811 setf.s f38=r0 // M2 812 setf.s f39=r0 // M3 813 mov f40=f0 // F 814 815 ldfps f41,f42=[sp] // M0 816 ldfps f43,f44=[sp] // M1 817 mov f45=f0 // F 818 819 setf.s f46=r0 // M2 820 setf.s f47=r0 // M3 821 mov f48=f0 // F 822 823 ldfps f49,f50=[sp] // M0 824 ldfps f51,f52=[sp] // M1 825 mov f53=f0 // F 826 827 setf.s f54=r0 // M2 828 setf.s f55=r0 // M3 829 mov f56=f0 // F 830 831 ldfps f57,f58=[sp] // M0 832 ldfps f59,f60=[sp] // M1 833 mov f61=f0 // F 834 835 setf.s f62=r0 // M2 836 setf.s f63=r0 // M3 837 mov f64=f0 // F 838 839 ldfps f65,f66=[sp] // M0 840 ldfps f67,f68=[sp] // M1 841 mov f69=f0 // F 842 843 setf.s f70=r0 // M2 844 setf.s f71=r0 // M3 845 mov f72=f0 // F 846 847 ldfps f73,f74=[sp] // M0 848 ldfps f75,f76=[sp] // M1 849 mov f77=f0 // F 850 851 setf.s f78=r0 // M2 852 setf.s f79=r0 // M3 853 mov f80=f0 // F 854 855 ldfps f81,f82=[sp] // M0 856 ldfps f83,f84=[sp] // M1 857 mov f85=f0 // F 858 859 setf.s f86=r0 // M2 860 setf.s f87=r0 // M3 861 mov f88=f0 // F 862 863 /* 864 * When the instructions are cached, it would be faster to initialize 865 * the remaining registers with simply mov instructions (F-unit). 866 * This gets the time down to ~29 cycles. However, this would use up 867 * 33 bundles, whereas continuing with the above pattern yields 868 * 10 bundles and ~30 cycles. 869 */ 870 871 ldfps f89,f90=[sp] // M0 872 ldfps f91,f92=[sp] // M1 873 mov f93=f0 // F 874 875 setf.s f94=r0 // M2 876 setf.s f95=r0 // M3 877 mov f96=f0 // F 878 879 ldfps f97,f98=[sp] // M0 880 ldfps f99,f100=[sp] // M1 881 mov f101=f0 // F 882 883 setf.s f102=r0 // M2 884 setf.s f103=r0 // M3 885 mov f104=f0 // F 886 887 ldfps f105,f106=[sp] // M0 888 ldfps f107,f108=[sp] // M1 889 mov f109=f0 // F 890 891 setf.s f110=r0 // M2 892 setf.s f111=r0 // M3 893 mov f112=f0 // F 894 895 ldfps f113,f114=[sp] // M0 896 ldfps f115,f116=[sp] // M1 897 mov f117=f0 // F 898 899 setf.s f118=r0 // M2 900 setf.s f119=r0 // M3 901 mov f120=f0 // F 902 903 ldfps f121,f122=[sp] // M0 904 ldfps f123,f124=[sp] // M1 905 mov f125=f0 // F 906 907 setf.s f126=r0 // M2 908 setf.s f127=r0 // M3 909 br.ret.sptk.many rp // F 910END(__ia64_init_fpu) 911 912/* 913 * Switch execution mode from virtual to physical 914 * 915 * Inputs: 916 * r16 = new psr to establish 917 * Output: 918 * r19 = old virtual address of ar.bsp 919 * r20 = old virtual address of sp 920 * 921 * Note: RSE must already be in enforced lazy mode 922 */ 923GLOBAL_ENTRY(ia64_switch_mode_phys) 924 { 925 rsm psr.i | psr.ic // disable interrupts and interrupt collection 926 mov r15=ip 927 } 928 ;; 929 { 930 flushrs // must be first insn in group 931 srlz.i 932 } 933 ;; 934 mov cr.ipsr=r16 // set new PSR 935 add r3=1f-ia64_switch_mode_phys,r15 936 937 mov r19=ar.bsp 938 mov r20=sp 939 mov r14=rp // get return address into a general register 940 ;; 941 942 // going to physical mode, use tpa to translate virt->phys 943 tpa r17=r19 944 tpa r3=r3 945 tpa sp=sp 946 tpa r14=r14 947 ;; 948 949 mov r18=ar.rnat // save ar.rnat 950 mov ar.bspstore=r17 // this steps on ar.rnat 951 mov cr.iip=r3 952 mov cr.ifs=r0 953 ;; 954 mov ar.rnat=r18 // restore ar.rnat 955 rfi // must be last insn in group 956 ;; 9571: mov rp=r14 958 br.ret.sptk.many rp 959END(ia64_switch_mode_phys) 960 961/* 962 * Switch execution mode from physical to virtual 963 * 964 * Inputs: 965 * r16 = new psr to establish 966 * r19 = new bspstore to establish 967 * r20 = new sp to establish 968 * 969 * Note: RSE must already be in enforced lazy mode 970 */ 971GLOBAL_ENTRY(ia64_switch_mode_virt) 972 { 973 rsm psr.i | psr.ic // disable interrupts and interrupt collection 974 mov r15=ip 975 } 976 ;; 977 { 978 flushrs // must be first insn in group 979 srlz.i 980 } 981 ;; 982 mov cr.ipsr=r16 // set new PSR 983 add r3=1f-ia64_switch_mode_virt,r15 984 985 mov r14=rp // get return address into a general register 986 ;; 987 988 // going to virtual 989 // - for code addresses, set upper bits of addr to KERNEL_START 990 // - for stack addresses, copy from input argument 991 movl r18=KERNEL_START 992 dep r3=0,r3,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT 993 dep r14=0,r14,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT 994 mov sp=r20 995 ;; 996 or r3=r3,r18 997 or r14=r14,r18 998 ;; 999 1000 mov r18=ar.rnat // save ar.rnat 1001 mov ar.bspstore=r19 // this steps on ar.rnat 1002 mov cr.iip=r3 1003 mov cr.ifs=r0 1004 ;; 1005 mov ar.rnat=r18 // restore ar.rnat 1006 rfi // must be last insn in group 1007 ;; 10081: mov rp=r14 1009 br.ret.sptk.many rp 1010END(ia64_switch_mode_virt) 1011 1012GLOBAL_ENTRY(ia64_delay_loop) 1013 .prologue 1014{ nop 0 // work around GAS unwind info generation bug... 1015 .save ar.lc,r2 1016 mov r2=ar.lc 1017 .body 1018 ;; 1019 mov ar.lc=r32 1020} 1021 ;; 1022 // force loop to be 32-byte aligned (GAS bug means we cannot use .align 1023 // inside function body without corrupting unwind info). 1024{ nop 0 } 10251: br.cloop.sptk.few 1b 1026 ;; 1027 mov ar.lc=r2 1028 br.ret.sptk.many rp 1029END(ia64_delay_loop) 1030 1031/* 1032 * Return a CPU-local timestamp in nano-seconds. This timestamp is 1033 * NOT synchronized across CPUs its return value must never be 1034 * compared against the values returned on another CPU. The usage in 1035 * kernel/sched/core.c ensures that. 1036 * 1037 * The return-value of sched_clock() is NOT supposed to wrap-around. 1038 * If it did, it would cause some scheduling hiccups (at the worst). 1039 * Fortunately, with a 64-bit cycle-counter ticking at 100GHz, even 1040 * that would happen only once every 5+ years. 1041 * 1042 * The code below basically calculates: 1043 * 1044 * (ia64_get_itc() * local_cpu_data->nsec_per_cyc) >> IA64_NSEC_PER_CYC_SHIFT 1045 * 1046 * except that the multiplication and the shift are done with 128-bit 1047 * intermediate precision so that we can produce a full 64-bit result. 1048 */ 1049GLOBAL_ENTRY(ia64_native_sched_clock) 1050 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0 1051 mov.m r9=ar.itc // fetch cycle-counter (35 cyc) 1052 ;; 1053 ldf8 f8=[r8] 1054 ;; 1055 setf.sig f9=r9 // certain to stall, so issue it _after_ ldf8... 1056 ;; 1057 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc) 1058 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product 1059 ;; 1060 getf.sig r8=f10 // (5 cyc) 1061 getf.sig r9=f11 1062 ;; 1063 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT 1064 br.ret.sptk.many rp 1065END(ia64_native_sched_clock) 1066#ifndef CONFIG_PARAVIRT 1067 //unsigned long long 1068 //sched_clock(void) __attribute__((alias("ia64_native_sched_clock"))); 1069 .global sched_clock 1070sched_clock = ia64_native_sched_clock 1071#endif 1072 1073#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 1074GLOBAL_ENTRY(cycle_to_cputime) 1075 alloc r16=ar.pfs,1,0,0,0 1076 addl r8=THIS_CPU(ia64_cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0 1077 ;; 1078 ldf8 f8=[r8] 1079 ;; 1080 setf.sig f9=r32 1081 ;; 1082 xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc) 1083 xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product 1084 ;; 1085 getf.sig r8=f10 // (5 cyc) 1086 getf.sig r9=f11 1087 ;; 1088 shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT 1089 br.ret.sptk.many rp 1090END(cycle_to_cputime) 1091#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 1092 1093#ifdef CONFIG_IA64_BRL_EMU 1094 1095/* 1096 * Assembly routines used by brl_emu.c to set preserved register state. 1097 */ 1098 1099#define SET_REG(reg) \ 1100 GLOBAL_ENTRY(ia64_set_##reg); \ 1101 alloc r16=ar.pfs,1,0,0,0; \ 1102 mov reg=r32; \ 1103 ;; \ 1104 br.ret.sptk.many rp; \ 1105 END(ia64_set_##reg) 1106 1107SET_REG(b1); 1108SET_REG(b2); 1109SET_REG(b3); 1110SET_REG(b4); 1111SET_REG(b5); 1112 1113#endif /* CONFIG_IA64_BRL_EMU */ 1114 1115#ifdef CONFIG_SMP 1116 1117#ifdef CONFIG_HOTPLUG_CPU 1118GLOBAL_ENTRY(ia64_jump_to_sal) 1119 alloc r16=ar.pfs,1,0,0,0;; 1120 rsm psr.i | psr.ic 1121{ 1122 flushrs 1123 srlz.i 1124} 1125 tpa r25=in0 1126 movl r18=tlb_purge_done;; 1127 DATA_VA_TO_PA(r18);; 1128 mov b1=r18 // Return location 1129 movl r18=ia64_do_tlb_purge;; 1130 DATA_VA_TO_PA(r18);; 1131 mov b2=r18 // doing tlb_flush work 1132 mov ar.rsc=0 // Put RSE in enforced lazy, LE mode 1133 movl r17=1f;; 1134 DATA_VA_TO_PA(r17);; 1135 mov cr.iip=r17 1136 movl r16=SAL_PSR_BITS_TO_SET;; 1137 mov cr.ipsr=r16 1138 mov cr.ifs=r0;; 1139 rfi;; // note: this unmask MCA/INIT (psr.mc) 11401: 1141 /* 1142 * Invalidate all TLB data/inst 1143 */ 1144 br.sptk.many b2;; // jump to tlb purge code 1145 1146tlb_purge_done: 1147 RESTORE_REGION_REGS(r25, r17,r18,r19);; 1148 RESTORE_REG(b0, r25, r17);; 1149 RESTORE_REG(b1, r25, r17);; 1150 RESTORE_REG(b2, r25, r17);; 1151 RESTORE_REG(b3, r25, r17);; 1152 RESTORE_REG(b4, r25, r17);; 1153 RESTORE_REG(b5, r25, r17);; 1154 ld8 r1=[r25],0x08;; 1155 ld8 r12=[r25],0x08;; 1156 ld8 r13=[r25],0x08;; 1157 RESTORE_REG(ar.fpsr, r25, r17);; 1158 RESTORE_REG(ar.pfs, r25, r17);; 1159 RESTORE_REG(ar.rnat, r25, r17);; 1160 RESTORE_REG(ar.unat, r25, r17);; 1161 RESTORE_REG(ar.bspstore, r25, r17);; 1162 RESTORE_REG(cr.dcr, r25, r17);; 1163 RESTORE_REG(cr.iva, r25, r17);; 1164 RESTORE_REG(cr.pta, r25, r17);; 1165 srlz.d;; // required not to violate RAW dependency 1166 RESTORE_REG(cr.itv, r25, r17);; 1167 RESTORE_REG(cr.pmv, r25, r17);; 1168 RESTORE_REG(cr.cmcv, r25, r17);; 1169 RESTORE_REG(cr.lrr0, r25, r17);; 1170 RESTORE_REG(cr.lrr1, r25, r17);; 1171 ld8 r4=[r25],0x08;; 1172 ld8 r5=[r25],0x08;; 1173 ld8 r6=[r25],0x08;; 1174 ld8 r7=[r25],0x08;; 1175 ld8 r17=[r25],0x08;; 1176 mov pr=r17,-1;; 1177 RESTORE_REG(ar.lc, r25, r17);; 1178 /* 1179 * Now Restore floating point regs 1180 */ 1181 ldf.fill.nta f2=[r25],16;; 1182 ldf.fill.nta f3=[r25],16;; 1183 ldf.fill.nta f4=[r25],16;; 1184 ldf.fill.nta f5=[r25],16;; 1185 ldf.fill.nta f16=[r25],16;; 1186 ldf.fill.nta f17=[r25],16;; 1187 ldf.fill.nta f18=[r25],16;; 1188 ldf.fill.nta f19=[r25],16;; 1189 ldf.fill.nta f20=[r25],16;; 1190 ldf.fill.nta f21=[r25],16;; 1191 ldf.fill.nta f22=[r25],16;; 1192 ldf.fill.nta f23=[r25],16;; 1193 ldf.fill.nta f24=[r25],16;; 1194 ldf.fill.nta f25=[r25],16;; 1195 ldf.fill.nta f26=[r25],16;; 1196 ldf.fill.nta f27=[r25],16;; 1197 ldf.fill.nta f28=[r25],16;; 1198 ldf.fill.nta f29=[r25],16;; 1199 ldf.fill.nta f30=[r25],16;; 1200 ldf.fill.nta f31=[r25],16;; 1201 1202 /* 1203 * Now that we have done all the register restores 1204 * we are now ready for the big DIVE to SAL Land 1205 */ 1206 ssm psr.ic;; 1207 srlz.d;; 1208 br.ret.sptk.many b0;; 1209END(ia64_jump_to_sal) 1210#endif /* CONFIG_HOTPLUG_CPU */ 1211 1212#endif /* CONFIG_SMP */ 1213