| swtch.s (210617) | swtch.s (235622) |
|---|---|
| 1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 15 unchanged lines hidden (view full) --- 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * | 1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 15 unchanged lines hidden (view full) --- 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * |
| 32 * $FreeBSD: head/sys/i386/i386/swtch.s 210617 2010-07-29 17:00:41Z jkim $ | 32 * $FreeBSD: head/sys/i386/i386/swtch.s 235622 2012-05-18 18:55:58Z iwasaki $ |
| 33 */ 34 35#include "opt_npx.h" 36#include "opt_sched.h" 37 38#include <machine/asmacros.h> 39 40#include "assym.s" --- 381 unchanged lines hidden (view full) --- 422 call bcopy 423 addl $12,%esp 4241: 425 popfl 426#endif /* DEV_NPX */ 427 428 ret 429END(savectx) | 33 */ 34 35#include "opt_npx.h" 36#include "opt_sched.h" 37 38#include <machine/asmacros.h> 39 40#include "assym.s" --- 381 unchanged lines hidden (view full) --- 422 call bcopy 423 addl $12,%esp 4241: 425 popfl 426#endif /* DEV_NPX */ 427 428 ret 429END(savectx) |
| 430 431/* 432 * suspendctx(pcb) 433 * Update pcb, suspending current processor state. 434 */ 435ENTRY(suspendctx) 436 /* Fetch PCB. */ 437 movl 4(%esp),%ecx 438 439 /* Save context by calling savectx(). */ 440 pushl %ecx 441 call savectx 442 addl $4,%esp 443 444 /* Fetch PCB again. */ 445 movl 4(%esp),%ecx 446 447 /* Update caller's return address and stack pointer. */ 448 movl (%esp),%eax 449 movl %eax,PCB_EIP(%ecx) 450 movl %esp,PCB_ESP(%ecx) 451 452 /* Save other registers and descriptor tables. */ 453 movl %cr0,%eax 454 movl %eax,PCB_CR0(%ecx) 455 movl %cr2,%eax 456 movl %eax,PCB_CR2(%ecx) 457 movl %cr4,%eax 458 movl %eax,PCB_CR4(%ecx) 459 460 movl %dr0,%eax 461 movl %eax,PCB_DR0(%ecx) 462 movl %dr1,%eax 463 movl %eax,PCB_DR1(%ecx) 464 movl %dr2,%eax 465 movl %eax,PCB_DR2(%ecx) 466 movl %dr3,%eax 467 movl %eax,PCB_DR3(%ecx) 468 movl %dr6,%eax 469 movl %eax,PCB_DR6(%ecx) 470 movl %dr7,%eax 471 movl %eax,PCB_DR7(%ecx) 472 473 mov %ds,PCB_DS(%ecx) 474 mov %es,PCB_ES(%ecx) 475 mov %fs,PCB_FS(%ecx) 476 mov %ss,PCB_SS(%ecx) 477 478 sgdt PCB_GDT(%ecx) 479 sidt PCB_IDT(%ecx) 480 sldt PCB_LDT(%ecx) 481 str PCB_TR(%ecx) 482 483 movl $1,%eax 484 ret 485END(suspendctx) 486 487/* 488 * resumectx(pcb in %esi) 489 * Resuming processor state from pcb. 490 */ 491ENTRY(resumectx) 492 /* Fetch PCB. */ 493 movl %esi,%ecx 494 495 /* Restore GDT. */ 496 lgdt PCB_GDT(%ecx) 497 498 /* Restore segment registers */ 499 movzwl PCB_DS(%ecx),%eax 500 mov %ax,%ds 501 movzwl PCB_ES(%ecx),%eax 502 mov %ax,%es 503 movzwl PCB_FS(%ecx),%eax 504 mov %ax,%fs 505 movzwl PCB_GS(%ecx),%eax 506 movw %ax,%gs 507 movzwl PCB_SS(%ecx),%eax 508 mov %ax,%ss 509 510 /* Restore CR2, CR4, CR3 and CR0 */ 511 movl PCB_CR2(%ecx),%eax 512 movl %eax,%cr2 513 movl PCB_CR4(%ecx),%eax 514 movl %eax,%cr4 515 movl PCB_CR3(%ecx),%eax 516 movl %eax,%cr3 517 movl PCB_CR0(%ecx),%eax 518 movl %eax,%cr0 519 jmp 1f 5201: 521 522 /* Restore descriptor tables */ 523 lidt PCB_IDT(%ecx) 524 lldt PCB_LDT(%ecx) 525 526#define SDT_SYS386TSS 9 527#define SDT_SYS386BSY 11 528 /* Clear "task busy" bit and reload TR */ 529 movl PCPU(TSS_GDT),%eax 530 andb $(~SDT_SYS386BSY | SDT_SYS386TSS),5(%eax) 531 movzwl PCB_TR(%ecx),%eax 532 ltr %ax 533#undef SDT_SYS386TSS 534#undef SDT_SYS386BSY 535 536 /* Restore debug registers */ 537 movl PCB_DR0(%ecx),%eax 538 movl %eax,%dr0 539 movl PCB_DR1(%ecx),%eax 540 movl %eax,%dr1 541 movl PCB_DR2(%ecx),%eax 542 movl %eax,%dr2 543 movl PCB_DR3(%ecx),%eax 544 movl %eax,%dr3 545 movl PCB_DR6(%ecx),%eax 546 movl %eax,%dr6 547 movl PCB_DR7(%ecx),%eax 548 movl %eax,%dr7 549 550#ifdef DEV_NPX 551 /* XXX FIX ME */ 552#endif 553 554 /* Restore other registers */ 555 movl PCB_EDI(%ecx),%edi 556 movl PCB_ESI(%ecx),%esi 557 movl PCB_EBP(%ecx),%ebp 558 movl PCB_ESP(%ecx),%esp 559 movl PCB_EBX(%ecx),%ebx 560 561 /* reload code selector by turning return into intersegmental return */ 562 pushl PCB_EIP(%ecx) 563 movl $KCSEL,4(%esp) 564 xorl %eax,%eax 565 lret 566END(resumectx) |
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