misc_64.S (521c180874dae86f675d23c4eade4dba8b1f2cc8) misc_64.S (e821ea70f3b4873b50056a1e0f74befed1014c09)
1/*
2 * This file contains miscellaneous low-level functions.
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
6 * and Paul Mackerras.
7 * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
8 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)

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452_GLOBAL(disable_kernel_fp)
453 mfmsr r3
454 rldicl r0,r3,(63-MSR_FP_LG),1
455 rldicl r3,r0,(MSR_FP_LG+1),0
456 mtmsrd r3 /* disable use of fpu now */
457 isync
458 blr
459
1/*
2 * This file contains miscellaneous low-level functions.
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
6 * and Paul Mackerras.
7 * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
8 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)

--- 443 unchanged lines hidden (view full) ---

452_GLOBAL(disable_kernel_fp)
453 mfmsr r3
454 rldicl r0,r3,(63-MSR_FP_LG),1
455 rldicl r3,r0,(MSR_FP_LG+1),0
456 mtmsrd r3 /* disable use of fpu now */
457 isync
458 blr
459
460#ifdef CONFIG_ALTIVEC
461
462#if 0 /* this has no callers for now */
463/*
464 * disable_kernel_altivec()
465 * Disable the VMX.
466 */
467_GLOBAL(disable_kernel_altivec)
468 mfmsr r3
469 rldicl r0,r3,(63-MSR_VEC_LG),1
470 rldicl r3,r0,(MSR_VEC_LG+1),0
471 mtmsrd r3 /* disable use of VMX now */
472 isync
473 blr
474#endif /* 0 */
475
476/*
477 * giveup_altivec(tsk)
478 * Disable VMX for the task given as the argument,
479 * and save the vector registers in its thread_struct.
480 * Enables the VMX for use in the kernel on return.
481 */
482_GLOBAL(giveup_altivec)
483 mfmsr r5
484 oris r5,r5,MSR_VEC@h
485 mtmsrd r5 /* enable use of VMX now */
486 isync
487 cmpdi 0,r3,0
488 beqlr- /* if no previous owner, done */
489 addi r3,r3,THREAD /* want THREAD of task */
490 ld r5,PT_REGS(r3)
491 cmpdi 0,r5,0
492 SAVE_32VRS(0,r4,r3)
493 mfvscr vr0
494 li r4,THREAD_VSCR
495 stvx vr0,r4,r3
496 beq 1f
497 ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
498#ifdef CONFIG_VSX
499BEGIN_FTR_SECTION
500 lis r3,(MSR_VEC|MSR_VSX)@h
501FTR_SECTION_ELSE
502 lis r3,MSR_VEC@h
503ALT_FTR_SECTION_END_IFSET(CPU_FTR_VSX)
504#else
505 lis r3,MSR_VEC@h
506#endif
507 andc r4,r4,r3 /* disable FP for previous task */
508 std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
5091:
510#ifndef CONFIG_SMP
511 li r5,0
512 ld r4,last_task_used_altivec@got(r2)
513 std r5,0(r4)
514#endif /* CONFIG_SMP */
515 blr
516
517#endif /* CONFIG_ALTIVEC */
518
519#ifdef CONFIG_VSX
520/*
521 * __giveup_vsx(tsk)
522 * Disable VSX for the task given as the argument.
523 * Does NOT save vsx registers.
524 * Enables the VSX for use in the kernel on return.
525 */
526_GLOBAL(__giveup_vsx)
527 mfmsr r5
528 oris r5,r5,MSR_VSX@h
529 mtmsrd r5 /* enable use of VSX now */
530 isync
531
532 cmpdi 0,r3,0
533 beqlr- /* if no previous owner, done */
534 addi r3,r3,THREAD /* want THREAD of task */
535 ld r5,PT_REGS(r3)
536 cmpdi 0,r5,0
537 beq 1f
538 ld r4,_MSR-STACK_FRAME_OVERHEAD(r5)
539 lis r3,MSR_VSX@h
540 andc r4,r4,r3 /* disable VSX for previous task */
541 std r4,_MSR-STACK_FRAME_OVERHEAD(r5)
5421:
543#ifndef CONFIG_SMP
544 li r5,0
545 ld r4,last_task_used_vsx@got(r2)
546 std r5,0(r4)
547#endif /* CONFIG_SMP */
548 blr
549
550#endif /* CONFIG_VSX */
551
552/* kexec_wait(phys_cpu)
553 *
554 * wait for the flag to change, indicating this kernel is going away but
555 * the slave code for the next one is at addresses 0 to 100.
556 *
557 * This is used by all slaves.
558 *
559 * Physical (hardware) cpu id should be in r3.

--- 162 unchanged lines hidden --- 		460/* kexec_wait(phys_cpu)
461 *
462 * wait for the flag to change, indicating this kernel is going away but
463 * the slave code for the next one is at addresses 0 to 100.
464 *
465 * This is used by all slaves.
466 *
467 * Physical (hardware) cpu id should be in r3.

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