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	1	/*
	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*
	29	AltiAssist.s
	30
	31	Do the VMX assists
	32
	33	Lovingly crafted by Bill Angell using traditional methods and only natural or recycled materials.
	34	No animal products are used other than rendered otter bile and deep fried pork lard.
	35
	36	*/
	37
	38	#include <ppc/asm.h>
	39	#include <ppc/proc_reg.h>
	40	#include <ppc/exception.h>
	41	#include <mach/machine/vm_param.h>
	42	#include <assym.s>
	43
	44	;
	45	;
	46	; General stuff what happens here:
	47	; 1) All general context saved, interrupts off, translation off
	48	; 2) Vector and floating point disabled, but there may be live context.
	49	; This code is responsible for saving and restoring what is used. This
	50	; includes exception states, java mode, etc.
	51	; 3) No attempt is made to resolve page faults. PTE misses are handled
	52	; automatically, but actual faults (ala copyin/copyout) are not. If
	53	; a fault does occur, the exception that caused entry to the emulation
	54	; routine is remapped to either an instruction or data miss (depending
	55	; upon the stage detected) and redriven through the exception handler.
	56	; The only time that an instruction fault can happen is when a different
	57	; processor removes a mapping between our original fault and when we
	58	; fetch the assisted instruction. For an assisted instruction, data
	59	; faults should not occur (except in the MP case). For a purely
	60	; emulated instruction, faults can occur.
	61	;
	62	; Emulation algorithms cloned from MacOS 9 code.
	63	;
	64	; Assumes that R2 = per_proc_area
	65	;
	66	;
	67
	68
	69	.align 5
	70	.globl EXT(AltivecAssist)
	71
	72	LEXT(AltivecAssist)
	73
	74	li r10,emvr0 ; Point to the vector savearea
	75
	76	li r11,emvr1 ; Another savearea
	77	stvxl v0,r10,r2 ; Save V0
	78	stvxl v1,r11,r2 ; Save V1
	79	vspltisw v0,1 ; Set a 1 in V0
	80	vspltisw v1,8 ; Get half of the shift
	81	vslw v0,v0,v1 ; Shift half way
	82	vslw v0,v0,v1 ; Shift the rest of the way (we now have 0x00010000)
	83	mfvscr v1 ; Get the VSCR
	84	vor v1,v1,v0 ; Turn off Java mode
	85	lvxl v0,r10,r2 ; Restore V0
	86	mtvscr v1 ; Set Java mode off
	87	lvxl v1,r11,r2 ; Restore V1
	88
	89	li r11,T_IN_VAIN ; We are all done
	90	b EXT(EmulExit) ; We are done, no tracing on...
	91