[apple/xnu.git] / osfmk / ppc / AltiAssist.s

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* 																							
 	AltiAssist.s 

	Do the VMX assists

	Lovingly crafted by Bill Angell using traditional methods and only natural or recycled materials.
	No animal products are used other than rendered otter bile and deep fried pork lard.

*/

#include <cpus.h>
#include <ppc/asm.h>
#include <ppc/proc_reg.h>
#include <ppc/exception.h>
#include <mach/machine/vm_param.h>
#include <assym.s>

;
;
;			General stuff what happens here:
;				1)	All general context saved, interrupts off, translation off
;				2)	Vector and floating point disabled, but there may be live context.
;					This code is responsible for saving and restoring what is used. This
;					includes exception states, java mode, etc.
;				3)	No attempt is made to resolve page faults.  PTE misses are handled
;					automatically, but actual faults (ala copyin/copyout) are not. If 
;					a fault does occur, the exception that caused entry to the emulation
;					routine is remapped to either an instruction or data miss (depending
;					upon the stage detected) and redriven through the exception handler.
;					The only time that an instruction fault can happen is when a different
;					processor removes a mapping between our original fault and when we
;					fetch the assisted instruction. For an assisted instruction, data
;					faults should not occur (except in the MP case).  For a purely
;					emulated instruction, faults can occur.
;
;			Emulation algorithms cloned from MacOS 9 code.
;
;			Assumes that R2 = per_proc_area
;
;


			.align	5
			.globl	EXT(AltivecAssist)

LEXT(AltivecAssist)

			li			r10,emvr0					; Point to the vector savearea
			
			li			r11,emvr1					; Another savearea
			stvxl		v0,r10,r2					; Save V0
			stvxl		v1,r11,r2					; Save V1
			vspltisw	v0,1						; Set a 1 in V0			
			vspltisw	v1,8						; Get half of the shift
			vslw		v0,v0,v1					; Shift half way
			vslw		v0,v0,v1					; Shift the rest of the way (we now have 0x00010000)
			mfvscr		v1							; Get the VSCR
			vor			v1,v1,v0					; Turn off Java mode
			lvxl		v0,r10,r2					; Restore V0
			mtvscr		v1							; Set Java mode off
			lvxl		v1,r11,r2					; Restore V1
			
			li			r11,T_IN_VAIN				; We are all done
			b			EXT(EmulExit)				; We are done, no tracing on...
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	AltiAssist.s
	27
	28	Do the VMX assists
	29
	30	Lovingly crafted by Bill Angell using traditional methods and only natural or recycled materials.
	31	No animal products are used other than rendered otter bile and deep fried pork lard.
	32
	33	*/
	34
	35	#include <cpus.h>
	36	#include <ppc/asm.h>
	37	#include <ppc/proc_reg.h>
	38	#include <ppc/exception.h>
	39	#include <mach/machine/vm_param.h>
	40	#include <assym.s>
	41
	42	;
	43	;
	44	; General stuff what happens here:
	45	; 1) All general context saved, interrupts off, translation off
	46	; 2) Vector and floating point disabled, but there may be live context.
	47	; This code is responsible for saving and restoring what is used. This
	48	; includes exception states, java mode, etc.
	49	; 3) No attempt is made to resolve page faults. PTE misses are handled
	50	; automatically, but actual faults (ala copyin/copyout) are not. If
	51	; a fault does occur, the exception that caused entry to the emulation
	52	; routine is remapped to either an instruction or data miss (depending
	53	; upon the stage detected) and redriven through the exception handler.
	54	; The only time that an instruction fault can happen is when a different
	55	; processor removes a mapping between our original fault and when we
	56	; fetch the assisted instruction. For an assisted instruction, data
	57	; faults should not occur (except in the MP case). For a purely
	58	; emulated instruction, faults can occur.
	59	;
	60	; Emulation algorithms cloned from MacOS 9 code.
	61	;
	62	; Assumes that R2 = per_proc_area
	63	;
	64	;
	65
	66
	67	.align 5
	68	.globl EXT(AltivecAssist)
	69
	70	LEXT(AltivecAssist)
	71
1c79356b	72	li r10,emvr0 ; Point to the vector savearea
1c79356b A	73
	74	li r11,emvr1 ; Another savearea
	75	stvxl v0,r10,r2 ; Save V0
	76	stvxl v1,r11,r2 ; Save V1
	77	vspltisw v0,1 ; Set a 1 in V0
	78	vspltisw v1,8 ; Get half of the shift
	79	vslw v0,v0,v1 ; Shift half way
	80	vslw v0,v0,v1 ; Shift the rest of the way (we now have 0x00010000)
	81	mfvscr v1 ; Get the VSCR
	82	vor v1,v1,v0 ; Turn off Java mode
	83	lvxl v0,r10,r2 ; Restore V0
	84	mtvscr v1 ; Set Java mode off
	85	lvxl v1,r11,r2 ; Restore V1
	86
	87	li r11,T_IN_VAIN ; We are all done
	88	b EXT(EmulExit) ; We are done, no tracing on...
	89
	90
	91
	92