[apple/xnu.git] / osfmk / i386 / commpage / cacheflush.s

/*
 * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * 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. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * 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_OSREFERENCE_LICENSE_HEADER_END@
 */

#include <machine/cpu_capabilities.h>
#include <machine/commpage.h>

        .text
        .align  2, 0x90

// void sysFlushDcache( void *p, size_t len );
// 32-bit version

Lsys_flush_dcache:
	movl	8(%esp),%ecx		// get length
	movl	4(%esp),%edx		// get ptr
	testl	%ecx,%ecx		// length 0?
	jz	2f			// yes
	mfence				// ensure previous stores make it to memory
	clflush	-1(%edx,%ecx)		// make sure last line is flushed
1:
	clflush	(%edx)			// flush a line
	addl	$64,%edx
	subl	$64,%ecx
	ja	1b
	mfence				// make sure memory is updated before we return
2:
	ret

	COMMPAGE_DESCRIPTOR(sys_flush_dcache,_COMM_PAGE_FLUSH_DCACHE,kCache64,0)


// void sysFlushDcache( void *p, size_t len );
// 64-bit version
	.code64
Lsys_flush_dcache_64:			// %rdi = ptr,  %rsi = length
	testq	%rsi,%rsi		// length 0?
	jz	2f			// yes
	mfence				// ensure previous stores make it to memory
	clflush	-1(%rdi,%rsi)		// make sure last line is flushed
1:
	clflush	(%rdi)			// flush a line
	addq	$64,%rdi
	subq	$64,%rsi
	ja	1b
	mfence				// make sure memory is updated before we return
2:
	ret
	.code32
	COMMPAGE_DESCRIPTOR(sys_flush_dcache_64,_COMM_PAGE_FLUSH_DCACHE,kCache64,0)


// void sysIcacheInvalidate( void *p, size_t len );

Lsys_icache_invalidate:
	// This is a NOP on intel processors, since the intent of the API
	// is to make data executable, and Intel L1Is are coherent with L1D.
	// We can use same routine both in 32 and 64-bit mode, since it is
	// just a RET instruction.
	ret

	COMMPAGE_DESCRIPTOR(sys_icache_invalidate,_COMM_PAGE_FLUSH_ICACHE,0,0)
Commit	Line	Data
de355530	1	/*
0c530ab8	2	* Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
de355530	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
de355530	5	*
2d21ac55 A	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.
8f6c56a5	14	*
2d21ac55 A	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	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.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
de355530	27	*/
de355530	28
55e303ae A	29	#include <machine/cpu_capabilities.h>
	30	#include <machine/commpage.h>
	31
	32	.text
	33	.align 2, 0x90
	34
0c530ab8 A	35	// void sysFlushDcache( void *p, size_t len );
	36	// 32-bit version
	37
55e303ae	38	Lsys_flush_dcache:
2d21ac55 A	39	movl 8(%esp),%ecx // get length
2d21ac55 A	40	movl 4(%esp),%edx // get ptr
0c530ab8 A	41	testl %ecx,%ecx // length 0?
	42	jz 2f // yes
	43	mfence // ensure previous stores make it to memory
2d21ac55	44	clflush -1(%edx,%ecx) // make sure last line is flushed
0c530ab8 A	45	1:
	46	clflush (%edx) // flush a line
	47	addl $64,%edx
	48	subl $64,%ecx
2d21ac55	49	ja 1b
0c530ab8 A	50	mfence // make sure memory is updated before we return
	51	2:
	52	ret
	53
	54	COMMPAGE_DESCRIPTOR(sys_flush_dcache,_COMM_PAGE_FLUSH_DCACHE,kCache64,0)
	55
	56
	57	// void sysFlushDcache( void *p, size_t len );
	58	// 64-bit version
	59	.code64
	60	Lsys_flush_dcache_64: // %rdi = ptr, %rsi = length
	61	testq %rsi,%rsi // length 0?
	62	jz 2f // yes
	63	mfence // ensure previous stores make it to memory
2d21ac55	64	clflush -1(%rdi,%rsi) // make sure last line is flushed
0c530ab8 A	65	1:
	66	clflush (%rdi) // flush a line
	67	addq $64,%rdi
	68	subq $64,%rsi
2d21ac55	69	ja 1b
0c530ab8 A	70	mfence // make sure memory is updated before we return
0c530ab8 A	71	2:
4452a7af	72	ret
0c530ab8 A	73	.code32
	74	COMMPAGE_DESCRIPTOR(sys_flush_dcache_64,_COMM_PAGE_FLUSH_DCACHE,kCache64,0)
	75
4452a7af	76
0c530ab8	77	// void sysIcacheInvalidate( void *p, size_t len );
55e303ae A	78
55e303ae A	79	Lsys_icache_invalidate:
0c530ab8 A	80	// This is a NOP on intel processors, since the intent of the API
	81	// is to make data executable, and Intel L1Is are coherent with L1D.
	82	// We can use same routine both in 32 and 64-bit mode, since it is
	83	// just a RET instruction.
55e303ae A	84	ret
	85
	86	COMMPAGE_DESCRIPTOR(sys_icache_invalidate,_COMM_PAGE_FLUSH_ICACHE,0,0)