[apple/xnu.git] / osfmk / i386 / cpu_number.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

/*
 */

/*
 *	Machine-dependent definitions for cpu identification.
 *
 */
#ifndef	_I386_CPU_NUMBER_H_
#define	_I386_CPU_NUMBER_H_

#include <sys/appleapiopts.h>

#ifdef __APPLE_API_UNSTABLE
extern int	cpu_number(void);

#ifdef MACH_KERNEL_PRIVATE

#include <platforms.h>
#include <cpus.h>

#include <mp_v1_1.h>

#if	MP_V1_1
#include <i386/apic.h>
#include <i386/asm.h>

extern int lapic_id;

extern __inline__ int cpu_number(void)
{
	register int cpu;

	__asm__ volatile ("movl " CC_SYM_PREFIX "lapic_id, %0\n"
			  "	movl 0(%0), %0\n"
			  "	shrl %1, %0\n"
			  "	andl %2, %0"
		    : "=r" (cpu)
		    : "i" (LAPIC_ID_SHIFT), "i" (LAPIC_ID_MASK));

	return(cpu);
}
#else	/* MP_V1_1 */
/*
 * At least one corollary cpu type does not have local memory at all.
 * The only way I found to store the cpu number was in some 386/486
 * system register. cr3 has bits 0, 1, 2 and 5, 6, 7, 8, 9, 10, 11
 * available. Right now we use 0, 1 and 2. So we are limited to 8 cpus.
 * For more cpus, we could use bits 5 - 11 with a shift.
 *
 * Even for other machines, like COMPAQ this is much faster the inb/outb
 * 4 cycles instead of 10 to 30.
 */
#if	defined(__GNUC__)
#if	NCPUS	> 8
#error	cpu_number() definition only works for #cpus <= 8
#else

extern __inline__ int cpu_number(void)
{
	register int cpu;

	__asm__ volatile ("movl %%cr3, %0\n"
		"	andl $0x7, %0"
		    : "=r" (cpu));
	return(cpu);
}
#endif
#endif	/* defined(__GNUC__) */

#endif	/* MP_V1_1 */

#endif	/* MACH_KERNEL_PRIVATE */

#endif  /* __APPLE_API_UNSTABLE */

#endif	/* _I386_CPU_NUMBER_H_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* @OSF_COPYRIGHT@
	24	*/
	25	/*
	26	* Mach Operating System
	27	* Copyright (c) 1991,1990 Carnegie Mellon University
	28	* All Rights Reserved.
	29	*
	30	* Permission to use, copy, modify and distribute this software and its
	31	* documentation is hereby granted, provided that both the copyright
	32	* notice and this permission notice appear in all copies of the
	33	* software, derivative works or modified versions, and any portions
	34	* thereof, and that both notices appear in supporting documentation.
	35	*
	36	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	37	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	38	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	39	*
	40	* Carnegie Mellon requests users of this software to return to
	41	*
	42	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	43	* School of Computer Science
	44	* Carnegie Mellon University
	45	* Pittsburgh PA 15213-3890
	46	*
	47	* any improvements or extensions that they make and grant Carnegie Mellon
	48	* the rights to redistribute these changes.
	49	*/
	50
	51	/*
	52	*/
	53
	54	/*
	55	* Machine-dependent definitions for cpu identification.
	56	*
	57	*/
	58	#ifndef _I386_CPU_NUMBER_H_
	59	#define _I386_CPU_NUMBER_H_
	60
9bccf70c A	61	#include <sys/appleapiopts.h>
	62
	63	#ifdef __APPLE_API_UNSTABLE
1c79356b A	64	extern int cpu_number(void);
	65
	66	#ifdef MACH_KERNEL_PRIVATE
	67
	68	#include <platforms.h>
	69	#include <cpus.h>
	70
	71	#include <mp_v1_1.h>
	72
	73	#if MP_V1_1
	74	#include <i386/apic.h>
	75	#include <i386/asm.h>
	76
	77	extern int lapic_id;
	78
	79	extern __inline__ int cpu_number(void)
	80	{
	81	register int cpu;
	82
	83	__asm__ volatile ("movl " CC_SYM_PREFIX "lapic_id, %0\n"
	84	" movl 0(%0), %0\n"
	85	" shrl %1, %0\n"
	86	" andl %2, %0"
	87	: "=r" (cpu)
	88	: "i" (LAPIC_ID_SHIFT), "i" (LAPIC_ID_MASK));
	89
	90	return(cpu);
	91	}
	92	#else /* MP_V1_1 */
	93	/*
	94	* At least one corollary cpu type does not have local memory at all.
	95	* The only way I found to store the cpu number was in some 386/486
	96	* system register. cr3 has bits 0, 1, 2 and 5, 6, 7, 8, 9, 10, 11
	97	* available. Right now we use 0, 1 and 2. So we are limited to 8 cpus.
	98	* For more cpus, we could use bits 5 - 11 with a shift.
	99	*
	100	* Even for other machines, like COMPAQ this is much faster the inb/outb
	101	* 4 cycles instead of 10 to 30.
	102	*/
	103	#if defined(__GNUC__)
	104	#if NCPUS > 8
	105	#error cpu_number() definition only works for #cpus <= 8
	106	#else
	107
	108	extern __inline__ int cpu_number(void)
	109	{
	110	register int cpu;
	111
	112	__asm__ volatile ("movl %%cr3, %0\n"
	113	" andl $0x7, %0"
	114	: "=r" (cpu));
	115	return(cpu);
	116	}
	117	#endif
	118	#endif /* defined(__GNUC__) */
	119
	120	#endif /* MP_V1_1 */
	121
	122	#endif /* MACH_KERNEL_PRIVATE */
	123
9bccf70c A	124	#endif /* __APPLE_API_UNSTABLE */
9bccf70c A	125
1c79356b	126	#endif /* _I386_CPU_NUMBER_H_ */