[dragonfly.git] / sys / cpu / x86_64 / include / param.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * Copyright (c) 2008 The DragonFly Project.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)param.h	5.8 (Berkeley) 6/28/91
 * $FreeBSD: src/sys/i386/include/param.h,v 1.54.2.8 2002/08/31 21:15:55 dillon Exp $
 */

#ifndef _CPU_PARAM_H_

/*
 * Do not prevent re-includes of <machine/param.h> if the file was included
 * with NO_NAMESPACE_POLLUTION, or expected macros will not exist.
 */
#ifndef _NO_NAMESPACE_POLLUTION
#define _CPU_PARAM_H_
#endif

/*
 * Machine dependent constants for x86_64.
 */
#ifndef _CPU_PARAM_H1_
#define _CPU_PARAM_H1_

/*
 * Round p (pointer or byte index) up to a correctly-aligned value
 * for all data types (int, long, ...).   The result is unsigned int
 * and must be cast to any desired pointer type.
 */
#ifndef _ALIGNBYTES
#define _ALIGNBYTES	(sizeof(long) - 1)
#endif
#ifndef _ALIGN
#define _ALIGN(p)	(((unsigned long)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
#endif

#ifndef _MACHINE
#define	_MACHINE	x86_64
#endif
#ifndef _MACHINE_ARCH
#define	_MACHINE_ARCH	x86_64
#endif

#endif	/* _CPU_PARAM_H1_ */

#ifndef _NO_NAMESPACE_POLLUTION

#ifndef MACHINE
#define MACHINE		"x86_64"
#endif
#ifndef MACHINE_ARCH
#define	MACHINE_ARCH	"x86_64"
#endif

/*
 * Use SMP_MAXCPU instead of MAXCPU for structures that are intended to
 * remain compatible between UP and SMP builds.
 */
#define SMP_MAXCPU	16
#ifdef SMP
#define MAXCPU		SMP_MAXCPU
#else
#define MAXCPU		1
#endif /* SMP */

#define ALIGNBYTES	_ALIGNBYTES
#define ALIGN(p)	_ALIGN(p)

/* JG license? from fbsd/src/sys/amd64/include/param.h */
/* level 1 == page table */
#define	NPTEPGSHIFT	9		/* LOG2(NPTEPG) */
#define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
#define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes/page */
#define PAGE_MASK	(PAGE_SIZE-1)
#define NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))

/* level 2 == page directory */
#define	NPDEPGSHIFT	9		/* LOG2(NPDEPG) */
#define PDRSHIFT	21		/* LOG2(NBPDR) */
#define NBPDR		(1<<PDRSHIFT)	/* bytes/page dir */
#define PDRMASK		(NBPDR-1)
#define NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))

/* level 3 == page directory pointer table */
#define	NPDPEPGSHIFT	9		/* LOG2(NPDPEPG) */
#define PDPSHIFT	30		/* LOG2(NBPDP) */
#define NBPDP		(1<<PDPSHIFT)	/* bytes/page dir ptr table */
#define PDPMASK		(NBPDP-1)
#define NPDPEPG		(PAGE_SIZE/(sizeof (pdp_entry_t)))

/* level 4 */
#define	NPML4EPGSHIFT	9		/* LOG2(NPML4EPG) */
#define PML4SHIFT	39		/* LOG2(NPML4) */
#define NPML4		(1UL<<PML4SHIFT)/* bytes/page map level4 table */
#define	NBPML4		(1ul<<PML4SHIFT)/* bytes/page map lev4 table */
#define PML4MASK	(NPML4-1)
#define NPML4EPG	(PAGE_SIZE/(sizeof (pml4_entry_t)))

#define DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
#define DEV_BSIZE	(1<<DEV_BSHIFT)
#define DEV_BMASK	(DEV_BSIZE - 1)

#ifndef BLKDEV_IOSIZE
#define BLKDEV_IOSIZE	PAGE_SIZE	/* default block device I/O size */
#endif
#define DFLTPHYS	(64 * 1024)	/* default max raw I/O transfer size */
#define MAXPHYS		(128 * 1024)	/* max raw I/O transfer size */
#define MAXDUMPPGS	(DFLTPHYS/PAGE_SIZE)

#define IOPAGES	2		/* pages of i/o permission bitmap */
#define UPAGES	3		/* pages of u-area */

/*
 * Ceiling on amount of swblock kva space, can be changed via
 * kern.maxswzone /boot/loader.conf variable.  On 64 bit machines
 * the kernel has a 512G address space so reserving 512M of KVM
 * is not a big deal.
 *
 * Approximately (size / 160 x 32 x PAGE_SIZE) bytes of swap.  This
 * comes to approximately 1GB of swap space per 1MB of kernel memory.
 * Actually using 512G of swap will tie up a big chunk (512M) of physical
 * memory.
 */
#ifndef VM_SWZONE_SIZE_MAX
#define VM_SWZONE_SIZE_MAX	(512L * 1024 * 1024)
#endif

/*
 * Ceiling on size of buffer cache (really only effects write queueing,
 * the VM page cache is not effected), can be changed via
 * kern.maxbcache /boot/loader.conf variable.
 */
#ifndef VM_BCACHE_SIZE_MAX
#define VM_BCACHE_SIZE_MAX	(200L * 1024 * 1024)
#endif


/*
 * Constants related to network buffer management.
 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
 * on machines that exchange pages of input or output buffers with mbuf
 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 * of the hardware page size.
 */
#ifndef	MSIZE
#define MSIZE		512		/* size of an mbuf */
#endif	/* MSIZE */

#ifndef	MCLSHIFT
#define MCLSHIFT	11		/* convert bytes to m_buf clusters */
#endif	/* MCLSHIFT */
#define MCLBYTES	(1 << MCLSHIFT)	/* size of an m_buf cluster */
#define MCLOFSET	(MCLBYTES - 1)	/* offset within an m_buf cluster */

/*
 * Some macros for units conversion
 */

/* clicks to bytes */
#define ctob(x)	((x)<<PAGE_SHIFT)

/* bytes to clicks */
#define btoc(x)	(((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)

/*
 * btodb() is messy and perhaps slow because `bytes' may be an off_t.  We
 * want to shift an unsigned type to avoid sign extension and we don't
 * want to widen `bytes' unnecessarily.  Assume that the result fits in
 * a daddr_t.
 */
#define btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
	(sizeof (bytes) > sizeof(long) \
	 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
	 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))

#define dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
	((off_t)(db) << DEV_BSHIFT)

/*
 * Mach derived conversion macros
 */
#define	round_page(x)	((((unsigned long)(x)) + PAGE_MASK) & ~(unsigned long)(PAGE_MASK))
#define	trunc_page(x)	((unsigned long)(x) & ~(unsigned long)(PAGE_MASK))
#define trunc_2mpage(x)	((unsigned long)(x) & ~(unsigned long)PDRMASK)
#define round_2mpage(x)	((((unsigned long)(x)) + PDRMASK) & ~(unsigned long)PDRMASK)

#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
#define	atop(x)		((vm_pindex_t)((x) >> PAGE_SHIFT))
#endif
#define	ptoa(x)		((vm_paddr_t)(x) << PAGE_SHIFT)

#define	x86_64_btop(x)	((vm_pindex_t)((x) >> PAGE_SHIFT))
#define	x86_64_ptob(x)	((vm_paddr_t)(x) << PAGE_SHIFT)

#define	pgtok(x)		((x) * (PAGE_SIZE / 1024))

#ifdef _KERNEL

/*
 * We put here the definition of two debugging macros/function which
 * are very convenient to have available.
 * The macro is called TSTMP() and is used to timestamp events in the
 * kernel using the TSC register, and export them to userland through
 * the sysctl variable debug.timestamp, which is a circular buffer
 * holding pairs of u_int32_t variables <timestamp, argument> .
 * They can be retrieved with something like
 *
 *	sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
 *
 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
 * try to grab any locks or block interrupts or identify which CPU it
 * is running on. You are supposed to know what to do if you use it.
 *
 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
 * config file, otherwise they default to an empty block.
 */

#ifdef KERN_TIMESTAMP
extern void _TSTMP(u_int32_t argument);
#define TSTMP(class, unit, event, par)	_TSTMP(	\
	(((class) &   0x0f) << 28 ) |		\
	(((unit)  &   0x0f) << 24 ) |		\
	(((event) &   0xff) << 16 ) |		\
	(((par)   & 0xffff)       )   )

#else /* !KERN_TIMESTAMP */
#define        _TSTMP(x)                       {}
#define        TSTMP(class, unit, event, par)  _TSTMP(0)
#endif /* !KERN_TIMESTAMP */
#endif /* _KERNEL */

#endif /* !_NO_NAMESPACE_POLLUTION */
#endif /* !_CPU_PARAM_H_ */
Commit	Line	Data
fc3f9779 SS	1	/*-
fc3f9779 SS	2	* Copyright (c) 1990 The Regents of the University of California.
c8fe38ae	3	* Copyright (c) 2008 The DragonFly Project.
fc3f9779 SS	4	* All rights reserved.
	5	*
	6	* This code is derived from software contributed to Berkeley by
	7	* William Jolitz.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in the
	16	* documentation and/or other materials provided with the distribution.
	17	* 3. All advertising materials mentioning features or use of this software
	18	* must display the following acknowledgement:
	19	* This product includes software developed by the University of
	20	* California, Berkeley and its contributors.
	21	* 4. Neither the name of the University nor the names of its contributors
	22	* may be used to endorse or promote products derived from this software
	23	* without specific prior written permission.
	24	*
	25	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	26	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	27	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	28	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	29	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	30	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	31	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	32	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	33	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	34	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	35	* SUCH DAMAGE.
	36	*
	37	* from: @(#)param.h 5.8 (Berkeley) 6/28/91
	38	* $FreeBSD: src/sys/i386/include/param.h,v 1.54.2.8 2002/08/31 21:15:55 dillon Exp $
fc3f9779 SS	39	*/
	40
	41	#ifndef _CPU_PARAM_H_
	42
	43	/*
	44	* Do not prevent re-includes of <machine/param.h> if the file was included
	45	* with NO_NAMESPACE_POLLUTION, or expected macros will not exist.
	46	*/
	47	#ifndef _NO_NAMESPACE_POLLUTION
	48	#define _CPU_PARAM_H_
	49	#endif
	50
	51	/*
02fc0ba7	52	* Machine dependent constants for x86_64.
fc3f9779 SS	53	*/
	54	#ifndef _CPU_PARAM_H1_
	55	#define _CPU_PARAM_H1_
	56
	57	/*
	58	* Round p (pointer or byte index) up to a correctly-aligned value
	59	* for all data types (int, long, ...). The result is unsigned int
	60	* and must be cast to any desired pointer type.
	61	*/
	62	#ifndef _ALIGNBYTES
	63	#define _ALIGNBYTES (sizeof(long) - 1)
	64	#endif
	65	#ifndef _ALIGN
	66	#define _ALIGN(p) (((unsigned long)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
	67	#endif
	68
02fc0ba7	69	#ifndef _MACHINE
c1543a89	70	#define _MACHINE x86_64
fc3f9779	71	#endif
02fc0ba7	72	#ifndef _MACHINE_ARCH
c1543a89	73	#define _MACHINE_ARCH x86_64
fc3f9779 SS	74	#endif
fc3f9779 SS	75
fc3f9779 SS	76	#endif /* _CPU_PARAM_H1_ */
	77
	78	#ifndef _NO_NAMESPACE_POLLUTION
	79
02fc0ba7	80	#ifndef MACHINE
c1543a89	81	#define MACHINE "x86_64"
fc3f9779	82	#endif
02fc0ba7	83	#ifndef MACHINE_ARCH
c1543a89	84	#define MACHINE_ARCH "x86_64"
fc3f9779 SS	85	#endif
	86
	87	/*
	88	* Use SMP_MAXCPU instead of MAXCPU for structures that are intended to
	89	* remain compatible between UP and SMP builds.
	90	*/
	91	#define SMP_MAXCPU 16
	92	#ifdef SMP
	93	#define MAXCPU SMP_MAXCPU
	94	#else
	95	#define MAXCPU 1
	96	#endif /* SMP */
	97
	98	#define ALIGNBYTES _ALIGNBYTES
	99	#define ALIGN(p) _ALIGN(p)
	100
c8fe38ae	101	/* JG license? from fbsd/src/sys/amd64/include/param.h */
fc3f9779	102	/* level 1 == page table */
c8fe38ae	103	#define NPTEPGSHIFT 9 /* LOG2(NPTEPG) */
fc3f9779 SS	104	#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
	105	#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
	106	#define PAGE_MASK (PAGE_SIZE-1)
	107	#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
	108
	109	/* level 2 == page directory */
c8fe38ae	110	#define NPDEPGSHIFT 9 /* LOG2(NPDEPG) */
fc3f9779 SS	111	#define PDRSHIFT 21 /* LOG2(NBPDR) */
	112	#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
	113	#define PDRMASK (NBPDR-1)
	114	#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
	115
	116	/* level 3 == page directory pointer table */
c8fe38ae	117	#define NPDPEPGSHIFT 9 /* LOG2(NPDPEPG) */
fc3f9779 SS	118	#define PDPSHIFT 30 /* LOG2(NBPDP) */
	119	#define NBPDP (1<<PDPSHIFT) /* bytes/page dir ptr table */
	120	#define PDPMASK (NBPDP-1)
	121	#define NPDPEPG (PAGE_SIZE/(sizeof (pdp_entry_t)))
	122
	123	/* level 4 */
c8fe38ae	124	#define NPML4EPGSHIFT 9 /* LOG2(NPML4EPG) */
fc3f9779 SS	125	#define PML4SHIFT 39 /* LOG2(NPML4) */
fc3f9779 SS	126	#define NPML4 (1UL<<PML4SHIFT)/* bytes/page map level4 table */
c8fe38ae	127	#define NBPML4 (1ul<<PML4SHIFT)/* bytes/page map lev4 table */
fc3f9779 SS	128	#define PML4MASK (NPML4-1)
	129	#define NPML4EPG (PAGE_SIZE/(sizeof (pml4_entry_t)))
	130
fc3f9779 SS	131	#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
	132	#define DEV_BSIZE (1<<DEV_BSHIFT)
	133	#define DEV_BMASK (DEV_BSIZE - 1)
	134
	135	#ifndef BLKDEV_IOSIZE
	136	#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
	137	#endif
	138	#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
	139	#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
	140	#define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)
	141
	142	#define IOPAGES 2 /* pages of i/o permission bitmap */
	143	#define UPAGES 3 /* pages of u-area */
	144
	145	/*
	146	* Ceiling on amount of swblock kva space, can be changed via
392e8d79 MD	147	* kern.maxswzone /boot/loader.conf variable. On 64 bit machines
	148	* the kernel has a 512G address space so reserving 512M of KVM
	149	* is not a big deal.
79634a66	150	*
392e8d79	151	* Approximately (size / 160 x 32 x PAGE_SIZE) bytes of swap. This
79634a66	152	* comes to approximately 1GB of swap space per 1MB of kernel memory.
392e8d79 MD	153	* Actually using 512G of swap will tie up a big chunk (512M) of physical
392e8d79 MD	154	* memory.
fc3f9779 SS	155	*/
fc3f9779 SS	156	#ifndef VM_SWZONE_SIZE_MAX
392e8d79	157	#define VM_SWZONE_SIZE_MAX (512L * 1024 * 1024)
fc3f9779 SS	158	#endif
	159
	160	/*
	161	* Ceiling on size of buffer cache (really only effects write queueing,
	162	* the VM page cache is not effected), can be changed via
	163	* kern.maxbcache /boot/loader.conf variable.
	164	*/
	165	#ifndef VM_BCACHE_SIZE_MAX
79634a66	166	#define VM_BCACHE_SIZE_MAX (200L * 1024 * 1024)
fc3f9779 SS	167	#endif
	168
	169
	170	/*
	171	* Constants related to network buffer management.
	172	* MCLBYTES must be no larger than CLBYTES (the software page size), and,
	173	* on machines that exchange pages of input or output buffers with mbuf
	174	* clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
	175	* of the hardware page size.
	176	*/
	177	#ifndef MSIZE
c8fe38ae	178	#define MSIZE 512 /* size of an mbuf */
fc3f9779 SS	179	#endif /* MSIZE */
	180
	181	#ifndef MCLSHIFT
	182	#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
	183	#endif /* MCLSHIFT */
	184	#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
	185	#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
	186
	187	/*
	188	* Some macros for units conversion
	189	*/
	190
	191	/* clicks to bytes */
	192	#define ctob(x) ((x)<<PAGE_SHIFT)
	193
	194	/* bytes to clicks */
	195	#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
	196
	197	/*
	198	* btodb() is messy and perhaps slow because `bytes' may be an off_t. We
	199	* want to shift an unsigned type to avoid sign extension and we don't
	200	* want to widen `bytes' unnecessarily. Assume that the result fits in
	201	* a daddr_t.
	202	*/
	203	#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
	204	(sizeof (bytes) > sizeof(long) \
	205	? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
	206	: (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
	207
	208	#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
	209	((off_t)(db) << DEV_BSHIFT)
	210
	211	/*
	212	* Mach derived conversion macros
	213	*/
89ffa1cf SS	214	#define round_page(x) ((((unsigned long)(x)) + PAGE_MASK) & ~(unsigned long)(PAGE_MASK))
	215	#define trunc_page(x) ((unsigned long)(x) & ~(unsigned long)(PAGE_MASK))
	216	#define trunc_2mpage(x) ((unsigned long)(x) & ~(unsigned long)PDRMASK)
	217	#define round_2mpage(x) ((((unsigned long)(x)) + PDRMASK) & ~(unsigned long)PDRMASK)
fc3f9779 SS	218
fc3f9779 SS	219	#if defined(_KERNEL) \|\| defined(_KERNEL_STRUCTURES)
c8fe38ae	220	#define atop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
fc3f9779	221	#endif
c8fe38ae	222	#define ptoa(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
fc3f9779	223
c1543a89 SS	224	#define x86_64_btop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
c1543a89 SS	225	#define x86_64_ptob(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
fc3f9779 SS	226
	227	#define pgtok(x) ((x) * (PAGE_SIZE / 1024))
	228
	229	#ifdef _KERNEL
	230
	231	/*
	232	* We put here the definition of two debugging macros/function which
	233	* are very convenient to have available.
	234	* The macro is called TSTMP() and is used to timestamp events in the
	235	* kernel using the TSC register, and export them to userland through
	236	* the sysctl variable debug.timestamp, which is a circular buffer
	237	* holding pairs of u_int32_t variables <timestamp, argument> .
	238	* They can be retrieved with something like
	239	*
	240	* sysctl -b debug.timestamp \| hexdump -e '"%15u %15u\n"'
	241	*
	242	* The function _TSTMP() is defined in i386/isa/clock.c. It does not
	243	* try to grab any locks or block interrupts or identify which CPU it
	244	* is running on. You are supposed to know what to do if you use it.
	245	*
	246	* The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
	247	* config file, otherwise they default to an empty block.
	248	*/
	249
	250	#ifdef KERN_TIMESTAMP
	251	extern void _TSTMP(u_int32_t argument);
	252	#define TSTMP(class, unit, event, par) _TSTMP( \
	253	(((class) & 0x0f) << 28 ) \| \
	254	(((unit) & 0x0f) << 24 ) \| \
	255	(((event) & 0xff) << 16 ) \| \
	256	(((par) & 0xffff) ) )
	257
	258	#else /* !KERN_TIMESTAMP */
	259	#define _TSTMP(x) {}
	260	#define TSTMP(class, unit, event, par) _TSTMP(0)
	261	#endif /* !KERN_TIMESTAMP */
	262	#endif /* _KERNEL */
	263
	264	#endif /* !_NO_NAMESPACE_POLLUTION */
	265	#endif /* !_CPU_PARAM_H_ */