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been made machine independent and various other adjustments have been made to support Alpha SMP. - It splits the per-process portions of hardclock() and statclock() off into hardclock_process() and statclock_process() respectively. hardclock() and statclock() call the *_process() functions for the current process so that UP systems will run as before. For SMP systems, it is simply necessary to ensure that all other processors execute the *_process() functions when the main clock functions are triggered on one CPU by an interrupt. For the alpha 4100, clock interrupts are delievered in a staggered broadcast fashion, so we simply call hardclock/statclock on the boot CPU and call the *_process() functions on the secondaries. For x86, we call statclock and hardclock as usual and then call forward_hardclock/statclock in the MD code to send an IPI to cause the AP's to execute forwared_hardclock/statclock which then call the *_process() functions. - forward_signal() and forward_roundrobin() have been reworked to be MI and to involve less hackery. Now the cpu doing the forward sets any flags, etc. and sends a very simple IPI_AST to the other cpu(s). AST IPIs now just basically return so that they can execute ast() and don't bother with setting the astpending or needresched flags themselves. This also removes the loop in forward_signal() as sched_lock closes the race condition that the loop worked around. - need_resched(), resched_wanted() and clear_resched() have been changed to take a process to act on rather than assuming curproc so that they can be used to implement forward_roundrobin() as described above. - Various other SMP variables have been moved to a MI subr_smp.c and a new header sys/smp.h declares MI SMP variables and API's. The IPI API's from machine/ipl.h have moved to machine/smp.h which is included by sys/smp.h. - The globaldata_register() and globaldata_find() functions as well as the SLIST of globaldata structures has become MI and moved into subr_smp.c. Also, the globaldata list is only available if SMP support is compiled in. Reviewed by: jake, peter Looked over by: eivind
131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
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* $FreeBSD$
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*/
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#ifndef _MACHINE_CPU_H_
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#define _MACHINE_CPU_H_
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/*
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* Definitions unique to i386 cpu support.
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*/
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#include <machine/psl.h>
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#include <machine/frame.h>
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#include <machine/segments.h>
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#include <machine/globals.h>
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/*
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* definitions of cpu-dependent requirements
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* referenced in generic code
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*/
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#undef COPY_SIGCODE /* don't copy sigcode above user stack in exec */
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#define cpu_exec(p) /* nothing */
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#define cpu_swapin(p) /* nothing */
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#define cpu_getstack(p) ((p)->p_md.md_regs->tf_esp)
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#define cpu_setstack(p, ap) ((p)->p_md.md_regs->tf_esp = (ap))
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#define TRAPF_USERMODE(framep) \
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((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
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#define TRAPF_PC(framep) ((framep)->tf_eip)
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#define CLKF_USERMODE(framep) \
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((ISPL((framep)->cf_cs) == SEL_UPL) || ((framep)->cf_eflags & PSL_VM))
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#define CLKF_PC(framep) ((framep)->cf_eip)
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/*
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* Arrange to handle pending profiling ticks before returning to user mode.
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*
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* XXX this is now poorly named and implemented. It used to handle only a
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* single tick and the PS_OWEUPC flag served as a counter. Now there is a
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* counter in the proc table and flag isn't really necessary.
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*/
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#define need_proftick(p) do { \
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mtx_lock_spin(&sched_lock); \
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(p)->p_sflag |= PS_OWEUPC; \
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aston(p); \
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mtx_unlock_spin(&sched_lock); \
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} while (0)
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/*
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* CTL_MACHDEP definitions.
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*/
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#define CPU_CONSDEV 1 /* dev_t: console terminal device */
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#define CPU_ADJKERNTZ 2 /* int: timezone offset (seconds) */
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#define CPU_DISRTCSET 3 /* int: disable resettodr() call */
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#define CPU_BOOTINFO 4 /* struct: bootinfo */
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#define CPU_WALLCLOCK 5 /* int: indicates wall CMOS clock */
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#define CPU_MAXID 6 /* number of valid machdep ids */
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#define CTL_MACHDEP_NAMES { \
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{ 0, 0 }, \
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{ "console_device", CTLTYPE_STRUCT }, \
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{ "adjkerntz", CTLTYPE_INT }, \
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{ "disable_rtc_set", CTLTYPE_INT }, \
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{ "bootinfo", CTLTYPE_STRUCT }, \
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{ "wall_cmos_clock", CTLTYPE_INT }, \
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}
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#ifdef _KERNEL
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extern char btext[];
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extern char etext[];
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extern u_int tsc_present;
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void fork_trampoline __P((void));
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/*
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* Return contents of in-cpu fast counter as a sort of "bogo-time"
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* for non-critical timing.
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*/
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static __inline u_int64_t
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get_cyclecount(void)
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{
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#if defined(I386_CPU) || defined(I486_CPU)
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struct timespec tv;
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if (!tsc_present) {
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nanotime(&tv);
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return (tv.tv_sec * (u_int64_t)1000000000 + tv.tv_nsec);
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}
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#endif
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return (rdtsc());
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}
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#endif
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#endif /* !_MACHINE_CPU_H_ */
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