return through doreti to handle ast's. This is necessary for the clock interrupts to work properly. - Change the clock interrupts on the x86 to be fast instead of threaded. This is needed because both hardclock() and statclock() need to run in the context of the current process, not in a separate thread context. - Kill the prevproc hack as it is no longer needed. - We really need Giant when we call psignal(), but we don't want to block during the clock interrupt. Instead, use two p_flag's in the proc struct to mark the current process as having a pending SIGVTALRM or a SIGPROF and let them be delivered during ast() when hardclock() has finished running. - Remove CLKF_BASEPRI, which was #ifdef'd out on the x86 anyways. It was broken on the x86 if it was turned on since cpl is gone. It's only use was to bogusly run softclock() directly during hardclock() rather than scheduling an SWI. - Remove the COM_LOCK simplelock and replace it with a clock_lock spin mutex. Since the spin mutex already handles disabling/restoring interrupts appropriately, this also lets us axe all the *_intr() fu. - Back out the hacks in the APIC_IO x86 cpu_initclocks() code to use temporary fast interrupts for the APIC trial. - Add two new process flags P_ALRMPEND and P_PROFPEND to mark the pending signals in hardclock() that are to be delivered in ast(). Submitted by: jakeb (making statclock safe in a fast interrupt) Submitted by: cp (concept of delaying signals until ast())
136 lines
4.8 KiB
C
136 lines
4.8 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_setstack(p, ap) ((p)->p_md.md_regs[SP] = (ap))
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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_INTR(framep) (intr_nesting_level >= 2)
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#define CLKF_PC(framep) ((framep)->cf_eip)
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/*
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* Preempt the current process if in interrupt from user mode,
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* or after the current trap/syscall if in system mode.
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*
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* XXX: if astpending is later changed to an |= here due to more flags being
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* added, we will have an atomicy problem. The type of atomicy we need is
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* a non-locked orl.
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*/
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#define need_resched() do { \
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PCPU_SET(astpending, AST_RESCHED|AST_PENDING); \
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} while (0)
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#define resched_wanted() (astpending & AST_RESCHED)
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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 P_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) \
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do { (p)->p_flag |= P_OWEUPC; aston(); } while (0)
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/*
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* Notify the current process (p) that it has a signal pending,
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* process as soon as possible.
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*
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* XXX: aston() really needs to be an atomic (not locked, but an orl),
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* in case need_resched() is set by an interrupt. But with astpending a
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* per-cpu variable this is not trivial to do efficiently. For now we blow
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* it off (asynchronous need_resched() conflicts are not critical).
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*/
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#define signotify(p) aston()
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#define aston() do { \
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PCPU_SET(astpending, astpending | AST_PENDING); \
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} while (0)
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#define astoff()
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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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#ifndef intr_nesting_level
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extern u_char intr_nesting_level;
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#endif
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void fork_trampoline __P((void));
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void fork_return __P((struct proc *, struct trapframe));
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#endif
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#endif /* !_MACHINE_CPU_H_ */
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