163 lines
5.3 KiB
C
163 lines
5.3 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 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) (PCPU_GET(intr_nesting_level) >= 2)
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#define CLKF_PC(framep) ((framep)->cf_eip)
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/*
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* astpending bits
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*/
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#define AST_PENDING 0x00000001
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#define AST_RESCHED 0x00000002
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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() (PCPU_GET(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, PCPU_GET(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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void fork_trampoline __P((void));
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void fork_return __P((struct proc *, struct trapframe));
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#if defined(I386_CPU) || defined(I486_CPU)
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extern u_int tsc_present;
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#endif
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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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