1108975fe0
The random value sometimes causes macro CLKF_USERMODE to return true because PSL_VM bit is set and really shoudn't be, this causes statclock() to execute in wrong path, and further breaks KSE code and kernel crashes when executing threaded program.
163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/*-
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* Copyright (c) 2001 Matthew Dillon. This code is distributed under
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* the BSD copyright, /usr/src/COPYRIGHT.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/signalvar.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/pcpu.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <sys/ucontext.h>
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#include <machine/clock.h>
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#include <machine/critical.h>
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#ifdef SMP
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#include <machine/privatespace.h>
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#include <machine/smp.h>
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#else
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/*
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* XXX this mess to get sched_ithd() and call_fast_unpend()
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*/
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#include <sys/bus.h>
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#include <machine/apic.h>
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#include <machine/frame.h>
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#include <i386/isa/icu.h>
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#include <i386/isa/intr_machdep.h>
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#endif
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void i386_unpend(void); /* NOTE: not static, called from assembly */
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/*
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* cpu_unpend() - called from critical_exit() inline after quick
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* interrupt-pending check.
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*/
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void
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cpu_unpend(void)
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{
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register_t eflags;
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struct thread *td;
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td = curthread;
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eflags = intr_disable();
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if (PCPU_GET(int_pending)) {
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++td->td_intr_nesting_level;
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i386_unpend();
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--td->td_intr_nesting_level;
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}
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intr_restore(eflags);
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}
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/*
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* cpu_critical_fork_exit() - cleanup after fork
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*
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* For i386 we do not have to do anything, td_critnest is
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* handled by the fork trampoline code.
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*/
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void
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cpu_critical_fork_exit(void)
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{
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}
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/*
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* cpu_thread_link() - thread linkup, initialize machine-dependant fields
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*
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* There are currently no machine-dependant fields that require
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* initialization.
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*/
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void
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cpu_thread_link(struct thread *td)
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{
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}
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/*
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* Called from cpu_unpend or called from the assembly vector code
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* to process any interrupts which may have occured while we were in
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* a critical section.
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*
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* - interrupts must be disabled
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* - td_critnest must be 0
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* - td_intr_nesting_level must be incremented by the caller
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*
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* NOT STATIC (called from assembly)
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*/
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void
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i386_unpend(void)
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{
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struct clockframe frame;
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frame.cf_cs = SEL_KPL;
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frame.cf_eip = (register_t)i386_unpend;
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frame.cf_eflags = PSL_KERNEL;
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KASSERT(curthread->td_critnest == 0, ("unpend critnest != 0"));
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KASSERT((read_eflags() & PSL_I) == 0, ("unpend interrupts enabled1"));
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curthread->td_critnest = 1;
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for (;;) {
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u_int32_t mask;
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int irq;
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/*
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* Fast interrupts have priority
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*/
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if ((mask = PCPU_GET(fpending)) != 0) {
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irq = bsfl(mask);
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PCPU_SET(fpending, mask & ~(1 << irq));
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call_fast_unpend(irq);
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KASSERT((read_eflags() & PSL_I) == 0,
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("unpend interrupts enabled2 %d", irq));
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continue;
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}
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/*
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* Threaded interrupts come next
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*/
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if ((mask = PCPU_GET(ipending)) != 0) {
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irq = bsfl(mask);
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PCPU_SET(ipending, mask & ~(1 << irq));
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sched_ithd((void *)irq);
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KASSERT((read_eflags() & PSL_I) == 0,
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("unpend interrupts enabled3 %d", irq));
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continue;
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}
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/*
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* Software interrupts and delayed IPIs are last
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*
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* XXX give the bits #defined names. see also
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* isa/xxx_vector.s
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*/
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if ((mask = PCPU_GET(spending)) != 0) {
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irq = bsfl(mask);
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PCPU_SET(spending, mask & ~(1 << irq));
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switch(irq) {
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case 0: /* bit 0 - hardclock */
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hardclock_process(&frame);
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break;
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case 1: /* bit 1 - statclock */
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if (profprocs != 0)
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profclock(&frame);
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if (pscnt == psdiv)
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statclock(&frame);
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break;
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}
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KASSERT((read_eflags() & PSL_I) == 0,
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("unpend interrupts enabled4 %d", irq));
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continue;
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}
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break;
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}
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/*
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* Interrupts are still disabled, we can safely clear int_pending
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* and td_critnest.
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*/
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KASSERT((read_eflags() & PSL_I) == 0, ("unpend interrupts enabled5"));
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PCPU_SET(int_pending, 0);
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curthread->td_critnest = 0;
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}
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