afa8862328
a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to attempt to get a stable base to start from. There is a lot missing still. Worth noting: - The kernel runs at 1GB in order to cheat with the pmap code. pmap uses a variation of the PAE code in order to avoid having to worry about 4 levels of page tables yet. - It boots in 64 bit "long mode" with a tiny trampoline embedded in the i386 loader. This simplifies locore.s greatly. - There are still quite a few fragments of i386-specific code that have not been translated yet, and some that I cheated and wrote dumb C versions of (bcopy etc). - It has both int 0x80 for syscalls (but using registers for argument passing, as is native on the amd64 ABI), and the 'syscall' instruction for syscalls. int 0x80 preserves all registers, 'syscall' does not. - I have tried to minimize looking at the NetBSD code, except in a couple of places (eg: to find which register they use to replace the trashed %rcx register in the syscall instruction). As a result, there is not a lot of similarity. I did look at NetBSD a few times while debugging to get some ideas about what I might have done wrong in my first attempt.
114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
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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. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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 BSDI: intr.c,v 1.6.2.5 1999/07/06 19:16:52 cp Exp
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* $FreeBSD$
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*/
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/* Interrupt thread code. */
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/interrupt.h>
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#include <sys/systm.h>
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#include <sys/vmmeter.h>
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#include <amd64/isa/icu.h>
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#include <amd64/isa/intr_machdep.h>
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#include <amd64/isa/isa.h>
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struct int_entropy {
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struct proc *p;
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int irq;
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};
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static u_int straycount[ICU_LEN];
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static u_int glitchcount7;
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static u_int glitchcount15;
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#define MAX_STRAY_LOG 5
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/*
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* Schedule a heavyweight interrupt process. This function is called
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* from the interrupt handlers Xintr<num>.
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*/
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void
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sched_ithd(void *cookie)
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{
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int irq = (uintptr_t) cookie; /* IRQ we're handling */
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struct ithd *ithd = ithds[irq]; /* and the process that does it */
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int error, isr;
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/* This used to be in icu_vector.s */
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/*
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* We count software interrupts when we process them. The
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* code here follows previous practice, but there's an
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* argument for counting hardware interrupts when they're
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* processed too.
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*/
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atomic_add_long(intr_countp[irq], 1); /* one more for this IRQ */
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atomic_add_int(&cnt.v_intr, 1); /* one more global interrupt */
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/*
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* Schedule the interrupt thread to run if needed and switch to it
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* if we schedule it if !cold.
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*/
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error = ithread_schedule(ithd, !cold);
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/*
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* Log stray interrupts.
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*/
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if (error == EINVAL) {
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/* Determine if it is a stray interrupt or simply a glitch */
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if (irq == 7) {
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outb(IO_ICU1, OCW3_SEL); /* select IS register */
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isr = inb(IO_ICU1);
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outb(IO_ICU1, OCW3_SEL | OCW3_RIS); /* reselect IIR */
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if ((isr & 0x80) == 0) {
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glitchcount7++;
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return;
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}
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}
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if (irq == 15) {
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outb(IO_ICU2, OCW3_SEL); /* select IS register */
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isr = inb(IO_ICU2);
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outb(IO_ICU2, OCW3_SEL | OCW3_RIS); /* reselect IIR */
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if ((isr & 0x80) == 0) {
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glitchcount15++;
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return;
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}
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}
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if (straycount[irq] < MAX_STRAY_LOG) {
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printf("stray irq %d\n", irq);
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if (++straycount[irq] == MAX_STRAY_LOG)
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printf(
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"got %d stray irq %d's: not logging anymore\n",
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MAX_STRAY_LOG, irq);
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}
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}
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}
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