a05bab362f
This adds the new function pointer PCArch.clockinit(), which is a timer dependent initialization routine. It also takes over the job of guesscpuhz(). This way, the architecture ident code can switch between different timers (i8253, HPET and XEN timer).
96 lines
1.8 KiB
C
96 lines
1.8 KiB
C
#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "io.h"
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#include "ureg.h"
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#include "../port/error.h"
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extern int i8259assign(Vctl*);
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extern int i8259irqno(int, int);
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extern void i8259init(void);
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extern int i8259isr(int);
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extern void i8259on(void);
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extern void i8259off(void);
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extern int i8259vecno(int);
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void
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archreset(void)
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{
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i8042reset();
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/*
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* Often the BIOS hangs during restart if a conventional 8042
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* warm-boot sequence is tried. The following is Intel specific and
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* seems to perform a cold-boot, but at least it comes back.
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* And sometimes there is no keyboard...
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*
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* The reset register (0xcf9) is usually in one of the bridge
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* chips. The actual location and sequence could be extracted from
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* ACPI but why bother, this is the end of the line anyway.
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*/
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print("Takes a licking and keeps on ticking...\n");
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*(ushort*)KADDR(0x472) = 0x1234; /* BIOS warm-boot flag */
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outb(0xcf9, 0x02);
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outb(0xcf9, 0x06);
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print("can't reset\n");
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for(;;)
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idle();
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}
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void
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delay(int millisecs)
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{
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millisecs *= m->loopconst;
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if(millisecs <= 0)
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millisecs = 1;
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aamloop(millisecs);
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}
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void
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microdelay(int microsecs)
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{
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microsecs *= m->loopconst;
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microsecs /= 1000;
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if(microsecs <= 0)
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microsecs = 1;
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aamloop(microsecs);
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}
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/*
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* performance measurement ticks. must be low overhead.
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* doesn't have to count over a second.
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*/
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ulong
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perfticks(void)
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{
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uvlong x;
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if(m->havetsc)
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cycles(&x);
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else
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x = 0;
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return x;
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}
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PCArch archgeneric = {
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.id= "generic",
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.ident= 0,
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.reset= archreset,
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.intrinit= i8259init,
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.intrassign= i8259assign,
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.intrirqno= i8259irqno,
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.intrvecno= i8259vecno,
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.intrspurious= i8259isr,
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.intron= i8259on,
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.introff= i8259off,
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.clockinit= i8253init,
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.clockenable= i8253enable,
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.fastclock= i8253read,
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.timerset= i8253timerset,
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};
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