ref: f7e21d7692e619e9a926f29f2d59906c0d7ef072
dir: /sys/src/9/pc/archgeneric.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "ureg.h"
#include "../port/error.h"
extern int i8259assign(Vctl*);
extern int i8259irqno(int, int);
extern void i8259init(void);
extern int i8259isr(int);
extern void i8259on(void);
extern void i8259off(void);
extern int i8259vecno(int);
void
archreset(void)
{
i8042reset();
/*
* Often the BIOS hangs during restart if a conventional 8042
* warm-boot sequence is tried. The following is Intel specific and
* seems to perform a cold-boot, but at least it comes back.
* And sometimes there is no keyboard...
*
* The reset register (0xcf9) is usually in one of the bridge
* chips. The actual location and sequence could be extracted from
* ACPI but why bother, this is the end of the line anyway.
*/
print("Takes a licking and keeps on ticking...\n");
*(ushort*)KADDR(0x472) = 0x1234; /* BIOS warm-boot flag */
outb(0xcf9, 0x02);
outb(0xcf9, 0x06);
print("can't reset\n");
for(;;)
idle();
}
PCArch archgeneric = {
.id= "generic",
.ident= 0,
.reset= archreset,
.intrinit= i8259init,
.intrassign= i8259assign,
.intrirqno= i8259irqno,
.intrvecno= i8259vecno,
.intrspurious= i8259isr,
.intron= i8259on,
.introff= i8259off,
.clockenable= i8253enable,
.fastclock= i8253read,
.timerset= i8253timerset,
};