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Add the address of IDT in the configuration ROM. (i386/amd64 only)

Browse source 
A change to dconschat(8) will follow so that it can bomb
this address over FireWire to reset a wedged system.

Though this method is just a hack and far from perfection,
it should be useful if you don't want to go machine room
just to reset or to power-cycle a machine without
remote-managed power supply.  And much better than doing:
# fwcontrol -m target-eui64
# dd if=/dev/zero of=/dev/fwmem0.2 bs=1m
This commit is contained in:
Hidetoshi Shimokawa 2007-06-08 04:33:25 +00:00
parent 17ee700be6
commit 293b847542
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=170420
2 changed files with 27 additions and 0 deletions
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3
sys/dev/dcons/dcons.h
View file

@ -65,6 +65,8 @@ struct dcons_buf {
#define DCONS_CSR_VAL_VER 0x64636f /* "dco" */
#define DCONS_CSR_KEY_HI 0x3a
#define DCONS_CSR_KEY_LO 0x3b
#define DCONS_CSR_KEY_RESET_HI 0x3c
#define DCONS_CSR_KEY_RESET_LO 0x3d
#define DCONS_HEADER_SIZE sizeof(struct dcons_buf)
#define DCONS_MAKE_PTR(x) htonl(((x)->gen << DCONS_GEN_SHIFT) | (x)->pos)
@ -88,6 +90,7 @@ struct dcons_ch {
#define STATE0 0
#define STATE1 1
#define STATE2 2
#define STATE3 3
#if defined(_KERNEL) || defined(_BOOT)
struct dcons_softc {

24
sys/dev/dcons/dcons_crom.c
View file

@ -62,6 +62,14 @@
#include <sys/cons.h>
#define EXPOSE_IDT_ADDR 1
#if (defined(__i386__) || defined(__amd64__)) && defined(EXPOSE_IDT_ADDR)
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <machine/segments.h> /* for idt */
#endif
static bus_addr_t dcons_paddr;
#if __FreeBSD_version >= 500000
@ -108,6 +116,19 @@ dcons_crom_probe(device_t dev)
}
#ifndef NEED_NEW_DRIVER
#if (defined(__i386__) || defined(__amd64__)) && defined(EXPOSE_IDT_ADDR)
static void
dcons_crom_expose_idt(struct dcons_crom_softc *sc)
{
static off_t idt_paddr;
/* XXX */
idt_paddr = (char *)idt - (char *)KERNBASE;
crom_add_entry(&sc->unit, DCONS_CSR_KEY_RESET_HI, ADDR_HI(idt_paddr));
crom_add_entry(&sc->unit, DCONS_CSR_KEY_RESET_LO, ADDR_LO(idt_paddr));
}
#endif
static void
dcons_crom_post_busreset(void *arg)
{
@ -128,6 +149,9 @@ dcons_crom_post_busreset(void *arg)
crom_add_simple_text(src, &sc->unit, &sc->ver, "dcons");
crom_add_entry(&sc->unit, DCONS_CSR_KEY_HI, ADDR_HI(dcons_paddr));
crom_add_entry(&sc->unit, DCONS_CSR_KEY_LO, ADDR_LO(dcons_paddr));
#if (defined(__i386__) || defined(__amd64__)) && defined(EXPOSE_IDT_ADDR)
dcons_crom_expose_idt(sc);
#endif
}
#endif