Date: Sat, 30 Nov 1996 20:36:56 -0700 From: "Mike Durian" <durian@plutotech.com> To: freebsd-hackers@freebsd.org Subject: LKM driver question / patch Message-ID: <199612010336.UAA09679@pluto.plutotech.com>
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First of all I have a patch for kern/kern_conf.c. Without this, you
get a panic when you try to unload a driver module:
*** kern_conf.c.orig Sat Nov 30 20:15:06 1996
--- kern_conf.c Sat Nov 30 19:00:58 1996
***************
*** 150,156 ****
if (oldentry) { \
*oldentry = TTYPE[i]; \
} \
! newentry->d_maj = i; \
/* replace with new */ \
TTYPE[i] = newentry; \
\
--- 150,157 ----
if (oldentry) { \
*oldentry = TTYPE[i]; \
} \
! if (newentry != NULL) \
! newentry->d_maj = i; \
/* replace with new */ \
TTYPE[i] = newentry; \
\
Second, I have a question on writing a lkm driver. What is the proper
way to use ISA an lkm driver with interrupts? The existing drivers in
sys/i386/isa don't use interrupt, or only use them in conjuction with
other existing hardware.
I've added the:
INTRMASK
register_intr
INTREN
code sequence as found in isa.c to my driver load routine, but
register_intr fails with EBUSY because the interrupt is already
assigned to isa_strayintr.
Also, how should I unregister the interrupt when I unload the driver?
I see code in isa.c that does:
INTRDIS
unregister_intr
INTRUNMASK
but it fails too (probably because it never got registered properly).
In fact it ends up masking my SCSI interrupts and I get aborts and
must reboot.
Thanks,
mike
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