Date: Fri, 07 Apr 2000 04:58:23 +0900 From: Mitsuru IWASAKI <iwasaki@jp.FreeBSD.org> To: imp@village.org Cc: iwasaki@jp.FreeBSD.org, nate@yogotech.com, freebsd-mobile@FreeBSD.ORG Subject: Re: Call for review: restart pccardd by SIGHUP Message-ID: <200004061958.EAA15431@tasogare.imasy.or.jp> In-Reply-To: Your message of "Thu, 06 Apr 2000 12:37:08 -0600" <200004061837.MAA92697@harmony.village.org> References: <200004061837.MAA92697@harmony.village.org>
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> OK. This won't take into account device drivers that are loaded after
> pccardd gets into information, but will likely be enough to do the
> right thing.
>
> Hmmm, thinking in API terms...
>
> struct resource_usage {
> long base; // Base of resource to query
> long length; // Length of resource
> int type; // Type of resource
> u_int8_t *map; // Map of resources in use.
> }
Great!
> You'd pass the base (0x240 in your example), the length (0x1bf) and
> the type SYS_RES_IOPORT if that's visible to userland. map would
> point to an area that is at least 0x1bf bits long (or 56 bytes). Bits
> in this range would be set when that resource is in use. You could
OK, I can check map[i] != 0 if the resource is in use for each
8 bytes address.
> also get IRQs this way, which is bar far the most useful thing to do.
>
> Hmmm, come to think of it, you could use this just before allocating
> resources to the card too if you wanted to. It would be the most
> flexible way to deal :-).
Maybe we can get away from resource management in pccardd eventually :)
> BTW, on the topic of IRQs, I have two questions. How would you feel
> about making the default behavior of the pcic device to be polling
> rather than using an interrupt. This is a simple change to the config
> file. It should help on installations. Second, I'd like make the
I prefer polling mode because it works in most of cases and user can
change to use interrupt easily by UserConfig or loader command. I'm
having `device pcic0 at isa? irq 0' line in my config file for a long time.
> default for the pcic to *NOT* share interrupts. You'd have to set a
> flag in the device to enable it. This will also help people get
> things setup correctly.
I'm not sure about this, but I believe you :)
> I know that the default polling is dangarous because it increases the
> window of system hangs, but for system installs, this won't matter
> because one generally doesn't pull the plug and expect things to work
> :-)
I'm using my development laptop in polling mode, but no serious
problems so far in spite of hard testing :-)
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