On Wed, Oct 10, 2001 at 06:46:22PM -0400, Roland McGrath wrote:
> gnumach is never going to have SMP support anyway, so it's all moot (and
> the macros you are using expand to empty). In oskit-mach, I think we
> should get rid of the lookup table and just hang the data directly off the
> device_t.
That's okay by me, but I looked at the code now and it's not trivial.
The whole purpose of re-using devices requires that dev_open_alloc works for
us. This allocates a new struct device in the device zone, which has a
fixed size. So I guess we could make room in the zone for us (pass a larger
size than sizeof(struct device) to zinit), or we make use of space in struct
device_t itself. There seems to be enough room in the union for example.
I guess I can just use the following:
struct io_perm
union
{
struct device dev;
struct io_perm_range
{
char [offsetof (struct device) - offsetof (struct device, com)];
unsigned short from, to;
} range;
};
Is there an easy way to check at compile time that the size doesn't exceed
sizeof(struct device) at *compile* time? (cpp can't do it, but gcc has all
the necessary information).
Thanks,
Marcus
--
`Rhubarb is no Egyptian god.' Debian http://www.debian.org [EMAIL PROTECTED]
Marcus Brinkmann GNU http://www.gnu.org [EMAIL PROTECTED]
[EMAIL PROTECTED]
http://www.marcus-brinkmann.de
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