Justus Winter, le Tue 01 Jul 2014 11:37:03 +0200, a écrit :
> Also, I'm not convinced that undoing the mappings is
> necessary, as we're shutting down the system.
Well, for that use of the io_map_cached function, yes, but you never
know who will want to call that function in the future, e.g. for A
Quoting Samuel Thibault (2014-07-01 11:26:19)
> Justus Winter, le Tue 01 Jul 2014 11:22:38 +0200, a écrit :
> > I don't believe one knows the size in advance.
>
> In advance, no, but
>
> > Every acpi table has a header with explicit size information.
>
> Once you can read this, you can know the
Justus Winter, le Tue 01 Jul 2014 11:22:38 +0200, a écrit :
> I don't believe one knows the size in advance.
In advance, no, but
> Every acpi table has a header with explicit size information.
Once you can read this, you can know the size and can remap, can't you?
Samuel
Quoting Samuel Thibault (2014-05-23 01:28:30)
> Justus Winter, le Thu 15 May 2014 12:32:41 +0200, a écrit :
> > Quoting Samuel Thibault (2014-05-15 02:13:13)
> > > Justus Winter, le Fri 02 May 2014 21:33:01 +0200, a écrit :
> > > > io_map_cached is like io_map, but reuses the old mapping if it is
>
Justus Winter, le Thu 15 May 2014 12:32:41 +0200, a écrit :
> Quoting Samuel Thibault (2014-05-15 02:13:13)
> > Justus Winter, le Fri 02 May 2014 21:33:01 +0200, a écrit :
> > > io_map_cached is like io_map, but reuses the old mapping if it is
> > > applicable.
> >
> > But AIUI, if it is not appli
Justus Winter, le Thu 15 May 2014 12:32:41 +0200, a écrit :
> accessing this physical address with phystokv() fails b/c it is
> outside the mapped range
Ah, right, I guess it's in very high addresses.
Samuel
Quoting Samuel Thibault (2014-05-15 02:13:13)
> Hello,
>
> Justus Winter, le Fri 02 May 2014 21:33:01 +0200, a écrit :
> > io_map_cached is like io_map, but reuses the old mapping if it is
> > applicable.
>
> But AIUI, if it is not applicable, it does not unmap the previous
> mapping, so we lose
Hello,
Justus Winter, le Fri 02 May 2014 21:33:01 +0200, a écrit :
> io_map_cached is like io_map, but reuses the old mapping if it is
> applicable.
But AIUI, if it is not applicable, it does not unmap the previous
mapping, so we lose virtual memory.
A really transparent io_map_cached seems not
io_map_cached is like io_map, but reuses the old mapping if it is
applicable.
* i386/i386/io_map.c: Add io_map_cached.
---
i386/i386/io_map.c | 29 +
1 file changed, 29 insertions(+)
diff --git a/i386/i386/io_map.c b/i386/i386/io_map.c
index 74e0b47..03d7152 100644
--
