Cleanup of the d_mmap_t interface.

- Get rid of the useless atop() / pmap_phys_address() detour.  The
  device mmap handlers must now give back the physical address
  without atop()'ing it.
- Don't borrow the physical address of the mapping in the returned
  int.  Now we properly pass a vm_offset_t * and expect it to be
  filled by the mmap handler when the mapping was successful.  The
  mmap handler must now return 0 when successful, any other value
  is considered as an error.  Previously, returning -1 was the only
  way to fail.  This change thus accidentally fixes some devices
  which were bogusly returning errno constants which would have been
  considered as addresses by the device pager.
- Garbage collect the poorly named pmap_phys_address() now that it's
  no longer used.
- Convert all the d_mmap_t consumers to the new API.

I'm still not sure wheter we need a __FreeBSD_version bump for this,
since and we didn't guarantee API/ABI stability until 5.1-RELEASE.

Discussed with:		alc, phk, jake
Reviewed by:		peter
Compile-tested on:	LINT (i386), GENERIC (alpha and sparc64)
Runtime-tested on:	i386

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/sys/linedisc.h b/sys/sys/linedisc.h
index 10d09d95b769..7be960f48b7d 100644
--- a/sys/sys/linedisc.h
+++ b/sys/sys/linedisc.h
@@ -157,7 +157,8 @@ typedef int d_read_t(dev_t dev, struct uio *uio, int ioflag);
 typedef int d_write_t(dev_t dev, struct uio *uio, int ioflag);
 typedef int d_poll_t(dev_t dev, int events, struct thread *td);
 typedef int d_kqfilter_t(dev_t dev, struct knote *kn);
-typedef int d_mmap_t(dev_t dev, vm_offset_t offset, int nprot);
+typedef int d_mmap_t(dev_t dev, vm_offset_t offset, vm_offset_t *paddr,
+   		     int nprot);
 
 typedef int l_open_t(dev_t dev, struct tty *tp);
 typedef int l_close_t(struct tty *tp, int flag);