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, 6 insertions, 3 deletions

diff --git a/sys/amd64/amd64/mem.c b/sys/amd64/amd64/mem.c
index 41fa636..a045d96 100644
--- a/sys/amd64/amd64/mem.c
+++ b/sys/amd64/amd64/mem.c
@@ -215,22 +215,25 @@ mmrw(dev_t dev, struct uio *uio, int flags)
 * instead of going through read/write			*
 \*******************************************************/
 static int
-memmmap(dev_t dev, vm_offset_t offset, int prot)
+memmmap(dev_t dev, vm_offset_t offset, vm_offset_t *paddr, int prot)
 {
 	switch (minor(dev))
 	{
 
 	/* minor device 0 is physical memory */
 	case 0:
-        	return (i386_btop(offset));
+		*paddr = offset;
+		break;
 
 	/* minor device 1 is kernel memory */
 	case 1:
-        	return (i386_btop(vtophys(offset)));
+        	*paddr = vtophys(offset);
+		break;
 
 	default:
 		return (-1);
 	}
+	return (0);
 }
 
 /*