svn commit: r327932 - head/sys/x86/include

[Conrad Meyer]

Author: cem
Date: Sat Jan 13 17:55:22 2018
New Revision: 327932
URL: https://svnweb.freebsd.org/changeset/base/327932

Log:
  amd64: Add a 48-bit MAXADDR constant
  
  Some devices (e.g., ccp(4) -- to be committed) can only access the low 48
  bits of physical memory.
  
  Reviewed by:	markj
  Sponsored by:	Dell EMC Isilon

Modified:
  head/sys/x86/include/bus.h

Modified: head/sys/x86/include/bus.h
==============================================================================
--- head/sys/x86/include/bus.h	Sat Jan 13 17:52:55 2018	(r327931)
+++ head/sys/x86/include/bus.h	Sat Jan 13 17:55:22 2018	(r327932)
@@ -118,6 +118,7 @@
 #define BUS_SPACE_MAXADDR_24BIT	0xFFFFFF
 #define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
 #if defined(__amd64__) || defined(PAE)
+#define BUS_SPACE_MAXADDR_48BIT	0xFFFFFFFFFFFFULL
 #define BUS_SPACE_MAXADDR	0xFFFFFFFFFFFFFFFFULL
 #else
 #define BUS_SPACE_MAXADDR	0xFFFFFFFF