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+[[!meta copyright="Copyright © 2011, 2012, 2013, 2014 Free Software Foundation,
+Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+[[!tag open_issue_gnumach open_issue_mig]]
+
+There is a `master-x86_64` GNU Mach branch.  As of 2012-11-20, it only supports
+the [[microkernel/mach/gnumach/ports/Xen]] platform.
+
+
+# IRC, freenode, #hurd, 2011-10-16
+
+    <youpi> it'd be really good to have a 64bit kernel, no need to care about
+      addressing space :)
+    <braunr> yes a 64 bits kernel would be nice
+    <braunr> i guess it wouldn't be too hard to have a special mach kernel for
+      64 bits processors, but 32 bits userland only
+    <youpi> well, it means tinkering with mig
+
+[[mig_portable_rpc_declarations]].
+
+
+# IRC, freenode, #hurd, 2012-10-03
+
+    <braunr> youpi: just so you know in case you try the master-x86_64 with
+      grub
+    <braunr> youpi: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=689509
+    <youpi> ok, thx
+    <braunr> the squeeze version is fine but i had to patch the wheezy/sid one
+    <youpi> I actually hadn't hoped to boot into 64bit directly from grub
+    <braunr> youpi: there is code in viengoos that could be reused
+    <braunr> i've been thinking about it for a time now
+    <youpi> ok
+    <braunr> the two easiest ways are 1/ the viengoos one (a -m32 object file
+      converted with objcopy as an embedded loader)
+    <braunr> and 2/ establishing an identity mapping using 4x1 GB large pages
+      and switching to long mode, then jumping to c code to complete the
+      initialization
+    <braunr> i think i'll go the second way with x15, so you'll have the two :)
+
+
+## IRC, freenode, #hurd, 2013-07-02
+
+In context of [[mondriaan_memory_protection]].
+
+    <xscript> BTW, it's not like I have an infinite amount of time for this,
+      but having 64-bit support would be valuable for me, so I might contribute
+      that back if it's not a too monumental task
+    <xscript> I saw some discussions about 32bit apps on top of 64bit mach, but
+      I'd like a full 64bit system
+    <xscript> any clues?
+    <xscript> I suppose the compiler support is all there already
+    <xscript> is MIG (and mach) the only piece missing?
+    <braunr> the problem is the interfaces themselves
+    <braunr> type widths
+    <braunr> as passed between userspace and kernel
+
+
+## IRC, OFTC, #debian-hurd, 2013-10-05
+
+    <dharc> and what about 64 bit support, almost done?
+    <youpi> kernel part is done
+    <youpi> MIG 32/64 trnaslation missing
+
+[[mig_portable_rpc_declarations]].