Author: cperciva
Date: Fri Dec 31 17:42:25 2010
New Revision: 216847
URL: http://svn.freebsd.org/changeset/base/216847
Log:
Make i386_set_ldt work on i386/XEN, step 5/5.
When cleaning up a thread, reset its LDT to the default LDT.
Note: Casting the LDT pointer to an int and storing it in pc_currentldt is
wildly bogus, but is harmless since pc_currentldt is a write-only variable.
MFC after: 3 days
Modified:
head/sys/i386/i386/sys_machdep.c
head/sys/i386/include/segments.h
Modified: head/sys/i386/i386/sys_machdep.c
==============================================================================
--- head/sys/i386/i386/sys_machdep.c Fri Dec 31 17:41:14 2010
(r216846)
+++ head/sys/i386/i386/sys_machdep.c Fri Dec 31 17:42:25 2010
(r216847)
@@ -523,8 +523,13 @@ user_ldt_free(struct thread *td)
}
if (td == PCPU_GET(curthread)) {
+#ifdef XEN
+ i386_reset_ldt(&default_proc_ldt);
+ PCPU_SET(currentldt, (int)&default_proc_ldt);
+#else
lldt(_default_ldt);
PCPU_SET(currentldt, _default_ldt);
+#endif
}
mdp->md_ldt = NULL;
Modified: head/sys/i386/include/segments.h
==============================================================================
--- head/sys/i386/include/segments.h Fri Dec 31 17:41:14 2010
(r216846)
+++ head/sys/i386/include/segments.h Fri Dec 31 17:42:25 2010
(r216847)
@@ -257,6 +257,7 @@ struct region_descriptor {
#ifdef _KERNEL
extern int _default_ldt;
#ifdef XEN
+extern struct proc_ldt default_proc_ldt;
extern union descriptor *gdt;
extern union descriptor *ldt;
#else
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