svn commit: r318761 - in head/sys: i386/i386 x86/include

[John Baldwin]

Author: jhb
Date: Tue May 23 22:34:18 2017
New Revision: 318761
URL: https://svnweb.freebsd.org/changeset/base/318761

Log:
  Remove the BSD/OS 2.1 system call gate LDT entry.
  
  An extra copy of the system call gate was added to the default LDT back
  in 1996 (r18513 / r18514).  However, the ability to run BSD/OS 2.1
  i386 binaries under FreeBSD's native ABI is most likely no longer
  needed.
  
  Discussed with:	kib

Modified:
  head/sys/i386/i386/machdep.c
  head/sys/x86/include/segments.h

Modified: head/sys/i386/i386/machdep.c
==============================================================================
--- head/sys/i386/i386/machdep.c	Tue May 23 22:30:15 2017	(r318760)
+++ head/sys/i386/i386/machdep.c	Tue May 23 22:34:18 2017	(r318761)
@@ -2446,10 +2446,6 @@ init386(int first)
 	gdp->gd_p = 1;
 	gdp->gd_hioffset = x >> 16;
 
-	/* XXX does this work? */
-	/* XXX yes! */
-	ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL];
-
 	/* transfer to user mode */
 
 	_ucodesel = GSEL(GUCODE_SEL, SEL_UPL);

Modified: head/sys/x86/include/segments.h
==============================================================================
--- head/sys/x86/include/segments.h	Tue May 23 22:30:15 2017	(r318760)
+++ head/sys/x86/include/segments.h	Tue May 23 22:34:18 2017	(r318761)
@@ -252,8 +252,7 @@ union descriptor {
 #define	LUDATA_SEL	5
 /* separate stack, es,fs,gs sels ? */
 /* #define	LPOSIXCALLS_SEL	5*/	/* notyet */
-#define	LBSDICALLS_SEL	16	/* BSDI system call gate */
-#define	NLDT		(LBSDICALLS_SEL + 1)
+#define	NLDT		(LUDATA_SEL + 1)
 
 #else /* !__i386__ */
 /*