1 files changed, 59 insertions, 0 deletions
diff --git a/i386/pc/real_tss.c b/i386/pc/real_tss.c
new file mode 100644
index 00000000..745a6113
--- /dev/null
+++ b/i386/pc/real_tss.c
@@ -0,0 +1,59 @@
+/* 
+ * Copyright (c) 1995-1994 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Bryan Ford, University of Utah CSL
+ */
+
+#include <mach/machine/tss.h>
+#include <mach/machine/proc_reg.h>
+
+#include "cpu.h"
+#include "real_tss.h"
+#include "vm_param.h"
+#include "config.h"
+
+#ifdef ENABLE_REAL_TSS
+
+static void real_tss_init()
+{
+	/* Only initialize once.  */
+	if (!real_tss.ss0)
+	{
+		/* Initialize the real-mode TSS.  */
+		real_tss.ss0 = KERNEL_DS;
+		real_tss.esp0 = get_esp();
+		real_tss.io_bit_map_offset = sizeof(real_tss);
+
+		/* Set the last byte in the I/O bitmap to all 1's.  */
+		((unsigned char*)&real_tss)[REAL_TSS_SIZE] = 0xff;
+	}
+}
+
+void
+cpu_gdt_init_REAL_TSS(struct cpu *cpu)
+{
+	real_tss_init();
+
+	fill_gdt_descriptor(cpu, REAL_TSS,
+			    kvtolin(&real_tss), REAL_TSS_SIZE-1,
+			    ACC_PL_K|ACC_TSS, 0);
+}
+
+#endif ENABLE_REAL_TSS