Initial source

1 files changed, 70 insertions, 0 deletions

diff --git a/i386/util/cpu_tables_load.c b/i386/util/cpu_tables_load.c
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+++ b/i386/util/cpu_tables_load.c
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+/* 
+ * 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/proc_reg.h>
+
+#include "cpu.h"
+#include "vm_param.h"
+
+void cpu_tables_load(struct cpu *cpu)
+{
+	struct pseudo_descriptor pdesc;
+
+	/* Load the final GDT.
+	   If paging is now on,
+	   then this will point the processor to the GDT
+	   at its new linear address in the kernel linear space.  */
+	pdesc.limit = sizeof(cpu->tables.gdt)-1;
+	pdesc.linear_base = kvtolin(&cpu->tables.gdt);
+	set_gdt(&pdesc);
+
+	/* Reload all the segment registers from the new GDT.  */
+	asm volatile("
+		ljmp	%0,$1f
+	1:
+	" : : "i" (KERNEL_CS));
+	set_ds(KERNEL_DS);
+	set_es(KERNEL_DS);
+	set_fs(0);
+	set_gs(0);
+	set_ss(KERNEL_DS);
+
+	/* Load the IDT.  */
+	pdesc.limit = sizeof(cpu[0].tables.idt)-1;
+	pdesc.linear_base = kvtolin(&cpu->tables.idt);
+	set_idt(&pdesc);
+
+#ifdef DEFAULT_LDT
+	/* Load the default LDT.  */
+	set_ldt(DEFAULT_LDT);
+#endif
+
+#ifdef DEFAULT_TSS
+	/* Make sure it isn't marked busy.  */
+	cpu->tables.gdt[DEFAULT_TSS_IDX].access &= ~ACC_TSS_BUSY;
+
+	/* Load the default TSS.  */
+	set_tr(DEFAULT_TSS);
+#endif
+}
+