1 files changed, 117 insertions, 0 deletions
diff --git a/i386/i386/ldt.c b/i386/i386/ldt.c
new file mode 100644
index 0000000..5db3642
--- /dev/null
+++ b/i386/i386/ldt.c
@@ -0,0 +1,117 @@
+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * "Local" descriptor table.  At the moment, all tasks use the
+ * same LDT.
+ */
+#include <mach/machine/eflags.h>
+#include <mach/machine/vm_types.h>
+#include <mach/xen.h>
+
+#include <intel/pmap.h>
+#include <kern/debug.h>
+
+#include "vm_param.h"
+#include "seg.h"
+#include "gdt.h"
+#include "ldt.h"
+#include "locore.h"
+#include "mp_desc.h"
+#include "msr.h"
+
+#ifdef	MACH_PV_DESCRIPTORS
+/* It is actually defined in xen_boothdr.S */
+extern
+#endif	/* MACH_PV_DESCRIPTORS */
+struct real_descriptor ldt[LDTSZ];
+
+#if defined(__x86_64__) && ! defined(USER32)
+#define USER_SEGMENT_SIZEBITS SZ_64
+#else
+#define USER_SEGMENT_SIZEBITS SZ_32
+#endif
+
+void
+ldt_fill(struct real_descriptor *myldt, struct real_descriptor *mygdt)
+{
+#ifdef	MACH_PV_DESCRIPTORS
+#ifdef	MACH_PV_PAGETABLES
+	pmap_set_page_readwrite(myldt);
+#endif	/* MACH_PV_PAGETABLES */
+#else	/* MACH_PV_DESCRIPTORS */
+	/* Initialize the master LDT descriptor in the GDT.  */
+	_fill_gdt_sys_descriptor(mygdt, KERNEL_LDT,
+			        kvtolin(myldt), (LDTSZ * sizeof(struct real_descriptor))-1,
+			        ACC_PL_K|ACC_LDT, 0);
+#endif	/* MACH_PV_DESCRIPTORS */
+
+	/* Initialize the syscall entry point */
+#if defined(__x86_64__) && ! defined(USER32)
+        if (!CPU_HAS_FEATURE(CPU_FEATURE_SEP))
+            panic("syscall support is missing on 64 bit");
+        /* Enable 64-bit syscalls */
+        wrmsr(MSR_REG_EFER, rdmsr(MSR_REG_EFER) | MSR_EFER_SCE);
+        wrmsr(MSR_REG_LSTAR, (vm_offset_t)syscall64);
+        wrmsr(MSR_REG_STAR, ((((long)USER_CS - 16) << 16) | (long)KERNEL_CS) << 32);
+        wrmsr(MSR_REG_FMASK, EFL_IF | EFL_IOPL_USER);
+#else /* defined(__x86_64__) && ! defined(USER32) */
+	fill_ldt_gate(myldt, USER_SCALL,
+		      (vm_offset_t)&syscall, KERNEL_CS,
+		      ACC_PL_U|ACC_CALL_GATE, 0);
+#endif /* defined(__x86_64__) && ! defined(USER32) */
+
+	/* Initialize the 32bit LDT descriptors.  */
+	fill_ldt_descriptor(myldt, USER_CS,
+			    VM_MIN_USER_ADDRESS,
+			    VM_MAX_USER_ADDRESS-VM_MIN_USER_ADDRESS-4096,
+			    /* XXX LINEAR_... */
+			    ACC_PL_U|ACC_CODE_R, USER_SEGMENT_SIZEBITS);
+	fill_ldt_descriptor(myldt, USER_DS,
+			    VM_MIN_USER_ADDRESS,
+			    VM_MAX_USER_ADDRESS-VM_MIN_USER_ADDRESS-4096,
+			    ACC_PL_U|ACC_DATA_W, USER_SEGMENT_SIZEBITS);
+
+	/* Activate the LDT.  */
+#ifdef	MACH_PV_DESCRIPTORS
+	hyp_set_ldt(myldt, LDTSZ);
+#else	/* MACH_PV_DESCRIPTORS */
+	lldt(KERNEL_LDT);
+#endif	/* MACH_PV_DESCRIPTORS */
+}
+
+void
+ldt_init(void)
+{
+	ldt_fill(ldt, gdt);
+}
+
+#if NCPUS > 1
+void
+ap_ldt_init(int cpu)
+{
+	ldt_fill(mp_desc_table[cpu]->ldt, mp_gdt[cpu]);
+}
+#endif