X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/91447636331957f3d9b5ca5b508f07c526b0074d..935ed37a5c468c8a1c07408573c08b8b7ef80e8b:/osfmk/i386/gdt.c

diff --git a/osfmk/i386/gdt.c b/osfmk/i386/gdt.c
index df29cf3a9..4150e7c0d 100644
--- a/osfmk/i386/gdt.c
+++ b/osfmk/i386/gdt.c
@@ -1,23 +1,29 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*
  * @OSF_COPYRIGHT@
@@ -60,65 +66,61 @@
 #include <i386/cpu_data.h>
 #include <i386/mp_desc.h>
 
-#ifdef	MACH_BSD
-extern int	trap_unix_syscall(void), trap_mach25_syscall(void),
-		trap_machdep_syscall(void), syscall(void);
-#endif
-
-struct fake_descriptor gdt[GDTSZ] = {
-/* 0x000 */	{ 0, 0, 0, 0 },		/* always NULL */
-/* 0x008 */	{ 0,
+struct fake_descriptor master_gdt[GDTSZ] __attribute__ ((aligned (4096))) = {
+	[SEL_TO_INDEX(KERNEL_CS)] {	/* kernel code */
+		0,
 		  0xfffff,
 		  SZ_32|SZ_G,
-		  ACC_P|ACC_PL_K|ACC_CODE_R
-		},			/* kernel code */
-/* 0x010 */	{ 0,
+		ACC_P|ACC_PL_K|ACC_CODE_R,
+	},
+	[SEL_TO_INDEX(KERNEL_DS)] {	/* kernel data */
+		0,
 		  0xfffff,
 		  SZ_32|SZ_G,
 		  ACC_P|ACC_PL_K|ACC_DATA_W
-		},			/* kernel data */
-/* 0x018 */	{ (unsigned int)ldt,
-		  LDTSZ*sizeof(struct fake_descriptor)-1,
+	},
+	[SEL_TO_INDEX(KERNEL_LDT)] {	/* local descriptor table */
+		(uint32_t) &master_ldt,
+		  LDTSZ_MIN*sizeof(struct fake_descriptor)-1,
 		  0,
 		  ACC_P|ACC_PL_K|ACC_LDT
-		},			/* local descriptor table */
-/* 0x020 */	{ (unsigned int)&ktss,
+	},				/* The slot KERNEL_LDT_2 is reserved. */
+	[SEL_TO_INDEX(KERNEL_TSS)] {	/* TSS for this processor */
+		(uint32_t) &master_ktss,
 		  sizeof(struct i386_tss)-1,
 		  0,
 		  ACC_P|ACC_PL_K|ACC_TSS
-		},			/* TSS for this processor */
-#ifdef	MACH_BSD
-/* 0x28 */	{ (unsigned int) &trap_unix_syscall,
-		   KERNEL_CS,
-		   0,				/* no parameters */
-		   ACC_P|ACC_PL_U|ACC_CALL_GATE
-		},
-/* 0x30 */	{ (unsigned int) &trap_mach25_syscall,
-		   KERNEL_CS,
-		   0,				/* no parameters */
-		   ACC_P|ACC_PL_U|ACC_CALL_GATE
-		},
-/* 0x38 */	{ (unsigned int) &trap_machdep_syscall,
-		   KERNEL_CS,
-		   0,				/* no parameters */
-		   ACC_P|ACC_PL_U|ACC_CALL_GATE
-		},
-#else
-/* 0x028 */	{ 0, 0, 0, 0 },		/* per-thread LDT */
-/* 0x030 */	{ 0, 0, 0, 0 },		/* per-thread TSS for IO bitmap */
-/* 0x038 */	{ 0, 0, 0, 0 },
-#endif
-/* 0x040 */	{ 0, 0, 0, 0 },
-/* 0x048 */	{ (unsigned int)&cpu_data_master,
+	},				/* The slot KERNEL_TSS_2 is reserved. */
+	[SEL_TO_INDEX(CPU_DATA_GS)] {	/* per-CPU current thread address */
+		(uint32_t) &cpu_data_master,
 		  sizeof(cpu_data_t)-1,
 		  SZ_32,
 		  ACC_P|ACC_PL_K|ACC_DATA_W
-		},			/* per-CPU current thread address */
+	},
+	[SEL_TO_INDEX(USER_LDT)] {	/* user local descriptor table */
+		(uint32_t) &master_ldt,
+		  LDTSZ_MIN*sizeof(struct fake_descriptor)-1,
+		  0,
+		  ACC_P|ACC_PL_K|ACC_LDT
+	},
+	[SEL_TO_INDEX(KERNEL64_CS)] {	/* kernel 64-bit code */ 
+		0,
+		0xfffff,
+		SZ_64|SZ_G,
+		ACC_P|ACC_PL_K|ACC_CODE_R
+	},
+	[SEL_TO_INDEX(KERNEL64_SS)] {	/* kernel 64-bit syscall stack */ 
+		0,
+		0xfffff,
+		SZ_32|SZ_G,
+		ACC_P|ACC_PL_K|ACC_DATA_W
+	},
 #if	MACH_KDB
-/* 0x050 */	{ (unsigned int)&dbtss,
+	[SEL_TO_INDEX(DEBUG_TSS)] {	/* TSS for this processor */
+		(uint32_t)&master_dbtss,
 		  sizeof(struct i386_tss)-1,
 		  0,
 		  ACC_P|ACC_PL_K|ACC_TSS
-		}			/* TSS for this processor */
+	},
 #endif	/* MACH_KDB */
 };