1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27#pragma ident "%Z%%M% %I% %E% SMI" 28 29#if defined(__lint) 30#pragma pack(1) 31struct { 32 uint16_t limit_low; 33 uint16_t base_low; 34 uint8_t base_middle; 35 uint8_t attr; 36 uint8_t attr_and_limit; 37 uint8_t base_high; 38} global_descriptor_table[8]; 39struct { 40 uint16_t limit; /* sizeof (global_descriptor_table) - 1 */ 41 void *base; /* &global_descriptor_table */ 42} gdt_info; 43#pragma pack() 44 45#else /* __lint */ 46 47 .align 16 48 49 /* 50 * This must remain in sync with the entries in intel/sys/gdt.h; in 51 * particular kmdb uses B64CODE_SEL or B32CODE_SEL in perpetuity for 52 * its IDT entries (they're copied to the kernel's GDT in init_idt()). 53 */ 54 55global_descriptor_table: 56 .long 0 57 .long 0 58 59 /* GDT_B32DATA: 32 bit flat data descriptor */ 60 .value 0xFFFF /* segment limit 0..15 */ 61 .value 0x0000 /* segment base 0..15 */ 62 .byte 0x0 /* segment base 16..23 */ 63 .byte 0x92 /* P = 1, read/write data */ 64 .byte 0xCF /* G=1, B=1, Limit (16..19)=1111 */ 65 .byte 0x0 /* segment base 24..32 */ 66 67 /* GDT_B32CODE 32 bit flat code descriptor */ 68 .value 0xFFFF /* segment limit 0..15 */ 69 .value 0x0000 /* segment base 0..15 */ 70 .byte 0x0 /* segment base 16..23 */ 71 .byte 0x9E /* P=1, code, exec, readable */ 72 .byte 0xCF /* G=1, D=1, Limit (16..19)=1111 */ 73 .byte 0x0 /* segment base 24..32 */ 74 75 /* 76 * GDT_B16CODE 16 bit code descriptor for doing BIOS calls 77 */ 78 .value 0xFFFF /* segment limit 0..15 */ 79 .value 0x0000 /* segment base 0..15 */ 80 .byte 0x0 /* segment base 16..23 */ 81 .byte 0x9E /* P=1, code, exec, readable */ 82 .byte 0x0F /* G=0, D=0, Limit (16..19)=1111 */ 83 .byte 0x0 /* segment base 24..32 */ 84 85 /* 86 * GDT_B16DATA 16 bit data descriptor for doing BIOS calls 87 */ 88 .value 0xFFFF /* segment limit 0..15 */ 89 .value 0x0000 /* segment base 0..15 */ 90 .byte 0x0 /* segment base 16..23 */ 91 .byte 0x92 /* P = 1, read/write data */ 92 .byte 0x4F /* G=0, D=1, Limit (16..19)=1111 */ 93 .byte 0x0 /* segment base 24..32 */ 94 95 /* GDT_B64CODE: 64 bit flat code descriptor - only L bit has meaning */ 96 .value 0xFFFF /* segment limit 0..15 */ 97 .value 0x0000 /* segment base 0..15 */ 98 .byte 0x0 /* segment base 16..23 */ 99 .byte 0x9E /* P=1, code, exec, readable */ 100 .byte 0xAF /* G=1, D=0, L=1, Limit (16..19)=1111 */ 101 .byte 0x0 /* segment base 24..32 */ 102 103 /* 104 * unused 105 */ 106 .long 0 107 .long 0 108 109 /* 110 * GDT_BGSTMP -- an entry for kmdb to use during boot 111 */ 112 .long 0 113 .long 0 114 115gdt_info: 116 .value gdt_info - global_descriptor_table - 1 117 .long global_descriptor_table 118 .long 0 /* needed for 64 bit */ 119 120#endif /* __lint */ 121