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 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * 26 * Copyright 2020 Joyent, Inc. 27 */ 28 29 30/* 31 * The boot GDT must remain in sync with the entries in intel/sys/segments.h; in 32 * particular kmdb uses B64CODE_SEL or B32CODE_SEL in perpetuity for its IDT 33 * entries (they're copied to the kernel's GDT in init_idt()). 34 * 35 * The GDT is effectively an array of user_desc_t entries. 36 */ 37 38 .align 16 39 .data 40 41global_descriptor_table: 42 .long 0 43 .long 0 44 45 /* GDT_B32DATA: 32 bit flat data descriptor */ 46 .value 0xFFFF /* segment limit 0..15 */ 47 .value 0x0000 /* segment base 0..15 */ 48 .byte 0x0 /* segment base 16..23 */ 49 .byte 0x92 /* P = 1, read/write data */ 50 .byte 0xCF /* G=1, B=1, Limit (16..19)=1111 */ 51 .byte 0x0 /* segment base 24..32 */ 52 53 /* GDT_B32CODE 32 bit flat code descriptor */ 54 .value 0xFFFF /* segment limit 0..15 */ 55 .value 0x0000 /* segment base 0..15 */ 56 .byte 0x0 /* segment base 16..23 */ 57 .byte 0x9A /* P=1, code, exec, readable */ 58 .byte 0xCF /* G=1, D=1, Limit (16..19)=1111 */ 59 .byte 0x0 /* segment base 24..32 */ 60 61 /* 62 * GDT_B16CODE 16 bit code descriptor for doing BIOS calls 63 */ 64 .value 0xFFFF /* segment limit 0..15 */ 65 .value 0x0000 /* segment base 0..15 */ 66 .byte 0x0 /* segment base 16..23 */ 67 .byte 0x9A /* P=1, code, exec, readable */ 68 .byte 0x0F /* G=0, D=0, Limit (16..19)=1111 */ 69 .byte 0x0 /* segment base 24..32 */ 70 71 /* 72 * GDT_B16DATA 16 bit data descriptor for doing BIOS calls 73 */ 74 .value 0xFFFF /* segment limit 0..15 */ 75 .value 0x0000 /* segment base 0..15 */ 76 .byte 0x0 /* segment base 16..23 */ 77 .byte 0x92 /* P = 1, read/write data */ 78 .byte 0x4F /* G=0, D=1, Limit (16..19)=1111 */ 79 .byte 0x0 /* segment base 24..32 */ 80 81 /* GDT_B64CODE: 64 bit flat code descriptor - only L bit has meaning */ 82 .value 0xFFFF /* segment limit 0..15 */ 83 .value 0x0000 /* segment base 0..15 */ 84 .byte 0x0 /* segment base 16..23 */ 85 .byte 0x9A /* P=1, code, exec, readable */ 86 .byte 0xAF /* G=1, D=0, L=1, Limit (16..19)=1111 */ 87 .byte 0x0 /* segment base 24..32 */ 88 89 /* 90 * unused 91 */ 92 .long 0 93 .long 0 94 95 /* 96 * GDT_BGSTMP -- an entry for kmdb to use during boot 97 * the fast reboot code uses this entry for memory copies, too. 98 */ 99 .value 0x0001 /* segment limit 0..15 */ 100 101 .globl fake_cpu_gdt_base_0_15 102fake_cpu_gdt_base_0_15: 103 104 .value 0x0000 /* segment base 0..15 */ 105 106 .globl fake_cpu_gdt_base_16_23 107fake_cpu_gdt_base_16_23: 108 .byte 0x0 /* segment base 16..23 */ 109 .byte 0x9A /* P=1, code, exec, readable */ 110 .byte 0xC0 /* G=1, D=1, Limit (16..19)=0000 */ 111 112 .globl fake_cpu_gdt_base_24_31 113fake_cpu_gdt_base_24_31: 114 .byte 0x0 /* segment base 24..32 */ 115 116/ .long 0 117/ .long 0 118 119 120/* 121 * This is a desctbr_t. 122 */ 123gdt_info: 124 .value gdt_info - global_descriptor_table - 1 125 .long global_descriptor_table 126 .long 0 /* needed for 64 bit */ 127 128fake_cpu: 129 .4byte 0 130 .4byte 0 131 .4byte 0 132 .globl fake_cpu_ptr 133fake_cpu_ptr: 134 .4byte 0 135 .skip 0x6c0, 0 136 137