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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright 2020 Joyent, Inc.
* Copyright 2022 Oxide Computer Company
*/
/*
* The boot GDT must remain in sync with the entries in intel/sys/segments.h; in
* particular kmdb uses B64CODE_SEL or B32CODE_SEL in perpetuity for its IDT
* entries (they're copied to the kernel's GDT in init_idt()).
*
* The GDT is effectively an array of user_desc_t entries.
*/
.align 16
.data
global_descriptor_table:
.long 0
.long 0
/* GDT_B32DATA: 32 bit flat data descriptor */
.value 0xFFFF /* segment limit 0..15 */
.value 0x0000 /* segment base 0..15 */
.byte 0x0 /* segment base 16..23 */
.byte 0x92 /* P = 1, read/write data */
.byte 0xCF /* G=1, B=1, Limit (16..19)=1111 */
.byte 0x0 /* segment base 24..32 */
/* GDT_B32CODE 32 bit flat code descriptor */
.value 0xFFFF /* segment limit 0..15 */
.value 0x0000 /* segment base 0..15 */
.byte 0x0 /* segment base 16..23 */
.byte 0x9A /* P=1, code, exec, readable */
.byte 0xCF /* G=1, D=1, Limit (16..19)=1111 */
.byte 0x0 /* segment base 24..32 */
/*
* GDT_B16CODE 16 bit code descriptor for doing BIOS calls
*/
.value 0xFFFF /* segment limit 0..15 */
.value 0x0000 /* segment base 0..15 */
.byte 0x0 /* segment base 16..23 */
.byte 0x9A /* P=1, code, exec, readable */
.byte 0x0F /* G=0, D=0, Limit (16..19)=1111 */
.byte 0x0 /* segment base 24..32 */
/*
* GDT_B16DATA 16 bit data descriptor for doing BIOS calls
* XXX: Note that this sets the B flag, which is not supposed to be
* set for a 16-bit data segment that is not expand-down (Intel SDM
* vol 3A sec 3.4.5). AMD does not seem to care (AMD APM vol 2 sec
* 2.7.4). It is likely this is here for use with stack segments,
* where it effects 32-bit operations. Conceivably, we could be more
* conservative and specify a 16-bit stack segment, but leave it for
* now.
*/
.value 0xFFFF /* segment limit 0..15 */
.value 0x0000 /* segment base 0..15 */
.byte 0x0 /* segment base 16..23 */
.byte 0x92 /* P = 1, read/write data */
.byte 0x4F /* G=0, B=1, Limit (16..19)=1111 */
.byte 0x0 /* segment base 24..32 */
/* GDT_B64CODE: 64 bit flat code descriptor - only L bit has meaning */
.value 0xFFFF /* segment limit 0..15 */
.value 0x0000 /* segment base 0..15 */
.byte 0x0 /* segment base 16..23 */
.byte 0x9A /* P=1, code, exec, readable */
.byte 0xAF /* G=1, D=0, L=1, Limit (16..19)=1111 */
.byte 0x0 /* segment base 24..32 */
/*
* unused
*/
.long 0
.long 0
/*
* GDT_BGSTMP -- an entry for kmdb to use during boot
* the fast reboot code uses this entry for memory copies, too.
*/
.value 0x0001 /* segment limit 0..15 */
.globl fake_cpu_gdt_base_0_15
fake_cpu_gdt_base_0_15:
.value 0x0000 /* segment base 0..15 */
.globl fake_cpu_gdt_base_16_23
fake_cpu_gdt_base_16_23:
.byte 0x0 /* segment base 16..23 */
.byte 0x9A /* P=1, code, exec, readable */
.byte 0xC0 /* G=1, D=1, Limit (16..19)=0000 */
.globl fake_cpu_gdt_base_24_31
fake_cpu_gdt_base_24_31:
.byte 0x0 /* segment base 24..32 */
/ .long 0
/ .long 0
/*
* This is a desctbr_t.
*/
gdt_info:
.value gdt_info - global_descriptor_table - 1
.long global_descriptor_table
.long 0 /* needed for 64 bit */
fake_cpu:
.4byte 0
.4byte 0
.4byte 0
.globl fake_cpu_ptr
fake_cpu_ptr:
.4byte 0
.skip 0x6c0, 0
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