/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright 2019 Joyent, Inc.
 * Copyright 2022 Oxide Computer Company
 */

#include <sys/asm_linkage.h>
#include <sys/asm_misc.h>
#include <sys/regset.h>
#include <sys/panic.h>
#include <sys/ontrap.h>
#include <sys/privregs.h>
#include <sys/segments.h>
#include <sys/trap.h>

#include "assym.h"

        ENTRY_NP(rd_idtr)
        sidt    (%rdi)
        ret
        SET_SIZE(rd_idtr)

        ENTRY_NP(wr_idtr)
        lidt    (%rdi)
        ret
        SET_SIZE(wr_idtr)

        ENTRY_NP(rd_gdtr)
        pushq   %rbp
        movq    %rsp, %rbp
        sgdt    (%rdi)
        leave
        ret
        SET_SIZE(rd_gdtr)

        ENTRY_NP(wr_gdtr)
        pushq   %rbp
        movq    %rsp, %rbp
        lgdt    (%rdi)
        leave
        ret
        SET_SIZE(wr_gdtr)

        /*
         * loads zero selector for ds and es.
         */
        ENTRY_NP(load_segment_registers)
        pushq   %rbp
        movq    %rsp, %rbp
        pushq   %rdi
        pushq   $.newcs
        lretq
.newcs:
        /*
         * zero %ds and %es - they're ignored anyway
         */
        xorl    %eax, %eax
        movw    %ax, %ds
        movw    %ax, %es
        movl    %esi, %eax
        movw    %ax, %fs
        movl    %edx, %eax
        movw    %ax, %gs
        movl    %ecx, %eax
        movw    %ax, %ss
        leave
        ret
        SET_SIZE(load_segment_registers)

        ENTRY_NP(get_cs_register)
        movq    %cs, %rax
        ret
        SET_SIZE(get_cs_register)

        ENTRY_NP(wr_ldtr)
        movq    %rdi, %rax
        lldt    %ax
        ret
        SET_SIZE(wr_ldtr)

        ENTRY_NP(rd_ldtr)
        xorl    %eax, %eax
        sldt    %ax
        ret
        SET_SIZE(rd_ldtr)

        ENTRY_NP(wr_tsr)
        movq    %rdi, %rax
        ltr     %ax
        ret
        SET_SIZE(wr_tsr)