/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright 2019 Joyent, Inc.
 */

#ifndef _SYS_ASM_MISC_H
#define _SYS_ASM_MISC_H

#ifdef  __cplusplus
extern "C" {
#endif

#define RET_INSTR       0xc3
#define NOP_INSTR       0x90
#define STI_INSTR       0xfb
#define JMP_INSTR       0x00eb

#ifdef _ASM     /* The remainder of this file is only for assembly files */

/* Load reg with pointer to per-CPU structure */
#if defined(__amd64)
#define LOADCPU(reg)                    \
        movq    %gs:CPU_SELF, reg;
#else
#define LOADCPU(reg)                    \
        movl    %gs:CPU_SELF, reg;
#endif

#if defined(__i386)

#define _HOT_PATCH_PROLOG                       \
        push    %ebp;                           \
        mov     %esp, %ebp;                     \
        push    %ebx;                           \
        push    %esi;                           \
        push    %edi

#define _HOT_PATCH(srcaddr, dstaddr, size)      \
        movl    $srcaddr, %esi;                 \
        movl    $dstaddr, %edi;                 \
        movl    $size, %ebx;                    \
0:      pushl   $1;                             \
        /*CSTYLED*/                             \
        movzbl  (%esi), %eax;                   \
        pushl   %eax;                           \
        pushl   %edi;                           \
        call    hot_patch_kernel_text;          \
        addl    $12, %esp;                      \
        inc     %edi;                           \
        inc     %esi;                           \
        dec     %ebx;                           \
        test    %ebx, %ebx;                     \
        jne     0b

#define _HOT_PATCH_EPILOG                       \
        pop     %edi;                           \
        pop     %esi;                           \
        pop     %ebx;                           \
        mov     %ebp, %esp;                     \
        pop     %ebp

#endif  /* __i386 */

#endif /* _ASM */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_ASM_MISC_H */