This is xnu-8019. See this file in:
/*
 * Copyright (c) 2021 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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#include <mach/vm_param.h>
#include <kasan-tbi.h>

#ifndef _KASAN_TBI_ARM64_H_
#define _KASAN_TBI_ARM64_H_

#define STOLEN_MEM_PERCENT      7UL
/* No need for quarantine with KASAN-TBI */
#define STOLEN_MEM_BYTES            MiB(20)

/* Defined in makedefs/MakeInc.def */
#ifndef KASAN_OFFSET_ARM64
#define KASAN_OFFSET_ARM64      0xf000000000000000ULL
#endif  /* KASAN_OFFSET_ARM64 */

#if defined(ARM_LARGE_MEMORY)
#define KASAN_SHADOW_MIN        (VM_MAX_KERNEL_ADDRESS+1)
#define KASAN_SHADOW_MAX        0xffffffffffffffffULL
#else
#define KASAN_SHADOW_MIN        0xfffffffe00000000ULL
#define KASAN_SHADOW_MAX        0xffffffffc0000000ULL
#endif

#endif /* _KASAN_TBI_ARM64_H_ */