This is xnu-11215.1.10. See this file in:
/*!
 * @header
 * x86 chip environments.
 */
#ifndef __IMG4_CHIP_X86_H
#define __IMG4_CHIP_X86_H

#ifndef __IMG4_INDIRECT
#error "Please #include <img4/firmware.h> instead of this file directly"
#endif // __IMG4_INDIRECT

__BEGIN_DECLS
OS_ASSUME_NONNULL_BEGIN
OS_ASSUME_PTR_ABI_SINGLE_BEGIN

/*!
 * @const IMG4_CHIP_X86
 * An Intel x86 processor which cannot be uniquely identified.
 */
#if !XNU_KERNEL_PRIVATE
IMG4_API_AVAILABLE_20200508
OS_EXPORT
const img4_chip_t _img4_chip_x86;
#define IMG4_CHIP_X86 (&_img4_chip_x86)
#else
#define IMG4_CHIP_X86 (img4if->i4if_v7.chip_x86)
#endif

/*!
 * @const IMG4_CHIP_X86_SOFTWARE_8012
 * A software-defined chip environment describing a virtualized x86 processor.
 * Since the virtual machine is at the mercy of the VM, support for any sort of
 * chip identity may not be available. Therefore this environment is returned
 * from {@link img4_chip_select_personalized_ap} and
 * {@link img4_chip_select_effective_ap} when it is called on a virtual machine
 * so that the appropriate chip environment is present entirely in software.
 *
 * This environment provides an equivalent software identity to that of
 * the {@link IMG4_CHIP_X86} chip environment on non-Gibraltar Macs.
 *
 * @discussion
 * Do not use this environment directly.
 */
#if !XNU_KERNEL_PRIVATE
IMG4_API_AVAILABLE_20200508
OS_EXPORT
const img4_chip_t _img4_chip_x86_software_8012;
#define IMG4_CHIP_X86_SOFTWARE_8012 (&_img4_chip_x86_software_8012)
#else
#define IMG4_CHIP_X86_SOFTWARE_8012 (img4if->i4if_v7.chip_x86_software_8012)
#endif

OS_ASSUME_PTR_ABI_SINGLE_END
OS_ASSUME_NONNULL_END
__END_DECLS

#endif // __IMG4_CHIP_X86_H