linuxkpi: Define VFM_*() macros in <asm/cpu_device_id.h>

They use another set of constants and macros in <asm/intel-family.h>.

All these macros are defined regardless of the architecture, even though
they are specific to x86. Perhaps we should restrict them using #ifdefs.

The amdgpu DRM driver started to used `VFM_MODEL()` and the
`INTEL_*LAKE*` constants in Linux 6.12.x.

Reviewed by:	bz, olce
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D56585

sys/compat/linuxkpi/common/include/asm/cpu_device_id.h

@@ -0,0 +1,33 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2026 The FreeBSD Foundation
+ */
+
+#ifndef _LINUXKPI_ASM_CPU_DEVICE_ID_H_
+#define	_LINUXKPI_ASM_CPU_DEVICE_ID_H_
+
+#define	VFM_MODEL_BIT	0
+#define	VFM_FAMILY_BIT	8
+#define	VFM_VENDOR_BIT	16
+#define	VFM_RSVD_BIT	24
+
+#define	VFM_MODEL_MASK	GENMASK(VFM_FAMILY_BIT - 1, VFM_MODEL_BIT)
+#define	VFM_FAMILY_MASK	GENMASK(VFM_VENDOR_BIT - 1, VFM_FAMILY_BIT)
+#define	VFM_VENDOR_MASK	GENMASK(VFM_RSVD_BIT - 1, VFM_VENDOR_BIT)
+
+#define	VFM_MODEL(vfm)	(((vfm) & VFM_MODEL_MASK) >> VFM_MODEL_BIT)
+#define	VFM_FAMILY(vfm)	(((vfm) & VFM_FAMILY_MASK) >> VFM_FAMILY_BIT)
+#define	VFM_VENDOR(vfm)	(((vfm) & VFM_VENDOR_MASK) >> VFM_VENDOR_BIT)
+
+#define	VFM_MAKE(_vendor, _family, _model) (	\
+	((_model) << VFM_MODEL_BIT) |		\
+	((_family) << VFM_FAMILY_BIT) |		\
+	((_vendor) << VFM_VENDOR_BIT)		\
+)
+
+#include <linux/mod_devicetable.h>
+#include <asm/intel-family.h>
+#include <asm/processor.h>
+
+#endif /* _LINUXKPI_ASM_CPU_DEVICE_ID_H_ */

sys/compat/linuxkpi/common/include/asm/intel-family.h

@@ -1,5 +1,14 @@
 /* Public domain. */
 
+#define	IFM(_fam, _model)	VFM_MAKE(X86_VENDOR_INTEL, _fam, _model)
+
+#define	INTEL_ALDERLAKE			IFM(6, 0x97)
+#define	INTEL_ALDERLAKE_L		IFM(6, 0x9A)
+
+#define	INTEL_RAPTORLAKE		IFM(6, 0xB7)
+#define	INTEL_RAPTORLAKE_P		IFM(6, 0xBA)
+#define	INTEL_RAPTORLAKE_S		IFM(6, 0xBF)
+
 #define	INTEL_FAM6_ALDERLAKE	0x97
 #define	INTEL_FAM6_ALDERLAKE_L	0x9A