x86: Add zen identifier helper function

Reviewed by:    kib
MFC after:      2 weeks
Sponsored by:   The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D56330

sys/x86/include/cputypes.h

@@ -45,4 +45,16 @@
 #define	CPU_VENDOR_CENTAUR	CPU_VENDOR_IDT
 #define	CPU_VENDOR_HYGON	0x1d94		/* Hygon */
 
+#define CPU_AMD_ZEN1		0x00
+#define CPU_AMD_ZEN2		0x01
+#define CPU_AMD_ZEN3		0x02
+#define CPU_AMD_ZEN4		0x03
+#define CPU_AMD_ZEN5		0x04
+#define CPU_AMD_ZEN6		0x05
+#define CPU_AMD_UNKNOWN		0xffffffff
+
+#ifdef _KERNEL
+u_int	ident_zen_cpu(void);
+#endif
+
 #endif /* !_X86_CPUTYPES_H_ */

sys/x86/x86/identcpu.c

@@ -64,6 +64,7 @@
 #include <machine/specialreg.h>
 
 #include <amd64/vmm/intel/vmx_controls.h>
+#include <x86/cputypes.h>
 #include <x86/isa/icu.h>
 #include <x86/vmware.h>
 
@@ -2690,3 +2691,49 @@ cpu_getmaxphyaddr(void)
 #endif
 	return ((1ULL << cpu_maxphyaddr) - 1);
 }
+
+const static struct {
+	u_int family;
+	u_int model_min;
+	u_int model_max;
+	u_int generation;
+} zen_idents[] = {
+	{ .family = 0x17, .model_min = 0x00, .model_max = 0x2f, .generation = CPU_AMD_ZEN1 },
+	{ .family = 0x17, .model_min = 0x50, .model_max = 0x5f, .generation = CPU_AMD_ZEN1 },
+	{ .family = 0x17, .model_min = 0x30, .model_max = 0x4f, .generation = CPU_AMD_ZEN2 },
+	{ .family = 0x17, .model_min = 0x60, .model_max = 0x7f, .generation = CPU_AMD_ZEN2 },
+	{ .family = 0x17, .model_min = 0x90, .model_max = 0x91, .generation = CPU_AMD_ZEN2 },
+	{ .family = 0x17, .model_min = 0xa0, .model_max = 0xaf, .generation = CPU_AMD_ZEN2 },
+	{ .family = 0x19, .model_min = 0x00, .model_max = 0x0f, .generation = CPU_AMD_ZEN3 },
+	{ .family = 0x19, .model_min = 0x20, .model_max = 0x5f, .generation = CPU_AMD_ZEN3 },
+	{ .family = 0x19, .model_min = 0x10, .model_max = 0x1f, .generation = CPU_AMD_ZEN4 },
+	{ .family = 0x19, .model_min = 0x60, .model_max = 0xaf, .generation = CPU_AMD_ZEN4 },
+	{ .family = 0x1a, .model_min = 0x00, .model_max = 0x2f, .generation = CPU_AMD_ZEN5 },
+	{ .family = 0x1a, .model_min = 0x40, .model_max = 0x4f, .generation = CPU_AMD_ZEN5 },
+	{ .family = 0x1a, .model_min = 0x60, .model_max = 0x7f, .generation = CPU_AMD_ZEN5 },
+	{ .family = 0x1a, .model_min = 0x50, .model_max = 0x5f, .generation = CPU_AMD_ZEN6 },
+	{ .family = 0x1a, .model_min = 0x80, .model_max = 0xaf, .generation = CPU_AMD_ZEN6 },
+	{ .family = 0x1a, .model_min = 0xc0, .model_max = 0xcf, .generation = CPU_AMD_ZEN6 },
+};
+
+u_int
+ident_zen_cpu(void)
+{
+	u_int family = CPUID_TO_FAMILY(cpu_id);
+	u_int model = CPUID_TO_MODEL(cpu_id);
+	int i;
+
+	if (cpu_vendor_id != CPU_VENDOR_AMD)
+		return (CPU_AMD_UNKNOWN);
+
+	for (i = 0; i < nitems(zen_idents); i++) {
+		if (family != zen_idents[i].family)
+			continue;
+		if (model < zen_idents[i].model_min ||
+		    model > zen_idents[i].model_max)
+			continue;
+		return (zen_idents[i].generation);
+	}
+
+	return (CPU_AMD_UNKNOWN);
+}