spi/amd64: cpu: Get processor model + family ID

Signed-off-by: Ian Moffett <ian@mirocom.org>

usr/src/sp1/amd64/cpu/cpu_init.c

@@ -11,6 +11,7 @@
 
 #include <mu/cpu.h>
 #include <lib/printf.h>
+#include <machine/cpuid.h>
 #include <stdbool.h>
 
 #define pr_trace(fmt, ...) \
@@ -24,18 +25,50 @@ extern void md_cpu_init(void);
  * processor on early startup
  */
 static void
-cpu_print_info(void)
+cpu_print_info(struct cpu_info *ci)
 {
     static bool once = false;
+    struct mcb *mcb;
 
-    if (once) {
+    if (once || ci == NULL) {
         return;
     }
 
+    mcb = &ci->mcb;
     pr_trace("pg.nx       : yes\n");
+    pr_trace("cpu.model   : %x\n", mcb->model_id);
+    pr_trace("cpu.family  : %x\n", mcb->family_id);
     once = true;
 }
 
+static void
+cpu_get_info(struct cpu_info *ci)
+{
+    struct mcb *mcb;
+    uint32_t eax, unused;
+    uint8_t model_low, model_high;
+    uint8_t family_low, family_high;
+
+    if (ci == NULL) {
+        return;
+    }
+
+    mcb = &ci->mcb;
+
+    /* Get processor info and feature bits */
+    __cpuid(0x01, eax, unused, unused, unused);
+
+    /* Obtain the model ID */
+    model_low  = (eax >> 4) & 0xF;
+    model_high = (eax >> 16) & 0xF;
+    mcb->model_id = (model_high << 4) | model_low;
+
+    /* Obtain the family ID */
+    family_low  = (eax >> 8)  & 0xF;
+    family_high = (eax >> 20) & 0xFF;
+    mcb->family_id = (family_high << 4) | family_low;
+}
+
 void
 mu_cpu_preinit(struct cpu_info *ci)
 {
@@ -49,6 +82,9 @@ mu_cpu_preinit(struct cpu_info *ci)
     /* Initialize control registers and such */
     md_cpu_init();
 
+    /* Obtain some processor information */
+    cpu_get_info(ci);
+
     /* Log out some information */
-    cpu_print_info();
+    cpu_print_info(ci);
 }

usr/src/sp1/head/amd64/mcb.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2026, Mirocom Laboratories
+ * All rights reserved.
+ *
+ * The following sources are CONFIDENTIAL and PROPRIETARY
+ * property of Mirocom Laboratories. Unauthorized copying,
+ * use, distribution or modification of this file, in whole
+ * and in part, is strictly prohibited without the prior written
+ * consent from Mirocom Laboratories.
+ */
+
+#ifndef _MACHINE_MCB_H_
+#define _MACHINE_MCB_H_ 1
+
+#include <sys/types.h>
+
+/*
+ * The machine core block contains MD processor
+ * specific information
+ *
+ * @model_id:  Processor model ID
+ * @family_id: Processor family ID
+ */
+struct mcb {
+    uint8_t model_id;
+    uint16_t family_id : 12;
+};
+
+#endif  /* !_MACHINE_MCB_H_ */

usr/src/sp1/head/mu/cpu.h

@@ -13,14 +13,17 @@
 #define _MU_CPU_H_ 1
 
 #include <sys/types.h>
+#include <machine/mcb.h>    /* shared */
 
 /*
  * MI processor specific information
  *
  * @id:   Processor ID
+ * @mcb:  Machine core block
  */
 struct cpu_info {
     uint8_t id;
+    struct mcb mcb;
 };
 
 /*