sp1/amd64: cpu: Add CPU preinit helper

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

usr/src/head/stdbool.h

@@ -9,7 +9,7 @@
  * consent from Mirocom Laboratories.
  */
 
-#ifndef _STDBOOL_H_ 1
+#ifndef _STDBOOL_H_
 #define _STDBOOL_H_ 1
 
 #ifndef _HAVE_bool

usr/src/sp1/amd64/Makefile

@@ -10,7 +10,10 @@
 #
 
 ASMFILES = $(shell find . -name "*.S")
+CFILES = $(shell find . -name "*.c")
+
 ASMOFILES = $(ASMFILES:.S=.S.o)
+OFILES = $(CFILES:.c=.o)
 
 MISC_OFILES = $(shell find ../ -name "*.o")
 LIB_OFILES = $(shell find ../../lib/ -name "*.o")
@@ -22,15 +25,21 @@ LD =				\
 	../../../../$(SYS_LD)
 
 CFLAGS = 			\
-	$(SYS_CFLAGS)
+	$(SYS_CFLAGS)   \
+	-I../../head    \
+	-I../../sp1/head\
+	-D_KERNEL
 
 .PHONY: all
-all: $(ASMOFILES)
+all: $(OFILES) $(ASMOFILES)
 	$(LD) 			   \
 		-Tconf/link.ld \
 		$(MISC_OFILES) \
 		$(LIB_OFILES)  \
 		-o ../../../../sp1.sys
 
+%.o: %.c
+	$(CC) -c $(CFLAGS) $< -o $@
+
 %.S.o: %.S
 	$(CC) -c $(CFLAGS) $< -o $@

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

@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+
+#include <mu/cpu.h>
+#include <lib/printf.h>
+#include <stdbool.h>
+
+#define pr_trace(fmt, ...) \
+    printf("cpu: " fmt, ##__VA_ARGS__)
+
+/* From locore.S - low level processor init */
+extern void md_cpu_init(void);
+
+/*
+ * Print information about the bootstrap
+ * processor on early startup
+ */
+static void
+cpu_print_info(void)
+{
+    static bool once = false;
+
+    if (once) {
+        return;
+    }
+
+    pr_trace("pg.nx : yes\n");
+    once = true;
+}
+
+void
+mu_cpu_preinit(struct cpu_info *ci)
+{
+    if (ci == NULL) {
+        return;
+    }
+
+    /* Default to an ID of zero [BSP] */
+    ci->id = 0;
+
+    /* Initialize control registers and such */
+    md_cpu_init();
+
+    /* Log out some information */
+    cpu_print_info();
+}

usr/src/sp1/amd64/cpu/locore.S

@@ -22,3 +22,24 @@ _start:
     cli
 1:  hlt
     jmp 1b
+
+    .globl md_cpu_init
+    .set IA32_EFER, 0xC0000080
+md_cpu_init:
+    push %r12
+    push %r13
+    push %r14
+    push %r15
+    push %rbx
+
+    mov $IA32_EFER, %ecx    // IA32_EFER
+    rdmsr                   // -> EDX:EAX
+    or $1<<11, %eax         // Set NXE
+    wrmsr                   // Write it back
+
+    pop %rbx
+    pop %r15
+    pop %r14
+    pop %r13
+    pop %r12
+    retq

usr/src/sp1/common/os/main.c

@@ -11,11 +11,15 @@
 
 #include <io/cons/cons.h>
 #include <lib/printf.h>
+#include <mu/cpu.h>
 
 #define KERNEL_VERSION "0.0.1"
 
+/* Bootstrap processor */
+static struct cpu_info bsp;
+
 /* Root console attribute */
-struct cons_attr cons_attr = {
+static struct cons_attr cons_attr = {
     .fg = 0x808080,
     .bg = 0x000000
 };
@@ -35,4 +39,7 @@ main(void)
 
     /* Write the boot console */
     boot_banner();
+
+    /* Pre-init the processor */
+    mu_cpu_preinit(&bsp);
 }

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

@@ -0,0 +1,33 @@
+/*
+ * 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 _MU_CPU_H_
+#define _MU_CPU_H_ 1
+
+#include <sys/types.h>
+
+/*
+ * MI processor specific information
+ *
+ * @id:   Processor ID
+ */
+struct cpu_info {
+    uint8_t id;
+};
+
+/*
+ * Routine used early on to initialize critical processor
+ * features and gather information about the processor so
+ * that your machine is OwOing smoothly.
+ */
+void mu_cpu_preinit(struct cpu_info *ci);
+
+#endif  /* !_MU_CPU_H_ */