kern/amd64+mu: Introduce percpu machine core block

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

2 files changed, 51 insertions, 0 deletions

diff --git a/sys/inc/arch/amd64/mcb.h b/sys/inc/arch/amd64/mcb.h
new file mode 100644
index 0000000..8d0777a
--- /dev/null
+++ b/sys/inc/arch/amd64/mcb.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * PKERNSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_MCB_H_
+#define _MACHINE_MCB_H_ 1
+
+#include <sys/types.h>
+
+/*
+ * The machine core block (MCB) contains machine
+ * specific information and should only be touched
+ * within machine specific contexts
+ *
+ * @hwid: Hardware APIC ID
+ * @xapic_io: MMIO base for the legacy xAPIC
+ */
+struct mcb {
+    uint32_t hwid;
+    void *xapic_io;
+};
+
+#endif  /* !_MACHINE_MCB_H_ */
diff --git a/sys/inc/mu/cpu.h b/sys/inc/mu/cpu.h
index c96184b..d49c22e 100644
--- a/sys/inc/mu/cpu.h
+++ b/sys/inc/mu/cpu.h
@@ -31,14 +31,17 @@
 #define _MU_CPU_H_ 1
 
 #include <sys/types.h>
+#include <md/mcb.h>
 
 /*
  * Processor descriptor
  *
  * @id: Logical ID of the processor
+ * @mcb: Machine core block
  */
 struct cpu_info {
     uint8_t id;
+    struct mcb *mcb;
 };
 
 /*