1 files changed, 67 insertions, 0 deletions
diff --git a/src/core/mp.c b/src/core/mp.c
new file mode 100644
index 00000000..146d70a6
--- /dev/null
+++ b/src/core/mp.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+/** @file
+ *
+ * Multiprocessor functions
+ *
+ */
+
+#include <ipxe/timer.h>
+#include <ipxe/mp.h>
+
+/** Time to wait for application processors */
+#define MP_MAX_CPUID_WAIT_MS 10
+
+/**
+ * Get boot CPU identifier
+ *
+ * @ret id		Boot CPU identifier
+ */
+unsigned int mp_boot_cpuid ( void ) {
+	unsigned int max = 0;
+
+	/* Update maximum to accommodate boot processor */
+	mp_exec_boot ( mp_update_max_cpuid, &max );
+	DBGC ( &mp_call, "MP boot processor ID is %#x\n", max );
+
+	return max;
+}
+
+/**
+ * Get maximum CPU identifier
+ *
+ * @ret max		Maximum CPU identifier
+ */
+unsigned int mp_max_cpuid ( void ) {
+	unsigned int max = mp_boot_cpuid();
+
+	/* Update maximum to accommodate application processors */
+	mp_start_all ( mp_update_max_cpuid, &max );
+	mdelay ( MP_MAX_CPUID_WAIT_MS );
+	DBGC ( &mp_call, "MP observed maximum CPU ID is %#x\n", max );
+
+	return max;
+}