Resguardo inicial

linux-7.2.3/arch/riscv/kernel/cpu_ops.c

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/of.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <asm/cpu_ops.h>
+#include <asm/cpu_ops_sbi.h>
+#include <asm/sbi.h>
+#include <asm/smp.h>
+
+const struct cpu_operations *cpu_ops __ro_after_init = &cpu_ops_spinwait;
+
+extern const struct cpu_operations cpu_ops_sbi;
+#ifndef CONFIG_RISCV_BOOT_SPINWAIT
+const struct cpu_operations cpu_ops_spinwait = {
+	.cpu_start	= NULL,
+};
+#endif
+
+void __init cpu_set_ops(void)
+{
+#if IS_ENABLED(CONFIG_RISCV_SBI)
+	if (sbi_probe_extension(SBI_EXT_HSM)) {
+		pr_info("SBI HSM extension detected\n");
+		cpu_ops = &cpu_ops_sbi;
+	}
+#endif
+}