[opensbi] create opensbi from T-Head official:

repo: https://github.com/T-head-Semi/opensbi
	commit: 89182b257c8798e15e4c685c1af0c2862d528d2a

Change-Id: I7b39d66729e0108661a6f4c9e28acbdb303684ea

opensbi/include/sbi/sbi_ipi.h

@@ -0,0 +1,88 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2019 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#ifndef __SBI_IPI_H__
+#define __SBI_IPI_H__
+
+#include <sbi/sbi_types.h>
+
+/* clang-format off */
+
+#define SBI_IPI_EVENT_MAX			__riscv_xlen
+
+/* clang-format on */
+
+/** IPI hardware device */
+struct sbi_ipi_device {
+	/** Name of the IPI device */
+	char name[32];
+
+	/** Send IPI to a target HART */
+	void (*ipi_send)(u32 target_hart);
+
+	/** Clear IPI for a target HART */
+	void (*ipi_clear)(u32 target_hart);
+};
+
+struct sbi_scratch;
+
+/** IPI event operations or callbacks */
+struct sbi_ipi_event_ops {
+	/** Name of the IPI event operations */
+	char name[32];
+
+	/**
+	 * Update callback to save/enqueue data for remote HART
+	 * Note: This is an optional callback and it is called just before
+	 * triggering IPI to remote HART.
+	 */
+	int (* update)(struct sbi_scratch *scratch,
+			struct sbi_scratch *remote_scratch,
+			u32 remote_hartid, void *data);
+
+	/**
+	 * Sync callback to wait for remote HART
+	 * Note: This is an optional callback and it is called just after
+	 * triggering IPI to remote HART.
+	 */
+	void (* sync)(struct sbi_scratch *scratch);
+
+	/**
+	 * Process callback to handle IPI event
+	 * Note: This is a mandatory callback and it is called on the
+	 * remote HART after IPI is triggered.
+	 */
+	void (* process)(struct sbi_scratch *scratch);
+};
+
+int sbi_ipi_send_many(ulong hmask, ulong hbase, u32 event, void *data);
+
+int sbi_ipi_event_create(const struct sbi_ipi_event_ops *ops);
+
+void sbi_ipi_event_destroy(u32 event);
+
+int sbi_ipi_send_smode(ulong hmask, ulong hbase);
+
+void sbi_ipi_clear_smode(void);
+
+int sbi_ipi_send_halt(ulong hmask, ulong hbase);
+
+void sbi_ipi_process(void);
+
+void sbi_ipi_raw_send(u32 target_hart);
+
+const struct sbi_ipi_device *sbi_ipi_get_device(void);
+
+void sbi_ipi_set_device(const struct sbi_ipi_device *dev);
+
+int sbi_ipi_init(struct sbi_scratch *scratch, bool cold_boot);
+
+void sbi_ipi_exit(struct sbi_scratch *scratch);
+
+#endif