[opensbi] create opensbi from T-Head official:

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

Change-Id: I7b39d66729e0108661a6f4c9e28acbdb303684ea

opensbi/lib/utils/sys/sifive_test.c

@@ -0,0 +1,65 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#include <sbi/riscv_io.h>
+#include <sbi/sbi_ecall_interface.h>
+#include <sbi/sbi_system.h>
+#include <sbi_utils/sys/sifive_test.h>
+
+#define FINISHER_FAIL		0x3333
+#define FINISHER_PASS		0x5555
+#define FINISHER_RESET		0x7777
+
+static void *sifive_test_base;
+
+static int sifive_test_system_reset_check(u32 type, u32 reason)
+{
+	switch (type) {
+	case SBI_SRST_RESET_TYPE_SHUTDOWN:
+	case SBI_SRST_RESET_TYPE_COLD_REBOOT:
+	case SBI_SRST_RESET_TYPE_WARM_REBOOT:
+		return 1;
+	}
+
+	return 0;
+}
+
+static void sifive_test_system_reset(u32 type, u32 reason)
+{
+	/*
+	 * Tell the "finisher" that the simulation
+	 * was successful so that QEMU exits
+	 */
+	switch (type) {
+	case SBI_SRST_RESET_TYPE_SHUTDOWN:
+		if (reason == SBI_SRST_RESET_REASON_NONE)
+			writew(FINISHER_PASS, sifive_test_base);
+		else
+			writew(FINISHER_FAIL, sifive_test_base);
+		break;
+	case SBI_SRST_RESET_TYPE_COLD_REBOOT:
+	case SBI_SRST_RESET_TYPE_WARM_REBOOT:
+		writew(FINISHER_RESET, sifive_test_base);
+		break;
+	}
+}
+
+static struct sbi_system_reset_device sifive_test_reset = {
+	.name = "sifive_test",
+	.system_reset_check = sifive_test_system_reset_check,
+	.system_reset = sifive_test_system_reset
+};
+
+int sifive_test_init(unsigned long base)
+{
+	sifive_test_base = (void *)base;
+	sbi_system_reset_set_device(&sifive_test_reset);
+
+	return 0;
+}