1 files changed, 79 insertions, 0 deletions
diff --git a/roms/opensbi/lib/sbi/sbi_ecall_base.c b/roms/opensbi/lib/sbi/sbi_ecall_base.c
new file mode 100644
index 000000000..786d2ac67
--- /dev/null
+++ b/roms/opensbi/lib/sbi/sbi_ecall_base.c
@@ -0,0 +1,79 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ *   Atish Patra <atish.patra@wdc.com>
+ */
+
+#include <sbi/sbi_ecall.h>
+#include <sbi/sbi_ecall_interface.h>
+#include <sbi/sbi_error.h>
+#include <sbi/sbi_trap.h>
+#include <sbi/sbi_version.h>
+#include <sbi/riscv_asm.h>
+
+static int sbi_ecall_base_probe(unsigned long extid, unsigned long *out_val)
+{
+	struct sbi_ecall_extension *ext;
+
+	ext = sbi_ecall_find_extension(extid);
+	if (!ext) {
+		*out_val = 0;
+		return 0;
+	}
+
+	if (ext->probe)
+		return ext->probe(extid, out_val);
+
+	*out_val = 1;
+	return 0;
+}
+
+static int sbi_ecall_base_handler(unsigned long extid, unsigned long funcid,
+				  const struct sbi_trap_regs *regs,
+				  unsigned long *out_val,
+				  struct sbi_trap_info *out_trap)
+{
+	int ret = 0;
+
+	switch (funcid) {
+	case SBI_EXT_BASE_GET_SPEC_VERSION:
+		*out_val = (SBI_ECALL_VERSION_MAJOR <<
+			   SBI_SPEC_VERSION_MAJOR_OFFSET) &
+			   (SBI_SPEC_VERSION_MAJOR_MASK <<
+			    SBI_SPEC_VERSION_MAJOR_OFFSET);
+		*out_val = *out_val | SBI_ECALL_VERSION_MINOR;
+		break;
+	case SBI_EXT_BASE_GET_IMP_ID:
+		*out_val = sbi_ecall_get_impid();
+		break;
+	case SBI_EXT_BASE_GET_IMP_VERSION:
+		*out_val = OPENSBI_VERSION;
+		break;
+	case SBI_EXT_BASE_GET_MVENDORID:
+		*out_val = csr_read(CSR_MVENDORID);
+		break;
+	case SBI_EXT_BASE_GET_MARCHID:
+		*out_val = csr_read(CSR_MARCHID);
+		break;
+	case SBI_EXT_BASE_GET_MIMPID:
+		*out_val = csr_read(CSR_MIMPID);
+		break;
+	case SBI_EXT_BASE_PROBE_EXT:
+		ret = sbi_ecall_base_probe(regs->a0, out_val);
+		break;
+	default:
+		ret = SBI_ENOTSUPP;
+	}
+
+	return ret;
+}
+
+struct sbi_ecall_extension ecall_base = {
+	.extid_start = SBI_EXT_BASE,
+	.extid_end = SBI_EXT_BASE,
+	.handle = sbi_ecall_base_handler,
+};