1 files changed, 49 insertions, 0 deletions
diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c
new file mode 100644
index 00000000000..ae57fb83132
--- /dev/null
+++ b/arch/riscv/cpu/cpu.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#include <common.h>
+#include <asm/csr.h>
+
+enum {
+	ISA_INVALID = 0,
+	ISA_32BIT,
+	ISA_64BIT,
+	ISA_128BIT
+};
+
+static const char * const isa_bits[] = {
+	[ISA_INVALID] = NULL,
+	[ISA_32BIT]   = "32",
+	[ISA_64BIT]   = "64",
+	[ISA_128BIT]  = "128"
+};
+
+static inline bool supports_extension(char ext)
+{
+	return csr_read(misa) & (1 << (ext - 'a'));
+}
+
+int print_cpuinfo(void)
+{
+	char name[32];
+	char *s = name;
+	int bit;
+
+	s += sprintf(name, "rv");
+	bit = csr_read(misa) >> (sizeof(long) * 8 - 2);
+	s += sprintf(s, isa_bits[bit]);
+
+	supports_extension('i') ? *s++ = 'i' : 'r';
+	supports_extension('m') ? *s++ = 'm' : 'i';
+	supports_extension('a') ? *s++ = 'a' : 's';
+	supports_extension('f') ? *s++ = 'f' : 'c';
+	supports_extension('d') ? *s++ = 'd' : '-';
+	supports_extension('c') ? *s++ = 'c' : 'v';
+	*s++ = '\0';
+
+	printf("CPU:   %s\n", name);
+
+	return 0;
+}