[RFC patch 1/4] riscv: Add 3 SBI wrapper functions to get cpu manufacturer information

[Vincent Chen <vincent.chen@sifive.com>]

Add 3 wrapper functions to get vendor id, architecture id and implement id
from M-mode

Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
---
 arch/riscv/include/asm/sbi.h |  3 +++
 arch/riscv/kernel/sbi.c      | 15 +++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 99895d9c3bdd..94a7f664caf4 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -97,6 +97,9 @@ struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
 
 void sbi_console_putchar(int ch);
 int sbi_console_getchar(void);
+long sbi_get_vendorid(void);
+long sbi_get_archid(void);
+long sbi_get_impid(void);
 void sbi_set_timer(uint64_t stime_value);
 void sbi_shutdown(void);
 void sbi_clear_ipi(void);
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
index f4a7db3d309e..33e3a9d6efab 100644
--- a/arch/riscv/kernel/sbi.c
+++ b/arch/riscv/kernel/sbi.c
@@ -547,6 +547,21 @@ static inline long sbi_get_firmware_version(void)
 	return __sbi_base_ecall(SBI_EXT_BASE_GET_IMP_VERSION);
 }
 
+long sbi_get_vendorid(void)
+{
+	return __sbi_base_ecall(SBI_EXT_BASE_GET_MVENDORID);
+}
+
+long sbi_get_archid(void)
+{
+	return __sbi_base_ecall(SBI_EXT_BASE_GET_MARCHID);
+}
+
+long sbi_get_impid(void)
+{
+	return __sbi_base_ecall(SBI_EXT_BASE_GET_MIMPID);
+}
+
 static void sbi_send_cpumask_ipi(const struct cpumask *target)
 {
 	struct cpumask hartid_mask;
-- 
2.7.4


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