add initial smp bringup

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/riscv64/kernel/sbi.h b/arch/riscv64/kernel/sbi.h
index 8abff25..fe75c85 100644
--- a/arch/riscv64/kernel/sbi.h
+++ b/arch/riscv64/kernel/sbi.h
@@ -133,6 +133,14 @@ static inline struct sbiret sbi_send_ipi(unsigned long hart_mask,
 /** Hart start function ID. */
 #define FID_HSM_START 0
 
+/**
+ * Start hart.
+ *
+ * @param hartid Hart to start.
+ * @param start_addr Address to jump to in S mode.
+ * @param opaque OS-specific argument passed to hart.
+ * @return SBI call return. \see sbiret.
+ */
 static inline struct sbiret sbi_hart_start(unsigned long hartid,
                                            unsigned long start_addr,
                                            unsigned long opaque)
@@ -141,4 +149,25 @@ static inline struct sbiret sbi_hart_start(unsigned long hartid,
 	                 0, 0, 0);
 }
 
+/** Hart status function ID. */
+#define FID_HSM_STATUS 2
+
+/**
+ * Get hart status.
+ *
+ * @param hartid Hart ID.
+ * @return SBI call return. \see sbiret.
+ */
+static inline struct sbiret sbi_hart_status(unsigned long hartid)
+{
+	return sbi_ecall(EID_HSM, FID_HSM_STATUS, hartid,
+	                 0, 0, 0, 0, 0);
+}
+
+/**
+ * Status code \ref sbi_hart_status() returns for a started hart.
+ * The only one we're currently interested in.
+ */
+#define SBI_HART_STARTED 0
+
 #endif /* KMI_RISCV_SBI_H */