From e16f5f81dfb2e97a554ec19b941ec05a7942fd2d Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Fri, 4 Aug 2023 20:50:41 +0300
Subject: add initial smp bringup

---
 arch/riscv64/kernel/sbi.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'arch/riscv64/kernel/sbi.h')

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 */
-- 
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