Add Hart State Management functions. These will be needed to spin up

the secondary cores.  From FreeBSD.

ok mlarkin@

1 files changed, 35 insertions, 1 deletions

diff --git a/sys/arch/riscv64/include/sbi.h b/sys/arch/riscv64/include/sbi.h
index 45b4dcc4d21..70fd30f9a74 100644
--- a/sys/arch/riscv64/include/sbi.h
+++ b/sys/arch/riscv64/include/sbi.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sbi.h,v 1.2 2021/05/12 01:20:52 jsg Exp $	*/
+/*	$OpenBSD: sbi.h,v 1.3 2021/06/27 15:02:25 kettenis Exp $	*/
 
 /*-
  * Copyright (c) 2016-2017 Ruslan Bukin <br@bsdpad.com>
@@ -68,6 +68,16 @@
 #define	SBI_BASE_GET_MARCHID		5
 #define	SBI_BASE_GET_MIMPID		6
 
+/* Hart State Management (HSM) Extension */
+#define	SBI_EXT_ID_HSM			0x48534D
+#define	SBI_HSM_HART_START		0
+#define	SBI_HSM_HART_STOP		1
+#define	SBI_HSM_HART_STATUS		2
+#define	 SBI_HSM_STATUS_STARTED		0
+#define	 SBI_HSM_STATUS_STOPPED		1
+#define	 SBI_HSM_STATUS_START_PENDING	2
+#define	 SBI_HSM_STATUS_STOP_PENDING	3
+
 /* Legacy Extensions */
 #define	SBI_SET_TIMER			0
 #define	SBI_CONSOLE_PUTCHAR		1
@@ -130,6 +140,30 @@ sbi_probe_extension(long id)
 	return (SBI_CALL1(SBI_EXT_ID_BASE, SBI_BASE_PROBE_EXTENSION, id).value);
 }
 
+/* Hart State Management extension functions. */
+
+/*
+ * Start execution on the specified hart at physical address start_addr. The
+ * register a0 will contain the hart's ID, and a1 will contain the value of
+ * priv.
+ */
+int sbi_hsm_hart_start(u_long hart, u_long start_addr, u_long priv);
+
+/*
+ * Stop execution on the current hart. Interrupts should be disabled, or this
+ * function may return.
+ */
+void sbi_hsm_hart_stop(void);
+
+/*
+ * Get the execution status of the specified hart. The status will be one of:
+ *  - SBI_HSM_STATUS_STARTED
+ *  - SBI_HSM_STATUS_STOPPED
+ *  - SBI_HSM_STATUS_START_PENDING
+ *  - SBI_HSM_STATUS_STOP_PENDING
+ */
+int sbi_hsm_hart_status(u_long hart);
+
 /* Legacy extension functions. */
 static __inline void
 sbi_console_putchar(int ch)