From f892b43a2bb1c2405b9941aaefdb25e3b4efe1f1 Mon Sep 17 00:00:00 2001
From: sashimi-yzh <yuzihao@ict.ac.cn>
Date: Fri, 16 Sep 2016 02:02:20 +0800
Subject: machine, mentry.S: fix not receiving IPI for other harts (#38)

* Before waiting for IPI by executing wfi instruction, MSIE bit
  should be set in mie CSR for other harts, else they will get
  stuck at the wfi instruction.
---
 machine/mentry.S | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'machine/mentry.S')

diff --git a/machine/mentry.S b/machine/mentry.S
index 9d2fe75..64c60c3 100644
--- a/machine/mentry.S
+++ b/machine/mentry.S
@@ -232,6 +232,10 @@ do_reset:
 
   beqz a0, init_first_hart
 
+  # set MSIE bit to receive IPI
+  li a1, MIP_MSIP
+  csrw mie, a1
+
 .LmultiHart:
 #if MAX_HARTS > 1
   # wait for an IPI to signal that it's safe to boot
-- 
cgit v1.1