From f1a727b971a59bab6025b4c4111342c27356ca40 Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Wed, 5 Jun 2019 11:42:03 -0400
Subject: start at support for multiple CPUs

---
 trampoline.S | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'trampoline.S')

diff --git a/trampoline.S b/trampoline.S
index 5886942..dd4eb02 100644
--- a/trampoline.S
+++ b/trampoline.S
@@ -120,6 +120,9 @@ trampin:
         # restore kernel stack pointer from p->tf->kernel_sp
         ld sp, 8(a0)
 
+        # make tp hold the current hartid, from p->tf->hartid
+        ld tp, 32(a0)
+
         # remember the address of usertrap(), p->tf->kernel_trap
         ld t0, 16(a0)
 
-- 
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