From 5753553213df8f9de851adb68377db43faecb91f Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Tue, 11 Jun 2019 09:57:14 -0400
Subject: separate source into kernel/ user/ mkfs/

---
 kernel/swtch.S | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 kernel/swtch.S

(limited to 'kernel/swtch.S')

diff --git a/kernel/swtch.S b/kernel/swtch.S
new file mode 100644
index 0000000..17a8663
--- /dev/null
+++ b/kernel/swtch.S
@@ -0,0 +1,42 @@
+# Context switch
+#
+#   void swtch(struct context *old, struct context *new);
+# 
+# Save current registers in old. Load from new.	
+
+
+.globl swtch
+swtch:
+        sd ra, 0(a0)
+        sd sp, 8(a0)
+        sd s0, 16(a0)
+        sd s1, 24(a0)
+        sd s2, 32(a0)
+        sd s3, 40(a0)
+        sd s4, 48(a0)
+        sd s5, 56(a0)
+        sd s6, 64(a0)
+        sd s7, 72(a0)
+        sd s8, 80(a0)
+        sd s9, 88(a0)
+        sd s10, 96(a0)
+        sd s11, 104(a0)
+
+        ld ra, 0(a1)
+        ld sp, 8(a1)
+        ld s0, 16(a1)
+        ld s1, 24(a1)
+        ld s2, 32(a1)
+        ld s3, 40(a1)
+        ld s4, 48(a1)
+        ld s5, 56(a1)
+        ld s6, 64(a1)
+        ld s7, 72(a1)
+        ld s8, 80(a1)
+        ld s9, 88(a1)
+        ld s10, 96(a1)
+        ld s11, 104(a1)
+        
+        ret
+
+	
-- 
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