xv6

commit 55ca7a8d1176fc6a03d9471870c949dd546ca424
parent 1b517da1056b90a3d8fcaf485719a82a5e7741a0
Author: Brian Swetland <swetland@frotz.net>
Date:   Mon, 30 Dec 2013 18:15:38 -0800

wrmsr()

parking this in assembly until I can figure out the correct syntax for
inline assembly for it.  gcc keeps generating code that mangles everything.

Diffstat:
M
kernel/entry64.S
 | 
11
+++++++++++

1 file changed, 11 insertions(+), 0 deletions(-)
diff --git a/kernel/entry64.S b/kernel/entry64.S
@@ -149,6 +149,17 @@ entry64high:
 # enter main()
   jmp main
 
+.global __deadloop
+__deadloop:
 # we should never return here...
   jmp .
 
+.global wrmsr
+wrmsr:
+  mov %rdi, %rcx     # arg0 -> msrnum
+  mov %rsi, %rax     # val.low -> eax
+  shr $32, %rsi
+  mov %rsi, %rdx     # val.high -> edx
+  wrmsr
+  retq
+