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Diffstat (limited to 'monitor.S')
| -rw-r--r-- | monitor.S | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/monitor.S b/monitor.S new file mode 100644 index 0000000..4747e70 --- /dev/null +++ b/monitor.S @@ -0,0 +1,31 @@ +/* + * monitor.S - simple monitor code to switch to NS state before executing kernel + * + * Copyright (C) 2011 Columbia University. All rights reserved. + * Christoffer Dall <cdall@cs.columbia.edu> + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE.txt file. + */ + +#.syntax unified + .section monitor, "x" + + .word 0 + .word 0 + b 1f + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + + @ + @ Secure Monitor Call + @ +1: + mrc p15, 0, r0, c1, c1, 0 @ Secure configuration register + bic r0, r0, #0x7f + orr r0, r0, #0x31 + mcr p15, 0, r0, c1, c1, 0 + movs pc, lr |