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/*
* 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:
cmp r7, #0xffffffff
beq _non_sec
@ Check smc number and VMID
bic r12, r7, #0xf
cmp r12, #0xfffffff0
movnes pc, lr
and r12, r7, #0xf
cmp r12, #0x0
movgts pc, lr
@ Check the VMID is 0
mrrc p15, 6, r12, r13, c2
lsr r13, r13, #16
and r13, r13, #0xff
cmp r13, #0
movnes pc, lr
@ Jump to the right function
and r12, r7, #0xf
adr r13, _hyp_funcs
add r13, r13, r12, lsl #2
ldr pc, [r13]
@
@ Jump table for the SMC hypervisor API calls
@
_hyp_funcs:
.long _write_hvbar
@
@ Switch to non-secure mode
@
_non_sec:
mrc p15, 0, r0, c1, c1, 0 @ Secure configuration register
bic r0, r0, #0x07f
ldr r13, =0x131
orr r0, r0, r13
mcr p15, 0, r0, c1, c1, 0
movs pc, lr
@
@ Read/Write HVBAR
@
_write_hvbar:
mcr p15, 4, r0, c12, c0, 0
movs pc, lr
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