1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
*
* Copyright (c) 2012 Christoffer Dall <c.dall@virtualopensystems.com>
* <cdall@cs.columbia.edu>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
.syntax unified
.arch_extension sec
.arch_extension virt
.text
.align 5
/* We use the same vector table for Hyp and Monitor mode, since
* we will only use each once and they don't overlap.
*/
mon_vectors:
.word 0 /* reset */
.word 0 /* undef */
b 2f /* smc */
.word 0 /* pabt */
.word 0 /* dabt */
b 1f
.word 0 /* irq */
.word 0 /* fiq */
/* Return directly back to the caller without leaving Hyp mode: */
1: mrs lr, elr_hyp
mov pc, lr
/* In monitor mode, set up HVBAR and SCR then return to caller in NS-SVC. */
2:
mrc p15, 0, r1, c1, c1, 0 @ SCR
/*
* Set SCR.NS=1 (needed for setting HVBAR and also returning to NS state)
* .IRQ,FIQ,EA=0 (don't take aborts/exceptions to Monitor mode)
* .FW,AW=1 (CPSR.A,F modifiable in NS state)
* .nET=0 (early termination OK)
* .SCD=0 (SMC in NS mode OK, so we can call secure firmware)
* .HCE=1 (HVC does Hyp call)
*/
bic r1, r1, #0x07f
ldr r2, =0x131
orr r1, r1, r2
mcr p15, 0, r2, c1, c1, 0 @ SCR
isb
ldr r2, =mon_vectors
mcr p15, 4, r2, c12, c0, 0 @ set HVBAR
/* ...and return to calling code in NS state */
movs pc, lr
/******************************************************************************
* This code is called from u-boot into the above handler
*/
.globl monitor_init
monitor_init:
ldr ip, =mon_vectors
mcr p15, 0, ip, c12, c0, 1 @ Monitor vector base address
mov pc, lr
/* Try to go into NS-SVC: void enter_ns(void); */
.globl enter_ns
enter_ns:
smc #0
mov pc, lr
/* void enter_hyp(void); */
.globl enter_hyp
enter_hyp:
/* Now we're in NS-SVC, make a Hyp call to get into Hyp mode */
mov r0, lr
mov r1, sp
hvc #0
/* We will end up here in NS-Hyp. */
mov sp, r1
mov pc, r0
|
