bl2_entrypoint.S 3.89 KB
Newer Older
1
/*
Dan Handley's avatar
Dan Handley committed
2
 * Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
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
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <bl_common.h>
32
#include <arch.h>
33
34
35
36
37


	.globl	bl2_entrypoint


38
	.section	.text, "ax"; .align 3
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62


bl2_entrypoint:; .type bl2_entrypoint, %function
	/*---------------------------------------------
	 * Store the extents of the tzram available to
	 * BL2 for future use. Use the opcode param to
	 * allow implement other functions if needed.
	 * ---------------------------------------------
	 */
	mov	x20, x0
	mov	x21, x1
	mov	x22, x2

	/* ---------------------------------------------
	 * This is BL2 which is expected to be executed
	 * only by the primary cpu (at least for now).
	 * So, make sure no secondary has lost its way.
	 * ---------------------------------------------
	 */
	bl	read_mpidr
	mov	x19, x0
	bl	platform_is_primary_cpu
	cbz	x0, _panic

63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
	/* ---------------------------------------------
	 * Set the exception vector to something sane.
	 * ---------------------------------------------
	 */
	adr	x0, early_exceptions
	msr	vbar_el1, x0

	/* ---------------------------------------------
	 * Enable the instruction cache.
	 * ---------------------------------------------
	 */
	mrs	x0, sctlr_el1
	orr	x0, x0, #SCTLR_I_BIT
	msr	sctlr_el1, x0

	isb

80
81
82
83
84
85
86
87
88
89
90
91
92
93
	/* ---------------------------------------------
	 * Zero out NOBITS sections. There are 2 of them:
	 *   - the .bss section;
	 *   - the coherent memory section.
	 * ---------------------------------------------
	 */
	ldr	x0, =__BSS_START__
	ldr	x1, =__BSS_SIZE__
	bl	zeromem16

	ldr	x0, =__COHERENT_RAM_START__
	ldr	x1, =__COHERENT_RAM_UNALIGNED_SIZE__
	bl	zeromem16

94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
	/* --------------------------------------------
	 * Give ourselves a small coherent stack to
	 * ease the pain of initializing the MMU
	 * --------------------------------------------
	 */
	mov	x0, x19
	bl	platform_set_coherent_stack

	/* ---------------------------------------------
	 * Perform early platform setup & platform
	 * specific early arch. setup e.g. mmu setup
	 * ---------------------------------------------
	 */
	mov	x0, x21
	mov	x1, x22
	bl	bl2_early_platform_setup
	bl	bl2_plat_arch_setup

	/* ---------------------------------------------
	 * Give ourselves a stack allocated in Normal
	 * -IS-WBWA memory
	 * ---------------------------------------------
	 */
	mov	x0, x19
	bl	platform_set_stack

	/* ---------------------------------------------
	 * Jump to main function.
	 * ---------------------------------------------
	 */
	bl	bl2_main
_panic:
	b	_panic