1/*
2 * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * Neither the name of ARM nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific
16 * prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <asm_macros.S>
32#include <cpu_data.h>
33
34.globl	init_cpu_data_ptr
35.globl	_cpu_data_by_mpidr
36.globl	_cpu_data_by_index
37
38/* -----------------------------------------------------------------
39 * void init_cpu_data_ptr(void)
40 *
41 * Initialise the TPIDR_EL3 register to refer to the cpu_data_t
42 * for the calling CPU. This must be called before cm_get_cpu_data()
43 *
44 * This can be called without a valid stack.
45 * clobbers: x0, x1, x9, x10
46 * -----------------------------------------------------------------
47 */
48func init_cpu_data_ptr
49	mov	x10, x30
50	mrs	x0, mpidr_el1
51	bl	_cpu_data_by_mpidr
52	msr	tpidr_el3, x0
53	ret	x10
54
55
56/* -----------------------------------------------------------------
57 * cpu_data_t *_cpu_data_by_mpidr(uint64_t mpidr)
58 *
59 * Return the cpu_data structure for the CPU with given MPIDR
60 *
61 * This can be called without a valid stack. It assumes that
62 * platform_get_core_pos() does not clobber register x9.
63 * clobbers: x0, x1, x9
64 * -----------------------------------------------------------------
65 */
66func _cpu_data_by_mpidr
67	mov	x9, x30
68	bl	platform_get_core_pos
69	mov	x30, x9
70	b	_cpu_data_by_index
71
72
73/* -----------------------------------------------------------------
74 * cpu_data_t *_cpu_data_by_index(uint32_t cpu_index)
75 *
76 * Return the cpu_data structure for the CPU with given linear index
77 *
78 * This can be called without a valid stack.
79 * clobbers: x0, x1
80 * -----------------------------------------------------------------
81 */
82func _cpu_data_by_index
83	adr	x1, percpu_data
84	add	x0, x1, x0, LSL #CPU_DATA_LOG2SIZE
85	ret
86