cpu.c
1.77 KB
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
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2008 Texas Insturments
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
*/
#include <common.h>
#include <command.h>
#include <cpu_func.h>
#include <irq_func.h>
#include <asm/system.h>
#include <asm/secure.h>
#include <linux/compiler.h>
/*
* sdelay() - simple spin loop.
*
* Will delay execution by roughly (@loops * 2) cycles.
* This is necessary to be used before timers are accessible.
*
* A value of "0" will results in 2^64 loops.
*/
void sdelay(unsigned long loops)
{
__asm__ volatile ("1:\n" "subs %0, %0, #1\n"
"b.ne 1b" : "=r" (loops) : "0"(loops) : "cc");
}
void __weak board_cleanup_before_linux(void){}
int cleanup_before_linux(void)
{
/*
* this function is called just before we call linux
* it prepares the processor for linux
*
* disable interrupt and turn off caches etc ...
*/
board_cleanup_before_linux();
disable_interrupts();
/*
* Turn off I-cache and invalidate it
*/
icache_disable();
invalidate_icache_all();
/*
* turn off D-cache
* dcache_disable() in turn flushes the d-cache and disables MMU
*/
dcache_disable();
invalidate_dcache_all();
return 0;
}
#ifdef CONFIG_ARMV8_PSCI
static void relocate_secure_section(void)
{
#ifdef CONFIG_ARMV8_SECURE_BASE
size_t sz = __secure_end - __secure_start;
memcpy((void *)CONFIG_ARMV8_SECURE_BASE, __secure_start, sz);
flush_dcache_range(CONFIG_ARMV8_SECURE_BASE,
CONFIG_ARMV8_SECURE_BASE + sz + 1);
invalidate_icache_all();
#endif
}
void armv8_setup_psci(void)
{
relocate_secure_section();
secure_ram_addr(psci_setup_vectors)();
secure_ram_addr(psci_arch_init)();
}
#endif