1 // SPDX-License-Identifier: BSD-2-Clause
2 /*
3  * Copyright (c) 2014, Linaro Limited
4  */
5 #include <stdbool.h>
6 #include <trace.h>
7 #include <console.h>
8 #include <kernel/misc.h>
9 #include <kernel/spinlock.h>
10 #include <kernel/thread.h>
11 #include <mm/core_mmu.h>
12 
13 const char trace_ext_prefix[] = "TC";
14 int trace_level __nex_data = TRACE_LEVEL;
15 static unsigned int puts_lock __nex_bss = SPINLOCK_UNLOCK;
16 
plat_trace_ext_puts(const char * str __unused)17 void __weak plat_trace_ext_puts(const char *str __unused)
18 {
19 }
20 
trace_ext_puts(const char * str)21 void trace_ext_puts(const char *str)
22 {
23 	uint32_t itr_status = thread_mask_exceptions(THREAD_EXCP_ALL);
24 	bool mmu_enabled = cpu_mmu_enabled();
25 	bool was_contended = false;
26 	const char *p;
27 
28 	if (mmu_enabled && !cpu_spin_trylock(&puts_lock)) {
29 		was_contended = true;
30 		cpu_spin_lock_no_dldetect(&puts_lock);
31 	}
32 
33 	plat_trace_ext_puts(str);
34 
35 	console_flush();
36 
37 	if (was_contended)
38 		console_putc('*');
39 
40 	for (p = str; *p; p++)
41 		console_putc(*p);
42 
43 	console_flush();
44 
45 	if (mmu_enabled)
46 		cpu_spin_unlock(&puts_lock);
47 
48 	thread_unmask_exceptions(itr_status);
49 }
50 
trace_ext_get_thread_id(void)51 int trace_ext_get_thread_id(void)
52 {
53 	return thread_get_id_may_fail();
54 }
55 
trace_ext_get_core_id(void)56 int trace_ext_get_core_id(void)
57 {
58 	/* If foreign interrupts aren't masked we report invalid core ID */
59 	if (thread_get_exceptions() & THREAD_EXCP_FOREIGN_INTR)
60 		return get_core_pos();
61 	else
62 		return -1;
63 }
64