xref: /openbmc/qemu/trace/simple.h (revision 1f966c7c)
1 /*
2  * Simple trace backend
3  *
4  * Copyright IBM, Corp. 2010
5  *
6  * This work is licensed under the terms of the GNU GPL, version 2.  See
7  * the COPYING file in the top-level directory.
8  *
9  */
10 
11 #ifndef TRACE_SIMPLE_H
12 #define TRACE_SIMPLE_H
13 
14 void st_print_trace_file_status(void);
15 bool st_set_trace_file_enabled(bool enable);
16 void st_set_trace_file(const char *file);
17 bool st_init(void);
18 void st_init_group(size_t group);
19 void st_flush_trace_buffer(void);
20 
21 typedef struct {
22     unsigned int tbuf_idx;
23     unsigned int rec_off;
24 } TraceBufferRecord;
25 
26 /* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */
27 #define MAX_TRACE_STRLEN 512
28 /**
29  * Initialize a trace record and claim space for it in the buffer
30  *
31  * @arglen  number of bytes required for arguments
32  */
33 int trace_record_start(TraceBufferRecord *rec, uint32_t id, size_t arglen);
34 
35 /**
36  * Append a 64-bit argument to a trace record
37  */
38 void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val);
39 
40 /**
41  * Append a string argument to a trace record
42  */
43 void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen);
44 
45 /**
46  * Mark a trace record completed
47  *
48  * Don't append any more arguments to the trace record after calling this.
49  */
50 void trace_record_finish(TraceBufferRecord *rec);
51 
52 #endif /* TRACE_SIMPLE_H */
53