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console: Add a way to output to serial only

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In the video drivers it is useful to print errors while debugging but
doing so risks an infinite loop as the debugging info itself may go
through the video drivers.

Add a new console function that prints information only to the serial
device, thus making it safe for use in debugging.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-07-02 21:12:13 -06:00 committed by Bin Meng
parent 3dada5a1a8
commit 493a4c8af7
2 changed files with 35 additions and 6 deletions
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28
common/console.c
View File

@ -229,18 +229,34 @@ static void console_putc(int file, const char c)
}
}
static void console_puts_noserial(int file, const char *s)
/**
* console_puts_select() - Output a string to all console devices
*
* @file: File number to output to (e,g, stdout, see stdio.h)
* @serial_only: true to output only to serial, false to output to everything
* else
* @s: String to output
*/
static void console_puts_select(int file, bool serial_only, const char *s)
{
int i;
struct stdio_dev *dev;
for (i = 0; i < cd_count[file]; i++) {
bool is_serial;
dev = console_devices[file][i];
if (dev->puts != NULL && !console_dev_is_serial(dev))
is_serial = console_dev_is_serial(dev);
if (dev->puts && serial_only == is_serial)
dev->puts(dev, s);
}
}
void console_puts_select_stderr(bool serial_only, const char *s)
{
console_puts_select(stderr, serial_only, s);
}
static void console_puts(int file, const char *s)
{
int i;
@ -275,9 +291,9 @@ static inline void console_putc(int file, const char c)
stdio_devices[file]->putc(stdio_devices[file], c);
}
static inline void console_puts_noserial(int file, const char *s)
void console_puts_select(int file, bool serial_only, const char *s)
{
if (!console_dev_is_serial(stdio_devices[file]))
if (serial_only == console_dev_is_serial(stdio_devices[file]))
stdio_devices[file]->puts(stdio_devices[file], s);
}
@ -489,7 +505,7 @@ static void print_pre_console_buffer(int flushpoint)
puts(buf_out);
break;
case PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL:
console_puts_noserial(stdout, buf_out);
console_puts_select(stdout, false, buf_out);
break;
}
}
@ -776,7 +792,7 @@ int console_announce_r(void)
display_options_get_banner(false, buf, sizeof(buf));
console_puts_noserial(stdout, buf);
console_puts_select(stdout, false, buf);
#endif
return 0;

13
include/console.h
View File

@ -7,6 +7,8 @@
#ifndef __CONSOLE_H
#define __CONSOLE_H
#include <stdbool.h>
extern char console_buffer[];
/* common/console.c */
@ -72,6 +74,17 @@ int console_record_avail(void);
*/
int console_announce_r(void);
/**
* console_puts_select_stderr() - Output a string to selected console devices
*
* This writes to stderr only. It is useful for outputting errors
*
* @serial_only: true to output only to serial, false to output to everything
* else
* @s: String to output
*/
void console_puts_select_stderr(bool serial_only, const char *s);
/*
* CONSOLE multiplexing.
*/