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u-boot/common/console.c
Siarhei Siamashka 2766966750 console: Use pre-console buffer to get complete log on all consoles 
Currently the pre-console buffer can accumulate early log messages
and flush them to the serial console as soon as it becomes available.

This patch just adds one more pre-console buffer flushing point and
does all the same for the other consoles too. This is particularly
useful for the vga/hdmi/lcd console, where we can see all the older
messages now (except for the log messages from SPL).

Naturally, we don't want to get an extra copy of the log messages
on the serial console again at the second flushing point, so the
serial console has to be explicitly filtered out.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Tom Rini <trini@ti.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2015-01-14 14:56:40 +01:00

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/*
* (C) Copyright 2000
* Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <stdarg.h>
#include <iomux.h>
#include <malloc.h>
#include <os.h>
#include <serial.h>
#include <stdio_dev.h>
#include <exports.h>
#include <environment.h>
DECLARE_GLOBAL_DATA_PTR;
static int on_console(const char *name, const char *value, enum env_op op,
int flags)
{
int console = -1;
/* Check for console redirection */
if (strcmp(name, "stdin") == 0)
console = stdin;
else if (strcmp(name, "stdout") == 0)
console = stdout;
else if (strcmp(name, "stderr") == 0)
console = stderr;
/* if not actually setting a console variable, we don't care */
if (console == -1 || (gd->flags & GD_FLG_DEVINIT) == 0)
return 0;
switch (op) {
case env_op_create:
case env_op_overwrite:
#ifdef CONFIG_CONSOLE_MUX
if (iomux_doenv(console, value))
return 1;
#else
/* Try assigning specified device */
if (console_assign(console, value) < 0)
return 1;
#endif /* CONFIG_CONSOLE_MUX */
return 0;
case env_op_delete:
if ((flags & H_FORCE) == 0)
printf("Can't delete \"%s\"\n", name);
return 1;
default:
return 0;
}
}
U_BOOT_ENV_CALLBACK(console, on_console);
#ifdef CONFIG_SILENT_CONSOLE
static int on_silent(const char *name, const char *value, enum env_op op,
int flags)
{
#ifndef CONFIG_SILENT_CONSOLE_UPDATE_ON_SET
if (flags & H_INTERACTIVE)
return 0;
#endif
#ifndef CONFIG_SILENT_CONSOLE_UPDATE_ON_RELOC
if ((flags & H_INTERACTIVE) == 0)
return 0;
#endif
if (value != NULL)
gd->flags |= GD_FLG_SILENT;
else
gd->flags &= ~GD_FLG_SILENT;
return 0;
}
U_BOOT_ENV_CALLBACK(silent, on_silent);
#endif
#ifdef CONFIG_SYS_CONSOLE_IS_IN_ENV
/*
* if overwrite_console returns 1, the stdin, stderr and stdout
* are switched to the serial port, else the settings in the
* environment are used
*/
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console(void);
#define OVERWRITE_CONSOLE overwrite_console()
#else
#define OVERWRITE_CONSOLE 0
#endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */
#endif /* CONFIG_SYS_CONSOLE_IS_IN_ENV */
static int console_setfile(int file, struct stdio_dev * dev)
{
int error = 0;
if (dev == NULL)
return -1;
switch (file) {
case stdin:
case stdout:
case stderr:
/* Start new device */
if (dev->start) {
error = dev->start(dev);
/* If it's not started dont use it */
if (error < 0)
break;
}
/* Assign the new device (leaving the existing one started) */
stdio_devices[file] = dev;
/*
* Update monitor functions
* (to use the console stuff by other applications)
*/
switch (file) {
case stdin:
gd->jt[XF_getc] = getc;
gd->jt[XF_tstc] = tstc;
break;
case stdout:
gd->jt[XF_putc] = putc;
gd->jt[XF_puts] = puts;
gd->jt[XF_printf] = printf;
break;
}
break;
default: /* Invalid file ID */
error = -1;
}
return error;
}
#if defined(CONFIG_CONSOLE_MUX)
/** Console I/O multiplexing *******************************************/
static struct stdio_dev *tstcdev;
struct stdio_dev **console_devices[MAX_FILES];
int cd_count[MAX_FILES];
/*
* This depends on tstc() always being called before getc().
* This is guaranteed to be true because this routine is called
* only from fgetc() which assures it.
* No attempt is made to demultiplex multiple input sources.
*/
static int console_getc(int file)
{
unsigned char ret;
/* This is never called with testcdev == NULL */
ret = tstcdev->getc(tstcdev);
tstcdev = NULL;
return ret;
}
static int console_tstc(int file)
{
int i, ret;
struct stdio_dev *dev;
disable_ctrlc(1);
for (i = 0; i < cd_count[file]; i++) {
dev = console_devices[file][i];
if (dev->tstc != NULL) {
ret = dev->tstc(dev);
if (ret > 0) {
tstcdev = dev;
disable_ctrlc(0);
return ret;
}
}
}
disable_ctrlc(0);
return 0;
}
static void console_putc(int file, const char c)
{
int i;
struct stdio_dev *dev;
for (i = 0; i < cd_count[file]; i++) {
dev = console_devices[file][i];
if (dev->putc != NULL)
dev->putc(dev, c);
}
}
#ifdef CONFIG_PRE_CONSOLE_BUFFER
static void console_putc_noserial(int file, const char c)
{
int i;
struct stdio_dev *dev;
for (i = 0; i < cd_count[file]; i++) {
dev = console_devices[file][i];
if (dev->putc != NULL && strcmp(dev->name, "serial") != 0)
dev->putc(dev, c);
}
}
#endif
static void console_puts(int file, const char *s)
{
int i;
struct stdio_dev *dev;
for (i = 0; i < cd_count[file]; i++) {
dev = console_devices[file][i];
if (dev->puts != NULL)
dev->puts(dev, s);
}
}
static inline void console_printdevs(int file)
{
iomux_printdevs(file);
}
static inline void console_doenv(int file, struct stdio_dev *dev)
{
iomux_doenv(file, dev->name);
}
#else
static inline int console_getc(int file)
{
return stdio_devices[file]->getc(stdio_devices[file]);
}
static inline int console_tstc(int file)
{
return stdio_devices[file]->tstc(stdio_devices[file]);
}
static inline void console_putc(int file, const char c)
{
stdio_devices[file]->putc(stdio_devices[file], c);
}
#ifdef CONFIG_PRE_CONSOLE_BUFFER
static inline void console_putc_noserial(int file, const char c)
{
if (strcmp(stdio_devices[file]->name, "serial") != 0)
stdio_devices[file]->putc(stdio_devices[file], c);
}
#endif
static inline void console_puts(int file, const char *s)
{
stdio_devices[file]->puts(stdio_devices[file], s);
}
static inline void console_printdevs(int file)
{
printf("%s\n", stdio_devices[file]->name);
}
static inline void console_doenv(int file, struct stdio_dev *dev)
{
console_setfile(file, dev);
}
#endif /* defined(CONFIG_CONSOLE_MUX) */
/** U-Boot INITIAL CONSOLE-NOT COMPATIBLE FUNCTIONS *************************/
int serial_printf(const char *fmt, ...)
{
va_list args;
uint i;
char printbuffer[CONFIG_SYS_PBSIZE];
va_start(args, fmt);
/* For this to work, printbuffer must be larger than
* anything we ever want to print.
*/
i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
va_end(args);
serial_puts(printbuffer);
return i;
}
int fgetc(int file)
{
if (file < MAX_FILES) {
#if defined(CONFIG_CONSOLE_MUX)
/*
* Effectively poll for input wherever it may be available.
*/
for (;;) {
/*
* Upper layer may have already called tstc() so
* check for that first.
*/
if (tstcdev != NULL)
return console_getc(file);
console_tstc(file);
#ifdef CONFIG_WATCHDOG
/*
* If the watchdog must be rate-limited then it should
* already be handled in board-specific code.
*/
udelay(1);
#endif
}
#else
return console_getc(file);
#endif
}
return -1;
}
int ftstc(int file)
{
if (file < MAX_FILES)
return console_tstc(file);
return -1;
}
void fputc(int file, const char c)
{
if (file < MAX_FILES)
console_putc(file, c);
}
void fputs(int file, const char *s)
{
if (file < MAX_FILES)
console_puts(file, s);
}
int fprintf(int file, const char *fmt, ...)
{
va_list args;
uint i;
char printbuffer[CONFIG_SYS_PBSIZE];
va_start(args, fmt);
/* For this to work, printbuffer must be larger than
* anything we ever want to print.
*/
i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
va_end(args);
/* Send to desired file */
fputs(file, printbuffer);
return i;
}
/** U-Boot INITIAL CONSOLE-COMPATIBLE FUNCTION *****************************/
int getc(void)
{
#ifdef CONFIG_DISABLE_CONSOLE
if (gd->flags & GD_FLG_DISABLE_CONSOLE)
return 0;
#endif
if (!gd->have_console)
return 0;
if (gd->flags & GD_FLG_DEVINIT) {
/* Get from the standard input */
return fgetc(stdin);
}
/* Send directly to the handler */
return serial_getc();
}
int tstc(void)
{
#ifdef CONFIG_DISABLE_CONSOLE
if (gd->flags & GD_FLG_DISABLE_CONSOLE)
return 0;
#endif
if (!gd->have_console)
return 0;
if (gd->flags & GD_FLG_DEVINIT) {
/* Test the standard input */
return ftstc(stdin);
}
/* Send directly to the handler */
return serial_tstc();
}
#define PRE_CONSOLE_FLUSHPOINT1_SERIAL 0
#define PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL 1
#ifdef CONFIG_PRE_CONSOLE_BUFFER
#define CIRC_BUF_IDX(idx) ((idx) % (unsigned long)CONFIG_PRE_CON_BUF_SZ)
static void pre_console_putc(const char c)
{
char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
buffer[CIRC_BUF_IDX(gd->precon_buf_idx++)] = c;
}
static void pre_console_puts(const char *s)
{
while (*s)
pre_console_putc(*s++);
}
static void print_pre_console_buffer(int flushpoint)
{
unsigned long i = 0;
char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
if (gd->precon_buf_idx > CONFIG_PRE_CON_BUF_SZ)
i = gd->precon_buf_idx - CONFIG_PRE_CON_BUF_SZ;
while (i < gd->precon_buf_idx)
switch (flushpoint) {
case PRE_CONSOLE_FLUSHPOINT1_SERIAL:
putc(buffer[CIRC_BUF_IDX(i++)]);
break;
case PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL:
console_putc_noserial(stdout,
buffer[CIRC_BUF_IDX(i++)]);
break;
}
}
#else
static inline void pre_console_putc(const char c) {}
static inline void pre_console_puts(const char *s) {}
static inline void print_pre_console_buffer(int flushpoint) {}
#endif
void putc(const char c)
{
#ifdef CONFIG_SANDBOX
if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
os_putc(c);
return;
}
#endif
#ifdef CONFIG_SILENT_CONSOLE
if (gd->flags & GD_FLG_SILENT)
return;
#endif
#ifdef CONFIG_DISABLE_CONSOLE
if (gd->flags & GD_FLG_DISABLE_CONSOLE)
return;
#endif
if (!gd->have_console)
return pre_console_putc(c);
if (gd->flags & GD_FLG_DEVINIT) {
/* Send to the standard output */
fputc(stdout, c);
} else {
/* Send directly to the handler */
pre_console_putc(c);
serial_putc(c);
}
}
void puts(const char *s)
{
#ifdef CONFIG_SANDBOX
if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
os_puts(s);
return;
}
#endif
#ifdef CONFIG_SILENT_CONSOLE
if (gd->flags & GD_FLG_SILENT)
return;
#endif
#ifdef CONFIG_DISABLE_CONSOLE
if (gd->flags & GD_FLG_DISABLE_CONSOLE)
return;
#endif
if (!gd->have_console)
return pre_console_puts(s);
if (gd->flags & GD_FLG_DEVINIT) {
/* Send to the standard output */
fputs(stdout, s);
} else {
/* Send directly to the handler */
pre_console_puts(s);
serial_puts(s);
}
}
int printf(const char *fmt, ...)
{
va_list args;
uint i;
char printbuffer[CONFIG_SYS_PBSIZE];
#if !defined(CONFIG_SANDBOX) && !defined(CONFIG_PRE_CONSOLE_BUFFER)
if (!gd->have_console)
return 0;
#endif
va_start(args, fmt);
/* For this to work, printbuffer must be larger than
* anything we ever want to print.
*/
i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
va_end(args);
/* Print the string */
puts(printbuffer);
return i;
}
int vprintf(const char *fmt, va_list args)
{
uint i;
char printbuffer[CONFIG_SYS_PBSIZE];
#if defined(CONFIG_PRE_CONSOLE_BUFFER) && !defined(CONFIG_SANDBOX)
if (!gd->have_console)
return 0;
#endif
/* For this to work, printbuffer must be larger than
* anything we ever want to print.
*/
i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
/* Print the string */
puts(printbuffer);
return i;
}
/* test if ctrl-c was pressed */
static int ctrlc_disabled = 0; /* see disable_ctrl() */
static int ctrlc_was_pressed = 0;
int ctrlc(void)
{
#ifndef CONFIG_SANDBOX
if (!ctrlc_disabled && gd->have_console) {
if (tstc()) {
switch (getc()) {
case 0x03: /* ^C - Control C */
ctrlc_was_pressed = 1;
return 1;
default:
break;
}
}
}
#endif
return 0;
}
/* Reads user's confirmation.
Returns 1 if user's input is "y", "Y", "yes" or "YES"
*/
int confirm_yesno(void)
{
int i;
char str_input[5];
/* Flush input */
while (tstc())
getc();
i = 0;
while (i < sizeof(str_input)) {
str_input[i] = getc();
putc(str_input[i]);
if (str_input[i] == '\r')
break;
i++;
}
putc('\n');
if (strncmp(str_input, "y\r", 2) == 0 ||
strncmp(str_input, "Y\r", 2) == 0 ||
strncmp(str_input, "yes\r", 4) == 0 ||
strncmp(str_input, "YES\r", 4) == 0)
return 1;
return 0;
}
/* pass 1 to disable ctrlc() checking, 0 to enable.
* returns previous state
*/
int disable_ctrlc(int disable)
{
int prev = ctrlc_disabled; /* save previous state */
ctrlc_disabled = disable;
return prev;
}
int had_ctrlc (void)
{
return ctrlc_was_pressed;
}
void clear_ctrlc(void)
{
ctrlc_was_pressed = 0;
}
#ifdef CONFIG_MODEM_SUPPORT_DEBUG
char screen[1024];
char *cursor = screen;
int once = 0;
inline void dbg(const char *fmt, ...)
{
va_list args;
uint i;
char printbuffer[CONFIG_SYS_PBSIZE];
if (!once) {
memset(screen, 0, sizeof(screen));
once++;
}
va_start(args, fmt);
/* For this to work, printbuffer must be larger than
* anything we ever want to print.
*/
i = vsnprintf(printbuffer, sizeof(printbuffer), fmt, args);
va_end(args);
if ((screen + sizeof(screen) - 1 - cursor)
< strlen(printbuffer) + 1) {
memset(screen, 0, sizeof(screen));
cursor = screen;
}
sprintf(cursor, printbuffer);
cursor += strlen(printbuffer);
}
#else
static inline void dbg(const char *fmt, ...)
{
}
#endif
/** U-Boot INIT FUNCTIONS *************************************************/
struct stdio_dev *search_device(int flags, const char *name)
{
struct stdio_dev *dev;
dev = stdio_get_by_name(name);
if (dev && (dev->flags & flags))
return dev;
return NULL;
}
int console_assign(int file, const char *devname)
{
int flag;
struct stdio_dev *dev;
/* Check for valid file */
switch (file) {
case stdin:
flag = DEV_FLAGS_INPUT;
break;
case stdout:
case stderr:
flag = DEV_FLAGS_OUTPUT;
break;
default:
return -1;
}
/* Check for valid device name */
dev = search_device(flag, devname);
if (dev)
return console_setfile(file, dev);
return -1;
}
/* Called before relocation - use serial functions */
int console_init_f(void)
{
gd->have_console = 1;
#ifdef CONFIG_SILENT_CONSOLE
if (getenv("silent") != NULL)
gd->flags |= GD_FLG_SILENT;
#endif
print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT1_SERIAL);
return 0;
}
void stdio_print_current_devices(void)
{
/* Print information */
puts("In: ");
if (stdio_devices[stdin] == NULL) {
puts("No input devices available!\n");
} else {
printf ("%s\n", stdio_devices[stdin]->name);
}
puts("Out: ");
if (stdio_devices[stdout] == NULL) {
puts("No output devices available!\n");
} else {
printf ("%s\n", stdio_devices[stdout]->name);
}
puts("Err: ");
if (stdio_devices[stderr] == NULL) {
puts("No error devices available!\n");
} else {
printf ("%s\n", stdio_devices[stderr]->name);
}
}
#ifdef CONFIG_SYS_CONSOLE_IS_IN_ENV
/* Called after the relocation - use desired console functions */
int console_init_r(void)
{
char *stdinname, *stdoutname, *stderrname;
struct stdio_dev *inputdev = NULL, *outputdev = NULL, *errdev = NULL;
#ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
int i;
#endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
#ifdef CONFIG_CONSOLE_MUX
int iomux_err = 0;
#endif
/* set default handlers at first */
gd->jt[XF_getc] = serial_getc;
gd->jt[XF_tstc] = serial_tstc;
gd->jt[XF_putc] = serial_putc;
gd->jt[XF_puts] = serial_puts;
gd->jt[XF_printf] = serial_printf;
/* stdin stdout and stderr are in environment */
/* scan for it */
stdinname = getenv("stdin");
stdoutname = getenv("stdout");
stderrname = getenv("stderr");
if (OVERWRITE_CONSOLE == 0) { /* if not overwritten by config switch */
inputdev = search_device(DEV_FLAGS_INPUT, stdinname);
outputdev = search_device(DEV_FLAGS_OUTPUT, stdoutname);
errdev = search_device(DEV_FLAGS_OUTPUT, stderrname);
#ifdef CONFIG_CONSOLE_MUX
iomux_err = iomux_doenv(stdin, stdinname);
iomux_err += iomux_doenv(stdout, stdoutname);
iomux_err += iomux_doenv(stderr, stderrname);
if (!iomux_err)
/* Successful, so skip all the code below. */
goto done;
#endif
}
/* if the devices are overwritten or not found, use default device */
if (inputdev == NULL) {
inputdev = search_device(DEV_FLAGS_INPUT, "serial");
}
if (outputdev == NULL) {
outputdev = search_device(DEV_FLAGS_OUTPUT, "serial");
}
if (errdev == NULL) {
errdev = search_device(DEV_FLAGS_OUTPUT, "serial");
}
/* Initializes output console first */
if (outputdev != NULL) {
/* need to set a console if not done above. */
console_doenv(stdout, outputdev);
}
if (errdev != NULL) {
/* need to set a console if not done above. */
console_doenv(stderr, errdev);
}
if (inputdev != NULL) {
/* need to set a console if not done above. */
console_doenv(stdin, inputdev);
}
#ifdef CONFIG_CONSOLE_MUX
done:
#endif
#ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
stdio_print_current_devices();
#endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
#ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
/* set the environment variables (will overwrite previous env settings) */
for (i = 0; i < 3; i++) {
setenv(stdio_names[i], stdio_devices[i]->name);
}
#endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
gd->flags |= GD_FLG_DEVINIT; /* device initialization completed */
#if 0
/* If nothing usable installed, use only the initial console */
if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
return 0;
#endif
print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
return 0;
}
#else /* CONFIG_SYS_CONSOLE_IS_IN_ENV */
/* Called after the relocation - use desired console functions */
int console_init_r(void)
{
struct stdio_dev *inputdev = NULL, *outputdev = NULL;
int i;
struct list_head *list = stdio_get_list();
struct list_head *pos;
struct stdio_dev *dev;
#ifdef CONFIG_SPLASH_SCREEN
/*
* suppress all output if splash screen is enabled and we have
* a bmp to display. We redirect the output from frame buffer
* console to serial console in this case or suppress it if
* "silent" mode was requested.
*/
if (getenv("splashimage") != NULL) {
if (!(gd->flags & GD_FLG_SILENT))
outputdev = search_device (DEV_FLAGS_OUTPUT, "serial");
}
#endif
/* Scan devices looking for input and output devices */
list_for_each(pos, list) {
dev = list_entry(pos, struct stdio_dev, list);
if ((dev->flags & DEV_FLAGS_INPUT) && (inputdev == NULL)) {
inputdev = dev;
}
if ((dev->flags & DEV_FLAGS_OUTPUT) && (outputdev == NULL)) {
outputdev = dev;
}
if(inputdev && outputdev)
break;
}
/* Initializes output console first */
if (outputdev != NULL) {
console_setfile(stdout, outputdev);
console_setfile(stderr, outputdev);
#ifdef CONFIG_CONSOLE_MUX
console_devices[stdout][0] = outputdev;
console_devices[stderr][0] = outputdev;
#endif
}
/* Initializes input console */
if (inputdev != NULL) {
console_setfile(stdin, inputdev);
#ifdef CONFIG_CONSOLE_MUX
console_devices[stdin][0] = inputdev;
#endif
}
#ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
stdio_print_current_devices();
#endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
/* Setting environment variables */
for (i = 0; i < 3; i++) {
setenv(stdio_names[i], stdio_devices[i]->name);
}
gd->flags |= GD_FLG_DEVINIT; /* device initialization completed */
#if 0
/* If nothing usable installed, use only the initial console */
if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
return 0;
#endif
print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
return 0;
}
#endif /* CONFIG_SYS_CONSOLE_IS_IN_ENV */
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