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/* Copyright 2019 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "config.h"
#include "console.h"
#include "hooks.h"
#include "task.h"
#include "timer.h"
#include "uart.h"
#include "usb_console.h"
#include "util.h"
#include "watchdog.h"
#ifndef SECTION_IS_RO
/**
* Some unit tests do not have a watchdog enabled and the watchdog
* functions are stubbed. Define a default watchdog period in this case.
*/
#ifdef CONFIG_WATCHDOG_PERIOD_MS
#define CHARGEN_WATCHDOG_PERIOD_MS CONFIG_WATCHDOG_PERIOD_MS
#else
#define CHARGEN_WATCHDOG_PERIOD_MS 1600
#endif
/*
* Microseconds time to drain entire UART_TX console buffer at 115200 b/s, 10
* bits per character.
*/
#define BUFFER_DRAIN_TIME_US \
(1000000UL * 10 * CONFIG_UART_TX_BUF_SIZE / CONFIG_UART_BAUD_RATE)
struct deferred_chargen_ctx {
int wrap_value;
uint32_t seq_number;
int (*putc)(int c);
int (*tx_is_blocked)(void);
};
static struct deferred_chargen_ctx chargen_ctx;
static void acquire_console(void)
{
#if !defined(CONFIG_USB_CONSOLE) && !defined(CONFIG_USB_CONSOLE_STREAM)
uart_shell_rx_bypass(true);
#endif
#if !defined(CONFIG_ZEPHYR) && !defined(BOARD_HOST)
/* The legacy fw console does not have an rx bypass feature (it is
* stubbed out). Disable the console task so that it does not
* steal character reads from chargen.
*/
if (task_start_called())
task_disable_task(TASK_ID_CONSOLE);
#endif /* !CONFIG_ZEPHYR && !BOARD_HOST */
}
static void release_console(void)
{
#if !defined(CONFIG_USB_CONSOLE) && !defined(CONFIG_USB_CONSOLE_STREAM)
uart_shell_rx_bypass(false);
#endif
#if !defined(CONFIG_ZEPHYR) && !defined(BOARD_HOST)
if (task_start_called())
task_enable_task(TASK_ID_CONSOLE);
#endif /* !CONFIG_ZEPHYR && !BOARD_HOST */
}
static void run_chargen(void)
{
int wrap_value = chargen_ctx.wrap_value;
uint32_t seq_number = chargen_ctx.seq_number;
int (*putc_)(int c) = chargen_ctx.putc;
int (*tx_is_blocked_)(void) = chargen_ctx.tx_is_blocked;
timestamp_t prev_watchdog_time;
uint8_t c = '0';
uint32_t seq_counter = 0;
int wrap_counter = 0;
acquire_console();
while (uart_getc() != -1 || usb_getc() != -1)
; /* Drain received characters, if any. */
prev_watchdog_time = get_time();
while (uart_getc() != 'x' && usb_getc() != 'x') {
timestamp_t current_time;
while (tx_is_blocked_()) {
/*
* Let's let other tasks run for a bit while buffer is
* being drained a little.
*/
usleep(BUFFER_DRAIN_TIME_US / 10);
current_time = get_time();
if ((current_time.val - prev_watchdog_time.val) <
(CHARGEN_WATCHDOG_PERIOD_MS * 1000 / 2))
continue;
watchdog_reload();
prev_watchdog_time.val = current_time.val;
}
if (IS_ENABLED(CONFIG_ZEPHYR) && c == '0')
watchdog_reload();
putc_(c++);
if (seq_number && (++seq_counter == seq_number))
break;
if (wrap_value && (++wrap_counter == wrap_value)) {
c = '0';
wrap_counter = 0;
continue;
}
if (c == ('z' + 1))
c = '0';
else if (c == ('Z' + 1))
c = 'a';
else if (c == ('9' + 1))
c = 'A';
}
putc_('\n');
release_console();
}
DECLARE_DEFERRED(run_chargen);
/*
* Generate a stream of characters on the UART (and USB) console.
*
* The stream is an ever incrementing pattern of characters from the following
* set: 0..9A..Za..z.
*
* The two optional integer command line arguments work as follows:
*
* argv[1] - reset the pattern after this many characters have been printed.
* Setting this value to the width of the terminal window results
* in a very regular stream showing on the terminal, where it is
* easy to observe disruptions.
* argv[2] - limit number of printed characters to this amount. If not
* specified - keep printing indefinitely.
*
* Hitting 'x' on the keyboard stops the generator.
*/
static int command_chargen(int argc, const char **argv)
{
int wrap_value = 0;
uint32_t seq_number = 0;
int (*putc_)(int c) = uart_putc;
int (*tx_is_blocked_)(void) = uart_buffer_full;
if (argc > 1)
wrap_value = atoi(argv[1]);
if (argc > 2)
seq_number = atoi(argv[2]);
#if defined(CONFIG_USB_CONSOLE) || defined(CONFIG_USB_CONSOLE_STREAM)
if (argc > 3) {
if (memcmp(argv[3], "usb", 3))
return EC_ERROR_PARAM3;
putc_ = usb_putc;
tx_is_blocked_ = usb_console_tx_blocked;
}
#endif
chargen_ctx.wrap_value = wrap_value;
chargen_ctx.seq_number = seq_number;
chargen_ctx.putc = putc_;
chargen_ctx.tx_is_blocked = tx_is_blocked_;
return hook_call_deferred(&run_chargen_data, 0);
}
DECLARE_SAFE_CONSOLE_COMMAND(chargen, command_chargen,
#if defined(CONFIG_USB_CONSOLE) || defined(CONFIG_USB_CONSOLE_STREAM)
"[seq_length [num_chars [usb]]]",
#else
"[seq_length [num_chars]]",
#endif
"Generate a constant stream of characters on the "
"UART console,\nrepeating every 'seq_length' "
"characters, up to 'num_chars' total.");
#endif /* !SECTION_IS_RO */
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