test/hftest/ctrl_uart.c

/*
 * Copyright 2020 The Hafnium Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "hf/plat/console.h"

#include "test/hftest.h"

/* clang-format off */
#define CMD_GET_COMMAND_LINE	"[hftest_ctrl:get_command_line]\n"
#define CMD_FINISHED		"[hftest_ctrl:finished]\n"
/* clang-format on */

static char command_line[128];

static void write(const char *str)
{
	while (*str != '\0') {
		plat_console_putchar(*str);
		str++;
	}
}

static bool read(char *buf, size_t max_len, struct memiter *str)
{
	char c;
	size_t len = 0;

	while (true) {
		c = plat_console_getchar();
		if (c == '\r' || c == '\n') {
			memiter_init(str, buf, len);
			return true;
		}

		if (len < max_len) {
			buf[len++] = c;
		} else {
			return false;
		}
	}
}

bool hftest_ctrl_start(const struct fdt_header *fdt, struct memiter *cmd)
{
	(void)fdt;

	/* Let the console driver map its memory as device memory. */
	plat_console_mm_init(hftest_mm_get_stage1(), hftest_mm_get_ppool());

	/* Initialize the console */
	plat_console_init();

	/* Inform the host that we are ready to receive the command line. */
	write(CMD_GET_COMMAND_LINE);

	/* Read command line from the console. */
	read(command_line, ARRAY_SIZE(command_line), cmd);

	return true;
}

void hftest_ctrl_finish(void)
{
	/*
	 * Inform the host that this test has finished running and all
	 * subsequent logs belong to the next run.
	 */
	write(CMD_FINISHED);

	/* Reboot the device. */
	hftest_device_reboot();
}