firmware/payloads/test_main.c

/*
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2019 Western Digital Corporation or its affiliates.
 *
 * Authors:
 *   Anup Patel <anup.patel@wdc.com>
 */

#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_string.h>

struct sbiret {
	unsigned long error;
	unsigned long value;
};

struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
			unsigned long arg1, unsigned long arg2,
			unsigned long arg3, unsigned long arg4,
			unsigned long arg5)
{
	struct sbiret ret;

	register unsigned long a0 asm ("a0") = (unsigned long)(arg0);
	register unsigned long a1 asm ("a1") = (unsigned long)(arg1);
	register unsigned long a2 asm ("a2") = (unsigned long)(arg2);
	register unsigned long a3 asm ("a3") = (unsigned long)(arg3);
	register unsigned long a4 asm ("a4") = (unsigned long)(arg4);
	register unsigned long a5 asm ("a5") = (unsigned long)(arg5);
	register unsigned long a6 asm ("a6") = (unsigned long)(fid);
	register unsigned long a7 asm ("a7") = (unsigned long)(ext);
	asm volatile ("ecall"
		      : "+r" (a0), "+r" (a1)
		      : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
		      : "memory");
	ret.error = a0;
	ret.value = a1;

	return ret;
}

static inline void sbi_ecall_console_puts(const char *str)
{
	sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE,
		  sbi_strlen(str), (unsigned long)str, 0, 0, 0, 0);
}

#define wfi()                                             \
	do {                                              \
		__asm__ __volatile__("wfi" ::: "memory"); \
	} while (0)

void test_main(unsigned long a0, unsigned long a1)
{
	sbi_ecall_console_puts("\nTest payload running\n");

	while (1)
		wfi();
}