/******************************************************************************
 *
 * Copyright (C) 2022-2023 Maxim Integrated Products, Inc. (now owned by 
 * Analog Devices, Inc.),
 * Copyright (C) 2023-2024 Analog Devices, Inc.
 *
 * 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
 *
 *     http://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 <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "max78002.h"
#include "gcr_regs.h"
#include "mxc_sys.h"

volatile uint32_t mailbox __attribute__((section(".mailbox")));
uint32_t SystemCoreClock __attribute__((section(".shared")));

/*
The libc implementation from GCC 11+ depends on _getpid and _kill in some places.
There is no concept of processes/PIDs in the baremetal PeriphDrivers, therefore
we implement stub functions that return an error code to resolve linker warnings.
*/
__weak int _getpid(void)
{
    return E_NOT_SUPPORTED;
}

__weak int _kill(void)
{
    return E_NOT_SUPPORTED;
}

void __enable_irq(void)
{
    // Set the MIE bit if we're outside the interrupt context
    __asm volatile("csrw mstatus, 0x8");
}

__weak void SystemCoreClockUpdate(void)
{
    // uint32_t base_freq, div, clk_src;

    // ARM core does this stuff for us
}

/* This function is called before C runtime initialization and can be
 * implemented by the application for early initializations. If a value other
 * than '0' is returned, the C runtime initialization will be skipped.
 *
 * You may over-ride this function in your program by defining a custom 
 *  PreInit(), but care should be taken to reproduce the initilization steps
 *  or a non-functional system may result.
 */
__weak int PreInit(void)
{
    /* Do nothing */
    return 0;
}

/* This function can be implemented by the application to initialize the board */
__weak int Board_Init(void)
{
    /* Do nothing */
    return 0;
}

/* This function is called just before control is transferred to main().
 *
 * You may over-ride this function in your program by defining a custom 
 *  SystemInit(), but care should be taken to reproduce the initialization
 *  steps or a non-functional system may result.
 */
__weak void SystemInit(void)
{
    // ARM core does this stuff for us
    // but riscv needs variables initialized
    SystemCoreClockUpdate();

    Board_Init();
}