/*
 * Copyright 2012-2020, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Ithamar R. Adema <ithamar@upgrade-android.com>
 */

#include <OS.h>
#include <boot/platform.h>
#include <boot/stdio.h>
#include <boot/kernel_args.h>
#include <boot/stage2.h>
#include <arch/cpu.h>
#include <arch_cpu_defs.h>
#include <arch_kernel.h>
#include <arch_system_info.h>
#include <string.h>


#define TRACE_CPU
#ifdef TRACE_CPU
#       define TRACE(x) dprintf x
#else
#       define TRACE(x) ;
#endif


/*! Detect RISCV core extensions.
*/
static status_t
check_cpu_features()
{
        // only seems possible from bootloader openfirmware or FDT?
        return B_OK;
}


extern "C" status_t
boot_arch_cpu_init(void)
{
        status_t err = check_cpu_features();
        if (err != B_OK) {
                panic("It's RISCY business trying to boot Haiku on the wrong CPU!\n");
                return err;
        }

        return B_OK;
}


extern "C" void
arch_ucode_load(BootVolume& volume)
{
        // NOP on riscv currently
}


extern "C" bigtime_t
system_time()
{
        // TODO: units conversion
        return CpuTime();
}


extern "C" void
spin(bigtime_t microseconds)
{
        bigtime_t time = system_time();
        while ((system_time() - time) < microseconds)
                asm volatile ("nop;");
}