/*
 * Copyright (c) 2013-2019, Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020, Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch/sys_arch.h>
#include <lwip/sys.h>
#include <lwip/debug.h>
#include <los_task.h>
#include <los_sys_pri.h>
#include <los_tick.h>
#include <los_queue.h>
#include <los_sem.h>
#include <los_mux.h>
#include <los_spinlock.h>

#if (LOSCFG_KERNEL_SMP == YES)
SPIN_LOCK_INIT(arch_protect_spin);
static u32_t lwprot_thread = LOS_ERRNO_TSK_ID_INVALID;
static int lwprot_count = 0;
#endif /* LOSCFG_KERNEL_SMP == YES */


/**
 * Thread and System misc
 */

sys_thread_t sys_thread_new(const char *name, lwip_thread_fn thread, void *arg, int stackSize, int prio)
{
    UINT32 taskID = LOS_ERRNO_TSK_ID_INVALID;
    UINT32 ret;
    TSK_INIT_PARAM_S task = {0};

    /* Create host Task */
    task.pfnTaskEntry = (TSK_ENTRY_FUNC)thread;
    task.uwStackSize  = stackSize;
    task.pcName = (char *)name;
    task.usTaskPrio = prio;
    task.auwArgs[0] = (UINTPTR)arg;
    task.uwResved   = LOS_TASK_STATUS_DETACHED;
    ret = LOS_TaskCreate(&taskID, &task);
    if (ret != LOS_OK) {
        LWIP_DEBUGF(SYS_DEBUG, ("sys_thread_new: LOS_TaskCreate error %u\n", ret));
        return -1;
    }

    return taskID;
}

void sys_init(void)
{
    /* set rand seed to make random sequence diff on every startup */
    UINT32 seedhsb, seedlsb;
    LOS_GetCpuCycle(&seedhsb, &seedlsb);
    srand(seedlsb);
}

u32_t sys_now(void)
{
    /* Lwip docs mentioned like wraparound is not a problem in this funtion */
    return (u32_t)(((double)LOS_TickCountGet() * OS_SYS_MS_PER_SECOND) / LOSCFG_BASE_CORE_TICK_PER_SECOND);
}


/**
 * Protector
 */

sys_prot_t sys_arch_protect(void)
{
#if (LOSCFG_KERNEL_SMP == YES)
    /* Note that we are using spinlock instead of mutex for LiteOS-SMP here:
     * 1. spinlock is more effective for short critical region protection.
     * 2. this function is called only in task context, not in interrupt handler.
     *    so it's not needed to disable interrupt.
     */
    if (lwprot_thread != LOS_CurTaskIDGet()) {
        /* We are locking the spinlock where it has not been locked before
         * or is being locked by another thread */
        LOS_SpinLock(&arch_protect_spin);
        lwprot_thread = LOS_CurTaskIDGet();
        lwprot_count = 1;
    } else {
        /* It is already locked by THIS thread */
        lwprot_count++;
    }
#else
    LOS_TaskLock();
#endif /* LOSCFG_KERNEL_SMP == YES */
    return 0; /* return value is unused */
}

void sys_arch_unprotect(sys_prot_t pval)
{
    LWIP_UNUSED_ARG(pval);
#if (LOSCFG_KERNEL_SMP == YES)
    if (lwprot_thread == LOS_CurTaskIDGet()) {
        lwprot_count--;
        if (lwprot_count == 0) {
            lwprot_thread = LOS_ERRNO_TSK_ID_INVALID;
            LOS_SpinUnlock(&arch_protect_spin);
        }
    }
#else
    LOS_TaskUnlock();
#endif /* LOSCFG_KERNEL_SMP == YES */
}


/**
 * MessageBox
 */

err_t sys_mbox_new(sys_mbox_t *mbox, int size)
{
    CHAR qName[] = "lwIP";
    UINT32 ret = LOS_QueueCreate(qName, (UINT16)size, mbox, 0, sizeof(void*));
    switch (ret) {
        case LOS_OK:
            return ERR_OK;
        case LOS_ERRNO_QUEUE_CB_UNAVAILABLE:
        case LOS_ERRNO_QUEUE_CREATE_NO_MEMORY:
            return ERR_MEM;
        default:
            break;
    }
    LWIP_DEBUGF(SYS_DEBUG, ("%s: LOS_QueueCreate error %u\n", __FUNCTION__, ret));
    return ERR_ARG;
}

void sys_mbox_post(sys_mbox_t *mbox, void *msg)
{
    /* Caution: the second parameter is NOT &msg */
    UINT32 ret = LOS_QueueWrite(*mbox, msg, sizeof(char *), LOS_WAIT_FOREVER);
    if (ret != LOS_OK) {
        LWIP_DEBUGF(SYS_DEBUG, ("%s: LOS_QueueWrite error %u\n", __FUNCTION__, ret));
    }
}

err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg)
{
    /* Caution: the second parameter is NOT &msg */
    UINT32 ret = LOS_QueueWrite(*mbox, msg, sizeof(char *), 0);
    switch (ret) {
        case LOS_OK:
            return ERR_OK;
        case LOS_ERRNO_QUEUE_ISFULL:
            return ERR_MEM;
        default:
            break;
    }
    LWIP_DEBUGF(SYS_DEBUG, ("%s: LOS_QueueWrite error %u\n", __FUNCTION__, ret));
    return ERR_ARG;
}

err_t sys_mbox_trypost_fromisr(sys_mbox_t *mbox, void *msg);

u32_t sys_arch_mbox_fetch(sys_mbox_t *mbox, void **msg, u32_t timeoutMs)
{
    void *ignore = 0; /* if msg==NULL, the fetched msg should be dropped */
    UINT64 tick = ((UINT64)timeoutMs * LOSCFG_BASE_CORE_TICK_PER_SECOND + OS_SYS_MS_PER_SECOND - 1) / OS_SYS_MS_PER_SECOND;
    UINT32 ret = LOS_QueueRead(*mbox, msg ? msg : &ignore, sizeof(void*), tick ? (UINT32)tick : LOS_WAIT_FOREVER);
    switch (ret) {
        case LOS_OK:
            return ERR_OK;
        case LOS_ERRNO_QUEUE_ISEMPTY:
        case LOS_ERRNO_QUEUE_TIMEOUT:
            return SYS_ARCH_TIMEOUT;
        default:
            break;
    }
    LWIP_DEBUGF(SYS_DEBUG, ("%s: LOS_QueueRead error %u\n", __FUNCTION__, ret));
    return SYS_ARCH_TIMEOUT; /* Errors should be treated as timeout */
}

u32_t sys_arch_mbox_tryfetch(sys_mbox_t *mbox, void **msg)
{
    void *ignore = 0; /* if msg==NULL, the fetched msg should be dropped */
    UINT32 ret = LOS_QueueRead(*mbox, msg ? msg : &ignore, sizeof(void*), 0);
    switch (ret) {
        case LOS_OK:
            return ERR_OK;
        case LOS_ERRNO_QUEUE_ISEMPTY:
            return SYS_MBOX_EMPTY;
        case LOS_ERRNO_QUEUE_TIMEOUT:
            return SYS_ARCH_TIMEOUT;
        default:
            break;
    }
    LWIP_DEBUGF(SYS_DEBUG, ("%s: LOS_QueueRead error %u\n", __FUNCTION__, ret));
    return SYS_MBOX_EMPTY; /* Errors should be treated as timeout */
}

void sys_mbox_free(sys_mbox_t *mbox)
{
    (void)LOS_QueueDelete(*mbox);
}

int sys_mbox_valid(sys_mbox_t *mbox)
{
    QUEUE_INFO_S queueInfo;
    return LOS_OK == LOS_QueueInfoGet(*mbox, &queueInfo);
}

void sys_mbox_set_invalid(sys_mbox_t *mbox)
{
    *mbox = LOSCFG_BASE_IPC_QUEUE_LIMIT;
}


/**
 * Semaphore
 */

err_t sys_sem_new(sys_sem_t *sem, u8_t count)
{
    UINT32 ret = LOS_SemCreate(count, sem);
    if (ret != LOS_OK) {
        return ERR_ARG;
    }

    return ERR_OK;
}

void sys_sem_signal(sys_sem_t *sem)
{
    (void)LOS_SemPost(*sem);
}

u32_t sys_arch_sem_wait(sys_sem_t *sem, u32_t timeoutMs)
{
    UINT64 tick = ((UINT64)timeoutMs * LOSCFG_BASE_CORE_TICK_PER_SECOND + OS_SYS_MS_PER_SECOND - 1) / OS_SYS_MS_PER_SECOND;
    UINT32 ret = LOS_SemPend(*sem, tick ? (UINT32)tick : LOS_WAIT_FOREVER); // timeoutMs 0 means wait forever
    switch (ret) {
        case LOS_OK:
            return ERR_OK;
        case LOS_ERRNO_SEM_TIMEOUT:
            return SYS_ARCH_TIMEOUT;
        default:
            break;
    }
    LWIP_DEBUGF(SYS_DEBUG, ("%s: LOS_SemPend error %u\n", __FUNCTION__, ret));
    return SYS_ARCH_TIMEOUT; /* Errors should be treated as timeout */
}

void sys_sem_free(sys_sem_t *sem)
{
    (void)LOS_SemDelete(*sem);
}

int sys_sem_valid(sys_sem_t *sem)
{
    return *sem != LOSCFG_BASE_IPC_SEM_LIMIT;
}

void sys_sem_set_invalid(sys_sem_t *sem)
{
    *sem = LOSCFG_BASE_IPC_SEM_LIMIT;
}


/**
 * Mutex
 */

err_t sys_mutex_new(sys_mutex_t *mutex)
{
    UINT32 ret = LOS_MuxInit(mutex, NULL);
    if (ret != LOS_OK) {
        return ERR_ARG;
    }

    return ERR_OK;
}

void sys_mutex_lock(sys_mutex_t *mutex)
{
    (void)LOS_MuxLock(mutex, LOS_WAIT_FOREVER);
}

void sys_mutex_unlock(sys_mutex_t *mutex)
{
    (void)LOS_MuxUnlock(mutex);
}

void sys_mutex_free(sys_mutex_t *mutex)
{
    (void)LOS_MuxDestroy(mutex);
}

int sys_mutex_valid(sys_mutex_t *mutex)
{
    return LOS_MuxIsValid(mutex);
}

void sys_mutex_set_invalid(sys_mutex_t *mutex)
{
    (void)LOS_MuxDestroy(mutex);
}