/*
 * Copyright (C) 2017-2019 Alibaba Group Holding Limited. All rights reserved.
 *
 * 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.
 */


 /******************************************************************************
 * @file     startup.S
 * @brief    startup file. Should use with
 *           GCC for CSKY Embedded Processors
 * @version  V1.0
 * @date     29. July 2019
 ******************************************************************************/

#include <csi_config.h>

.section .vectors, "aw", @progbits
    .align  6
    .globl  __Vectors
    .type   __Vectors, @object
__Vectors:
#if 0
    .rept   256
    .long   freertos_risc_v_trap_handler
    .endr
#endif
#if 1
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_Handler
#ifndef CONFIG_KERNEL_NONE
    .long   freertos_risc_v_trap_handler
#else
    .long   Default_Handler
#endif 
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_IRQHandler
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_Handler
    .long   Default_Handler

    /* External interrupts */
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
    .long   Default_IRQHandler
#endif

    .text
    .align  2
_start:
    .text
    .align  2
    .globl  Reset_Handler
    .type   Reset_Handler, %function
Reset_Handler:
.option push
.option norelax
    la      gp, __global_pointer$
.option pop
    la      a0, Default_Handler
    ori     a0, a0, 3
    csrw    mtvec, a0

    la      a0, __Vectors
    csrw    mtvt, a0

    la      sp, g_top_irqstack
    csrw    mscratch, sp

    /* Load data section */
    la      a0, __erodata
    la      a1, __data_start__
    la      a2, __data_end__
    bgeu    a1, a2, 2f
1:
    lw      t0, (a0)
    sw      t0, (a1)
    addi    a0, a0, 4
    addi    a1, a1, 4
    bltu    a1, a2, 1b
2:

    /* Clear bss section */
    la      a0, __bss_start__
    la      a1, __bss_end__
    bgeu    a0, a1, 2f
1:
    sw      zero, (a0)
    addi    a0, a0, 4
    bltu    a0, a1, 1b
2:

#ifndef __NO_SYSTEM_INIT
    jal     SystemInit
#endif

#ifndef __NO_BOARD_INIT
    jal     board_init
#endif

    jal     main

    .size   Reset_Handler, . - Reset_Handler

__exit:
    j      __exit

.section .bss

    .align  3
    .global g_base_irqstack
    .global g_top_irqstack
g_base_irqstack:
    .space CONFIG_ARCH_INTERRUPTSTACK
g_top_irqstack:

    .align  3
    .global __freertos_irq_stack_top
    .space CONFIG_ARCH_INTERRUPTSTACK
__freertos_irq_stack_top: