// SPDX-FileCopyrightText: 2020 Efabless Corporation
//
// 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.
// SPDX-License-Identifier: Apache-2.0


#include "defines.h"

#define STDOUT 0xd0580000


// Code to execute
.section .text
.global _start
_start:
 
  
  // li x1, 0x5f555555
 //  csrw 0x7c0, x1

     csrw minstret, zero
     csrw minstreth, zero

     li x4, 4        // Neccessary for terminating code
     csrw 0x7f9 ,x4  // Neccessary for terminating code
     
     
     li s0, 0xf0040000  //dccm base address
     //li s5,0xf0040100 //Queue Adress  

     addi s1,x0,5 //element 1 to push  INPUT   expected output should be 5 6 7 
     addi s2,x0,6 //element 2 to push  INPUT
     addi s3,x0,7 //element 3 to push  INPUT
         
     addi s4,x0,3 //size of queue      

     addi t0,x0,0 //counter initialization
     
     addi t1,x0,1 //
     addi t2,x0,2 //
     addi t3,x0,3 //
     
     jal ra,PUSH //JUMP to push elements
     j LOAD_QUEUE       //code will load Queue Elements

     PUSH:
     addi t0,t0,1 //counter increment
     beq t0,t1,PUSH1  //if count == 1 jump to push 1
     beq t0,t2,PUSH2  //if count == 2 jump to push 2
     beq t0,t3,PUSH3  //if count == 3 jump to push 3
     ret
     
     PUSH1:
     sw s1,0(s0) // save element 1 on first location of queue
     j PUSH      // jump to push function

     PUSH2:     
     sw s2,4(s0) // save element 2 on second location of queue
     j PUSH

     PUSH3:
     sw s3,8(s0) // save element 3 on third location of queue
     j PUSH

     LOAD_QUEUE:

     lw x5,0(s0) 
     lw x6,4(s0)
     lw x7,8(s0)
     
     li s6,STDOUT

     sw x5,0(s6)  //Sending element 1 to tb
     addi s6, s6, 4
     nop
     nop
     nop 
     nop
     sw x6,0(s6)  //Sending element 2 to tb
     addi s6, s6, 4
     nop
     nop
     nop
     sw x7,0(s6)  //Sending element 3 to tb
     nop
     nop
     nop
     

// Write 0xff to STDOUT for TB to termiate test.
_finish:
    li x3, STDOUT
    addi x5, x0, 0xff
    sb x5, 0(x3)
    beq x0, x0, _finish
.rept 100
    nop
.endr