82 lines
1.7 KiB
ArmAsm
82 lines
1.7 KiB
ArmAsm
// SPDX-License-Identifier: Apache-2.0
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// Copyright 2019 Western Digital Corporation or its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Assembly code for Hello World
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// Not using only ALU ops for creating the string
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#include "defines.h"
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#define STDOUT 0xd0580000
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// Code to execute
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.section .text
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.global _start
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_start:
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// Clear minstret
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csrw minstret, zero
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csrw minstreth, zero
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// Set up MTVEC - not expecting to use it though
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li x1, RV_ICCM_SADR
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csrw mtvec, x1
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// Enable Caches in MRAC
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li x1, 0x5f555555
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csrw 0x7c0, x1
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// Load string from hw_data
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// and write to stdout address
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li x3, STDOUT
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la x4, hw_data
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loop:
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lb x5, 0(x4)
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sb x5, 0(x3)
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addi x4, x4, 1
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bnez x5, loop
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li x3, STDOUT
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la x4, hw_data
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loop2:
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lb x5, 0(x4)
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sb x5, 0(x3)
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addi x4, x4, 1
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bnez x5, loop2
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// Write 0xff to STDOUT for TB to terminate test.
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_finish:
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li x3, STDOUT
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addi x5, x0, 0xff
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sb x5, 0(x3)
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beq x0, x0, _finish
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.rept 100
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nop
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.endr
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.global hw_data
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.data
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hw_data:
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.ascii "----------------------------------\n"
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.ascii "Hello World Colin.liang EH1@WDC !!\n"
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.ascii "----------------------------------\n"
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.byte 0
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