quasar/demo/jtag.s

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2022-03-10 21:12:28 +08:00
// SPDX-License-Identifier: Apache-2.0
// Copyright 2019 Western Digital Corporation or its affiliates.
//
// 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.
//
// Assembly code for Hello World
// Not using only ALU ops for creating the string
#include "defines.h"
#define STDOUT 0xd0580000
// Code to execute
.section .text
.global _start
_start:
// Clear minstret
csrw minstret, zero
csrw minstreth, zero
// Set up MTVEC - not expecting to use it though
li x1, RV_ICCM_SADR
csrw mtvec, x1
// Enable Caches in MRAC
li x1, 0x5f555555
csrw 0x7c0, x1
// Load string from hw_data
// and write to stdout address
li x3, STDOUT
la x4, hw_data
loop:
lb x5, 0(x4)
sb x5, 0(x3)
addi x4, x4, 1
bnez x5, loop
li x3, STDOUT
la x4, hw_data
loop2:
lb x5, 0(x4)
sb x5, 0(x3)
addi x4, x4, 1
bnez x5, loop2
loop3:
beq x0, x0, loop3
// Write 0xff to STDOUT for TB to terminate test.
_finish:
li x3, STDOUT
addi x5, x0, 0xff
sb x5, 0(x3)
beq x0, x0, _finish
.rept 100
nop
.endr
.global hw_data
.data
hw_data:
.ascii "----------------------------------\n"
.ascii "Hello World Colin.liang EL2@WDC !!\n"
.ascii "----------------------------------\n"
.byte 0