94 lines
2.0 KiB
ArmAsm
94 lines
2.0 KiB
ArmAsm
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/*
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* Copyright (c) HiSilicon (Shanghai) Technologies Co., Ltd. 2021-2021. All rights reserved.
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* Description: main
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*
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* Create: 2021-03-09
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*/
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.section .text.entry
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.global _start
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.option norvc
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_start:
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j Reset_Handler
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Reset_Handler:
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li t0,0x0
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csrw pmpcfg0,t0
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li t0,0x0
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csrw pmpcfg1,t0
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li t0,0x0
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csrw pmpcfg2,t0
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li t0,0x0
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csrw pmpcfg3,t0
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li t0,0x0
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csrw 0x7d9,t0
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la t0, __flash_boot_flag_begin__
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mv t1, a0
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lw t3, (t1)
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sw t3, (t0)
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la t0, trap_vector
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addi t0, t0, 1
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csrw mtvec, t0
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csrwi mstatus, 0
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csrwi mie, 0
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# initialize global pointer
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la gp, _gp_
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# initialize stack pointer
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la sp, __stack_top__
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/* init stack */
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la t0, g_system_stack_begin
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la t1, g_system_stack_end
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beq t0, t1, end_set_stack_loop
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li t2, 0xefbeadde
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set_stack_loop:
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sw t2, (t0)
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addi t0, t0, 4
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blt t0, t1, set_stack_loop
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end_set_stack_loop:
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/* clear reg */
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li ra, 0
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li tp, 0
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li s0, 0
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li s1, 0
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li a0, 0
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li a1, 0
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li a2, 0
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li a3, 0
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li a4, 0
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li a5, 0
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li a6, 0
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li a7, 0
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li s2, 0
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li s3, 0
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li s4, 0
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li s5, 0
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li s6, 0
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li s7, 0
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li s8, 0
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li s9, 0
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li s10, 0
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li s11, 0
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li t3, 0
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li t4, 0
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li t5, 0
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li t6, 0
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/* clear bss section */
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la t0, __bss_begin__
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la t1, __bss_end__
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beq t0, t1, end_clear_bss_loop
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li t2, 0x00000000
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clear_bss_loop:
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sw t2, (t0)
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addi t0, t0, 4
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blt t0, t1, clear_bss_loop
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end_clear_bss_loop:
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j start_fastboot
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