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/***************************************************************************
* Copyright (c) 2026 10xEngineers
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
.global _start
.extern main
.extern _sysstack_start
.extern _bss_start
.extern _bss_end
.section .text.entry
.align 4
_start:
/* Zero all general-purpose registers (x1–x31). */
li x1, 0
li x2, 0
li x3, 0
li x4, 0
li x5, 0
li x6, 0
li x7, 0
li x8, 0
li x9, 0
li x10, 0
li x11, 0
li x12, 0
li x13, 0
li x14, 0
li x15, 0
li x16, 0
li x17, 0
li x18, 0
li x19, 0
li x20, 0
li x21, 0
li x22, 0
li x23, 0
li x24, 0
li x25, 0
li x26, 0
li x27, 0
li x28, 0
li x29, 0
li x30, 0
li x31, 0
/* Set up the initial supervisor stack (16 KiB). */
la t0, _sysstack_start
li t1, 0x4000
add sp, t0, t1
/* Zero the .bss section. */
la t0, _bss_start
la t1, _bss_end
_bss_clean_start:
bgeu t0, t1, _bss_clean_end
sb zero, 0(t0)
addi t0, t0, 1
j _bss_clean_start
_bss_clean_end:
call main
/* Halt if main() ever returns. */
_park:
wfi
j _park
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