# startup.s - Baremetal startup code for Milk-V Duo

#/* Baremetal Risc-V USB <=> Amiga Joystick/Mouse HID converter. 
 #* March 2026 - Anders Holck
 #* This software has no license. If you choose to use, please include my name :)
#*/

.section .text.startup
.global _start

_start:
    # 1. Disable interrupts
    csrw mie, zero

    # 2. Set up stack pointer (end of SRAM)
    li sp, 0x0E000000 + 128*1024

    # 3. Clear BSS
    la t0, _bss_start
    la t1, _bss_end

bss_clear_loop:
    bgeu t0, t1, bss_clear_done
    sd zero, 0(t0)
    addi t0, t0, 8
    j bss_clear_loop

bss_clear_done:
    j main

.section .text
# The main function will be in amiga_joystick_mouse.s