; serial terminal - spawn sh.fxf on the serial port

    opton

    ; start an instance of sh.fxf
    call get_current_disk_id
    mov r1, r0
    mov r0, sh_fxf_name
    mov r2, stream_struct
    mov r3, 0
    mov r4, 0
    mov r5, 0
    mov r6, 0
    call launch_fxf_from_disk
    cmp r0, 0xFFFFFFFF
    ifz call end_current_task
    mov.8 [shell_task_id], r0

event_loop:
    movz.8 r0, [shell_task_id]
    call is_task_id_used
    ifz call end_current_task
    call yield_task
    rjmp event_loop

print_str_to_terminal:
    push r0
    push r1
print_str_to_terminal_loop:
    mov r1, [r0]
    cmp r1, 0
    ifz jmp print_str_to_terminal_out
    out 0, r1
    inc r0
    jmp print_str_to_terminal_loop
print_str_to_terminal_out:
    pop r1
    pop r0
    ret

stream_struct:
    data.8  0x00
    data.16 0x00
    data.32 0x00
    data.8  0x01
    data.32 stream_read
    data.32 stream_write

shell_task_id: data.8 0
sh_fxf_name: data.strz "sh.fxf"

stream_read:
    in r0, 0
    ret

stream_write:
    push r0
    movz.8 r0, [r0]
    bts r0, 7
    ifnz jmp stream_write_special
    out 0, r0
    pop r0
    ret
stream_write_special:
    cmp r0, 0x8a
    ifz out 0, ' '
    pop r0
    ret

    #include "../../../fox32rom/fox32rom.def"
    #include "../../fox32os.def"