fox32os/kernel/shell/commands/disk.asm

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; disk command
shell_disk_command_string: data.str "disk" data.8 0
shell_disk_command:
call shell_parse_arguments
mov r1, 10
call string_to_int
; r0: disk ID
; check if it's in range
cmp r0, 3
ifgt jmp shell_disk_command_out_of_range
; OR it with the IO port to get the current insert state of a disk
; if no disk is inserted then prompt the user to insert a disk
or r0, 0x80001000
in r1, r0
cmp r1, 0
ifz jmp shell_disk_command_insert_disk
; set the current disk ID
mov.8 [shell_current_disk], r0
ret
shell_disk_command_out_of_range:
mov r0, shell_disk_command_out_of_range_string
call print_str_to_terminal
ret
shell_disk_command_insert_disk:
out r0, 0
ret
shell_disk_command_out_of_range_string: data.str "invalid disk ID" data.8 10 data.8 0