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