IDT simulator

This is a simple IDT Linux-based simulator.

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What is IDT?

In x86 architeture-based systems, the Interrupt Descriptor Table is a table that the processor verifies if an external event occurs.

E.G.:

• Exceptions
• Hardware interruptions
• Software interruptions

You can learn more by reading this article.

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Core functionalities

• Non-block terminal (do not expects for return key to register command)
• Maps its own signals table
• Support to a mini shell with custome commands, easily defined
• Many keys can be associate to a single command
• Logs support

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Non-block input

This project uses the Termios struct to represents terminal settings:

struct termios {
   tcflag_t c_iflag;  // input flags
   tcflag_t c_oflag;  // output flags
   tcflag_t c_cflag;  // control flags
   tcflag_t c_lflag;  // local flags
   cc_t c_cc[NCCS];   // control characters
   // ...
}

It creates two variables of this type:

• old_tio: to store the old terminal input/output settings to be restore later
• new_tio: old_tio with modifications

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Main user functions

User functions are defined in here:

static void init_idt_table(void) {
    strcpy(idt[0].name, "listc\0");
    strcpy(idt[0].description, "Lists all available commands");
    idt[0].keymaps[0] = 0x0C;  // ^L
    idt[0].f = list_commands;

    // more
}

idt is an array of structs, which defines some useful members:

typedef struct {
    char name[15]; // command name
    char description[50]; // command description
    char keymaps[3]; // keymaps to trigger the command
    void (*f)(void); // pointer to function that will be triggered
} IDT;

IDT idt[10]; // initialize an array of structs with 10 spaces (can be increased)

You can use any of this commands in command line mode (:) by typing their names or enter their keys in normal mode

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Dependencies

• GCC

• GDB

• Make

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How to run it?

Build:

make all

Run:

make run

Debug:

make debug

Clean:

make clean

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Made with ❤️ using and