idt.h File Reference

Data structures concerning the Interrupt Descriptor Table (IDT). More...

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Classes
struct	idt_descriptor_t
	This structure describes one interrupt gate. More...
struct	idt_pointer_t
	A pointer structure used for informing the CPU about our IDT. More...

Macros
#define	IDT_SIZE   256
	The maximum dimension of the IDT.
#define	TASK_GATE   0x5
	When an exception occurs whose entry is a Task Gate, a task switch results.
#define	INT16_GATE   0x6
	Used to specify an interrupt service routine (16-bit).
#define	TRAP16_GATE   0x7
	Similar to an Interrupt gate (16-bit).
#define	INT32_GATE   0xE
	Used to specify an interrupt service routine (32-bit).
#define	TRAP32_GATE   0xF
	Similar to an Interrupt gate (32-bit).

Typedefs
typedef struct idt_descriptor_t	_syscall0 = _syscall0( (packed) )= _syscall1( (packed) )= _syscall2( (packed) )= _syscall3( (packed) )= idt_descriptor_t
	This structure describes one interrupt gate. More...

Functions
void	init_idt (void)
	Initialise the interrupt descriptor table.

Detailed Description

Data structures concerning the Interrupt Descriptor Table (IDT).

The IDT is used to show the processor what Interrupt Service Routine (ISR) to call to handle an exception. IDT entries are also called Interrupt requests whenever a device has completed a request and needs to be serviced. ISRs are used to save the current processor state and set up the appropriate segment registers needed for kernel mode before the kernel’s C-level interrupt handler is called. To handle the right exception, the correct entry in the IDT should be pointed to the correct ISR.

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.