pic.h

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#pragma once
 
/**
 * @brief Programmable Interrupt Controller (PIC) definitions and functions.
 * @defgroup kernel_drivers_pic PIC
 * @ingroup kernel_drivers
 *
 * The PIC is a legacy interrupt controller used in x86 systems to manage hardware interrupts. It has largely been
 * superseded by the APIC (Advanced Programmable Interrupt Controller) in modern systems, as such we simply disable the
 * PIC during system initialization.
 *
 * @{
 */
 
#define PIC1 0x20
#define PIC2 0xA0
#define PIC1_COMMAND PIC1
#define PIC1_DATA (PIC1 + 1)
#define PIC2_COMMAND PIC2
#define PIC2_DATA (PIC2 + 1)
 
#define PIC_EOI 0x20
 
#define ICW1_ICW4 0x01      ///< Indicates that ICW4 will be present
#define ICW1_SINGLE 0x02    ///< Single (cascade) mode
#define ICW1_INTERVAL4 0x04 ///< Call address interval 4 (8)
#define ICW1_LEVEL 0x08     ///< Level triggered (edge) mode
#define ICW1_INIT 0x10      ///< Initialization - required!
 
#define ICW4_8086 0x01       ///< 8086/88 (MCS-80/85) mode
#define ICW4_AUTO 0x02       ///< Auto (normal) EOI
#define ICW4_BUF_SLAVE 0x08  ///< Buffered mode/slave
#define ICW4_BUF_MASTER 0x0C ///< Buffered mode/master
#define ICW4_SFNM 0x10       ///< Special fully nested (not)
 
void pic_disable(void);
 
/** @} */