| // Helpers for working with i8259 interrupt controller. |
| // |
| // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| // Copyright (C) 2002 MandrakeSoft S.A. |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| #ifndef __PIC_H |
| #define __PIC_H |
| |
| #include "ioport.h" // PORT_PIC* |
| #include "biosvar.h" // SET_IVT |
| |
| // PORT_PIC1 bitdefs |
| #define PIC1_IRQ0 (1<<0) |
| #define PIC1_IRQ1 (1<<1) |
| #define PIC1_IRQ2 (1<<2) |
| #define PIC1_IRQ5 (1<<5) |
| #define PIC1_IRQ6 (1<<6) |
| // PORT_PIC2 bitdefs |
| #define PIC2_IRQ8 (1<<0) |
| #define PIC2_IRQ12 (1<<4) |
| #define PIC2_IRQ13 (1<<5) |
| #define PIC2_IRQ14 (1<<6) |
| |
| #define BIOS_HWIRQ0_VECTOR 0x08 |
| #define BIOS_HWIRQ8_VECTOR 0x70 |
| |
| static inline void |
| eoi_pic1(void) |
| { |
| // Send eoi (select OCW2 + eoi) |
| outb(0x20, PORT_PIC1_CMD); |
| } |
| |
| static inline void |
| eoi_pic2(void) |
| { |
| // Send eoi (select OCW2 + eoi) |
| outb(0x20, PORT_PIC2_CMD); |
| eoi_pic1(); |
| } |
| |
| static inline void |
| unmask_pic1(u8 irq) |
| { |
| outb(inb(PORT_PIC1_DATA) & ~irq, PORT_PIC1_DATA); |
| } |
| |
| static inline void |
| unmask_pic2(u8 irq) |
| { |
| outb(inb(PORT_PIC2_DATA) & ~irq, PORT_PIC2_DATA); |
| } |
| |
| static inline void |
| mask_pic1(u8 irq) |
| { |
| outb(inb(PORT_PIC1_DATA) | irq, PORT_PIC1_DATA); |
| } |
| |
| static inline void |
| mask_pic2(u8 irq) |
| { |
| outb(inb(PORT_PIC2_DATA) | irq, PORT_PIC2_DATA); |
| } |
| |
| static inline u8 |
| get_pic1_isr(void) |
| { |
| // 0x0b == select OCW1 + read ISR |
| outb(0x0b, PORT_PIC1_CMD); |
| return inb(PORT_PIC1_CMD); |
| } |
| |
| static inline u8 |
| get_pic2_isr(void) |
| { |
| // 0x0b == select OCW1 + read ISR |
| outb(0x0b, PORT_PIC2_CMD); |
| return inb(PORT_PIC2_CMD); |
| } |
| |
| static inline void |
| enable_hwirq(int hwirq, struct segoff_s func) |
| { |
| int vector; |
| if (hwirq < 8) { |
| unmask_pic1(1 << hwirq); |
| vector = BIOS_HWIRQ0_VECTOR + hwirq; |
| } else { |
| unmask_pic2(1 << (hwirq - 8)); |
| vector = BIOS_HWIRQ8_VECTOR + hwirq - 8; |
| } |
| SET_IVT(vector, func); |
| } |
| |
| void set_pics(u8 irq0, u8 irq8); |
| void pic_setup(void); |
| void pic_save_mask(void); |
| void pic_restore_mask(void); |
| |
| #endif // pic.h |