lib/x86/apic.h

#ifndef CFLAT_APIC_H
#define CFLAT_APIC_H

#include <stdint.h>
#include "apic-defs.h"

extern u8 id_map[MAX_TEST_CPUS];

extern void *g_apic;
extern void *g_ioapic;

typedef struct {
    uint8_t vector;
    uint8_t delivery_mode:3;
    uint8_t dest_mode:1;
    uint8_t delivery_status:1;
    uint8_t polarity:1;
    uint8_t remote_irr:1;
    uint8_t trig_mode:1;
    uint8_t mask:1;
    uint8_t reserve:7;
    uint8_t reserved[4];
    uint8_t dest_id;
} ioapic_redir_entry_t;

typedef enum trigger_mode {
	TRIGGER_EDGE = 0,
	TRIGGER_LEVEL,
	TRIGGER_MAX,
} trigger_mode_t;

void mask_pic_interrupts(void);

void eoi(void);
uint8_t apic_get_tpr(void);
void apic_set_tpr(uint8_t tpr);

void ioapic_write_redir(unsigned line, ioapic_redir_entry_t e);
void ioapic_write_reg(unsigned reg, uint32_t value);
ioapic_redir_entry_t ioapic_read_redir(unsigned line);
uint32_t ioapic_read_reg(unsigned reg);

void ioapic_set_redir(unsigned line, unsigned vec,
		trigger_mode_t trig_mode);

void set_mask(unsigned line, int mask);

void set_irq_line(unsigned line, int val);

void enable_apic(void);
uint32_t apic_read(unsigned reg);
bool apic_read_bit(unsigned reg, int n);
void apic_write(unsigned reg, uint32_t val);
void apic_icr_write(uint32_t val, uint32_t dest);
uint32_t apic_id(void);

int enable_x2apic(void);
void disable_apic(void);
void reset_apic(void);
void init_apic_map(void);

/* Converts byte-addressable APIC register offset to 4-byte offset. */
static inline u32 apic_reg_index(u32 reg)
{
	return reg >> 2;
}

static inline u32 x2apic_msr(u32 reg)
{
	return APIC_BASE_MSR + (reg >> 4);
}

static inline bool apic_lvt_entry_supported(int idx)
{
	return GET_APIC_MAXLVT(apic_read(APIC_LVR)) >= idx;
}

static inline bool x2apic_reg_reserved(u32 reg)
{
	switch (reg) {
	case 0x000 ... 0x010:
	case 0x040 ... 0x070:
	case 0x090:
	case 0x0c0:
	case 0x0e0:
	case 0x290 ... 0x2e0:
	case 0x310:
	case 0x3a0 ... 0x3d0:
	case 0x3f0:
		return true;
	case APIC_CMCI:
		return !apic_lvt_entry_supported(6);
	default:
		return false;
	}
}

#endif