/*
 *  APIC support - internal interfaces
 *
 *  Copyright (c) 2004-2005 Fabrice Bellard
 *  Copyright (c) 2011      Jan Kiszka, Siemens AG
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>
 */

#ifndef QEMU_APIC_INTERNAL_H
#define QEMU_APIC_INTERNAL_H

#include "cpu.h"
#include "exec/memory.h"
#include "qemu/timer.h"
#include "target/i386/cpu-qom.h"
#include "qom/object.h"

/* APIC Local Vector Table */
#define APIC_LVT_TIMER                  0
#define APIC_LVT_THERMAL                1
#define APIC_LVT_PERFORM                2
#define APIC_LVT_LINT0                  3
#define APIC_LVT_LINT1                  4
#define APIC_LVT_ERROR                  5
#define APIC_LVT_NB                     6

/* APIC delivery modes */
#define APIC_DM_FIXED                   0
#define APIC_DM_LOWPRI                  1
#define APIC_DM_SMI                     2
#define APIC_DM_NMI                     4
#define APIC_DM_INIT                    5
#define APIC_DM_SIPI                    6
#define APIC_DM_EXTINT                  7

/* APIC destination mode */
#define APIC_DESTMODE_FLAT              0xf
#define APIC_DESTMODE_CLUSTER           1

#define APIC_TRIGGER_EDGE               0
#define APIC_TRIGGER_LEVEL              1

#define APIC_VECTOR_MASK                0xff
#define APIC_DCR_MASK                   0xf

#define APIC_LVT_TIMER_SHIFT            17
#define APIC_LVT_MASKED_SHIFT           16
#define APIC_LVT_LEVEL_TRIGGER_SHIFT    15
#define APIC_LVT_REMOTE_IRR_SHIFT       14
#define APIC_LVT_INT_POLARITY_SHIFT     13
#define APIC_LVT_DELIV_STS_SHIFT        12
#define APIC_LVT_DELIV_MOD_SHIFT        8

#define APIC_LVT_TIMER_TSCDEADLINE      (2 << APIC_LVT_TIMER_SHIFT)
#define APIC_LVT_TIMER_PERIODIC         (1 << APIC_LVT_TIMER_SHIFT)
#define APIC_LVT_MASKED                 (1 << APIC_LVT_MASKED_SHIFT)
#define APIC_LVT_LEVEL_TRIGGER          (1 << APIC_LVT_LEVEL_TRIGGER_SHIFT)
#define APIC_LVT_REMOTE_IRR             (1 << APIC_LVT_REMOTE_IRR_SHIFT)
#define APIC_LVT_INT_POLARITY           (1 << APIC_LVT_INT_POLARITY_SHIFT)
#define APIC_LVT_DELIV_STS              (1 << APIC_LVT_DELIV_STS_SHIFT)
#define APIC_LVT_DELIV_MOD              (7 << APIC_LVT_DELIV_MOD_SHIFT)

#define APIC_ESR_ILL_ADDRESS_SHIFT      7
#define APIC_ESR_RECV_ILL_VECT_SHIFT    6
#define APIC_ESR_SEND_ILL_VECT_SHIFT    5
#define APIC_ESR_RECV_ACCEPT_SHIFT      3
#define APIC_ESR_SEND_ACCEPT_SHIFT      2
#define APIC_ESR_RECV_CHECK_SUM_SHIFT   1

#define APIC_ESR_ILLEGAL_ADDRESS        (1 << APIC_ESR_ILL_ADDRESS_SHIFT)
#define APIC_ESR_RECV_ILLEGAL_VECT      (1 << APIC_ESR_RECV_ILL_VECT_SHIFT)
#define APIC_ESR_SEND_ILLEGAL_VECT      (1 << APIC_ESR_SEND_ILL_VECT_SHIFT)
#define APIC_ESR_RECV_ACCEPT            (1 << APIC_ESR_RECV_ACCEPT_SHIFT)
#define APIC_ESR_SEND_ACCEPT            (1 << APIC_ESR_SEND_ACCEPT_SHIFT)
#define APIC_ESR_RECV_CHECK_SUM         (1 << APIC_ESR_RECV_CHECK_SUM_SHIFT)
#define APIC_ESR_SEND_CHECK_SUM         1

#define APIC_ICR_DEST_SHIFT             24
#define APIC_ICR_DEST_SHORT_SHIFT       18
#define APIC_ICR_TRIGGER_MOD_SHIFT      15
#define APIC_ICR_LEVEL_SHIFT            14
#define APIC_ICR_DELIV_STS_SHIFT        12
#define APIC_ICR_DEST_MOD_SHIFT         11
#define APIC_ICR_DELIV_MOD_SHIFT        8

#define APIC_ICR_DEST_SHORT             (3 << APIC_ICR_DEST_SHORT_SHIFT)
#define APIC_ICR_TRIGGER_MOD            (1 << APIC_ICR_TRIGGER_MOD_SHIFT)
#define APIC_ICR_LEVEL                  (1 << APIC_ICR_LEVEL_SHIFT)
#define APIC_ICR_DELIV_STS              (1 << APIC_ICR_DELIV_STS_SHIFT)
#define APIC_ICR_DEST_MOD               (1 << APIC_ICR_DEST_MOD_SHIFT)
#define APIC_ICR_DELIV_MOD              (7 << APIC_ICR_DELIV_MOD_SHIFT)

#define APIC_PR_CLASS_SHIFT             4
#define APIC_PR_SUB_CLASS               0xf

#define APIC_LOGDEST_XAPIC_SHIFT        4
#define APIC_LOGDEST_XAPIC_ID           0xf

#define APIC_LOGDEST_X2APIC_SHIFT       16
#define APIC_LOGDEST_X2APIC_ID          0xffff

#define APIC_SPURIO_FOCUS_SHIFT         9
#define APIC_SPURIO_ENABLED_SHIFT       8

#define APIC_SPURIO_FOCUS               (1 << APIC_SPURIO_FOCUS_SHIFT)
#define APIC_SPURIO_ENABLED             (1 << APIC_SPURIO_ENABLED_SHIFT)

#define APIC_SV_DIRECTED_IO             (1 << 12)
#define APIC_SV_ENABLE                  (1 << 8)

#define VAPIC_ENABLE_BIT                0
#define VAPIC_ENABLE_MASK               (1 << VAPIC_ENABLE_BIT)

typedef struct APICCommonState APICCommonState;

#define TYPE_APIC_COMMON "apic-common"
typedef struct APICCommonClass APICCommonClass;
DECLARE_OBJ_CHECKERS(APICCommonState, APICCommonClass,
                     APIC_COMMON, TYPE_APIC_COMMON)

struct APICCommonClass {
    DeviceClass parent_class;

    DeviceRealize realize;
    DeviceUnrealize unrealize;
    void (*set_base)(APICCommonState *s, uint64_t val);
    void (*set_tpr)(APICCommonState *s, uint8_t val);
    uint8_t (*get_tpr)(APICCommonState *s);
    void (*enable_tpr_reporting)(APICCommonState *s, bool enable);
    void (*vapic_base_update)(APICCommonState *s);
    void (*external_nmi)(APICCommonState *s);
    void (*pre_save)(APICCommonState *s);
    void (*post_load)(APICCommonState *s);
    void (*reset)(APICCommonState *s);
    /* send_msi emulates an APIC bus and its proper place would be in a new
     * device, but it's convenient to have it here for now.
     */
    void (*send_msi)(MSIMessage *msi);
};

struct APICCommonState {
    /*< private >*/
    DeviceState parent_obj;
    /*< public >*/

    MemoryRegion io_memory;
    X86CPU *cpu;
    uint32_t apicbase;
    uint8_t id; /* legacy APIC ID */
    uint32_t initial_apic_id;
    uint8_t version;
    uint8_t arb_id;
    uint8_t tpr;
    uint32_t spurious_vec;
    uint8_t log_dest;
    uint8_t dest_mode;
    uint32_t isr[8];  /* in service register */
    uint32_t tmr[8];  /* trigger mode register */
    uint32_t irr[8]; /* interrupt request register */
    uint32_t lvt[APIC_LVT_NB];
    uint32_t esr; /* error register */
    uint32_t icr[2];

    uint32_t divide_conf;
    int count_shift;
    uint32_t initial_count;
    int64_t initial_count_load_time;
    int64_t next_time;
    QEMUTimer *timer;
    int64_t timer_expiry;
    int sipi_vector;
    int wait_for_sipi;

    uint32_t vapic_control;
    DeviceState *vapic;
    hwaddr vapic_paddr; /* note: persistence via kvmvapic */
    bool legacy_instance_id;
};

typedef struct VAPICState {
    uint8_t tpr;
    uint8_t isr;
    uint8_t zero;
    uint8_t irr;
    uint8_t enabled;
} QEMU_PACKED VAPICState;

extern bool apic_report_tpr_access;

bool apic_next_timer(APICCommonState *s, int64_t current_time);
void apic_enable_tpr_access_reporting(DeviceState *d, bool enable);
void apic_enable_vapic(DeviceState *d, hwaddr paddr);

void vapic_report_tpr_access(DeviceState *dev, CPUState *cpu, target_ulong ip,
                             TPRAccess access);

int apic_get_ppr(APICCommonState *s);
uint32_t apic_get_current_count(APICCommonState *s);

static inline void apic_set_bit(uint32_t *tab, int index)
{
    int i, mask;
    i = index >> 5;
    mask = 1 << (index & 0x1f);
    tab[i] |= mask;
}

static inline int apic_get_bit(uint32_t *tab, int index)
{
    int i, mask;
    i = index >> 5;
    mask = 1 << (index & 0x1f);
    return !!(tab[i] & mask);
}

APICCommonClass *apic_get_class(Error **errp);

#endif /* QEMU_APIC_INTERNAL_H */