Commit 51f233ec authored by Mark Cave-Ayland's avatar Mark Cave-Ayland Committed by David Gibson
Browse files

misc: introduce new mos6522 VIA device and enable it for ppc builds 



The MOS6522 VIA forms the bridge part of several Mac devices, including the
Mac via-cuda and via-pmu devices. Introduce a standard mos6522 device that
can be shared amongst multiple implementations.

This is effectively taking the 6522 parts out of cuda.c and turning them
into a separate device whilst also applying some style tidy-ups and including
a conversion to trace-events.

Signed-off-by: default avatarMark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
parent ce19480e

default-configs/ppc-softmmu.mak

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ CONFIG_MAC=y 
CONFIG_ESCC=y

CONFIG_MACIO=y

CONFIG_SUNGEM=y

CONFIG_MOS6522=y

CONFIG_CUDA=y

CONFIG_ADB=y

CONFIG_MAC_NVRAM=y

hw/misc/Makefile.objs

+3 −0
Original line number Diff line number Diff line
@@ -17,6 +17,9 @@ common-obj-$(CONFIG_INTEGRATOR_DEBUG) += arm_integrator_debug.o 
common-obj-$(CONFIG_A9SCU) += a9scu.o

common-obj-$(CONFIG_ARM11SCU) += arm11scu.o



# Mac devices

common-obj-$(CONFIG_MOS6522) += mos6522.o



# PKUnity SoC devices

common-obj-$(CONFIG_PUV3) += puv3_pm.o

hw/misc/mos6522.c

0 → 100644
+505 −0
Original line number Diff line number Diff line 
/*

 * QEMU MOS6522 VIA emulation

 *

 * Copyright (c) 2004-2007 Fabrice Bellard

 * Copyright (c) 2007 Jocelyn Mayer

 * Copyright (c) 2018 Mark Cave-Ayland

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "qemu/osdep.h"

#include "hw/hw.h"

#include "hw/input/adb.h"

#include "hw/misc/mos6522.h"

#include "qemu/timer.h"

#include "sysemu/sysemu.h"

#include "qemu/cutils.h"

#include "qemu/log.h"

#include "trace.h"



/* XXX: implement all timer modes */



static void mos6522_timer_update(MOS6522State *s, MOS6522Timer *ti,

                                 int64_t current_time);



static void mos6522_update_irq(MOS6522State *s)

{

    if (s->ifr & s->ier & (SR_INT | T1_INT | T2_INT)) {

        qemu_irq_raise(s->irq);

    } else {

        qemu_irq_lower(s->irq);

    }

}



static uint64_t get_counter_value(MOS6522State *s, MOS6522Timer *ti)

{

    MOS6522DeviceClass *mdc = MOS6522_DEVICE_GET_CLASS(s);



    if (ti->index == 0) {

        return mdc->get_timer1_counter_value(s, ti);

    } else {

        return mdc->get_timer2_counter_value(s, ti);

    }

}



static uint64_t get_load_time(MOS6522State *s, MOS6522Timer *ti)

{

    MOS6522DeviceClass *mdc = MOS6522_DEVICE_GET_CLASS(s);



    if (ti->index == 0) {

        return mdc->get_timer1_load_time(s, ti);

    } else {

        return mdc->get_timer2_load_time(s, ti);

    }

}



static unsigned int get_counter(MOS6522State *s, MOS6522Timer *ti)

{

    int64_t d;

    unsigned int counter;



    d = get_counter_value(s, ti);



    if (ti->index == 0) {

        /* the timer goes down from latch to -1 (period of latch + 2) */

        if (d <= (ti->counter_value + 1)) {

            counter = (ti->counter_value - d) & 0xffff;

        } else {

            counter = (d - (ti->counter_value + 1)) % (ti->latch + 2);

            counter = (ti->latch - counter) & 0xffff;

        }

    } else {

        counter = (ti->counter_value - d) & 0xffff;

    }

    return counter;

}



static void set_counter(MOS6522State *s, MOS6522Timer *ti, unsigned int val)

{

    trace_mos6522_set_counter(1 + ti->index, val);

    ti->load_time = get_load_time(s, ti);

    ti->counter_value = val;

    mos6522_timer_update(s, ti, ti->load_time);

}



static int64_t get_next_irq_time(MOS6522State *s, MOS6522Timer *ti,

                                 int64_t current_time)

{

    int64_t d, next_time;

    unsigned int counter;



    /* current counter value */

    d = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - ti->load_time,

                 ti->frequency, NANOSECONDS_PER_SECOND);



    /* the timer goes down from latch to -1 (period of latch + 2) */

    if (d <= (ti->counter_value + 1)) {

        counter = (ti->counter_value - d) & 0xffff;

    } else {

        counter = (d - (ti->counter_value + 1)) % (ti->latch + 2);

        counter = (ti->latch - counter) & 0xffff;

    }



    /* Note: we consider the irq is raised on 0 */

    if (counter == 0xffff) {

        next_time = d + ti->latch + 1;

    } else if (counter == 0) {

        next_time = d + ti->latch + 2;

    } else {

        next_time = d + counter;

    }

    trace_mos6522_get_next_irq_time(ti->latch, d, next_time - d);

    next_time = muldiv64(next_time, NANOSECONDS_PER_SECOND, ti->frequency) +

                         ti->load_time;

    if (next_time <= current_time) {

        next_time = current_time + 1;

    }

    return next_time;

}



static void mos6522_timer_update(MOS6522State *s, MOS6522Timer *ti,

                                 int64_t current_time)

{

    if (!ti->timer) {

        return;

    }

    if (ti->index == 0 && (s->acr & T1MODE) != T1MODE_CONT) {

        timer_del(ti->timer);

    } else {

        ti->next_irq_time = get_next_irq_time(s, ti, current_time);

        timer_mod(ti->timer, ti->next_irq_time);

    }

}



static void mos6522_timer1(void *opaque)

{

    MOS6522State *s = opaque;

    MOS6522Timer *ti = &s->timers[0];



    mos6522_timer_update(s, ti, ti->next_irq_time);

    s->ifr |= T1_INT;

    mos6522_update_irq(s);

}



static void mos6522_timer2(void *opaque)

{

    MOS6522State *s = opaque;

    MOS6522Timer *ti = &s->timers[1];



    mos6522_timer_update(s, ti, ti->next_irq_time);

    s->ifr |= T2_INT;

    mos6522_update_irq(s);

}



static void mos6522_set_sr_int(MOS6522State *s)

{

    trace_mos6522_set_sr_int();

    s->ifr |= SR_INT;

    mos6522_update_irq(s);

}



static uint64_t mos6522_get_counter_value(MOS6522State *s, MOS6522Timer *ti)

{

    uint64_t d;



    d = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - ti->load_time,

                 ti->frequency, NANOSECONDS_PER_SECOND);



    return d;

}



static uint64_t mos6522_get_load_time(MOS6522State *s, MOS6522Timer *ti)

{

    uint64_t load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);



    return load_time;

}



static void mos6522_portA_write(MOS6522State *s)

{

    qemu_log_mask(LOG_UNIMP, "portA_write unimplemented");

}



static void mos6522_portB_write(MOS6522State *s)

{

    qemu_log_mask(LOG_UNIMP, "portB_write unimplemented");

}



uint64_t mos6522_read(void *opaque, hwaddr addr, unsigned size)

{

    MOS6522State *s = opaque;

    uint32_t val;



    switch (addr) {

    case VIA_REG_B:

        val = s->b;

        break;

    case VIA_REG_A:

        val = s->a;

        break;

    case VIA_REG_DIRB:

        val = s->dirb;

        break;

    case VIA_REG_DIRA:

        val = s->dira;

        break;

    case VIA_REG_T1CL:

        val = get_counter(s, &s->timers[0]) & 0xff;

        s->ifr &= ~T1_INT;

        mos6522_update_irq(s);

        break;

    case VIA_REG_T1CH:

        val = get_counter(s, &s->timers[0]) >> 8;

        mos6522_update_irq(s);

        break;

    case VIA_REG_T1LL:

        val = s->timers[0].latch & 0xff;

        break;

    case VIA_REG_T1LH:

        /* XXX: check this */

        val = (s->timers[0].latch >> 8) & 0xff;

        break;

    case VIA_REG_T2CL:

        val = get_counter(s, &s->timers[1]) & 0xff;

        s->ifr &= ~T2_INT;

        mos6522_update_irq(s);

        break;

    case VIA_REG_T2CH:

        val = get_counter(s, &s->timers[1]) >> 8;

        break;

    case VIA_REG_SR:

        val = s->sr;

        s->ifr &= ~(SR_INT | CB1_INT | CB2_INT);

        mos6522_update_irq(s);

        break;

    case VIA_REG_ACR:

        val = s->acr;

        break;

    case VIA_REG_PCR:

        val = s->pcr;

        break;

    case VIA_REG_IFR:

        val = s->ifr;

        if (s->ifr & s->ier) {

            val |= 0x80;

        }

        break;

    case VIA_REG_IER:

        val = s->ier | 0x80;

        break;

    default:

    case VIA_REG_ANH:

        val = s->anh;

        break;

    }



    if (addr != VIA_REG_IFR || val != 0) {

        trace_mos6522_read(addr, val);

    }



    return val;

}



void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)

{

    MOS6522State *s = opaque;

    MOS6522DeviceClass *mdc = MOS6522_DEVICE_GET_CLASS(s);



    trace_mos6522_write(addr, val);



    switch (addr) {

    case VIA_REG_B:

        s->b = (s->b & ~s->dirb) | (val & s->dirb);

        mdc->portB_write(s);

        break;

    case VIA_REG_A:

        s->a = (s->a & ~s->dira) | (val & s->dira);

        mdc->portA_write(s);

        break;

    case VIA_REG_DIRB:

        s->dirb = val;

        break;

    case VIA_REG_DIRA:

        s->dira = val;

        break;

    case VIA_REG_T1CL:

        s->timers[0].latch = (s->timers[0].latch & 0xff00) | val;

        mos6522_timer_update(s, &s->timers[0],

                             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));

        break;

    case VIA_REG_T1CH:

        s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8);

        s->ifr &= ~T1_INT;

        set_counter(s, &s->timers[0], s->timers[0].latch);

        break;

    case VIA_REG_T1LL:

        s->timers[0].latch = (s->timers[0].latch & 0xff00) | val;

        mos6522_timer_update(s, &s->timers[0],

                             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));

        break;

    case VIA_REG_T1LH:

        s->timers[0].latch = (s->timers[0].latch & 0xff) | (val << 8);

        s->ifr &= ~T1_INT;

        mos6522_timer_update(s, &s->timers[0],

                             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));

        break;

    case VIA_REG_T2CL:

        s->timers[1].latch = (s->timers[1].latch & 0xff00) | val;

        break;

    case VIA_REG_T2CH:

        /* To ensure T2 generates an interrupt on zero crossing with the

           common timer code, write the value directly from the latch to

           the counter */

        s->timers[1].latch = (s->timers[1].latch & 0xff) | (val << 8);

        s->ifr &= ~T2_INT;

        set_counter(s, &s->timers[1], s->timers[1].latch);

        break;

    case VIA_REG_SR:

        s->sr = val;

        break;

    case VIA_REG_ACR:

        s->acr = val;

        mos6522_timer_update(s, &s->timers[0],

                             qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));

        break;

    case VIA_REG_PCR:

        s->pcr = val;

        break;

    case VIA_REG_IFR:

        /* reset bits */

        s->ifr &= ~val;

        mos6522_update_irq(s);

        break;

    case VIA_REG_IER:

        if (val & IER_SET) {

            /* set bits */

            s->ier |= val & 0x7f;

        } else {

            /* reset bits */

            s->ier &= ~val;

        }

        mos6522_update_irq(s);

        break;

    default:

    case VIA_REG_ANH:

        s->anh = val;

        break;

    }

}



static const MemoryRegionOps mos6522_ops = {

    .read = mos6522_read,

    .write = mos6522_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 1,

        .max_access_size = 1,

    },

};



static bool mos6522_timer_exist(void *opaque, int version_id)

{

    MOS6522Timer *s = opaque;



    return s->timer != NULL;

}



static const VMStateDescription vmstate_mos6522_timer = {

    .name = "mos6522_timer",

    .version_id = 0,

    .minimum_version_id = 0,

    .fields = (VMStateField[]) {

        VMSTATE_UINT16(latch, MOS6522Timer),

        VMSTATE_UINT16(counter_value, MOS6522Timer),

        VMSTATE_INT64(load_time, MOS6522Timer),

        VMSTATE_INT64(next_irq_time, MOS6522Timer),

        VMSTATE_TIMER_PTR_TEST(timer, MOS6522Timer, mos6522_timer_exist),

        VMSTATE_END_OF_LIST()

    }

};



static const VMStateDescription vmstate_mos6522 = {

    .name = "mos6522",

    .version_id = 0,

    .minimum_version_id = 0,

    .fields = (VMStateField[]) {

        VMSTATE_UINT8(a, MOS6522State),

        VMSTATE_UINT8(b, MOS6522State),

        VMSTATE_UINT8(dira, MOS6522State),

        VMSTATE_UINT8(dirb, MOS6522State),

        VMSTATE_UINT8(sr, MOS6522State),

        VMSTATE_UINT8(acr, MOS6522State),

        VMSTATE_UINT8(pcr, MOS6522State),

        VMSTATE_UINT8(ifr, MOS6522State),

        VMSTATE_UINT8(ier, MOS6522State),

        VMSTATE_UINT8(anh, MOS6522State),

        VMSTATE_STRUCT_ARRAY(timers, MOS6522State, 2, 1,

                             vmstate_mos6522_timer, MOS6522Timer),

        VMSTATE_END_OF_LIST()

    }

};



static void mos6522_reset(DeviceState *dev)

{

    MOS6522State *s = MOS6522(dev);



    s->b = 0;

    s->a = 0;

    s->dirb = 0xff;

    s->dira = 0;

    s->sr = 0;

    s->acr = 0;

    s->pcr = 0;

    s->ifr = 0;

    s->ier = 0;

    /* s->ier = T1_INT | SR_INT; */

    s->anh = 0;



    s->timers[0].latch = 0xffff;

    set_counter(s, &s->timers[0], 0xffff);



    s->timers[1].latch = 0xffff;

}



static void mos6522_realize(DeviceState *dev, Error **errp)

{

    MOS6522State *s = MOS6522(dev);



    s->timers[0].frequency = s->frequency;

    s->timers[1].frequency = s->frequency;

}



static void mos6522_init(Object *obj)

{

    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);

    MOS6522State *s = MOS6522(obj);

    int i;



    memory_region_init_io(&s->mem, obj, &mos6522_ops, s, "mos6522", 0x10);

    sysbus_init_mmio(sbd, &s->mem);

    sysbus_init_irq(sbd, &s->irq);



    for (i = 0; i < ARRAY_SIZE(s->timers); i++) {

        s->timers[i].index = i;

    }



    s->timers[0].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, mos6522_timer1, s);

    s->timers[1].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, mos6522_timer2, s);

}



static Property mos6522_properties[] = {

    DEFINE_PROP_UINT64("frequency", MOS6522State, frequency, 0),

    DEFINE_PROP_END_OF_LIST()

};



static void mos6522_class_init(ObjectClass *oc, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(oc);

    MOS6522DeviceClass *mdc = MOS6522_DEVICE_CLASS(oc);



    dc->realize = mos6522_realize;

    dc->reset = mos6522_reset;

    dc->vmsd = &vmstate_mos6522;

    dc->props = mos6522_properties;

    mdc->parent_realize = dc->realize;

    mdc->set_sr_int = mos6522_set_sr_int;

    mdc->portB_write = mos6522_portB_write;

    mdc->portA_write = mos6522_portA_write;

    mdc->get_timer1_counter_value = mos6522_get_counter_value;

    mdc->get_timer2_counter_value = mos6522_get_counter_value;

    mdc->get_timer1_load_time = mos6522_get_load_time;

    mdc->get_timer2_load_time = mos6522_get_load_time;

}



static const TypeInfo mos6522_type_info = {

    .name = TYPE_MOS6522,

    .parent = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(MOS6522State),

    .instance_init = mos6522_init,

    .abstract = true,

    .class_size = sizeof(MOS6522DeviceClass),

    .class_init = mos6522_class_init,

};



static void mos6522_register_types(void)

{

    type_register_static(&mos6522_type_info);

}



type_init(mos6522_register_types)

hw/misc/trace-events

+7 −0
Original line number Diff line number Diff line
@@ -70,3 +70,10 @@ msf2_sysreg_write_pll_status(void) "Invalid write to read only PLL status regist 
#hw/misc/imx7_gpr.c

imx7_gpr_read(uint64_t offset) "addr 0x%08" HWADDR_PRIx

imx7_gpr_write(uint64_t offset, uint64_t value) "addr 0x%08" HWADDR_PRIx "value 0x%08" HWADDR_PRIx



# hw/misc/mos6522.c

mos6522_set_counter(int index, unsigned int val) "T%d.counter=%d"

mos6522_get_next_irq_time(uint16_t latch, int64_t d, int64_t delta) "latch=%d counter=0x%"PRId64 " delta_next=0x%"PRId64

mos6522_set_sr_int(void) "set sr_int"

mos6522_write(uint64_t addr, uint64_t val) "reg=0x%"PRIx64 " val=0x%"PRIx64

mos6522_read(uint64_t addr, unsigned val) "reg=0x%"PRIx64 " val=0x%x"

include/hw/misc/mos6522.h

0 → 100644
+152 −0
Original line number Diff line number Diff line 
/*

 * QEMU MOS6522 VIA emulation

 *

 * Copyright (c) 2004-2007 Fabrice Bellard

 * Copyright (c) 2007 Jocelyn Mayer

 * Copyright (c) 2018 Mark Cave-Ayland

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */



#ifndef MOS6522_H

#define MOS6522_H



#include "exec/memory.h"

#include "hw/sysbus.h"

#include "hw/ide/internal.h"

#include "hw/input/adb.h"



/* Bits in ACR */

#define SR_CTRL            0x1c    /* Shift register control bits */

#define SR_EXT             0x0c    /* Shift on external clock */

#define SR_OUT             0x10    /* Shift out if 1 */



/* Bits in IFR and IER */

#define IER_SET            0x80    /* set bits in IER */

#define IER_CLR            0       /* clear bits in IER */



#define CA2_INT            0x01

#define CA1_INT            0x02

#define SR_INT             0x04    /* Shift register full/empty */

#define CB2_INT            0x08

#define CB1_INT            0x10

#define T2_INT             0x20    /* Timer 2 interrupt */

#define T1_INT             0x40    /* Timer 1 interrupt */



/* Bits in ACR */

#define T1MODE             0xc0    /* Timer 1 mode */

#define T1MODE_CONT        0x40    /*  continuous interrupts */



/* VIA registers */

#define VIA_REG_B       0x00

#define VIA_REG_A       0x01

#define VIA_REG_DIRB    0x02

#define VIA_REG_DIRA    0x03

#define VIA_REG_T1CL    0x04

#define VIA_REG_T1CH    0x05

#define VIA_REG_T1LL    0x06

#define VIA_REG_T1LH    0x07

#define VIA_REG_T2CL    0x08

#define VIA_REG_T2CH    0x09

#define VIA_REG_SR      0x0a

#define VIA_REG_ACR     0x0b

#define VIA_REG_PCR     0x0c

#define VIA_REG_IFR     0x0d

#define VIA_REG_IER     0x0e

#define VIA_REG_ANH     0x0f



/**

 * MOS6522Timer:

 * @counter_value: counter value at load time

 */

typedef struct MOS6522Timer {

    int index;

    uint16_t latch;

    uint16_t counter_value;

    int64_t load_time;

    int64_t next_irq_time;

    uint64_t frequency;

    QEMUTimer *timer;

} MOS6522Timer;



/**

 * MOS6522State:

 * @b: B-side data

 * @a: A-side data

 * @dirb: B-side direction (1=output)

 * @dira: A-side direction (1=output)

 * @sr: Shift register

 * @acr: Auxiliary control register

 * @pcr: Peripheral control register

 * @ifr: Interrupt flag register

 * @ier: Interrupt enable register

 * @anh: A-side data, no handshake

 * @last_b: last value of B register

 * @last_acr: last value of ACR register

 */

typedef struct MOS6522State {

    /*< private >*/

    SysBusDevice parent_obj;

    /*< public >*/



    MemoryRegion mem;

    /* VIA registers */

    uint8_t b;

    uint8_t a;

    uint8_t dirb;

    uint8_t dira;

    uint8_t sr;

    uint8_t acr;

    uint8_t pcr;

    uint8_t ifr;

    uint8_t ier;

    uint8_t anh;



    MOS6522Timer timers[2];

    uint64_t frequency;



    qemu_irq irq;

} MOS6522State;



#define TYPE_MOS6522 "mos6522"

#define MOS6522(obj) OBJECT_CHECK(MOS6522State, (obj), TYPE_MOS6522)



typedef struct MOS6522DeviceClass {

    DeviceClass parent_class;



    DeviceRealize parent_realize;

    void (*set_sr_int)(MOS6522State *dev);

    void (*portB_write)(MOS6522State *dev);

    void (*portA_write)(MOS6522State *dev);

    /* These are used to influence the CUDA MacOS timebase calibration */

    uint64_t (*get_timer1_counter_value)(MOS6522State *dev, MOS6522Timer *ti);

    uint64_t (*get_timer2_counter_value)(MOS6522State *dev, MOS6522Timer *ti);

    uint64_t (*get_timer1_load_time)(MOS6522State *dev, MOS6522Timer *ti);

    uint64_t (*get_timer2_load_time)(MOS6522State *dev, MOS6522Timer *ti);

} MOS6522DeviceClass;



#define MOS6522_DEVICE_CLASS(cls) \

    OBJECT_CLASS_CHECK(MOS6522DeviceClass, (cls), TYPE_MOS6522)

#define MOS6522_DEVICE_GET_CLASS(obj) \

    OBJECT_GET_CLASS(MOS6522DeviceClass, (obj), TYPE_MOS6522)



uint64_t mos6522_read(void *opaque, hwaddr addr, unsigned size);

void mos6522_write(void *opaque, hwaddr addr, uint64_t val, unsigned size);



#endif /* MOS6522_H */