apic.c

xen虚拟机源代码安装包

    }
}

static void apic_timer(void *opaque)
{
    APICState *s = opaque;

    if (!(s->lvt[APIC_LVT_TIMER] & APIC_LVT_MASKED)) {
        apic_set_irq(s, s->lvt[APIC_LVT_TIMER] & 0xff, APIC_TRIGGER_EDGE);
    }
    apic_timer_update(s, s->next_time);
}

static uint32_t apic_mem_readb(void *opaque, target_phys_addr_t addr)
{
    return 0;
}

static uint32_t apic_mem_readw(void *opaque, target_phys_addr_t addr)
{
    return 0;
}

static void apic_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
{
}

static void apic_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
{
}

static uint32_t apic_mem_readl(void *opaque, target_phys_addr_t addr)
{
    CPUState *env;
    APICState *s;
    uint32_t val;
    int index;

    env = cpu_single_env;
    if (!env)
        return 0;
    s = env->apic_state;

    index = (addr >> 4) & 0xff;
    switch(index) {
    case 0x02: /* id */
        val = s->id << 24;
        break;
    case 0x03: /* version */
        val = 0x11 | ((APIC_LVT_NB - 1) << 16); /* version 0x11 */
        break;
    case 0x08:
        val = s->tpr;
        break;
    case 0x09:
        val = apic_get_arb_pri(s);
        break;
    case 0x0a:
        /* ppr */
        val = apic_get_ppr(s);
        break;
    case 0x0d:
        val = s->log_dest << 24;
        break;
    case 0x0e:
        val = s->dest_mode << 28;
        break;
    case 0x0f:
        val = s->spurious_vec;
        break;
    case 0x10 ... 0x17:
        val = s->isr[index & 7];
        break;
    case 0x18 ... 0x1f:
        val = s->tmr[index & 7];
        break;
    case 0x20 ... 0x27:
        val = s->irr[index & 7];
        break;
    case 0x28:
        val = s->esr;
        break;
    case 0x30:
    case 0x31:
        val = s->icr[index & 1];
        break;
    case 0x32 ... 0x37:
        val = s->lvt[index - 0x32];
        break;
    case 0x38:
        val = s->initial_count;
        break;
    case 0x39:
        val = apic_get_current_count(s);
        break;
    case 0x3e:
        val = s->divide_conf;
        break;
    default:
        s->esr |= ESR_ILLEGAL_ADDRESS;
        val = 0;
        break;
    }
#ifdef DEBUG_APIC
    printf("APIC read: %08x = %08x\n", (uint32_t)addr, val);
#endif
    return val;
}

static void apic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
    CPUState *env;
    APICState *s;
    int index;

    env = cpu_single_env;
    if (!env)
        return;
    s = env->apic_state;

#ifdef DEBUG_APIC
    printf("APIC write: %08x = %08x\n", (uint32_t)addr, val);
#endif

    index = (addr >> 4) & 0xff;
    switch(index) {
    case 0x02:
        s->id = (val >> 24);
        break;
    case 0x03:
        break;
    case 0x08:
        s->tpr = val;
        apic_update_irq(s);
        break;
    case 0x09:
    case 0x0a:
        break;
    case 0x0b: /* EOI */
        apic_eoi(s);
        break;
    case 0x0d:
        s->log_dest = val >> 24;
        break;
    case 0x0e:
        s->dest_mode = val >> 28;
        break;
    case 0x0f:
        s->spurious_vec = val & 0x1ff;
        apic_update_irq(s);
        break;
    case 0x10 ... 0x17:
    case 0x18 ... 0x1f:
    case 0x20 ... 0x27:
    case 0x28:
        break;
    case 0x30:
        s->icr[0] = val;
        apic_deliver(s, (s->icr[1] >> 24) & 0xff, (s->icr[0] >> 11) & 1,
                     (s->icr[0] >> 8) & 7, (s->icr[0] & 0xff),
                     (s->icr[0] >> 14) & 1, (s->icr[0] >> 15) & 1);
        break;
    case 0x31:
        s->icr[1] = val;
        break;
    case 0x32 ... 0x37:
        {
            int n = index - 0x32;
            s->lvt[n] = val;
            if (n == APIC_LVT_TIMER)
                apic_timer_update(s, qemu_get_clock(vm_clock));
        }
        break;
    case 0x38:
        s->initial_count = val;
        s->initial_count_load_time = qemu_get_clock(vm_clock);
        apic_timer_update(s, s->initial_count_load_time);
        break;
    case 0x39:
        break;
    case 0x3e:
        {
            int v;
            s->divide_conf = val & 0xb;
            v = (s->divide_conf & 3) | ((s->divide_conf >> 1) & 4);
            s->count_shift = (v + 1) & 7;
        }
        break;
    default:
        s->esr |= ESR_ILLEGAL_ADDRESS;
        break;
    }
}

static void apic_save(QEMUFile *f, void *opaque)
{
    APICState *s = opaque;
    int i;

    qemu_put_be32s(f, &s->apicbase);
    qemu_put_8s(f, &s->id);
    qemu_put_8s(f, &s->arb_id);
    qemu_put_8s(f, &s->tpr);
    qemu_put_be32s(f, &s->spurious_vec);
    qemu_put_8s(f, &s->log_dest);
    qemu_put_8s(f, &s->dest_mode);
    for (i = 0; i < 8; i++) {
        qemu_put_be32s(f, &s->isr[i]);
        qemu_put_be32s(f, &s->tmr[i]);
        qemu_put_be32s(f, &s->irr[i]);
    }
    for (i = 0; i < APIC_LVT_NB; i++) {
        qemu_put_be32s(f, &s->lvt[i]);
    }
    qemu_put_be32s(f, &s->esr);
    qemu_put_be32s(f, &s->icr[0]);
    qemu_put_be32s(f, &s->icr[1]);
    qemu_put_be32s(f, &s->divide_conf);
    qemu_put_be32s(f, &s->count_shift);
    qemu_put_be32s(f, &s->initial_count);
    qemu_put_be64s(f, &s->initial_count_load_time);
    qemu_put_be64s(f, &s->next_time);

    qemu_put_timer(f, s->timer);
}

static int apic_load(QEMUFile *f, void *opaque, int version_id)
{
    APICState *s = opaque;
    int i;

    if (version_id > 2)
        return -EINVAL;

    /* XXX: what if the base changes? (registered memory regions) */
    qemu_get_be32s(f, &s->apicbase);
    qemu_get_8s(f, &s->id);
    qemu_get_8s(f, &s->arb_id);
    qemu_get_8s(f, &s->tpr);
    qemu_get_be32s(f, &s->spurious_vec);
    qemu_get_8s(f, &s->log_dest);
    qemu_get_8s(f, &s->dest_mode);
    for (i = 0; i < 8; i++) {
        qemu_get_be32s(f, &s->isr[i]);
        qemu_get_be32s(f, &s->tmr[i]);
        qemu_get_be32s(f, &s->irr[i]);
    }
    for (i = 0; i < APIC_LVT_NB; i++) {
        qemu_get_be32s(f, &s->lvt[i]);
    }
    qemu_get_be32s(f, &s->esr);
    qemu_get_be32s(f, &s->icr[0]);
    qemu_get_be32s(f, &s->icr[1]);
    qemu_get_be32s(f, &s->divide_conf);
    qemu_get_be32s(f, &s->count_shift);
    qemu_get_be32s(f, &s->initial_count);
    qemu_get_be64s(f, &s->initial_count_load_time);
    qemu_get_be64s(f, &s->next_time);

    if (version_id >= 2)
        qemu_get_timer(f, s->timer);
    return 0;
}

static void apic_reset(void *opaque)
{
    APICState *s = opaque;
    apic_init_ipi(s);
}

static CPUReadMemoryFunc *apic_mem_read[3] = {
    apic_mem_readb,
    apic_mem_readw,
    apic_mem_readl,
};

static CPUWriteMemoryFunc *apic_mem_write[3] = {
    apic_mem_writeb,
    apic_mem_writew,
    apic_mem_writel,
};

int apic_init(CPUState *env)
{
    APICState *s;

    if (last_apic_id >= MAX_APICS)
        return -1;
    s = qemu_mallocz(sizeof(APICState));
    if (!s)
        return -1;
    env->apic_state = s;
    apic_init_ipi(s);
    s->id = last_apic_id++;
    s->cpu_env = env;
    s->apicbase = 0xfee00000 | 
        (s->id ? 0 : MSR_IA32_APICBASE_BSP) | MSR_IA32_APICBASE_ENABLE;

    /* XXX: mapping more APICs at the same memory location */
    if (apic_io_memory == 0) {
        /* NOTE: the APIC is directly connected to the CPU - it is not
           on the global memory bus. */
        apic_io_memory = cpu_register_io_memory(0, apic_mem_read, 
                                                apic_mem_write, NULL);
        cpu_register_physical_memory(s->apicbase & ~0xfff, 0x1000,
                                     apic_io_memory);
    }
    s->timer = qemu_new_timer(vm_clock, apic_timer, s);

    register_savevm("apic", 0, 2, apic_save, apic_load, s);
    qemu_register_reset(apic_reset, s);
    
    local_apics[s->id] = s;
    return 0;
}

static void ioapic_service(IOAPICState *s)
{
    uint8_t i;
    uint8_t trig_mode;
    uint8_t vector;
    uint8_t delivery_mode;
    uint32_t mask;
    uint64_t entry;
    uint8_t dest;
    uint8_t dest_mode;
    uint8_t polarity;
    uint32_t deliver_bitmask[MAX_APIC_WORDS];

    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
        mask = 1 << i;
        if (s->irr & mask) {
            entry = s->ioredtbl[i];
            if (!(entry & APIC_LVT_MASKED)) {
                trig_mode = ((entry >> 15) & 1);
                dest = entry >> 56;
                dest_mode = (entry >> 11) & 1;
                delivery_mode = (entry >> 8) & 7;
                polarity = (entry >> 13) & 1;
                if (trig_mode == APIC_TRIGGER_EDGE)
                    s->irr &= ~mask;
                if (delivery_mode == APIC_DM_EXTINT)
                    vector = pic_read_irq(isa_pic);
                else
                    vector = entry & 0xff;
                
                apic_get_delivery_bitmask(deliver_bitmask, dest, dest_mode);
                apic_bus_deliver(deliver_bitmask, delivery_mode, 
                                 vector, polarity, trig_mode);
            }
        }
    }
}

void ioapic_set_irq(void *opaque, int vector, int level)
{
    IOAPICState *s = opaque;

    if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
        uint32_t mask = 1 << vector;
        uint64_t entry = s->ioredtbl[vector];

        if ((entry >> 15) & 1) {
            /* level triggered */
            if (level) {
                s->irr |= mask;
                ioapic_service(s);
            } else {
                s->irr &= ~mask;
            }
        } else {
            /* edge triggered */
            if (level) {
                s->irr |= mask;
                ioapic_service(s);
            }
        }
    }
}

static uint32_t ioapic_mem_readl(void *opaque, target_phys_addr_t addr)
{
    IOAPICState *s = opaque;
    int index;
    uint32_t val = 0;

    addr &= 0xff;
    if (addr == 0x00) {
        val = s->ioregsel;
    } else if (addr == 0x10) {
        switch (s->ioregsel) {
            case 0x00:
                val = s->id << 24;
                break;
            case 0x01:
                val = 0x11 | ((IOAPIC_NUM_PINS - 1) << 16); /* version 0x11 */
                break;
            case 0x02:
                val = 0;
                break;
            default:
                index = (s->ioregsel - 0x10) >> 1;
                if (index >= 0 && index < IOAPIC_NUM_PINS) {
                    if (s->ioregsel & 1)
                        val = s->ioredtbl[index] >> 32;
                    else
                        val = s->ioredtbl[index] & 0xffffffff;
                }
        }
#ifdef DEBUG_IOAPIC
        printf("I/O APIC read: %08x = %08x\n", s->ioregsel, val);
#endif
    }
    return val;
}

static void ioapic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
    IOAPICState *s = opaque;
    int index;

    addr &= 0xff;
    if (addr == 0x00)  {
        s->ioregsel = val;
        return;
    } else if (addr == 0x10) {
#ifdef DEBUG_IOAPIC
        printf("I/O APIC write: %08x = %08x\n", s->ioregsel, val);
#endif
        switch (s->ioregsel) {
            case 0x00:
                s->id = (val >> 24) & 0xff;
                return;
            case 0x01:
            case 0x02:
                return;
            default:
                index = (s->ioregsel - 0x10) >> 1;
                if (index >= 0 && index < IOAPIC_NUM_PINS) {
                    if (s->ioregsel & 1) {
                        s->ioredtbl[index] &= 0xffffffff;
                        s->ioredtbl[index] |= (uint64_t)val << 32;
                    } else {
                        s->ioredtbl[index] &= ~0xffffffffULL;
                        s->ioredtbl[index] |= val;
                    }
                    ioapic_service(s);
                }
        }
    }
}

static void ioapic_save(QEMUFile *f, void *opaque)
{
    IOAPICState *s = opaque;
    int i;

    qemu_put_8s(f, &s->id);
    qemu_put_8s(f, &s->ioregsel);
    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
        qemu_put_be64s(f, &s->ioredtbl[i]);
    }
}

static int ioapic_load(QEMUFile *f, void *opaque, int version_id)
{
    IOAPICState *s = opaque;
    int i;

    if (version_id != 1)
        return -EINVAL;

    qemu_get_8s(f, &s->id);
    qemu_get_8s(f, &s->ioregsel);
    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
        qemu_get_be64s(f, &s->ioredtbl[i]);
    }
    return 0;
}

static void ioapic_reset(void *opaque)
{
    IOAPICState *s = opaque;
    int i;

    memset(s, 0, sizeof(*s));
    for(i = 0; i < IOAPIC_NUM_PINS; i++)
        s->ioredtbl[i] = 1 << 16; /* mask LVT */
}

static CPUReadMemoryFunc *ioapic_mem_read[3] = {
    ioapic_mem_readl,
    ioapic_mem_readl,
    ioapic_mem_readl,
};

static CPUWriteMemoryFunc *ioapic_mem_write[3] = {
    ioapic_mem_writel,
    ioapic_mem_writel,
    ioapic_mem_writel,
};

IOAPICState *ioapic_init(void)
{
    IOAPICState *s;
    int io_memory;

    s = qemu_mallocz(sizeof(IOAPICState));
    if (!s)
        return NULL;
    ioapic_reset(s);
    s->id = last_apic_id++;

    io_memory = cpu_register_io_memory(0, ioapic_mem_read, 
                                       ioapic_mem_write, s);
    cpu_register_physical_memory(0xfec00000, 0x1000, io_memory);

    register_savevm("ioapic", 0, 1, ioapic_save, ioapic_load, s);
    qemu_register_reset(ioapic_reset, s);
    
    return s;
}