arm_gic.c.svn-base

我们自己开发的一个OSEK操作系统！不知道可不可以？

#endif
    } else if (offset < 0xfe0) {
        goto bad_reg;
    } else /* offset >= 0xfe0 */ {
        if (offset & 3) {
            res = 0;
        } else {
            res = gic_id[(offset - 0xfe0) >> 2];
        }
    }
    return res;
bad_reg:
    cpu_abort(cpu_single_env, "gic_dist_readb: Bad offset %x\n", (int)offset);
    return 0;
}

static uint32_t gic_dist_readw(void *opaque, target_phys_addr_t offset)
{
    uint32_t val;
    val = gic_dist_readb(opaque, offset);
    val |= gic_dist_readb(opaque, offset + 1) << 8;
    return val;
}

static uint32_t gic_dist_readl(void *opaque, target_phys_addr_t offset)
{
    uint32_t val;
#ifdef NVIC
    gic_state *s = (gic_state *)opaque;
    uint32_t addr;
    addr = offset - s->base;
    if (addr < 0x100 || addr > 0xd00)
        return nvic_readl(s->nvic, addr);
#endif
    val = gic_dist_readw(opaque, offset);
    val |= gic_dist_readw(opaque, offset + 2) << 16;
    return val;
}

static void gic_dist_writeb(void *opaque, target_phys_addr_t offset,
                            uint32_t value)
{
    gic_state *s = (gic_state *)opaque;
    int irq;
    int i;
    int cpu;

    cpu = gic_get_current_cpu();
    offset -= s->base + GIC_DIST_OFFSET;
    if (offset < 0x100) {
#ifdef NVIC
        goto bad_reg;
#else
        if (offset == 0) {
            s->enabled = (value & 1);
            DPRINTF("Distribution %sabled\n", s->enabled ? "En" : "Dis");
        } else if (offset < 4) {
            /* ignored.  */
        } else {
            goto bad_reg;
        }
#endif
    } else if (offset < 0x180) {
        /* Interrupt Set Enable.  */
        irq = (offset - 0x100) * 8 + GIC_BASE_IRQ;
        if (irq >= GIC_NIRQ)
            goto bad_reg;
        if (irq < 16)
          value = 0xff;
        for (i = 0; i < 8; i++) {
            if (value & (1 << i)) {
                int mask = (irq < 32) ? (1 << cpu) : GIC_TARGET(irq);
                if (!GIC_TEST_ENABLED(irq + i))
                    DPRINTF("Enabled IRQ %d\n", irq + i);
                GIC_SET_ENABLED(irq + i);
                /* If a raised level triggered IRQ enabled then mark
                   is as pending.  */
                if (GIC_TEST_LEVEL(irq + i, mask)
                        && !GIC_TEST_TRIGGER(irq + i)) {
                    DPRINTF("Set %d pending mask %x\n", irq + i, mask);
                    GIC_SET_PENDING(irq + i, mask);
                }
            }
        }
    } else if (offset < 0x200) {
        /* Interrupt Clear Enable.  */
        irq = (offset - 0x180) * 8 + GIC_BASE_IRQ;
        if (irq >= GIC_NIRQ)
            goto bad_reg;
        if (irq < 16)
          value = 0;
        for (i = 0; i < 8; i++) {
            if (value & (1 << i)) {
                if (GIC_TEST_ENABLED(irq + i))
                    DPRINTF("Disabled IRQ %d\n", irq + i);
                GIC_CLEAR_ENABLED(irq + i);
            }
        }
    } else if (offset < 0x280) {
        /* Interrupt Set Pending.  */
        irq = (offset - 0x200) * 8 + GIC_BASE_IRQ;
        if (irq >= GIC_NIRQ)
            goto bad_reg;
        if (irq < 16)
          irq = 0;

        for (i = 0; i < 8; i++) {
            if (value & (1 << i)) {
                GIC_SET_PENDING(irq + i, GIC_TARGET(irq));
            }
        }
    } else if (offset < 0x300) {
        /* Interrupt Clear Pending.  */
        irq = (offset - 0x280) * 8 + GIC_BASE_IRQ;
        if (irq >= GIC_NIRQ)
            goto bad_reg;
        for (i = 0; i < 8; i++) {
            /* ??? This currently clears the pending bit for all CPUs, even
               for per-CPU interrupts.  It's unclear whether this is the
               corect behavior.  */
            if (value & (1 << i)) {
                GIC_CLEAR_PENDING(irq + i, ALL_CPU_MASK);
            }
        }
    } else if (offset < 0x400) {
        /* Interrupt Active.  */
        goto bad_reg;
    } else if (offset < 0x800) {
        /* Interrupt Priority.  */
        irq = (offset - 0x400) + GIC_BASE_IRQ;
        if (irq >= GIC_NIRQ)
            goto bad_reg;
        if (irq < 32) {
            s->priority1[irq][cpu] = value;
        } else {
            s->priority2[irq - 32] = value;
        }
#ifndef NVIC
    } else if (offset < 0xc00) {
        /* Interrupt CPU Target.  */
        irq = (offset - 0x800) + GIC_BASE_IRQ;
        if (irq >= GIC_NIRQ)
            goto bad_reg;
        if (irq < 29)
            value = 0;
        else if (irq < 32)
            value = ALL_CPU_MASK;
        s->irq_target[irq] = value & ALL_CPU_MASK;
    } else if (offset < 0xf00) {
        /* Interrupt Configuration.  */
        irq = (offset - 0xc00) * 4 + GIC_BASE_IRQ;
        if (irq >= GIC_NIRQ)
            goto bad_reg;
        if (irq < 32)
            value |= 0xaa;
        for (i = 0; i < 4; i++) {
            if (value & (1 << (i * 2))) {
                GIC_SET_MODEL(irq + i);
            } else {
                GIC_CLEAR_MODEL(irq + i);
            }
            if (value & (2 << (i * 2))) {
                GIC_SET_TRIGGER(irq + i);
            } else {
                GIC_CLEAR_TRIGGER(irq + i);
            }
        }
#endif
    } else {
        /* 0xf00 is only handled for 32-bit writes.  */
        goto bad_reg;
    }
    gic_update(s);
    return;
bad_reg:
    cpu_abort(cpu_single_env, "gic_dist_writeb: Bad offset %x\n", (int)offset);
}

static void gic_dist_writew(void *opaque, target_phys_addr_t offset,
                            uint32_t value)
{
    gic_dist_writeb(opaque, offset, value & 0xff);
    gic_dist_writeb(opaque, offset + 1, value >> 8);
}

static void gic_dist_writel(void *opaque, target_phys_addr_t offset,
                            uint32_t value)
{
    gic_state *s = (gic_state *)opaque;
#ifdef NVIC
    uint32_t addr;
    addr = offset - s->base;
    if (addr < 0x100 || (addr > 0xd00 && addr != 0xf00)) {
        nvic_writel(s->nvic, addr, value);
        return;
    }
#endif
    if (offset - s->base == GIC_DIST_OFFSET + 0xf00) {
        int cpu;
        int irq;
        int mask;

        cpu = gic_get_current_cpu();
        irq = value & 0x3ff;
        switch ((value >> 24) & 3) {
        case 0:
            mask = (value >> 16) & ALL_CPU_MASK;
            break;
        case 1:
            mask = 1 << cpu;
            break;
        case 2:
            mask = ALL_CPU_MASK ^ (1 << cpu);
            break;
        default:
            DPRINTF("Bad Soft Int target filter\n");
            mask = ALL_CPU_MASK;
            break;
        }
        GIC_SET_PENDING(irq, mask);
        gic_update(s);
        return;
    }
    gic_dist_writew(opaque, offset, value & 0xffff);
    gic_dist_writew(opaque, offset + 2, value >> 16);
}

static CPUReadMemoryFunc *gic_dist_readfn[] = {
   gic_dist_readb,
   gic_dist_readw,
   gic_dist_readl
};

static CPUWriteMemoryFunc *gic_dist_writefn[] = {
   gic_dist_writeb,
   gic_dist_writew,
   gic_dist_writel
};

#ifndef NVIC
static uint32_t gic_cpu_read(gic_state *s, int cpu, int offset)
{
    switch (offset) {
    case 0x00: /* Control */
        return s->cpu_enabled[cpu];
    case 0x04: /* Priority mask */
        return s->priority_mask[cpu];
    case 0x08: /* Binary Point */
        /* ??? Not implemented.  */
        return 0;
    case 0x0c: /* Acknowledge */
        return gic_acknowledge_irq(s, cpu);
    case 0x14: /* Runing Priority */
        return s->running_priority[cpu];
    case 0x18: /* Highest Pending Interrupt */
        return s->current_pending[cpu];
    default:
        cpu_abort(cpu_single_env, "gic_cpu_read: Bad offset %x\n",
                  (int)offset);
        return 0;
    }
}

static void gic_cpu_write(gic_state *s, int cpu, int offset, uint32_t value)
{
    switch (offset) {
    case 0x00: /* Control */
        s->cpu_enabled[cpu] = (value & 1);
        DPRINTF("CPU %sabled\n", s->cpu_enabled ? "En" : "Dis");
        break;
    case 0x04: /* Priority mask */
        s->priority_mask[cpu] = (value & 0xff);
        break;
    case 0x08: /* Binary Point */
        /* ??? Not implemented.  */
        break;
    case 0x10: /* End Of Interrupt */
        return gic_complete_irq(s, cpu, value & 0x3ff);
    default:
        cpu_abort(cpu_single_env, "gic_cpu_write: Bad offset %x\n",
                  (int)offset);
        return;
    }
    gic_update(s);
}
#endif

static void gic_reset(gic_state *s)
{
    int i;
    memset(s->irq_state, 0, GIC_NIRQ * sizeof(gic_irq_state));
    for (i = 0 ; i < NCPU; i++) {
        s->priority_mask[i] = 0xf0;
        s->current_pending[i] = 1023;
        s->running_irq[i] = 1023;
        s->running_priority[i] = 0x100;
#ifdef NVIC
        /* The NVIC doesn't have per-cpu interfaces, so enable by default.  */
        s->cpu_enabled[i] = 1;
#else
        s->cpu_enabled[i] = 0;
#endif
    }
    for (i = 0; i < 16; i++) {
        GIC_SET_ENABLED(i);
        GIC_SET_TRIGGER(i);
    }
#ifdef NVIC
    /* The NVIC is always enabled.  */
    s->enabled = 1;
#else
    s->enabled = 0;
#endif
}

static gic_state *gic_init(uint32_t base, qemu_irq *parent_irq)
{
    gic_state *s;
    int iomemtype;
    int i;

    s = (gic_state *)qemu_mallocz(sizeof(gic_state));
    if (!s)
        return NULL;
    s->in = qemu_allocate_irqs(gic_set_irq, s, GIC_NIRQ);
    for (i = 0; i < NCPU; i++) {
        s->parent_irq[i] = parent_irq[i];
    }
    iomemtype = cpu_register_io_memory(0, gic_dist_readfn,
                                       gic_dist_writefn, s);
    cpu_register_physical_memory(base + GIC_DIST_OFFSET, 0x00001000,
                                 iomemtype);
    s->base = base;
    gic_reset(s);
    return s;
}