--- /dev/null
+/*
+ * Arm PrimeCell PL190 Vector Interrupt Controller
+ *
+ * Copyright (c) 2006 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licensed under the GPL.
+ */
+
+#include "hw/sysbus.h"
+
+/* The number of virtual priority levels. 16 user vectors plus the
+ unvectored IRQ. Chained interrupts would require an additional level
+ if implemented. */
+
+#define PL190_NUM_PRIO 17
+
+#define TYPE_PL190 "pl190"
+#define PL190(obj) OBJECT_CHECK(PL190State, (obj), TYPE_PL190)
+
+typedef struct PL190State {
+ SysBusDevice parent_obj;
+
+ MemoryRegion iomem;
+ uint32_t level;
+ uint32_t soft_level;
+ uint32_t irq_enable;
+ uint32_t fiq_select;
+ uint8_t vect_control[16];
+ uint32_t vect_addr[PL190_NUM_PRIO];
+ /* Mask containing interrupts with higher priority than this one. */
+ uint32_t prio_mask[PL190_NUM_PRIO + 1];
+ int protected;
+ /* Current priority level. */
+ int priority;
+ int prev_prio[PL190_NUM_PRIO];
+ qemu_irq irq;
+ qemu_irq fiq;
+} PL190State;
+
+static const unsigned char pl190_id[] =
+{ 0x90, 0x11, 0x04, 0x00, 0x0D, 0xf0, 0x05, 0xb1 };
+
+static inline uint32_t pl190_irq_level(PL190State *s)
+{
+ return (s->level | s->soft_level) & s->irq_enable & ~s->fiq_select;
+}
+
+/* Update interrupts. */
+static void pl190_update(PL190State *s)
+{
+ uint32_t level = pl190_irq_level(s);
+ int set;
+
+ set = (level & s->prio_mask[s->priority]) != 0;
+ qemu_set_irq(s->irq, set);
+ set = ((s->level | s->soft_level) & s->fiq_select) != 0;
+ qemu_set_irq(s->fiq, set);
+}
+
+static void pl190_set_irq(void *opaque, int irq, int level)
+{
+ PL190State *s = (PL190State *)opaque;
+
+ if (level)
+ s->level |= 1u << irq;
+ else
+ s->level &= ~(1u << irq);
+ pl190_update(s);
+}
+
+static void pl190_update_vectors(PL190State *s)
+{
+ uint32_t mask;
+ int i;
+ int n;
+
+ mask = 0;
+ for (i = 0; i < 16; i++)
+ {
+ s->prio_mask[i] = mask;
+ if (s->vect_control[i] & 0x20)
+ {
+ n = s->vect_control[i] & 0x1f;
+ mask |= 1 << n;
+ }
+ }
+ s->prio_mask[16] = mask;
+ pl190_update(s);
+}
+
+static uint64_t pl190_read(void *opaque, hwaddr offset,
+ unsigned size)
+{
+ PL190State *s = (PL190State *)opaque;
+ int i;
+
+ if (offset >= 0xfe0 && offset < 0x1000) {
+ return pl190_id[(offset - 0xfe0) >> 2];
+ }
+ if (offset >= 0x100 && offset < 0x140) {
+ return s->vect_addr[(offset - 0x100) >> 2];
+ }
+ if (offset >= 0x200 && offset < 0x240) {
+ return s->vect_control[(offset - 0x200) >> 2];
+ }
+ switch (offset >> 2) {
+ case 0: /* IRQSTATUS */
+ return pl190_irq_level(s);
+ case 1: /* FIQSATUS */
+ return (s->level | s->soft_level) & s->fiq_select;
+ case 2: /* RAWINTR */
+ return s->level | s->soft_level;
+ case 3: /* INTSELECT */
+ return s->fiq_select;
+ case 4: /* INTENABLE */
+ return s->irq_enable;
+ case 6: /* SOFTINT */
+ return s->soft_level;
+ case 8: /* PROTECTION */
+ return s->protected;
+ case 12: /* VECTADDR */
+ /* Read vector address at the start of an ISR. Increases the
+ * current priority level to that of the current interrupt.
+ *
+ * Since an enabled interrupt X at priority P causes prio_mask[Y]
+ * to have bit X set for all Y > P, this loop will stop with
+ * i == the priority of the highest priority set interrupt.
+ */
+ for (i = 0; i < s->priority; i++) {
+ if ((s->level | s->soft_level) & s->prio_mask[i + 1]) {
+ break;
+ }
+ }
+
+ /* Reading this value with no pending interrupts is undefined.
+ We return the default address. */
+ if (i == PL190_NUM_PRIO)
+ return s->vect_addr[16];
+ if (i < s->priority)
+ {
+ s->prev_prio[i] = s->priority;
+ s->priority = i;
+ pl190_update(s);
+ }
+ return s->vect_addr[s->priority];
+ case 13: /* DEFVECTADDR */
+ return s->vect_addr[16];
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "pl190_read: Bad offset %x\n", (int)offset);
+ return 0;
+ }
+}
+
+static void pl190_write(void *opaque, hwaddr offset,
+ uint64_t val, unsigned size)
+{
+ PL190State *s = (PL190State *)opaque;
+
+ if (offset >= 0x100 && offset < 0x140) {
+ s->vect_addr[(offset - 0x100) >> 2] = val;
+ pl190_update_vectors(s);
+ return;
+ }
+ if (offset >= 0x200 && offset < 0x240) {
+ s->vect_control[(offset - 0x200) >> 2] = val;
+ pl190_update_vectors(s);
+ return;
+ }
+ switch (offset >> 2) {
+ case 0: /* SELECT */
+ /* This is a readonly register, but linux tries to write to it
+ anyway. Ignore the write. */
+ break;
+ case 3: /* INTSELECT */
+ s->fiq_select = val;
+ break;
+ case 4: /* INTENABLE */
+ s->irq_enable |= val;
+ break;
+ case 5: /* INTENCLEAR */
+ s->irq_enable &= ~val;
+ break;
+ case 6: /* SOFTINT */
+ s->soft_level |= val;
+ break;
+ case 7: /* SOFTINTCLEAR */
+ s->soft_level &= ~val;
+ break;
+ case 8: /* PROTECTION */
+ /* TODO: Protection (supervisor only access) is not implemented. */
+ s->protected = val & 1;
+ break;
+ case 12: /* VECTADDR */
+ /* Restore the previous priority level. The value written is
+ ignored. */
+ if (s->priority < PL190_NUM_PRIO)
+ s->priority = s->prev_prio[s->priority];
+ break;
+ case 13: /* DEFVECTADDR */
+ s->vect_addr[16] = val;
+ break;
+ case 0xc0: /* ITCR */
+ if (val) {
+ qemu_log_mask(LOG_UNIMP, "pl190: Test mode not implemented\n");
+ }
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "pl190_write: Bad offset %x\n", (int)offset);
+ return;
+ }
+ pl190_update(s);
+}
+
+static const MemoryRegionOps pl190_ops = {
+ .read = pl190_read,
+ .write = pl190_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void pl190_reset(DeviceState *d)
+{
+ PL190State *s = PL190(d);
+ int i;
+
+ for (i = 0; i < 16; i++) {
+ s->vect_addr[i] = 0;
+ s->vect_control[i] = 0;
+ }
+ s->vect_addr[16] = 0;
+ s->prio_mask[17] = 0xffffffff;
+ s->priority = PL190_NUM_PRIO;
+ pl190_update_vectors(s);
+}
+
+static int pl190_init(SysBusDevice *sbd)
+{
+ DeviceState *dev = DEVICE(sbd);
+ PL190State *s = PL190(dev);
+
+ memory_region_init_io(&s->iomem, OBJECT(s), &pl190_ops, s, "pl190", 0x1000);
+ sysbus_init_mmio(sbd, &s->iomem);
+ qdev_init_gpio_in(dev, pl190_set_irq, 32);
+ sysbus_init_irq(sbd, &s->irq);
+ sysbus_init_irq(sbd, &s->fiq);
+ return 0;
+}
+
+static const VMStateDescription vmstate_pl190 = {
+ .name = "pl190",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(level, PL190State),
+ VMSTATE_UINT32(soft_level, PL190State),
+ VMSTATE_UINT32(irq_enable, PL190State),
+ VMSTATE_UINT32(fiq_select, PL190State),
+ VMSTATE_UINT8_ARRAY(vect_control, PL190State, 16),
+ VMSTATE_UINT32_ARRAY(vect_addr, PL190State, PL190_NUM_PRIO),
+ VMSTATE_UINT32_ARRAY(prio_mask, PL190State, PL190_NUM_PRIO+1),
+ VMSTATE_INT32(protected, PL190State),
+ VMSTATE_INT32(priority, PL190State),
+ VMSTATE_INT32_ARRAY(prev_prio, PL190State, PL190_NUM_PRIO),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void pl190_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+ k->init = pl190_init;
+ dc->reset = pl190_reset;
+ dc->vmsd = &vmstate_pl190;
+}
+
+static const TypeInfo pl190_info = {
+ .name = TYPE_PL190,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(PL190State),
+ .class_init = pl190_class_init,
+};
+
+static void pl190_register_types(void)
+{
+ type_register_static(&pl190_info);
+}
+
+type_init(pl190_register_types)
Code Review / kvmfornfv.git / blobdiff