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-rw-r--r--hw/intc/ioapic.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c
new file mode 100644
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--- /dev/null
+++ b/hw/intc/ioapic.c
@@ -0,0 +1,258 @@
+/*
+ * ioapic.c IOAPIC emulation logic
+ *
+ * Copyright (c) 2004-2005 Fabrice Bellard
+ *
+ * Split the ioapic logic from apic.c
+ * Xiantao Zhang <xiantao.zhang@intel.com>
+ *
+ * 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 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/>.
+ */
+
+#include "hw/hw.h"
+#include "hw/i386/pc.h"
+#include "hw/i386/ioapic.h"
+#include "hw/i386/ioapic_internal.h"
+
+//#define DEBUG_IOAPIC
+
+#ifdef DEBUG_IOAPIC
+#define DPRINTF(fmt, ...) \
+ do { printf("ioapic: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...)
+#endif
+
+static IOAPICCommonState *ioapics[MAX_IOAPICS];
+
+static void ioapic_service(IOAPICCommonState *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;
+
+ for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+ mask = 1 << i;
+ if (s->irr & mask) {
+ entry = s->ioredtbl[i];
+ if (!(entry & IOAPIC_LVT_MASKED)) {
+ trig_mode = ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1);
+ dest = entry >> IOAPIC_LVT_DEST_SHIFT;
+ dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1;
+ delivery_mode =
+ (entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) & IOAPIC_DM_MASK;
+ if (trig_mode == IOAPIC_TRIGGER_EDGE) {
+ s->irr &= ~mask;
+ } else {
+ s->ioredtbl[i] |= IOAPIC_LVT_REMOTE_IRR;
+ }
+ if (delivery_mode == IOAPIC_DM_EXTINT) {
+ vector = pic_read_irq(isa_pic);
+ } else {
+ vector = entry & IOAPIC_VECTOR_MASK;
+ }
+ apic_deliver_irq(dest, dest_mode, delivery_mode,
+ vector, trig_mode);
+ }
+ }
+ }
+}
+
+static void ioapic_set_irq(void *opaque, int vector, int level)
+{
+ IOAPICCommonState *s = opaque;
+
+ /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
+ * to GSI 2. GSI maps to ioapic 1-1. This is not
+ * the cleanest way of doing it but it should work. */
+
+ DPRINTF("%s: %s vec %x\n", __func__, level ? "raise" : "lower", vector);
+ if (vector == 0) {
+ vector = 2;
+ }
+ if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
+ uint32_t mask = 1 << vector;
+ uint64_t entry = s->ioredtbl[vector];
+
+ if (entry & (1 << IOAPIC_LVT_POLARITY_SHIFT)) {
+ level = !level;
+ }
+ if (((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) ==
+ IOAPIC_TRIGGER_LEVEL) {
+ /* level triggered */
+ if (level) {
+ s->irr |= mask;
+ ioapic_service(s);
+ } else {
+ s->irr &= ~mask;
+ }
+ } else {
+ /* According to the 82093AA manual, we must ignore edge requests
+ * if the input pin is masked. */
+ if (level && !(entry & IOAPIC_LVT_MASKED)) {
+ s->irr |= mask;
+ ioapic_service(s);
+ }
+ }
+ }
+}
+
+void ioapic_eoi_broadcast(int vector)
+{
+ IOAPICCommonState *s;
+ uint64_t entry;
+ int i, n;
+
+ for (i = 0; i < MAX_IOAPICS; i++) {
+ s = ioapics[i];
+ if (!s) {
+ continue;
+ }
+ for (n = 0; n < IOAPIC_NUM_PINS; n++) {
+ entry = s->ioredtbl[n];
+ if ((entry & IOAPIC_LVT_REMOTE_IRR)
+ && (entry & IOAPIC_VECTOR_MASK) == vector) {
+ s->ioredtbl[n] = entry & ~IOAPIC_LVT_REMOTE_IRR;
+ if (!(entry & IOAPIC_LVT_MASKED) && (s->irr & (1 << n))) {
+ ioapic_service(s);
+ }
+ }
+ }
+ }
+}
+
+static uint64_t
+ioapic_mem_read(void *opaque, hwaddr addr, unsigned int size)
+{
+ IOAPICCommonState *s = opaque;
+ int index;
+ uint32_t val = 0;
+
+ switch (addr & 0xff) {
+ case IOAPIC_IOREGSEL:
+ val = s->ioregsel;
+ break;
+ case IOAPIC_IOWIN:
+ if (size != 4) {
+ break;
+ }
+ switch (s->ioregsel) {
+ case IOAPIC_REG_ID:
+ val = s->id << IOAPIC_ID_SHIFT;
+ break;
+ case IOAPIC_REG_VER:
+ val = IOAPIC_VERSION |
+ ((IOAPIC_NUM_PINS - 1) << IOAPIC_VER_ENTRIES_SHIFT);
+ break;
+ case IOAPIC_REG_ARB:
+ val = 0;
+ break;
+ default:
+ index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 1;
+ if (index >= 0 && index < IOAPIC_NUM_PINS) {
+ if (s->ioregsel & 1) {
+ val = s->ioredtbl[index] >> 32;
+ } else {
+ val = s->ioredtbl[index] & 0xffffffff;
+ }
+ }
+ }
+ DPRINTF("read: %08x = %08x\n", s->ioregsel, val);
+ break;
+ }
+ return val;
+}
+
+static void
+ioapic_mem_write(void *opaque, hwaddr addr, uint64_t val,
+ unsigned int size)
+{
+ IOAPICCommonState *s = opaque;
+ int index;
+
+ switch (addr & 0xff) {
+ case IOAPIC_IOREGSEL:
+ s->ioregsel = val;
+ break;
+ case IOAPIC_IOWIN:
+ if (size != 4) {
+ break;
+ }
+ DPRINTF("write: %08x = %08" PRIx64 "\n", s->ioregsel, val);
+ switch (s->ioregsel) {
+ case IOAPIC_REG_ID:
+ s->id = (val >> IOAPIC_ID_SHIFT) & IOAPIC_ID_MASK;
+ break;
+ case IOAPIC_REG_VER:
+ case IOAPIC_REG_ARB:
+ break;
+ default:
+ index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 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);
+ }
+ }
+ break;
+ }
+}
+
+static const MemoryRegionOps ioapic_io_ops = {
+ .read = ioapic_mem_read,
+ .write = ioapic_mem_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void ioapic_init(IOAPICCommonState *s, int instance_no)
+{
+ memory_region_init_io(&s->io_memory, &ioapic_io_ops, s, "ioapic", 0x1000);
+
+ qdev_init_gpio_in(&s->busdev.qdev, ioapic_set_irq, IOAPIC_NUM_PINS);
+
+ ioapics[instance_no] = s;
+}
+
+static void ioapic_class_init(ObjectClass *klass, void *data)
+{
+ IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass);
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ k->init = ioapic_init;
+ dc->reset = ioapic_reset_common;
+}
+
+static const TypeInfo ioapic_info = {
+ .name = "ioapic",
+ .parent = TYPE_IOAPIC_COMMON,
+ .instance_size = sizeof(IOAPICCommonState),
+ .class_init = ioapic_class_init,
+};
+
+static void ioapic_register_types(void)
+{
+ type_register_static(&ioapic_info);
+}
+
+type_init(ioapic_register_types)
generated by cgit v1.1 at 2024-12-25 01:35:42 +0000