/* * ioapic.c IOAPIC emulation logic * * Copyright (c) 2004-2005 Fabrice Bellard * * Split the ioapic logic from apic.c * Xiantao Zhang * * 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 . */ #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]; /* global variable from ioapic_common.c */ extern int ioapic_no; 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 >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) == IOAPIC_TRIGGER_LEVEL) { /* level triggered */ if (level) { s->irr |= mask; if (!(entry & IOAPIC_LVT_REMOTE_IRR)) { 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: case IOAPIC_REG_ARB: val = s->id << IOAPIC_ID_SHIFT; break; case IOAPIC_REG_VER: val = IOAPIC_VERSION | ((IOAPIC_NUM_PINS - 1) << IOAPIC_VER_ENTRIES_SHIFT); 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_realize(DeviceState *dev, Error **errp) { IOAPICCommonState *s = IOAPIC_COMMON(dev); memory_region_init_io(&s->io_memory, OBJECT(s), &ioapic_io_ops, s, "ioapic", 0x1000); qdev_init_gpio_in(dev, ioapic_set_irq, IOAPIC_NUM_PINS); ioapics[ioapic_no] = s; } static void ioapic_class_init(ObjectClass *klass, void *data) { IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass); DeviceClass *dc = DEVICE_CLASS(klass); k->realize = ioapic_realize; 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)