/* * QEMU i440FX/PIIX3 PCI Bridge Emulation * * Copyright (c) 2006 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "hw/hw.h" #include "hw/pc.h" #include "hw/pci/pci.h" #include "hw/pci/pci_host.h" #include "hw/isa.h" #include "hw/sysbus.h" #include "qemu/range.h" #include "hw/xen.h" #include "hw/pam.h" #include "sysemu/sysemu.h" /* * I440FX chipset data sheet. * http://download.intel.com/design/chipsets/datashts/29054901.pdf */ typedef struct I440FXState { PCIHostState parent_obj; } I440FXState; #define PIIX_NUM_PIC_IRQS 16 /* i8259 * 2 */ #define PIIX_NUM_PIRQS 4ULL /* PIRQ[A-D] */ #define XEN_PIIX_NUM_PIRQS 128ULL #define PIIX_PIRQC 0x60 /* * Reset Control Register: PCI-accessible ISA-Compatible Register at address * 0xcf9, provided by the PCI/ISA bridge (PIIX3 PCI function 0, 8086:7000). */ #define RCR_IOPORT 0xcf9 typedef struct PIIX3State { PCIDevice dev; /* * bitmap to track pic levels. * The pic level is the logical OR of all the PCI irqs mapped to it * So one PIC level is tracked by PIIX_NUM_PIRQS bits. * * PIRQ is mapped to PIC pins, we track it by * PIIX_NUM_PIRQS * PIIX_NUM_PIC_IRQS = 64 bits with * pic_irq * PIIX_NUM_PIRQS + pirq */ #if PIIX_NUM_PIC_IRQS * PIIX_NUM_PIRQS > 64 #error "unable to encode pic state in 64bit in pic_levels." #endif uint64_t pic_levels; qemu_irq *pic; /* This member isn't used. Just for save/load compatibility */ int32_t pci_irq_levels_vmstate[PIIX_NUM_PIRQS]; /* Reset Control Register contents */ uint8_t rcr; /* IO memory region for Reset Control Register (RCR_IOPORT) */ MemoryRegion rcr_mem; } PIIX3State; struct PCII440FXState { PCIDevice dev; MemoryRegion *system_memory; MemoryRegion *pci_address_space; MemoryRegion *ram_memory; MemoryRegion pci_hole; MemoryRegion pci_hole_64bit; PAMMemoryRegion pam_regions[13]; MemoryRegion smram_region; uint8_t smm_enabled; }; #define I440FX_PAM 0x59 #define I440FX_PAM_SIZE 7 #define I440FX_SMRAM 0x72 static void piix3_set_irq(void *opaque, int pirq, int level); static PCIINTxRoute piix3_route_intx_pin_to_irq(void *opaque, int pci_intx); static void piix3_write_config_xen(PCIDevice *dev, uint32_t address, uint32_t val, int len); /* return the global irq number corresponding to a given device irq pin. We could also use the bus number to have a more precise mapping. */ static int pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx) { int slot_addend; slot_addend = (pci_dev->devfn >> 3) - 1; return (pci_intx + slot_addend) & 3; } static void i440fx_update_memory_mappings(PCII440FXState *d) { int i; memory_region_transaction_begin(); for (i = 0; i < 13; i++) { pam_update(&d->pam_regions[i], i, d->dev.config[I440FX_PAM + ((i + 1) / 2)]); } smram_update(&d->smram_region, d->dev.config[I440FX_SMRAM], d->smm_enabled); memory_region_transaction_commit(); } static void i440fx_set_smm(int val, void *arg) { PCII440FXState *d = arg; memory_region_transaction_begin(); smram_set_smm(&d->smm_enabled, val, d->dev.config[I440FX_SMRAM], &d->smram_region); memory_region_transaction_commit(); } static void i440fx_write_config(PCIDevice *dev, uint32_t address, uint32_t val, int len) { PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev); /* XXX: implement SMRAM.D_LOCK */ pci_default_write_config(dev, address, val, len); if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) || range_covers_byte(address, len, I440FX_SMRAM)) { i440fx_update_memory_mappings(d); } } static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id) { PCII440FXState *d = opaque; int ret, i; ret = pci_device_load(&d->dev, f); if (ret < 0) return ret; i440fx_update_memory_mappings(d); qemu_get_8s(f, &d->smm_enabled); if (version_id == 2) { for (i = 0; i < PIIX_NUM_PIRQS; i++) { qemu_get_be32(f); /* dummy load for compatibility */ } } return 0; } static int i440fx_post_load(void *opaque, int version_id) { PCII440FXState *d = opaque; i440fx_update_memory_mappings(d); return 0; } static const VMStateDescription vmstate_i440fx = { .name = "I440FX", .version_id = 3, .minimum_version_id = 3, .minimum_version_id_old = 1, .load_state_old = i440fx_load_old, .post_load = i440fx_post_load, .fields = (VMStateField []) { VMSTATE_PCI_DEVICE(dev, PCII440FXState), VMSTATE_UINT8(smm_enabled, PCII440FXState), VMSTATE_END_OF_LIST() } }; static int i440fx_pcihost_initfn(SysBusDevice *dev) { PCIHostState *s = PCI_HOST_BRIDGE(dev); memory_region_init_io(&s->conf_mem, &pci_host_conf_le_ops, s, "pci-conf-idx", 4); sysbus_add_io(dev, 0xcf8, &s->conf_mem); sysbus_init_ioports(&s->busdev, 0xcf8, 4); memory_region_init_io(&s->data_mem, &pci_host_data_le_ops, s, "pci-conf-data", 4); sysbus_add_io(dev, 0xcfc, &s->data_mem); sysbus_init_ioports(&s->busdev, 0xcfc, 4); return 0; } static int i440fx_initfn(PCIDevice *dev) { PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev); d->dev.config[I440FX_SMRAM] = 0x02; cpu_smm_register(&i440fx_set_smm, d); return 0; } static PCIBus *i440fx_common_init(const char *device_name, PCII440FXState **pi440fx_state, int *piix3_devfn, ISABus **isa_bus, qemu_irq *pic, MemoryRegion *address_space_mem, MemoryRegion *address_space_io, ram_addr_t ram_size, hwaddr pci_hole_start, hwaddr pci_hole_size, hwaddr pci_hole64_start, hwaddr pci_hole64_size, MemoryRegion *pci_address_space, MemoryRegion *ram_memory) { DeviceState *dev; PCIBus *b; PCIDevice *d; PCIHostState *s; PIIX3State *piix3; PCII440FXState *f; unsigned i; dev = qdev_create(NULL, "i440FX-pcihost"); s = PCI_HOST_BRIDGE(dev); s->address_space = address_space_mem; b = pci_bus_new(dev, NULL, pci_address_space, address_space_io, 0); s->bus = b; object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev), NULL); qdev_init_nofail(dev); d = pci_create_simple(b, 0, device_name); *pi440fx_state = DO_UPCAST(PCII440FXState, dev, d); f = *pi440fx_state; f->system_memory = address_space_mem; f->pci_address_space = pci_address_space; f->ram_memory = ram_memory; memory_region_init_alias(&f->pci_hole, "pci-hole", f->pci_address_space, pci_hole_start, pci_hole_size); memory_region_add_subregion(f->system_memory, pci_hole_start, &f->pci_hole); memory_region_init_alias(&f->pci_hole_64bit, "pci-hole64", f->pci_address_space, pci_hole64_start, pci_hole64_size); if (pci_hole64_size) { memory_region_add_subregion(f->system_memory, pci_hole64_start, &f->pci_hole_64bit); } memory_region_init_alias(&f->smram_region, "smram-region", f->pci_address_space, 0xa0000, 0x20000); memory_region_add_subregion_overlap(f->system_memory, 0xa0000, &f->smram_region, 1); memory_region_set_enabled(&f->smram_region, false); init_pam(f->ram_memory, f->system_memory, f->pci_address_space, &f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE); for (i = 0; i < 12; ++i) { init_pam(f->ram_memory, f->system_memory, f->pci_address_space, &f->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE); } /* Xen supports additional interrupt routes from the PCI devices to * the IOAPIC: the four pins of each PCI device on the bus are also * connected to the IOAPIC directly. * These additional routes can be discovered through ACPI. */ if (xen_enabled()) { piix3 = DO_UPCAST(PIIX3State, dev, pci_create_simple_multifunction(b, -1, true, "PIIX3-xen")); pci_bus_irqs(b, xen_piix3_set_irq, xen_pci_slot_get_pirq, piix3, XEN_PIIX_NUM_PIRQS); } else { piix3 = DO_UPCAST(PIIX3State, dev, pci_create_simple_multifunction(b, -1, true, "PIIX3")); pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3, PIIX_NUM_PIRQS); pci_bus_set_route_irq_fn(b, piix3_route_intx_pin_to_irq); } piix3->pic = pic; *isa_bus = DO_UPCAST(ISABus, qbus, qdev_get_child_bus(&piix3->dev.qdev, "isa.0")); *piix3_devfn = piix3->dev.devfn; ram_size = ram_size / 8 / 1024 / 1024; if (ram_size > 255) ram_size = 255; (*pi440fx_state)->dev.config[0x57]=ram_size; i440fx_update_memory_mappings(f); return b; } PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix3_devfn, ISABus **isa_bus, qemu_irq *pic, MemoryRegion *address_space_mem, MemoryRegion *address_space_io, ram_addr_t ram_size, hwaddr pci_hole_start, hwaddr pci_hole_size, hwaddr pci_hole64_start, hwaddr pci_hole64_size, MemoryRegion *pci_memory, MemoryRegion *ram_memory) { PCIBus *b; b = i440fx_common_init("i440FX", pi440fx_state, piix3_devfn, isa_bus, pic, address_space_mem, address_space_io, ram_size, pci_hole_start, pci_hole_size, pci_hole64_start, pci_hole64_size, pci_memory, ram_memory); return b; } /* PIIX3 PCI to ISA bridge */ static void piix3_set_irq_pic(PIIX3State *piix3, int pic_irq) { qemu_set_irq(piix3->pic[pic_irq], !!(piix3->pic_levels & (((1ULL << PIIX_NUM_PIRQS) - 1) << (pic_irq * PIIX_NUM_PIRQS)))); } static void piix3_set_irq_level(PIIX3State *piix3, int pirq, int level) { int pic_irq; uint64_t mask; pic_irq = piix3->dev.config[PIIX_PIRQC + pirq]; if (pic_irq >= PIIX_NUM_PIC_IRQS) { return; } mask = 1ULL << ((pic_irq * PIIX_NUM_PIRQS) + pirq); piix3->pic_levels &= ~mask; piix3->pic_levels |= mask * !!level; piix3_set_irq_pic(piix3, pic_irq); } static void piix3_set_irq(void *opaque, int pirq, int level) { PIIX3State *piix3 = opaque; piix3_set_irq_level(piix3, pirq, level); } static PCIINTxRoute piix3_route_intx_pin_to_irq(void *opaque, int pin) { PIIX3State *piix3 = opaque; int irq = piix3->dev.config[PIIX_PIRQC + pin]; PCIINTxRoute route; if (irq < PIIX_NUM_PIC_IRQS) { route.mode = PCI_INTX_ENABLED; route.irq = irq; } else { route.mode = PCI_INTX_DISABLED; route.irq = -1; } return route; } /* irq routing is changed. so rebuild bitmap */ static void piix3_update_irq_levels(PIIX3State *piix3) { int pirq; piix3->pic_levels = 0; for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) { piix3_set_irq_level(piix3, pirq, pci_bus_get_irq_level(piix3->dev.bus, pirq)); } } static void piix3_write_config(PCIDevice *dev, uint32_t address, uint32_t val, int len) { pci_default_write_config(dev, address, val, len); if (ranges_overlap(address, len, PIIX_PIRQC, 4)) { PIIX3State *piix3 = DO_UPCAST(PIIX3State, dev, dev); int pic_irq; pci_bus_fire_intx_routing_notifier(piix3->dev.bus); piix3_update_irq_levels(piix3); for (pic_irq = 0; pic_irq < PIIX_NUM_PIC_IRQS; pic_irq++) { piix3_set_irq_pic(piix3, pic_irq); } } } static void piix3_write_config_xen(PCIDevice *dev, uint32_t address, uint32_t val, int len) { xen_piix_pci_write_config_client(address, val, len); piix3_write_config(dev, address, val, len); } static void piix3_reset(void *opaque) { PIIX3State *d = opaque; uint8_t *pci_conf = d->dev.config; pci_conf[0x04] = 0x07; // master, memory and I/O pci_conf[0x05] = 0x00; pci_conf[0x06] = 0x00; pci_conf[0x07] = 0x02; // PCI_status_devsel_medium pci_conf[0x4c] = 0x4d; pci_conf[0x4e] = 0x03; pci_conf[0x4f] = 0x00; pci_conf[0x60] = 0x80; pci_conf[0x61] = 0x80; pci_conf[0x62] = 0x80; pci_conf[0x63] = 0x80; pci_conf[0x69] = 0x02; pci_conf[0x70] = 0x80; pci_conf[0x76] = 0x0c; pci_conf[0x77] = 0x0c; pci_conf[0x78] = 0x02; pci_conf[0x79] = 0x00; pci_conf[0x80] = 0x00; pci_conf[0x82] = 0x00; pci_conf[0xa0] = 0x08; pci_conf[0xa2] = 0x00; pci_conf[0xa3] = 0x00; pci_conf[0xa4] = 0x00; pci_conf[0xa5] = 0x00; pci_conf[0xa6] = 0x00; pci_conf[0xa7] = 0x00; pci_conf[0xa8] = 0x0f; pci_conf[0xaa] = 0x00; pci_conf[0xab] = 0x00; pci_conf[0xac] = 0x00; pci_conf[0xae] = 0x00; d->pic_levels = 0; d->rcr = 0; } static int piix3_post_load(void *opaque, int version_id) { PIIX3State *piix3 = opaque; piix3_update_irq_levels(piix3); return 0; } static void piix3_pre_save(void *opaque) { int i; PIIX3State *piix3 = opaque; for (i = 0; i < ARRAY_SIZE(piix3->pci_irq_levels_vmstate); i++) { piix3->pci_irq_levels_vmstate[i] = pci_bus_get_irq_level(piix3->dev.bus, i); } } static bool piix3_rcr_needed(void *opaque) { PIIX3State *piix3 = opaque; return (piix3->rcr != 0); } static const VMStateDescription vmstate_piix3_rcr = { .name = "PIIX3/rcr", .version_id = 1, .minimum_version_id = 1, .fields = (VMStateField []) { VMSTATE_UINT8(rcr, PIIX3State), VMSTATE_END_OF_LIST() } }; static const VMStateDescription vmstate_piix3 = { .name = "PIIX3", .version_id = 3, .minimum_version_id = 2, .minimum_version_id_old = 2, .post_load = piix3_post_load, .pre_save = piix3_pre_save, .fields = (VMStateField[]) { VMSTATE_PCI_DEVICE(dev, PIIX3State), VMSTATE_INT32_ARRAY_V(pci_irq_levels_vmstate, PIIX3State, PIIX_NUM_PIRQS, 3), VMSTATE_END_OF_LIST() }, .subsections = (VMStateSubsection[]) { { .vmsd = &vmstate_piix3_rcr, .needed = piix3_rcr_needed, }, { 0 } } }; static void rcr_write(void *opaque, hwaddr addr, uint64_t val, unsigned len) { PIIX3State *d = opaque; if (val & 4) { qemu_system_reset_request(); return; } d->rcr = val & 2; /* keep System Reset type only */ } static uint64_t rcr_read(void *opaque, hwaddr addr, unsigned len) { PIIX3State *d = opaque; return d->rcr; } static const MemoryRegionOps rcr_ops = { .read = rcr_read, .write = rcr_write, .endianness = DEVICE_LITTLE_ENDIAN }; static int piix3_initfn(PCIDevice *dev) { PIIX3State *d = DO_UPCAST(PIIX3State, dev, dev); isa_bus_new(&d->dev.qdev, pci_address_space_io(dev)); memory_region_init_io(&d->rcr_mem, &rcr_ops, d, "piix3-reset-control", 1); memory_region_add_subregion_overlap(pci_address_space_io(dev), RCR_IOPORT, &d->rcr_mem, 1); qemu_register_reset(piix3_reset, d); return 0; } static void piix3_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); dc->desc = "ISA bridge"; dc->vmsd = &vmstate_piix3; dc->no_user = 1, k->no_hotplug = 1; k->init = piix3_initfn; k->config_write = piix3_write_config; k->vendor_id = PCI_VENDOR_ID_INTEL; k->device_id = PCI_DEVICE_ID_INTEL_82371SB_0; // 82371SB PIIX3 PCI-to-ISA bridge (Step A1) k->class_id = PCI_CLASS_BRIDGE_ISA; } static const TypeInfo piix3_info = { .name = "PIIX3", .parent = TYPE_PCI_DEVICE, .instance_size = sizeof(PIIX3State), .class_init = piix3_class_init, }; static void piix3_xen_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); dc->desc = "ISA bridge"; dc->vmsd = &vmstate_piix3; dc->no_user = 1; k->no_hotplug = 1; k->init = piix3_initfn; k->config_write = piix3_write_config_xen; k->vendor_id = PCI_VENDOR_ID_INTEL; k->device_id = PCI_DEVICE_ID_INTEL_82371SB_0; // 82371SB PIIX3 PCI-to-ISA bridge (Step A1) k->class_id = PCI_CLASS_BRIDGE_ISA; }; static const TypeInfo piix3_xen_info = { .name = "PIIX3-xen", .parent = TYPE_PCI_DEVICE, .instance_size = sizeof(PIIX3State), .class_init = piix3_xen_class_init, }; static void i440fx_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); k->no_hotplug = 1; k->init = i440fx_initfn; k->config_write = i440fx_write_config; k->vendor_id = PCI_VENDOR_ID_INTEL; k->device_id = PCI_DEVICE_ID_INTEL_82441; k->revision = 0x02; k->class_id = PCI_CLASS_BRIDGE_HOST; dc->desc = "Host bridge"; dc->no_user = 1; dc->vmsd = &vmstate_i440fx; } static const TypeInfo i440fx_info = { .name = "i440FX", .parent = TYPE_PCI_DEVICE, .instance_size = sizeof(PCII440FXState), .class_init = i440fx_class_init, }; static void i440fx_pcihost_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); k->init = i440fx_pcihost_initfn; dc->fw_name = "pci"; dc->no_user = 1; } static const TypeInfo i440fx_pcihost_info = { .name = "i440FX-pcihost", .parent = TYPE_PCI_HOST_BRIDGE, .instance_size = sizeof(I440FXState), .class_init = i440fx_pcihost_class_init, }; static void i440fx_register_types(void) { type_register_static(&i440fx_info); type_register_static(&piix3_info); type_register_static(&piix3_xen_info); type_register_static(&i440fx_pcihost_info); } type_init(i440fx_register_types)