/* * QEMU i440FX 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 "qemu/osdep.h" #include "qemu/units.h" #include "qemu/range.h" #include "hw/i386/pc.h" #include "hw/pci/pci.h" #include "hw/pci/pci_host.h" #include "hw/pci-host/i440fx.h" #include "hw/qdev-properties.h" #include "hw/sysbus.h" #include "qapi/error.h" #include "migration/vmstate.h" #include "qapi/visitor.h" #include "qemu/error-report.h" #include "qom/object.h" /* * I440FX chipset data sheet. * https://wiki.qemu.org/File:29054901.pdf */ OBJECT_DECLARE_SIMPLE_TYPE(I440FXState, I440FX_PCI_HOST_BRIDGE) struct I440FXState { PCIHostState parent_obj; MemoryRegion *system_memory; MemoryRegion *io_memory; MemoryRegion *pci_address_space; MemoryRegion *ram_memory; Range pci_hole; uint64_t below_4g_mem_size; uint64_t above_4g_mem_size; uint64_t pci_hole64_size; bool pci_hole64_fix; uint32_t short_root_bus; }; #define I440FX_PAM 0x59 #define I440FX_PAM_SIZE 7 #define I440FX_SMRAM 0x72 /* Keep it 2G to comply with older win32 guests */ #define I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT (1ULL << 31) /* Older coreboot versions (4.0 and older) read a config register that doesn't * exist in real hardware, to get the RAM size from QEMU. */ #define I440FX_COREBOOT_RAM_SIZE 0x57 static void i440fx_realize(PCIDevice *dev, Error **errp) { dev->config[I440FX_SMRAM] = 0x02; if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) { warn_report("i440fx doesn't support emulated iommu"); } } static void i440fx_update_memory_mappings(PCII440FXState *d) { int i; PCIDevice *pd = PCI_DEVICE(d); memory_region_transaction_begin(); for (i = 0; i < ARRAY_SIZE(d->pam_regions); i++) { pam_update(&d->pam_regions[i], i, pd->config[I440FX_PAM + DIV_ROUND_UP(i, 2)]); } memory_region_set_enabled(&d->smram_region, !(pd->config[I440FX_SMRAM] & SMRAM_D_OPEN)); memory_region_set_enabled(&d->smram, pd->config[I440FX_SMRAM] & SMRAM_G_SMRAME); memory_region_transaction_commit(); } static void i440fx_write_config(PCIDevice *dev, uint32_t address, uint32_t val, int len) { PCII440FXState *d = I440FX_PCI_DEVICE(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_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, .post_load = i440fx_post_load, .fields = (VMStateField[]) { VMSTATE_PCI_DEVICE(parent_obj, PCII440FXState), /* Used to be smm_enabled, which was basically always zero because * SeaBIOS hardly uses SMM. SMRAM is now handled by CPU code. */ VMSTATE_UNUSED(1), VMSTATE_END_OF_LIST() } }; static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); uint64_t val64; uint32_t value; val64 = range_is_empty(&s->pci_hole) ? 0 : range_lob(&s->pci_hole); value = val64; assert(value == val64); visit_type_uint32(v, name, &value, errp); } static void i440fx_pcihost_get_pci_hole_end(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); uint64_t val64; uint32_t value; val64 = range_is_empty(&s->pci_hole) ? 0 : range_upb(&s->pci_hole) + 1; value = val64; assert(value == val64); visit_type_uint32(v, name, &value, errp); } /* * The 64bit PCI hole start is set by the Guest firmware * as the address of the first 64bit PCI MEM resource. * If no PCI device has resources on the 64bit area, * the 64bit PCI hole will start after "over 4G RAM" and the * reserved space for memory hotplug if any. */ static uint64_t i440fx_pcihost_get_pci_hole64_start_value(Object *obj) { PCIHostState *h = PCI_HOST_BRIDGE(obj); I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); Range w64; uint64_t value; pci_bus_get_w64_range(h->bus, &w64); value = range_is_empty(&w64) ? 0 : range_lob(&w64); if (!value && s->pci_hole64_fix) { value = pc_pci_hole64_start(); } return value; } static void i440fx_pcihost_get_pci_hole64_start(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj); visit_type_uint64(v, name, &hole64_start, errp); } /* * The 64bit PCI hole end is set by the Guest firmware * as the address of the last 64bit PCI MEM resource. * Then it is expanded to the PCI_HOST_PROP_PCI_HOLE64_SIZE * that can be configured by the user. */ static void i440fx_pcihost_get_pci_hole64_end(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { PCIHostState *h = PCI_HOST_BRIDGE(obj); I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj); Range w64; uint64_t value, hole64_end; pci_bus_get_w64_range(h->bus, &w64); value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1; hole64_end = ROUND_UP(hole64_start + s->pci_hole64_size, 1ULL << 30); if (s->pci_hole64_fix && value < hole64_end) { value = hole64_end; } visit_type_uint64(v, name, &value, errp); } static void i440fx_pcihost_initfn(Object *obj) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj); PCIHostState *phb = PCI_HOST_BRIDGE(obj); memory_region_init_io(&phb->conf_mem, obj, &pci_host_conf_le_ops, phb, "pci-conf-idx", 4); memory_region_init_io(&phb->data_mem, obj, &pci_host_data_le_ops, phb, "pci-conf-data", 4); object_property_add_link(obj, PCI_HOST_PROP_RAM_MEM, TYPE_MEMORY_REGION, (Object **) &s->ram_memory, qdev_prop_allow_set_link_before_realize, 0); object_property_add_link(obj, PCI_HOST_PROP_PCI_MEM, TYPE_MEMORY_REGION, (Object **) &s->pci_address_space, qdev_prop_allow_set_link_before_realize, 0); object_property_add_link(obj, PCI_HOST_PROP_SYSTEM_MEM, TYPE_MEMORY_REGION, (Object **) &s->system_memory, qdev_prop_allow_set_link_before_realize, 0); object_property_add_link(obj, PCI_HOST_PROP_IO_MEM, TYPE_MEMORY_REGION, (Object **) &s->io_memory, qdev_prop_allow_set_link_before_realize, 0); } static void i440fx_pcihost_realize(DeviceState *dev, Error **errp) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(dev); PCIHostState *phb = PCI_HOST_BRIDGE(dev); SysBusDevice *sbd = SYS_BUS_DEVICE(dev); memory_region_add_subregion(s->io_memory, 0xcf8, &phb->conf_mem); sysbus_init_ioports(sbd, 0xcf8, 4); memory_region_add_subregion(s->io_memory, 0xcfc, &phb->data_mem); sysbus_init_ioports(sbd, 0xcfc, 4); /* register i440fx 0xcf8 port as coalesced pio */ memory_region_set_flush_coalesced(&phb->data_mem); memory_region_add_coalescing(&phb->conf_mem, 0, 4); } PCIBus *i440fx_init(const char *pci_type, DeviceState *dev, MemoryRegion *address_space_mem, MemoryRegion *address_space_io, ram_addr_t below_4g_mem_size, ram_addr_t above_4g_mem_size, MemoryRegion *pci_address_space, MemoryRegion *ram_memory) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(dev); PCIHostState *phb = PCI_HOST_BRIDGE(dev); PCIBus *b; PCIDevice *d; PCII440FXState *f; unsigned i; s->system_memory = address_space_mem; s->io_memory = address_space_io; s->pci_address_space = pci_address_space; s->ram_memory = ram_memory; s->below_4g_mem_size = below_4g_mem_size; s->above_4g_mem_size = above_4g_mem_size; b = pci_root_bus_new(dev, NULL, s->pci_address_space, s->io_memory, 0, TYPE_PCI_BUS); phb->bus = b; sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); d = pci_create_simple(b, 0, pci_type); f = I440FX_PCI_DEVICE(d); range_set_bounds(&s->pci_hole, s->below_4g_mem_size, IO_APIC_DEFAULT_ADDRESS - 1); /* setup pci memory mapping */ pc_pci_as_mapping_init(s->system_memory, s->pci_address_space); /* if *disabled* show SMRAM to all CPUs */ memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region", s->pci_address_space, SMRAM_C_BASE, SMRAM_C_SIZE); memory_region_add_subregion_overlap(s->system_memory, SMRAM_C_BASE, &f->smram_region, 1); memory_region_set_enabled(&f->smram_region, true); /* smram, as seen by SMM CPUs */ memory_region_init(&f->smram, OBJECT(d), "smram", 4 * GiB); memory_region_set_enabled(&f->smram, true); memory_region_init_alias(&f->low_smram, OBJECT(d), "smram-low", s->ram_memory, SMRAM_C_BASE, SMRAM_C_SIZE); memory_region_set_enabled(&f->low_smram, true); memory_region_add_subregion(&f->smram, SMRAM_C_BASE, &f->low_smram); object_property_add_const_link(qdev_get_machine(), "smram", OBJECT(&f->smram)); init_pam(&f->pam_regions[0], OBJECT(d), s->ram_memory, s->system_memory, s->pci_address_space, PAM_BIOS_BASE, PAM_BIOS_SIZE); for (i = 0; i < ARRAY_SIZE(f->pam_regions) - 1; ++i) { init_pam(&f->pam_regions[i + 1], OBJECT(d), s->ram_memory, s->system_memory, s->pci_address_space, PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE, PAM_EXPAN_SIZE); } ram_addr_t ram_size = s->below_4g_mem_size + s->above_4g_mem_size; ram_size = ram_size / 8 / 1024 / 1024; if (ram_size > 255) { ram_size = 255; } d->config[I440FX_COREBOOT_RAM_SIZE] = ram_size; i440fx_update_memory_mappings(f); return b; } static void i440fx_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); k->realize = i440fx_realize; 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->vmsd = &vmstate_i440fx; /* * PCI-facing part of the host bridge, not usable without the * host-facing part, which can't be device_add'ed, yet. */ dc->user_creatable = false; dc->hotpluggable = false; } static const TypeInfo i440fx_info = { .name = TYPE_I440FX_PCI_DEVICE, .parent = TYPE_PCI_DEVICE, .instance_size = sizeof(PCII440FXState), .class_init = i440fx_class_init, .interfaces = (InterfaceInfo[]) { { INTERFACE_CONVENTIONAL_PCI_DEVICE }, { }, }, }; static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge, PCIBus *rootbus) { I440FXState *s = I440FX_PCI_HOST_BRIDGE(host_bridge); /* For backwards compat with old device paths */ if (s->short_root_bus) { return "0000"; } return "0000:00"; } static Property i440fx_props[] = { DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, I440FXState, pci_hole64_size, I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT), DEFINE_PROP_UINT32("short_root_bus", I440FXState, short_root_bus, 0), DEFINE_PROP_SIZE(PCI_HOST_BELOW_4G_MEM_SIZE, I440FXState, below_4g_mem_size, 0), DEFINE_PROP_SIZE(PCI_HOST_ABOVE_4G_MEM_SIZE, I440FXState, above_4g_mem_size, 0), DEFINE_PROP_BOOL("x-pci-hole64-fix", I440FXState, pci_hole64_fix, true), DEFINE_PROP_END_OF_LIST(), }; static void i440fx_pcihost_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass); hc->root_bus_path = i440fx_pcihost_root_bus_path; dc->realize = i440fx_pcihost_realize; dc->fw_name = "pci"; device_class_set_props(dc, i440fx_props); /* Reason: needs to be wired up by pc_init1 */ dc->user_creatable = false; object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE_START, "uint32", i440fx_pcihost_get_pci_hole_start, NULL, NULL, NULL); object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE_END, "uint32", i440fx_pcihost_get_pci_hole_end, NULL, NULL, NULL); object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE64_START, "uint64", i440fx_pcihost_get_pci_hole64_start, NULL, NULL, NULL); object_class_property_add(klass, PCI_HOST_PROP_PCI_HOLE64_END, "uint64", i440fx_pcihost_get_pci_hole64_end, NULL, NULL, NULL); } static const TypeInfo i440fx_pcihost_info = { .name = TYPE_I440FX_PCI_HOST_BRIDGE, .parent = TYPE_PCI_HOST_BRIDGE, .instance_size = sizeof(I440FXState), .instance_init = i440fx_pcihost_initfn, .class_init = i440fx_pcihost_class_init, }; static void i440fx_register_types(void) { type_register_static(&i440fx_info); type_register_static(&i440fx_pcihost_info); } type_init(i440fx_register_types)