diff options
Diffstat (limited to 'hw/i386/isapc.c')
| -rw-r--r-- | hw/i386/isapc.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/hw/i386/isapc.c b/hw/i386/isapc.c new file mode 100644 index 0000000..44f4a44 --- /dev/null +++ b/hw/i386/isapc.c @@ -0,0 +1,189 @@ +/* + * QEMU PC System Emulator + * + * Copyright (c) 2003-2004 Fabrice Bellard + * + * SPDX-License-Identifier: MIT + */ + +#include "qemu/osdep.h" + +#include "qemu/units.h" +#include "qemu/error-report.h" +#include "hw/char/parallel-isa.h" +#include "hw/dma/i8257.h" +#include "hw/i386/pc.h" +#include "hw/ide/isa.h" +#include "hw/ide/ide-bus.h" +#include "system/kvm.h" +#include "hw/i386/kvm/clock.h" +#include "hw/xen/xen-x86.h" +#include "system/xen.h" +#include "hw/rtc/mc146818rtc.h" +#include "target/i386/cpu.h" + +static const int ide_iobase[MAX_IDE_BUS] = { 0x1f0, 0x170 }; +static const int ide_iobase2[MAX_IDE_BUS] = { 0x3f6, 0x376 }; +static const int ide_irq[MAX_IDE_BUS] = { 14, 15 }; + + +static void pc_init_isa(MachineState *machine) +{ + PCMachineState *pcms = PC_MACHINE(machine); + PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); + X86MachineState *x86ms = X86_MACHINE(machine); + MemoryRegion *system_memory = get_system_memory(); + MemoryRegion *system_io = get_system_io(); + ISABus *isa_bus; + uint32_t irq; + GSIState *gsi_state; + MemoryRegion *ram_memory; + DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS]; + int i; + + /* + * There is a small chance that someone unintentionally passes "-cpu max" + * for the isapc machine, which will provide a much more modern 32-bit + * CPU than would be expected for an ISA-era PC. If the "max" cpu type has + * been specified, choose the "best" 32-bit cpu possible which we consider + * be the pentium3 (deliberately choosing an Intel CPU given that the + * default 486 CPU for the isapc machine is also an Intel CPU). + */ + if (!strcmp(machine->cpu_type, X86_CPU_TYPE_NAME("max"))) { + machine->cpu_type = X86_CPU_TYPE_NAME("pentium3"); + warn_report("-cpu max is invalid for isapc machine, using pentium3"); + } + + /* + * Similarly if someone unintentionally passes "-cpu host" for the isapc + * machine then display a warning and also switch to the "best" 32-bit + * cpu possible which we consider to be the pentium3. This is because any + * host CPU will already be modern than this, but it also ensures any + * newer CPU flags/features are filtered out for older guests. + */ + if (!strcmp(machine->cpu_type, X86_CPU_TYPE_NAME("host"))) { + machine->cpu_type = X86_CPU_TYPE_NAME("pentium3"); + warn_report("-cpu host is invalid for isapc machine, using pentium3"); + } + + if (machine->ram_size > 3.5 * GiB) { + error_report("Too much memory for this machine: %" PRId64 " MiB, " + "maximum 3584 MiB", machine->ram_size / MiB); + exit(1); + } + + /* + * There is no RAM split for the isapc machine + */ + if (xen_enabled()) { + xen_hvm_init_pc(pcms, &ram_memory); + } else { + ram_memory = machine->ram; + + pcms->max_ram_below_4g = 3.5 * GiB; + x86ms->above_4g_mem_size = 0; + x86ms->below_4g_mem_size = machine->ram_size; + } + + x86_cpus_init(x86ms, pcmc->default_cpu_version); + + if (kvm_enabled()) { + kvmclock_create(pcmc->kvmclock_create_always); + } + + /* allocate ram and load rom/bios */ + if (!xen_enabled()) { + pc_memory_init(pcms, system_memory, system_memory, 0); + } else { + assert(machine->ram_size == x86ms->below_4g_mem_size + + x86ms->above_4g_mem_size); + + if (machine->kernel_filename != NULL) { + /* For xen HVM direct kernel boot, load linux here */ + xen_load_linux(pcms); + } + } + + gsi_state = pc_gsi_create(&x86ms->gsi, false); + + isa_bus = isa_bus_new(NULL, system_memory, system_io, + &error_abort); + isa_bus_register_input_irqs(isa_bus, x86ms->gsi); + + x86ms->rtc = isa_new(TYPE_MC146818_RTC); + qdev_prop_set_int32(DEVICE(x86ms->rtc), "base_year", 2000); + isa_realize_and_unref(x86ms->rtc, isa_bus, &error_fatal); + irq = object_property_get_uint(OBJECT(x86ms->rtc), "irq", + &error_fatal); + isa_connect_gpio_out(ISA_DEVICE(x86ms->rtc), 0, irq); + + i8257_dma_init(OBJECT(machine), isa_bus, 0); + pcms->hpet_enabled = false; + + if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) { + pc_i8259_create(isa_bus, gsi_state->i8259_irq); + } + + if (tcg_enabled()) { + x86_register_ferr_irq(x86ms->gsi[13]); + } + + pc_vga_init(isa_bus, NULL); + + /* init basic PC hardware */ + pc_basic_device_init(pcms, isa_bus, x86ms->gsi, x86ms->rtc, + !MACHINE_CLASS(pcmc)->no_floppy, 0x4); + + pc_nic_init(pcmc, isa_bus, NULL); + + ide_drive_get(hd, ARRAY_SIZE(hd)); + for (i = 0; i < MAX_IDE_BUS; i++) { + ISADevice *dev; + char busname[] = "ide.0"; + dev = isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i], + ide_irq[i], + hd[MAX_IDE_DEVS * i], hd[MAX_IDE_DEVS * i + 1]); + /* + * The ide bus name is ide.0 for the first bus and ide.1 for the + * second one. + */ + busname[4] = '0' + i; + pcms->idebus[i] = qdev_get_child_bus(DEVICE(dev), busname); + } +} + +static void isapc_machine_options(MachineClass *m) +{ + static const char * const valid_cpu_types[] = { + X86_CPU_TYPE_NAME("486"), + X86_CPU_TYPE_NAME("athlon"), + X86_CPU_TYPE_NAME("kvm32"), + X86_CPU_TYPE_NAME("pentium"), + X86_CPU_TYPE_NAME("pentium2"), + X86_CPU_TYPE_NAME("pentium3"), + X86_CPU_TYPE_NAME("qemu32"), + X86_CPU_TYPE_NAME("max"), + X86_CPU_TYPE_NAME("host"), + NULL + }; + PCMachineClass *pcmc = PC_MACHINE_CLASS(m); + + m->desc = "ISA-only PC"; + m->max_cpus = 1; + m->option_rom_has_mr = true; + m->rom_file_has_mr = false; + pcmc->pci_enabled = false; + pcmc->has_acpi_build = false; + pcmc->smbios_defaults = false; + pcmc->gigabyte_align = false; + pcmc->smbios_legacy_mode = true; + pcmc->has_reserved_memory = false; + m->default_nic = "ne2k_isa"; + m->default_cpu_type = X86_CPU_TYPE_NAME("486"); + m->valid_cpu_types = valid_cpu_types; + m->no_floppy = !module_object_class_by_name(TYPE_ISA_FDC); + m->no_parallel = !module_object_class_by_name(TYPE_ISA_PARALLEL); +} + +DEFINE_PC_MACHINE(isapc, "isapc", pc_init_isa, + isapc_machine_options); |