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qemu-e2k/hw/i386/pc_piix.c
Markus Armbruster 9953f8822c pc: Kill the "use flash device for BIOS unless KVM" misfeature 
Use of a flash memory device for the BIOS was added in series "[PATCH
v10 0/8] PC system flash support", commit 4732dca..1b89faf, v1.1.

Flash vs. ROM is a guest-visible difference.  Thus, flash use had to
be suppressed for machine types pc-1.0 and older.  This was
accomplished by adding a dummy device "pc-sysfw" with property
"rom_only":

* Non-zero rom_only means "use ROM".  Default for pc-1.0 and older.
* Zero rom_only means "maybe use flash".  Default for newer machines.

Not only is the dummy device ugly, it was also retroactively added to
the older machine types!  Fortunately, it's not guest-visible (thus no
immediate guest ABI breakage), and has no vmstate (thus no immediate
migration breakage).  Breakage occurs only if the user unwisely
enables flash by setting rom_only to zero.  Patch review FAIL #1.

Why "maybe use flash"?  Flash didn't (and still doesn't) work with
KVM.  Therefore, rom_only=0 really means "use flash, except when KVM
is enabled, use ROM".  This is a Bad Idea, because it makes enabling/
disabling KVM guest-visible.  Patch review FAIL #2.

Aside: it also precludes migrating between KVM on and off, but that's
not possible for other reasons anyway.

Fix as follows:

1. Change the meaning of rom_only=0 to mean "use flash, no ifs, buts,
or maybes" for pc-i440fx-1.5 and pc-q35-1.5.  Don't change anything
for older machines (to remain bug-compatible).

2. Change the default value from 0 to 1 for these machines.
Necessary, because 0 doesn't work with KVM.  Once it does, we can flip
the default back to 0.

3. Don't revert the retroactive addition of device "pc-sysfw" to older
machine types.  Seems not worth the trouble.

4. Add a TODO comment asking for device "pc-sysfw" to be dropped once
flash works with KVM.

Net effect is that you get a BIOS ROM again even when KVM is disabled,
just like for machines predating the introduction of flash.

To get flash instead, use "--global pc-sysfw.rom_only=0".

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1365780303-26398-4-git-send-email-armbru@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-04-24 13:23:51 -05:00

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/*
* QEMU PC System Emulator
*
* Copyright (c) 2003-2004 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 <glib.h>
#include "hw/hw.h"
#include "hw/i386/pc.h"
#include "hw/i386/apic.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_ids.h"
#include "hw/usb.h"
#include "net/net.h"
#include "hw/boards.h"
#include "hw/ide.h"
#include "sysemu/kvm.h"
#include "hw/kvm/clock.h"
#include "sysemu/sysemu.h"
#include "hw/sysbus.h"
#include "sysemu/arch_init.h"
#include "sysemu/blockdev.h"
#include "hw/i2c/smbus.h"
#include "hw/xen/xen.h"
#include "exec/memory.h"
#include "exec/address-spaces.h"
#include "hw/acpi/acpi.h"
#include "cpu.h"
#ifdef CONFIG_XEN
# include <xen/hvm/hvm_info_table.h>
#endif
#define MAX_IDE_BUS 2
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 };
/* PC hardware initialisation */
static void pc_init1(MemoryRegion *system_memory,
MemoryRegion *system_io,
ram_addr_t ram_size,
const char *boot_device,
const char *kernel_filename,
const char *kernel_cmdline,
const char *initrd_filename,
const char *cpu_model,
int pci_enabled,
int kvmclock_enabled)
{
int i;
ram_addr_t below_4g_mem_size, above_4g_mem_size;
PCIBus *pci_bus;
ISABus *isa_bus;
PCII440FXState *i440fx_state;
int piix3_devfn = -1;
qemu_irq *cpu_irq;
qemu_irq *gsi;
qemu_irq *i8259;
qemu_irq *smi_irq;
GSIState *gsi_state;
DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
BusState *idebus[MAX_IDE_BUS];
ISADevice *rtc_state;
ISADevice *floppy;
MemoryRegion *ram_memory;
MemoryRegion *pci_memory;
MemoryRegion *rom_memory;
void *fw_cfg = NULL;
pc_cpus_init(cpu_model);
pc_acpi_init("acpi-dsdt.aml");
if (kvmclock_enabled) {
kvmclock_create();
}
if (ram_size >= 0xe0000000 ) {
above_4g_mem_size = ram_size - 0xe0000000;
below_4g_mem_size = 0xe0000000;
} else {
above_4g_mem_size = 0;
below_4g_mem_size = ram_size;
}
if (pci_enabled) {
pci_memory = g_new(MemoryRegion, 1);
memory_region_init(pci_memory, "pci", INT64_MAX);
rom_memory = pci_memory;
} else {
pci_memory = NULL;
rom_memory = system_memory;
}
/* allocate ram and load rom/bios */
if (!xen_enabled()) {
fw_cfg = pc_memory_init(system_memory,
kernel_filename, kernel_cmdline, initrd_filename,
below_4g_mem_size, above_4g_mem_size,
rom_memory, &ram_memory);
}
gsi_state = g_malloc0(sizeof(*gsi_state));
if (kvm_irqchip_in_kernel()) {
kvm_pc_setup_irq_routing(pci_enabled);
gsi = qemu_allocate_irqs(kvm_pc_gsi_handler, gsi_state,
GSI_NUM_PINS);
} else {
gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS);
}
if (pci_enabled) {
pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
system_memory, system_io, ram_size,
below_4g_mem_size,
0x100000000ULL - below_4g_mem_size,
0x100000000ULL + above_4g_mem_size,
(sizeof(hwaddr) == 4
? 0
: ((uint64_t)1 << 62)),
pci_memory, ram_memory);
} else {
pci_bus = NULL;
i440fx_state = NULL;
isa_bus = isa_bus_new(NULL, system_io);
no_hpet = 1;
}
isa_bus_irqs(isa_bus, gsi);
if (kvm_irqchip_in_kernel()) {
i8259 = kvm_i8259_init(isa_bus);
} else if (xen_enabled()) {
i8259 = xen_interrupt_controller_init();
} else {
cpu_irq = pc_allocate_cpu_irq();
i8259 = i8259_init(isa_bus, cpu_irq[0]);
}
for (i = 0; i < ISA_NUM_IRQS; i++) {
gsi_state->i8259_irq[i] = i8259[i];
}
if (pci_enabled) {
ioapic_init_gsi(gsi_state, "i440fx");
}
pc_register_ferr_irq(gsi[13]);
pc_vga_init(isa_bus, pci_enabled ? pci_bus : NULL);
if (xen_enabled()) {
pci_create_simple(pci_bus, -1, "xen-platform");
}
/* init basic PC hardware */
pc_basic_device_init(isa_bus, gsi, &rtc_state, &floppy, xen_enabled());
pc_nic_init(isa_bus, pci_bus);
ide_drive_get(hd, MAX_IDE_BUS);
if (pci_enabled) {
PCIDevice *dev;
if (xen_enabled()) {
dev = pci_piix3_xen_ide_init(pci_bus, hd, piix3_devfn + 1);
} else {
dev = pci_piix3_ide_init(pci_bus, hd, piix3_devfn + 1);
}
idebus[0] = qdev_get_child_bus(&dev->qdev, "ide.0");
idebus[1] = qdev_get_child_bus(&dev->qdev, "ide.1");
} else {
for(i = 0; i < MAX_IDE_BUS; i++) {
ISADevice *dev;
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]);
idebus[i] = qdev_get_child_bus(&dev->qdev, "ide.0");
}
}
audio_init(isa_bus, pci_enabled ? pci_bus : NULL);
pc_cmos_init(below_4g_mem_size, above_4g_mem_size, boot_device,
floppy, idebus[0], idebus[1], rtc_state);
if (pci_enabled && usb_enabled(false)) {
pci_create_simple(pci_bus, piix3_devfn + 2, "piix3-usb-uhci");
}
if (pci_enabled && acpi_enabled) {
i2c_bus *smbus;
smi_irq = qemu_allocate_irqs(pc_acpi_smi_interrupt,
x86_env_get_cpu(first_cpu), 1);
/* TODO: Populate SPD eeprom data. */
smbus = piix4_pm_init(pci_bus, piix3_devfn + 3, 0xb100,
gsi[9], *smi_irq,
kvm_enabled(), fw_cfg);
smbus_eeprom_init(smbus, 8, NULL, 0);
}
if (pci_enabled) {
pc_pci_device_init(pci_bus);
}
}
static void pc_init_pci(QEMUMachineInitArgs *args)
{
ram_addr_t ram_size = args->ram_size;
const char *cpu_model = args->cpu_model;
const char *kernel_filename = args->kernel_filename;
const char *kernel_cmdline = args->kernel_cmdline;
const char *initrd_filename = args->initrd_filename;
const char *boot_device = args->boot_device;
pc_init1(get_system_memory(),
get_system_io(),
ram_size, boot_device,
kernel_filename, kernel_cmdline,
initrd_filename, cpu_model, 1, 1);
}
static void pc_init_pci_1_4(QEMUMachineInitArgs *args)
{
pc_sysfw_flash_vs_rom_bug_compatible = true;
pc_init_pci(args);
}
static void pc_init_pci_1_3(QEMUMachineInitArgs *args)
{
enable_compat_apic_id_mode();
pc_sysfw_flash_vs_rom_bug_compatible = true;
pc_init_pci(args);
}
/* PC machine init function for pc-1.1 to pc-1.2 */
static void pc_init_pci_1_2(QEMUMachineInitArgs *args)
{
disable_kvm_pv_eoi();
enable_compat_apic_id_mode();
pc_sysfw_flash_vs_rom_bug_compatible = true;
pc_init_pci(args);
}
/* PC machine init function for pc-0.14 to pc-1.0 */
static void pc_init_pci_1_0(QEMUMachineInitArgs *args)
{
disable_kvm_pv_eoi();
enable_compat_apic_id_mode();
pc_init_pci(args);
}
/* PC init function for pc-0.10 to pc-0.13, and reused by xenfv */
static void pc_init_pci_no_kvmclock(QEMUMachineInitArgs *args)
{
ram_addr_t ram_size = args->ram_size;
const char *cpu_model = args->cpu_model;
const char *kernel_filename = args->kernel_filename;
const char *kernel_cmdline = args->kernel_cmdline;
const char *initrd_filename = args->initrd_filename;
const char *boot_device = args->boot_device;
disable_kvm_pv_eoi();
enable_compat_apic_id_mode();
pc_init1(get_system_memory(),
get_system_io(),
ram_size, boot_device,
kernel_filename, kernel_cmdline,
initrd_filename, cpu_model, 1, 0);
}
static void pc_init_isa(QEMUMachineInitArgs *args)
{
ram_addr_t ram_size = args->ram_size;
const char *cpu_model = args->cpu_model;
const char *kernel_filename = args->kernel_filename;
const char *kernel_cmdline = args->kernel_cmdline;
const char *initrd_filename = args->initrd_filename;
const char *boot_device = args->boot_device;
if (cpu_model == NULL)
cpu_model = "486";
disable_kvm_pv_eoi();
enable_compat_apic_id_mode();
pc_init1(get_system_memory(),
get_system_io(),
ram_size, boot_device,
kernel_filename, kernel_cmdline,
initrd_filename, cpu_model, 0, 1);
}
#ifdef CONFIG_XEN
static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
{
if (xen_hvm_init() != 0) {
hw_error("xen hardware virtual machine initialisation failed");
}
pc_init_pci_no_kvmclock(args);
xen_vcpu_init();
}
#endif
static QEMUMachine pc_i440fx_machine_v1_5 = {
.name = "pc-i440fx-1.5",
.alias = "pc",
.desc = "Standard PC (i440FX + PIIX, 1996)",
.init = pc_init_pci,
.max_cpus = 255,
.is_default = 1,
DEFAULT_MACHINE_OPTIONS,
};
static QEMUMachine pc_i440fx_machine_v1_4 = {
.name = "pc-i440fx-1.4",
.desc = "Standard PC (i440FX + PIIX, 1996)",
.init = pc_init_pci_1_4,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_4,
{ /* end of list */ }
},
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_1_3 \
PC_COMPAT_1_4, \
{\
.driver = "usb-tablet",\
.property = "usb_version",\
.value = stringify(1),\
},{\
.driver = "virtio-net-pci",\
.property = "ctrl_mac_addr",\
.value = "off", \
},{ \
.driver = "virtio-net-pci", \
.property = "mq", \
.value = "off", \
}, {\
.driver = "e1000",\
.property = "autonegotiation",\
.value = "off",\
}
static QEMUMachine pc_machine_v1_3 = {
.name = "pc-1.3",
.desc = "Standard PC",
.init = pc_init_pci_1_3,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_3,
{ /* end of list */ }
},
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_1_2 \
PC_COMPAT_1_3,\
{\
.driver = "nec-usb-xhci",\
.property = "msi",\
.value = "off",\
},{\
.driver = "nec-usb-xhci",\
.property = "msix",\
.value = "off",\
},{\
.driver = "ivshmem",\
.property = "use64",\
.value = "0",\
},{\
.driver = "qxl",\
.property = "revision",\
.value = stringify(3),\
},{\
.driver = "qxl-vga",\
.property = "revision",\
.value = stringify(3),\
},{\
.driver = "VGA",\
.property = "mmio",\
.value = "off",\
}
static QEMUMachine pc_machine_v1_2 = {
.name = "pc-1.2",
.desc = "Standard PC",
.init = pc_init_pci_1_2,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_2,
{ /* end of list */ }
},
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_1_1 \
PC_COMPAT_1_2,\
{\
.driver = "virtio-scsi-pci",\
.property = "hotplug",\
.value = "off",\
},{\
.driver = "virtio-scsi-pci",\
.property = "param_change",\
.value = "off",\
},{\
.driver = "VGA",\
.property = "vgamem_mb",\
.value = stringify(8),\
},{\
.driver = "vmware-svga",\
.property = "vgamem_mb",\
.value = stringify(8),\
},{\
.driver = "qxl-vga",\
.property = "vgamem_mb",\
.value = stringify(8),\
},{\
.driver = "qxl",\
.property = "vgamem_mb",\
.value = stringify(8),\
},{\
.driver = "virtio-blk-pci",\
.property = "config-wce",\
.value = "off",\
}
static QEMUMachine pc_machine_v1_1 = {
.name = "pc-1.1",
.desc = "Standard PC",
.init = pc_init_pci_1_2,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_1,
{ /* end of list */ }
},
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_1_0 \
PC_COMPAT_1_1,\
{\
.driver = "pc-sysfw",\
.property = "rom_only",\
.value = stringify(1),\
}, {\
.driver = "isa-fdc",\
.property = "check_media_rate",\
.value = "off",\
}, {\
.driver = "virtio-balloon-pci",\
.property = "class",\
.value = stringify(PCI_CLASS_MEMORY_RAM),\
},{\
.driver = "apic",\
.property = "vapic",\
.value = "off",\
},{\
.driver = TYPE_USB_DEVICE,\
.property = "full-path",\
.value = "no",\
}
static QEMUMachine pc_machine_v1_0 = {
.name = "pc-1.0",
.desc = "Standard PC",
.init = pc_init_pci_1_0,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_1_0,
{ /* end of list */ }
},
.hw_version = "1.0",
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_0_15 \
PC_COMPAT_1_0
static QEMUMachine pc_machine_v0_15 = {
.name = "pc-0.15",
.desc = "Standard PC",
.init = pc_init_pci_1_0,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_0_15,
{ /* end of list */ }
},
.hw_version = "0.15",
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_0_14 \
PC_COMPAT_0_15,\
{\
.driver = "virtio-blk-pci",\
.property = "event_idx",\
.value = "off",\
},{\
.driver = "virtio-serial-pci",\
.property = "event_idx",\
.value = "off",\
},{\
.driver = "virtio-net-pci",\
.property = "event_idx",\
.value = "off",\
},{\
.driver = "virtio-balloon-pci",\
.property = "event_idx",\
.value = "off",\
}
static QEMUMachine pc_machine_v0_14 = {
.name = "pc-0.14",
.desc = "Standard PC",
.init = pc_init_pci_1_0,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_0_14,
{
.driver = "qxl",
.property = "revision",
.value = stringify(2),
},{
.driver = "qxl-vga",
.property = "revision",
.value = stringify(2),
},
{ /* end of list */ }
},
.hw_version = "0.14",
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_0_13 \
PC_COMPAT_0_14,\
{\
.driver = TYPE_PCI_DEVICE,\
.property = "command_serr_enable",\
.value = "off",\
},{\
.driver = "AC97",\
.property = "use_broken_id",\
.value = stringify(1),\
}
static QEMUMachine pc_machine_v0_13 = {
.name = "pc-0.13",
.desc = "Standard PC",
.init = pc_init_pci_no_kvmclock,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_0_13,
{
.driver = "virtio-9p-pci",
.property = "vectors",
.value = stringify(0),
},{
.driver = "VGA",
.property = "rombar",
.value = stringify(0),
},{
.driver = "vmware-svga",
.property = "rombar",
.value = stringify(0),
},
{ /* end of list */ }
},
.hw_version = "0.13",
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_0_12 \
PC_COMPAT_0_13,\
{\
.driver = "virtio-serial-pci",\
.property = "max_ports",\
.value = stringify(1),\
},{\
.driver = "virtio-serial-pci",\
.property = "vectors",\
.value = stringify(0),\
}
static QEMUMachine pc_machine_v0_12 = {
.name = "pc-0.12",
.desc = "Standard PC",
.init = pc_init_pci_no_kvmclock,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_0_12,
{
.driver = "VGA",
.property = "rombar",
.value = stringify(0),
},{
.driver = "vmware-svga",
.property = "rombar",
.value = stringify(0),
},
{ /* end of list */ }
},
.hw_version = "0.12",
DEFAULT_MACHINE_OPTIONS,
};
#define PC_COMPAT_0_11 \
PC_COMPAT_0_12,\
{\
.driver = "virtio-blk-pci",\
.property = "vectors",\
.value = stringify(0),\
},{\
.driver = TYPE_PCI_DEVICE,\
.property = "rombar",\
.value = stringify(0),\
}
static QEMUMachine pc_machine_v0_11 = {
.name = "pc-0.11",
.desc = "Standard PC, qemu 0.11",
.init = pc_init_pci_no_kvmclock,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_0_11,
{
.driver = "ide-drive",
.property = "ver",
.value = "0.11",
},{
.driver = "scsi-disk",
.property = "ver",
.value = "0.11",
},
{ /* end of list */ }
},
.hw_version = "0.11",
DEFAULT_MACHINE_OPTIONS,
};
static QEMUMachine pc_machine_v0_10 = {
.name = "pc-0.10",
.desc = "Standard PC, qemu 0.10",
.init = pc_init_pci_no_kvmclock,
.max_cpus = 255,
.compat_props = (GlobalProperty[]) {
PC_COMPAT_0_11,
{
.driver = "virtio-blk-pci",
.property = "class",
.value = stringify(PCI_CLASS_STORAGE_OTHER),
},{
.driver = "virtio-serial-pci",
.property = "class",
.value = stringify(PCI_CLASS_DISPLAY_OTHER),
},{
.driver = "virtio-net-pci",
.property = "vectors",
.value = stringify(0),
},{
.driver = "ide-drive",
.property = "ver",
.value = "0.10",
},{
.driver = "scsi-disk",
.property = "ver",
.value = "0.10",
},
{ /* end of list */ }
},
.hw_version = "0.10",
DEFAULT_MACHINE_OPTIONS,
};
static QEMUMachine isapc_machine = {
.name = "isapc",
.desc = "ISA-only PC",
.init = pc_init_isa,
.max_cpus = 1,
.compat_props = (GlobalProperty[]) {
{
.driver = "pc-sysfw",
.property = "rom_only",
.value = stringify(1),
},
{ /* end of list */ }
},
DEFAULT_MACHINE_OPTIONS,
};
#ifdef CONFIG_XEN
static QEMUMachine xenfv_machine = {
.name = "xenfv",
.desc = "Xen Fully-virtualized PC",
.init = pc_xen_hvm_init,
.max_cpus = HVM_MAX_VCPUS,
.default_machine_opts = "accel=xen",
DEFAULT_MACHINE_OPTIONS,
};
#endif
static void pc_machine_init(void)
{
qemu_register_machine(&pc_i440fx_machine_v1_5);
qemu_register_machine(&pc_i440fx_machine_v1_4);
qemu_register_machine(&pc_machine_v1_3);
qemu_register_machine(&pc_machine_v1_2);
qemu_register_machine(&pc_machine_v1_1);
qemu_register_machine(&pc_machine_v1_0);
qemu_register_machine(&pc_machine_v0_15);
qemu_register_machine(&pc_machine_v0_14);
qemu_register_machine(&pc_machine_v0_13);
qemu_register_machine(&pc_machine_v0_12);
qemu_register_machine(&pc_machine_v0_11);
qemu_register_machine(&pc_machine_v0_10);
qemu_register_machine(&isapc_machine);
#ifdef CONFIG_XEN
qemu_register_machine(&xenfv_machine);
#endif
}
machine_init(pc_machine_init);
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