mirror of https://github.com/acidanthera/audk.git
6fb4e772a0
Why is the virtio-mmio implementation of the protocol a library,
instead of a driver binary?
The UEFI driver model would encourage to create a virtio-mmio driver
instead of a library. But the reasons why I created a library are:
- A virtio-mmio driver would imply an additional protocol that would
probably have a single attribute field:
typedef struct {
PHYSICAL_ADDRESS BaseAddress;
} VIRTIO_MMIO_DEVICE_PROTOCOL;
- There is no (easy) way to scan the available VirtIo devices on a
platform. So, the UEFI firmware for this platform would need a driver
to produce instances for every virtio devices it wants to expose in
UEFI. A single call to a helper library (ie: VirtioMmioDeviceLib)
make the porting easier.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
v5:
- typo fix in VirtioMmioInstallDevice() comment block
- plug MmioDevice leak in VirtioMmioUninstallDevice()
- return EFI_INVALID_PARAMETER in VirtioMmioGetQueueAddress() if
QueueAddress is NULL
- VirtioMmioSetQueueSize(): fix return value (it's a status code)
- VirtioMmioSetPageSize(): check against EFI_PAGE_SIZE with "if" plus
EFI_UNSUPPORTED, rather than ASSERT()
- VirtioMmioDeviceWrite(), VirtioMmioDeviceRead(): remove redundant
(FieldSize > 8) checks
- VirtioMmioDeviceLib.inf: drop UefiDriverEntryPoint library dependency
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14965 6f19259b-4bc3-4df7-8a09-765794883524
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|---|---|---|
| .. | ||
| AcpiPlatformDxe | ||
| AcpiTables | ||
| BlockMmioToBlockIoDxe | ||
| Csm | ||
| EmuVariableFvbRuntimeDxe | ||
| Include | ||
| Library | ||
| PlatformPei | ||
| QemuFlashFvbServicesRuntimeDxe | ||
| QemuVideoDxe | ||
| ResetVector | ||
| Sec | ||
| SecureBootConfigDxe | ||
| SmbiosPlatformDxe | ||
| VirtioBlkDxe | ||
| VirtioNetDxe | ||
| VirtioPciDeviceDxe | ||
| VirtioScsiDxe | ||
| Contributions.txt | ||
| License.txt | ||
| OvmfPkg.dec | ||
| OvmfPkgIa32.dsc | ||
| OvmfPkgIa32.fdf | ||
| OvmfPkgIa32X64.dsc | ||
| OvmfPkgIa32X64.fdf | ||
| OvmfPkgX64.dsc | ||
| OvmfPkgX64.fdf | ||
| README | ||
| build.sh | ||
| create-release.py | ||
README
=== OVMF OVERVIEW === The Open Virtual Machine Firmware (OVMF) project aims to support firmware for Virtual Machines using the edk2 code base. More information can be found at: http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=OVMF === STATUS === Current status: Alpha Current capabilities: * IA32 and X64 architectures * QEMU (0.10.0 or later) - Video, keyboard, IDE, CD-ROM, serial - Runs UEFI shell - Optional NIC support. Requires QEMU (0.12.2 or later) * UEFI Linux boots * UEFI Windows 8 boots === FUTURE PLANS === * Stabilize UEFI Linux boot * Test/Stabilize UEFI Self-Certification Tests (SCT) results === BUILDING OVMF === Pre-requisites: * Build environment capable of build the edk2 MdeModulePkg. * A properly configured ASL compiler: - Intel ASL compiler: Available from http://www.acpica.org - Microsoft ASL compiler: Available from http://www.acpi.info Update Conf/target.txt ACTIVE_PLATFORM for OVMF: PEI arch DXE arch UEFI interfaces * OvmfPkg/OvmfPkgIa32.dsc IA32 IA32 IA32 * OvmfPkg/OvmfPkgIa32X64.dsc IA32 X64 X64 * OvmfPkg/OvmfPkgX64.dsc X64 X64 X64 Update Conf/target.txt TARGET_ARCH based on the .dsc file: TARGET_ARCH * OvmfPkg/OvmfPkgIa32.dsc IA32 * OvmfPkg/OvmfPkgIa32X64.dsc IA32 X64 * OvmfPkg/OvmfPkgX64.dsc X64 Following the edk2 build process, you will find the OVMF binaries under the $WORKSPACE/Build/*/*/FV directory. The actual path will depend on how your build is configured. You can expect to find these binary outputs: * OVMF.FD - Please note! This filename has changed. Older releases used OVMF.Fv. * OvmfVideo.rom - This file is not built separately any longer, starting with svn r13520. More information on building OVMF can be found at: http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=How_to_build_OVMF === RUNNING OVMF on QEMU === * QEMU 0.9.1 or later is required. * Either copy, rename or symlink OVMF.FD => bios.bin * Be sure to use qemu-system-x86_64, if you are using and X64 firmware. (qemu-system-x86_64 works for the IA32 firmware as well, of course.) * Use the QEMU -L parameter to specify the directory where the bios.bin file is located. * The EFI shell is built into OVMF builds at this time, so it should run automatically if a UEFI boot application is not found on the removable media. * On Linux, newer version of QEMU may enable KVM feature, and this might cause OVMF to fail to boot. The QEMU '-no-kvm' may allow OVMF to boot. * Capturing OVMF debug messages on qemu: - The default OVMF build writes debug messages to IO port 0x402. The following qemu command line options save them in the file called debug.log: '-debugcon file:debug.log -global isa-debugcon.iobase=0x402'. - It is possible to revert to the original behavior, when debug messages were written to the emulated serial port (potentially intermixing OVMF debug output with UEFI serial console output). For this the '-D DEBUG_ON_SERIAL_PORT' option has to be passed to the build command (see the next section), and in order to capture the serial output qemu needs to be started with eg. '-serial file:serial.log'. - Debug messages fall into several categories. Logged vs. suppressed categories are controlled at OVMF build time by the 'gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel' bitmask (an UINT32 value) in the selected .dsc file. Individual bits of this bitmask are defined in <MdePkg/Include/Library/DebugLib.h>. One non-default bit (with some performance impact) that is frequently set for debugging is 0x00400000 (DEBUG_VERBOSE). - The RELEASE build target ('-b RELEASE' build option, see below) disables all debug messages. The default build target is DEBUG. === Build Scripts === On systems with the bash shell you can use OvmfPkg/build.sh to simplify building and running OVMF. So, for example, to build + run OVMF X64: $ OvmfPkg/build.sh -a X64 $ OvmfPkg/build.sh -a X64 qemu And to run a 64-bit UEFI bootable ISO image: $ OvmfPkg/build.sh -a X64 qemu -cdrom /path/to/disk-image.iso To build a 32-bit OVMF without debug messages using GCC 4.5: $ OvmfPkg/build.sh -a IA32 -b RELEASE -t GCC45 === Network Support === OVMF provides a UEFI network stack by default. Its lowest level driver is the NIC driver, higher levels are generic. In order to make DHCP, PXE Boot, and eg. socket test utilities from the StdLib edk2 package work, (1) qemu has to be configured to emulate a NIC, (2) a matching UEFI NIC driver must be available when OVMF boots. (If a NIC is configured for the virtual machine, and -- dependent on boot order -- PXE booting is attempted, but no DHCP server responds to OVMF's DHCP DISCOVER message at startup, the boot process may take approx. 3 seconds longer.) * For each NIC emulated by qemu, a GPLv2 licensed UEFI driver is available from the iPXE project. The qemu source distribution, starting with version 1.5, contains prebuilt binaries of these drivers (and of course allows one to rebuild them from source as well). This is the recommended set of drivers. * Use the qemu -netdev and -device options, or the legacy -net option, to enable NIC support: <http://wiki.qemu.org/Documentation/Networking>. * For a qemu >= 1.5 binary running *without* any "-M machine" option where "machine" would identify a < qemu-1.5 configuration (for example: "-M pc-i440fx-1.4" or "-M pc-0.13"), the iPXE drivers are automatically available to and configured for OVMF in the default qemu installation. * For a qemu binary in [0.13, 1.5), or a qemu >= 1.5 binary with an "-M machine" option where "machine" selects a < qemu-1.5 configuration: - download a >= 1.5.0-rc1 source tarball from <http://wiki.qemu.org/Download>, - extract the following iPXE driver files from the tarball and install them in a location that is accessible to qemu processes (this may depend on your SELinux configuration, for example): qemu-VERSION/pc-bios/efi-e1000.rom qemu-VERSION/pc-bios/efi-ne2k_pci.rom qemu-VERSION/pc-bios/efi-pcnet.rom qemu-VERSION/pc-bios/efi-rtl8139.rom qemu-VERSION/pc-bios/efi-virtio.rom - extend the NIC's -device option on the qemu command line with a matching "romfile=" optarg: -device e1000,...,romfile=/full/path/to/efi-e1000.rom -device ne2k_pci,...,romfile=/full/path/to/efi-ne2k_pci.rom -device pcnet,...,romfile=/full/path/to/efi-pcnet.rom -device rtl8139,...,romfile=/full/path/to/efi-rtl8139.rom -device virtio-net-pci,...,romfile=/full/path/to/efi-virtio.rom * Independently of the iPXE NIC drivers, the default OVMF build provides a basic virtio-net driver, located in OvmfPkg/VirtioNetDxe. * Also independently of the iPXE NIC drivers, Intel's proprietary E1000 NIC driver (PROEFI) can be embedded in the OVMF image at build time: - Download UEFI drivers for the e1000 NIC - http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=17515&lang=eng - Install the drivers into a directory called Intel3.5 in your WORKSPACE. - Include the driver in OVMF during the build: - Add "-D E1000_ENABLE -D FD_SIZE_2MB" to your build command, - For example: "build -D E1000_ENABLE -D FD_SIZE_2MB". * When a matching iPXE driver is configured for a NIC as described above, it takes priority over other drivers that could possibly drive the card too: | e1000 ne2k_pci pcnet rtl8139 virtio-net-pci -------------+------------------------------------------------ iPXE | x x x x x VirtioNetDxe | x Intel PROEFI | x === OVMF Flash Layout === Like all current IA32/X64 system designs, OVMF's firmware device (rom/flash) appears in QEMU's physical address space just below 4GB (0x100000000). The layout of the firmware device in memory looks like: +--------------------------------------- 4GB (0x100000000) | VTF0 (16-bit reset code) and OVMF SEC | (SECFV) +--------------------------------------- varies based on flash size | | Compressed main firmware image | (FVMAIN_COMPACT) | +--------------------------------------- base + 0x20000 | Fault-tolerant write (FTW) | Spare blocks (64KB/0x10000) +--------------------------------------- base + 0x10000 | FTW Work block (4KB/0x1000) +--------------------------------------- base + 0x0f000 | Event log area (4KB/0x1000) +--------------------------------------- base + 0x0e000 | Non-volatile variable storage | area (56KB/0xe000) +--------------------------------------- base address OVMF supports building a 1MB or a 2MB flash image. The base address for a 1MB image in QEMU physical memory is 0xfff00000. The base address for a 2MB image is 0xffe00000. The code in SECFV locates FVMAIN_COMPACT, and decompresses the main firmware (MAINFV) into RAM memory at address 0x800000. The remaining OVMF firmware then uses this decompressed firmware volume image. === UNIXGCC Debug === If you build with the UNIXGCC toolchain, then debugging will be disabled due to larger image sizes being produced by the UNIXGCC toolchain. The first choice recommendation is to use GCC44 or newer instead. If you must use UNIXGCC, then you can override the build options for particular libraries and modules in the .dsc to re-enable debugging selectively. For example: [Components] OvmfPkg/Library/PlatformBdsLib/PlatformBdsLib.inf { <BuildOptions> GCC:*_*_*_CC_FLAGS = -UMDEPKG_NDEBUG } IntelFrameworkModulePkg/Universal/BdsDxe/BdsDxe.inf { <BuildOptions> GCC:*_*_*_CC_FLAGS = -UMDEPKG_NDEBUG }