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
43 lines
1.2 KiB
INI
43 lines
1.2 KiB
INI
## @file
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# This driver produces the VirtIo Device Protocol instances for VirtIo Mmio
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# Device
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#
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# Copyright (C) 2013, ARM Ltd
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#
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# This program and the accompanying materials are licensed and made available
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# under the terms and conditions of the BSD License which accompanies this
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# distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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# WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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##
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[Defines]
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INF_VERSION = 0x00010006
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BASE_NAME = VirtioMmioDeviceLib
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FILE_GUID = 3b6ed966-b5d1-46a8-965b-867ff22d9c89
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MODULE_TYPE = UEFI_DRIVER
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VERSION_STRING = 1.0
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LIBRARY_CLASS = VirtioMmioDeviceLib
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[Sources]
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VirtioMmioDevice.c
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VirtioMmioDeviceFunctions.c
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[Packages]
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MdePkg/MdePkg.dec
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OvmfPkg/OvmfPkg.dec
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[LibraryClasses]
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BaseMemoryLib
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DebugLib
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IoLib
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MemoryAllocationLib
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UefiBootServicesTableLib
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UefiLib
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[Protocols]
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gVirtioDeviceProtocolGuid ## PRODUCES
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