| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | /** @file
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| 2 |
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| 3 | Implements
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| 4 | - the SNM.WaitForPacket EVT_NOTIFY_WAIT event,
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| 5 | - the EVT_SIGNAL_EXIT_BOOT_SERVICES event
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| 6 | for the virtio-net driver.
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| 7 |
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| 8 | Copyright (C) 2013, Red Hat, Inc.
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| 9 | Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
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| 10 |
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| 11 | This program and the accompanying materials are licensed and made available
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| 12 | under the terms and conditions of the BSD License which accompanies this
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| 13 | distribution. The full text of the license may be found at
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| 14 | http://opensource.org/licenses/bsd-license.php
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| 15 |
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| 16 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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| 17 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 18 |
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| 19 | **/
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| 20 |
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| 21 | #include <Library/BaseLib.h>
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| 22 | #include <Library/UefiBootServicesTableLib.h>
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| 23 |
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| 24 | #include "VirtioNet.h"
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| 25 |
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| 26 | /**
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| 27 | Invoke a notification event
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| 28 |
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| 29 | @param Event Event whose notification function is being
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| 30 | invoked.
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| 31 | @param Context The pointer to the notification function's
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| 32 | context, which is implementation-dependent.
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| 33 |
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| 34 | **/
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| 35 |
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| 36 | VOID
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| 37 | EFIAPI
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| 38 | VirtioNetIsPacketAvailable (
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| 39 | IN EFI_EVENT Event,
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| 40 | IN VOID *Context
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| 41 | )
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| 42 | {
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| 43 | //
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| 44 | // This callback has been enqueued by an external application and is
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| 45 | // running at TPL_CALLBACK already.
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| 46 | //
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| 47 | // The WaitForPacket logic is similar to that of WaitForKey. The former has
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| 48 | // almost no documentation in either the UEFI-2.3.1+errC spec or the
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| 49 | // DWG-2.3.1, but WaitForKey does have some.
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| 50 | //
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| 51 | VNET_DEV *Dev;
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| 52 | UINT16 RxCurUsed;
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| 53 |
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| 54 | Dev = Context;
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| 55 | if (Dev->Snm.State != EfiSimpleNetworkInitialized) {
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| 56 | return;
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| 57 | }
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| 58 |
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| 59 | //
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| 60 | // virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device
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| 61 | //
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| 62 | MemoryFence ();
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| 63 | RxCurUsed = *Dev->RxRing.Used.Idx;
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| 64 | MemoryFence ();
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| 65 |
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| 66 | if (Dev->RxLastUsed != RxCurUsed) {
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| 67 | gBS->SignalEvent (&Dev->Snp.WaitForPacket);
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| 68 | }
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| 69 | }
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| 70 |
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| 71 | VOID
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| 72 | EFIAPI
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| 73 | VirtioNetExitBoot (
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| 74 | IN EFI_EVENT Event,
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| 75 | IN VOID *Context
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| 76 | )
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| 77 | {
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| 78 | //
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| 79 | // This callback has been enqueued by ExitBootServices() and is running at
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| 80 | // TPL_CALLBACK already.
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| 81 | //
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| 82 | // Shut down pending transfers according to DWG-2.3.1, "25.5.1 Exit Boot
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| 83 | // Services Event".
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| 84 | //
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| 85 | VNET_DEV *Dev;
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| 86 |
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| 87 | Dev = Context;
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| 88 | if (Dev->Snm.State == EfiSimpleNetworkInitialized) {
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| 89 | Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0);
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| 90 | }
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| 91 | }
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