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1 /* |
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2 * This component and the accompanying materials are made available |
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3 * under the terms of the License "Eclipse Public License v1.0" |
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4 * which accompanies this distribution, and is available |
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5 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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6 * |
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7 * Initial Contributors: |
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8 * Accenture Ltd |
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9 * |
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10 * Contributors: |
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11 * |
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12 * Description: This file is a part of sound driver for Syborg adaptation. |
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13 * |
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14 */ |
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15 |
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16 #ifndef VIRTIO_DEFS_H |
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17 #define VIRTIO_DEFS_H |
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18 |
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19 #include <e32def.h> |
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20 #include <kernel.h> // fot TPhysAddr |
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21 |
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22 /// @file virtio_defs.h |
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23 /// most of definitions here come from VirtIo spec |
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24 /// and was made compatible to the qemu backend (which means diverged from spec) |
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25 |
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26 namespace VirtIo |
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27 { |
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28 |
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29 #define POW2ALIGN1(x) ((x)|((x)>>1)) |
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30 #define POW2ALIGN2(x) ((x)|((x)>>2)) |
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31 #define POW2ALIGN4(x) ((x)|((x)>>4)) |
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32 #define POW2ALIGN8(x) ((x)|((x)>>8)) |
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33 #define POW2ALIGN16(x) ((x)|((x)>>16)) |
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34 |
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35 ///@brief Alignes \a x to the closest bigger or equal power2 value |
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36 #define POW2ALIGN(x) (POW2ALIGN16(POW2ALIGN8(POW2ALIGN4(POW2ALIGN2(POW2ALIGN1((x)-1)))))+1) |
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37 |
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38 static const TUint KVirtIoAlignment = 0x1000; |
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39 |
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40 enum |
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41 { |
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42 EStatusReset = 0, |
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43 EStatusAcknowledge = 1, |
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44 EStatusDriverFound = 2, |
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45 EStatusDriverInitialised = 4, |
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46 EStatusFailed = 0x80 |
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47 }; |
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48 |
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49 enum |
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50 { |
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51 EIoID = 0, |
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52 EIoDevType = 1, |
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53 EIoHostFeatures = 2, |
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54 EIoGuestFeatures = 3, |
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55 EIoQueueBase = 4, |
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56 EIoQueueSize = 5, |
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57 EIoQueueSelect = 6, |
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58 EIoQueueNotify = 7, |
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59 EIoStatus = 8, |
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60 EIoInterruptEnable = 9, |
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61 EIoInterruptStatus = 10 |
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62 }; |
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63 |
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64 struct TRingDesc |
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65 { |
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66 enum |
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67 { |
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68 EFlagNext = 1, |
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69 EFlagWrite = 2 |
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70 }; |
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71 |
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72 TUint64 iAddr; // physical address |
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73 TUint32 iLen; |
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74 TUint16 iFlags; |
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75 TUint16 iNext; |
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76 }; |
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77 |
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78 struct TRingAvail |
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79 { |
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80 enum { EFlagInhibitNotifications = 1 }; |
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81 TUint16 iFlags; |
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82 TUint16 iIdx; |
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83 TUint16 iRing[1]; |
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84 }; |
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85 |
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86 struct TRingUsed |
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87 { |
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88 enum { EFlagInhibitNotifications = 1 }; |
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89 TUint16 iFlags; |
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90 TUint16 iIdx; |
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91 struct |
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92 { |
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93 TUint32 iId; |
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94 TUint32 iLen; |
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95 } iRing[1]; |
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96 }; |
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97 |
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98 /// @brief Represents element of scatter gather list |
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99 struct TAddrLen |
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100 { |
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101 TPhysAddr iAddr; |
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102 TUint32 iLen; |
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103 }; |
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104 |
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105 /// Gives a pointer resulting with aliging \a v with \a a. |
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106 /// @note \a a must be power of 2. |
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107 template <typename T> T* Align( T* v, TUint a ) |
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108 { return (T*)( ((TUint8*)v) + ((-(TUint)v)&(a-1)) ); } |
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109 |
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110 /// Gives a pointer resulting with aliging \a v with \a a. |
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111 /// @note \a a must be power of 2. |
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112 template <typename T> T Align( T v, TUint a ) |
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113 { return (v)+((-v)&(a-1)); } |
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114 |
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115 } |
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116 |
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117 #endif |