Rev 3725 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
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3555 | Serge | 1 | ; Implementation of periodic transaction scheduler for USB. |
2 | ; Bandwidth dedicated to periodic transactions is limited, so |
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3 | ; different pipes should be scheduled as uniformly as possible. |
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4 | |||
5 | ; USB1 scheduler. |
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6 | ; Algorithm is simple: |
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7 | ; when adding a pipe, optimize the following quantity: |
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8 | ; * for every millisecond, take all bandwidth scheduled to periodic transfers, |
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9 | ; * calculate maximum over all milliseconds, |
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10 | ; * select a variant which minimizes that maximum; |
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11 | ; when removing a pipe, do nothing (except for bookkeeping). |
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12 | |||
13 | ; sanity check: structures in UHCI and OHCI should be the same |
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14 | if (sizeof.ohci_static_ep=sizeof.uhci_static_ep)&(ohci_static_ep.SoftwarePart=uhci_static_ep.SoftwarePart)&(ohci_static_ep.NextList=uhci_static_ep.NextList) |
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15 | ; Select a list for a new pipe. |
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16 | ; in: esi -> usb_controller, maxpacket, type, interval can be found in the stack |
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17 | ; in: ecx = 2 * maximal interval = total number of periodic lists + 1 |
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18 | ; in: edx -> {u|o}hci_static_ep for the first list |
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19 | ; in: eax -> byte past {u|o}hci_static_ep for the last list in the first group |
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20 | ; out: edx -> usb_static_ep for the selected list or zero if failed |
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21 | proc usb1_select_interrupt_list |
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22 | ; inherit some variables from usb_open_pipe |
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3908 | Serge | 23 | virtual at ebp-12 |
24 | .speed db ? |
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25 | rb 3 |
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3555 | Serge | 26 | .bandwidth dd ? |
27 | .target dd ? |
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28 | dd ? |
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29 | dd ? |
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30 | .config_pipe dd ? |
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31 | .endpoint dd ? |
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32 | .maxpacket dd ? |
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33 | .type dd ? |
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34 | .interval dd ? |
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35 | end virtual |
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36 | push ebx edi ; save used registers to be stdcall |
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37 | push eax ; save eax for checks in step 3 |
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38 | ; 1. Only intervals 2^k ms can be supported. |
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39 | ; The core specification says that the real interval should not be greater |
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40 | ; than the interval given by the endpoint descriptor, but can be less. |
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41 | ; Determine the actual interval as 2^k ms. |
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42 | mov eax, ecx |
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43 | ; 1a. Set [.interval] to 1 if it was zero; leave it as is otherwise |
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44 | cmp [.interval], 1 |
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45 | adc [.interval], 0 |
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46 | ; 1b. Divide ecx by two while it is strictly greater than [.interval]. |
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47 | @@: |
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48 | shr ecx, 1 |
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49 | cmp [.interval], ecx |
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50 | jb @b |
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51 | ; ecx = the actual interval |
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52 | ; |
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53 | ; For example, let ecx = 8, eax = 64. |
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54 | ; The scheduler space is 32 milliseconds, |
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55 | ; we need to schedule something every 8 ms; |
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56 | ; there are 8 variants: schedule at times 0,8,16,24, |
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57 | ; schedule at times 1,9,17,25,..., schedule at times 7,15,23,31. |
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58 | ; Now concentrate: there are three nested loops, |
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59 | ; * the innermost loop calculates the total periodic bandwidth scheduled |
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60 | ; in the given millisecond, |
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61 | ; * the intermediate loop calculates the maximum over all milliseconds |
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62 | ; in the given variant, that is the quantity we're trying to minimize, |
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63 | ; * the outermost loop checks all variants. |
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64 | ; 2. Calculate offset between the first list and the first list for the |
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65 | ; selected interval, in bytes; save in the stack for step 4. |
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66 | sub eax, ecx |
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67 | sub eax, ecx |
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68 | imul eax, sizeof.ohci_static_ep |
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69 | push eax |
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70 | imul ebx, ecx, sizeof.ohci_static_ep |
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71 | ; 3. Select the best variant. |
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72 | ; 3a. The outermost loop. |
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73 | ; Prepare for the loop: set the current optimal bandwidth to maximum |
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74 | ; possible value (so that any variant will pass the first comparison), |
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75 | ; calculate delta for the intermediate loop. |
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76 | or [.bandwidth], -1 |
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77 | .varloop: |
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78 | ; 3b. The intermediate loop. |
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79 | ; Prepare for the loop: set the maximum to be calculated to zero, |
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80 | ; save counter of the outermost loop. |
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81 | xor edi, edi |
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82 | push edx |
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83 | virtual at esp |
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84 | .cur_variant dd ? ; step 3b |
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85 | .result_delta dd ? ; step 2 |
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86 | .group1_limit dd ? ; function prolog |
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87 | end virtual |
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88 | .calc_max_bandwidth: |
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89 | ; 3c. The innermost loop. Sum over all lists. |
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90 | xor eax, eax |
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91 | push edx |
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92 | .calc_bandwidth: |
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93 | add eax, [edx+ohci_static_ep.SoftwarePart+usb_static_ep.Bandwidth] |
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94 | mov edx, [edx+ohci_static_ep.NextList] |
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95 | test edx, edx |
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96 | jnz .calc_bandwidth |
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97 | pop edx |
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98 | ; 3d. The intermediate loop continued: update maximum. |
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99 | cmp eax, edi |
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100 | jb @f |
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101 | mov edi, eax |
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102 | @@: |
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103 | ; 3e. The intermediate loop continued: advance counter. |
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104 | add edx, ebx |
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105 | cmp edx, [.group1_limit] |
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106 | jb .calc_max_bandwidth |
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107 | ; 3e. The intermediate loop done: restore counter of the outermost loop. |
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108 | pop edx |
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109 | ; 3f. The outermost loop continued: if the current variant is |
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110 | ; better (maybe not strictly) then the previous optimum, update |
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111 | ; the optimal bandwidth and resulting list. |
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112 | cmp edi, [.bandwidth] |
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113 | ja @f |
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114 | mov [.bandwidth], edi |
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115 | mov [.target], edx |
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116 | @@: |
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117 | ; 3g. The outermost loop continued: advance counter. |
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118 | add edx, sizeof.ohci_static_ep |
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119 | dec ecx |
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120 | jnz .varloop |
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3908 | Serge | 121 | ; 4. Calculate bandwidth for the new pipe. |
122 | mov eax, [.maxpacket] |
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123 | mov cl, [.speed] |
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124 | mov ch, byte [.endpoint] |
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125 | and ch, 80h |
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126 | call calc_usb1_bandwidth |
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127 | ; 5. Get the pointer to the best list. |
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3555 | Serge | 128 | pop edx ; restore value from step 2 |
3908 | Serge | 129 | pop ecx ; purge stack var from prolog |
3555 | Serge | 130 | add edx, [.target] |
3908 | Serge | 131 | ; 6. Check that bandwidth for the new pipe plus old bandwidth |
132 | ; still fits to maximum allowed by the core specification, 90% of 12000 bits. |
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133 | mov ecx, eax |
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134 | add ecx, [.bandwidth] |
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135 | cmp ecx, 10800 |
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136 | ja .no_bandwidth |
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3555 | Serge | 137 | ; 7. Convert {o|u}hci_static_ep to usb_static_ep, update bandwidth and return. |
138 | add edx, ohci_static_ep.SoftwarePart |
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139 | add [edx+usb_static_ep.Bandwidth], eax |
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140 | pop edi ebx ; restore used registers to be stdcall |
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141 | ret |
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3908 | Serge | 142 | .no_bandwidth: |
143 | dbgstr 'Periodic bandwidth limit reached' |
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144 | xor edx, edx |
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145 | pop edi ebx |
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146 | ret |
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3555 | Serge | 147 | endp |
148 | ; sanity check, part 2 |
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149 | else |
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150 | .err select_interrupt_list must be different for UHCI and OHCI |
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151 | end if |
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152 | |||
153 | ; Pipe is removing, update the corresponding lists. |
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154 | ; We do not reorder anything, so just update book-keeping variable |
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155 | ; in the list header. |
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156 | proc usb1_interrupt_list_unlink |
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157 | virtual at esp |
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158 | dd ? ; return address |
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159 | .maxpacket dd ? |
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160 | .lowspeed db ? |
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161 | .direction db ? |
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162 | rb 2 |
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163 | end virtual |
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3908 | Serge | 164 | ; calculate bandwidth on the bus |
165 | mov eax, [.maxpacket] |
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166 | mov ecx, dword [.lowspeed] |
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167 | call calc_usb1_bandwidth |
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3555 | Serge | 168 | ; find list header |
169 | mov edx, ebx |
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170 | @@: |
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171 | mov edx, [edx+usb_pipe.NextVirt] |
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172 | cmp [edx+usb_pipe.Controller], esi |
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3908 | Serge | 173 | jz @b |
3555 | Serge | 174 | ; subtract pipe bandwidth |
175 | sub [edx+usb_static_ep.Bandwidth], eax |
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176 | ret 8 |
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177 | endp |
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178 | |||
3908 | Serge | 179 | ; Helper procedure for USB1 scheduler: calculate bandwidth on the bus. |
180 | ; in: low 11 bits of eax = payload size in bytes |
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181 | ; in: cl = 0 - full-speed, nonzero - high-speed |
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182 | ; in: ch = 0 - OUT, nonzero - IN |
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183 | ; out: eax = maximal bandwidth in FS-bits |
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184 | proc calc_usb1_bandwidth |
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185 | and eax, (1 shl 11) - 1 ; get payload for one transaction |
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186 | add eax, 3 ; add 3 bytes for other fields in data packet, PID+CRC16 |
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187 | test cl, cl |
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188 | jnz .low_speed |
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189 | ; Multiply by 8 for bytes -> bits, by 7/6 to accomodate bit stuffing |
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190 | ; and by 401/400 for IN transfers to accomodate timers difference |
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191 | ; 9+107/300 for IN transfers, 9+1/3 for OUT transfers |
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192 | ; For 0 <= eax < 09249355h, floor(eax * 107/300) = floor(eax * 5B4E81B5h / 2^32). |
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193 | ; For 0 <= eax < 80000000h, floor(eax / 3) = floor(eax * 55555556h / 2^32). |
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194 | mov edx, 55555556h |
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195 | test ch, ch |
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196 | jz @f |
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197 | mov edx, 5B4E81B5h |
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198 | @@: |
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199 | lea ecx, [eax*9] |
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200 | mul edx |
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201 | ; Add 93 extra bits: 39 bits for Token packet (8 for SYNC, 24 for token+address, |
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202 | ; 4 extra bits for possible bit stuffing in token+address, 3 for EOP), |
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203 | ; 18 bits for bus turn-around, 11 bits for SYNC+EOP in Data packet plus 1 bit |
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204 | ; for possible timers difference, 2 bits for inter-packet delay, 20 bits for |
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205 | ; Handshake packet, 2 bits for another inter-packet delay. |
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206 | lea eax, [ecx+edx+93] |
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207 | ret |
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208 | .low_speed: |
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209 | ; Multiply by 8 for bytes -> bits, by 7/6 to accomodate bit stuffing, |
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210 | ; by 8 for LS -> FS and by 406/50 for IN transfers to accomodate timers difference. |
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211 | ; 75+59/75 for IN transfers, 74+2/3 for OUT transfers. |
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212 | mov edx, 0AAAAAABh |
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213 | test ch, ch |
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214 | mov ecx, 74 |
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215 | jz @f |
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216 | mov edx, 0C962FC97h |
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217 | inc ecx |
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218 | @@: |
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219 | imul ecx, eax |
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220 | mul edx |
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221 | ; Add 778 extra bits: |
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222 | ; 16 bits for PRE packet, 4 bits for hub delay, 8*39 bits for Token packet |
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223 | ; 8*18 bits for bus turn-around |
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224 | ; (406/50)*11 bits for SYNC+EOP in Data packet, |
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225 | ; 8*2 bits for inter-packet delay, |
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226 | ; 16 bits for PRE packet, 4 bits for hub delay, 8*20 bits for Handshake packet, |
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227 | ; 8*2 bits for another inter-packet delay. |
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228 | lea eax, [ecx+edx+778] |
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229 | ret |
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230 | endp |
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231 | |||
3555 | Serge | 232 | ; USB2 scheduler. |
233 | ; There are two parts: high-speed pipes and split-transaction pipes. |
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3908 | Serge | 234 | ; |
3555 | Serge | 235 | ; High-speed scheduler uses the same algorithm as USB1 scheduler: |
236 | ; when adding a pipe, optimize the following quantity: |
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237 | ; * for every microframe, take all bandwidth scheduled to periodic transfers, |
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3908 | Serge | 238 | ; * calculate maximum over all microframes, |
3555 | Serge | 239 | ; * select a variant which minimizes that maximum; |
3908 | Serge | 240 | ; * if there are several such variants, |
241 | ; prefer those that are closer to end of frame |
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242 | ; to minimize collisions with split transactions; |
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3555 | Serge | 243 | ; when removing a pipe, do nothing (except for bookkeeping). |
244 | ; in: esi -> usb_controller |
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245 | ; out: edx -> usb_static_ep, eax = S-Mask |
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246 | proc ehci_select_hs_interrupt_list |
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247 | ; inherit some variables from usb_open_pipe |
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248 | virtual at ebp-12 |
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249 | .targetsmask dd ? |
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250 | .bandwidth dd ? |
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251 | .target dd ? |
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252 | dd ? |
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253 | dd ? |
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254 | .config_pipe dd ? |
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255 | .endpoint dd ? |
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256 | .maxpacket dd ? |
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257 | .type dd ? |
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258 | .interval dd ? |
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259 | end virtual |
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260 | ; prolog, initialize local vars |
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261 | or [.bandwidth], -1 |
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262 | or [.target], -1 |
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263 | or [.targetsmask], -1 |
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264 | push ebx edi ; save used registers to be stdcall |
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265 | ; 1. In EHCI, every list describes one millisecond = 8 microframes. |
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266 | ; Thus, there are two significantly different branches: |
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267 | ; for pipes with interval >= 8 microframes, advance to 2, |
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268 | ; for pipes which should be planned in every frame (one or more microframes), |
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269 | ; go to 9. |
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270 | ; Note: the actual interval for high-speed devices is 2^([.interval]-1), |
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271 | ; (the core specification forbids [.interval] == 0) |
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272 | mov ecx, [.interval] |
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273 | dec ecx |
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274 | cmp ecx, 3 |
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275 | jb .every_frame |
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276 | ; 2. Determine the actual interval in milliseconds. |
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277 | sub ecx, 3 |
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278 | cmp ecx, 5 ; maximum 32ms |
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279 | jbe @f |
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3626 | Serge | 280 | movi ecx, 5 |
3555 | Serge | 281 | @@: |
282 | ; There are four nested loops, |
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283 | ; * Loop #4 (the innermost one) calculates the total periodic bandwidth |
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284 | ; scheduled in the given microframe of the given millisecond. |
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285 | ; * Loop #3 calculates the maximum over all milliseconds |
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286 | ; in the given variant, that is the quantity we're trying to minimize. |
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287 | ; * Loops #1 and #2 check all variants; |
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288 | ; loop #1 is responsible for the target millisecond, |
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289 | ; loop #2 is responsible for the microframe within millisecond. |
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290 | ; 3. Prepare for loops. |
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291 | ; ebx = number of iterations of loop #1 |
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292 | ; [esp] = delta of counter for loop #3, in bytes |
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293 | ; [esp+4] = delta between the first group and the target group, in bytes |
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3626 | Serge | 294 | movi ebx, 1 |
295 | movi edx, sizeof.ehci_static_ep |
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3555 | Serge | 296 | shl ebx, cl |
297 | shl edx, cl |
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298 | mov eax, 64*sizeof.ehci_static_ep |
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299 | sub eax, edx |
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300 | sub eax, edx |
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301 | push eax |
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302 | push edx |
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303 | ; 4. Select the best variant. |
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304 | ; 4a. Loop #1: initialize counter = pointer to ehci_static_ep for |
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305 | ; the target millisecond in the first group. |
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306 | lea edx, [esi+ehci_controller.IntEDs-sizeof.ehci_controller] |
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307 | .varloop0: |
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308 | ; 4b. Loop #2: initialize counter = microframe within the target millisecond. |
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309 | xor ecx, ecx |
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310 | .varloop: |
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311 | ; 4c. Loop #3: save counter of loop #1, |
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312 | ; initialize counter with the value of loop #1 counter, |
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313 | ; initialize maximal bandwidth = zero. |
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314 | xor edi, edi |
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315 | push edx |
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316 | virtual at esp |
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317 | .saved_counter1 dd ? ; step 4c |
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318 | .loop3_delta dd ? ; step 3 |
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319 | .target_delta dd ? ; step 3 |
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320 | end virtual |
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321 | .calc_max_bandwidth: |
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322 | ; 4d. Loop #4: initialize counter with the value of loop #3 counter, |
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323 | ; initialize total bandwidth = zero. |
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324 | xor eax, eax |
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325 | push edx |
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326 | .calc_bandwidth: |
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327 | ; 4e. Loop #4: add the bandwidth from the current list |
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328 | ; and advance to the next list, while there is one. |
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329 | add ax, [edx+ehci_static_ep.Bandwidths+ecx*2] |
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330 | mov edx, [edx+ehci_static_ep.NextList] |
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331 | test edx, edx |
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332 | jnz .calc_bandwidth |
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333 | ; 4f. Loop #4 end: restore counter of loop #3. |
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334 | pop edx |
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335 | ; 4g. Loop #3: update maximal bandwidth. |
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336 | cmp eax, edi |
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337 | jb @f |
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338 | mov edi, eax |
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339 | @@: |
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340 | ; 4h. Loop #3: advance the counter and repeat while within the first group. |
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341 | lea eax, [esi+ehci_controller.IntEDs+32*sizeof.ehci_static_ep-sizeof.ehci_controller] |
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342 | add edx, [.loop3_delta] |
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343 | cmp edx, eax |
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344 | jb .calc_max_bandwidth |
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345 | ; 4i. Loop #3 end: restore counter of loop #1. |
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346 | pop edx |
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347 | ; 4j. Loop #2: if the current variant is better (maybe not strictly) |
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348 | ; then the previous optimum, update the optimal bandwidth and the target. |
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349 | cmp edi, [.bandwidth] |
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350 | ja @f |
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3908 | Serge | 351 | jb .update |
352 | cmp ecx, [.targetsmask] |
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353 | jb @f |
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354 | .update: |
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3555 | Serge | 355 | mov [.bandwidth], edi |
356 | mov [.target], edx |
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3908 | Serge | 357 | mov [.targetsmask], ecx |
3555 | Serge | 358 | @@: |
359 | ; 4k. Loop #2: continue 8 times for every microframe. |
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360 | inc ecx |
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361 | cmp ecx, 8 |
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362 | jb .varloop |
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363 | ; 4l. Loop #1: advance counter and repeat ebx times, |
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364 | ; ebx was calculated in step 3. |
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365 | add edx, sizeof.ehci_static_ep |
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366 | dec ebx |
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367 | jnz .varloop0 |
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3908 | Serge | 368 | ; 5. Calculate bandwidth for the new pipe. |
3555 | Serge | 369 | mov eax, [.maxpacket] |
3908 | Serge | 370 | call calc_hs_bandwidth |
371 | mov ecx, [.maxpacket] |
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3555 | Serge | 372 | shr ecx, 11 |
373 | inc ecx |
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374 | and ecx, 3 |
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375 | imul eax, ecx |
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3908 | Serge | 376 | ; 6. Get the pointer to the best list. |
377 | pop edx ; restore value from step 3 |
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378 | pop edx ; get delta calculated in step 3 |
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379 | add edx, [.target] |
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380 | ; 7. Check that bandwidth for the new pipe plus old bandwidth |
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3555 | Serge | 381 | ; still fits to maximum allowed by the core specification |
382 | ; current [.bandwidth] + new bandwidth <= limit; |
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383 | ; USB2 specification allows maximum 60000*80% bit times for periodic microframe |
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3908 | Serge | 384 | mov ecx, [.bandwidth] |
385 | add ecx, eax |
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386 | cmp ecx, 48000 |
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387 | ja .no_bandwidth |
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3555 | Serge | 388 | ; 8. Convert {o|u}hci_static_ep to usb_static_ep, update bandwidth and return. |
389 | mov ecx, [.targetsmask] |
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390 | add [edx+ehci_static_ep.Bandwidths+ecx*2], ax |
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391 | add edx, ehci_static_ep.SoftwarePart |
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3626 | Serge | 392 | movi eax, 1 |
3555 | Serge | 393 | shl eax, cl |
394 | pop edi ebx ; restore used registers to be stdcall |
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395 | ret |
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3908 | Serge | 396 | .no_bandwidth: |
397 | dbgstr 'Periodic bandwidth limit reached' |
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398 | xor eax, eax |
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399 | xor edx, edx |
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400 | pop edi ebx |
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401 | ret |
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3555 | Serge | 402 | .every_frame: |
403 | ; The pipe should be scheduled every frame in two or more microframes. |
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404 | ; 9. Calculate maximal bandwidth for every microframe: three nested loops. |
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405 | ; 9a. The outermost loop: ebx = microframe to calculate. |
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406 | xor ebx, ebx |
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407 | .calc_all_bandwidths: |
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408 | ; 9b. The intermediate loop: |
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409 | ; edx = pointer to ehci_static_ep in the first group, [esp] = counter, |
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410 | ; edi = maximal bandwidth |
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411 | lea edx, [esi+ehci_controller.IntEDs-sizeof.ehci_controller] |
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412 | xor edi, edi |
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413 | push 32 |
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414 | .calc_max_bandwidth2: |
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415 | ; 9c. The innermost loop: calculate bandwidth for the given microframe |
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416 | ; in the given frame. |
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417 | xor eax, eax |
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418 | push edx |
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419 | .calc_bandwidth2: |
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420 | add ax, [edx+ehci_static_ep.Bandwidths+ebx*2] |
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421 | mov edx, [edx+ehci_static_ep.NextList] |
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422 | test edx, edx |
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423 | jnz .calc_bandwidth2 |
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424 | pop edx |
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425 | ; 9d. The intermediate loop continued: update maximal bandwidth. |
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426 | cmp eax, edi |
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427 | jb @f |
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428 | mov edi, eax |
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429 | @@: |
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430 | add edx, sizeof.ehci_static_ep |
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431 | dec dword [esp] |
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432 | jnz .calc_max_bandwidth2 |
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433 | pop eax |
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434 | ; 9e. Push the calculated maximal bandwidth and continue the outermost loop. |
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435 | push edi |
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436 | inc ebx |
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437 | cmp ebx, 8 |
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438 | jb .calc_all_bandwidths |
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439 | virtual at esp |
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440 | .bandwidth7 dd ? |
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441 | .bandwidth6 dd ? |
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442 | .bandwidth5 dd ? |
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443 | .bandwidth4 dd ? |
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444 | .bandwidth3 dd ? |
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445 | .bandwidth2 dd ? |
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446 | .bandwidth1 dd ? |
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447 | .bandwidth0 dd ? |
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448 | end virtual |
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449 | ; 10. Select the best variant. |
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450 | ; edx = S-Mask = bitmask of scheduled microframes |
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3626 | Serge | 451 | movi edx, 0x11 |
3555 | Serge | 452 | cmp ecx, 1 |
453 | ja @f |
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454 | mov dl, 0x55 |
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455 | jz @f |
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456 | mov dl, 0xFF |
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457 | @@: |
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458 | ; try all variants edx, edx shl 1, edx shl 2, ... |
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3908 | Serge | 459 | ; while they fit in the lower byte (8 microframes per frame) |
3555 | Serge | 460 | .select_best_mframe: |
461 | xor edi, edi |
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462 | mov ecx, edx |
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463 | mov eax, esp |
||
464 | .calc_mframe: |
||
465 | add cl, cl |
||
466 | jnc @f |
||
467 | cmp edi, [eax] |
||
468 | jae @f |
||
469 | mov edi, [eax] |
||
470 | @@: |
||
471 | add eax, 4 |
||
472 | test cl, cl |
||
473 | jnz .calc_mframe |
||
474 | cmp [.bandwidth], edi |
||
475 | jb @f |
||
476 | mov [.bandwidth], edi |
||
477 | mov [.targetsmask], edx |
||
478 | @@: |
||
479 | add dl, dl |
||
480 | jnc .select_best_mframe |
||
481 | ; 11. Restore stack after step 9. |
||
482 | add esp, 8*4 |
||
483 | ; 12. Get the pointer to the target list (responsible for every microframe). |
||
484 | lea edx, [esi+ehci_controller.IntEDs.SoftwarePart+62*sizeof.ehci_static_ep-sizeof.ehci_controller] |
||
3908 | Serge | 485 | ; 13. Calculate bandwidth on the bus. |
3555 | Serge | 486 | mov eax, [.maxpacket] |
3908 | Serge | 487 | call calc_hs_bandwidth |
488 | mov ecx, [.maxpacket] |
||
3555 | Serge | 489 | shr ecx, 11 |
490 | inc ecx |
||
491 | and ecx, 3 |
||
492 | imul eax, ecx |
||
3908 | Serge | 493 | ; 14. Check that current [.bandwidth] + new bandwidth <= limit; |
3555 | Serge | 494 | ; USB2 specification allows maximum 60000*80% bit times for periodic microframe. |
3908 | Serge | 495 | mov ecx, [.bandwidth] |
496 | add ecx, eax |
||
497 | cmp ecx, 48000 |
||
498 | ja .no_bandwidth |
||
499 | ; 15. Update bandwidths including the new pipe. |
||
3555 | Serge | 500 | mov ecx, [.targetsmask] |
501 | lea edi, [edx+ehci_static_ep.Bandwidths-ehci_static_ep.SoftwarePart] |
||
502 | .update_bandwidths: |
||
503 | shr ecx, 1 |
||
504 | jnc @f |
||
505 | add [edi], ax |
||
506 | @@: |
||
507 | add edi, 2 |
||
508 | test ecx, ecx |
||
509 | jnz .update_bandwidths |
||
3908 | Serge | 510 | ; 16. Return target list and target S-Mask. |
3555 | Serge | 511 | mov eax, [.targetsmask] |
512 | pop edi ebx ; restore used registers to be stdcall |
||
513 | ret |
||
514 | endp |
||
515 | |||
516 | ; Pipe is removing, update the corresponding lists. |
||
517 | ; We do not reorder anything, so just update book-keeping variable |
||
518 | ; in the list header. |
||
519 | proc ehci_hs_interrupt_list_unlink |
||
3725 | Serge | 520 | movzx eax, word [ebx+ehci_pipe.Token-sizeof.ehci_pipe+2] |
3908 | Serge | 521 | ; calculate bandwidth |
522 | call calc_hs_bandwidth |
||
3725 | Serge | 523 | mov ecx, [ebx+ehci_pipe.Flags-sizeof.ehci_pipe] |
3555 | Serge | 524 | shr ecx, 30 |
525 | imul eax, ecx |
||
3725 | Serge | 526 | movzx ecx, byte [ebx+ehci_pipe.Flags-sizeof.ehci_pipe] |
3908 | Serge | 527 | ; get target list |
528 | mov edx, [ebx+ehci_pipe.BaseList-sizeof.ehci_pipe] |
||
3555 | Serge | 529 | ; update bandwidth |
530 | .dec_bandwidth: |
||
531 | shr ecx, 1 |
||
532 | jnc @f |
||
3908 | Serge | 533 | sub word [edx+ehci_static_ep.Bandwidths - ehci_static_ep.SoftwarePart], ax |
3555 | Serge | 534 | @@: |
535 | add edx, 2 |
||
536 | test ecx, ecx |
||
537 | jnz .dec_bandwidth |
||
538 | ; return |
||
539 | ret |
||
540 | endp |
||
541 | |||
3908 | Serge | 542 | ; Helper procedure for USB2 scheduler: calculate bandwidth on the bus. |
543 | ; in: low 11 bits of eax = payload size in bytes |
||
544 | ; out: eax = maximal bandwidth in HS-bits |
||
545 | proc calc_hs_bandwidth |
||
546 | and eax, (1 shl 11) - 1 ; get payload for one transaction |
||
547 | add eax, 3 ; add 3 bytes for other fields in data packet, PID+CRC16 |
||
548 | ; Multiply by 8 for bytes -> bits and then by 7/6 to accomodate bit stuffing; |
||
549 | ; total 28/3 = 9+1/3 |
||
550 | mov edx, 55555556h |
||
551 | lea ecx, [eax*9] |
||
552 | mul edx |
||
553 | ; Add 989 extra bits: 68 bits for Token packet (32 for SYNC, 24 for token+address, |
||
554 | ; 4 extra bits for possible bit stuffing in token+address, 8 for EOP), |
||
555 | ; 736 bits for bus turn-around, 40 bits for SYNC+EOP in Data packet, |
||
556 | ; 8 bits for inter-packet delay, 49 bits for Handshake packet, |
||
557 | ; 88 bits for another inter-packet delay. |
||
558 | lea eax, [ecx+edx+989] |
||
559 | ret |
||
560 | endp |
||
3555 | Serge | 561 | |
3908 | Serge | 562 | ; Split-transaction scheduler (aka TT scheduler, TT stands for Transaction |
563 | ; Translator, section 11.14 of the core spec) needs to schedule three event |
||
564 | ; types on two buses: Start-Split and Complete-Split on HS bus and normal |
||
565 | ; transaction on FS/LS bus. |
||
566 | ; Assume that FS/LS bus is more restricted and more important to be scheduled |
||
567 | ; uniformly, so select the variant which minimizes maximal used bandwidth |
||
568 | ; on FS/LS bus and does not overflow HS bus. |
||
569 | ; If there are several such variants, prefer variants which is closest to |
||
570 | ; start of frame, and within the same microframe consider HS bandwidth |
||
571 | ; utilization as a last criteria. |
||
572 | |||
573 | ; The procedure ehci_select_tt_interrupt_list has been splitted into several |
||
574 | ; macro, each representing a logical step of the procedure, |
||
575 | ; to simplify understanding what is going on. Consider all the following macro |
||
576 | ; as logical parts of one procedure, they are meaningless outside the context. |
||
577 | |||
578 | ; Given a frame, calculate bandwidth occupied by already opened pipes |
||
579 | ; in every microframe. |
||
580 | ; Look for both HS and FS/LS buses: there are 16 words of information, |
||
581 | ; 8 for HS bus, 8 for FS/LS bus, for every microframe. |
||
582 | ; Since we count already opened pipes, the total bandwidth in every microframe |
||
583 | ; is less than 60000 bits (and even 60000*80% bits), otherwise the scheduler |
||
584 | ; would not allow to open those pipes. |
||
585 | ; edi -> first list for the frame |
||
586 | macro tt_calc_bandwidth_in_frame |
||
587 | { |
||
588 | local .lists, .pipes, .pipes_done, .carry |
||
589 | ; 1. Zero everything. |
||
590 | xor eax, eax |
||
591 | mov edx, edi |
||
592 | repeat 4 |
||
593 | mov dword [.budget+(%-1)*4], eax |
||
594 | end repeat |
||
595 | repeat 4 |
||
596 | mov dword [.hs_bandwidth+(%-1)*4], eax |
||
597 | end repeat |
||
598 | mov [.total_budget], ax |
||
599 | ; Loop over all lists for the given frame. |
||
600 | .lists: |
||
601 | ; 2. Total HS bandwidth for all pipes in one list is kept inside list header, |
||
602 | ; add it. Note that overflow is impossible, so we may add entire dwords. |
||
603 | mov ebx, [edx+ehci_static_ep.SoftwarePart+usb_static_ep.NextVirt] |
||
604 | repeat 4 |
||
605 | mov eax, dword [edx+ehci_static_ep.Bandwidths+(%-1)*4] |
||
606 | add dword [.hs_bandwidth+(%-1)*4], eax |
||
607 | end repeat |
||
608 | ; Loop over all pipes in the given list. |
||
609 | add edx, ehci_static_ep.SoftwarePart |
||
610 | .pipes: |
||
611 | cmp ebx, edx |
||
612 | jz .pipes_done |
||
613 | ; 3. For every pipe in every list for the given frame: |
||
614 | ; 3a. Check whether the pipe resides on the same FS/LS bus as the new pipe. |
||
615 | ; If not, skip this pipe. |
||
616 | mov eax, [ebx+usb_pipe.DeviceData] |
||
617 | mov eax, [eax+usb_device_data.TTHub] |
||
618 | cmp eax, [.tthub] |
||
619 | jnz @f |
||
620 | ; 3b. Calculate FS/LS budget for the opened pipe. |
||
621 | ; Note that eax = TTHub after 3a. |
||
622 | call tt_calc_budget |
||
623 | ; 3c. Update total budget: add the value from 3b |
||
624 | ; to the budget of the first microframe scheduled for this pipe. |
||
625 | bsf ecx, [ebx+ehci_pipe.Flags-sizeof.ehci_pipe] |
||
626 | add [.budget+ecx*2], ax |
||
627 | @@: |
||
628 | mov ebx, [ebx+usb_pipe.NextVirt] |
||
629 | jmp .pipes |
||
630 | .pipes_done: |
||
631 | mov edx, [edx+ehci_static_ep.NextList-ehci_static_ep.SoftwarePart] |
||
632 | test edx, edx |
||
633 | jnz .lists |
||
634 | ; 4. If the budget for some microframe is exceeded, carry it to the following |
||
635 | ; microframe(s). The actual size of one microframe is 187.5 raw bytes; |
||
636 | ; the core spec says that 188 bytes should be scheduled in every microframe. |
||
637 | xor eax, eax |
||
638 | xor ecx, ecx |
||
639 | .carry: |
||
640 | xor edx, edx |
||
641 | add ax, [.budget+ecx*2] |
||
642 | cmp ax, 188 |
||
643 | jbe @f |
||
644 | mov dx, ax |
||
645 | mov ax, 188 |
||
646 | sub dx, ax |
||
647 | @@: |
||
648 | mov [.budget+ecx*2], ax |
||
649 | add [.total_budget], ax |
||
650 | mov ax, dx |
||
651 | inc ecx |
||
652 | cmp ecx, 8 |
||
653 | jb .carry |
||
654 | } |
||
655 | |||
656 | ; Checks whether the new pipe fits in the existing FS budget |
||
657 | ; starting from the given microframe. If not, mark the microframe |
||
658 | ; as impossible for scheduling. |
||
659 | ; in: ecx = microframe |
||
660 | macro tt_exclude_microframe_if_no_budget |
||
661 | { |
||
662 | local .loop, .good, .bad |
||
663 | ; 1. If the new budget plus the current budget does not exceed 188 bytes, |
||
664 | ; the variant is possible. |
||
665 | mov ax, [.budget+ecx*2] |
||
666 | mov edx, ecx |
||
667 | add ax, [.new_budget] |
||
668 | sub ax, 188 |
||
669 | jbe .good |
||
670 | ; 2. Otherwise, |
||
671 | ; a) nothing should be scheduled in some following microframes, |
||
672 | ; b) after adding the new budget everything should fit in first 6 microframes, |
||
673 | ; this guarantees that even in the worst case 90% limit is satisfied. |
||
674 | .loop: |
||
675 | cmp edx, 5 |
||
676 | jae .bad |
||
677 | cmp [.budget+(edx+1)*2], 0 |
||
678 | jnz .bad |
||
679 | inc edx |
||
680 | sub ax, 188 |
||
681 | ja .loop |
||
682 | .bad: |
||
683 | btr [.possible_microframes], ecx |
||
684 | .good: |
||
685 | } |
||
686 | |||
687 | ; Calculate data corresponding to the particular scheduling variant for the new pipe. |
||
688 | ; Data describe the current scheduling state collected over all frames touched |
||
689 | ; by the given variant: maximal HS bandwidth, maximal FS/LS budget, |
||
690 | ; which microframes fit in the current FS/LS budget for all frames. |
||
691 | macro tt_calc_statistics_for_one_variant |
||
692 | { |
||
693 | local .frames, .microframes |
||
694 | ; 1. Initialize: zero maximal bandwidth, |
||
695 | ; first 6 microframes are possible for scheduling. |
||
696 | xor eax, eax |
||
697 | repeat 4 |
||
698 | mov dword [.max_hs_bandwidth+(%-1)*4], eax |
||
699 | end repeat |
||
700 | mov [.max_fs_bandwidth], ax |
||
701 | mov [.possible_microframes], 0x3F |
||
702 | ; Loop over all frames starting with [.variant] advancing by [.variant_delta]. |
||
703 | mov edi, [.variant] |
||
704 | .frames: |
||
705 | ; 2. Calculate statistics for one frame. |
||
706 | tt_calc_bandwidth_in_frame |
||
707 | ; 3. Update maximal FS budget. |
||
708 | mov ax, [.total_budget] |
||
709 | cmp ax, [.max_fs_bandwidth] |
||
710 | jb @f |
||
711 | mov [.max_fs_bandwidth], ax |
||
712 | @@: |
||
713 | ; 4. For every microframe, update maximal HS bandwidth |
||
714 | ; and check whether the microframe is allowed for scheduling. |
||
715 | xor ecx, ecx |
||
716 | .microframes: |
||
717 | mov ax, [.hs_bandwidth+ecx*2] |
||
718 | cmp ax, [.max_hs_bandwidth+ecx*2] |
||
719 | jb @f |
||
720 | mov [.max_hs_bandwidth+ecx*2], ax |
||
721 | @@: |
||
722 | tt_exclude_microframe_if_no_budget |
||
723 | inc ecx |
||
724 | cmp ecx, 8 |
||
725 | jb .microframes |
||
726 | ; Stop loop when outside of first descriptor group. |
||
727 | lea eax, [esi+ehci_controller.IntEDs+32*sizeof.ehci_static_ep-sizeof.ehci_controller] |
||
728 | add edi, [.variant_delta] |
||
729 | cmp edi, eax |
||
730 | jb .frames |
||
731 | } |
||
732 | |||
733 | struct usb_split_info |
||
734 | microframe_mask dd ? ; lower byte is S-mask, second byte is C-mask |
||
735 | ssplit_bandwidth dd ? |
||
736 | csplit_bandwidth dd ? |
||
737 | ends |
||
738 | |||
739 | ; Check whether the current variant and the current microframe are allowed |
||
740 | ; for scheduling. If so, check whether they are better than the previously |
||
741 | ; selected variant+microframe, if any. If so, update the previously selected |
||
742 | ; variant+microframe to current ones. |
||
743 | ; ecx = microframe, [.variant] = variant |
||
744 | macro tt_check_variant_microframe |
||
745 | { |
||
746 | local .nothing, .update, .ssplit, .csplit, .csplit_done |
||
747 | ; 1. If the current microframe does not fit in existing FS budget, do nothing. |
||
748 | bt [.possible_microframes], ecx |
||
749 | jnc .nothing |
||
750 | ; 2. Calculate maximal HS bandwidth over all affected microframes. |
||
751 | ; 2a. Start-split phase: one or more microframes starting with ecx, |
||
752 | ; coded in lower byte of .info.microframe_mask. |
||
753 | xor ebx, ebx |
||
754 | xor edx, edx |
||
755 | .ssplit: |
||
756 | lea eax, [ecx+edx] |
||
757 | movzx eax, [.max_hs_bandwidth+eax*2] |
||
758 | add eax, [.info.ssplit_bandwidth] |
||
759 | cmp ebx, eax |
||
760 | ja @f |
||
761 | mov ebx, eax |
||
762 | @@: |
||
763 | inc edx |
||
764 | bt [.info.microframe_mask], edx |
||
765 | jc .ssplit |
||
766 | ; 2b. Complete-split phase: zero or more microframes starting with |
||
767 | ; ecx+(last start-split microframe)+2, |
||
768 | ; coded in second byte of .info.microframe_mask. |
||
769 | add edx, 8 |
||
770 | .csplit: |
||
771 | inc edx |
||
772 | bt [.info.microframe_mask], edx |
||
773 | jnc .csplit_done |
||
774 | lea eax, [ecx+edx] |
||
775 | cmp eax, 8 |
||
776 | jae .csplit_done |
||
777 | movzx eax, [.max_hs_bandwidth+(eax-8)*2] |
||
778 | add eax, [.info.csplit_bandwidth] |
||
779 | cmp ebx, eax |
||
780 | ja .csplit |
||
781 | mov ebx, eax |
||
782 | jmp .csplit |
||
783 | .csplit_done: |
||
784 | ; 3. Check that current HS bandwidth + new bandwidth <= limit; |
||
785 | ; USB2 specification allows maximum 60000*80% bit times for periodic microframe. |
||
786 | cmp ebx, 48000 |
||
787 | ja .nothing |
||
788 | ; 4. This variant is possible for scheduling. |
||
789 | ; Check whether it is better than the currently selected one. |
||
790 | ; 4a. The primary criteria: FS/LS bandwidth. |
||
791 | mov ax, [.max_fs_bandwidth] |
||
792 | cmp ax, [.best_fs_bandwidth] |
||
793 | ja .nothing |
||
794 | jb .update |
||
795 | ; 4b. The secondary criteria: prefer microframes which are closer to start of frame. |
||
796 | cmp ecx, [.targetsmask] |
||
797 | ja .nothing |
||
798 | jb .update |
||
799 | ; 4c. The last criteria: HS bandwidth. |
||
800 | cmp ebx, [.bandwidth] |
||
801 | ja .nothing |
||
802 | .update: |
||
803 | ; 5. This variant is better than the previously selected. |
||
804 | ; Update the best variant with current data. |
||
805 | mov [.best_fs_bandwidth], ax |
||
806 | mov [.bandwidth], ebx |
||
807 | mov [.targetsmask], ecx |
||
808 | mov eax, [.variant] |
||
809 | mov [.target], eax |
||
810 | .nothing: |
||
811 | } |
||
812 | |||
813 | ; TT scheduler: add new pipe. |
||
814 | ; in: esi -> usb_controller, edi -> usb_pipe |
||
815 | ; out: edx -> usb_static_ep, eax = S-Mask |
||
816 | proc ehci_select_tt_interrupt_list |
||
817 | virtual at ebp-12-.local_vars_size |
||
818 | .local_vars_start: |
||
819 | .info usb_split_info |
||
820 | .new_budget dw ? |
||
821 | .total_budget dw ? |
||
822 | .possible_microframes dd ? |
||
823 | .tthub dd ? |
||
824 | .budget rw 8 |
||
825 | .hs_bandwidth rw 8 |
||
826 | .max_hs_bandwidth rw 8 |
||
827 | .max_fs_bandwidth dw ? |
||
828 | .best_fs_bandwidth dw ? |
||
829 | .variant dd ? |
||
830 | .variant_delta dd ? |
||
831 | .target_delta dd ? |
||
832 | .local_vars_size = $ - .local_vars_start |
||
833 | |||
3555 | Serge | 834 | .targetsmask dd ? |
835 | .bandwidth dd ? |
||
836 | .target dd ? |
||
837 | dd ? |
||
838 | dd ? |
||
839 | .config_pipe dd ? |
||
840 | .endpoint dd ? |
||
841 | .maxpacket dd ? |
||
842 | .type dd ? |
||
843 | .interval dd ? |
||
844 | end virtual |
||
3908 | Serge | 845 | mov eax, [edi+ehci_pipe.Token-sizeof.ehci_pipe] |
846 | shr eax, 16 |
||
847 | and eax, (1 shl 11) - 1 |
||
848 | push ebx edi |
||
849 | ; 1. Compute the real interval. FS/LS devices encode the interval as |
||
850 | ; number of milliseconds. Use the maximal power of two that is not greater than |
||
851 | ; the given interval and EHCI scheduling area = 32 frames. |
||
3555 | Serge | 852 | cmp [.interval], 1 |
853 | adc [.interval], 0 |
||
854 | mov ecx, 64 |
||
3908 | Serge | 855 | mov eax, 64 * sizeof.ehci_static_ep |
3555 | Serge | 856 | @@: |
857 | shr ecx, 1 |
||
858 | cmp [.interval], ecx |
||
859 | jb @b |
||
3908 | Serge | 860 | mov [.interval], ecx |
861 | ; 2. Compute variables for further calculations. |
||
862 | ; 2a. [.variant_delta] is delta between two lists from the first group |
||
863 | ; that correspond to the same variant. |
||
864 | imul ecx, sizeof.ehci_static_ep |
||
865 | mov [.variant_delta], ecx |
||
866 | ; 2b. [.target_delta] is delta between the final answer from the group |
||
867 | ; corresponding to [.interval] and the item from the first group. |
||
3555 | Serge | 868 | sub eax, ecx |
869 | sub eax, ecx |
||
3908 | Serge | 870 | mov [.target_delta], eax |
871 | ; 2c. [.variant] is the first list from the first group that corresponds |
||
872 | ; to the current variant. |
||
873 | lea eax, [esi+ehci_controller.IntEDs-sizeof.ehci_controller] |
||
874 | mov [.variant], eax |
||
875 | ; 2d. [.tthub] identifies TT hub for new pipe, [.new_budget] is FS budget |
||
876 | ; for new pipe. |
||
877 | mov eax, [edi+usb_pipe.DeviceData] |
||
878 | mov eax, [eax+usb_device_data.TTHub] |
||
879 | mov ebx, edi |
||
880 | mov [.tthub], eax |
||
881 | call tt_calc_budget |
||
882 | mov [.new_budget], ax |
||
883 | ; 2e. [.usb_split_info] describes bandwidth used by new pipe on HS bus. |
||
884 | lea edi, [.info] |
||
885 | call tt_fill_split_info |
||
886 | test eax, eax |
||
887 | jz .no_bandwidth |
||
888 | ; 2f. There is no best variant yet, put maximal possible values, |
||
889 | ; so any variant would be better than the "current". |
||
890 | or [.best_fs_bandwidth], -1 |
||
891 | or [.target], -1 |
||
892 | or [.bandwidth], -1 |
||
893 | or [.targetsmask], -1 |
||
894 | ; 3. Loop over all variants, for every variant decide whether it is acceptable, |
||
895 | ; select the best variant from all acceptable variants. |
||
896 | .check_variants: |
||
897 | tt_calc_statistics_for_one_variant |
||
898 | xor ecx, ecx |
||
899 | .check_microframes: |
||
900 | tt_check_variant_microframe |
||
901 | inc ecx |
||
902 | cmp ecx, 6 |
||
903 | jb .check_microframes |
||
904 | add [.variant], sizeof.ehci_static_ep |
||
905 | dec [.interval] |
||
906 | jnz .check_variants |
||
907 | ; 4. If there is no acceptable variants, return error. |
||
908 | mov ecx, [.targetsmask] |
||
909 | mov edx, [.target] |
||
910 | cmp ecx, -1 |
||
911 | jz .no_bandwidth |
||
912 | ; 5. Calculate the answer: edx -> selected list, eax = S-Mask and C-Mask. |
||
913 | mov eax, [.info.microframe_mask] |
||
914 | add edx, [.target_delta] |
||
915 | shl eax, cl |
||
916 | and eax, 0xFFFF |
||
917 | ; 6. Update HS bandwidths in the selected list. |
||
918 | xor ecx, ecx |
||
919 | mov ebx, [.info.ssplit_bandwidth] |
||
920 | .update_ssplit: |
||
921 | bt eax, ecx |
||
922 | jnc @f |
||
923 | add [edx+ehci_static_ep.Bandwidths+ecx*2], bx |
||
924 | @@: |
||
925 | inc ecx |
||
926 | cmp ecx, 8 |
||
927 | jb .update_ssplit |
||
928 | mov ebx, [.info.csplit_bandwidth] |
||
929 | .update_csplit: |
||
930 | bt eax, ecx |
||
931 | jnc @f |
||
932 | add [edx+ehci_static_ep.Bandwidths+(ecx-8)*2], bx |
||
933 | @@: |
||
934 | inc ecx |
||
935 | cmp ecx, 16 |
||
936 | jb .update_csplit |
||
937 | ; 7. Return. |
||
938 | add edx, ehci_static_ep.SoftwarePart |
||
939 | pop edi ebx |
||
3555 | Serge | 940 | ret |
3908 | Serge | 941 | .no_bandwidth: |
942 | dbgstr 'Periodic bandwidth limit reached' |
||
943 | xor eax, eax |
||
944 | xor edx, edx |
||
945 | pop edi ebx |
||
946 | ret |
||
3555 | Serge | 947 | endp |
948 | |||
3908 | Serge | 949 | ; Pipe is removing, update the corresponding lists. |
950 | ; We do not reorder anything, so just update book-keeping variable |
||
951 | ; in the list header. |
||
3555 | Serge | 952 | proc ehci_fs_interrupt_list_unlink |
3908 | Serge | 953 | ; calculate bandwidth |
954 | push edi |
||
955 | sub esp, sizeof.usb_split_info |
||
956 | mov edi, esp |
||
957 | call tt_fill_split_info |
||
958 | ; get target list |
||
959 | mov edx, [ebx+ehci_pipe.BaseList-sizeof.ehci_pipe] |
||
960 | ; update bandwidth for Start-Split |
||
961 | mov eax, [edi+usb_split_info.ssplit_bandwidth] |
||
962 | xor ecx, ecx |
||
963 | .dec_bandwidth_1: |
||
964 | bt [ebx+ehci_pipe.Flags-sizeof.ehci_pipe], ecx |
||
965 | jnc @f |
||
966 | sub word [edx+ecx*2+ehci_static_ep.Bandwidths - ehci_static_ep.SoftwarePart], ax |
||
967 | @@: |
||
968 | inc ecx |
||
969 | cmp ecx, 8 |
||
970 | jb .dec_bandwidth_1 |
||
971 | ; update bandwidth for Complete-Split |
||
972 | mov eax, [edi+usb_split_info.csplit_bandwidth] |
||
973 | .dec_bandwidth_2: |
||
974 | bt [ebx+ehci_pipe.Flags-sizeof.ehci_pipe], ecx |
||
975 | jnc @f |
||
976 | sub word [edx+(ecx-8)*2+ehci_static_ep.Bandwidths - ehci_static_ep.SoftwarePart], ax |
||
977 | @@: |
||
978 | inc ecx |
||
979 | cmp ecx, 16 |
||
980 | jb .dec_bandwidth_2 |
||
981 | add esp, sizeof.usb_split_info |
||
982 | pop edi |
||
3555 | Serge | 983 | ret |
984 | endp |
||
3908 | Serge | 985 | |
986 | ; Helper procedure for ehci_select_tt_interrupt_list. |
||
987 | ; Calculates "best-case budget" according to the core spec, |
||
988 | ; that is, number of bytes (not bits) corresponding to "optimistic" transaction |
||
989 | ; time, including inter-packet delays/bus turn-around time, |
||
990 | ; but without bit stuffing and timers drift. |
||
991 | ; One extra TT-specific delay is added: TT think time from the hub descriptor. |
||
992 | ; Similar to calc_usb1_bandwidth with corresponding changes. |
||
993 | ; eax -> usb_hub with TT, ebx -> usb_pipe |
||
994 | proc tt_calc_budget |
||
995 | movzx ecx, [eax+usb_hub.HubCharacteristics] |
||
996 | shr ecx, 5 |
||
997 | and ecx, 3 ; 1+ecx = TT think time in FS-bytes |
||
998 | mov eax, [ebx+ehci_pipe.Token-sizeof.ehci_pipe] |
||
999 | shr eax, 16 |
||
1000 | and eax, (1 shl 11) - 1 ; get data length |
||
1001 | bt [ebx+ehci_pipe.Token-sizeof.ehci_pipe], 12 |
||
1002 | jc .low_speed |
||
1003 | ; Full-speed interrupt IN/OUT: |
||
1004 | ; 33 bits for Token packet (8 for SYNC, 24 for token+address, 3 for EOP), |
||
1005 | ; 18 bits for bus turn-around, 11 bits for SYNC+EOP in Data packet, |
||
1006 | ; 2 bits for inter-packet delay, 19 bits for Handshake packet, |
||
1007 | ; 2 bits for another inter-packet delay. 85 bits total, pad to 11 bytes. |
||
1008 | lea eax, [eax+11+ecx+1] |
||
1009 | ; 1 byte is minimal TT think time in addition to ecx. |
||
1010 | ret |
||
1011 | .low_speed: |
||
1012 | ; Low-speed interrupt IN/OUT: |
||
1013 | ; multiply by 8 for LS -> FS, |
||
1014 | ; add 85 bytes as in full-speed interrupt and extra 5 bytes for two PRE packets |
||
1015 | ; and two hub delays. |
||
1016 | ; 1 byte is minimal TT think time in addition to ecx. |
||
1017 | lea eax, [eax*8+90+ecx+1] |
||
1018 | ret |
||
1019 | endp |
||
1020 | |||
1021 | ; Helper procedure for TT scheduler. |
||
1022 | ; Calculates Start-Split/Complete-Split masks and HS bandwidths. |
||
1023 | ; ebx -> usb_pipe, edi -> usb_split_info |
||
1024 | proc tt_fill_split_info |
||
1025 | ; Interrupt endpoints. |
||
1026 | ; The core spec says in 5.7.3 "Interrupt Transfer Packet Size Constraints" that: |
||
1027 | ; The maximum allowable interrupt data payload size is 64 bytes or less for full-speed. |
||
1028 | ; Low-speed devices are limited to eight bytes or less maximum data payload size. |
||
1029 | ; This is important for scheduling, it guarantees that in any case transaction fits |
||
1030 | ; in two microframes (usually one, two if transaction has started too late in the first |
||
1031 | ; microframe), so check it. |
||
1032 | mov eax, [ebx+ehci_pipe.Token-sizeof.ehci_pipe] |
||
1033 | mov ecx, 8 |
||
1034 | bt eax, 12 |
||
1035 | jc @f |
||
1036 | mov ecx, 64 |
||
1037 | @@: |
||
1038 | shr eax, 16 |
||
1039 | and eax, (1 shl 11) - 1 ; get data length |
||
1040 | cmp eax, ecx |
||
1041 | ja .error |
||
1042 | add eax, 3 ; add 3 bytes for other fields in data packet, PID+CRC16 |
||
1043 | ; Multiply by 8 for bytes -> bits and then by 7/6 to accomodate bit stuffing; |
||
1044 | ; total 28/3 = 9+1/3 |
||
1045 | mov edx, 55555556h |
||
1046 | lea ecx, [eax*9] |
||
1047 | mul edx |
||
1048 | ; One start-split, three complete-splits (unless the last is too far, |
||
1049 | ; but this is handled by the caller). |
||
1050 | mov eax, [ebx+usb_pipe.LastTD] |
||
1051 | mov [edi+usb_split_info.microframe_mask], 0x1C01 |
||
1052 | ; Structure and HS bandwidth of packets depends on the direction. |
||
1053 | bt [eax+ehci_gtd.Token-sizeof.ehci_gtd], 8 |
||
1054 | jc .interrupt_in |
||
1055 | .interrupt_out: |
||
1056 | ; Start-Split phase: |
||
1057 | ; 77 bits for SPLIT packet (32 for SYNC, 8 for EOP, 32 for data, 5 for bit stuffing), |
||
1058 | ; 88 bits for inter-packet delay, 68 bits for Token packet, |
||
1059 | ; 88 bits for inter-packet delay, 40 bits for SYNC+EOP in Data packet, |
||
1060 | ; 88 bits for last inter-packet delay, total 449 bits. |
||
1061 | lea eax, [edx+ecx+449] |
||
1062 | mov [edi+usb_split_info.ssplit_bandwidth], eax |
||
1063 | ; Complete-Split phase: |
||
1064 | ; 77 bits for SPLIT packet, |
||
1065 | ; 88 bits for inter-packet delay, 68 bits for Token packet, |
||
1066 | ; 736 bits for bus turn-around, 49 bits for Handshake packet, |
||
1067 | ; 8 bits for inter-packet delay, total 1026 bits. |
||
1068 | mov [edi+usb_split_info.csplit_bandwidth], 1026 |
||
1069 | ret |
||
1070 | .interrupt_in: |
||
1071 | ; Start-Split phase: |
||
1072 | ; 77 bits for SPLIT packet, 88 bits for inter-packet delay, |
||
1073 | ; 68 bits for Token packet, 88 bits for another inter-packet delay, |
||
1074 | ; total 321 bits. |
||
1075 | mov [edi+usb_split_info.ssplit_bandwidth], 321 |
||
1076 | ; Complete-Split phase: |
||
1077 | ; 77 bits for SPLIT packet, 88 bits for inter-packet delay, |
||
1078 | ; 68 bits for Token packet, 736 bits for bus turn-around, |
||
1079 | ; 40 bits for SYNC+EOP in Data packet, 8 bits for inter-packet delay, |
||
1080 | ; total 1017 bits. |
||
1081 | lea eax, [edx+ecx+1017] |
||
1082 | mov [edi+usb_split_info.csplit_bandwidth], eax |
||
1083 | ret |
||
1084 | .error: |
||
1085 | xor eax, eax |
||
1086 | ret |
||
1087 | endp=>=>=>>=>>=> |