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Rev | Author | Line No. | Line |
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129 | mikedld | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; IRQ0 HANDLER (TIMER INTERRUPT) ;; |
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3 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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4 | |||
5 | |||
6 | align 32 |
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7 | irq0: |
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8 | save_ring3_context |
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9 | mov ax, os_data |
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10 | mov ds, ax |
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11 | mov es, ax |
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12 | |||
13 | inc dword [timer_ticks] |
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14 | |||
15 | mov eax, [timer_ticks] |
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16 | call playNote ; <<<--- Speaker driver |
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17 | |||
18 | cmp eax,[next_usage_update] |
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19 | jb .nocounter |
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20 | add eax,100 |
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21 | mov [next_usage_update],eax |
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22 | call updatecputimes |
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23 | .nocounter: |
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24 | |||
384 | mikedld | 25 | cmp [DONT_SWITCH], byte 1 |
129 | mikedld | 26 | jne .change_task |
27 | |||
28 | mov al,0x20 ; send End Of Interrupt signal |
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29 | mov dx,0x20 |
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30 | out dx,al |
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31 | |||
384 | mikedld | 32 | mov [DONT_SWITCH], byte 0 |
129 | mikedld | 33 | |
34 | restore_ring3_context |
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35 | iret |
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36 | |||
37 | .change_task: |
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38 | call update_counters |
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39 | |||
40 | call find_next_task |
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41 | mov ecx, eax |
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42 | |||
43 | mov al,0x20 ; send End Of Interrupt signal |
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44 | mov dx,0x20 |
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45 | out dx,al |
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46 | |||
47 | test ecx, ecx ; if there is only one running process |
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48 | jnz .return |
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49 | |||
50 | call do_change_task |
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384 | mikedld | 51 | |
129 | mikedld | 52 | .return: |
53 | restore_ring3_context |
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54 | iret |
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55 | |||
56 | |||
57 | align 4 |
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58 | change_task: |
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59 | |||
60 | pushfd |
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61 | cli |
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62 | pushad |
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63 | |||
64 | call update_counters |
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384 | mikedld | 65 | ; \begin{Mario79} |
66 | cmp [dma_task_switched], 1 |
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67 | jne .find_next_task |
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68 | mov [dma_task_switched], 0 |
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69 | mov ebx, [dma_process] |
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70 | cmp [CURRENT_TASK], ebx |
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71 | je .return |
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72 | mov edi, [dma_slot_ptr] |
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73 | mov [CURRENT_TASK], ebx |
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74 | mov [TASK_BASE], edi |
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75 | jmp @f |
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76 | .find_next_task: |
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77 | ; \end{Mario79} |
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129 | mikedld | 78 | call find_next_task |
79 | test eax, eax ; the same task -> skip switch |
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80 | jnz .return |
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384 | mikedld | 81 | @@: |
82 | mov [DONT_SWITCH],byte 1 |
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129 | mikedld | 83 | call do_change_task |
84 | |||
85 | .return: |
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86 | popad |
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87 | popfd |
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88 | |||
89 | ret |
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90 | |||
91 | |||
92 | uglobal |
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93 | align 4 |
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94 | far_jump: |
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95 | .offs dd ? |
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96 | .sel dw ? |
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97 | context_counter dd ? ;noname & halyavin |
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98 | next_usage_update dd ? |
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99 | timer_ticks dd ? |
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100 | prev_slot dd ? |
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101 | event_sched dd ? |
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102 | endg |
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103 | |||
104 | |||
105 | update_counters: |
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384 | mikedld | 106 | mov edi, [TASK_BASE] |
129 | mikedld | 107 | mov ebx, [edi+TASKDATA.counter_add] ; time stamp counter add |
108 | call _rdtsc |
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109 | sub eax, ebx |
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110 | add eax, [edi+TASKDATA.counter_sum] ; counter sum |
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111 | mov [edi+TASKDATA.counter_sum], eax |
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112 | ret |
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113 | |||
114 | |||
115 | ; Find next task to execute |
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116 | ; result: ebx = number of the selected task |
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117 | ; eax = 1 if the task is the same |
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118 | ; edi = address of the data for the task in ebx |
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119 | ; [0x3000] = ebx and [0x3010] = edi |
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120 | ; corrupts other regs |
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121 | find_next_task: |
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384 | mikedld | 122 | mov ebx, [CURRENT_TASK] |
123 | mov edi, [TASK_BASE] |
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129 | mikedld | 124 | mov [prev_slot], ebx |
125 | |||
126 | .waiting_for_termination: |
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127 | .waiting_for_reuse: |
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128 | .waiting_for_event: |
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129 | .suspended: |
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384 | mikedld | 130 | cmp ebx, [TASK_COUNT] |
129 | mikedld | 131 | jb @f |
384 | mikedld | 132 | mov edi, CURRENT_TASK |
129 | mikedld | 133 | xor ebx, ebx |
134 | @@: |
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135 | |||
136 | add edi,0x20 |
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137 | inc ebx |
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138 | |||
139 | mov al, byte [edi+TASKDATA.state] |
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140 | test al, al |
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141 | jz .found |
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142 | cmp al, 1 |
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143 | jz .suspended |
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144 | cmp al, 2 |
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145 | jz .suspended |
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146 | cmp al, 3 |
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147 | je .waiting_for_termination |
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148 | cmp al, 4 |
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149 | je .waiting_for_termination |
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150 | cmp al, 9 |
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151 | je .waiting_for_reuse |
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152 | |||
384 | mikedld | 153 | mov [CURRENT_TASK],ebx |
154 | mov [TASK_BASE],edi |
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129 | mikedld | 155 | |
156 | cmp al, 5 |
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157 | jne .noevents |
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158 | call get_event_for_app |
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159 | test eax, eax |
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160 | jz .waiting_for_event |
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161 | mov [event_sched], eax |
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162 | mov [edi+TASKDATA.state], byte 0 |
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163 | .noevents: |
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164 | .found: |
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384 | mikedld | 165 | mov [CURRENT_TASK],ebx |
166 | mov [TASK_BASE],edi |
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129 | mikedld | 167 | call _rdtsc |
168 | mov [edi+TASKDATA.counter_add],eax |
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169 | |||
170 | xor eax, eax |
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171 | cmp ebx, [prev_slot] |
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172 | sete al |
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173 | ret |
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174 | |||
175 | ; in: ebx = TSS selector index |
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176 | do_change_task: |
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177 | shl ebx, 3 |
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178 | xor eax, eax |
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179 | add ebx, tss0 |
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180 | mov [far_jump.sel], bx ; selector |
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181 | mov [far_jump.offs], eax ; offset |
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182 | jmp pword [far_jump] |
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183 | inc [context_counter] ;noname & halyavin |
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184 | ret |
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185 | |||
186 | |||
187 | |||
188 | align 4 |
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189 | updatecputimes: |
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190 | |||
191 | mov eax,[idleuse] |
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192 | mov [idleusesec],eax |
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193 | mov [idleuse],dword 0 |
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384 | mikedld | 194 | mov ecx, [TASK_COUNT] |
195 | mov edi, TASK_DATA |
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129 | mikedld | 196 | .newupdate: |
197 | mov ebx,[edi+TASKDATA.counter_sum] |
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198 | mov [edi+TASKDATA.cpu_usage],ebx |
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199 | mov [edi+TASKDATA.counter_sum],dword 0 |
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200 | add edi,0x20 |
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201 | dec ecx |
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202 | jnz .newupdate |
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203 | |||
204 | ret---><---><<---> |