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Rev | Author | Line No. | Line |
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1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; IRQ0 HANDLER (TIMER INTERRUPT) ;; |
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3 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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4 | |||
101 | poddubny | 5 | |
1 | ha | 6 | align 32 |
7 | irq0: |
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420 | serge | 8 | pushfd |
9 | pushad |
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10 | mov ax, app_data ; |
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11 | mov ds, ax |
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12 | mov es, ax |
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1 | ha | 13 | |
14 | inc dword [timer_ticks] |
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15 | |||
16 | mov eax, [timer_ticks] |
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22 | poddubny | 17 | call playNote ; <<<--- Speaker driver |
18 | |||
1 | ha | 19 | cmp eax,[next_usage_update] |
20 | jb .nocounter |
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21 | add eax,100 |
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22 | mov [next_usage_update],eax |
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23 | call updatecputimes |
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420 | serge | 24 | .nocounter: |
381 | serge | 25 | cmp [DONT_SWITCH], byte 1 |
101 | poddubny | 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 | |||
381 | serge | 32 | mov [DONT_SWITCH], byte 0 |
101 | poddubny | 33 | |
420 | serge | 34 | popad |
35 | popfd |
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36 | iretd |
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101 | poddubny | 37 | |
420 | serge | 38 | .change_task: |
101 | poddubny | 39 | call update_counters |
40 | |||
41 | call find_next_task |
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42 | mov ecx, eax |
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43 | |||
44 | mov al,0x20 ; send End Of Interrupt signal |
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45 | mov dx,0x20 |
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46 | out dx,al |
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47 | |||
48 | test ecx, ecx ; if there is only one running process |
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49 | jnz .return |
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50 | |||
51 | call do_change_task |
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379 | serge | 52 | |
420 | serge | 53 | .return: |
54 | popad |
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55 | popfd |
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56 | iretd |
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101 | poddubny | 57 | |
58 | |||
59 | align 4 |
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60 | change_task: |
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61 | |||
62 | pushfd |
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63 | cli |
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64 | pushad |
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65 | |||
66 | call update_counters |
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421 | serge | 67 | |
68 | if 0 |
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69 | |||
187 | diamond | 70 | ; \begin{Mario79} |
71 | cmp [dma_task_switched], 1 |
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72 | jne .find_next_task |
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73 | mov [dma_task_switched], 0 |
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74 | mov ebx, [dma_process] |
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379 | serge | 75 | cmp [CURRENT_TASK], ebx |
187 | diamond | 76 | je .return |
77 | mov edi, [dma_slot_ptr] |
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379 | serge | 78 | mov [CURRENT_TASK], ebx |
79 | mov [TASK_BASE], edi |
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187 | diamond | 80 | jmp @f |
81 | .find_next_task: |
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82 | ; \end{Mario79} |
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421 | serge | 83 | |
84 | end if |
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85 | |||
101 | poddubny | 86 | call find_next_task |
87 | test eax, eax ; the same task -> skip switch |
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88 | jnz .return |
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187 | diamond | 89 | @@: |
381 | serge | 90 | mov [DONT_SWITCH],byte 1 |
101 | poddubny | 91 | call do_change_task |
92 | |||
420 | serge | 93 | .return: |
101 | poddubny | 94 | popad |
95 | popfd |
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96 | ret |
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97 | |||
98 | |||
99 | uglobal |
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100 | align 4 |
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101 | far_jump: |
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102 | .offs dd ? |
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103 | .sel dw ? |
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104 | context_counter dd ? ;noname & halyavin |
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105 | next_usage_update dd ? |
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106 | timer_ticks dd ? |
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107 | prev_slot dd ? |
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108 | event_sched dd ? |
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109 | endg |
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110 | |||
111 | |||
112 | update_counters: |
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379 | serge | 113 | mov edi, [TASK_BASE] |
115 | poddubny | 114 | mov ebx, [edi+TASKDATA.counter_add] ; time stamp counter add |
420 | serge | 115 | rdtsc |
1 | ha | 116 | sub eax, ebx |
115 | poddubny | 117 | add eax, [edi+TASKDATA.counter_sum] ; counter sum |
118 | mov [edi+TASKDATA.counter_sum], eax |
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101 | poddubny | 119 | ret |
1 | ha | 120 | |
101 | poddubny | 121 | |
122 | ; Find next task to execute |
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123 | ; result: ebx = number of the selected task |
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102 | poddubny | 124 | ; eax = 1 if the task is the same |
125 | ; edi = address of the data for the task in ebx |
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126 | ; [0x3000] = ebx and [0x3010] = edi |
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127 | ; corrupts other regs |
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101 | poddubny | 128 | find_next_task: |
379 | serge | 129 | mov ebx, [CURRENT_TASK] |
130 | mov edi, [TASK_BASE] |
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21 | poddubny | 131 | mov [prev_slot], ebx |
1 | ha | 132 | |
420 | serge | 133 | .waiting_for_termination: |
134 | .waiting_for_reuse: |
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135 | .waiting_for_event: |
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136 | .suspended: |
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379 | serge | 137 | cmp ebx, [TASK_COUNT] |
21 | poddubny | 138 | jb @f |
379 | serge | 139 | mov edi, CURRENT_TASK |
21 | poddubny | 140 | xor ebx, ebx |
141 | @@: |
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142 | |||
1 | ha | 143 | add edi,0x20 |
144 | inc ebx |
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145 | |||
115 | poddubny | 146 | mov al, byte [edi+TASKDATA.state] |
101 | poddubny | 147 | test al, al |
148 | jz .found |
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40 | halyavin | 149 | cmp al, 1 |
150 | jz .suspended |
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151 | cmp al, 2 |
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152 | jz .suspended |
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1 | ha | 153 | cmp al, 3 |
154 | je .waiting_for_termination |
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155 | cmp al, 4 |
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156 | je .waiting_for_termination |
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157 | cmp al, 9 |
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158 | je .waiting_for_reuse |
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159 | |||
379 | serge | 160 | mov [CURRENT_TASK],ebx |
161 | mov [TASK_BASE],edi |
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1 | ha | 162 | |
21 | poddubny | 163 | cmp al, 5 |
164 | jne .noevents |
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165 | call get_event_for_app |
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166 | test eax, eax |
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167 | jz .waiting_for_event |
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168 | mov [event_sched], eax |
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115 | poddubny | 169 | mov [edi+TASKDATA.state], byte 0 |
420 | serge | 170 | .noevents: |
171 | .found: |
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379 | serge | 172 | mov [CURRENT_TASK],ebx |
173 | mov [TASK_BASE],edi |
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420 | serge | 174 | rdtsc ;call _rdtsc |
115 | poddubny | 175 | mov [edi+TASKDATA.counter_add],eax |
1 | ha | 176 | |
420 | serge | 177 | mov esi, [prev_slot] |
101 | poddubny | 178 | xor eax, eax |
420 | serge | 179 | cmp ebx, esi |
101 | poddubny | 180 | sete al |
181 | ret |
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182 | |||
183 | ; in: ebx = TSS selector index |
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420 | serge | 184 | ; |
185 | ; param |
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186 | ; ebx = incoming task |
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187 | ; esi = outcomig task |
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188 | |||
101 | poddubny | 189 | do_change_task: |
420 | serge | 190 | |
191 | shl ebx, 8 |
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192 | add ebx, SLOT_BASE |
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193 | mov [current_slot], ebx |
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194 | shl esi, 8 |
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195 | add esi, SLOT_BASE |
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196 | |||
197 | mov [esi+APPDATA.saved_esp], esp |
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198 | mov esp, [ebx+APPDATA.saved_esp] |
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199 | |||
200 | mov eax, [ebx+APPDATA.dir_table] |
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201 | mov cr3, eax |
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202 | |||
203 | mov ebx, [ebx+APPDATA.pl0_stack] |
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204 | add ebx, RING0_STACK_SIZE |
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205 | mov [tss_data+TSS._esp0], ebx |
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206 | mov ecx, cr0 |
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207 | or ecx, CR0_TS ;set task switch flag |
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208 | mov cr0, ecx |
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9 | halyavin | 209 | inc [context_counter] ;noname & halyavin |
1 | ha | 210 | |
420 | serge | 211 | ret |
8 | poddubny | 212 | |
420 | serge | 213 | ; |
214 | ; shl ebx, 3 |
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215 | ; xor eax, eax |
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216 | ; add ebx, tss0 |
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217 | ; mov [far_jump.sel], bx ; selector |
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218 | ; mov [far_jump.offs], eax ; offset |
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219 | ; jmp pword [far_jump] |
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220 | ; inc [context_counter] ;noname & halyavin |
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221 | ;ret |
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1 | ha | 222 | |
223 | align 4 |
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224 | updatecputimes: |
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225 | |||
226 | mov eax,[idleuse] |
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227 | mov [idleusesec],eax |
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228 | mov [idleuse],dword 0 |
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379 | serge | 229 | mov ecx, [TASK_COUNT] |
230 | mov edi, TASK_DATA |
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420 | serge | 231 | .newupdate: |
115 | poddubny | 232 | mov ebx,[edi+TASKDATA.counter_sum] |
233 | mov [edi+TASKDATA.cpu_usage],ebx |
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234 | mov [edi+TASKDATA.counter_sum],dword 0 |
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1 | ha | 235 | add edi,0x20 |
236 | dec ecx |
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237 | jnz .newupdate |
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238 | |||
239 | ret---><---><<---> |