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Rev | Author | Line No. | Line |
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2288 | clevermous | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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5363 | yogev_ezra | 3 | ;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;; |
2288 | clevermous | 4 | ;; Copyright (C) MenuetOS 2000-2004 Ville Mikael Turjanmaa ;; |
5 | ;; Distributed under terms of the GNU General Public License ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | $Revision: 5788 $ |
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9 | |||
10 | |||
11 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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12 | ;; IRQ0 HANDLER (TIMER INTERRUPT) ;; |
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13 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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14 | |||
15 | |||
16 | align 32 |
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17 | irq0: |
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18 | pushad |
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5788 | serge | 19 | mov ax, app_data |
20 | mov ds, ax |
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2288 | clevermous | 21 | mov es, ax |
22 | inc [timer_ticks] |
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23 | mov eax, [timer_ticks] |
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24 | call playNote ; <<<--- Speaker driver |
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25 | sub eax, [next_usage_update] |
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26 | cmp eax, 100 |
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27 | jb .nocounter |
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28 | add [next_usage_update], 100 |
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29 | call updatecputimes |
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30 | .nocounter: |
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31 | xor ecx, ecx ; send End Of Interrupt signal |
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32 | call irq_eoi |
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4700 | mario79 | 33 | |
3615 | clevermous | 34 | mov bl, SCHEDULE_ANY_PRIORITY |
2288 | clevermous | 35 | call find_next_task |
36 | jz .return ; if there is only one running process |
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37 | call do_change_task |
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38 | .return: |
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39 | popad |
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40 | iretd |
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41 | |||
42 | align 4 |
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43 | change_task: |
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44 | pushfd |
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45 | cli |
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46 | pushad |
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3615 | clevermous | 47 | mov bl, SCHEDULE_ANY_PRIORITY |
2288 | clevermous | 48 | call find_next_task |
49 | jz .return ; the same task -> skip switch |
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4700 | mario79 | 50 | |
2288 | clevermous | 51 | call do_change_task |
52 | .return: |
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53 | popad |
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54 | popfd |
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55 | ret |
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56 | |||
57 | uglobal |
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58 | align 4 |
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59 | ; far_jump: |
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60 | ; .offs dd ? |
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61 | ; .sel dw ? |
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62 | context_counter dd 0 ;noname & halyavin |
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63 | next_usage_update dd 0 |
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64 | timer_ticks dd 0 |
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65 | ; prev_slot dd ? |
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66 | ; event_sched dd ? |
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67 | endg |
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68 | |||
69 | align 4 |
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70 | update_counters: |
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71 | mov edi, [TASK_BASE] |
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72 | rdtsc |
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73 | sub eax, [edi+TASKDATA.counter_add] ; time stamp counter add |
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74 | add [edi+TASKDATA.counter_sum], eax ; counter sum |
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75 | ret |
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76 | align 4 |
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77 | updatecputimes: |
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78 | mov ecx, [TASK_COUNT] |
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79 | mov edi, TASK_DATA |
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80 | .newupdate: |
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81 | xor eax, eax |
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82 | xchg eax, [edi+TASKDATA.counter_sum] |
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83 | mov [edi+TASKDATA.cpu_usage], eax |
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84 | add edi, 0x20 |
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85 | loop .newupdate |
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86 | ret |
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87 | |||
3539 | clevermous | 88 | ;TODO: Надо бы убрать использование do_change_task из V86... |
89 | ; и после этого перенести обработку TASKDATA.counter_add/sum в do_change_task |
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2288 | clevermous | 90 | |
91 | align 4 |
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92 | do_change_task: |
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93 | ;param: |
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94 | ; ebx = address of the APPDATA for incoming task (new) |
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95 | ;warning: |
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96 | ; [CURRENT_TASK] and [TASK_BASE] must be changed before (e.g. in find_next_task) |
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97 | ; [current_slot] is the outcoming (old), and set here to a new value (ebx) |
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98 | ;scratched: eax,ecx,esi |
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99 | mov esi, ebx |
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100 | xchg esi, [current_slot] |
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101 | ; set new stack after saving old |
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102 | mov [esi+APPDATA.saved_esp], esp |
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103 | mov esp, [ebx+APPDATA.saved_esp] |
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104 | ; set new thread io-map |
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5788 | serge | 105 | mov eax, [ebx+APPDATA.io_map] |
106 | mov dword [page_tabs+((tss._io_map_0 and -4096) shr 10)], eax |
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107 | mov eax, [ebx+APPDATA.io_map+4] |
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108 | mov dword [page_tabs+((tss._io_map_1 and -4096) shr 10)], eax |
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2288 | clevermous | 109 | ; set new thread memory-map |
5130 | serge | 110 | mov eax, [ebx+APPDATA.process] |
111 | cmp eax, [current_process] |
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2288 | clevermous | 112 | je @f |
5130 | serge | 113 | mov [current_process], eax |
114 | mov eax, [eax+PROC.pdt_0_phys] |
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2288 | clevermous | 115 | mov cr3, eax |
116 | @@: |
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117 | ; set tss.esp0 |
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118 | |||
5788 | serge | 119 | mov eax, [ebx+APPDATA.saved_esp0] |
120 | mov [tss._esp0], eax |
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2288 | clevermous | 121 | |
122 | mov edx, [ebx+APPDATA.tls_base] |
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123 | |||
124 | mov [tls_data_l+2], dx |
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125 | shr edx, 16 |
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126 | mov [tls_data_l+4], dl |
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127 | mov [tls_data_l+7], dh |
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128 | |||
129 | mov dx, app_tls |
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130 | mov fs, dx |
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5376 | serge | 131 | |
2288 | clevermous | 132 | ; set gs selector unconditionally |
5788 | serge | 133 | Mov ax, graph_data |
134 | Mov gs, ax |
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2288 | clevermous | 135 | ; set CR0.TS |
136 | cmp bh, byte[fpu_owner] ;bh == incoming task (new) |
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137 | clts ;clear a task switch flag |
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138 | je @f |
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139 | mov eax, cr0 ;and set it again if the owner |
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140 | or eax, CR0_TS ;of a fpu has changed |
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141 | mov cr0, eax |
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142 | @@: ; set context_counter (only for user pleasure ???) |
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143 | inc [context_counter] ;noname & halyavin |
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144 | ; set debug-registers, if it's necessary |
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145 | test byte[ebx+APPDATA.dbg_state], 1 |
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146 | jz @f |
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147 | xor eax, eax |
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148 | mov dr6, eax |
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5130 | serge | 149 | lea esi, [ebx+APPDATA.dbg_regs] |
2288 | clevermous | 150 | cld |
151 | macro lodsReg [reg] { |
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152 | lodsd |
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153 | mov reg, eax |
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154 | } lodsReg dr0, dr1, dr2, dr3, dr7 |
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155 | purge lodsReg |
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156 | @@: |
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157 | ret |
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158 | ;end. |
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159 | |||
160 | |||
2381 | hidnplayr | 161 | struct MUTEX_WAITER |
162 | list LHEAD |
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163 | task dd ? |
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5343 | serge | 164 | type dd ? |
2381 | hidnplayr | 165 | ends |
2288 | clevermous | 166 | |
5344 | serge | 167 | RWSEM_WAITING_FOR_WRITE equ 0 |
168 | RWSEM_WAITING_FOR_READ equ 1 |
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169 | |||
2288 | clevermous | 170 | ;void __fastcall mutex_init(struct mutex *lock) |
171 | |||
172 | align 4 |
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173 | mutex_init: |
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5343 | serge | 174 | mov [ecx+MUTEX.wait_list.next], ecx |
175 | mov [ecx+MUTEX.wait_list.prev], ecx |
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2288 | clevermous | 176 | mov [ecx+MUTEX.count], 1 |
177 | ret |
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178 | |||
179 | ;void __fastcall mutex_lock(struct mutex *lock) |
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180 | |||
181 | align 4 |
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182 | mutex_lock: |
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183 | |||
184 | dec [ecx+MUTEX.count] |
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185 | jns .done |
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186 | |||
187 | pushfd |
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188 | cli |
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189 | |||
2381 | hidnplayr | 190 | sub esp, sizeof.MUTEX_WAITER |
2288 | clevermous | 191 | |
192 | list_add_tail esp, ecx ;esp= new waiter, ecx= list head |
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193 | |||
194 | mov edx, [TASK_BASE] |
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195 | mov [esp+MUTEX_WAITER.task], edx |
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196 | |||
197 | .forever: |
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198 | |||
199 | mov eax, -1 |
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200 | xchg eax, [ecx+MUTEX.count] |
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201 | dec eax |
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202 | jz @F |
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203 | |||
204 | mov [edx+TASKDATA.state], 1 |
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205 | call change_task |
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206 | jmp .forever |
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207 | @@: |
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5343 | serge | 208 | mov eax, ecx |
209 | list_del esp |
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2288 | clevermous | 210 | |
5343 | serge | 211 | cmp [eax+MUTEX.wait_list.next], eax |
2288 | clevermous | 212 | jne @F |
213 | |||
5343 | serge | 214 | mov [eax+MUTEX.count], 0 |
2288 | clevermous | 215 | @@: |
2381 | hidnplayr | 216 | add esp, sizeof.MUTEX_WAITER |
2288 | clevermous | 217 | |
218 | popfd |
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219 | .done: |
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220 | ret |
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221 | |||
222 | ;void __fastcall mutex_unlock(struct mutex *lock) |
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223 | |||
224 | align 4 |
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225 | mutex_unlock: |
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226 | |||
227 | pushfd |
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228 | cli |
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229 | |||
5343 | serge | 230 | mov eax, [ecx+MUTEX.wait_list.next] |
2288 | clevermous | 231 | cmp eax, ecx |
232 | mov [ecx+MUTEX.count], 1 |
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233 | je @F |
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234 | |||
235 | mov eax, [eax+MUTEX_WAITER.task] |
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236 | mov [eax+TASKDATA.state], 0 |
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237 | @@: |
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238 | popfd |
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239 | ret |
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240 | |||
241 | |||
5344 | serge | 242 | ;void __fastcall init_rwsem(struct rw_semaphore *sem) |
243 | |||
244 | align 4 |
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245 | init_rwsem: |
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246 | mov [ecx+RWSEM.wait_list.next], ecx |
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247 | mov [ecx+RWSEM.wait_list.prev], ecx |
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248 | mov [ecx+RWSEM.count], 0 |
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249 | ret |
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250 | |||
5343 | serge | 251 | ;void __fastcall down_read(struct rw_semaphore *sem) |
252 | |||
253 | align 4 |
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254 | down_read: |
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255 | pushfd |
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256 | cli |
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257 | |||
258 | mov eax, [ecx+RWSEM.count] |
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259 | test eax, eax |
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260 | js @F |
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261 | |||
262 | cmp ecx, [ecx+RWSEM.wait_list.next] |
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263 | je .ok |
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264 | @@: |
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265 | sub esp, sizeof.MUTEX_WAITER |
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266 | |||
267 | mov eax, [TASK_BASE] |
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268 | mov [esp+MUTEX_WAITER.task], eax |
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5344 | serge | 269 | mov [esp+MUTEX_WAITER.type], RWSEM_WAITING_FOR_READ |
5343 | serge | 270 | mov [eax+TASKDATA.state], 1 |
271 | |||
272 | list_add_tail esp, ecx ;esp= new waiter, ecx= list head |
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273 | |||
274 | call change_task |
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275 | |||
276 | add esp, sizeof.MUTEX_WAITER |
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277 | popfd |
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278 | ret |
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279 | .ok: |
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280 | inc eax |
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281 | mov [ecx+RWSEM.count], eax |
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282 | |||
283 | popfd |
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284 | ret |
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285 | |||
286 | ;void __fastcall down_write(struct rw_semaphore *sem) |
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287 | |||
288 | align 4 |
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289 | down_write: |
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290 | pushfd |
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291 | cli |
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292 | sub esp, sizeof.MUTEX_WAITER |
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293 | |||
294 | mov edx, [TASK_BASE] |
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295 | mov [esp+MUTEX_WAITER.task], edx |
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5344 | serge | 296 | mov [esp+MUTEX_WAITER.type], RWSEM_WAITING_FOR_WRITE |
5343 | serge | 297 | mov [edx+TASKDATA.state], 1 |
298 | |||
299 | list_add_tail esp, ecx ;esp= new waiter, ecx= list head |
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300 | |||
301 | xor eax, eax |
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302 | not eax |
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303 | |||
304 | .forever: |
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305 | test eax, [ecx+RWSEM.count] |
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306 | jz @F |
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307 | |||
308 | mov [edx+TASKDATA.state], 1 |
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309 | call change_task |
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310 | jmp .forever |
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311 | @@: |
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312 | mov [ecx+RWSEM.count], eax |
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313 | list_del esp |
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314 | |||
315 | add esp, sizeof.MUTEX_WAITER |
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316 | popfd |
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317 | ret |
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318 | |||
5344 | serge | 319 | ;void __fastcall up_read(struct rw_semaphore *sem) |
320 | |||
321 | align 4 |
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322 | up_read: |
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323 | pushfd |
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324 | cli |
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325 | |||
326 | dec [ecx+RWSEM.count] |
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327 | jnz @F |
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328 | |||
329 | mov eax, [ecx+RWSEM.wait_list.next] |
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330 | cmp eax, ecx |
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331 | je @F |
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332 | |||
333 | mov eax, [eax+MUTEX_WAITER.task] |
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334 | mov [eax+TASKDATA.state], 0 |
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335 | @@: |
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336 | popfd |
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337 | ret |
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338 | |||
339 | ;void __fastcall up_write(struct rw_semaphore *sem) |
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340 | |||
341 | align 4 |
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342 | up_write: |
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343 | |||
344 | pushfd |
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345 | cli |
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346 | |||
347 | mov eax, [ecx+RWSEM.wait_list.next] |
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348 | mov [ecx+RWSEM.count], 0 |
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349 | |||
350 | cmp ecx, eax |
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351 | je .done |
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352 | |||
353 | mov edx, [eax+MUTEX_WAITER.type] |
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354 | test edx, edx |
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355 | jnz .wake |
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356 | |||
357 | mov eax, [eax+MUTEX_WAITER.task] |
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358 | mov [eax+TASKDATA.state], 0 |
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359 | .done: |
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360 | popfd |
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361 | ret |
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362 | |||
363 | .wake: |
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364 | push ebx |
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365 | push esi |
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366 | push edi |
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367 | |||
368 | xor esi, esi |
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369 | mov edi, ecx |
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370 | |||
371 | .wake_list: |
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372 | |||
373 | mov ebx, [eax+MUTEX_WAITER.list.next] |
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374 | list_del eax |
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375 | mov edx, [eax+MUTEX_WAITER.task] |
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376 | mov [edx+TASKDATA.state], 0 |
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377 | inc esi |
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378 | cmp edi, ebx |
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379 | je .wake_done |
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380 | |||
381 | mov ecx, [ebx+MUTEX_WAITER.type] |
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382 | test ecx, ecx |
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383 | jz .wake_done |
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384 | |||
385 | mov eax, ebx |
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386 | jmp .wake_list |
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387 | |||
388 | .wake_done: |
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389 | add [edi+RWSEM.count], esi |
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390 | |||
391 | pop edi |
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392 | pop esi |
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393 | pop ebx |
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394 | popfd |
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395 | ret |
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396 | |||
397 | |||
2288 | clevermous | 398 | purge MUTEX_WAITER |
5344 | serge | 399 | purge RWSEM_WAITING_FOR_WRITE |
400 | purge RWSEM_WAITING_FOR_READ |
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2288 | clevermous | 401 | |
5344 | serge | 402 | |
3534 | clevermous | 403 | MAX_PRIORITY = 0 ; highest, used for kernel tasks |
404 | USER_PRIORITY = 1 ; default |
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405 | IDLE_PRIORITY = 2 ; lowest, only IDLE thread goes here |
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406 | NR_SCHED_QUEUES = 3 ; MUST equal IDLE_PRIORYTY + 1 |
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407 | |||
408 | uglobal |
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409 | ; [scheduler_current + i*4] = zero if there are no threads with priority i, |
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410 | ; pointer to APPDATA of the current thread with priority i otherwise. |
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411 | align 4 |
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412 | scheduler_current rd NR_SCHED_QUEUES |
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413 | endg |
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414 | |||
415 | ; Add the given thread to the given priority list for the scheduler. |
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416 | ; in: edx -> APPDATA, ecx = priority |
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417 | proc scheduler_add_thread |
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418 | ; 1. Acquire the lock. |
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419 | spin_lock_irqsave SchedulerLock |
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420 | ; 2. Store the priority in APPDATA structure. |
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421 | mov [edx+APPDATA.priority], ecx |
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422 | ; 3. There are two different cases: the given list is empty or not empty. |
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423 | ; In first case, go to 6. Otherwise, advance to 4. |
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424 | mov eax, [scheduler_current+ecx*4] |
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425 | test eax, eax |
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426 | jz .new_list |
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427 | ; 4. Insert the new item immediately before the current item. |
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428 | mov ecx, [eax+APPDATA.in_schedule.prev] |
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429 | mov [edx+APPDATA.in_schedule.next], eax |
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430 | mov [edx+APPDATA.in_schedule.prev], ecx |
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431 | mov [eax+APPDATA.in_schedule.prev], edx |
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432 | mov [ecx+APPDATA.in_schedule.next], edx |
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433 | ; 5. Release the lock and return. |
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434 | spin_unlock_irqrestore SchedulerLock |
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435 | ret |
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436 | .new_list: |
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437 | ; 6. Initialize the list with one item and make it the current item. |
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438 | mov [edx+APPDATA.in_schedule.next], edx |
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439 | mov [edx+APPDATA.in_schedule.prev], edx |
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440 | mov [scheduler_current+ecx*4], edx |
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441 | ; 7. Release the lock and return. |
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442 | spin_unlock_irqrestore SchedulerLock |
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443 | ret |
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444 | endp |
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445 | |||
446 | ; Remove the given thread from the corresponding priority list for the scheduler. |
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447 | ; in: edx -> APPDATA |
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448 | proc scheduler_remove_thread |
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449 | ; 1. Acquire the lock. |
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450 | spin_lock_irqsave SchedulerLock |
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451 | ; 2. Remove the item from the corresponding list. |
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452 | mov eax, [edx+APPDATA.in_schedule.next] |
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453 | mov ecx, [edx+APPDATA.in_schedule.prev] |
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454 | mov [eax+APPDATA.in_schedule.prev], ecx |
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455 | mov [ecx+APPDATA.in_schedule.next], eax |
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456 | ; 3. If the given thread is the current item in the list, |
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457 | ; advance the current item. |
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458 | ; 3a. Check whether the given thread is the current item; |
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459 | ; if no, skip the rest of this step. |
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460 | mov ecx, [edx+APPDATA.priority] |
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461 | cmp [scheduler_current+ecx*4], edx |
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462 | jnz .return |
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463 | ; 3b. Set the current item to eax; step 2 has set eax = next item. |
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464 | mov [scheduler_current+ecx*4], eax |
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465 | ; 3c. If there were only one item in the list, zero the current item. |
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466 | cmp eax, edx |
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467 | jnz .return |
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468 | mov [scheduler_current+ecx*4], 0 |
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469 | .return: |
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470 | ; 4. Release the lock and return. |
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471 | spin_unlock_irqrestore SchedulerLock |
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472 | ret |
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473 | endp |
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474 | |||
3615 | clevermous | 475 | SCHEDULE_ANY_PRIORITY = 0 |
476 | SCHEDULE_HIGHER_PRIORITY = 1 |
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3534 | clevermous | 477 | ;info: |
478 | ; Find next task to execute |
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3615 | clevermous | 479 | ;in: |
480 | ; bl = SCHEDULE_ANY_PRIORITY: |
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481 | ; consider threads with any priority |
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482 | ; bl = SCHEDULE_HIGHER_PRIORITY: |
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483 | ; consider only threads with strictly higher priority than the current one, |
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484 | ; keep running the current thread if other ready threads have the same or lower priority |
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3534 | clevermous | 485 | ;retval: |
486 | ; ebx = address of the APPDATA for the selected task (slot-base) |
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487 | ; edi = address of the TASKDATA for the selected task |
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488 | ; ZF = 1 if the task is the same |
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489 | ;warning: |
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490 | ; [CURRENT_TASK] = bh , [TASK_BASE] = edi -- as result |
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491 | ; [current_slot] is not set to new value (ebx)!!! |
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492 | ;scratched: eax,ecx |
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493 | proc find_next_task |
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494 | call update_counters |
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495 | spin_lock_irqsave SchedulerLock |
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3615 | clevermous | 496 | push NR_SCHED_QUEUES |
497 | ; If bl == SCHEDULE_ANY_PRIORITY = 0, loop over all NR_SCHED lists. |
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498 | ; Otherwise, loop over first [APPDATA.priority] lists. |
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499 | test bl, bl |
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500 | jz .start |
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501 | mov ebx, [current_slot] |
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502 | mov edi, [TASK_BASE] |
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503 | mov eax, [ebx+APPDATA.priority] |
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504 | test eax, eax |
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505 | jz .unlock_found |
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506 | mov [esp], eax |
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507 | .start: |
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3534 | clevermous | 508 | xor ecx, ecx |
509 | .priority_loop: |
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510 | mov ebx, [scheduler_current+ecx*4] |
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511 | test ebx, ebx |
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512 | jz .priority_next |
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513 | .task_loop: |
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514 | mov ebx, [ebx+APPDATA.in_schedule.next] |
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515 | mov edi, ebx |
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516 | shr edi, 3 |
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517 | add edi, CURRENT_TASK - (SLOT_BASE shr 3) |
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518 | mov al, [edi+TASKDATA.state] |
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519 | test al, al |
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520 | jz .task_found ; state == 0 |
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521 | cmp al, 5 |
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522 | jne .task_next ; state == 1,2,3,4,9 |
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523 | ; state == 5 |
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524 | pushad ; more freedom for [APPDATA.wait_test] |
||
525 | call [ebx+APPDATA.wait_test] |
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526 | mov [esp+28], eax |
||
527 | popad |
||
528 | or eax, eax |
||
529 | jnz @f |
||
530 | ; testing for timeout |
||
531 | mov eax, [timer_ticks] |
||
532 | sub eax, [ebx+APPDATA.wait_begin] |
||
533 | cmp eax, [ebx+APPDATA.wait_timeout] |
||
534 | jb .task_next |
||
535 | xor eax, eax |
||
536 | @@: |
||
537 | mov [ebx+APPDATA.wait_param], eax ; retval for wait |
||
538 | mov [edi+TASKDATA.state], 0 |
||
539 | .task_found: |
||
540 | mov [scheduler_current+ecx*4], ebx |
||
3617 | clevermous | 541 | ; If we have selected a thread with higher priority |
542 | ; AND rescheduling is due to IRQ, |
||
543 | ; turn the current scheduler list one entry back, |
||
544 | ; so the current thread will be next after high-priority thread is done. |
||
545 | mov ecx, [esp] |
||
546 | cmp ecx, NR_SCHED_QUEUES |
||
547 | jz .unlock_found |
||
548 | mov eax, [current_slot] |
||
549 | mov eax, [eax+APPDATA.in_schedule.prev] |
||
550 | mov [scheduler_current+ecx*4], eax |
||
3615 | clevermous | 551 | .unlock_found: |
552 | pop ecx |
||
3534 | clevermous | 553 | spin_unlock_irqrestore SchedulerLock |
554 | .found: |
||
555 | mov [CURRENT_TASK], bh |
||
556 | mov [TASK_BASE], edi |
||
557 | rdtsc ;call _rdtsc |
||
558 | mov [edi+TASKDATA.counter_add], eax; for next using update_counters |
||
559 | cmp ebx, [current_slot] |
||
560 | ret |
||
561 | .task_next: |
||
562 | cmp ebx, [scheduler_current+ecx*4] |
||
563 | jnz .task_loop |
||
564 | .priority_next: |
||
565 | inc ecx |
||
3615 | clevermous | 566 | cmp ecx, [esp] |
3534 | clevermous | 567 | jb .priority_loop |
3615 | clevermous | 568 | mov ebx, [current_slot] |
569 | mov edi, [TASK_BASE] |
||
570 | jmp .unlock_found |
||
3534 | clevermous | 571 | endp |
572 | |||
2288 | clevermous | 573 | if 0 |
574 | |||
575 | struc TIMER |
||
576 | { |
||
577 | .next dd ? |
||
578 | .exp_time dd ? |
||
579 | .func dd ? |
||
580 | .arg dd ? |
||
581 | } |
||
582 | |||
583 | |||
584 | uglobal |
||
585 | rdy_head rd 16 |
||
586 | endg |
||
587 | |||
588 | align 4 |
||
589 | pick_task: |
||
590 | |||
591 | xor eax, eax |
||
592 | .pick: |
||
593 | mov ebx, [rdy_head+eax*4] |
||
594 | test ebx, ebx |
||
595 | jz .next |
||
596 | |||
597 | mov [next_task], ebx |
||
598 | test [ebx+flags.billable] |
||
599 | jz @F |
||
600 | mov [bill_task], ebx |
||
601 | @@: |
||
602 | ret |
||
603 | .next: |
||
604 | inc eax |
||
605 | jmp .pick |
||
606 | |||
607 | ; param |
||
608 | ; eax= task |
||
609 | ; |
||
610 | ; retval |
||
611 | ; eax= task |
||
612 | ; ebx= queue |
||
613 | ; ecx= front if 1 or back if 0 |
||
614 | align 4 |
||
615 | shed: |
||
616 | cmp [eax+.tics_left], 0;signed compare |
||
617 | mov ebx, [eax+.priority] |
||
618 | setg ecx |
||
619 | jg @F |
||
620 | |||
621 | mov edx, [eax+.tics_quantum] |
||
622 | mov [eax+.ticks_left], edx |
||
623 | cmp ebx, (IDLE_PRIORITY-1) |
||
624 | je @F |
||
625 | inc ebx |
||
626 | @@: |
||
627 | ret |
||
628 | |||
629 | ; param |
||
630 | ; eax= task |
||
631 | align 4 |
||
632 | enqueue: |
||
633 | call shed;eax |
||
634 | cmp [rdy_head+ebx*4], 0 |
||
635 | jnz @F |
||
636 | |||
637 | mov [rdy_head+ebx*4], eax |
||
638 | mov [rdy_tail+ebx*4], eax |
||
639 | mov [eax+.next_ready], 0 |
||
640 | jmp .pick |
||
641 | @@: |
||
642 | test ecx, ecx |
||
643 | jz .back |
||
644 | |||
645 | mov ecx, [rdy_head+ebx*4] |
||
646 | mov [eax+.next_ready], ecx |
||
647 | mov [rdy_head+ebx*4], eax |
||
648 | jmp .pick |
||
649 | .back: |
||
650 | mov ecx, [rdy_tail+ebx*4] |
||
651 | mov [ecx+.next_ready], eax |
||
652 | mov [rdy_tail+ebx*4], eax |
||
653 | mov [eax+.next_ready], 0 |
||
654 | .pick: |
||
655 | call pick_proc;select next task |
||
656 | ret |
||
657 | |||
658 | end if---><---><<---> |