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Rev | Author | Line No. | Line |
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1 | ha | 1 | label next_usage_update dword at 0xB008 |
2 | label timer_ticks dword at 0xFDF0 |
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3 | |||
4 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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5 | ;; IRQ0 HANDLER (TIMER INTERRUPT) ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | align 32 |
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9 | irq0: |
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10 | |||
11 | cmp [error_interrupt],-1 |
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12 | je no_error_in_previous_process |
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13 | |||
14 | mov edi,[error_interrupt] |
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15 | shl edi, 3 |
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16 | mov [edi+tss0i_l +5], word 01010000b *256 +11101001b |
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17 | |||
18 | mov edi,[error_interrupt] |
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19 | shl edi,7 |
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20 | add edi,0x290000 |
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21 | mov esi,[error_interrupt_entry] |
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22 | mov [edi+l.eip-tss_sceleton],esi |
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23 | mov [edi+l.eflags-tss_sceleton],dword 0x11002 |
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24 | |||
25 | mov [0xffff],byte 0 |
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26 | |||
27 | mov [error_interrupt],-1 |
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28 | |||
29 | no_error_in_previous_process: |
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30 | |||
31 | mov edi,[0x3000] |
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32 | shl edi, 3 |
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33 | ; fields of TSS descriptor: |
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34 | mov [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b |
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35 | |||
36 | inc dword [timer_ticks] |
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37 | |||
38 | mov eax, [timer_ticks] |
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39 | ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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40 | call playNote ; <<<--- INSERT THIS LINE !!!!!!!!!! |
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41 | ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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42 | |||
43 | cmp eax,[next_usage_update] |
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44 | jb .nocounter |
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45 | add eax,100 |
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46 | mov [next_usage_update],eax |
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47 | call updatecputimes |
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48 | .nocounter: |
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49 | |||
50 | mov edi, [0x3010] |
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51 | |||
52 | mov ebx, [edi+0x18] ; time stamp counter add |
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53 | call _rdtsc |
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54 | sub eax, ebx |
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55 | add eax, [edi+0x14] ; counter sum |
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56 | mov [edi+0x14], eax |
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57 | |||
58 | mov ebx,[0x3000] |
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59 | |||
60 | cmp [0xffff], byte 1 ;1 |
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61 | je do_not_change_task ;je |
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62 | |||
63 | .waiting_for_termination: |
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64 | .waiting_for_reuse: |
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65 | add edi,0x20 |
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66 | inc ebx |
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67 | |||
68 | mov al, byte [edi+0xA] |
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69 | cmp al, 3 |
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70 | je .waiting_for_termination |
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71 | cmp al, 4 |
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72 | je .waiting_for_termination |
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73 | cmp al, 9 |
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74 | je .waiting_for_reuse |
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75 | |||
76 | cmp ebx,[0x3004] |
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77 | jbe nsched0 |
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78 | mov ebx,1 |
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79 | mov edi,0x3020 |
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80 | |||
81 | nsched0: |
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82 | |||
83 | mov [0x3000],ebx |
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84 | mov [0x3010],edi |
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85 | |||
86 | do_not_change_task: |
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87 | |||
4 | poddubny | 88 | ;mov edx,[0x3000] |
89 | ;lea edx,[tss0sys+8*edx] |
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1 | ha | 90 | ;mov [8*0x40+idts+8+0], word 0 |
3 | halyavin | 91 | ;mov [8*0x40+idts+8+2],dx |
1 | ha | 92 | ;mov [8*0x40+idts+8+4],word 11100101b*256 |
93 | ;mov [8*0x40+idts+8+6], word 0 |
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94 | |||
95 | call _rdtsc |
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96 | mov [edi+0x18],eax |
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97 | |||
98 | cmp [0xffff],byte 0 |
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99 | je nodecffff |
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100 | dec byte [0xffff] |
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101 | nodecffff: |
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102 | |||
103 | |||
104 | shl ebx, 3 |
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105 | xor eax, eax |
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106 | add ebx, tss0 |
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107 | mov word [0xB004], bx ; selector ;mov [tss_s],bx |
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108 | mov dword [0xB000], eax ; offset |
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109 | |||
110 | mov al,0x20 ; send End Of Interrupt signal |
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111 | mov dx,0x20 |
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112 | out dx,al |
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113 | .switch: |
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114 | jmp pword [0xB000] |
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115 | inc [context_counter] ;noname & halyavin |
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116 | jmp irq0 |
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117 | |||
118 | iglobal |
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119 | context_counter dd 0 ;noname & halyavin |
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120 | endg |
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121 | |||
122 | |||
123 | align 4 |
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124 | change_task: |
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125 | |||
126 | mov [0xffff],byte 2 |
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127 | |||
128 | dec dword [timer_ticks] ; because irq0 will increase it |
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129 | |||
130 | int 0x20 ; irq0 handler |
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131 | |||
132 | ret |
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133 | |||
134 | |||
135 | |||
136 | align 4 |
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137 | updatecputimes: |
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138 | |||
139 | mov eax,[idleuse] |
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140 | mov [idleusesec],eax |
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141 | mov [idleuse],dword 0 |
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142 | mov ecx, [0x3004] |
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143 | mov edi, 0x3020 |
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144 | .newupdate: |
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145 | mov ebx,[edi+0x14] |
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146 | mov [edi+0x1c],ebx |
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147 | mov [edi+0x14],dword 0 |
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148 | add edi,0x20 |
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149 | dec ecx |
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150 | jnz .newupdate |
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151 | |||
152 | ret---><---><<---> |