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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 | |||
5 | align 32 |
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6 | irq0: |
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8 | poddubny | 7 | pushad |
8 | push ds es |
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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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1 | ha | 12 | |
13 | mov edi,[0x3000] |
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14 | shl edi, 3 |
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15 | ; fields of TSS descriptor: |
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16 | mov [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b |
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17 | |||
18 | inc dword [timer_ticks] |
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19 | |||
20 | mov eax, [timer_ticks] |
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21 | cmp eax,[next_usage_update] |
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22 | jb .nocounter |
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23 | add eax,100 |
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24 | mov [next_usage_update],eax |
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25 | call updatecputimes |
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26 | .nocounter: |
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27 | |||
8 | poddubny | 28 | call playNote ; <<<--- Speaker driver |
29 | |||
1 | ha | 30 | mov edi, [0x3010] |
31 | |||
32 | mov ebx, [edi+0x18] ; time stamp counter add |
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33 | call _rdtsc |
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34 | sub eax, ebx |
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35 | add eax, [edi+0x14] ; counter sum |
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36 | mov [edi+0x14], eax |
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37 | |||
38 | mov ebx,[0x3000] |
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39 | |||
8 | poddubny | 40 | cmp [0xffff], byte 1 |
41 | je .do_not_change_task |
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1 | ha | 42 | |
43 | .waiting_for_termination: |
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44 | .waiting_for_reuse: |
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45 | add edi,0x20 |
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46 | inc ebx |
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47 | |||
48 | mov al, byte [edi+0xA] |
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49 | cmp al, 3 |
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50 | je .waiting_for_termination |
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51 | cmp al, 4 |
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52 | je .waiting_for_termination |
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53 | cmp al, 9 |
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54 | je .waiting_for_reuse |
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55 | |||
56 | cmp ebx,[0x3004] |
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8 | poddubny | 57 | jbe @f |
1 | ha | 58 | mov ebx,1 |
59 | mov edi,0x3020 |
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8 | poddubny | 60 | @@: |
1 | ha | 61 | |
62 | mov [0x3000],ebx |
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63 | mov [0x3010],edi |
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64 | |||
8 | poddubny | 65 | .do_not_change_task: |
1 | ha | 66 | |
67 | call _rdtsc |
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68 | mov [edi+0x18],eax |
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69 | |||
70 | shl ebx, 3 |
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71 | xor eax, eax |
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72 | add ebx, tss0 |
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14 | poddubny | 73 | mov word [far_jump.sel], bx ; selector |
74 | mov dword [far_jump.offs], eax ; offset |
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1 | ha | 75 | |
76 | mov al,0x20 ; send End Of Interrupt signal |
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77 | mov dx,0x20 |
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78 | out dx,al |
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8 | poddubny | 79 | |
10 | poddubny | 80 | cmp [0xffff],byte 0 |
81 | je .switch |
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82 | dec byte [0xffff] |
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11 | poddubny | 83 | jz @f |
10 | poddubny | 84 | .switch: |
14 | poddubny | 85 | jmp pword [far_jump] |
9 | halyavin | 86 | inc [context_counter] ;noname & halyavin |
8 | poddubny | 87 | @@: |
10 | poddubny | 88 | |
8 | poddubny | 89 | pop es ds |
90 | popad |
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91 | iret |
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1 | ha | 92 | |
8 | poddubny | 93 | |
94 | uglobal |
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14 | poddubny | 95 | far_jump: |
96 | .offs dd ? |
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97 | .sel dw ? |
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98 | context_counter dd ? ;noname & halyavin |
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99 | next_usage_update dd ? |
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100 | timer_ticks dd ? |
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1 | ha | 101 | endg |
102 | |||
103 | |||
104 | align 4 |
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105 | change_task: |
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106 | |||
107 | mov [0xffff],byte 2 |
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108 | |||
109 | dec dword [timer_ticks] ; because irq0 will increase it |
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110 | |||
111 | int 0x20 ; irq0 handler |
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112 | |||
113 | ret |
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114 | |||
115 | |||
116 | |||
117 | align 4 |
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118 | updatecputimes: |
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119 | |||
120 | mov eax,[idleuse] |
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121 | mov [idleusesec],eax |
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122 | mov [idleuse],dword 0 |
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123 | mov ecx, [0x3004] |
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124 | mov edi, 0x3020 |
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125 | .newupdate: |
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126 | mov ebx,[edi+0x14] |
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127 | mov [edi+0x1c],ebx |
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128 | mov [edi+0x14],dword 0 |
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129 | add edi,0x20 |
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130 | dec ecx |
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131 | jnz .newupdate |
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132 | |||
133 | ret---><---><<---> |