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Rev 6 Rev 8
1 
label  next_usage_update   dword   at  0xB008
 1 
label  next_usage_update   dword   at  0xB008
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label  timer_ticks         dword   at  0xFDF0
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label  timer_ticks         dword   at  0xFDF0
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 3 
 
4 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; IRQ0 HANDLER (TIMER INTERRUPT) ;;
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;; IRQ0 HANDLER (TIMER INTERRUPT) ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
7 
 
 - 
 
8 
 
 - 
 
9 
 
 7 
 
10 
align 32
 8 
align 32
11 
irq0:
 9 
irq0:
12 
        cmp   [error_interrupt],-1
 10 
	pushad
13 
        je    no_error_in_previous_process
 - 
 
14 
 
 11 
	push  ds es
15 
        mov   [0xffff],byte 0
 - 
 
16 
 
 12 
	mov   ax, os_data
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        mov   [error_interrupt],-1
 - 
 
18 
 
 13 
	mov   ds, ax
19 
     no_error_in_previous_process:
 14 
	mov   es, ax
20 
 
 15 
 
21 
        mov   edi,[0x3000]
 16 
        mov   edi,[0x3000]
22 
        shl   edi, 3
 17 
        shl   edi, 3
23 
                         ; fields of TSS descriptor:
 18 
                         ; fields of TSS descriptor:
24 
        mov   [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b
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        mov   [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b
25 
 
 20 
 
26 
        inc   dword [timer_ticks]
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        inc   dword [timer_ticks]
27 
 
 22 
 
28 
        mov   eax, [timer_ticks]
 23 
        mov   eax, [timer_ticks]
29 
;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 - 
 
30 
        call  playNote           ; <<<--- INSERT THIS LINE !!!!!!!!!!
 - 
 
31 
;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 - 
 
32 
 
 - 
 
33 
        cmp   eax,[next_usage_update]
 24 
        cmp   eax,[next_usage_update]
34 
        jb    .nocounter
 25 
        jb    .nocounter
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        add   eax,100
 26 
        add   eax,100
36 
        mov   [next_usage_update],eax
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        mov   [next_usage_update],eax
37 
        call  updatecputimes
 28 
        call  updatecputimes
38 
     .nocounter:
 29 
     .nocounter:
- 
 
 30 
 
- 
 
 31 
        call  playNote           ; <<<--- Speaker driver
39 
 
 32 
 
40 
        mov   edi, [0x3010]
 33 
        mov   edi, [0x3010]
41 
 
 34 
 
42 
        mov   ebx, [edi+0x18] ; time stamp counter add
 35 
        mov   ebx, [edi+0x18] ; time stamp counter add
43 
        call  _rdtsc
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        call  _rdtsc
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        sub   eax, ebx
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        sub   eax, ebx
45 
        add   eax, [edi+0x14] ; counter sum
 38 
        add   eax, [edi+0x14] ; counter sum
46 
        mov   [edi+0x14], eax
 39 
        mov   [edi+0x14], eax
47 
 
 40 
 
48 
        mov   ebx,[0x3000]
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        mov   ebx,[0x3000]
49 
 
 42 
 
50 
        cmp   [0xffff], byte 1   ;1
 43 
        cmp   [0xffff], byte 1
51 
        je   do_not_change_task ;je
 44 
        je    .do_not_change_task
52 
 
 45 
 
53 
      .waiting_for_termination:
 46 
      .waiting_for_termination:
54 
      .waiting_for_reuse:
 47 
      .waiting_for_reuse:
55 
        add   edi,0x20
 48 
        add   edi,0x20
56 
        inc   ebx
 49 
        inc   ebx
57 
 
 50 
 
58 
        mov   al, byte [edi+0xA]
 51 
        mov   al, byte [edi+0xA]
59 
        cmp   al, 3
 52 
        cmp   al, 3
60 
        je    .waiting_for_termination
 53 
        je    .waiting_for_termination
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        cmp   al, 4
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        cmp   al, 4
62 
        je    .waiting_for_termination
 55 
        je    .waiting_for_termination
63 
        cmp   al, 9
 56 
        cmp   al, 9
64 
        je    .waiting_for_reuse
 57 
        je    .waiting_for_reuse
65 
 
 58 
 
66 
        cmp   ebx,[0x3004]
 59 
        cmp   ebx,[0x3004]
67 
        jbe   nsched0
 60 
        jbe   @f
68 
        mov   ebx,1
 61 
        mov   ebx,1
69 
        mov   edi,0x3020
 62 
        mov   edi,0x3020
70 
 
 - 
 
71 
      nsched0:
 63 
       @@:
72 
 
 64 
 
73 
        mov   [0x3000],ebx
 65 
        mov   [0x3000],ebx
74 
        mov   [0x3010],edi
 66 
        mov   [0x3010],edi
- 
 
 67 
 
75 
 
 68 
        jmp   @f
- 
 
 69 
     .do_not_change_task:
- 
 
 70 
        mov   [noct], 1
76 
      do_not_change_task:
 71 
       @@:
77 
 
 72 
 
78 
        call  _rdtsc
 73 
        call  _rdtsc
79 
        mov   [edi+0x18],eax
 74 
        mov   [edi+0x18],eax
80 
 
 75 
 
81 
        cmp   [0xffff],byte 0
 76 
        cmp   [0xffff],byte 0
82 
        je    nodecffff
 77 
        je    @f
83 
        dec   byte [0xffff]
 78 
        dec   byte [0xffff]
84 
      nodecffff:
 79 
       @@:
85 
 
 80 
 
86 
 
 81 
 
87 
        shl   ebx, 3
 82 
        shl   ebx, 3
88 
        xor   eax, eax
 83 
        xor   eax, eax
89 
        add   ebx, tss0
 84 
        add   ebx, tss0
90 
        mov   word  [0xB004], bx   ; selector    ;mov   [tss_s],bx
 85 
        mov   word  [0xB004], bx   ; selector
91 
        mov   dword [0xB000], eax  ; offset
 86 
        mov   dword [0xB000], eax  ; offset
92 
 
 87 
 
93 
        mov   al,0x20   ; send End Of Interrupt signal
 88 
        mov   al,0x20   ; send End Of Interrupt signal
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        mov   dx,0x20
 89 
        mov   dx,0x20
95 
        out   dx,al
 90 
        out   dx,al
- 
 
 91 
 
- 
 
 92 
        cmp   [noct], 1
- 
 
 93 
        je    @f
96 
.switch:
 94 
.switch:
97 
        jmp   pword [0xB000]
 95 
        jmp   pword [0xB000]
98 
        inc [context_counter] ;noname & halyavin
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        inc [context_counter] ;noname & halyavin
- 
 
 97 
       @@:
- 
 
 98 
        mov   [noct], 0
- 
 
 99
- 
 
 100 
        pop   es ds
- 
 
 101 
        popad
- 
 
 102 
        iret
- 
 
 103 
 
99
- 
 
100 
        jmp   irq0
 104 
 
101 
 
 105 
 
- 
 
 106 
uglobal
102 
iglobal
 107 
context_counter dd 0 ;noname & halyavin
103 
context_counter dd 0 ;noname & halyavin
 108 
noct db 0
104 
endg
 109 
endg
105 
 
 110 
 
106 
 
 111 
 
107 
align 4
 112 
align 4
108 
change_task:
 113 
change_task:
109 
 
 114 
 
110 
        mov   [0xffff],byte 2
 115 
        mov   [0xffff],byte 2
111 
 
 116 
 
112 
        dec   dword [timer_ticks]  ; because irq0 will increase it
 117 
        dec   dword [timer_ticks]  ; because irq0 will increase it
113 
 
 118 
 
114 
        int   0x20   ; irq0 handler
 119 
        int   0x20   ; irq0 handler
115 
 
 120 
 
116 
        ret
 121 
        ret
117 
 
 122 
 
118 
 
 123 
 
119 
 
 124 
 
120 
align 4
 125 
align 4
121 
updatecputimes:
 126 
updatecputimes:
122 
 
 127 
 
123 
        mov  eax,[idleuse]
 128 
        mov  eax,[idleuse]
124 
        mov  [idleusesec],eax
 129 
        mov  [idleusesec],eax
125 
        mov  [idleuse],dword 0
 130 
        mov  [idleuse],dword 0
126 
        mov  ecx, [0x3004]
 131 
        mov  ecx, [0x3004]
127 
        mov  edi, 0x3020
 132 
        mov  edi, 0x3020
128 
      .newupdate:
 133 
      .newupdate:
129 
        mov  ebx,[edi+0x14]
 134 
        mov  ebx,[edi+0x14]
130 
        mov  [edi+0x1c],ebx
 135 
        mov  [edi+0x1c],ebx
131 
        mov  [edi+0x14],dword 0
 136 
        mov  [edi+0x14],dword 0
132 
        add  edi,0x20
 137 
        add  edi,0x20
133 
        dec  ecx
 138 
        dec  ecx
134 
        jnz  .newupdate
 139 
        jnz  .newupdate
135 
 
 140 
 
136 
        ret
 141 
        ret