155 lines
3.3 KiB
PHP
155 lines
3.3 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; IRQ0 HANDLER (TIMER INTERRUPT) ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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align 32
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irq0:
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save_ring3_context
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mov ax, os_data
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mov ds, ax
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mov es, ax
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mov edi,[0x3000]
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shl edi, 3
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; fields of TSS descriptor:
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; mov [edi+gdts+ tss0 +5], word 01010000b *256 +11101001b
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inc dword [timer_ticks]
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mov eax, [timer_ticks]
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call playNote ; <<<--- Speaker driver
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cmp eax,[next_usage_update]
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jb .nocounter
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add eax,100
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mov [next_usage_update],eax
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call updatecputimes
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.nocounter:
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mov edi, [0x3010]
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mov ebx, [edi+0x18] ; time stamp counter add
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call _rdtsc
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sub eax, ebx
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add eax, [edi+0x14] ; counter sum
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mov [edi+0x14], eax
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mov ebx,[0x3000]
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mov [prev_slot], ebx
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cmp [0xffff], byte 1
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je .do_not_change_task
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.waiting_for_termination:
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.waiting_for_reuse:
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.waiting_for_event:
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.suspended:
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cmp ebx, [0x3004]
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jb @f
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mov edi, 0x3000
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xor ebx, ebx
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@@:
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add edi,0x20
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inc ebx
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mov al, byte [edi+0xA]
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cmp al, 1
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jz .suspended
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cmp al, 2
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jz .suspended
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cmp al, 3
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je .waiting_for_termination
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cmp al, 4
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je .waiting_for_termination
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cmp al, 9
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je .waiting_for_reuse
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mov [0x3000],ebx
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mov [0x3010],edi
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cmp al, 5
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jne .noevents
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call get_event_for_app
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test eax, eax
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jz .waiting_for_event
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mov [event_sched], eax
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mov [edi+0xA], byte 0
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.noevents:
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cmp ebx, [prev_slot]
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sete [0xffff]
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.do_not_change_task:
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call _rdtsc
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mov [edi+0x18],eax
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shl ebx, 3
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xor eax, eax
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add ebx, tss0
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mov word [far_jump.sel], bx ; selector
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mov dword [far_jump.offs], eax ; offset
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mov al,0x20 ; send End Of Interrupt signal
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mov dx,0x20
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out dx,al
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cmp [0xffff],byte 0
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je .switch
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dec byte [0xffff]
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jz @f
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.switch:
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jmp pword [far_jump]
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inc [context_counter] ;noname & halyavin
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@@:
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restore_ring3_context
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iret
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uglobal
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align 4
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far_jump:
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.offs dd ?
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.sel dw ?
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context_counter dd ? ;noname & halyavin
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next_usage_update dd ?
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timer_ticks dd ?
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prev_slot dd ?
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event_sched dd ?
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endg
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align 4
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change_task:
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mov [0xffff],byte 2
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dec dword [timer_ticks] ; because irq0 will increase it
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int 0x20 ; irq0 handler
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ret
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align 4
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updatecputimes:
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mov eax,[idleuse]
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mov [idleusesec],eax
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mov [idleuse],dword 0
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mov ecx, [0x3004]
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mov edi, 0x3020
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.newupdate:
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mov ebx,[edi+0x14]
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mov [edi+0x1c],ebx
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mov [edi+0x14],dword 0
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add edi,0x20
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dec ecx
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jnz .newupdate
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ret
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