287 lines
6.4 KiB
PHP
287 lines
6.4 KiB
PHP
label next_usage_update dword at 0xB008
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label timer_ticks dword at 0xFDF0
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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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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cmp [error_interrupt],-1
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je no_error_in_previous_process
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mov edi,[error_interrupt]
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shl edi, 3
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mov [edi+tss0i_l +5], word 01010000b *256 +11101001b
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mov edi,[error_interrupt]
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shl edi,7
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add edi,0x290000
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mov esi,[error_interrupt_entry]
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mov [edi+l.eip-tss_sceleton],esi
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mov [edi+l.eflags-tss_sceleton],dword 0x11002
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mov [0xffff],byte 0
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mov [error_interrupt],-1
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no_error_in_previous_process:
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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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;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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call playNote ; <<<--- INSERT THIS LINE !!!!!!!!!!
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;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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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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cmp [0xffff], byte 1 ;1
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je do_not_change_task ;je
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.waiting_for_termination:
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.waiting_for_reuse:
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.waiting_on_queue:
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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, 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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cmp al, 16
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je .waiting_on_queue
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cmp al, 17
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je .waiting_on_queue
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cmp ebx,[0x3004]
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jbe nsched0
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mov ebx,1
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mov edi,0x3020
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nsched0:
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mov [0x3000],ebx
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mov [0x3010],edi
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do_not_change_task:
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mov edx,[0x3000]
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lea edx,[tss0sys+8*edx]
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;mov [8*0x40+idts+8+0], word 0
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mov [8*0x40+idts+8+2],dx
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;mov [8*0x40+idts+8+4],word 11100101b*256
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;mov [8*0x40+idts+8+6], word 0
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call _rdtsc
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mov [edi+0x18],eax
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cmp [0xffff],byte 0
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je nodecffff
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dec byte [0xffff]
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nodecffff:
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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 [0xB004], bx ; selector ;mov [tss_s],bx
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mov dword [0xB000], 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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.switch:
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jmp pword [0xB000]
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inc [context_counter] ;noname & halyavin
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jmp irq0
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iglobal
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context_counter dd 0 ;noname & halyavin
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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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;
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; Wait queue is 16 bytes
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; dd return code +12
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; dd pointer to process +8
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; dd prev +4
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; dd next +0
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;
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; eax - pointer to pointer to the wait queue
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; return:
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; ecx - return code
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sleep_on_queue:
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sub esp,16 ; reserve space for wait node
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mov ecx,esp ; ecx=this_node, [eax]=queue
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pusha
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mov ebx,[0x3010] ; get pointer to the current process
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mov [ecx+8],ebx
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pushf
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cli ; adding element to the wait queue must be atomic
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mov edi,[eax] ; edi=queue
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and edi,edi ; check if queue is empty
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jz .is_empty
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; add element at the end of wait queue
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mov edx,[edi+4] ; get pointer to prev edx=queue->prev
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mov [ecx+4],edx ; this_node->prev=queue->prev
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mov [ecx+0],edi ; this_node->next=queue
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mov [edx+0],ecx ; this_node->prev->next=this_node
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mov [edi+4],ecx ; queue->prev=this_node
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jmp .added_ok
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.is_empty:
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; set this element as first in the queue
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mov [ecx+0],ecx ; this_node->next=this_node
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mov [ecx+4],ecx ; this_node->prev=this_node
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mov [eax],ecx ; [queue]=this_node
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.added_ok:
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popf ; we can safely restore interrupts
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mov [ebx+0xa],byte 17 ; set current task state as sleeping
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call change_task ; schedule new thread
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; someone has called wake_up_queue
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pushf ; disable interrupts
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cli
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mov edx,[ecx+0] ; edx=this_node->next
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mov esi,[ecx+4] ; esi=this_node->prev
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; check if we need to remove this node from head
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cmp [eax],ecx
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jne .no_head
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cmp [ecx+0],ecx ; check if queue is empty
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jne .not_empty
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mov [eax],dword 0
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jmp .no_head
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.not_empty:
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mov [eax],edx
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; remove our node from the queue (this must be atomic)
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.no_head:
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mov [edx+4],esi ; this_node->next->prev=this_node->prev
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mov [esi+0],edx ; this_node->prev->next=this_node->next
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popf
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popa
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add esp,12
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pop ecx
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ret
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; eax - pointer to the wait queue
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; ebx - wake up all (1=yes, 0=no)
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; ecx - return code
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; return:
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; ebx - number of processes woken
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wake_up_queue:
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and eax,eax
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jnz .nz
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ret
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.nz:
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push eax
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push ebx
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push ecx
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push edx
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push esi
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pushf
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cli
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xor ebx,ebx
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mov edx,eax
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.wake_loop:
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mov [edx+12],ecx
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mov esi,[edx+8]
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mov byte [esi+0xa],0
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inc ebx
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mov edx,[edx+0]
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cmp edx,eax
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jne .wake_loop
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and ebx,ebx
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jz .wake_up_1
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.return_it:
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popf
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pop esi
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pop edx
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pop ecx
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add esp,4
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pop eax
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ret
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.wake_up_1:
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mov [eax+12],ecx
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mov ecx,[eax+8]
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mov byte [ecx+0xa],0
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jmp .return_it
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