103 lines
2.3 KiB
ObjectPascal
103 lines
2.3 KiB
ObjectPascal
// Copyright 2021 Kieron Morris
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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{
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Driver->Timer->arch.x86.isr.tmr0 - 8khz Timer Driver.
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@author(Kieron Morris <[email protected]>)
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}
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unit arch.x86.isr.tmr0;
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interface
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uses
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core.util, arch.x86.util,
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arch.x86.isr.types,
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arch.x86.isr.mgr,
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arch.x86.idt;
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const
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PIT_INPUT_HZ = 1193182;
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PIT_DIVISOR = 149;
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procedure register();
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procedure hook(hook_method : uint32);
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procedure unhook(hook_method : uint32);
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implementation
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var
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Hooks : Array[0..MAX_HOOKS-1] of pp_hook_method;
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Registered : boolean = false;
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procedure Main; //IRQ0, ~8001hz
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var
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i : integer;
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begin
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CLI;
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for i:=0 to MAX_HOOKS-1 do begin
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if uint32(Hooks[i]) <> 0 then begin
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Hooks[i](nil);
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end;
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end;
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end;
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procedure register();
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begin
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if not registered then begin
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asm
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mov ax, PIT_DIVISOR
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out $40, al
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mov al, ah
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out $40, al
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end;
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memset(uint32(@Hooks[0]), 0, sizeof(pp_hook_method)*MAX_HOOKS);
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arch.x86.isr.mgr.registerISR(32, @Main);
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Registered:= true;
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end;
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//arch.x86.idt.set_gate(32, uint32(@Main), $08, ISR_RING_0);
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end;
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procedure hook(hook_method : uint32);
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var
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i : uint32;
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begin
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register();
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for i:=0 to MAX_HOOKS-1 do begin
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if uint32(Hooks[i]) = hook_method then exit;
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end;
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for i:=0 to MAX_HOOKS-1 do begin
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if uint32(Hooks[i]) = 0 then begin
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Hooks[i]:= pp_hook_method(hook_method);
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exit;
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end;
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end;
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end;
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procedure unhook(hook_method : uint32);
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var
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i : uint32;
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begin
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for i:=0 to MAX_HOOKS-1 do begin
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If uint32(Hooks[i]) = hook_method then begin
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Hooks[i]:= nil;
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exit;
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end;
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end;
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end;
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end.
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