97 lines
1.8 KiB
ObjectPascal
97 lines
1.8 KiB
ObjectPascal
{
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TSS - Task State Segment (stub).
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@author(Kieron Morris <kjm@kieronmorris.me>)
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}
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unit tss;
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interface
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uses
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gdt,
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vmemorymanager,
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console;
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type
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TTaskStateSegment = packed record
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link : uint16;
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link_h : uint16;
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esp0 : uint32;
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ss0 : uint16;
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ss0_h : uint16;
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esp1 : uint32;
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ss1 : uint16;
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ss1_h : uint16;
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esp2 : uint32;
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ss2 : uint16;
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ss2_h : uint16;
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cr3 : uint32;
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eip : uint32;
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eflags : uint32;
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eax : uint32;
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ecx : uint32;
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edx : uint32;
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ebx : uint32;
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esp : uint32;
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ebp : uint32;
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esi : uint32;
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edi : uint32;
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es : uint16;
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es_h : uint16;
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cs : uint16;
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cs_h : uint16;
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ss : uint16;
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ss_h : uint16;
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ds : uint16;
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ds_h : uint16;
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fs : uint16;
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fs_h : uint16;
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gs : uint16;
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gs_h : uint16;
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ldt : uint16;
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ldt_h : uint16;
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trap : uint16;
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iomap : uint16;
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end;
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PTaskStateSegment = ^TTaskStateSegment;
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var
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TaskStateSegment : TTaskStateSegment;
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ptrTaskStateSegment : PTaskStateSegment = @TaskStateSegment;
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procedure init;
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implementation
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procedure init;
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var
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cESP : uint32;
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cCR3 : uint32;
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begin
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console.outputln('TSS','INIT BEGIN.');
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ptrTaskStateSegment^.ss0:= $08;
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ptrTaskStateSegment^.iomap:= sizeof(TTaskStateSegment)-1;
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asm
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MOV cESP, ESP
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MOV EAX, CR3
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MOV cCR3, EAX
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end;
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ptrTaskStateSegment^.esp0:= cESP;
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ptrTaskStateSegment^.CR3:= cCR3;
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gdt.set_gate($05, uint32(ptrTaskStateSegment) - KERNEL_VIRTUAL_BASE, sizeof(TTaskStateSegment) - 1, $89, $40); //OFFSET: 40
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gdt.reload;
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asm
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mov AX, 40
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ltr AX
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end;
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console.outputln('TSS','INIT END.');
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end;
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end. |