Kieron Morris
64b3c9a7ba
Added the apache license to all source files, accounting for authors. Also added a license.md containing the apache license + contributors.md listing all contributors.
111 lines
2.4 KiB
ObjectPascal
111 lines
2.4 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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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. |