mirror of
https://github.com/Fennix-Project/Kernel.git
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68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef __FENNIX_KERNEL_GDT_H__
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#define __FENNIX_KERNEL_GDT_H__
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#include <types.h>
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#include <cpu/x86/x64/SegmentDescriptors.hpp>
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namespace GlobalDescriptorTable
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{
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struct TaskStateSegment
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{
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uint32_t Reserved0 __aligned(16);
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uint64_t StackPointer[3];
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uint64_t Reserved1;
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uint64_t InterruptStackTable[7];
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uint64_t Reserved2;
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uint16_t Reserved3;
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uint16_t IOMapBaseAddressOffset;
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} __packed;
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struct GlobalDescriptorTableEntries
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{
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uint64_t Null;
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CodeSegmentDescriptor Code;
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DataSegmentDescriptor Data;
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DataSegmentDescriptor UserData;
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CodeSegmentDescriptor UserCode;
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SystemSegmentDescriptor TaskStateSegment;
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} __packed;
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struct GlobalDescriptorTableDescriptor
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{
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uint16_t Limit;
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GlobalDescriptorTableEntries *BaseAddress;
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} __packed;
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extern void *CPUStackPointer[];
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extern TaskStateSegment tss[];
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void Init(int Core);
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void SetKernelStack(void *Stack);
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void *GetKernelStack();
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}
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#define GDT_KERNEL_CODE offsetof(GlobalDescriptorTable::GlobalDescriptorTableEntries, Code)
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#define GDT_KERNEL_DATA offsetof(GlobalDescriptorTable::GlobalDescriptorTableEntries, Data)
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#define GDT_USER_CODE (offsetof(GlobalDescriptorTable::GlobalDescriptorTableEntries, UserCode) | 3)
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#define GDT_USER_DATA (offsetof(GlobalDescriptorTable::GlobalDescriptorTableEntries, UserData) | 3)
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#define GDT_TSS (offsetof(GlobalDescriptorTable::GlobalDescriptorTableEntries, TaskStateSegment) | 3)
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#endif // !__FENNIX_KERNEL_GDT_H__
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