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https://github.com/RGBCube/serenity
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0d934fc991
Alot of code is shared between i386/i686/x86 and x86_64 and a lot probably will be used for compatability modes. So we start by moving the headers into one Directory. We will probalby be able to move some cpp files aswell.
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Leon Albrecht <leon2002.la@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Types.h>
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#include <Kernel/VirtualAddress.h>
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#define GDT_SELECTOR_CODE0 0x08
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#define GDT_SELECTOR_DATA0 0x10
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#define GDT_SELECTOR_CODE3 0x18
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#define GDT_SELECTOR_DATA3 0x20
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#define GDT_SELECTOR_TLS 0x28
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#define GDT_SELECTOR_PROC 0x30
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#define GDT_SELECTOR_TSS 0x38
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// SYSENTER makes certain assumptions on how the GDT is structured:
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static_assert(GDT_SELECTOR_CODE0 + 8 == GDT_SELECTOR_DATA0); // SS0 = CS0 + 8
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// SYSEXIT makes certain assumptions on how the GDT is structured:
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static_assert(GDT_SELECTOR_CODE0 + 16 == GDT_SELECTOR_CODE3); // CS3 = CS0 + 16
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static_assert(GDT_SELECTOR_CODE0 + 24 == GDT_SELECTOR_DATA3); // SS3 = CS0 + 32
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namespace Kernel {
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struct [[gnu::packed]] DescriptorTablePointer {
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u16 limit;
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void* address;
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};
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union [[gnu::packed]] Descriptor {
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struct {
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u16 limit_lo;
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u16 base_lo;
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u8 base_hi;
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u8 type : 4;
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u8 descriptor_type : 1;
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u8 dpl : 2;
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u8 segment_present : 1;
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u8 limit_hi : 4;
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u8 : 1;
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u8 operation_size64 : 1;
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u8 operation_size32 : 1;
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u8 granularity : 1;
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u8 base_hi2;
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};
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struct {
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u32 low;
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u32 high;
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};
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enum Type {
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Invalid = 0,
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AvailableTSS_16bit = 0x1,
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LDT = 0x2,
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BusyTSS_16bit = 0x3,
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CallGate_16bit = 0x4,
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TaskGate = 0x5,
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InterruptGate_16bit = 0x6,
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TrapGate_16bit = 0x7,
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AvailableTSS_32bit = 0x9,
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BusyTSS_32bit = 0xb,
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CallGate_32bit = 0xc,
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InterruptGate_32bit = 0xe,
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TrapGate_32bit = 0xf,
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};
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VirtualAddress base() const
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{
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FlatPtr base = base_lo;
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base |= base_hi << 16u;
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base |= base_hi2 << 24u;
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return VirtualAddress { base };
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}
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void set_base(VirtualAddress base)
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{
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base_lo = base.get() & 0xffffu;
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base_hi = (base.get() >> 16u) & 0xffu;
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base_hi2 = (base.get() >> 24u) & 0xffu;
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}
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void set_limit(u32 length)
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{
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limit_lo = length & 0xffff;
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limit_hi = (length >> 16) & 0xf;
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}
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};
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}
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