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Kernel: Reorganize Arch/x86 directory to Arch/x86_64 after i686 removal
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129 changed files with 482 additions and 1116 deletions
155
Kernel/Arch/x86_64/DescriptorTable.h
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155
Kernel/Arch/x86_64/DescriptorTable.h
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/*
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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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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/StdLibExtras.h>
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#include <AK/Types.h>
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#include <Kernel/VirtualAddress.h>
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#include <AK/Platform.h>
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VALIDATE_IS_X86()
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// Note: These values are x86-64.
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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_DATA3 0x18
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#define GDT_SELECTOR_CODE3 0x20
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#define GDT_SELECTOR_TSS 0x28
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#define GDT_SELECTOR_TSS_PART2 0x30
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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 SystemType {
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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 = 0x9,
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BusyTSS = 0xb,
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CallGate = 0xc,
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InterruptGate = 0xe,
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TrapGate = 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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VERIFY(base.get() <= 0xffffffff);
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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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static_assert(AssertSize<Descriptor, 8>());
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enum class IDTEntryType {
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TaskGate32 = 0b0101,
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InterruptGate16 = 0b110,
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TrapGate16 = 0b111,
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InterruptGate32 = 0b1110,
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TrapGate32 = 0b1111,
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};
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// Clang doesn't format this right due to the compiler magic
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// clang-format off
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struct [[gnu::packed]] IDTEntry
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{
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u16 offset_1; // offset bits 0..15
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u16 selector; // a code segment selector in GDT or LDT
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struct {
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u8 interrupt_stack_table : 3;
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u8 zero : 5; // unused, set to 0
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};
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struct {
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u8 gate_type : 4;
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u8 storage_segment : 1;
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u8 descriptor_privilege_level : 2;
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u8 present : 1;
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} type_attr; // type and attributes
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u16 offset_2; // offset bits 16..31
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u32 offset_3;
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u32 zeros;
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IDTEntry() = default;
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IDTEntry(FlatPtr callback, u16 selector_, IDTEntryType type, u8 storage_segment, u8 privilege_level)
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: offset_1 { (u16)((FlatPtr)callback & 0xFFFF) }
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, selector { selector_ }
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, interrupt_stack_table { 0 }
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, zero { 0 }
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, type_attr {
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.gate_type = (u8)type,
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.storage_segment = storage_segment,
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.descriptor_privilege_level = (u8)(privilege_level & 0b11),
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.present = 1,
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}
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, offset_2 { (u16)((FlatPtr)callback >> 16) }
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, offset_3 { (u32)(((FlatPtr)callback) >> 32) }
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, zeros { 0 }
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{
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}
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FlatPtr off() const
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{
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return (u64)offset_3 << 32 & (u64)offset_2 << 16 & (u64)offset_1;
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}
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IDTEntryType type() const
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{
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return IDTEntryType(type_attr.gate_type);
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}
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};
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// clang-format on
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static_assert(AssertSize<IDTEntry, 2 * sizeof(void*)>());
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}
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