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https://github.com/Fennix-Project/Kernel.git
synced 2025-07-11 07:19:20 +00:00
Compiles on x86 but everything is broken
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Alex
@ -46,7 +46,6 @@ SECTIONS
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}
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. += CONSTANT(MAXPAGESIZE);
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.bss :
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{
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*(COMMON)
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99
Architecture/i686/cpu/GlobalDescriptorTable.cpp
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99
Architecture/i686/cpu/GlobalDescriptorTable.cpp
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@ -0,0 +1,99 @@
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#include "gdt.hpp"
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#include <memory.hpp>
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#include <smp.hpp>
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#include <cpu.hpp>
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#include <debug.h>
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namespace GlobalDescriptorTable
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{
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static GlobalDescriptorTableEntries GDTEntriesTemplate = {
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// null
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{.Length = 0x0,
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.BaseLow = 0x0,
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.BaseMiddle = 0x0,
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.Access = {.Raw = 0x0},
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.Flags = {.Raw = 0x0},
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.BaseHigh = 0x0},
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// kernel code
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{.Length = 0x0,
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.BaseLow = 0x0,
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.BaseMiddle = 0x0,
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.Access = {.A = 0,
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.RW = 1,
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.DC = 0,
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.E = 1,
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.S = 1,
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.DPL = 0,
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.P = 1},
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.Flags = {.Unknown = 0x0, .L = 1},
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.BaseHigh = 0x0},
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// kernel data
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{.Length = 0x0,
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.BaseLow = 0x0,
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.BaseMiddle = 0x0,
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.Access = {.A = 0,
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.RW = 1,
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.DC = 0,
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.E = 0,
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.S = 1,
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.DPL = 0,
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.P = 1},
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.Flags = {.Raw = 0x0},
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.BaseHigh = 0x0},
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// user data
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{.Length = 0x0,
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.BaseLow = 0x0,
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.BaseMiddle = 0x0,
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.Access = {.A = 0,
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.RW = 1,
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.DC = 0,
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.E = 0,
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.S = 1,
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.DPL = 3,
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.P = 1},
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.Flags = {.Raw = 0x0},
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.BaseHigh = 0x0},
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// user code
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{.Length = 0x0,
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.BaseLow = 0x0,
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.BaseMiddle = 0x0,
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.Access = {.A = 0,
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.RW = 1,
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.DC = 0,
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.E = 1,
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.S = 1,
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.DPL = 3,
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.P = 1},
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.Flags = {.Unknown = 0x0, .L = 1},
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.BaseHigh = 0x0},
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// tss
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{}};
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GlobalDescriptorTableEntries GDTEntries[MAX_CPU];
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GlobalDescriptorTableDescriptor gdt[MAX_CPU];
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TaskStateSegment tss[MAX_CPU] = {
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0,
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{0, 0, 0},
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0,
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{0, 0, 0, 0, 0, 0, 0},
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0,
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0,
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};
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void *CPUStackPointer[MAX_CPU];
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SafeFunction void Init(int Core)
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{
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}
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SafeFunction void SetKernelStack(void *Stack)
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{
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}
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}
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@ -5,7 +5,141 @@
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namespace GlobalDescriptorTable
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{
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/** @brief The GDT Access Table
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* @details For more information, see https://wiki.osdev.org/Global_Descriptor_Table
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*/
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union GlobalDescriptorTableAccess
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{
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struct
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{
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/** @brief Access bit.
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* @note The CPU sets this bit to 1 when the segment is accessed.
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*/
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uint8_t A : 1;
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/** @brief Readable bit for code segments, writable bit for data segments.
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* @details For code segments, this bit must be 1 for the segment to be readable.
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* @details For data segments, this bit must be 1 for the segment to be writable.
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*/
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uint8_t RW : 1;
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/** @brief Direction bit for data segments, conforming bit for code segments.
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* @details For data segments, this bit must be 1 for the segment to grow up (higher addresses).
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* @details For code segments, this bit must be 1 for code in the segment to be able to be executed from an equal or lower privilege level.
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*/
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uint8_t DC : 1;
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/** @brief Executable bit.
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* @details This bit must be 1 for code-segment descriptors.
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* @details This bit must be 0 for data-segment and system descriptors.
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*/
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uint8_t E : 1;
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/** @brief Descriptor type.
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* @details This bit must be 0 for system descriptors.
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* @details This bit must be 1 for code or data segment descriptor.
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*/
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uint8_t S : 1;
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/** @brief Descriptor privilege level.
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* @details This field determines the privilege level of the segment.
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* @details 0 = kernel mode, 3 = user mode.
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*/
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uint8_t DPL : 2;
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/** @brief Present bit.
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* @details This bit must be 1 for all valid descriptors.
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*/
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uint8_t P : 1;
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} __attribute__((packed));
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uint8_t Raw;
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};
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union GlobalDescriptorTableFlags
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{
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// TODO: Add more flags.
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struct
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{
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/** @brief Unknown. */
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uint8_t Unknown : 5;
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/** @brief Long mode.
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* @details If the long mode bit is clear, the segment is in 32-bit protected mode.
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* @details If the long mode bit is set, the segment is in 64-bit long mode.
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*/
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uint8_t L : 1;
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} __attribute__((packed));
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uint8_t Raw;
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};
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typedef struct _TaskStateSegmentEntry
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{
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/* LOW */
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uint16_t Length;
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uint16_t BaseLow;
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uint8_t BaseMiddle;
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GlobalDescriptorTableAccess Flags;
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uint8_t Granularity;
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uint8_t BaseHigh;
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/* HIGH */
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uint32_t BaseUpper;
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uint32_t Reserved;
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} __attribute__((packed)) TaskStateSegmentEntry;
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typedef struct _TaskStateSegment
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{
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uint32_t Reserved0 __attribute__((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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uint16_t Reserved2;
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uint16_t IOMapBaseAddressOffset;
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} __attribute__((packed)) TaskStateSegment;
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typedef struct _GlobalDescriptorTableEntry
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{
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/** @brief Length */
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uint16_t Length;
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/** @brief Low Base */
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uint16_t BaseLow;
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/** @brief Middle Base */
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uint8_t BaseMiddle;
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/** @brief Access */
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GlobalDescriptorTableAccess Access;
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/** @brief Flags */
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GlobalDescriptorTableFlags Flags;
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/** @brief High Base */
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uint8_t BaseHigh;
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} __attribute__((packed)) GlobalDescriptorTableEntry;
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typedef struct _GlobalDescriptorTableEntries
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{
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GlobalDescriptorTableEntry Null;
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GlobalDescriptorTableEntry Code;
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GlobalDescriptorTableEntry Data;
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GlobalDescriptorTableEntry UserData;
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GlobalDescriptorTableEntry UserCode;
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TaskStateSegmentEntry TaskStateSegment;
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} __attribute__((packed)) GlobalDescriptorTableEntries;
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typedef struct _GlobalDescriptorTableDescriptor
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{
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/** @brief GDT entries length */
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uint16_t Length;
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/** @brief GDT entries address */
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GlobalDescriptorTableEntries *Entries;
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} __attribute__((packed)) GlobalDescriptorTableDescriptor;
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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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}
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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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@ -27,6 +27,23 @@ SECTIONS
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}
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_kernel_rodata_end = .;
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.init_array :
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{
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PROVIDE_HIDDEN(__init_array_start = .);
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KEEP(*(.init_array .ctors))
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KEEP(*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
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PROVIDE_HIDDEN (__init_array_end = .);
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}
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.fini_array :
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{
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PROVIDE_HIDDEN(__fini_array_start = .);
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KEEP(*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
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KEEP(*(.fini_array .dtors))
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PROVIDE_HIDDEN (__fini_array_end = .);
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}
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. += CONSTANT(MAXPAGESIZE);
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.bss ALIGN (4096) : AT(ADDR(.bss) - 0xC0000000)
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{
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*(COMMON)
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