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wip: TSS added to the gdt and start to implement scheduler

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This commit is contained in:
0x35c
2025-01-13 15:46:09 +01:00
parent 916e8b6f19
commit b9691b1948
9 changed files with 156 additions and 8 deletions
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6
headers/gdt.h
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@ -1,9 +1,10 @@
#pragma once
#include "tss.h"
#include <stdint.h>
#define GDT_ADDRESS 0xC0105040
#define GDT_SIZE 7
#define GDT_SIZE 8
// https://wiki.osdev.org/Global_Descriptor_Table#GDTR
struct gdt_descriptor {
@ -11,6 +12,8 @@ struct gdt_descriptor {
uint32_t base;
} __attribute__((packed));
extern struct tss TSS;
void init_gdt();
#define GDT_FLAG_64BIT_MODE 0b0010
@ -39,3 +42,4 @@ extern uint8_t gdt_entries[GDT_SIZE * 8];
#define GDT_OFFSET_USER_CODE 0x20
#define GDT_OFFSET_USER_DATA 0x28
#define GDT_OFFSET_USER_STACK 0x30
#define GDT_OFFSET_TSS 0x38

23
headers/task.h Normal file
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@ -0,0 +1,23 @@
#pragma once
#include "list.h"
#include <stdint.h>
enum status { ZOMBIE, THREAD, RUN };
struct task {
uint32_t *esp;
uint32_t *esp0;
uint32_t *cr3;
uint16_t pid;
uint8_t status;
struct task *daddy;
struct task *child;
struct list **signals;
uint8_t owner_id;
struct task *next;
};
void scheduler(void);
void switch_to_task(struct task *next_task);

60
headers/tss.h Normal file
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@ -0,0 +1,60 @@
#pragma once
#include <stdint.h>
// _h fields are for the offset
struct tss {
uint16_t link;
uint16_t link_h;
uint32_t esp0;
uint16_t ss0;
uint16_t ss0_h;
uint32_t esp1;
uint16_t ss1;
uint16_t ss1_h;
uint32_t esp2;
uint16_t ss2;
uint16_t ss2_h;
uint32_t cr3;
uint32_t eip;
uint32_t eflags;
uint32_t eax;
uint32_t ecx;
uint32_t edx;
uint32_t ebx;
uint32_t esp;
uint32_t ebp;
uint32_t esi;
uint32_t edi;
uint16_t es;
uint16_t es_h;
uint16_t cs;
uint16_t cs_h;
uint16_t ss;
uint16_t ss_h;
uint16_t ds;
uint16_t ds_h;
uint16_t fs;
uint16_t fs_h;
uint16_t gs;
uint16_t gs_h;
uint16_t ldt;
uint16_t ldt_h;
uint16_t trap;
uint16_t iomap;
};