BarinkOS/kernel/memory/TaskStateSegment.h
Nigel dea8ab7d71 Improved build system
Added new entries to .gitignore
Moved away from source directory as central spot for all source code
2023-02-20 00:29:06 +01:00

61 lines
1.2 KiB
C

#pragma once
#include "gdt/gdtc.h"
#include <CoreLib/Memory.h>
struct TaskStateSegment {
uint32_t prev_tss;
uint32_t esp0;
uint32_t ss0;
// everythinge else is unused
uint32_t esp1;
uint32_t ss1;
uint32_t esp2;
uint32_t ss2;
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;
uint32_t es;
uint32_t cs;
uint32_t ss;
uint32_t ds;
uint32_t fs;
uint32_t gs;
uint32_t ldt;
uint16_t trap;
uint16_t iomap_base;
}__attribute__((packed));
TaskStateSegment tss0 ={};
inline void flush_tss()
{
asm volatile("mov $0x2B, %ax ; ltr %ax");
}
void setup_tss(){
// ensure the tss is zero'd
memset((void*)&tss0, 0, sizeof(tss0));
tss0.ss0 = (uint32_t) &GlobalDescriptorTable[KERNEL_DATA_SEGMENT];
extern uint32_t stack_top;
tss0.esp0 = (unsigned long)&stack_top;
// Task Segment Descriptor
uint32_t address = (unsigned long) &tss0;
uint32_t size = sizeof(tss0);
uint32_t limit = (address + size );
add_descriptor(TASK_STATE_SEGMENT, address, limit- 1, 0xE9, 0x0);
}