#include "thread/Thread.h"
#include <luna/CString.h>

bool is_in_kernel(Registers* regs)
{
    return regs->cs == 8;
}

void Thread::set_ip(u64 ip)
{
    regs.rip = ip;
}

u64 Thread::ip()
{
    return regs.rip;
}

void Thread::set_sp(u64 sp)
{
    regs.rsp = sp;
}

u64 Thread::sp()
{
    return regs.rsp;
}

void Thread::init_regs_kernel()
{
    memset(&regs, 0, sizeof(Registers));
    regs.cs = 0x08;
    regs.ss = 0x10;
    regs.rflags = 1 << 9; // IF (Interrupt enable flag)
}

void Thread::init_regs_user()
{
    memset(&regs, 0, sizeof(Registers));
    regs.cs = 0x18 | 3;
    regs.ss = 0x20 | 3;
    regs.rflags = 1 << 9; // IF (Interrupt enable flag)
}

void Thread::set_arguments(u64 arg1, u64 arg2, u64 arg3, u64 arg4)
{
    regs.rdi = arg1;
    regs.rsi = arg2;
    regs.rdx = arg3;
    regs.rcx = arg4;
}

void switch_context(Thread* old_thread, Thread* new_thread, Registers* regs)
{
    if (!old_thread->is_idle()) memcpy(&old_thread->regs, regs, sizeof(Registers));

    memcpy(regs, &new_thread->regs, sizeof(Registers));
}