Luna/kernel/src/interrupts/Interrupts.cpp

#include "interrupts/Interrupts.h"
#include "trace/StackTracer.h"
#include "utils/Registers.h"

void Interrupts::disable()
{
    asm volatile("cli");
}

void Interrupts::enable()
{
    asm volatile("sti");
}

extern int _asm_interrupt_exit;

bool Interrupts::is_in_handler()
{
    return stack_trace_contains((uintptr_t)&_asm_interrupt_exit);
}

void Interrupts::return_from_handler(Context* context)
{
    asm volatile("mov %0, %%rsp\n"
                 "jmp _asm_interrupt_exit"
                 :
                 : "r"(context));
}

bool Interrupts::are_enabled()
{
    return (read_rflags() & 0x200) > 0;
}

static bool saved_interrupt_state;

void Interrupts::push_and_disable()
{
    saved_interrupt_state = are_enabled();
    disable();
}

void Interrupts::push_and_enable()
{
    saved_interrupt_state = are_enabled();
    enable();
}

void Interrupts::pop()
{
    if (saved_interrupt_state && !are_enabled()) enable();
    else if (!saved_interrupt_state && are_enabled())
        disable();
}

bool Interrupts::were_enabled()
{
    return saved_interrupt_state;
}