Luna/kernel/src/memory/Memory.cpp

#include "memory/Memory.h"
#include "bootboot.h"

extern BOOTBOOT bootboot;

uint64_t Memory::get_system()
{
    static uint64_t result = 0;
    static bool cached = false;

    if (cached) return result;

    MMapEnt* ptr = &bootboot.mmap;
    uint64_t mmap_entries = (bootboot.size - 128) / 16;
    for (uint64_t i = 0; i < mmap_entries; i++)
    {
        result += MMapEnt_Size(ptr);
        ptr++;
    }

    cached = true;

    return result;
}

uint64_t Memory::get_usable()
{
    static uint64_t result = 0;
    static bool cached = false;

    if (cached) return result;

    MMapEnt* ptr = &bootboot.mmap;
    uint64_t mmap_entries = (bootboot.size - 128) / 16;
    for (uint64_t i = 0; i < mmap_entries; i++)
    {
        if (MMapEnt_IsFree(ptr)) result += MMapEnt_Size(ptr);
        ptr++;
    }

    cached = true;

    return result;
}

bool Memory::is_kernel_address(uintptr_t address)
{
    return address >= 0xfffffffff8000000;
}

bool Memory::is_user_address(uintptr_t address)
{
    return address && address < 0xfffffffff8000000;
}