Luna/kernel/include/misc/utils.h

#pragma once
#include <stdint.h>

#ifndef PAGE_SIZE
#define PAGE_SIZE 4096
#endif

extern "C" uint64_t asm_get_rflags();

namespace Utilities
{
    inline uint64_t get_blocks_from_size(uint64_t blocksize, uint64_t size)
    {
        return (size + (blocksize - 1)) / blocksize;
    }

    inline uint64_t get_rflags()
    {
        return asm_get_rflags();
    }

    inline uint64_t get_top_of_stack(uint64_t bottom, uint64_t stack_pages)
    {
        return bottom + (stack_pages * PAGE_SIZE) - sizeof(uintptr_t);
    }

    inline uint64_t round_down_to_nearest_page(uint64_t addr)
    {
        return addr - (addr % PAGE_SIZE);
    }

    inline uint64_t round_up_to_nearest_page(uint64_t addr)
    {
        if (addr % PAGE_SIZE) return addr + (PAGE_SIZE - (addr % PAGE_SIZE));
        return addr;
    }
}