#define _LUNA_SYSTEM_ERROR_EXTENSIONS
#include <bits/errno-return.h>
#include <luna/Heap.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <unistd.h>

extern "C"
{
    void* mmap(void* addr, size_t len, int prot, int flags, int, off_t)
    {
        long rc = syscall(SYS_mmap, addr, len, prot, flags);
        __errno_return(rc, void*);
    }

    int munmap(void* addr, size_t len)
    {
        long rc = syscall(SYS_munmap, addr, len);
        __errno_return(rc, int);
    }
}

Result<void*> allocate_pages_impl(usize count)
{
    long rc = syscall(SYS_mmap, nullptr, count * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS);
    if (rc < 0) { return err((int)-rc); }
    return (void*)rc;
}

Result<void> release_pages_impl(void* address, usize count)
{
    long rc = syscall(SYS_munmap, address, count * PAGE_SIZE);
    if (rc < 0) { return err((int)-rc); }
    return {};
}