Function platform_alloc

loader/tests/src/platform.c:128–154

* <!-- description --> * @brief This function allocates read/write virtual memory from the * kernel. This memory is not physically contiguous. The resulting * pointer is at least 4k aligned, so use this function sparingly * as it will always allocate at least one page. Use platform_free() * to release this memory. * * @note This function must zero the allocated memory *

 *     Returns a nullptr on failure.
 */
NODISCARD void *
platform_alloc(uint64_t const size) NOEXCEPT
{
    uint64_t mut_size = size;
    if (!bf_is_page_aligned(size)) {
        mut_size = bf_page_aligned(size + HYPERVISOR_PAGE_SIZE);
    }

    if (g_mut_platform_alloc > 0) {
        --g_mut_platform_alloc;

        if (0 == g_mut_platform_alloc) {
            return NULLPTR;
        }

        bf_touch();
    }
    else {
        bf_touch();
    }

#ifdef _WIN32
    return memset(_aligned_malloc(mut_size, HYPERVISOR_PAGE_SIZE), 0, mut_size);    // NOLINT
#else
    return memset(aligned_alloc(HYPERVISOR_PAGE_SIZE, mut_size), 0, mut_size);    // NOLINT
#endif
}

/**
 * <!-- description -->