Function ext_main_entry

kernel/integration/fast_fail_exit_from_vmexit.cpp:215–272

    ///     microkernel speak the same ABI.
    ///
    extern "C" void
    ext_main_entry(bsl::uint32 const version) noexcept
    {
        bsl::errc_type mut_ret{};

        /// NOTE:
        /// - Initialize the bf_syscall_t. This will validate the ABI version,
        ///   open a handle to the microkernel and register the required
        ///   callbacks. If this fails, we call bf_control_op_exit, which is
        ///   similar to exit() from POSIX, except that the return value is
        ///   always the same.
        ///

        mut_ret = g_mut_sys.initialize(    // --
            bsl::to_u32(version),          // --
            &bootstrap_entry,              // --
            &vmexit_entry,                 // --
            &fail_entry);                  // --

        if (bsl::unlikely(!mut_ret)) {
            bsl::print<bsl::V>() << bsl::here();
            return bf_control_op_exit();
        }

        mut_ret = gs_initialize(g_mut_gs, g_mut_sys, g_mut_intrinsic);
        if (bsl::unlikely(!mut_ret)) {
            bsl::print<bsl::V>() << bsl::here();
            return bf_control_op_exit();
        }

        /// NOTE:
        /// - Initialize the vp_pool_t. This will give all of our vp_t's
        ///   their IDs so that they can be allocated.
        ///

        g_mut_vp_pool.initialize(g_mut_gs, g_mut_tls, g_mut_sys, g_mut_intrinsic);

        /// NOTE:
        /// - Initialize the vs_pool_t. This will give all of our vs_t's
        ///   their IDs so that they can be allocated.
        ///

        g_mut_vs_pool.initialize(g_mut_gs, g_mut_tls, g_mut_sys, g_mut_intrinsic);

        /// NOTE:
        /// - Wait for callbacks. Note that this function does not return.
        ///   The next time the extension is executed, it will be the
        ///   bootstrap callback that was just previously registered, which
        ///   will be called on each PP that is online. Failure to call this
        ///   function leads to undefined behaviour (likely a page fault).
        /// - This is similar to the wait() function from POSIX after having
        ///   just started some processes, with the difference being that
        ///   this will never return, so there is no need to pass in status
        ///   as there is nothing to process after this call.
        ///

        return bf_control_op_wait();
    }