Struct capsules_extra::screen::Screen

pub struct Screen<'a> { /* private fields */ }

Implementations

impl<'a> Screen<'a>

pub fn new( screen: &'a dyn Screen<'a>, screen_setup: Option<&'a dyn ScreenSetup<'a>>, buffer: &'static mut [u8], grant: Grant<App, UpcallCount<1>, AllowRoCount<{ ro_allow::COUNT }>, AllowRwCount<0>> ) -> Screen<'a>

Trait Implementations

impl<'a> ScreenClient for Screen<'a>

fn command_complete(&self, r: Result<(), ErrorCode>)

The screen will call this function to notify that a command (except write) has finished.

fn write_complete( &self, data: SubSliceMut<'static, u8>, r: Result<(), ErrorCode> )

The screen will call this function to notify that the write command has finished. This is different from command_complete as it has to pass back the write buffer

fn screen_is_ready(&self)

Some screens need some time to start, this function is called when the screen is ready.

impl<'a> ScreenSetupClient for Screen<'a>

fn command_complete(&self, r: Result<(), ErrorCode>)

The screen will call this function to notify that a command has finished.

impl<'a> SyscallDriver for Screen<'a>

fn command( &self, command_num: usize, data1: usize, data2: usize, process_id: ProcessId ) -> CommandReturn

System call for a process to perform a short synchronous operation or start a long-running split-phase operation (whose completion is signaled with an upcall). Command 0 is a reserved command to detect if a peripheral system call driver is installed and must always return a CommandReturn::Success.

fn allocate_grant(&self, processid: ProcessId) -> Result<(), Error>

Request to allocate a capsule’s grant for a specific process.

fn allow_userspace_readable( &self, app: ProcessId, which: usize, slice: ReadWriteProcessBuffer ) -> Result<ReadWriteProcessBuffer, (ReadWriteProcessBuffer, ErrorCode)>

System call for a process to pass a buffer (a UserspaceReadableProcessBuffer) to the kernel that the kernel can either read or write. The kernel calls this method only after it checks that the entire buffer is within memory the process can both read and write.