Struct capsules_extra::text_screen::TextScreen

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

Implementations

impl<'a> TextScreen<'a>

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

Trait Implementations

impl<'a> SyscallDriver for TextScreen<'a>

fn command( &self, command_num: usize, data1: usize, data2: usize, processid: 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.

impl<'a> TextScreenClient for TextScreen<'a>

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

The driver calls this function when any command (but a write one) finishes executing.

fn write_complete( &self, buffer: &'static mut [u8], len: usize, r: Result<(), ErrorCode>, )

The driver calls this function when a write command finishes executing.