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Diffstat (limited to 'gpxe/src/core/console.c')
-rw-r--r-- | gpxe/src/core/console.c | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/gpxe/src/core/console.c b/gpxe/src/core/console.c deleted file mode 100644 index e22d2601..00000000 --- a/gpxe/src/core/console.c +++ /dev/null @@ -1,130 +0,0 @@ -#include "stddef.h" -#include "console.h" -#include <gpxe/process.h> -#include <gpxe/nap.h> - -/** @file */ - -FILE_LICENCE ( GPL2_OR_LATER ); - -/** - * Write a single character to each console device. - * - * @v character Character to be written - * @ret None - - * @err None - - * - * The character is written out to all enabled console devices, using - * each device's console_driver::putchar() method. - * - */ -void putchar ( int character ) { - struct console_driver *console; - - /* Automatic LF -> CR,LF translation */ - if ( character == '\n' ) - putchar ( '\r' ); - - for_each_table_entry ( console, CONSOLES ) { - if ( ( ! console->disabled ) && console->putchar ) - console->putchar ( character ); - } -} - -/** - * Check to see if any input is available on any console. - * - * @v None - - * @ret console Console device that has input available, if any. - * @ret NULL No console device has input available. - * @err None - - * - * All enabled console devices are checked once for available input - * using each device's console_driver::iskey() method. The first - * console device that has available input will be returned, if any. - * - */ -static struct console_driver * has_input ( void ) { - struct console_driver *console; - - for_each_table_entry ( console, CONSOLES ) { - if ( ( ! console->disabled ) && console->iskey ) { - if ( console->iskey () ) - return console; - } - } - return NULL; -} - -/** - * Read a single character from any console. - * - * @v None - - * @ret character Character read from a console. - * @err None - - * - * A character will be read from the first enabled console device that - * has input available using that console's console_driver::getchar() - * method. If no console has input available to be read, this method - * will block. To perform a non-blocking read, use something like - * - * @code - * - * int key = iskey() ? getchar() : -1; - * - * @endcode - * - * The character read will not be echoed back to any console. - * - */ -int getchar ( void ) { - struct console_driver *console; - int character; - - while ( 1 ) { - console = has_input(); - if ( console && console->getchar ) { - character = console->getchar (); - break; - } - - /* Doze for a while (until the next interrupt). This works - * fine, because the keyboard is interrupt-driven, and the - * timer interrupt (approx. every 50msec) takes care of the - * serial port, which is read by polling. This reduces the - * power dissipation of a modern CPU considerably, and also - * makes Etherboot waiting for user interaction waste a lot - * less CPU time in a VMware session. - */ - cpu_nap(); - - /* Keep processing background tasks while we wait for - * input. - */ - step(); - } - - /* CR -> LF translation */ - if ( character == '\r' ) - character = '\n'; - - return character; -} - -/** Check for available input on any console. - * - * @v None - - * @ret True Input is available on a console - * @ret False Input is not available on any console - * @err None - - * - * All enabled console devices are checked once for available input - * using each device's console_driver::iskey() method. If any console - * device has input available, this call will return True. If this - * call returns True, you can then safely call getchar() without - * blocking. - * - */ -int iskey ( void ) { - return has_input() ? 1 : 0; -} |