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24b7296319
Provide an internal syslog() function (unrelated to the syslog console) which can be used to create log messages with specified priorities. The build-time constant LOG_LEVEL can be used to select the minimum required priority for log messages. Any messages that do not have a sufficient priority will be ignored (and will be optimised away at compile-time). The default LOG_LEVEL is LOG_NONE. Signed-off-by: Michael Brown <mcb30@ipxe.org>
164 lines
3.5 KiB
C
164 lines
3.5 KiB
C
#ifndef _IPXE_CONSOLE_H
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#define _IPXE_CONSOLE_H
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#include <stdio.h>
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#include <ipxe/tables.h>
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/** @file
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*
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* User interaction.
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*
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* Various console devices can be selected via the build options
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* CONSOLE_FIRMWARE, CONSOLE_SERIAL etc. The console functions
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* putchar(), getchar() and iskey() delegate to the individual console
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* drivers.
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/**
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* A console driver
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*
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* Defines the functions that implement a particular console type.
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* Must be made part of the console drivers table by using
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* #__console_driver.
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*
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* @note Consoles that cannot be used before their initialisation
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* function has completed should set #disabled=1 initially. This
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* allows other console devices to still be used to print out early
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* debugging messages.
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*
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*/
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struct console_driver {
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/** Console is disabled.
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*
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* The console's putchar(), getchar() and iskey() methods will
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* not be called while #disabled==1. Typically the console's
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* initialisation functions will set #disabled=0 upon
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* completion.
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*
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*/
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int disabled;
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/** Write a character to the console.
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*
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* @v character Character to be written
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* @ret None -
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* @err None -
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*
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*/
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void ( *putchar ) ( int character );
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/** Read a character from the console.
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*
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* @v None -
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* @ret character Character read
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* @err None -
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*
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* If no character is available to be read, this method will
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* block. The character read should not be echoed back to the
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* console.
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*
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*/
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int ( *getchar ) ( void );
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/** Check for available input.
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*
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* @v None -
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* @ret True Input is available
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* @ret False Input is not available
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* @err None -
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*
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* This should return True if a subsequent call to getchar()
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* will not block.
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*
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*/
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int ( *iskey ) ( void );
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/** Console usage bitmask
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*
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* This is the bitwise OR of zero or more @c CONSOLE_USAGE_XXX
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* values.
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*/
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int usage;
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};
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/** Console driver table */
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#define CONSOLES __table ( struct console_driver, "consoles" )
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/**
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* Mark a <tt> struct console_driver </tt> as being part of the
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* console drivers table.
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*
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* Use as e.g.
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*
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* @code
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*
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* struct console_driver my_console __console_driver = {
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* .putchar = my_putchar,
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* .getchar = my_getchar,
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* .iskey = my_iskey,
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* };
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*
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* @endcode
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*
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*/
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#define __console_driver __table_entry ( CONSOLES, 01 )
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/**
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* @defgroup consoleusage Console usages
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* @{
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*/
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/** Standard output */
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#define CONSOLE_USAGE_STDOUT 0x0001
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/** Debug messages */
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#define CONSOLE_USAGE_DEBUG 0x0002
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/** Text-based user interface */
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#define CONSOLE_USAGE_TUI 0x0004
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/** Log messages */
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#define CONSOLE_USAGE_LOG 0x0008
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/** All console usages */
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#define CONSOLE_USAGE_ALL ( CONSOLE_USAGE_STDOUT | CONSOLE_USAGE_DEBUG | \
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CONSOLE_USAGE_TUI | CONSOLE_USAGE_LOG )
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/** @} */
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/**
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* Test to see if console has an explicit usage
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*
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* @v console Console definition (e.g. CONSOLE_PCBIOS)
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* @ret explicit Console has an explicit usage
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*
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* This relies upon the trick that the expression ( 2 * N + 1 ) will
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* be valid even if N is defined to be empty, since it will then
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* evaluate to give ( 2 * + 1 ) == ( 2 * +1 ) == 2.
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*/
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#define CONSOLE_EXPLICIT( console ) ( ( 2 * console + 1 ) != 2 )
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extern int console_usage;
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/**
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* Set console usage
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*
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* @v usage New console usage
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* @ret old_usage Previous console usage
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*/
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static inline __attribute__ (( always_inline )) int
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console_set_usage ( int usage ) {
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int old_usage = console_usage;
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console_usage = usage;
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return old_usage;
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}
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extern int iskey ( void );
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extern int getkey ( unsigned long timeout );
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#endif /* _IPXE_CONSOLE_H */
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