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If multiple processes try to write to the console, a race condition
of sorts may occur. Similarly, if multiple processes try to read from the
console and contend with the console input buffer. One process may steal
keys from the other. Prevent this by implementing a mutex within the
console descriptor. Each time a process reads or writes the console, it
attaches itself. Any other processes attempting to read or write the
console while another is attached will be yielded to the scheduler
until the resource is free.
Signed-off-by: Ian Moffett <ian@osmora.org>
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Introduce a 'feat' field in the cons_screen structure to allow certain
console features to be turned on or off.
Signed-off-by: Ian Moffett <ian@osmora.org>
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- Flush the entire output buffer
- Wipe the whole screen with "bg"
- The entire console will now be cleared when a "\033[H" sequence is
encountered
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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- Add support for the "\033[H" ANSI escape sequence to
reset the cursor to the 'home' position
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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* Modified draw loops to use `fbdev_get_index()` less often.
* Created `cons_fast_putch()`, then used it to implement `cons_putch()`
and `cons_putstr()`. This way, when printing an entire string, the
lock acquire/release and cursor hide/show will only happen once,
instead of once per character.
* Modified `syslog_write()` to use `cons_putstr()`.
Signed-off-by: Quinn Stephens <quinn@osmora.org>
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Major console improvements
- Add console buffer framework for managing console input/output in a
more smooth and elegant manner
- Fix cursor bugs
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Was supposed to happen on Jan 1, sorry! Happy late new year!
Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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Signed-off-by: Ian Moffett <ian@osmora.org>
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