Changeset d5b37b6 in mainline for kernel/generic/include/console/console.h

Timestamp:

2025-04-17T15:14:03Z (5 days ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master

Children:

690ad20

Parents:

571cc2d

git-author:

Jiří Zárevúcky <zarevucky.jiri@…> (2025-04-11 17:35:09)

git-committer:

Jiří Zárevúcky <zarevucky.jiri@…> (2025-04-17 15:14:03)

Message:

Use a new syscall, SYS_KIO_READ, for reading from KIO buffer

Originally, the buffer memory was shared between kernel and
uspace, presumably to avoid the overhead of syscalls.
However, this makes synchronization with kernel impossible,
so it is not possible to ensure it works reliably without
random glitches. Also, relative to everything else /app/kio
does with the data, the syscall overhead is positively tiny.

File:

• kernel/generic/include/console/console.h (modified) (2 diffs)

kernel/generic/include/console/console.h

@@ -36 +36 @@
 #define KERN_CONSOLE_H_
 
-#include <typedefs.h>
-#include <print.h>
 #include <console/chardev.h>
 #include <synch/spinlock.h>
@@ -69 +67 @@
 extern irq_spinlock_t kio_lock;
 
+extern sysarg_t sys_kio_read(uspace_addr_t buf, size_t size, size_t at);
 extern sys_errno_t sys_kio(int cmd, uspace_addr_t buf, size_t size);