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#ifndef APOS_CAPS_H
#define APOS_CAPS_H
/**
* @file caps.h
* Capabilities of threads.
* \todo The list of capabilities should maybe be placed in some other file so
* as to easier extract it into userspace programs.
*
* @todo is it realistic to assume we will never need more than 32 capabilities?
* If so, we can remove the offset nonsense.
*/
#include <apos/bits.h>
/** Helper typedef for capabilities. */
typedef unsigned char capflags_t;
enum {
/** Thread is allowed to set capabilities of other threads. */
CAP_CAPS = (1 << 0),
/** Thread is allowed to modify process statuses, exec/fork/etc. */
CAP_PROC = (1 << 1),
/** Thread is allowed to force interrupt to callback in other thread. */
CAP_CALL = (1 << 2),
/** Thread is allowed to shut down system. */
CAP_POWER = (1 << 3),
};
/**
* Check that offset is OK.
*
* @param o Offset to check.
* @return \ref true is OK, \ref false otherwise.
*/
#define cap_off_ok(o) (o == 0)
/**
* Set capabilities.
*
* @param x Capabilities to modify.
* @param o Offset.
* @param c Capabilities to set.
*/
#define set_caps(x, o, c) set_bits(x, c)
/**
* Clear capabilities.
*
* @param x Capabilities to modify.
* @param o Offset.
* @param c Capabilities to set.
*/
#define clear_caps(x, o, c) clear_bits(x, c)
/**
* Copy capabilities.
*
* @param x Capabilities to copy to.
* @param y Capabilities to copy from.
*/
#define copy_caps(x, y) (x = y)
/**
* Get capabilities at offset \p o.
*
* @param x Capabilities to get from.
* @param o Offset to get capabilities from.
* @return Capabilities at offset \p o.
*/
#define get_caps(x, o) (x)
/**
* Check if something has capability.
*
* @param x Capabilities to check in.
* @param c Capability to check for.
* @return \ref true if \p x has \p c, \ref false otherwise.
*/
#define has_cap(x, c) (x & c)
#endif /* APOS_CAPS_H */
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