aboutsummaryrefslogtreecommitdiff
path: root/common/uapi/timers.c
diff options
context:
space:
mode:
Diffstat (limited to 'common/uapi/timers.c')
-rw-r--r--common/uapi/timers.c120
1 files changed, 0 insertions, 120 deletions
diff --git a/common/uapi/timers.c b/common/uapi/timers.c
deleted file mode 100644
index b119fcc..0000000
--- a/common/uapi/timers.c
+++ /dev/null
@@ -1,120 +0,0 @@
-/* SPDX-License-Identifier: copyleft-next-0.3.1 */
-/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
-
-/**
- * @file timers.c
- * Timer syscall implementations.
- */
-
-#include <kmi/timer.h>
-#include <kmi/uapi.h>
-
-#include <arch/timer.h>
-
-/**
- * Convert arch-specific register values \p ticks and \p mult to \ref ticks_t.
- *
- * If we're on a 32bit system, one register can't contain a tick value,
- * so we use two registers and combine them into one value and let the compiler
- * handle the rest.
- *
- * @param ticks Register width tick value.
- * @param mult Register width repeat value.
- * @return Corresponding \ref ticks_t value.
- */
-static ticks_t scaled_ticks(sys_arg_t ticks, sys_arg_t mult)
-{
-#if defined(_LP64)
- UNUSED(mult);
- return ticks;
-#else
- return (ticks_t)ticks * (ticks_t)mult;
-#endif
-}
-
-/**
- * Timebase syscall handler.
- *
- * @param t Current tcb.
- * @return \ref OK and timebase in second argument if 64bit, otherwise high 32
- * bits of timebase in second argument and low 32 bits in third argument.
- */
-SYSCALL_DEFINE0(timebase)(struct tcb *t)
-{
- ticks_t tm = secs_to_ticks(1);
-#if defined(_LP64)
- return_args2(t, OK, tm);
-#else
- return_args3(t, OK, tm >> 32, tm);
-#endif
-}
-
-/**
- * Current ticks syscall handler.
- *
- * Note that most platforms allow user level read access to hardware timers, and
- * should be preferred over this syscall on such platforms. Still, for
- * completeness sake.
- *
- * @param t Current tcb.
- * @return \ref OK and the current ticks when on 64bit systems, otherwise high
- * 32 bits of ticks in second argument and low 32 bits in third.
- */
-SYSCALL_DEFINE0(ticks)(struct tcb *t)
-{
- ticks_t tm = current_ticks();
-#if defined(_LP64)
- return_args2(t, OK, tm);
-#else
- return_args3(t, OK, tm >> 32, tm);
-#endif
-}
-
-/**
- * Relative timer request syscall handler.
- *
- * \note On 64bit systems, \p mult is ignored as \p ticks register is large
- * enough to contain essentially any timepoint we want. A couple thousand years
- * when the clock runs at 5GHz, if I'm not completely mistaken.
- *
- * @param t Current tcb.
- * @param ticks Number of ticks from now.
- * @param mult Multiply \c ticks by this value.
- * @return \ref OK and \c cid of created timer.
- */
-SYSCALL_DEFINE2(req_rel_timer)(struct tcb *t, sys_arg_t ticks, sys_arg_t mult)
-{
- return_args2(t, OK, new_rel_timer(t->tid, scaled_ticks(ticks, mult)));
-}
-
-/**
- * Absolute timer request syscall handler.
- *
- * @param t Current tcb.
- * @param ticks Absolute timepoint relative to some start point defined at boot.
- * @param mult Multiply \c ticks by this value.
- * @return \ref OK and \c cid of created timer.
- * \see req_rel_timer().
- */
-SYSCALL_DEFINE2(req_abs_timer)(struct tcb *t, sys_arg_t ticks, sys_arg_t mult)
-{
- return_args2(t, OK, new_abs_timer(t->tid, scaled_ticks(ticks, mult)));
-}
-
-/**
- * Free timer request syscall handler.
- *
- * @param t Current tcb.
- * @param cid \c cid of timer to free.
- * @return \ref ERR_NF and \c 0if no timer could be found with \c cid, \ref OK
- * and 0 otherwise.
- */
-SYSCALL_DEFINE1(free_timer)(struct tcb *t, sys_arg_t cid)
-{
- struct timer *timer = find_timer(cid);
- if (!timer)
- return_args1(t, ERR_NF);
-
- remove_timer(timer);
- return_args1(t, OK);
-}