diff options
Diffstat (limited to 'newlib/libc/machine/spu/spu_timer_slih.c')
| -rw-r--r-- | newlib/libc/machine/spu/spu_timer_slih.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/newlib/libc/machine/spu/spu_timer_slih.c b/newlib/libc/machine/spu/spu_timer_slih.c deleted file mode 100644 index 93cfa5ea2..000000000 --- a/newlib/libc/machine/spu/spu_timer_slih.c +++ /dev/null @@ -1,221 +0,0 @@ -/* -(C) Copyright IBM Corp. 2008 - -All rights reserved. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are met: - -* Redistributions of source code must retain the above copyright notice, -this list of conditions and the following disclaimer. -* Redistributions in binary form must reproduce the above copyright -notice, this list of conditions and the following disclaimer in the -documentation and/or other materials provided with the distribution. -* Neither the name of IBM nor the names of its contributors may be -used to endorse or promote products derived from this software without -specific prior written permission. - -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" -AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE -LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN -CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) -ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -POSSIBILITY OF SUCH DAMAGE. -*/ - -/* Second Level Interrupt handler and related services for SPU timers. */ -#include "spu_timer_internal.h" -/* Resets decrementer to the specified value. Also updates software timebase - to account for the time between the last decrementer reset and now. There - are two cases: - * Called by application to start a new timer. - * Called by spu_clock to active the next timer. - In both cases, the amount of time is the current interval timeout minus the - current decrementer value. */ -void -__reset_spu_decr (int val) -{ - - /* The interrupt occurs when the msb goes from 0 to 1 or when the decrementer - goes from 0 to -1. To be precisely accurate we should set the timer to - the intverval -1, unless the interval passed in is 0 in which case it - should be left at 0. */ - int enable_val = (__likely (val)) ? val - 1 : 0; - - /* Decrementer must be stopped before writing it - minimize the time - stopped. */ - unsigned mask = __disable_spu_decr (); - - /* Perform tb correction before resettting the decrementer. the corrected - value is the current timeout value minus the current decrementer value. - Occasionally the read returns 0 - a second read will clear this - condition. */ - int decval0 = spu_readch (SPU_RdDec); - int decval = spu_readch (SPU_RdDec); - /* Restart decrementer with next timeout val. */ - __enable_spu_decr (enable_val, mask); - - /* Update the timebase values before enabling for interrupts. */ - __spu_tb_val += __spu_tb_timeout - decval; - __spu_tb_timeout = enable_val; -} - -/* Update software timebase and timeout value for the 'next to expire' timer. - Called when starting a new timer so the timer list will have timeouts - relative to the current time. */ -static inline void -__update_spu_tb_val (void) -{ - int elapsed = __spu_tb_timeout - spu_readch (SPU_RdDec); -#ifdef SPU_TIMER_DEBUG - if (elapsed < 0) - ABORT (); -#endif - __spu_tb_val += elapsed; - - /* Adjust the timeout for the timer next to expire. Note this could cause - the timeout to go negative, if it was just about to expire when we called - spu_timer_start. This is OK, since this can happen any time interrupts - are disabled. We just schedule an immediate timeout in this case. */ - if (__spu_timers_active) - { - __spu_timers_active->tmout -= elapsed; - if (__spu_timers_active->tmout < 0) - __spu_timers_active->tmout = 0; - } -} - -/* Add an allocated timer to the active list. The active list is sorted by - timeout value. The timer at the head of the list is the timer that will - expire next. The rest of the timers have a timeout value that is relative - to the timer ahead of it on the list. This relative value is determined - here, when the timer is added to the active list. When its position in the - list is found, the timer's timeout value is set to its interval minus the - sum of all the timeout values ahead of it. The timeout value for the timer - following the newly added timer is then adjusted to a new relative value. If - the newly added timer is at the head of the list, the decrementer is reset. - This function is called by SLIH to restart multiple timers (reset == 0) or - by spu_timer_start() to start a single timer (reset == 1). */ -void -__spu_timer_start (int id, int reset) -{ - spu_timer_t *t; - spu_timer_t **pn; - spu_timer_t *start = &__spu_timers[id]; - unsigned tmout_time = 0; - unsigned my_intvl = start->intvl; - unsigned was_enabled = spu_readch (SPU_RdMachStat) & 0x1; - - spu_idisable (); - - t = __spu_timers_active; - pn = &__spu_timers_active; - - /* If the active list is empty, just add the timer with the timeout set to - the interval. Otherwise find the place in the list for the timer, setting - its timeout to its interval minus the sum of timeouts ahead of it. */ - start->state = SPU_TIMER_ACTIVE; - if (__likely (!t)) - { - __spu_timers_active = start; - start->next = NULL; - start->tmout = my_intvl; - } - else - { - - /* Update swtb and timeout val of the next timer, so all times are - relative to now. */ - if (reset) - __update_spu_tb_val (); - - while (t && (my_intvl >= (tmout_time + t->tmout))) - { - tmout_time += t->tmout; - pn = &t->next;; - t = t->next; - } - start->next = t; - start->tmout = my_intvl - tmout_time; - *pn = start; - - /* Adjust timeout for timer after us. */ - if (t) - t->tmout -= start->tmout; - } - - if (reset && (__spu_timers_active == start)) - __reset_spu_decr (__spu_timers_active->tmout); - - if (__unlikely (was_enabled)) - spu_ienable (); -} - -/* SLIH for decrementer. Manages software timebase and timers. - Called by SPU FLIH. Assumes decrementer is still running - (event not yet acknowledeged). */ -unsigned int -spu_clock_slih (unsigned status) -{ - int decr_reset_val; - spu_timer_t *active, *handled; - unsigned was_enabled = spu_readch (SPU_RdMachStat) & 0x1; - - status &= ~MFC_DECREMENTER_EVENT; - - spu_idisable (); - - /* The decrementer has now expired. The decrementer event was acknowledged - in the FLIH but not disabled. The decrementer will continue to run while - we're running the clock/timer handler. The software clock keeps running, - and accounts for all the time spent running handlers. Add the current - timeout to the software timebase and set the timeout to DECR_MAX. This - allows the "clock read" code to continue to work while we're in here, and - gives us the most possible time to finish before another underflow. */ - __spu_tb_val += __spu_tb_timeout; - __spu_tb_timeout = DECR_MAX; - - /* For all timers that have the current timeout value, move them from the - active list to the handled list and call their handlers. Note that the - handled/stopped lists may be manipulated by the handlers if they wish to - stop/free the timers. Note that only the first expired timer will reflect - the real timeout value; the rest of the timers that had the same timeout - value will have a relative value of zero. */ - if (__spu_timers_active) - { - __spu_timers_active->tmout = 0; - while ((active = __spu_timers_active) - && (active->tmout <= TIMER_INTERVAL_WINDOW)) - { - __spu_timers_active = active->next; - active->next = __spu_timers_handled; - __spu_timers_handled = active; - active->state = SPU_TIMER_HANDLED; - (*active->func) (active->id); - } - } - - /* put the handled timers back on the list and restart decrementer. */ - while ((handled = __spu_timers_handled) != NULL) - { - __spu_timers_handled = handled->next; - __spu_timer_start (handled->id, 0); - } - - /* Reset the decrementer before returning. If we have any active timers, we - set it to the timeout value for the timer at the head of the list, else - the default clock value. */ - decr_reset_val = __spu_timers_active ? __spu_timers_active->tmout : CLOCK_START_VALUE; - - __reset_spu_decr (decr_reset_val); - - if (__likely (was_enabled)) - spu_ienable (); - - return status; -} |