diff options
Diffstat (limited to 'libgloss/sparc_leon/kernel.c')
| -rw-r--r-- | libgloss/sparc_leon/kernel.c | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/libgloss/sparc_leon/kernel.c b/libgloss/sparc_leon/kernel.c deleted file mode 100644 index ecdeb219c..000000000 --- a/libgloss/sparc_leon/kernel.c +++ /dev/null @@ -1,217 +0,0 @@ -/* - * Copyright (c) 2011 Aeroflex Gaisler - * - * BSD license: - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ - - -#include <asm-leon/contextswitch.h> -#include <asm-leon/leonbare_kernel.h> -#include <asm-leon/leonbare_debug.h> -#include <asm-leon/stack.h> -#include <asm-leon/leonstack.h> -#include <asm-leon/irq.h> - -struct leonbare_kernel leonbare_kernel; - -/* - * queue 0: [ <acc=2>], - * queue 1: [ <acc=10>, <acc=8>,<acc=8>,<acc=1> ], - * queue 2: [ ... ], - * ... - * queue n: [ ... ] - * - * Seach through ready queue [0 - LEONBARE_RUNQ_READY_NR-1] for the - * first thread in a queue'ss head to discover - * leonbare_thread_tick_callback() will put threads that have their th_caccount - * consumed into the prepare-run queues. th_caccount is already initialized - * to the value for the next schedule round. So all there is to do is to - * move the to prepare-run queues to run queues [0 - LEONBARE_RUNQ_READY_NR-1]. - * return the first thread in any queue, similary to leonbare_sched_next(). - * Using LEONBARE_KR_RUNQ_WHICH and leonbare_thread.th_runq_which one can - * determine weather the thread is in a runqueue or a prepare-runqueue: - * LEONBARE_KR_RUNQ_WHICH == leonbare_thread.th_runq_which : thread in runqueue - * LEONBARE_KR_RUNQ_WHICH != leonbare_thread.th_runq_which : thread in prepare-runqueue - * after a leonbare_thread_tick_callback() or a run queue change, call - * leonbare_sched_update() to update LEONBARE_KR_NEXT and - * LEONBARE_KR_NEED_SCHEDULE - */ -int -leonbare_sched_update () -{ - int idx; - leonbare_thread_t n = 0; - int i = 0; - LEONBARE_VERIFYIRQDISABLED (); - LEONBARE_VERIFYSCHED (); - for (i = 0; i < LEONBARE_RUNQ_READY_NR; i++) - { - leonbare_thread_t c; - if (!LBTAILQ_EMPTY (LEONBARE_KR_RUNQ (i))) - { - n = LBTAILQ_FIRST (LEONBARE_KR_RUNQ (i)); - break; - } - } - if (!n) - { - for (idx = 0; idx < LEONBARE_RUNQ_READY_NR; idx++) - { - struct leonbare_thread_queue *h0 = - (struct leonbare_thread_queue *) LEONBARE_KR_RUNQ (idx); - struct leonbare_thread_queue *h1 = (struct leonbare_thread_queue *) - LEONBARE_KR_RUNQ (idx + LEONBARE_RUNQ_PREPARE_IDX); - if (LBTAILQ_EMPTY (h1)) - { - LBTAILQ_INIT (h0); - } - else - { - *h0 = *h1; - if (LBTAILQ_FIRST (h0)) - { - LBTAILQ_FIRST (h0)->th_runq.tqe_prev = &(h0)->tqh_first; - } - if (!n) - { - n = LBTAILQ_FIRST (h0); - } - } - } - for (idx = 0; idx < LEONBARE_RUNQ_READY_NR; idx++) - { - LBTAILQ_INIT (LEONBARE_KR_RUNQ (idx + LEONBARE_RUNQ_PREPARE_IDX)); - } - LEONBARE_KR_RUNQ_WHICH++; - LEONBARE_VERIFYSCHED (); - LEONBARE_PRINTQUEUES (); - } - LEONBARE_KR_NEXT = n; - return (LEONBARE_KR_NEED_SCHEDULE); -} - -/* called in the timer irq handling. Decrements the - * th_caccount field. On consumption of th_caccount the - * thread will be removed from the ready queue nad placed into the - * prepare-runqueue for later readdition by leonbare_sched_readyprepare() - * called from gettimeofday.c's installed ticker_callback callback - * leonbare_thread_tick_callback() might change the kernel state in which case - * state on return from leonbare_thread_tick_callback() leonbare_thread_schedule_callback() - * will be called from rtrap_fast.S . - */ -int -leonbare_thread_tick_callback () -{ - LEONBARE_PROTECT_DECL (flags); - unsigned int r; - volatile leonbare_thread_t c = LEONBARE_KR_CURRENT; - leonbare_thread_t i; - LBDEBUG_FNCALL; - if (c && LEONBARE_KR_IS_PREEMPTION) - { - - LEONBARE_PROTECT_KERNEL_START (); - { - - LEONBARE_VERIFYIRQDISABLED (); - LEONBARE_VERIFYSCHED (); - - if ((--c->th_caccount) < 0) - { - LBDEBUG_HEADER_PRINTF (LBDEBUG_QUEUE_NR, "remove %s(%x)\n", - LEONBARE_TH_NAME_DBG (c), c); - LBTAILQ_REMOVE (LEONBARE_KR_RUNQ (c->th_runq_idx), c, th_runq); - LBTAILQ_INSERT_TAIL (LEONBARE_KR_RUNQ - (c->th_runq_idx + LEONBARE_RUNQ_PREPARE_IDX), - c, th_runq); - c->th_caccount = c->th_account; - c->th_runq_which++; - } - else - { - /* todo: round robbin scheme */ - } - } - LEONBARE_PROTECT_KERNEL_END (); - } - r = leonbare_sched_update (); - return r; -} - -/* called from rtrap_fast.S's installed schedule_callback callback */ -int -leonbare_thread_schedule_callback (struct leonbare_pt_regs *ptregs) -{ - unsigned int retval; - LBDEBUG_FNCALL; - if (LEONBARE_KR_IS_IN_KERNEL == 0 && LEONBARE_KR_NEED_SCHEDULE) - { - - leonbare_sched (); - - //KERNEL_ENTER; - //KERNEL_EXIT(LEONBARE_KR_NEED_SCHEDULE, retval); - } - LBDEBUG_FNEXIT; -} - - -struct leonbare_thread _thread_main; -int -leonbare_thread_init () -{ - int i; - LBDEBUG_FNCALL; - - memset ((void *) &_thread_main, 0, sizeof (_thread_main)); - _thread_main.th_reentp = _impure_ptr; - _thread_main.th_name = "<main>"; - _thread_main.th_runq_idx = 0; - _thread_main.th_pri_idx = 0; - _thread_main.th_account = 0; - - LBTAILQ_INIT (LEONBARE_KR_ALLQ); - for (i = 0; i < LEONBARE_RUNQ_NR; i++) - { - LBTAILQ_INIT (LEONBARE_KR_RUNQ (i)); - } - LBTAILQ_INIT (LEONBARE_KR_ALLM); - - /* queues */ - LBTAILQ_INSERT_TAIL (LEONBARE_KR_ALLQ, &_thread_main, th_allq); - - /* inseart into ready queue 0 at head */ - LBTAILQ_INSERT_HEAD (LEONBARE_KR_RUNQ (_thread_main.th_runq_idx), - &_thread_main, th_runq); - - LEONBARE_KR_CURRENT = &_thread_main; - LEONBARE_KR_IS_IN_KERNEL = 0; - - leonbare_init_ticks (); - schedule_callback = (schedulehandler) leonbare_thread_schedule_callback; - ticker_callback = (tickerhandler) leonbare_thread_tick_callback; - - /* disable later */ - LEONBARE_KR_IS_PREEMPTION = 1; - - - LBDEBUG_FNEXIT; -} |