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73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
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* Copyright (c) 2011, Himanshu Chauhan. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. No personal names or organizations' names associated with the
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* Atomthreads project may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE ATOMTHREADS PROJECT AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <atomport-asm-macros.h>
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#include <atomport.h>
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#include <atom.h>
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#include <atomport-private.h>
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/** CPU frequency in MHz */
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#define CPU_FREQ_MHZ 100
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/** Number of counter counter should increase to get required ticks */
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#define COUNTER_TICK_COUNT ((1000000 * SYSTEM_TICKS_PER_SEC) / CPU_FREQ_MHZ)
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unsigned long long jiffies;
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void mips_cpu_timer_enable(void)
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{
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uint32_t sr = read_c0_status();
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sr |= ((0x1UL << 7) << 8);
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write_c0_status(sr);
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uint32_t cause = read_c0_cause();
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cause &= ~(0x1UL << 27);
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write_c0_cause(cause);
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write_c0_compare(read_c0_count() + COUNTER_TICK_COUNT);
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}
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void handle_mips_systick(void)
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{
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/* clear EXL from status */
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uint32_t sr = read_c0_status();
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sr &= ~0x00000002;
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write_c0_status(sr);
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/* Call the interrupt entry routine */
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atomIntEnter();
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/* Call the OS system tick handler */
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atomTimerTick();
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write_c0_compare(read_c0_count() + COUNTER_TICK_COUNT);
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/* Call the interrupt exit routine */
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atomIntExit(TRUE);
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}
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