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105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdint.h>
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#include <string.h>
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#include "esp_attr.h"
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#include "esp_err.h"
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#include "esp_intr_alloc.h"
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#include "esp32s2beta/rom/ets_sys.h"
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#include "esp32s2beta/rom/uart.h"
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#include "soc/cpu.h"
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#include "soc/dport_reg.h"
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#include "soc/io_mux_reg.h"
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#include "soc/rtc_cntl_reg.h"
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#include "soc/periph_defs.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/semphr.h"
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#include "freertos/queue.h"
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#include "freertos/portmacro.h"
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#define REASON_YIELD BIT(0)
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#define REASON_FREQ_SWITCH BIT(1)
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static portMUX_TYPE reason_spinlock = portMUX_INITIALIZER_UNLOCKED;
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static volatile uint32_t reason;
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/*
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ToDo: There is a small chance the CPU already has yielded when this ISR is serviced. In that case, it's running the intended task but
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the ISR will cause it to switch _away_ from it. portYIELD_FROM_ISR will probably just schedule the task again, but have to check that.
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*/
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static inline void IRAM_ATTR esp_crosscore_isr_handle_yield(void)
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{
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portYIELD_FROM_ISR();
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}
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static void IRAM_ATTR esp_crosscore_isr(void *arg) {
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uint32_t my_reason_val;
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//A pointer to the correct reason item is passed to this ISR.
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volatile uint32_t *my_reason=arg;
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//Clear the interrupt first.
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DPORT_WRITE_PERI_REG(DPORT_CPU_INTR_FROM_CPU_0_REG, 0);
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//Grab the reason and clear it.
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portENTER_CRITICAL_ISR(&reason_spinlock);
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my_reason_val=*my_reason;
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*my_reason=0;
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portEXIT_CRITICAL_ISR(&reason_spinlock);
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//Check what we need to do.
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if (my_reason_val & REASON_YIELD) {
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esp_crosscore_isr_handle_yield();
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}
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if (my_reason_val & REASON_FREQ_SWITCH) {
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/* Nothing to do here; the frequency switch event was already
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* handled by a hook in xtensa_vectors.S. Could be used in the future
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* to allow DFS features without the extra latency of the ISR hook.
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*/
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}
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}
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//Initialize the crosscore interrupt on this core.
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void esp_crosscore_int_init(void) {
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portENTER_CRITICAL(&reason_spinlock);
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reason = 0;
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portEXIT_CRITICAL(&reason_spinlock);
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ESP_ERROR_CHECK(esp_intr_alloc(ETS_FROM_CPU_INTR0_SOURCE, ESP_INTR_FLAG_IRAM, esp_crosscore_isr, (void*)&reason, NULL));
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}
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static void IRAM_ATTR esp_crosscore_int_send(int core_id, uint32_t reason_mask) {
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assert(core_id<portNUM_PROCESSORS);
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//Mark the reason we interrupt the current CPU
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portENTER_CRITICAL(&reason_spinlock);
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reason |= reason_mask;
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portEXIT_CRITICAL(&reason_spinlock);
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//Poke the current CPU.
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DPORT_WRITE_PERI_REG(DPORT_CPU_INTR_FROM_CPU_0_REG, DPORT_CPU_INTR_FROM_CPU_0);
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}
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void IRAM_ATTR esp_crosscore_int_send_yield(int core_id)
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{
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esp_crosscore_int_send(core_id, REASON_YIELD);
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}
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void IRAM_ATTR esp_crosscore_int_send_freq_switch(int core_id)
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{
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esp_crosscore_int_send(core_id, REASON_FREQ_SWITCH);
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}
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