OVMS3-idf/components/esp32/cpu_start.c

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2016-08-17 15:08:22 +00:00
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdint.h>
#include <string.h>
#include "esp_attr.h"
#include "esp_err.h"
#include "rom/ets_sys.h"
#include "soc/dport_reg.h"
#include "soc/io_mux_reg.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"
#include "freertos/portmacro.h"
#include "tcpip_adapter.h"
#include "heap_alloc_caps.h"
#include "sdkconfig.h"
#include "esp_system.h"
#include "esp_spi_flash.h"
#include "nvs_flash.h"
#include "esp_event.h"
static void IRAM_ATTR user_start_cpu0(void);
static void IRAM_ATTR call_user_start_cpu1();
static void IRAM_ATTR user_start_cpu1(void);
void Cache_Read_Enable();
extern void ets_setup_syscalls(void);
extern int __cpu1_entry_point;
extern int _bss_start;
extern int _bss_end;
extern int _init_start;
extern int _init_end;
extern int _iram_romjumptable_start;
extern int _iram_romjumptable_end;
extern int _iram_text_start;
extern int _iram_text_end;
/*
We arrive here after the bootloader finished loading the program from flash. The hardware is mostly uninitialized,
flash cache is down and the app CPU is in reset. We do have a stack, so we can do the initialization in C.
*/
void Uart_Init(int no);
void uartAttach();
void ets_set_appcpu_boot_addr(uint32_t ent);
int ets_getAppEntry();
void IRAM_ATTR call_user_start_cpu0() {
//Kill wdt
REG_CLR_BIT(0x3ff4808c, BIT(10)); //RTCCNTL+8C RTC_WDTCONFIG0 RTC_
REG_CLR_BIT(0x6001f048, BIT(14)); //DR_REG_BB_BASE+48
//Move exception vectors to IRAM
asm volatile (\
"wsr %0, vecbase\n" \
::"r"(&_init_start));
uartAttach();
ets_install_uart_printf();
//Make page 0 access raise an exception
//Also some other unused pages so we can catch weirdness
//ToDo: this but nicer.
asm volatile (\
"movi a4,0x00000000\n" \
"movi a5,0xf\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0x80000000\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0xa0000000\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0xc0000000\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0xe0000000\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0x20000000\n" \
"movi a5,0x0\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0x40000000\n" \
"movi a5,0x2\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"isync\n" \
:::"a4","a5");
memset(&_bss_start, 0, (&_bss_end - &_bss_start) * sizeof(_bss_start));
//Initialize heap allocator
heap_alloc_caps_init();
ets_printf("Pro cpu up.\n");
#ifndef CONFIG_FREERTOS_UNICORE
ets_printf("Running app cpu, entry point is %p\n", call_user_start_cpu1);
ets_delay_us(60000);
SET_PERI_REG_MASK(APPCPU_CTRL_REG_B, DPORT_APPCPU_CLKGATE_EN);
SET_PERI_REG_MASK(APPCPU_CTRL_REG_A, DPORT_APPCPU_RESETTING);
CLEAR_PERI_REG_MASK(APPCPU_CTRL_REG_A, DPORT_APPCPU_RESETTING);
for (int i=0; i<20; i++) ets_delay_us(40000);
ets_set_appcpu_boot_addr((uint32_t)call_user_start_cpu1);
ets_delay_us(10000);
// while (ets_getAppEntry()==(int)call_user_start_cpu1) ;
//Because of Reasons (tm), the pro cpu cannot use the SPI flash while the app cpu is booting.
// while(((READ_PERI_REG(RTC_STORE7))&BIT(31)) == 0) ; // check APP boot complete flag
ets_delay_us(50000);
ets_delay_us(50000);
ets_printf("\n\nBack to pro cpu.\n");
#else
CLEAR_PERI_REG_MASK(APPCPU_CTRL_REG_B, DPORT_APPCPU_CLKGATE_EN);
#endif
user_start_cpu0();
}
extern int xPortGetCoreID();
extern int _init_start;
/*
We arrive here because the pro CPU pulled us from reset. IRAM is in place, cache is still disabled, we can execute C code.
*/
void IRAM_ATTR call_user_start_cpu1() {
//We need to do this ASAP because otherwise the structure to catch the SYSCALL instruction, which
//we abuse to do ROM calls, won't work.
asm volatile (\
"wsr %0, vecbase\n" \
::"r"(&_init_start));
//Enable SPI flash
// PIN_FUNC_SELECT(PERIPHS_IO_MUX_SD_DATA3_U, FUNC_SD_DATA3_SPIWP); // swap PIN SDDATA3 from uart1 to spi, because cache need spi
ets_printf("App cpu up\n");
//Make page 0 access raise an exception
//Also some other unused pages so we can catch weirdness
//ToDo: this but nicer.
asm volatile (\
"movi a4,0x00000000\n" \
"movi a5,0xf\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0x80000000\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0xa0000000\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0xc0000000\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0xe0000000\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0x20000000\n" \
"movi a5,0x0\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"movi a4,0x40000000\n" \
"movi a5,0x2\n" \
"wdtlb a5,a4\n" \
"witlb a5,a4\n" \
"isync\n" \
:::"a4","a5");
user_start_cpu1();
}
extern volatile int port_xSchedulerRunning;
extern int xPortStartScheduler();
void user_start_cpu1(void) {
ets_printf("App cpu is running!\n");
//Wait for the freertos initialization is finished on CPU0
while (port_xSchedulerRunning == 0) ;
ets_printf("Core0 started initializing FreeRTOS. Jumping to scheduler.\n");
//Okay, start the scheduler!
xPortStartScheduler();
}
extern void (*__init_array_start)(void);
extern void (*__init_array_end)(void);
extern esp_err_t app_main();
static void do_global_ctors(void) {
void (**p)(void);
for(p = &__init_array_start; p != &__init_array_end; ++p)
(*p)();
}
void user_start_cpu0(void) {
esp_err_t ret;
ets_setup_syscalls();
do_global_ctors();
#if 1 //workaround
for (uint8_t i = 5; i < 8; i++) {
ets_printf("erase sector %d\n", i);
spi_flash_erase_sector(i);
}
#endif
ets_printf("nvs_flash_init\n");
ret = nvs_flash_init(5, 3);
if (ESP_OK != ret) {
ets_printf("nvs_flash_init fail, ret=%d\n", ret);
}
system_init();
esp_event_init(NULL);
// TODO: consider ethernet interface
#if CONFIG_WIFI_ENABLED
tcpip_adapter_init();
#endif
#if CONFIG_WIFI_ENABLED && CONFIG_WIFI_AUTO_STARTUP
#include "esp_wifi.h"
esp_wifi_startup(app_main);
#else
app_main();
#endif
vTaskStartScheduler();
}