87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
|
|
* Copyright (c) 2017 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/* Include esp-idf headers first to avoid redefining BIT() macro */
|
|
#include "soc.h"
|
|
#include <soc/rtc_cntl_reg.h>
|
|
#include <soc/timer_group_reg.h>
|
|
#include <xtensa/config/core-isa.h>
|
|
#include <xtensa/corebits.h>
|
|
|
|
#include <kernel_structs.h>
|
|
#include <string.h>
|
|
#include <toolchain/gcc.h>
|
|
#include <zephyr/types.h>
|
|
|
|
extern void z_cstart(void);
|
|
|
|
/*
|
|
* This is written in C rather than assembly since, during the port bring up,
|
|
* Zephyr is being booted by the Espressif bootloader. With it, the C stack
|
|
* is already set up.
|
|
*/
|
|
void __attribute__((section(".iram1"))) __start(void)
|
|
{
|
|
volatile u32_t *wdt_rtc_reg = (u32_t *)RTC_CNTL_WDTCONFIG0_REG;
|
|
volatile u32_t *wdt_timg_reg = (u32_t *)TIMG_WDTCONFIG0_REG(0);
|
|
volatile u32_t *app_cpu_config_reg = (u32_t *)DPORT_APPCPU_CTRL_B_REG;
|
|
extern u32_t _init_start;
|
|
extern u32_t _bss_start;
|
|
extern u32_t _bss_end;
|
|
|
|
/* Move the exception vector table to IRAM. */
|
|
__asm__ __volatile__ (
|
|
"wsr %0, vecbase"
|
|
:
|
|
: "r"(&_init_start));
|
|
|
|
/* Zero out BSS. Clobber _bss_start to avoid memset() elision. */
|
|
(void)memset(&_bss_start, 0,
|
|
(&_bss_end - &_bss_start) * sizeof(_bss_start));
|
|
__asm__ __volatile__ (
|
|
""
|
|
:
|
|
: "g"(&_bss_start)
|
|
: "memory");
|
|
|
|
/* The watchdog timer is enabled in the bootloader. We're done booting,
|
|
* so disable it.
|
|
*/
|
|
*wdt_rtc_reg &= ~RTC_CNTL_WDT_FLASHBOOT_MOD_EN;
|
|
*wdt_timg_reg &= ~TIMG_WDT_FLASHBOOT_MOD_EN;
|
|
|
|
/* Disable normal interrupts. */
|
|
__asm__ __volatile__ (
|
|
"wsr %0, PS"
|
|
:
|
|
: "r"(PS_INTLEVEL(XCHAL_EXCM_LEVEL) | PS_UM | PS_WOE));
|
|
|
|
/* Disable CPU1 while we figure out how to have SMP in Zephyr. */
|
|
*app_cpu_config_reg &= ~DPORT_APPCPU_CLKGATE_EN;
|
|
|
|
/* Initialize the architecture CPU pointer. Some of the
|
|
* initialization code wants a valid _current before
|
|
* arch_kernel_init() is invoked.
|
|
*/
|
|
__asm__ volatile("wsr.MISC0 %0; rsync" : : "r"(&_kernel.cpus[0]));
|
|
|
|
|
|
/* Start Zephyr */
|
|
z_cstart();
|
|
|
|
CODE_UNREACHABLE;
|
|
}
|
|
|
|
/* Boot-time static default printk handler, possibly to be overridden later. */
|
|
int arch_printk_char_out(int c)
|
|
{
|
|
if (c == '\n') {
|
|
esp32_rom_uart_tx_one_char('\r');
|
|
}
|
|
esp32_rom_uart_tx_one_char(c);
|
|
return 0;
|
|
}
|