87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* Copyright (c) 2017 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* Include esp-idf headers first to avoid redefining BIT() macro */
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#include "soc.h"
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#include <soc/rtc_cntl_reg.h>
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#include <soc/timer_group_reg.h>
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#include <xtensa/config/core-isa.h>
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#include <xtensa/corebits.h>
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#include <kernel_structs.h>
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#include <string.h>
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#include <toolchain/gcc.h>
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#include <zephyr/types.h>
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extern void z_cstart(void);
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/*
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* This is written in C rather than assembly since, during the port bring up,
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* Zephyr is being booted by the Espressif bootloader. With it, the C stack
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* is already set up.
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*/
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void __attribute__((section(".iram1"))) __start(void)
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{
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volatile uint32_t *wdt_rtc_reg = (uint32_t *)RTC_CNTL_WDTCONFIG0_REG;
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volatile uint32_t *wdt_timg_reg = (uint32_t *)TIMG_WDTCONFIG0_REG(0);
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volatile uint32_t *app_cpu_config_reg = (uint32_t *)DPORT_APPCPU_CTRL_B_REG;
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extern uint32_t _init_start;
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extern uint32_t _bss_start;
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extern uint32_t _bss_end;
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/* Move the exception vector table to IRAM. */
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__asm__ __volatile__ (
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"wsr %0, vecbase"
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:
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: "r"(&_init_start));
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/* Zero out BSS. Clobber _bss_start to avoid memset() elision. */
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(void)memset(&_bss_start, 0,
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(&_bss_end - &_bss_start) * sizeof(_bss_start));
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__asm__ __volatile__ (
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""
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:
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: "g"(&_bss_start)
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: "memory");
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/* The watchdog timer is enabled in the bootloader. We're done booting,
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* so disable it.
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*/
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*wdt_rtc_reg &= ~RTC_CNTL_WDT_FLASHBOOT_MOD_EN;
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*wdt_timg_reg &= ~TIMG_WDT_FLASHBOOT_MOD_EN;
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/* Disable normal interrupts. */
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__asm__ __volatile__ (
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"wsr %0, PS"
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:
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: "r"(PS_INTLEVEL(XCHAL_EXCM_LEVEL) | PS_UM | PS_WOE));
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/* Disable CPU1 while we figure out how to have SMP in Zephyr. */
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*app_cpu_config_reg &= ~DPORT_APPCPU_CLKGATE_EN;
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/* Initialize the architecture CPU pointer. Some of the
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* initialization code wants a valid _current before
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* arch_kernel_init() is invoked.
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*/
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__asm__ volatile("wsr.MISC0 %0; rsync" : : "r"(&_kernel.cpus[0]));
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/* Start Zephyr */
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z_cstart();
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CODE_UNREACHABLE;
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}
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/* Boot-time static default printk handler, possibly to be overridden later. */
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int arch_printk_char_out(int c)
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{
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if (c == '\n') {
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esp32_rom_uart_tx_one_char('\r');
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}
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esp32_rom_uart_tx_one_char(c);
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return 0;
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}
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