126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-01-30 lizhirui first version
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "board.h"
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#include "tick.h"
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#include "drv_uart.h"
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#include "encoding.h"
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#include "stack.h"
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#include "sbi.h"
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#include "riscv.h"
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#include "stack.h"
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#include "hal_gpio.h"
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#include "hal_clk.h"
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#include "hal_uart.h"
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#include "hal_dma.h"
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#ifdef RT_USING_SMART
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#include "riscv_mmu.h"
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#include "mmu.h"
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#include "page.h"
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#include "lwp_arch.h"
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//这个结构体描述了buddy system的页分配范围
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rt_region_t init_page_region =
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{
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(rt_size_t)RT_HW_PAGE_START,
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(rt_size_t)RT_HW_PAGE_END
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};
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//内核页表
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volatile rt_size_t MMUTable[__SIZE(VPN2_BIT)] __attribute__((aligned(4 * 1024)));
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rt_mmu_info mmu_info;
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#endif
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//初始化BSS节区
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void init_bss(void)
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{
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unsigned int *dst;
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dst = &__bss_start;
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while (dst < &__bss_end)
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{
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*dst++ = 0;
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}
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}
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static void __rt_assert_handler(const char *ex_string, const char *func, rt_size_t line)
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{
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rt_kprintf("(%s) assertion failed at function:%s, line number:%d \n", ex_string, func, line);
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asm volatile("ebreak":::"memory");
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}
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//BSP的C入口
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void primary_cpu_entry(void)
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{
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//初始化BSS
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init_bss();
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//关中断
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rt_hw_interrupt_disable();
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rt_assert_set_hook(__rt_assert_handler);
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//启动RT-Thread Smart内核
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entry();
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}
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//这个初始化程序由内核主动调用，此时调度器还未启动，因此在此不能使用依赖线程上下文的函数
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void rt_hw_board_init(void)
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{
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#ifdef RT_USING_SMART
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rt_page_init(init_page_region);
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rt_hw_mmu_map_init(&mmu_info,(void *)USER_VADDR_START, USER_VADDR_TOP - USER_VADDR_START, (rt_size_t *)MMUTable, 0);
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rt_hw_mmu_kernel_map_init(&mmu_info, 0x00000000UL, USER_VADDR_START - 1);
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//将低1GB MMIO区域设置为无Cache与Strong Order访存模式
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MMUTable[0] &= ~PTE_CACHE;
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MMUTable[0] &= ~PTE_SHARE;
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MMUTable[0] |= PTE_SO;
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rt_hw_mmu_switch((void *)MMUTable);
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#endif
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/* initalize interrupt */
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rt_hw_interrupt_init();
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#ifdef RT_USING_HEAP
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rt_kprintf("heap: [0x%08x - 0x%08x]\n", (rt_ubase_t) RT_HW_HEAP_BEGIN, (rt_ubase_t) RT_HW_HEAP_END);
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/* initialize memory system */
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rt_system_heap_init(RT_HW_HEAP_BEGIN, RT_HW_HEAP_END);
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#endif
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/* init hal hardware */
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hal_clock_init();
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hal_gpio_init();
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hal_uart_init(0);
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hal_dma_init();
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/* init rtthread hardware */
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rt_hw_uart_init();
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rt_hw_tick_init();
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#ifdef RT_USING_CONSOLE
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/* set console device */
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rt_console_set_device("uart");
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#endif /* RT_USING_CONSOLE */
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#ifdef RT_USING_COMPONENTS_INIT
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rt_components_board_init();
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#endif
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}
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void rt_hw_cpu_reset(void)
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{
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sbi_shutdown();
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while(1);
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}
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MSH_CMD_EXPORT_ALIAS(rt_hw_cpu_reset, reboot, reset machine);
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