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