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#include "drivers/uart.h"
#include "kernel/pmm.h"
#include "kernel/mm.h"
#include "kernel/trap.h"
#include "kernel/proc.h"
#include "kernel/timer.h"
void delay()
{
for(volatile int i = 0; i < 1000000; i++)
{
}
}
void task_a()
{
while(1)
{
Drivers::uart_putc('A');
delay();
ProcManager::yield();
}
}
void task_b()
{
while (1)
{
Drivers::uart_putc('B');
delay();
ProcManager::yield();
}
}
extern "C" void kernel_main()
{
Drivers::uart_init();
Drivers::uart_puts("\n[Modern DOS Kernel] Booted in S-Mode.\n");
Drivers::uart_puts("2025 Richard Qin\n");
Drivers::uart_puts("\n");
Drivers::uart_puts("\n[Boot] Kernel started.\n");
PMM::init();
Drivers::uart_puts("[Boot] PMM initialized.\n");
VM::kvminit();
Drivers::uart_puts("[Boot] Kernel page table created.\n");
VM::kvminithart();
Drivers::uart_puts("[Boot] MMU ENABLED! We are now using virtual addresses.\n");
Trap::init();
Drivers::uart_puts("[Boot] Trap Handler Installed.\n");
Timer::init();
Drivers::uart_puts("[Boot] Timer Interrupt Enabled.\n");
// Drivers::uart_puts("\n[Test] Triggering Page Fault by reading 0x0...\n");
// volatile int *p = (int *)0x0;
// int crash = *p;
// (void)crash;
// Drivers::uart_puts("[Test Failed] Shuold not reach here.\n");
// Drivers::uart_puts("\n[Test] Triggering Store Fault on Text Segment...\n");
// *(int*)0x80000000 = 1234;
ProcManager::init();
Drivers::uart_puts("[Boot] Process Manager initialized.\n");
ProcManager::create_kernel_thread(task_a, "Task A");
ProcManager::create_kernel_thread(task_b, "Task B");
ProcManager::scheduler();
while (1)
{
}
}
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