main.c

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/*
 *	ApOS (Another Project software for s3c2410)
 *	
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License version 2 as
 *	published by the Free Software Foundation.
 *			
 *						Copyright caiyuqing
 *
 */
#include <string.h>
#include <stdarg.h>
#include "../include/s3c2410/lcd.h"
#include "../include/s3c2410/timer.h"
#include "../include/s3c2410/nand_flash.h"
#include "../include/s3c2410/clock.h"
#include "../include/s3c2410/cpu.h"
#include "../include/s3c2410/dma.h"
#include "../include/s3c2410/s3c2410.h"
#include "../include/kernel/sched.h"
#include "../include/kernel/gui.h"
#include "../include/kernel/irq.h"
#include "../include/kernel/task.h"
#include "../include/s3c2410/io.h"
#include "../include/kernel/sys.h"

#define KERNEL_BASE	0x30095000
//得到user模式下的cpsr的值
#define USER ({ \
int reg; \
	reg=read_cpsr();\
	reg&=~(0x1f);\
	reg|=UserMode;\
reg; })

extern struct lcd_control_obj 		lcd_control_obj;
extern struct io_control_obj 		io_control_obj;
extern struct irq_ctrl_object 		irq_ctrl_object;
extern struct timer_ctrl_object 	timer_ctrl_object;
extern struct touchsrc_ctrl_object 	touchsrc_ctrl_object;
extern struct dma_ctrl_object 		dma_ctrl_object;
extern struct sdi_control_obj 		sdi_control_obj;
extern struct iis_control_obj 		iis_control_obj;

extern struct elf_loader_obj 		elf_loader_obj;
extern struct memory_ctrl_object 	memory_ctrl_object;
extern struct usb_host_ctrl_object 	usb_host_ctrl_object;

union task_union init_task; 
extern struct task_struct* task[NR_TASKS];
extern struct task_struct* current; 
//inline system_call0(int,fork);

#define fork() ({ \
	unsigned int res;\
	unsigned int fun_id=NR_fork;\
	asm volatile(\
		"ldr r0,%1 \n\t"\
		"swi \n\t"\
		"str r0,%0 \n\t"\
		:"=m"(res)\
		:"m"(fun_id)\
		:"r0","memory"\
	);\
	res;\
})

void device_object_init()
{
	//lcd_control_obj_init(struct lcd_control_obj* ) define in ../device/lcd.c
	lcd_control_obj_init(&lcd_control_obj);
	//io_control_obj_init(struct io_control_obj* ) define in ../device/io.c
	io_control_obj_init(&io_control_obj);
	//irq_ctrl_obj_init(struct irq_ctrl_object* ) define in ../device/io.c
	irq_ctrl_obj_init(&irq_ctrl_object);
	//timer_ctrl_obj_init(struct timer_ctrl_object* ) define in ../device/timer.c
	timer_ctrl_obj_init(&timer_ctrl_object);
	//touchscreen_ctrl_obj_init(struct touchsrc_ctrl_object* ) define in ../device/touchscreen.c
	touchscreen_ctrl_obj_init(&touchsrc_ctrl_object);
	//dma_ctrl_obj_init(struct dma_ctrl_object* ) define in ../device/dma.c
	dma_ctrl_obj_init(&dma_ctrl_object);
	//sdi_ctrl_obj_init(struct sdi_control_obj* ) define in ../device/sdi.c
	sdi_ctrl_obj_init(&sdi_control_obj);
	//iis_ctrl_obj_init(struct iis_control_obj* ) define in ../device/iis.c
	iis_ctrl_obj_init(&iis_control_obj);
	//memory_ctrl_obj_init(struct memory_ctrl_object* ) define in ../device/memory.c
	memory_ctrl_obj_init(&memory_ctrl_object);
	usb_host_obj_init(&usb_host_ctrl_object);
	
}

void dump_info()
{
	set_con_font_color(RGB(0,255,255));
	printk("Welcome to ApOS's world :}\n\
Please login in www.antoher-prj.com to get more information\n\
Copyright to AnotherProject.\n\n");
 	
 	set_con_font_color(RGB(255,255,255));
  	printk("Hardware information:\n\n");
	printk("System clock: %dMHz\n\n\n",get_system_clock());
}



/*
 *	加载任务0并切换到用户模式，task0的使用的是内核的代码区，但它有属
 *	于自己堆栈，这样就不会引起permision fault.
 */
#define move_to_user() ({\
	unsigned int *regs=&(init_task.task.cpu_registers);\
	unsigned int cpu_mode=USER;\
	asm volatile(\
		"ldr r0,%0 \n\t"\
		"ldmib r0!,{r1-r13}\n\t"\
		"ldr r0,%1 \n\t"\
		"msr cpsr,r0 \n\t"\
		:\
		:"m"(regs),"m"(cpu_mode)\
	);\
})

void printf(char *fmt,...)
{
	int i;
	char printbuf[1024];
	
	va_list args;
	va_start(args,fmt);
	i=vsprintf(printbuf,fmt,args);
	va_end(args);
	/*
	 *	write函数是运行在System特权级下的，这和普通的
	 *	系统调用是不同的，系统调用是运行在SVC特权级下
	 *	的
	 */
	write(1,printbuf,i);
}

int main(void)
{

	//初始化所有设备控制对象
	device_object_init();

	/* 	set_system_clock(unsignd int) define in ../device/clock.c
	 *
	 *	system clock advance in APOS:
	 *					vMPLLCON_202MHz
	 *					vMPLLCON_170MHz
	 *					vMPLLCON_90MHz
	 *					vMPLLCON_50MHz
	 */
	set_system_clock(vMPLLCON_202MHz);
	io_config();		
	lcd_on();
	console_init();
	dump_info();
	touchsrc_con_init();
	irq_enable();
	ram_init();
	//sdi_init();
	if(mount_fat32()==-1)
		printk("file system mount fail.\n\n\n");
	else
			printk("FAT32 mount.\n");
	sched_init();
	set_sched_freq(50);	//时钟滴答为50赫兹
	enable_watchdog();
	//find_cluster("programe\\hello\\haha\\hello\\ding\\programe\\hello\\haha\\hello\\ding\\");
	move_to_user();//从这里开始的代码将运行在User模式
	start_task0();
	while(1);

}

void start_task0()
{
	if(fork()==0)
	{
		printf("Hello! I am task1.\n");
		while(1);

	}
	if(fork()==0)
	{
		printf("Hello! I am task2.\n");
		while(1);
	}
	if(fork()==0)
	{
		printf("Hello! I am task3.\n");
		while(1);
	}	
	if(fork()==0)
	{
		printf("Hello! I am task4.\n");
		while(1);
	}
	printf("Hello! I am task0.\n");
	while(1);

	
}