bios.c

arm学习报告

/* 
 * Compex BIOS for SAMSUNG S3C4510B v1.20
 * modified by duyunhai([e-mail]) for "ARM study report 003"
 * bios-dyh v1.5
 */

#include "types.h"
#include "bios.h"
#include "board.h"
#include "console.h"
#include "utils.h"
#include "gunzip.h"

extern const unsigned long _rom_base;
extern const unsigned long system_table_offset;

extern const unsigned char sysinit_data[];
extern const unsigned char biosapi_data[];
extern const unsigned char tftp_data[];

extern const unsigned char uart_rec_data[];


int sys_init(struct system_table_struct *system_table, unsigned long rom_base, unsigned long dram_base)
{
	typedef int (SYSINIT)(struct system_table_struct *, unsigned long, unsigned long);
	SYSINIT *sys_init_ptr;

	memcpy((char *)SRAM_BASE, sysinit_data, 1024 * 3);
	sys_init_ptr = (SYSINIT *)SRAM_BASE;
	sys_init_ptr(system_table, rom_base, dram_base);

	return 0;
}

int biosapi_init(void)
{
	unsigned char *inbuf;
	unsigned long insize;
	unsigned char *outbuf;
	unsigned long outsize;
	struct biosapi_init_struct init_param;
	BIOSCALL *fp;

	inbuf = (unsigned char *)biosapi_data;
	outbuf = (unsigned char *)BIOS_API_ADDR;
	insize = 0x7fffffff;
	outsize = 0x7fffffff;
	gunzip(inbuf, &insize, outbuf, &outsize);

	init_param.rom_base = _rom_base;
	init_param.dram_base = DRAM_BASE;
	init_param.system_table_offset = system_table_offset;

	fp = (BIOSCALL *)outbuf;
	return (*fp)(0, (unsigned long)&init_param);  // Init BIOS call
}


int uart_receive()
{	
	typedef int (UART_REC)(void);
	UART_REC *uart_rec_ptr;
	
	memcpy((char *)UART_REC_ADDR, uart_rec_data, 1024 * 5);
	
	uart_rec_ptr= (UART_REC *)UART_REC_ADDR;
	
	(*uart_rec_ptr)();
	
	return 0;
}


int load_tftp(unsigned long mode, unsigned long param)
{
	typedef int (TFTP)(unsigned long, unsigned long, unsigned long);
	unsigned char *inbuf;
	unsigned long insize;
	unsigned char *outbuf;
	unsigned long outsize;
	unsigned long ip;
	TFTP *tftp_ptr;

	inbuf = (unsigned char *)tftp_data;
	outbuf = (unsigned char *)TFTP_ADDR;
	insize = 0x7fffffff;
	outsize = 0x7fffffff;
	gunzip(inbuf, &insize, outbuf, &outsize);
	tftp_ptr = (TFTP *)TFTP_ADDR;
	ip = bios_tftp_ipaddr();
	tftp_ptr(ip, mode, param);

	return 0;
}



int main_menu(struct system_table_struct *system_table)
{
	int list[] = {
		BOOT_LOAD_FIRMWARE,
		BOOT_LOAD_PROGRAM,
		BOOT_BIOS_SETUP,
		BOOT_LOAD_UART0,		//bios-dyh modified
		BOOT_UPDATE_BIOS,
		BOOT_UPDATE_SYSPARAMETERS,
		BOOT_UPDATE_PARTITIONTABLE,
		BOOT_UPDATE_PARTITION,
		BOOT_UPDATE_FIRMWARE,
		};
	int select;
	int ch;
	int sh;
	
	
	printf("Main Menu For bios-dyh \r\n\r\n");
	printf("1 - Run uClinux \r\n");
	printf("2 - Load uClinux image to sdram by tftp and Run \r\n");
	printf("3 - Burn uClinux image to flash \r\n");
	printf("4 - Update BIOS!!! \r\n");
	printf("5 - Load image to sdram from uart0 and run (Low Speed!!!)\r\n");
	printf("\r\n");
	printf("Please Select: ");
	
	while (1) {
		sh = getch();
		if (sh >= '1' && sh <= '5') {
		
			if (sh=='1')
				ch='1';
			if (sh=='2')
				ch='2';
			if (sh=='3')
				ch='9';
			if (sh=='4')
				ch='5';
			if (sh=='5')
				ch='4';
		
			putch(sh);
			select = list[ch - '1'];
			break;
		}
	}
	printf("\r\n\r\n");

	return select;
}

int menu(struct system_table_struct *system_table)
{
	int select, partition_num = 0;
	unsigned long input_data;
	unsigned long i;
	unsigned long linux_origin=0x01010000;
	while (1) {
		select = main_menu(system_table);

		if (select == BOOT_LOAD_FIRMWARE) {
			for(i=0;i<1024*1024*2;i++)
			{
				*(volatile unsigned char*)(0x8000+i)=*(volatile unsigned char*)(linux_origin+i);
			}
			asm(    "
	                        ldr     r14, =0x00008000;
	                        mov     PC, r14; "
	                );
			break;
		}

		
		switch (select) {

		case BOOT_LOAD_PROGRAM:
			load_tftp(select, partition_num);
			break;
		
		case BOOT_UPDATE_FIRMWARE:
 	                printf("Sorry,this function is not complement!\r\n\n\n");
			break;
		
		case BOOT_UPDATE_BIOS: 
			printf("Sorry,this function is not complement!\r\n\n\n");
			break;
							
		case BOOT_LOAD_UART0:			
			uart_receive();
                        break;
		
		default:
			break;
		}
	}

	return select;
}

/*
 *  Main BIOS functions
 */

unsigned char *bios_main(void)
{
	struct system_table_struct *system_table;

	unsigned long startup_mode;
	int i, ch;

	system_table = (struct system_table_struct *)(_rom_base + system_table_offset);

	sys_init(system_table, _rom_base, DRAM_BASE);
	console_init();

	printf("\r\n\r\n");
	printf("Compex BIOS for SAMSUNG S3C4510B v1.20 (build 0801)\r\n\r\n");
	printf("modified by duyunhai for 'ARM study report 003'\r\n");

	biosapi_init();
	printf("\r\n");

	startup_mode = bios_startup_mode();


	if (startup_mode == BOOT_MENU) {
		startup_mode = menu(system_table);
	}

	return (unsigned char *)_rom_base;   //return to head.S with _rom_base in r0
}