loader.c

Hermit-at-1.1.3,一款bootloader

/*
 * Copyright (c) 2000 Blue Mug, Inc.  All Rights Reserved.
 */

#include <target/buffer.h>
#include <target/crc.h>
#include <target/io.h>
#include <ep7211/ioregs.h>
#include "eth.h"
#include "flash.h"
#include "frob.h"
#include "keyboard.h"
#include "life.h"
#include "linux.h"
#include "memmap.h"

#define DLBUFSIZE (8*1024)
unsigned char dlbuf [DLBUFSIZE];
word_t dlbufsize = DLBUFSIZE;

/* timeout for auto-boot, in seconds */
#define BOOT_TIMEOUT 5

static const command_t *commands[] = {
	&help_command,
	&download_command,
	&flash_erase_command,
	&ether_mac_command,
	&frob_command,
#ifdef HAVE_LIFE
	&game_of_life_command,
#endif
	&jump_command,
	&linux_command,
	&medium_command,
	&memmap_command,
	&flash_program_command,
	&unzip_command,
	&upload_command,
	&version_command,
	0
};

ABBR(help_command, '?')
ABBR(frob_command, 'f')
ABBR(version_command, 'V')

static const abbrev_t *abbrevs[] = {
	&help_command_abbrev,
	&frob_command_abbrev,
	&version_command_abbrev,
	0
};

static inline void maybe_start_linux(void)
{
#if defined STANDALONE
	/* always go to the command loop */
#elif defined HAVE_KEYBOARD
	if (!is_any_key_pressed())
		start_linux();
#else
	/* boot linux unless a key is pressed before the timeout elapses */
	hprintf("Press a key within %d seconds for console.\n", BOOT_TIMEOUT);
	IO_RTCMR = IO_RTCDR + BOOT_TIMEOUT;
	while (IO_SYSFLG2 & URXFE2) {
		if (IO_RTCMR <= IO_RTCDR)
			start_linux();
	}
#endif
}

int main(void)
{
	command_list_t command_list = { commands, abbrevs, "hermit", 0 };

	maybe_start_linux();

	/* startup stuff: activate LED and print version string */
	(*version_command.func)(0, 0);
	init_crc32();
	IO_LEDFLSH = 0x7c;	/* LED continuous on */
	do_command_loop(&command_list);
	for (;;);
}