C++ env_setenv函数代码示例

static void
extract_currdev(struct bootinfo *bootinfop)
{
	const char *bootdev;

	/*
	 * Pick up boot device information from boot2.
	 *
	 * XXXRW: Someday: device units.
	 */
	switch(bootinfop->bi_boot_dev_type) {
	case BOOTINFO_DEV_TYPE_DRAM:
		bootdev = "dram0";
		break;

	case BOOTINFO_DEV_TYPE_CFI:
		bootdev = "cfi0";
		break;

	case BOOTINFO_DEV_TYPE_SDCARD:
		bootdev = "sdcard0";
		break;

	default:
		bootdev = NULL;
	}

	if (bootdev != NULL) {
		env_setenv("currdev", EV_VOLATILE, bootdev, NULL, env_nounset);
		env_setenv("loaddev", EV_VOLATILE, bootdev, env_noset,
		    env_nounset);
	}
}

static void cfe_setup_default_env(void)
{
    char buffer[80];

    xsprintf(buffer,"%d.%d.%d",CFE_VER_MAJOR,CFE_VER_MINOR,CFE_VER_BUILD);
    env_setenv("CFE_VERSION",buffer,ENV_FLG_BUILTIN | ENV_FLG_READONLY);

    if (cfe_boardname) {
	env_setenv("CFE_BOARDNAME",(char *) cfe_boardname,
		   ENV_FLG_BUILTIN | ENV_FLG_READONLY);
	}

    xsprintf(buffer,"%d",mem_totalsize);
    env_setenv("CFE_MEMORYSIZE",buffer,ENV_FLG_BUILTIN | ENV_FLG_READONLY);

}

/*
 * Select a console.
 *
 * XXX Note that the console system design allows for some extension
 *     here (eg. multiple consoles, input/output only, etc.)
 */
static int
cons_set(struct env_var *ev, int flags, void *value)
{
    int		cons, active;

    if ((value == NULL) || ((active = cons_find(value)) == -1)) {
	if (value != NULL) 
	    printf("no such console '%s'\n", (char *)value);
	printf("Available consoles:\n");
	for (cons = 0; consoles[cons] != NULL; cons++)
	    printf("    %s\n", consoles[cons]->c_name);
	return(CMD_ERROR);
    }

    /* disable all current consoles */
    for (cons = 0; consoles[cons] != NULL; cons++)
	consoles[cons]->c_flags &= ~(C_ACTIVEIN | C_ACTIVEOUT);
    
    /* enable selected console */
    consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
    consoles[active]->c_init(0);

    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
    return(CMD_OK);
}

/*
 * Set the 'current device' by (if possible) recovering the boot device as 
 * supplied by the initial bootstrap.
 */
static void
extract_currdev(void)
{
	struct disk_devdesc dev;

	//bzero(&dev, sizeof(dev));

#if defined(USERBOOT_ZFS_SUPPORT)
	if (userboot_zfs_found) {
		struct zfs_devdesc zdev;
	
		/* Leave the pool/root guid's unassigned */
		bzero(&zdev, sizeof(zdev));
		zdev.d_dev = &zfs_dev;
		zdev.d_type = zdev.d_dev->dv_type;
		
		dev = *(struct disk_devdesc *)&zdev;
		init_zfs_bootenv(zfs_fmtdev(&dev));
	} else
#endif

	if (userboot_disk_maxunit > 0) {
		dev.d_dev = &userboot_disk;
		dev.d_type = dev.d_dev->dv_type;
		dev.d_unit = 0;
		dev.d_slice = 0;
		dev.d_partition = 0;
		/*
		 * If we cannot auto-detect the partition type then
		 * access the disk as a raw device.
		 */
		if (dev.d_dev->dv_open(NULL, &dev)) {
			dev.d_slice = -1;
			dev.d_partition = -1;
		}
	} else {
		dev.d_dev = &host_dev;
		dev.d_type = dev.d_dev->dv_type;
		dev.d_unit = 0;
	}

	env_setenv("currdev", EV_VOLATILE, userboot_fmtdev(&dev),
	    userboot_setcurrdev, env_nounset);
	env_setenv("loaddev", EV_VOLATILE, userboot_fmtdev(&dev),
	    env_noset, env_nounset);
}

int
setenv(const char *name, const char *value, int overwrite)
{
    /* No guarantees about state, always assume volatile */
    if (overwrite || (env_getenv(name) == NULL))
	return(env_setenv(name, EV_VOLATILE, value, NULL, NULL));
    return(0);
}

/*
 * Detect possible console(s) to use.  If preferred console(s) have been
 * specified, mark them as active. Else, mark the first probed console
 * as active.  Also create the console variable.
 */
void
cons_probe(void) 
{
    int			cons;
    int			active;
    char		*prefconsole;
    
    /* Do all console probes */
    for (cons = 0; consoles[cons] != NULL; cons++) {
	consoles[cons]->c_flags = 0;
 	consoles[cons]->c_probe(consoles[cons]);
    }
    /* Now find the first working one */
    active = -1;
    for (cons = 0; consoles[cons] != NULL && active == -1; cons++) {
	consoles[cons]->c_flags = 0;
 	consoles[cons]->c_probe(consoles[cons]);
	if (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT))
	    active = cons;
    }
    /* Force a console even if all probes failed */
    if (active == -1)
	active = 0;

    /* Check to see if a console preference has already been registered */
    prefconsole = getenv("console");
    if (prefconsole != NULL)
	prefconsole = strdup(prefconsole);
    if (prefconsole != NULL) {
	unsetenv("console");		/* we want to replace this */
	cons_change(prefconsole);
    } else {
	consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
	consoles[active]->c_init(0);
	prefconsole = strdup(consoles[active]->c_name);
    }

    printf("Consoles: ");
    for (cons = 0; consoles[cons] != NULL; cons++)
	if (consoles[cons]->c_flags & (C_ACTIVEIN | C_ACTIVEOUT))
	    printf("%s  ", consoles[cons]->c_desc);
    printf("\n");

    if (prefconsole != NULL) {
	env_setenv("console", EV_VOLATILE, prefconsole, cons_set,
	    env_nounset);
	free(prefconsole);
    }
}

/*
 * Select one or more consoles.
 */
static int
cons_set(struct env_var *ev, int flags, const void *value)
{
    int		cons;

    if ((value == NULL) || (cons_check(value) == -1)) {
	if (value != NULL) 
	    printf("no such console!\n");
	printf("Available consoles:\n");
	for (cons = 0; consoles[cons] != NULL; cons++)
	    printf("    %s\n", consoles[cons]->c_name);
	return(CMD_ERROR);
    }

    cons_change(value);

    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
    return(CMD_OK);
}

int cfe_set_console(char *name)
{
    xprinthook = console_xprint;

#if !CFG_MINIMAL_SIZE
    if (strcmp(name,CFE_BUFFER_CONSOLE) == 0) {
	console_buffer_flg = 1;
	return 0;
	}
#endif

    if (name) {
	int res;
	res = env_setenv("BOOT_CONSOLE",name,
		   ENV_FLG_BUILTIN | ENV_FLG_READONLY | ENV_FLG_ADMIN);
	return console_open(name);
	}
    return -1;
}

/*
 * Detect possible console(s) to use.  The first probed console
 * is marked active.  Also create the console variable.
 *	
 * XXX Add logic for multiple console support.
 */
void
cons_probe(void) 
{
    int			cons;
    int			active;
    char		*prefconsole;
    
    /* Do all console probes */
    for (cons = 0; consoles[cons] != NULL; cons++) {
	consoles[cons]->c_flags = 0;
 	consoles[cons]->c_probe(consoles[cons]);
    }
    /* Now find the first working one */
    active = -1;
    for (cons = 0; consoles[cons] != NULL && active == -1; cons++) {
	consoles[cons]->c_flags = 0;
 	consoles[cons]->c_probe(consoles[cons]);
	if (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT))
	    active = cons;
    }

    /* Check to see if a console preference has already been registered */
    prefconsole = getenv("console");
    if (prefconsole != NULL)
	prefconsole = strdup(prefconsole);
    if (prefconsole != NULL) {
	unsetenv("console");		/* we want to replace this */
	for (cons = 0; consoles[cons] != NULL; cons++)
	    /* look for the nominated console, use it if it's functional */
	    if (!strcmp(prefconsole, consoles[cons]->c_name) &&
		(consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT)))
		active = cons;
	free(prefconsole);
    }
    if (active == -1)
	active = 0;
    consoles[active]->c_flags |= (C_ACTIVEIN | C_ACTIVEOUT);
    consoles[active]->c_init(0);

    printf("Console: %s\n", consoles[active]->c_desc);
    env_setenv("console", EV_VOLATILE, consoles[active]->c_name, (ev_sethook_t *) cons_set,
	env_nounset);
}

//.........这里部分代码省略.........
		setenv("console", "comconsole" , 1);
	}

	if (efi_copy_init()) {
		printf("failed to allocate staging area\n");
		return (EFI_BUFFER_TOO_SMALL);
	}

	/*
	 * March through the device switch probing for things.
	 */
	for (i = 0; devsw[i] != NULL; i++)
		if (devsw[i]->dv_init != NULL)
			(devsw[i]->dv_init)();

	/* Get our loaded image protocol interface structure. */
	BS->HandleProtocol(IH, &imgid, (VOID**)&img);

	printf("Command line arguments:");
	for (i = 0; i < argc; i++) {
		printf(" ");
		print_str16(argv[i]);
	}
	printf("\n");

	printf("Image base: 0x%lx\n", (u_long)img->ImageBase);
	printf("EFI version: %d.%02d\n", ST->Hdr.Revision >> 16,
	    ST->Hdr.Revision & 0xffff);
	printf("EFI Firmware: ");
	/* printf doesn't understand EFI Unicode */
	ST->ConOut->OutputString(ST->ConOut, ST->FirmwareVendor);
	printf(" (rev %d.%02d)\n", ST->FirmwareRevision >> 16,
	    ST->FirmwareRevision & 0xffff);

	printf("\n");
	printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
	printf("(%s, %s)\n", bootprog_maker, bootprog_date);

	/*
	 * Disable the watchdog timer. By default the boot manager sets
	 * the timer to 5 minutes before invoking a boot option. If we
	 * want to return to the boot manager, we have to disable the
	 * watchdog timer and since we're an interactive program, we don't
	 * want to wait until the user types "quit". The timer may have
	 * fired by then. We don't care if this fails. It does not prevent
	 * normal functioning in any way...
	 */
	BS->SetWatchdogTimer(0, 0, 0, NULL);

	if (efi_handle_lookup(img->DeviceHandle, &dev, &unit, &pool_guid) != 0)
		return (EFI_NOT_FOUND);

	switch (dev->dv_type) {
#ifdef EFI_ZFS_BOOT
	case DEVT_ZFS: {
		struct zfs_devdesc currdev;

		currdev.d_dev = dev;
		currdev.d_unit = unit;
		currdev.d_type = currdev.d_dev->dv_type;
		currdev.d_opendata = NULL;
		currdev.pool_guid = pool_guid;
		currdev.root_guid = 0;
		env_setenv("currdev", EV_VOLATILE, efi_fmtdev(&currdev),
			   efi_setcurrdev, env_nounset);
		env_setenv("loaddev", EV_VOLATILE, efi_fmtdev(&currdev), env_noset,
			   env_nounset);
		init_zfs_bootenv(zfs_fmtdev(&currdev));
		break;
	}
#endif
	default: {
		struct devdesc currdev;

		currdev.d_dev = dev;
		currdev.d_unit = unit;
		currdev.d_opendata = NULL;
		currdev.d_type = currdev.d_dev->dv_type;
		env_setenv("currdev", EV_VOLATILE, efi_fmtdev(&currdev),
			   efi_setcurrdev, env_nounset);
		env_setenv("loaddev", EV_VOLATILE, efi_fmtdev(&currdev), env_noset,
			   env_nounset);
		break;
	}
	}

	setenv("LINES", "24", 1);	/* optional */

	for (k = 0; k < ST->NumberOfTableEntries; k++) {
		guid = &ST->ConfigurationTable[k].VendorGuid;
		if (!memcmp(guid, &smbios, sizeof(EFI_GUID))) {
			smbios_detect(ST->ConfigurationTable[k].VendorTable);
			break;
		}
	}

	interact(NULL);			/* doesn't return */

	return (EFI_SUCCESS);		/* keep compiler happy */
}

EFI_STATUS
main(int argc, CHAR16 *argv[])
{
	char var[128];
	EFI_LOADED_IMAGE *img;
	EFI_GUID *guid;
	int i, j, vargood;

	/*
	 * XXX Chicken-and-egg problem; we want to have console output
	 * early, but some console attributes may depend on reading from
	 * eg. the boot device, which we can't do yet.  We can use
	 * printf() etc. once this is done.
	 */
	cons_probe();

	/*
	 * Loop through the args, and for each one that contains an '=' that is
	 * not the first character, add it to the environment.  This allows
	 * loader and kernel env vars to be passed on the command line.  Convert
	 * args from UCS-2 to ASCII (16 to 8 bit) as they are copied.
	 */
	for (i = 1; i < argc; i++) {
		vargood = 0;
		for (j = 0; argv[i][j] != 0; j++) {
			if (j == sizeof(var)) {
				vargood = 0;
				break;
			}
			if (j > 0 && argv[i][j] == '=')
				vargood = 1;
			var[j] = (char)argv[i][j];
		}
		if (vargood) {
			var[j] = 0;
			putenv(var);
		}
	}

	if (efi_copy_init()) {
		printf("failed to allocate staging area\n");
		return (EFI_BUFFER_TOO_SMALL);
	}

	/*
	 * March through the device switch probing for things.
	 */
	for (i = 0; devsw[i] != NULL; i++)
		if (devsw[i]->dv_init != NULL)
			(devsw[i]->dv_init)();

	/* Get our loaded image protocol interface structure. */
	BS->HandleProtocol(IH, &imgid, (VOID**)&img);

	printf("Image base: 0x%lx\n", (u_long)img->ImageBase);
	printf("EFI version: %d.%02d\n", ST->Hdr.Revision >> 16,
	    ST->Hdr.Revision & 0xffff);
	printf("EFI Firmware: ");
	/* printf doesn't understand EFI Unicode */
	ST->ConOut->OutputString(ST->ConOut, ST->FirmwareVendor);
	printf(" (rev %d.%02d)\n", ST->FirmwareRevision >> 16,
	    ST->FirmwareRevision & 0xffff);

	printf("\n");
	printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
	printf("(%s, %s)\n", bootprog_maker, bootprog_date);

	efi_handle_lookup(img->DeviceHandle, &currdev.d_dev, &currdev.d_unit);
	currdev.d_type = currdev.d_dev->dv_type;

	/*
	 * Disable the watchdog timer. By default the boot manager sets
	 * the timer to 5 minutes before invoking a boot option. If we
	 * want to return to the boot manager, we have to disable the
	 * watchdog timer and since we're an interactive program, we don't
	 * want to wait until the user types "quit". The timer may have
	 * fired by then. We don't care if this fails. It does not prevent
	 * normal functioning in any way...
	 */
	BS->SetWatchdogTimer(0, 0, 0, NULL);

	env_setenv("currdev", EV_VOLATILE, efi_fmtdev(&currdev),
	    efi_setcurrdev, env_nounset);
	env_setenv("loaddev", EV_VOLATILE, efi_fmtdev(&currdev), env_noset,
	    env_nounset);

	setenv("LINES", "24", 1);	/* optional */

	archsw.arch_autoload = efi_autoload;
	archsw.arch_getdev = efi_getdev;
	archsw.arch_copyin = efi_copyin;
	archsw.arch_copyout = efi_copyout;
	archsw.arch_readin = efi_readin;

	for (i = 0; i < ST->NumberOfTableEntries; i++) {
		guid = &ST->ConfigurationTable[i].VendorGuid;
		if (!memcmp(guid, &smbios, sizeof(EFI_GUID))) {
			smbios_detect(ST->ConfigurationTable[i].VendorTable);
			break;
		}
//.........这里部分代码省略.........

/*  *********************************************************************
    *  cfe_boot(la)
    *  
    *  Bootstrap the system.
    *  
    *  Input parameters: 
    *  	   la - loader arguments
    *  	   
    *  Return value:
    *  	   error, or does not return
    ********************************************************************* */
int cfe_boot(char *ldrname,cfe_loadargs_t *la)
{
    int res;

    la->la_entrypt = 0;

    if (la->la_flags & LOADFLG_NOISY) {
	xprintf("Loading: ");
	}

    res = cfe_load_program(ldrname,la);

    if (res < 0) {
	if (la->la_flags & LOADFLG_NOISY) {
	    xprintf("Failed.\n");
	    }
	return res;
	}

    /*	
     * Special case: If loading a batch file, just do the commands here
     * and return.  For batch files we don't want to set up the
     * environment variables.
     */

    if (la->la_flags & LOADFLG_BATCH) {
#if CFG_UI
	ui_docommands((char *) la->la_entrypt);
#endif
	return 0;
	}

    /*
     * Otherwise set up for running a real program.
     */

    if (la->la_flags & LOADFLG_NOISY) {
	xprintf("Entry at 0x%p\n",la->la_entrypt);
	}

    /*
     * Set up the environment variables for the bootstrap
     */

    if (la->la_device) {
	env_setenv(bootvar_device,la->la_device,ENV_FLG_BUILTIN);
	}
    else {
	env_delenv(bootvar_device);
	}

    if (la->la_filename) {
	env_setenv(bootvar_file,la->la_filename,ENV_FLG_BUILTIN);
	}
    else {
	env_delenv(bootvar_file);
	}

    if (la->la_options) {
	env_setenv(bootvar_flags,la->la_options,ENV_FLG_BUILTIN);
	}
    else {
	env_delenv(bootvar_flags);
	}

    /*
     * Banzai!  Run the program.
     */

    if ((la->la_flags & LOADFLG_EXECUTE) &&
	(la->la_entrypt != 0)) {
	cfe_go(la);
	}

    return 0;
}

//.........这里部分代码省略.........
				console_read(&ch, 1);
				/* Check for Ctrl-C */
				if (ch == 3) {
					if (laddr)
						MFREE(osh, laddr, MAX_SCRIPT_FSIZE);
					xprintf("Stopped auto netboot!!!\n");
					return;
				}
			}

			if (!res) {
				char *bserver, *bfile, *load_ptr;

				if (!laddr)
					laddr = MALLOC(osh, MAX_SCRIPT_FSIZE);

				if (!laddr) {
					load_ptr = (char *) 0x00008000;
					xprintf("Failed malloc for boot_script, Using :0x%x\n",
						(unsigned int)laddr);
				}
				else {
					load_ptr = laddr;
				}
				bserver = (bserver = env_getenv("BOOT_SERVER"))
					? bserver:"192.168.1.1";

				if ((bfile = env_getenv("BOOT_FILE"))) {
					int len;

					if (((len = strlen(bfile)) > 5) &&
					    !strncmp((bfile + len - 5), "cfesh", 5)) {
						cur += sprintf(cur,
						"batch -raw -tftp -addr=0x%x -max=0x%x %s:%s;",
							(unsigned int)load_ptr,
							MAX_SCRIPT_FSIZE, bserver, bfile);
					}
					if (((len = strlen(bfile)) > 3)) {
						if (!strncmp((bfile + len - 3), "elf", 3)) {
							cur += sprintf(cur,
							"boot -elf -tftp -max=0x5000000 %s:%s;",
							bserver, bfile);
						}
						if (!strncmp((bfile + len - 3), "raw", 3)) {
							cur += sprintf(cur,
							"boot -raw -z -tftp -addr=0x00008000"
							" -max=0x5000000 %s:%s;",
							bserver, bfile);
						}
					}
				}
				else {  /* Make last effort */
					cur += sprintf(cur,
						"batch -raw -tftp -addr=0x%x -max=0x%x %s:%s;",
						(unsigned int)load_ptr, MAX_SCRIPT_FSIZE,
						bserver, "cfe_script.cfesh");
					cur += sprintf(cur,
						"boot -elf -tftp -max=0x5000000 %s:%s;",
						bserver, "boot_file.elf");
					cur += sprintf(cur,
						"boot -raw -z -tftp -addr=0x00008000"
						" -max=0x5000000 %s:%s;",
						bserver, "boot_file.raw");
				}

				ui_docommand(buf);
				cfe_sleep(3*CFE_HZ);
			}

			sprintf(buf, "ifconfig eth0 -auto");
			res = ui_docommand(buf);
		}
#endif /* CFG_ROMBOOT */
	}
#if CFG_WL && CFG_WLU && CFG_SIM
	if ((ssid = nvram_get("wl0_ssid"))) {
		sprintf(buf, "wl join %s", ssid);
		ui_docommand(buf);
	}
#endif

#if !CFG_SIM
	/* Try to run boot_config command if configured.
	 * make sure to leave space for "go" command.
	 */
	if ((boot_cfg = nvram_get("boot_config"))) {
		if (strlen(boot_cfg) < (sizeof(buf) - sizeof(go_cmd)))
			cur += sprintf(cur, "%s;", boot_cfg);
		else
			printf("boot_config too long, skipping to autoboot\n");
	}

	/* Boot image */
	cur += sprintf(cur, go_cmd);
#endif	/* !CFG_SIM */

	/* Startup */
	if (cur > buf)
		env_setenv("STARTUP", buf, ENV_FLG_NORMAL);
}

int
main(void)
{
	uint64_t maxmem = 0;
	void *heapbase;
	int i, err;
	struct ps3_devdesc currdev;
	struct open_file f;

	lv1_get_physmem(&maxmem);
	
	ps3mmu_init(maxmem);

	/*
	 * Set up console.
	 */
	cons_probe();

	/*
	 * Set the heap to one page after the end of the loader.
	 */
	heapbase = (void *)(maxmem - 0x80000);
	setheap(heapbase, maxmem);

	/*
	 * March through the device switch probing for things.
	 */
	for (i = 0; devsw[i] != NULL; i++) {
		if (devsw[i]->dv_init != NULL) {
			err = (devsw[i]->dv_init)();
			if (err) {
				printf("\n%s: initialization failed err=%d\n",
					devsw[i]->dv_name, err);
				continue;
			}
		}

		currdev.d_dev = devsw[i];
		currdev.d_type = currdev.d_dev->dv_type;

		if (strcmp(devsw[i]->dv_name, "cd") == 0) {
			f.f_devdata = &currdev;
			currdev.d_unit = 0;

			if (devsw[i]->dv_open(&f, &currdev) == 0)
				break;
		}

		if (strcmp(devsw[i]->dv_name, "disk") == 0) {
			f.f_devdata = &currdev;
			currdev.d_unit = 3;
			currdev.d_disk.pnum = 1;
			currdev.d_disk.ptype = PTYPE_GPT;

			if (devsw[i]->dv_open(&f, &currdev) == 0)
				break;
		}

		if (strcmp(devsw[i]->dv_name, "net") == 0)
			break;
	}

	if (devsw[i] == NULL)
		panic("No boot device found!");
	else
		printf("Boot device: %s\n", devsw[i]->dv_name);

	/*
	 * Get timebase at boot.
	 */
	basetb = mftb();

	archsw.arch_getdev = ps3_getdev;
	archsw.arch_copyin = ps3_copyin;
	archsw.arch_copyout = ps3_copyout;
	archsw.arch_readin = ps3_readin;
	archsw.arch_autoload = ps3_autoload;

	printf("\n");
	printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
	printf("(%s, %s)\n", bootprog_maker, bootprog_date);
	printf("Memory: %lldKB\n", maxmem / 1024);

	env_setenv("currdev", EV_VOLATILE, ps3_fmtdev(&currdev),
	    ps3_setcurrdev, env_nounset);
	env_setenv("loaddev", EV_VOLATILE, ps3_fmtdev(&currdev), env_noset,
	    env_nounset);
	setenv("LINES", "24", 1);
	setenv("hw.platform", "ps3", 1);

	interact();			/* doesn't return */

	return (0);
}

int
main(int (*openfirm)(void *))
{
	phandle_t	root;
	int		i;
	char		bootpath[64];
	char		*ch;
	int		bargc;
	char		**bargv;

	/*
	 * Initialize the Open Firmware routines by giving them the entry point.
	 */
	OF_init(openfirm);

	root = OF_finddevice("/");

	scells = acells = 1;
	OF_getprop(root, "#address-cells", &acells, sizeof(acells));
	OF_getprop(root, "#size-cells", &scells, sizeof(scells));

	/*
	 * Initialise the heap as early as possible.  Once this is done,
	 * alloc() is usable. The stack is buried inside us, so this is
	 * safe.
	 */
	init_heap();

	/*
         * Set up console.
         */
	cons_probe();

	/*
	 * March through the device switch probing for things.
	 */
	for (i = 0; devsw[i] != NULL; i++)
		if (devsw[i]->dv_init != NULL)
			(devsw[i]->dv_init)();

	printf("\n");
	printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
	printf("(%s, %s)\n", bootprog_maker, bootprog_date);
	printf("Memory: %lldKB\n", memsize() / 1024);

	OF_getprop(chosen, "bootpath", bootpath, 64);
	ch = strchr(bootpath, ':');
	*ch = '\0';
	printf("Booted from: %s\n", bootpath);

	printf("\n");

	/*
	 * Only parse the first bootarg if present. It should
	 * be simple to handle extra arguments
	 */
	OF_getprop(chosen, "bootargs", bootargs, sizeof(bootargs));
	bargc = 0;
	parse(&bargc, &bargv, bootargs);
	if (bargc == 1)
		env_setenv("currdev", EV_VOLATILE, bargv[0], ofw_setcurrdev,
		    env_nounset);
	else
		env_setenv("currdev", EV_VOLATILE, bootpath,
			   ofw_setcurrdev, env_nounset);
	env_setenv("loaddev", EV_VOLATILE, bootpath, env_noset,
	    env_nounset);
	setenv("LINES", "24", 1);		/* optional */

	archsw.arch_getdev = ofw_getdev;
	archsw.arch_copyin = ofw_copyin;
	archsw.arch_copyout = ofw_copyout;
	archsw.arch_readin = ofw_readin;
	archsw.arch_autoload = ofw_autoload;

	interact(NULL);				/* doesn't return */

	OF_exit();

	return 0;
}