static void subdev_close(struct bdev *_dev)
{
subdev_t *subdev = (subdev_t *)_dev;
bio_close(subdev->parent);
subdev->parent = NULL;
}
// decrement the ref to the mount structure, which may
// cause an unmount operation
static void put_mount(struct fs_mount *mount)
{
mutex_acquire(&mount_lock);
if ((--mount->ref) == 0) {
list_delete(&mount->node);
mount->api->unmount(mount->cookie);
free(mount->path);
if (mount->dev)
bio_close(mount->dev);
free(mount);
}
mutex_release(&mount_lock);
}
static status_t mount(const char *path, const char *device, const struct fs_api *api)
{
struct fs_mount *mount;
char temppath[FS_MAX_PATH_LEN];
strlcpy(temppath, path, sizeof(temppath));
fs_normalize_path(temppath);
if (temppath[0] != '/')
return ERR_BAD_PATH;
/* see if there's already something at this path, abort if there is */
mount = find_mount(temppath, NULL);
if (mount) {
put_mount(mount);
return ERR_ALREADY_MOUNTED;
}
/* open a bio device if the string is nonnull */
bdev_t *dev = NULL;
if (device && device[0] != '\0') {
dev = bio_open(device);
if (!dev)
return ERR_NOT_FOUND;
}
/* call into the fs implementation */
fscookie *cookie;
status_t err = api->mount(dev, &cookie);
if (err < 0) {
if (dev) bio_close(dev);
return err;
}
/* create the mount structure and add it to the list */
mount = malloc(sizeof(struct fs_mount));
mount->path = strdup(temppath);
mount->dev = dev;
mount->cookie = cookie;
mount->ref = 1;
mount->api = api;
list_add_head(&mounts, &mount->node);
return 0;
}
static int cmd_bio(int argc, const cmd_args *argv)
{
int rc = 0;
if (argc < 2) {
printf("not enough arguments:\n");
usage:
printf("%s list\n", argv[0].str);
printf("%s read <device> <address> <offset> <len>\n", argv[0].str);
printf("%s write <device> <address> <offset> <len>\n", argv[0].str);
printf("%s erase <device> <offset> <len>\n", argv[0].str);
printf("%s ioctl <device> <request> <arg>\n", argv[0].str);
printf("%s remove <device>\n", argv[0].str);
#if WITH_LIB_PARTITION
printf("%s partscan <device> [offset]\n", argv[0].str);
#endif
return -1;
}
if (!strcmp(argv[1].str, "list")) {
bio_dump_devices();
} else if (!strcmp(argv[1].str, "read")) {
if (argc < 6) {
printf("not enough arguments:\n");
goto usage;
}
addr_t address = argv[3].u;
off_t offset = argv[4].u; // XXX use long
size_t len = argv[5].u;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
time_t t = current_time();
ssize_t err = bio_read(dev, (void *)address, offset, len);
t = current_time() - t;
dprintf(INFO, "bio_read returns %d, took %u msecs (%d bytes/sec)\n", (int)err, (uint)t, (uint32_t)((uint64_t)err * 1000 / t));
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "write")) {
if (argc < 6) {
printf("not enough arguments:\n");
goto usage;
}
addr_t address = argv[3].u;
off_t offset = argv[4].u; // XXX use long
size_t len = argv[5].u;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
time_t t = current_time();
ssize_t err = bio_write(dev, (void *)address, offset, len);
t = current_time() - t;
dprintf(INFO, "bio_write returns %d, took %u msecs (%d bytes/sec)\n", (int)err, (uint)t, (uint32_t)((uint64_t)err * 1000 / t));
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "erase")) {
if (argc < 5) {
printf("not enough arguments:\n");
goto usage;
}
off_t offset = argv[3].u; // XXX use long
size_t len = argv[4].u;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
time_t t = current_time();
ssize_t err = bio_erase(dev, offset, len);
t = current_time() - t;
dprintf(INFO, "bio_erase returns %d, took %u msecs (%d bytes/sec)\n", (int)err, (uint)t, (uint32_t)((uint64_t)err * 1000 / t));
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "ioctl")) {
if (argc < 4) {
printf("not enough arguments:\n");
goto usage;
}
int request = argv[3].u;
int arg = (argc == 5) ? argv[4].u : 0;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
int err = bio_ioctl(dev, request, (void *)arg);
dprintf(INFO, "bio_ioctl returns %d\n", err);
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "remove")) {
if (argc < 3) {
printf("not enough arguments:\n");
goto usage;
}
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
bio_unregister_device(dev);
bio_close(dev);
#if WITH_LIB_PARTITION
} else if (!strcmp(argv[1].str, "partscan")) {
if (argc < 3) {
printf("not enough arguments:\n");
goto usage;
}
off_t offset = 0;
if (argc > 3)
offset = argv[3].u;
rc = partition_publish(argv[2].str, offset);
dprintf(INFO, "partition_publish returns %d\n", rc);
#endif
} else {
printf("unrecognized subcommand\n");
goto usage;
}
return rc;
}
status_t bio_publish_subdevice(const char *parent_dev,
const char *subdev,
bnum_t startblock,
bnum_t block_count)
{
status_t err = NO_ERROR;
bdev_t *parent = NULL;
subdev_t *sub = NULL;
size_t geometry_count;
bio_erase_geometry_info_t* geometry;
LTRACEF("parent \"%s\", sub \"%s\", startblock %u, count %u\n", parent_dev, subdev, startblock, block_count);
// Make sure our parent exists
parent = bio_open(parent_dev);
if (!parent) {
LTRACEF("Failed to find parent \"%s\"\n", parent_dev);
BAIL(ERR_NOT_FOUND);
}
// Allocate our sub-device.
sub = malloc(sizeof(subdev_t));
if (!sub) {
LTRACEF("Failed to allocate subdevice\n");
BAIL(ERR_NO_MEMORY);
}
/* Make sure we're able to do this. If the device has a specified erase
* geometry, the specified sub-region must exist entirely with one of our
* parent's erase regions, and be aligned to an erase unit boundary.
* Otherwise, the specified region must simply exist within the block range
* of the device.
*/
if (parent->geometry_count && parent->geometry) {
uint64_t byte_start = ((uint64_t)startblock << parent->block_shift);
uint64_t byte_size = ((uint64_t)block_count << parent->block_shift);
const bio_erase_geometry_info_t* geo = NULL;
LTRACEF("Searching geometry for region which contains @[0x%llx, 0x%llx)\n",
byte_start, byte_start + byte_size);
// Start by finding the erase region which completely contains the requested range.
for (size_t i = 0; i < parent->geometry_count; ++i) {
geo = parent->geometry + i;
LTRACEF("Checking geometry @[0x%llx, 0x%llx) erase size 0x%zx\n",
geo->start,
geo->start + geo->size,
geo->erase_size);
if (bio_contains_range(geo->start, geo->size, byte_start, byte_size))
break;
}
if (!geo) {
LTRACEF("No suitable erase region found\n");
BAIL(ERR_INVALID_ARGS);
}
// Now check out alignment.
uint64_t erase_mask = ((uint64_t)0x1 << geo->erase_shift) - 1;
if ((byte_start & erase_mask) || (byte_size & erase_mask)) {
LTRACEF("Requested region has improper alignment/length\n");
BAIL(ERR_INVALID_ARGS);
}
geometry_count = 1;
geometry = &sub->geometry;
geometry->start = 0;
geometry->size = byte_size;
geometry->erase_size = geo->erase_size;
geometry->erase_shift = geo->erase_shift;
} else {
bnum_t endblock = startblock + block_count;
if ((endblock < startblock) || (endblock > parent->block_count))
BAIL(ERR_INVALID_ARGS);
geometry_count = 0;
geometry = NULL;
}
bio_initialize_bdev(&sub->dev, subdev,
parent->block_size, block_count,
geometry_count, geometry);
sub->parent = parent;
sub->offset = startblock;
sub->dev.read = &subdev_read;
sub->dev.read_block = &subdev_read_block;
sub->dev.write = &subdev_write;
sub->dev.write_block = &subdev_write_block;
sub->dev.erase = &subdev_erase;
sub->dev.close = &subdev_close;
bio_register_device(&sub->dev);
bailout:
if (err < 0) {
if (NULL != parent)
bio_close(parent);
free(sub);
}
return err;
}
static int cmd_bio(int argc, const cmd_args *argv)
{
int rc = 0;
if (argc < 2) {
notenoughargs:
printf("not enough arguments:\n");
usage:
printf("%s list\n", argv[0].str);
printf("%s read <device> <address> <offset> <len>\n", argv[0].str);
printf("%s write <device> <address> <offset> <len>\n", argv[0].str);
printf("%s dump <device> <offset> <len>\n", argv[0].str);
printf("%s erase <device> <offset> <len>\n", argv[0].str);
printf("%s ioctl <device> <request> <arg>\n", argv[0].str);
printf("%s remove <device>\n", argv[0].str);
printf("%s test <device>\n", argv[0].str);
#if WITH_LIB_PARTITION
printf("%s partscan <device> [offset]\n", argv[0].str);
#endif
#if WITH_LIB_CKSUM
printf("%s crc32 <device> <offset> <len> [repeat]\n", argv[0].str);
#endif
return -1;
}
if (!strcmp(argv[1].str, "list")) {
bio_dump_devices();
} else if (!strcmp(argv[1].str, "read")) {
if (argc < 6) goto notenoughargs;
addr_t address = argv[3].u;
off_t offset = argv[4].u; // XXX use long
size_t len = argv[5].u;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
lk_time_t t = current_time();
ssize_t err = bio_read(dev, (void *)address, offset, len);
t = current_time() - t;
dprintf(INFO, "bio_read returns %d, took %u msecs (%d bytes/sec)\n", (int)err, (uint)t, (uint32_t)((uint64_t)err * 1000 / t));
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "write")) {
if (argc < 6) goto notenoughargs;
addr_t address = argv[3].u;
off_t offset = argv[4].u; // XXX use long
size_t len = argv[5].u;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
lk_time_t t = current_time();
ssize_t err = bio_write(dev, (void *)address, offset, len);
t = current_time() - t;
dprintf(INFO, "bio_write returns %d, took %u msecs (%d bytes/sec)\n", (int)err, (uint)t, (uint32_t)((uint64_t)err * 1000 / t));
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "dump")) {
if (argc < 5) {
printf("not enough arguments:\n");
goto usage;
}
off_t offset = argv[3].u; // XXX use long
size_t len = argv[4].u;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
uint8_t *buf = memalign(CACHE_LINE, 256);
ssize_t err = 0;
while (len > 0) {
size_t amt = MIN(256, len);
ssize_t err = bio_read(dev, buf, offset, amt);
if (err < 0) {
dprintf(ALWAYS, "read error %s %zu@%zu (err %d)\n",
argv[2].str, amt, (size_t)offset, (int)err);
break;
}
DEBUG_ASSERT((size_t)err <= amt);
hexdump8_ex(buf, err, offset);
if ((size_t)err != amt) {
dprintf(ALWAYS, "short read from %s @%zu (wanted %zu, got %zu)\n",
argv[2].str, (size_t)offset, amt, (size_t)err);
break;
}
offset += amt;
len -= amt;
}
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "erase")) {
if (argc < 5) goto notenoughargs;
off_t offset = argv[3].u; // XXX use long
size_t len = argv[4].u;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
lk_time_t t = current_time();
ssize_t err = bio_erase(dev, offset, len);
t = current_time() - t;
dprintf(INFO, "bio_erase returns %d, took %u msecs (%d bytes/sec)\n", (int)err, (uint)t, (uint32_t)((uint64_t)err * 1000 / t));
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "ioctl")) {
if (argc < 4) goto notenoughargs;
int request = argv[3].u;
int arg = (argc == 5) ? argv[4].u : 0;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
int err = bio_ioctl(dev, request, (void *)arg);
dprintf(INFO, "bio_ioctl returns %d\n", err);
bio_close(dev);
rc = err;
} else if (!strcmp(argv[1].str, "remove")) {
if (argc < 3) goto notenoughargs;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
bio_unregister_device(dev);
bio_close(dev);
} else if (!strcmp(argv[1].str, "test")) {
if (argc < 3) goto notenoughargs;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
int err = bio_test_device(dev);
bio_close(dev);
rc = err;
#if WITH_LIB_PARTITION
} else if (!strcmp(argv[1].str, "partscan")) {
if (argc < 3) goto notenoughargs;
off_t offset = 0;
if (argc > 3)
offset = argv[3].u;
rc = partition_publish(argv[2].str, offset);
dprintf(INFO, "partition_publish returns %d\n", rc);
#endif
#if WITH_LIB_CKSUM
} else if (!strcmp(argv[1].str, "crc32")) {
if (argc < 5) goto notenoughargs;
off_t offset = argv[3].u; // XXX use long
size_t len = argv[4].u;
bdev_t *dev = bio_open(argv[2].str);
if (!dev) {
printf("error opening block device\n");
return -1;
}
void *buf = malloc(dev->block_size);
bool repeat = false;
if (argc >= 6 && !strcmp(argv[5].str, "repeat")) {
repeat = true;
}
do {
ulong crc = 0;
off_t pos = offset;
while (pos < offset + len) {
ssize_t err = bio_read(dev, buf, pos, MIN(len - (pos - offset), dev->block_size));
if (err <= 0) {
printf("error reading at offset 0x%llx\n", offset + pos);
break;
}
crc = crc32(crc, buf, err);
pos += err;
}
printf("crc 0x%08lx\n", crc);
} while (repeat);
bio_close(dev);
free(buf);
#endif
} else {
printf("unrecognized subcommand\n");
goto usage;
}
return rc;
}
int eel_call(int handle, int pos)
{
int res = 1;
int depth = 0;
eel_push_context();
eel_current.script = handle;
eel_current.bio = bio_open(eel_scripttab[handle].data,
eel_scripttab[handle].len);
if(!eel_current.bio)
{
eel_error("INTERNAL ERROR: Couldn't read script!");
eel_pop_context();
return -1;
}
bio_seek(eel_current.bio, pos, SEEK_SET);
eel_current.lval = NULL;
while(res > 0)
{
/* Start of statement */
eel_clear_args(0);
eel_current.arg = 0;
switch(eel_lex(0))
{
case 0:
/* End of script */
res = 0;
break;
case ';':
/* Empty statement */
res = 1;
break;
case '{':
/* Begin scope */
eel_push_scope();
++depth;
res = 1;
break;
case '}':
/* End scope */
if(depth)
{
eel_pop_scope();
--depth;
}
else
res = 0;
break;
case TK_NEWSYM:
res = assignment(TK_NEWSYM);
break;
case TK_SYMREF:
switch(eel_current.lval->value.sym->type)
{
case EST_CONSTANT: /* Just to get a more
* sensible error message...
*/
case EST_UNDEFINED:
case EST_VARIABLE:
res = assignment(TK_SYMREF);
break;
/* case EST_COMMAND:
res = command();
break;*/
case EST_FUNCTION:
res = function();
break;
case EST_DIRECTIVE:
case EST_SPECIAL:
res = directive();
break;
case EST_ENUM:
case EST_LABEL:
eel_error("Syntax error!");
res = -1;
break;
case EST_OPERATOR:
res = command();
break;
default:
eel_error("INTERNAL ERROR: Lexer returned"
" symbol of illegal type!");
res = -1;
break;
}
break;
default:
eel_error("Unexpected character!");
res = -1;
break;
}
}
eel_current.arg = 0;
bio_close(eel_current.bio);
eel_pop_context();
return res;
}
static int function(void)
{
int arg, res;
eel_symbol_t *func = eel_current.lval->value.sym;
eel_push_scope();
/* Grab arguments */
res = eel_parse_args(",", ';');
/* Enter function */
eel_push_context();
if(eel_current.script == func->token)
eel_current.bio = bio_clone(eel_current.bio);
else
eel_current.bio = bio_open(eel_scripttab[func->token].data,
eel_scripttab[func->token].len);
if(!eel_current.bio)
{
eel_error("INTERNAL ERROR: Failed to set up script"
" reading at start of function!");
eel_pop_context();
eel_pop_scope();
return -1;
}
res = bio_seek(eel_current.bio, func->data.value.a, SEEK_SET);
/*
* Find out where to stuff the arguments.
*/
for(arg = 0; (arg < eel_arg_count) && (res >= 0); )
switch(eel_lex(0))
{
case ',':
/* Already verified, so we just skip them. */
break;
case TK_NEWSYM:
{
eel_symbol_t *sym;
sym = eel_set_data(eel_current.lval->value.s,
eel_args + arg);
if(sym)
{
sym->type = EST_VARIABLE;
++arg;
}
else
{
eel_error("INTERNAL ERROR: Failed to "
"create argument variable!");
res = -1;
}
break;
}
case TK_SYMREF:
eel_error("Function argument clashes with "
"previously defined symbol!");
res = -1;
break;
default:
eel_error("Syntax error in argument list!");
res = -1;
break;
}
/* Find start of body ("the code") */
if(res >= 0)
{
if(eel_lex(0) != ')')
{
eel_error("Expected ')'!");
res = -1;
}
else if(eel_lex(0) != '{')
{
eel_error("Expected '{'!");
res = -1;
}
}
if(res >= 0)
{
/*
* Execute function
*
* Note that this is a simple, inefficient
* RECURSIVE implementation!
*
* Alternatively, we could set up a "trigger"
* to run "the rest of this function" when
* the function ends - and then just return.
*/
res = eel_call(eel_current.script, bio_tell(eel_current.bio));
}
/* Leave function */
bio_close(eel_current.bio);
eel_pop_context();
eel_pop_scope();
if(res >= 0)
return 1;
else
return res;
}
// return NULL for success, error string for failure
const char *lkb_handle_command(lkb_t *lkb, const char *cmd, const char *arg, unsigned len) {
struct lkb_command *lcmd;
for (lcmd = lkb_cmd_list; lcmd; lcmd = lcmd->next) {
if (!strcmp(lcmd->name, cmd)) {
return lcmd->handler(lkb, arg, len, lcmd->cookie);
}
}
if (len > lkb_iobuffer_size) {
return "buffer too small";
}
if (!strcmp(cmd, "flash") || !strcmp(cmd, "erase")) {
struct ptable_entry entry;
bdev_t *bdev;
if (ptable_find(arg, &entry) < 0) {
return "no such partition";
}
if (len > entry.length) {
return "partition too small";
}
if (lkb_read(lkb, lkb_iobuffer, len)) {
return "io error";
}
if (!(bdev = bio_open(bootdevice))) {
return "bio_open failed";
}
if (bio_erase(bdev, entry.offset, entry.length) != (ssize_t)entry.length) {
bio_close(bdev);
return "bio_erase failed";
}
if (!strcmp(cmd, "flash")) {
if (bio_write(bdev, lkb_iobuffer, entry.offset, len) != (ssize_t)len) {
bio_close(bdev);
return "bio_write failed";
}
}
bio_close(bdev);
return NULL;
} else if (!strcmp(cmd, "fpga")) {
#if PLATFORM_ZYNQ
unsigned *x = lkb_iobuffer;
if (lkb_read(lkb, lkb_iobuffer, len)) {
return "io error";
}
for (unsigned n = 0; n < len; n+= 4) {
*x = SWAP_32(*x);
x++;
}
zynq_reset_fpga();
zynq_program_fpga(lkb_iobuffer_phys, len);
return NULL;
#else
return "no fpga";
#endif
} else if (!strcmp(cmd, "boot")) {
if (lkb_read(lkb, lkb_iobuffer, len)) {
return "io error";
}
thread_resume(thread_create("ramboot", &do_ramboot, NULL,
DEFAULT_PRIORITY, DEFAULT_STACK_SIZE));
return NULL;
} else if (!strcmp(cmd, "getsysparam")) {
const void *ptr;
size_t len;
if (sysparam_get_ptr(arg, &ptr, &len) == 0) {
lkb_write(lkb, ptr, len);
}
return NULL;
} else if (!strcmp(cmd, "reboot")) {
thread_resume(thread_create("reboot", &do_reboot, NULL,
DEFAULT_PRIORITY, DEFAULT_STACK_SIZE));
return NULL;
} else {
return "unknown command";
}
}
// return NULL for success, error string for failure
const char *lkb_handle_command(lkb_t *lkb, const char *cmd, const char *arg, unsigned len) {
struct lkb_command *lcmd;
for (lcmd = lkb_cmd_list; lcmd; lcmd = lcmd->next) {
if (!strcmp(lcmd->name, cmd)) {
return lcmd->handler(lkb, arg, len, lcmd->cookie);
}
}
if (len > lkb_iobuffer_size) {
return "buffer too small";
}
if (!strcmp(cmd, "flash") || !strcmp(cmd, "erase")) {
struct ptable_entry entry;
bdev_t *bdev;
if (ptable_find(arg, &entry) < 0) {
size_t plen = len;
/* doesn't exist, make one */
#if PLATFORM_ZYNQ
/* XXX not really the right place, should be in the ptable/bio layer */
plen = ROUNDUP(plen, 256*1024);
#endif
off_t off = ptable_allocate(plen, 0);
if (off < 0) {
return "no space to allocate partition";
}
if (ptable_add(arg, off, plen, 0) < 0) {
return "error creating partition";
}
if (ptable_find(arg, &entry) < 0) {
return "couldn't find partition after creating it";
}
}
if (len > entry.length) {
return "partition too small";
}
if (lkb_read(lkb, lkb_iobuffer, len)) {
return "io error";
}
if (!(bdev = bio_open(bootdevice))) {
return "bio_open failed";
}
if (bio_erase(bdev, entry.offset, entry.length) != (ssize_t)entry.length) {
bio_close(bdev);
return "bio_erase failed";
}
if (!strcmp(cmd, "flash")) {
if (bio_write(bdev, lkb_iobuffer, entry.offset, len) != (ssize_t)len) {
bio_close(bdev);
return "bio_write failed";
}
}
bio_close(bdev);
return NULL;
} else if (!strcmp(cmd, "remove")) {
if (ptable_remove(arg) < 0) {
return "remove failed";
}
return NULL;
} else if (!strcmp(cmd, "fpga")) {
#if PLATFORM_ZYNQ
unsigned *x = lkb_iobuffer;
if (lkb_read(lkb, lkb_iobuffer, len)) {
return "io error";
}
for (unsigned n = 0; n < len; n+= 4) {
*x = SWAP_32(*x);
x++;
}
zynq_reset_fpga();
zynq_program_fpga(lkb_iobuffer_phys, len);
return NULL;
#else
return "no fpga";
#endif
} else if (!strcmp(cmd, "boot")) {
if (lkb_read(lkb, lkb_iobuffer, len)) {
return "io error";
}
thread_resume(thread_create("boot", &do_boot, NULL,
DEFAULT_PRIORITY, DEFAULT_STACK_SIZE));
return NULL;
} else if (!strcmp(cmd, "getsysparam")) {
const void *ptr;
size_t len;
if (sysparam_get_ptr(arg, &ptr, &len) == 0) {
lkb_write(lkb, ptr, len);
}
return NULL;
} else if (!strcmp(cmd, "reboot")) {
thread_resume(thread_create("reboot", &do_reboot, NULL,
DEFAULT_PRIORITY, DEFAULT_STACK_SIZE));
return NULL;
} else {
return "unknown command";
}
}