/*
* Construct one requested file entry, or all file entries, in a PID directory.
*/
static void
construct_pid_entries(struct inode * parent, char * name)
{
int slot;
slot = get_inode_index(parent);
assert(slot >= 0 && slot < NR_TASKS + NR_PROCS);
/* If this process is already gone, delete the directory now. */
if (!slot_in_use(slot)) {
delete_inode(parent);
return;
}
/*
* If a specific file name is being looked up, see if we have to add
* an inode for that file. If the directory contents are being
* retrieved, add all files that have not yet been added.
*/
if (name != NULL)
make_one_pid_entry(parent, name, slot);
else
make_all_pid_entries(parent, slot);
}
static void *atben_open(const char *arg)
{
struct atben_dsc *dsc;
if (slot_in_use())
return NULL;
dsc = malloc(sizeof(*dsc));
if (!dsc) {
perror("malloc");
exit(1);
}
dsc->fd = open("/dev/mem", O_RDWR | O_SYNC);
if (dsc->fd < 0) {
perror("/dev/mem");
exit(1);
}
dsc->mem = mmap(NULL, PAGE_SIZE*3*16, PROT_READ | PROT_WRITE,
MAP_SHARED, dsc->fd, SOC_BASE);
if (dsc->mem == MAP_FAILED) {
perror("mmap");
exit(1);
}
/* set the output levels */
PDDATS = nSEL | VDD_OFF;
PDDATC = SCLK;
/* take the GPIOs away from the MMC controller */
#ifdef OLD
PDFUNC = MOSI | MISO | SCLK | IRQ | nSEL;
PDFUNS = CLK;
#else
PDFUNC = MOSI | MISO | SCLK | IRQ | nSEL | SLP_TR;
#endif
/* set the pin directions */
PDDIRC = MISO | IRQ;
#ifdef OLD
PDDIRS = MOSI | CLK | SCLK | nSEL;
#else
PDDIRS = MOSI | SLP_TR | SCLK | nSEL;
#endif
/* let capacitors precharge */
wait_for_power();
/* enable power */
PDDATC = VDD_OFF;
#ifdef OLD
/* set the MSC clock to 336 MHz / 21 = 16 MHz */
MSCCDR = 20;
/*
* Enable the MSC clock. We need to do this before accessing any
* registers of the MSC block !
*/
CLKGR &= ~(1 << 7);
/* bus clock = MSC clock / 1 */
MSC_CLKRT = 0;
/* start MMC clock output */
MSC_STRPCL = 2;
#endif
wait_for_power();
atben_reset_rf(dsc);
return dsc;
}
/*
* Regenerate the set of PID directories in the root directory of the file
* system. Add new directories and delete old directories as appropriate;
* leave unchanged those that should remain the same.
*/
static void
construct_pid_dirs(void)
{
/*
* We have to make two passes. Otherwise, we would trigger a vtreefs
* assert when we add an entry for a PID before deleting the previous
* entry for that PID. While rare, such rapid PID reuse does occur in
* practice.
*/
struct inode *root, *node;
struct inode_stat stat;
char name[PNAME_MAX+1];
pid_t pid;
int i;
root = get_root_inode();
/* First pass: delete old entries. */
for (i = 0; i < NR_PROCS + NR_TASKS; i++) {
/* Do we already have an inode associated with this slot? */
node = get_inode_by_index(root, i);
if (node == NULL)
continue;
/*
* If the process slot is not in use, delete the associated
* inode.
*/
if (!slot_in_use(i)) {
delete_inode(node);
continue;
}
/* Otherwise, get the process ID. */
if (i < NR_TASKS)
pid = (pid_t)(i - NR_TASKS);
else
pid = mproc[i - NR_TASKS].mp_pid;
/*
* If there is an old entry, see if the pid matches the current
* entry, and the owner is still the same. Otherwise, delete
* the old entry first. We reconstruct the entire subtree even
* if only the owner changed, for security reasons: if a
* process could keep open a file or directory across the owner
* change, it might be able to access information it shouldn't.
*/
if (pid != (pid_t)get_inode_cbdata(node) ||
!check_owner(node, i))
delete_inode(node);
}
/* Second pass: add new entries. */
for (i = 0; i < NR_PROCS + NR_TASKS; i++) {
/* If the process slot is not in use, skip this slot. */
if (!slot_in_use(i))
continue;
/*
* If we have an inode associated with this slot, we have
* already checked it to be up-to-date above.
*/
if (get_inode_by_index(root, i) != NULL)
continue;
/* Get the process ID. */
if (i < NR_TASKS)
pid = (pid_t)(i - NR_TASKS);
else
pid = mproc[i - NR_TASKS].mp_pid;
/* Add the entry for the process slot. */
snprintf(name, PNAME_MAX + 1, "%d", pid);
make_stat(&stat, i, NO_INDEX);
node = add_inode(root, name, i, &stat, nr_pid_entries,
(cbdata_t)pid);
if (node == NULL)
out_of_inodes();
}
}
