- /* this must be called from a function that has an exclusive lock
- * on all_threads
- */
- struct user_desc ldt_entry = {
- 1, 0, 0, /* index, address, length filled in later */
- 1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1
- };
- int n;
- get_spinlock(&modify_ldt_lock,thread);
- n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy);
- /* get next free ldt entry */
-
- if(n) {
- u32 *p;
- for(n=0,p=local_ldt_copy;*p;p+=LDT_ENTRY_SIZE/sizeof(u32))
- n++;
- }
- ldt_entry.entry_number=n;
- ldt_entry.base_addr=(unsigned long) thread;
- ldt_entry.limit=dynamic_values_bytes;
- ldt_entry.limit_in_pages=0;
- if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) {
- modify_ldt_lock=0;
- /* modify_ldt call failed: something magical is not happening */
- return -1;
- }
- __asm__ __volatile__ ("movw %w0, %%fs" : : "q"
- ((n << 3) /* selector number */
- + (1 << 2) /* TI set = LDT */
- + 3)); /* privilege level */
- thread->tls_cookie=n;
- modify_ldt_lock=0;
-
- if(n<0) return 0;