1 #include <linux/sched.h>
2 #include <linux/slab.h>
3 #include <asm/processor.h>
7 int init_fpu(struct task_struct *tsk)
9 if (tsk_used_math(tsk)) {
10 if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
11 unlazy_fpu(tsk, task_pt_regs(tsk));
16 * Memory allocation at the first usage of the FPU and other state.
18 if (!tsk->thread.xstate) {
19 tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
21 if (!tsk->thread.xstate)
25 if (boot_cpu_data.flags & CPU_HAS_FPU) {
26 struct sh_fpu_hard_struct *fp = &tsk->thread.xstate->hardfpu;
27 memset(fp, 0, xstate_size);
28 fp->fpscr = FPSCR_INIT;
30 struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu;
31 memset(fp, 0, xstate_size);
32 fp->fpscr = FPSCR_INIT;
35 set_stopped_child_used_math(tsk);
40 void __fpu_state_restore(void)
42 struct task_struct *tsk = current;
46 task_thread_info(tsk)->status |= TS_USEDFPU;
47 tsk->thread.fpu_counter++;
50 void fpu_state_restore(struct pt_regs *regs)
52 struct task_struct *tsk = current;
54 if (unlikely(!user_mode(regs))) {
55 printk(KERN_ERR "BUG: FPU is used in kernel mode.\n");
60 if (!tsk_used_math(tsk)) {
63 * does a slab alloc which can sleep
69 do_group_exit(SIGKILL);
77 __fpu_state_restore();
80 BUILD_TRAP_HANDLER(fpu_state_restore)
84 fpu_state_restore(regs);
86 #endif /* CONFIG_SH_FPU */