1 #include <linux/sched.h>
2 #include <linux/slab.h>
3 #include <asm/processor.h>
6 int init_fpu(struct task_struct *tsk)
8 if (tsk_used_math(tsk)) {
9 if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
10 unlazy_fpu(tsk, task_pt_regs(tsk));
15 * Memory allocation at the first usage of the FPU and other state.
17 if (!tsk->thread.xstate) {
18 tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
20 if (!tsk->thread.xstate)
24 if (boot_cpu_data.flags & CPU_HAS_FPU) {
25 struct sh_fpu_hard_struct *fp = &tsk->thread.xstate->hardfpu;
26 memset(fp, 0, xstate_size);
27 fp->fpscr = FPSCR_INIT;
29 struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu;
30 memset(fp, 0, xstate_size);
31 fp->fpscr = FPSCR_INIT;
34 set_stopped_child_used_math(tsk);
39 void __fpu_state_restore(void)
41 struct task_struct *tsk = current;
45 task_thread_info(tsk)->status |= TS_USEDFPU;
49 void fpu_state_restore(struct pt_regs *regs)
51 struct task_struct *tsk = current;
53 if (unlikely(!user_mode(regs))) {
54 printk(KERN_ERR "BUG: FPU is used in kernel mode.\n");
59 if (!tsk_used_math(tsk)) {
62 * does a slab alloc which can sleep
68 do_group_exit(SIGKILL);
76 __fpu_state_restore();
79 BUILD_TRAP_HANDLER(fpu_state_restore)
83 fpu_state_restore(regs);
85 #endif /* CONFIG_SH_FPU */