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Linux/arch/sh/kernel/cpu/fpu.c

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  1 #include <linux/sched.h>
  2 #include <linux/slab.h>
  3 #include <asm/processor.h>
  4 #include <asm/fpu.h>
  5 #include <asm/traps.h>
  6 
  7 int init_fpu(struct task_struct *tsk)
  8 {
  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));
 12                 return 0;
 13         }
 14 
 15         /*
 16          * Memory allocation at the first usage of the FPU and other state.
 17          */
 18         if (!tsk->thread.xstate) {
 19                 tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
 20                                                       GFP_KERNEL);
 21                 if (!tsk->thread.xstate)
 22                         return -ENOMEM;
 23         }
 24 
 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;
 29         } else {
 30                 struct sh_fpu_soft_struct *fp = &tsk->thread.xstate->softfpu;
 31                 memset(fp, 0, xstate_size);
 32                 fp->fpscr = FPSCR_INIT;
 33         }
 34 
 35         set_stopped_child_used_math(tsk);
 36         return 0;
 37 }
 38 
 39 #ifdef CONFIG_SH_FPU
 40 void __fpu_state_restore(void)
 41 {
 42         struct task_struct *tsk = current;
 43 
 44         restore_fpu(tsk);
 45 
 46         task_thread_info(tsk)->status |= TS_USEDFPU;
 47         tsk->thread.fpu_counter++;
 48 }
 49 
 50 void fpu_state_restore(struct pt_regs *regs)
 51 {
 52         struct task_struct *tsk = current;
 53 
 54         if (unlikely(!user_mode(regs))) {
 55                 printk(KERN_ERR "BUG: FPU is used in kernel mode.\n");
 56                 BUG();
 57                 return;
 58         }
 59 
 60         if (!tsk_used_math(tsk)) {
 61                 local_irq_enable();
 62                 /*
 63                  * does a slab alloc which can sleep
 64                  */
 65                 if (init_fpu(tsk)) {
 66                         /*
 67                          * ran out of memory!
 68                          */
 69                         do_group_exit(SIGKILL);
 70                         return;
 71                 }
 72                 local_irq_disable();
 73         }
 74 
 75         grab_fpu(regs);
 76 
 77         __fpu_state_restore();
 78 }
 79 
 80 BUILD_TRAP_HANDLER(fpu_state_restore)
 81 {
 82         TRAP_HANDLER_DECL;
 83 
 84         fpu_state_restore(regs);
 85 }
 86 #endif /* CONFIG_SH_FPU */
 87 

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