diff options
Diffstat (limited to 'arch/x86/include/asm/fpu/internal.h')
| -rw-r--r-- | arch/x86/include/asm/fpu/internal.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h index 0c8c812d23b4..89c6ec80c1ac 100644 --- a/arch/x86/include/asm/fpu/internal.h +++ b/arch/x86/include/asm/fpu/internal.h @@ -12,6 +12,7 @@ #include <linux/regset.h> #include <linux/compat.h> +#include <linux/sched.h> #include <linux/slab.h> #include <asm/user.h> @@ -43,6 +44,15 @@ extern void fpu__init_system_xstate(void); extern void fpu__init_cpu_xstate(void); extern void fpu__init_system(struct cpuinfo_x86 *c); +extern int fpstate_alloc_init(struct fpu *fpu); +extern void fpstate_init(struct fpu *fpu); +extern void fpu__clear(struct task_struct *tsk); + +extern int dump_fpu(struct pt_regs *, struct user_i387_struct *); +extern void fpu__restore(void); +extern void fpu__init_check_bugs(void); +extern void fpu__resume_cpu(void); + DECLARE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx); extern void convert_from_fxsr(struct user_i387_ia32_struct *env, @@ -335,6 +345,21 @@ static inline void __fpregs_activate(struct fpu *fpu) } /* + * The question "does this thread have fpu access?" + * is slightly racy, since preemption could come in + * and revoke it immediately after the test. + * + * However, even in that very unlikely scenario, + * we can just assume we have FPU access - typically + * to save the FP state - we'll just take a #NM + * fault and get the FPU access back. + */ +static inline int user_has_fpu(void) +{ + return current->thread.fpu.fpregs_active; +} + +/* * Encapsulate the CR0.TS handling together with the * software flag. * |