summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/fpu/api.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/include/asm/fpu/api.h')
-rw-r--r--arch/x86/include/asm/fpu/api.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/x86/include/asm/fpu/api.h b/arch/x86/include/asm/fpu/api.h
index b56d504af654..b774c52e5411 100644
--- a/arch/x86/include/asm/fpu/api.h
+++ b/arch/x86/include/asm/fpu/api.h
@@ -10,6 +10,7 @@
#ifndef _ASM_X86_FPU_API_H
#define _ASM_X86_FPU_API_H
+#include <linux/bottom_half.h>
/*
* Use kernel_fpu_begin/end() if you intend to use FPU in kernel context. It
@@ -21,6 +22,36 @@
extern void kernel_fpu_begin(void);
extern void kernel_fpu_end(void);
extern bool irq_fpu_usable(void);
+extern void fpregs_mark_activate(void);
+
+/*
+ * Use fpregs_lock() while editing CPU's FPU registers or fpu->state.
+ * A context switch will (and softirq might) save CPU's FPU registers to
+ * fpu->state and set TIF_NEED_FPU_LOAD leaving CPU's FPU registers in
+ * a random state.
+ */
+static inline void fpregs_lock(void)
+{
+ preempt_disable();
+ local_bh_disable();
+}
+
+static inline void fpregs_unlock(void)
+{
+ local_bh_enable();
+ preempt_enable();
+}
+
+#ifdef CONFIG_X86_DEBUG_FPU
+extern void fpregs_assert_state_consistent(void);
+#else
+static inline void fpregs_assert_state_consistent(void) { }
+#endif
+
+/*
+ * Load the task FPU state before returning to userspace.
+ */
+extern void switch_fpu_return(void);
/*
* Query the presence of one or more xfeatures. Works on any legacy CPU as well.