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x86: Introduce 'struct fpu' and related API

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Currently all fpu state access is through tsk->thread.xstate.  Since we wish
to generalize fpu access to non-task contexts, wrap the state in a new
'struct fpu' and convert existing access to use an fpu API.

Signal frame handlers are not converted to the API since they will remain
task context only things.

Signed-off-by: Avi Kivity <avi@redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1273135546-29690-3-git-send-email-avi@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Avi Kivity
2010-05-06 11:45:46 +03:00
committed by H. Peter Anvin
parent c9ad488289
commit 8660328332
9 changed files with 165 additions and 108 deletions
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6
arch/x86/include/asm/processor.h
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@ -380,6 +380,10 @@ union thread_xstate {
struct xsave_struct xsave;
};
struct fpu {
union thread_xstate *state;
};
#ifdef CONFIG_X86_64
DECLARE_PER_CPU(struct orig_ist, orig_ist);
@ -457,7 +461,7 @@ struct thread_struct {
unsigned long trap_no;
unsigned long error_code;
/* floating point and extended processor state */
union thread_xstate *xstate;
struct fpu fpu;
#ifdef CONFIG_X86_32
/* Virtual 86 mode info */
struct vm86_struct __user *vm86_info;