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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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arch/x86/kernel/process_64.c
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@@ -396,7 +396,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
/* we're going to use this soon, after a few expensive things */
if (preload_fpu)
prefetch(next->xstate);
prefetch(next->fpu.state);
/*
* Reload esp0, LDT and the page table pointer: