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x86, xsave: Separate fpu and xsave initialization

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As xsave also supports other than fpu features, it should be
initialized independently of the fpu. This patch moves this out of fpu
initialization.

There is also a lot of cross referencing between fpu and xsave
code. This patch reduces this by making xsave_cntxt_init() and
init_thread_xstate() static functions.

The patch moves the cpu_has_xsave check at the beginning of
xsave_init(). All other checks may removed then.

Signed-off-by: Robert Richter <robert.richter@amd.com>
LKML-Reference: <1279731838-1522-2-git-send-email-robert.richter@amd.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Robert Richter
2010-07-21 19:03:52 +02:00
committed by H. Peter Anvin
parent 82d4150cec
commit 0e49bf66d2
5 changed files with 26 additions and 15 deletions
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27
arch/x86/kernel/i387.c
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@@ -59,18 +59,18 @@ void __cpuinit mxcsr_feature_mask_init(void)
stts();
}
void __cpuinit init_thread_xstate(void)
static void __cpuinit init_thread_xstate(void)
{
/*
* Note that xstate_size might be overwriten later during
* xsave_init().
*/
if (!HAVE_HWFP) {
xstate_size = sizeof(struct i387_soft_struct);
return;
}
if (cpu_has_xsave) {
xsave_cntxt_init();
return;
}
if (cpu_has_fxsr)
xstate_size = sizeof(struct i387_fxsave_struct);
#ifdef CONFIG_X86_32
@@ -84,6 +84,7 @@ void __cpuinit init_thread_xstate(void)
* Called at bootup to set up the initial FPU state that is later cloned
* into all processes.
*/
void __cpuinit fpu_init(void)
{
unsigned long oldcr0 = read_cr0();
@@ -93,14 +94,24 @@ void __cpuinit fpu_init(void)
write_cr0(oldcr0 & ~(X86_CR0_TS|X86_CR0_EM)); /* clear TS and EM */
xsave_init();
if (!smp_processor_id())
init_thread_xstate();
mxcsr_feature_mask_init();
/* clean state in init */
current_thread_info()->status = 0;
clear_used_math();
}
#endif /* CONFIG_X86_64 */
#else /* CONFIG_X86_64 */
void __cpuinit fpu_init(void)
{
if (!smp_processor_id())
init_thread_xstate();
}
#endif /* CONFIG_X86_32 */
static void fpu_finit(struct fpu *fpu)
{