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x86/fpu: Reorder init methods 

Reorder init methods in order of their relationship and usage, to
form coherent blocks throughout the whole file.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-26 15:32:40 +02:00
parent 7638b74b56
commit 41e78410d8
1 changed files with 49 additions and 47 deletions
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96
arch/x86/kernel/fpu/init.c
View File

@ -4,6 +4,46 @@
#include <asm/fpu/internal.h>
#include <asm/tlbflush.h>
static void fpu__init_cpu_ctx_switch(void)
{
if (!cpu_has_eager_fpu)
stts();
else
clts();
}
/*
* Initialize the registers found in all CPUs, CR0 and CR4:
*/
static void fpu__init_cpu_generic(void)
{
unsigned long cr0;
unsigned long cr4_mask = 0;
if (cpu_has_fxsr)
cr4_mask |= X86_CR4_OSFXSR;
if (cpu_has_xmm)
cr4_mask |= X86_CR4_OSXMMEXCPT;
if (cr4_mask)
cr4_set_bits(cr4_mask);
cr0 = read_cr0();
cr0 &= ~(X86_CR0_TS|X86_CR0_EM); /* clear TS and EM */
if (!cpu_has_fpu)
cr0 |= X86_CR0_EM;
write_cr0(cr0);
}
/*
* Enable all supported FPU features. Called when a CPU is brought online.
*/
void fpu__init_cpu(void)
{
fpu__init_cpu_generic();
fpu__init_cpu_xstate();
fpu__init_cpu_ctx_switch();
}
/*
* The earliest FPU detection code.
*
@ -44,9 +84,6 @@ static void fpu__init_system_early_generic(struct cpuinfo_x86 *c)
*/
unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu;
unsigned int xstate_size;
EXPORT_SYMBOL_GPL(xstate_size);
static void fpu__init_system_mxcsr(void)
{
unsigned int mask = 0;
@ -83,6 +120,15 @@ static void fpu__init_system_generic(void)
fpu__init_system_mxcsr();
}
unsigned int xstate_size;
EXPORT_SYMBOL_GPL(xstate_size);
/*
* Set up the xstate_size based on the legacy FPU context size.
*
* We set this up first, and later it will be overwritten by
* fpu__init_system_xstate() if the CPU knows about xstates.
*/
static void fpu__init_system_xstate_size_legacy(void)
{
static bool on_boot_cpu = 1;
@ -112,50 +158,6 @@ static void fpu__init_system_xstate_size_legacy(void)
}
}
/*
* Initialize the TS bit in CR0 according to the style of context-switches
* we are using:
*/
static void fpu__init_cpu_ctx_switch(void)
{
if (!cpu_has_eager_fpu)
stts();
else
clts();
}
/*
* Initialize the registers found in all CPUs, CR0 and CR4:
*/
static void fpu__init_cpu_generic(void)
{
unsigned long cr0;
unsigned long cr4_mask = 0;
if (cpu_has_fxsr)
cr4_mask |= X86_CR4_OSFXSR;
if (cpu_has_xmm)
cr4_mask |= X86_CR4_OSXMMEXCPT;
if (cr4_mask)
cr4_set_bits(cr4_mask);
cr0 = read_cr0();
cr0 &= ~(X86_CR0_TS|X86_CR0_EM); /* clear TS and EM */
if (!cpu_has_fpu)
cr0 |= X86_CR0_EM;
write_cr0(cr0);
}
/*
* Enable all supported FPU features. Called when a CPU is brought online.
*/
void fpu__init_cpu(void)
{
fpu__init_cpu_generic();
fpu__init_cpu_xstate();
fpu__init_cpu_ctx_switch();
}
static enum { AUTO, ENABLE, DISABLE } eagerfpu = AUTO;
static int __init eager_fpu_setup(char *s)