diff options
| author | Ingo Molnar <mingo@kernel.org> | 2015-04-26 14:40:54 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 15:47:45 +0200 |
| commit | 2e2f3da7714f323a0db65baa19b2b8110cc23f95 (patch) | |
| tree | fc72fcf6cc5b0bf753029dcfd36b76e27471128f /arch/x86/kernel/fpu/init.c | |
| parent | 7218e8b723dc9ceb71cf2fbd3d019e9e11b7d3cf (diff) | |
x86/fpu: Factor out fpu__init_system_early_generic()
Move the generic bits of fpu__detect() into fpu__init_system_early_generic().
We'll move some other code here too in a followup patch.
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>
Diffstat (limited to 'arch/x86/kernel/fpu/init.c')
| -rw-r--r-- | arch/x86/kernel/fpu/init.c | 41 |
1 files changed, 24 insertions, 17 deletions
diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c index c3f3a89cbbf6..3637c509956d 100644 --- a/arch/x86/kernel/fpu/init.c +++ b/arch/x86/kernel/fpu/init.c @@ -65,6 +65,29 @@ void fpu__init_check_bugs(void) } /* + * The earliest FPU detection code: + */ +static void fpu__init_system_early_generic(struct cpuinfo_x86 *c) +{ + unsigned long cr0; + u16 fsw, fcw; + + fsw = fcw = 0xffff; + + cr0 = read_cr0(); + cr0 &= ~(X86_CR0_TS | X86_CR0_EM); + write_cr0(cr0); + + asm volatile("fninit ; fnstsw %0 ; fnstcw %1" + : "+m" (fsw), "+m" (fcw)); + + if (fsw == 0 && (fcw & 0x103f) == 0x003f) + set_cpu_cap(c, X86_FEATURE_FPU); + else + clear_cpu_cap(c, X86_FEATURE_FPU); +} + +/* * Boot time FPU feature detection code: */ unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu; @@ -269,23 +292,7 @@ __setup("no387", no_387); */ void fpu__detect(struct cpuinfo_x86 *c) { - unsigned long cr0; - u16 fsw, fcw; - - fsw = fcw = 0xffff; - - cr0 = read_cr0(); - cr0 &= ~(X86_CR0_TS | X86_CR0_EM); - write_cr0(cr0); - - asm volatile("fninit ; fnstsw %0 ; fnstcw %1" - : "+m" (fsw), "+m" (fcw)); - - if (fsw == 0 && (fcw & 0x103f) == 0x003f) - set_cpu_cap(c, X86_FEATURE_FPU); - else - clear_cpu_cap(c, X86_FEATURE_FPU); - + fpu__init_system_early_generic(c); fpu__init_system(); /* The final cr0 value is set later, in fpu_init() */ } |