mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 23:46:40 +07:00
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>
This commit is contained in:
parent
7218e8b723
commit
2e2f3da771
@ -64,6 +64,29 @@ void fpu__init_check_bugs(void)
|
||||
check_fpu();
|
||||
}
|
||||
|
||||
/*
|
||||
* 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:
|
||||
*/
|
||||
@ -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() */
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user