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| author | Brian Gerst <brgerst@gmail.com> | 2010-09-03 21:17:09 -0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-09-09 14:16:20 -0700 |
| commit | 6ac8bac2684235f4caf22a410549c582aa7327d6 (patch) | |
| tree | d376c2c06ffa1461219f5370497d220cd4afefb0 /arch/x86/kernel/i387.c | |
| parent | 2df7a6e9e8e67c19e5fe2eac3f2d2223b7bb4a7b (diff) | |
| download | lwn-6ac8bac2684235f4caf22a410549c582aa7327d6.tar.gz lwn-6ac8bac2684235f4caf22a410549c582aa7327d6.zip | |
x86, fpu: Merge fpu_init()
Make fpu_init() handle 32-bit setup.
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <1283563039-3466-3-git-send-email-brgerst@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/i387.c')
| -rw-r--r-- | arch/x86/kernel/i387.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index 2605c50b11d3..82166519497a 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -85,7 +85,6 @@ static void __cpuinit init_thread_xstate(void) #endif } -#ifdef CONFIG_X86_64 /* * Called at bootup to set up the initial FPU state that is later cloned * into all processes. @@ -93,12 +92,21 @@ static void __cpuinit init_thread_xstate(void) void __cpuinit fpu_init(void) { - unsigned long oldcr0 = read_cr0(); - - set_in_cr4(X86_CR4_OSFXSR); - set_in_cr4(X86_CR4_OSXMMEXCPT); + unsigned long cr0; + unsigned long cr4_mask = 0; - write_cr0(oldcr0 & ~(X86_CR0_TS|X86_CR0_EM)); /* clear TS and EM */ + if (cpu_has_fxsr) + cr4_mask |= X86_CR4_OSFXSR; + if (cpu_has_xmm) + cr4_mask |= X86_CR4_OSXMMEXCPT; + if (cr4_mask) + set_in_cr4(cr4_mask); + + cr0 = read_cr0(); + cr0 &= ~(X86_CR0_TS|X86_CR0_EM); /* clear TS and EM */ + if (!HAVE_HWFP) + cr0 |= X86_CR0_EM; + write_cr0(cr0); if (!smp_processor_id()) init_thread_xstate(); @@ -109,16 +117,6 @@ void __cpuinit fpu_init(void) clear_used_math(); } -#else /* CONFIG_X86_64 */ - -void __cpuinit fpu_init(void) -{ - if (!smp_processor_id()) - init_thread_xstate(); -} - -#endif /* CONFIG_X86_32 */ - void fpu_finit(struct fpu *fpu) { #ifdef CONFIG_X86_32 |