From d43c6e8083ac8baeb1a167510aea34fcef396e33 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Fri, 6 Jan 2006 00:11:49 -0800 Subject: [PATCH] i386: move SIMD initialization Move some code unrelated to any dealing with hardware bugs from i386's bugs.h to a more logical place. Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/traps.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'arch/i386') diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c index bb36a989db77..f0c4060bd4d5 100644 --- a/arch/i386/kernel/traps.c +++ b/arch/i386/kernel/traps.c @@ -1098,6 +1098,28 @@ void __init trap_init(void) #endif set_trap_gate(19,&simd_coprocessor_error); + if (cpu_has_fxsr) { + /* + * Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned. + * Generates a compile-time "error: zero width for bit-field" if + * the alignment is wrong. + */ + struct fxsrAlignAssert { + int _:!(offsetof(struct task_struct, + thread.i387.fxsave) & 15); + }; + + printk(KERN_INFO "Enabling fast FPU save and restore... "); + set_in_cr4(X86_CR4_OSFXSR); + printk("done.\n"); + } + if (cpu_has_xmm) { + printk(KERN_INFO "Enabling unmasked SIMD FPU exception " + "support... "); + set_in_cr4(X86_CR4_OSXMMEXCPT); + printk("done.\n"); + } + set_system_gate(SYSCALL_VECTOR,&system_call); /* -- cgit v1.2.1