Changeset 3b05862f in mainline for arch/ia32/src/cpu/cpu.c

Timestamp:

2006-03-15T16:12:37Z (19 years ago)

Author:

Jakub Vana <jakub.vana@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

2f7342d

Parents:

b629483

Message:

ia32 MMX and SSEx support

File:

• arch/ia32/src/cpu/cpu.c (modified) (1 diff)

arch/ia32/src/cpu/cpu.c

@@ -93 +93 @@
 void cpu_arch_init(void)
 {
+        __u32 help=0;
+        
         CPU->arch.tss = tss_p;
         CPU->fpu_owner=NULL;
+
+        cpuid_feature_info fi;
+        cpuid_extended_feature_info efi;
+
+        cpu_info_t info;
+        cpuid(1, &info);
+
+        fi.word=info.cpuid_edx;
+        efi.word=info.cpuid_ecx;
+        
+        if(fi.bits.fxsr)        fpu_fxsr();
+        else fpu_fsr(); 
+        
+        if(fi.bits.sse) asm volatile (
+                "mov %%cr4,%0;\n"
+                "or %1,%0;\n"
+                "mov %0,%%cr4;\n"
+                :"+r"(help)
+                :"i"(CR4_OSFXSR_MASK|(1<<10)) 
+        );
+        
 }