Make sure SSE is enabled

3 years ago · 1d5cec5fb2
parent bfb6ad022c
commit 1d5cec5fb2
1 changed files with 9 additions and 0 deletions
--- a/uefi/crt_x86_64.c
+++ b/uefi/crt_x86_64.c
@ -180,6 +180,15 @@ int uefi_init (
 #else
    (void)i;
 #endif
+    /* make sure SSE is enabled, because some say there are buggy firmware in the wild not doing that */
+    __asm__ __volatile__ (
+    "	movq %cr0, %rax\n"
+    "	andb $0xF1, %al\n"
+    "	movq %rax, %cr0\n"
+    "	movq %cr4, %rax\n"
+    "	orw $3 << 9, %ax\n"
+    "	mov %rax, %cr4\n"
+    );
    /* save EFI pointers and loaded image into globals */
    IM = image;
    ST = systab;