1 files changed, 59 insertions, 0 deletions
diff --git a/grub-core/efiemu/i386/coredetect.c b/grub-core/efiemu/i386/coredetect.c
new file mode 100644
index 0000000..975c4aa
--- /dev/null
+++ b/grub-core/efiemu/i386/coredetect.c
@@ -0,0 +1,59 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/efiemu/efiemu.h>
+#include <grub/command.h>
+
+#define cpuid(num,a,b,c,d) \
+  asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1" \
+		: "=a" (a), "=r" (b), "=c" (c), "=d" (d)  \
+		: "0" (num))
+
+#define bit_LM (1 << 29)
+
+char *
+grub_efiemu_get_default_core_name (void)
+{
+
+  unsigned int eax, ebx, ecx, edx;
+  unsigned int max_level;
+  unsigned int ext_level;
+
+  /* See if we can use cpuid.  */
+  asm volatile ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
+		"pushl %0; popfl; pushfl; popl %0; popfl"
+		: "=&r" (eax), "=&r" (ebx)
+		: "i" (0x00200000));
+  if (((eax ^ ebx) & 0x00200000) == 0)
+    return "efiemu32.o";
+
+  /* Check the highest input value for eax.  */
+  cpuid (0, eax, ebx, ecx, edx);
+  /* We only look at the first four characters.  */
+  max_level = eax;
+  if (max_level == 0)
+    return "efiemu32.o";
+
+  cpuid (0x80000000, eax, ebx, ecx, edx);
+  ext_level = eax;
+  if (ext_level < 0x80000000)
+    return "efiemu32.o";
+
+  cpuid (0x80000001, eax, ebx, ecx, edx);
+  return (edx & bit_LM) ? "efiemu64.o" : "efiemu32.o";
+}