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