diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/x86/core/cpuid.c')
-rw-r--r-- | qemu/roms/ipxe/src/arch/x86/core/cpuid.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/qemu/roms/ipxe/src/arch/x86/core/cpuid.c b/qemu/roms/ipxe/src/arch/x86/core/cpuid.c deleted file mode 100644 index bc5a6c68c..000000000 --- a/qemu/roms/ipxe/src/arch/x86/core/cpuid.c +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>. - * - * This program 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 2 of the - * License, or any later version. - * - * This program 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 this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -#include <string.h> -#include <ipxe/cpuid.h> - -/** @file - * - * x86 CPU feature detection - * - */ - -/** - * Check whether or not CPUID instruction is supported - * - * @ret is_supported CPUID instruction is supported - */ -int cpuid_is_supported ( void ) { - unsigned long original; - unsigned long inverted; - - __asm__ ( "pushf\n\t" - "pushf\n\t" - "pop %0\n\t" - "mov %0,%1\n\t" - "xor %2,%1\n\t" - "push %1\n\t" - "popf\n\t" - "pushf\n\t" - "pop %1\n\t" - "popf\n\t" - : "=&r" ( original ), "=&r" ( inverted ) - : "ir" ( CPUID_FLAG ) ); - return ( ( original ^ inverted ) & CPUID_FLAG ); -} - -/** - * Get Intel-defined x86 CPU features - * - * @v features x86 CPU features to fill in - */ -static void x86_intel_features ( struct x86_features *features ) { - uint32_t max_level; - uint32_t discard_a; - uint32_t discard_b; - uint32_t discard_c; - uint32_t discard_d; - - /* Check that features are available via CPUID */ - cpuid ( CPUID_VENDOR_ID, &max_level, &discard_b, &discard_c, - &discard_d ); - if ( max_level < CPUID_FEATURES ) { - DBGC ( features, "CPUID has no Intel-defined features (max " - "level %08x)\n", max_level ); - return; - } - - /* Get features */ - cpuid ( CPUID_FEATURES, &discard_a, &discard_b, - &features->intel.ecx, &features->intel.edx ); - DBGC ( features, "CPUID Intel features: %%ecx=%08x, %%edx=%08x\n", - features->intel.ecx, features->intel.edx ); - -} - -/** - * Get AMD-defined x86 CPU features - * - * @v features x86 CPU features to fill in - */ -static void x86_amd_features ( struct x86_features *features ) { - uint32_t max_level; - uint32_t discard_a; - uint32_t discard_b; - uint32_t discard_c; - uint32_t discard_d; - - /* Check that features are available via CPUID */ - cpuid ( CPUID_AMD_MAX_FN, &max_level, &discard_b, &discard_c, - &discard_d ); - if ( ( max_level & CPUID_AMD_CHECK_MASK ) != CPUID_AMD_CHECK ) { - DBGC ( features, "CPUID has no extended functions\n" ); - return; - } - if ( max_level < CPUID_AMD_FEATURES ) { - DBGC ( features, "CPUID has no AMD-defined features (max " - "level %08x)\n", max_level ); - return; - } - - /* Get features */ - cpuid ( CPUID_AMD_FEATURES, &discard_a, &discard_b, - &features->amd.ecx, &features->amd.edx ); - DBGC ( features, "CPUID AMD features: %%ecx=%08x, %%edx=%08x\n", - features->amd.ecx, features->amd.edx ); -} - -/** - * Get x86 CPU features - * - * @v features x86 CPU features to fill in - */ -void x86_features ( struct x86_features *features ) { - - /* Clear all features */ - memset ( features, 0, sizeof ( *features ) ); - - /* Check that CPUID instruction is available */ - if ( ! cpuid_is_supported() ) { - DBGC ( features, "CPUID instruction is not supported\n" ); - return; - } - - /* Get Intel-defined features */ - x86_intel_features ( features ); - - /* Get AMD-defined features */ - x86_amd_features ( features ); -} |