[cmdline] Add "cpuid" command
Allow x86 CPU feature flags (such as support for 64-bit mode) to be checked using the "cpuid" command. Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
parent
1050135159
commit
591541af66
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@ -1,73 +0,0 @@
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#include <stdint.h>
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#include <string.h>
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#include <cpu.h>
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/** @file
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*
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* CPU identification
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*
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*/
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/**
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* Test to see if CPU flag is changeable
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*
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* @v flag Flag to test
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* @ret can_change Flag is changeable
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*/
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static inline int flag_is_changeable ( unsigned int flag ) {
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uint32_t f1, f2;
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__asm__ ( "pushfl\n\t"
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"pushfl\n\t"
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"popl %0\n\t"
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"movl %0,%1\n\t"
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"xorl %2,%0\n\t"
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"pushl %0\n\t"
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"popfl\n\t"
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"pushfl\n\t"
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"popl %0\n\t"
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"popfl\n\t"
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: "=&r" ( f1 ), "=&r" ( f2 )
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: "ir" ( flag ) );
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return ( ( ( f1 ^ f2 ) & flag ) != 0 );
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}
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/**
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* Get CPU information
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*
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* @v cpu CPU information structure to fill in
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*/
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void get_cpuinfo ( struct cpuinfo_x86 *cpu ) {
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unsigned int cpuid_level;
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unsigned int cpuid_extlevel;
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unsigned int discard_1, discard_2, discard_3;
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memset ( cpu, 0, sizeof ( *cpu ) );
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/* Check for CPUID instruction */
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if ( ! flag_is_changeable ( X86_EFLAGS_ID ) ) {
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DBG ( "CPUID not supported\n" );
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return;
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}
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/* Get features, if present */
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cpuid ( 0x00000000, &cpuid_level, &discard_1,
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&discard_2, &discard_3 );
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if ( cpuid_level >= 0x00000001 ) {
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cpuid ( 0x00000001, &discard_1, &discard_2,
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&discard_3, &cpu->features );
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} else {
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DBG ( "CPUID cannot return capabilities\n" );
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}
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/* Get 64-bit features, if present */
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cpuid ( 0x80000000, &cpuid_extlevel, &discard_1,
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&discard_2, &discard_3 );
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if ( ( cpuid_extlevel & 0xffff0000 ) == 0x80000000 ) {
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if ( cpuid_extlevel >= 0x80000001 ) {
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cpuid ( 0x80000001, &discard_1, &discard_2,
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&discard_3, &cpu->amd_features );
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}
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}
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}
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@ -1,86 +0,0 @@
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#ifndef I386_BITS_CPU_H
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#define I386_BITS_CPU_H
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/* Intel-defined CPU features, CPUID level 0x00000001, word 0 */
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#define X86_FEATURE_FPU 0 /* Onboard FPU */
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#define X86_FEATURE_VME 1 /* Virtual Mode Extensions */
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#define X86_FEATURE_DE 2 /* Debugging Extensions */
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#define X86_FEATURE_PSE 3 /* Page Size Extensions */
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#define X86_FEATURE_TSC 4 /* Time Stamp Counter */
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#define X86_FEATURE_MSR 5 /* Model-Specific Registers, RDMSR, WRMSR */
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#define X86_FEATURE_PAE 6 /* Physical Address Extensions */
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#define X86_FEATURE_MCE 7 /* Machine Check Architecture */
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#define X86_FEATURE_CX8 8 /* CMPXCHG8 instruction */
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#define X86_FEATURE_APIC 9 /* Onboard APIC */
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#define X86_FEATURE_SEP 11 /* SYSENTER/SYSEXIT */
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#define X86_FEATURE_MTRR 12 /* Memory Type Range Registers */
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#define X86_FEATURE_PGE 13 /* Page Global Enable */
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#define X86_FEATURE_MCA 14 /* Machine Check Architecture */
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#define X86_FEATURE_CMOV 15 /* CMOV instruction (FCMOVCC and FCOMI too if FPU present) */
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#define X86_FEATURE_PAT 16 /* Page Attribute Table */
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#define X86_FEATURE_PSE36 17 /* 36-bit PSEs */
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#define X86_FEATURE_PN 18 /* Processor serial number */
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#define X86_FEATURE_CLFLSH 19 /* Supports the CLFLUSH instruction */
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#define X86_FEATURE_DTES 21 /* Debug Trace Store */
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#define X86_FEATURE_ACPI 22 /* ACPI via MSR */
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#define X86_FEATURE_MMX 23 /* Multimedia Extensions */
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#define X86_FEATURE_FXSR 24 /* FXSAVE and FXRSTOR instructions (fast save and restore */
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/* of FPU context), and CR4.OSFXSR available */
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#define X86_FEATURE_XMM 25 /* Streaming SIMD Extensions */
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#define X86_FEATURE_XMM2 26 /* Streaming SIMD Extensions-2 */
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#define X86_FEATURE_SELFSNOOP 27 /* CPU self snoop */
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#define X86_FEATURE_HT 28 /* Hyper-Threading */
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#define X86_FEATURE_ACC 29 /* Automatic clock control */
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#define X86_FEATURE_IA64 30 /* IA-64 processor */
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/* AMD-defined CPU features, CPUID level 0x80000001, word 1 */
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/* Don't duplicate feature flags which are redundant with Intel! */
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#define X86_FEATURE_SYSCALL 11 /* SYSCALL/SYSRET */
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#define X86_FEATURE_MMXEXT 22 /* AMD MMX extensions */
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#define X86_FEATURE_LM 29 /* Long Mode (x86-64) */
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#define X86_FEATURE_3DNOWEXT 30 /* AMD 3DNow! extensions */
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#define X86_FEATURE_3DNOW 31 /* 3DNow! */
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/** x86 CPU information */
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struct cpuinfo_x86 {
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/** CPU features */
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unsigned int features;
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/** 64-bit CPU features */
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unsigned int amd_features;
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};
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/*
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* EFLAGS bits
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*/
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#define X86_EFLAGS_CF 0x00000001 /* Carry Flag */
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#define X86_EFLAGS_PF 0x00000004 /* Parity Flag */
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#define X86_EFLAGS_AF 0x00000010 /* Auxillary carry Flag */
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#define X86_EFLAGS_ZF 0x00000040 /* Zero Flag */
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#define X86_EFLAGS_SF 0x00000080 /* Sign Flag */
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#define X86_EFLAGS_TF 0x00000100 /* Trap Flag */
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#define X86_EFLAGS_IF 0x00000200 /* Interrupt Flag */
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#define X86_EFLAGS_DF 0x00000400 /* Direction Flag */
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#define X86_EFLAGS_OF 0x00000800 /* Overflow Flag */
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#define X86_EFLAGS_IOPL 0x00003000 /* IOPL mask */
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#define X86_EFLAGS_NT 0x00004000 /* Nested Task */
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#define X86_EFLAGS_RF 0x00010000 /* Resume Flag */
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#define X86_EFLAGS_VM 0x00020000 /* Virtual Mode */
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#define X86_EFLAGS_AC 0x00040000 /* Alignment Check */
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#define X86_EFLAGS_VIF 0x00080000 /* Virtual Interrupt Flag */
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#define X86_EFLAGS_VIP 0x00100000 /* Virtual Interrupt Pending */
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#define X86_EFLAGS_ID 0x00200000 /* CPUID detection flag */
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/*
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* Generic CPUID function
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*/
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static inline __attribute__ (( always_inline )) void
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cpuid ( int op, unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx ) {
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__asm__ ( "cpuid" :
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"=a" ( *eax ), "=b" ( *ebx ), "=c" ( *ecx ), "=d" ( *edx )
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: "0" ( op ) );
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}
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extern void get_cpuinfo ( struct cpuinfo_x86 *cpu );
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#endif /* I386_BITS_CPU_H */
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@ -7,6 +7,7 @@ INCDIRS += arch/x86/include
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SRCDIRS += arch/x86/core
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SRCDIRS += arch/x86/interface/efi
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SRCDIRS += arch/x86/prefix
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SRCDIRS += arch/x86/hci/commands
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# breaks building some of the linux-related objects
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CFLAGS += -Ulinux
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@ -0,0 +1,154 @@
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/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <string.h>
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#include <ipxe/cpuid.h>
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/** @file
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*
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* x86 CPU feature detection
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*
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*/
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/**
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* Check whether or not CPUID instruction is supported
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*
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* @ret is_supported CPUID instruction is supported
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*/
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static int cpuid_is_supported ( void ) {
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unsigned long original;
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unsigned long inverted;
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__asm__ ( "pushf\n\t"
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"pushf\n\t"
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"pop %0\n\t"
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"mov %0,%1\n\t"
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"xor %2,%1\n\t"
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"push %1\n\t"
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"popf\n\t"
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"pushf\n\t"
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"pop %1\n\t"
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"popf\n\t"
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: "=&r" ( original ), "=&r" ( inverted )
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: "ir" ( CPUID_FLAG ) );
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return ( ( original ^ inverted ) & CPUID_FLAG );
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}
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/**
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* Issue CPUID instruction
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*
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* @v operation CPUID operation
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* @v eax Output via %eax
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* @v ebx Output via %ebx
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* @v ecx Output via %ecx
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* @v edx Output via %edx
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*/
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static inline __attribute__ (( always_inline )) void
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cpuid ( uint32_t operation, uint32_t *eax, uint32_t *ebx, uint32_t *ecx,
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uint32_t *edx ) {
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__asm__ ( "cpuid"
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: "=a" ( *eax ), "=b" ( *ebx ), "=c" ( *ecx ), "=d" ( *edx )
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: "0" ( operation ) );
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}
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/**
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* Get Intel-defined x86 CPU features
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*
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* @v features x86 CPU features to fill in
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*/
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static void x86_intel_features ( struct x86_features *features ) {
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uint32_t max_level;
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uint32_t discard_a;
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uint32_t discard_b;
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uint32_t discard_c;
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uint32_t discard_d;
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/* Check that features are available via CPUID */
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cpuid ( CPUID_VENDOR_ID, &max_level, &discard_b, &discard_c,
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&discard_d );
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if ( max_level < CPUID_FEATURES ) {
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DBGC ( features, "CPUID has no Intel-defined features (max "
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"level %08x)\n", max_level );
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return;
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}
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/* Get features */
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cpuid ( CPUID_FEATURES, &discard_a, &discard_b,
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&features->intel.ecx, &features->intel.edx );
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DBGC ( features, "CPUID Intel features: %%ecx=%08x, %%edx=%08x\n",
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features->intel.ecx, features->intel.edx );
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}
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/**
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* Get AMD-defined x86 CPU features
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*
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* @v features x86 CPU features to fill in
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*/
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static void x86_amd_features ( struct x86_features *features ) {
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uint32_t max_level;
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uint32_t discard_a;
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uint32_t discard_b;
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uint32_t discard_c;
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uint32_t discard_d;
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/* Check that features are available via CPUID */
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cpuid ( CPUID_AMD_MAX_FN, &max_level, &discard_b, &discard_c,
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&discard_d );
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if ( ( max_level & CPUID_AMD_CHECK_MASK ) != CPUID_AMD_CHECK ) {
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DBGC ( features, "CPUID has no extended functions\n" );
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return;
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}
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if ( max_level < CPUID_AMD_FEATURES ) {
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DBGC ( features, "CPUID has no AMD-defined features (max "
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"level %08x)\n", max_level );
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return;
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}
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/* Get features */
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cpuid ( CPUID_AMD_FEATURES, &discard_a, &discard_b,
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&features->amd.ecx, &features->amd.edx );
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DBGC ( features, "CPUID AMD features: %%ecx=%08x, %%edx=%08x\n",
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features->amd.ecx, features->amd.edx );
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}
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/**
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* Get x86 CPU features
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*
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* @v features x86 CPU features to fill in
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*/
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void x86_features ( struct x86_features *features ) {
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/* Clear all features */
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memset ( features, 0, sizeof ( *features ) );
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/* Check that CPUID instruction is available */
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if ( ! cpuid_is_supported() ) {
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DBGC ( features, "CPUID instruction is not supported\n" );
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return;
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}
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/* Get Intel-defined features */
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x86_intel_features ( features );
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/* Get AMD-defined features */
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x86_amd_features ( features );
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}
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@ -0,0 +1,94 @@
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/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
|
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* along with this program; if not, write to the Free Software
|
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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#include <stdio.h>
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#include <errno.h>
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#include <getopt.h>
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#include <ipxe/cpuid.h>
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#include <ipxe/command.h>
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#include <ipxe/parseopt.h>
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/** @file
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*
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* x86 CPU feature detection command
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*
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*/
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/** "cpuid" options */
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struct cpuid_options {
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/** Check AMD-defined features (%eax=0x80000001) */
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int amd;
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/** Check features defined via %ecx */
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int ecx;
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};
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/** "cpuid" option list */
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static struct option_descriptor cpuid_opts[] = {
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OPTION_DESC ( "amd", 'a', no_argument,
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struct cpuid_options, amd, parse_flag ),
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OPTION_DESC ( "ecx", 'c', no_argument,
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struct cpuid_options, ecx, parse_flag ),
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};
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/** "cpuid" command descriptor */
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static struct command_descriptor cpuid_cmd =
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COMMAND_DESC ( struct cpuid_options, cpuid_opts, 1, 1,
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"[--amd] [--ecx] <bit>" );
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/**
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* The "cpuid" command
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*
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* @v argc Argument count
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* @v argv Argument list
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* @ret rc Return status code
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*/
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static int cpuid_exec ( int argc, char **argv ) {
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struct cpuid_options opts;
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struct x86_features features;
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struct x86_feature_registers *feature_regs;
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uint32_t feature_reg;
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unsigned int bit;
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int rc;
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/* Parse options */
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if ( ( rc = parse_options ( argc, argv, &cpuid_cmd, &opts ) ) != 0 )
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return rc;
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/* Parse bit number */
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if ( ( rc = parse_integer ( argv[optind], &bit ) ) != 0 )
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return rc;
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/* Get CPU features */
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x86_features ( &features );
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/* Extract relevant feature register */
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feature_regs = ( opts.amd ? &features.amd : &features.intel );
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feature_reg = ( opts.ecx ? feature_regs->ecx : feature_regs->edx );
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/* Check presence of specified feature */
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return ( ( feature_reg & ( 1 << bit ) ) ? 0 : -ENOENT );
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}
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/** x86 CPU feature detection command */
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struct command cpuid_command __command = {
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.name = "cpuid",
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.exec = cpuid_exec,
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};
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@ -38,8 +38,10 @@ FILE_LICENCE ( GPL2_OR_LATER );
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#define ERRFILE_undionly ( ERRFILE_ARCH | ERRFILE_NET | 0x00030000 )
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#define ERRFILE_undirom ( ERRFILE_ARCH | ERRFILE_NET | 0x00040000 )
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#define ERRFILE_timer_rdtsc ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00000000 )
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#define ERRFILE_timer_bios ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00010000 )
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#define ERRFILE_timer_rdtsc ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00000000 )
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#define ERRFILE_timer_bios ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00010000 )
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#define ERRFILE_cpuid_cmd ( ERRFILE_ARCH | ERRFILE_OTHER | 0x00000000 )
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/** @} */
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@ -0,0 +1,53 @@
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#ifndef _IPXE_CPUID_H
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#define _IPXE_CPUID_H
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/** @file
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*
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* x86 CPU feature detection
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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/** An x86 CPU feature register set */
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struct x86_feature_registers {
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/** Features returned via %ecx */
|
||||
uint32_t ecx;
|
||||
/** Features returned via %edx */
|
||||
uint32_t edx;
|
||||
};
|
||||
|
||||
/** x86 CPU features */
|
||||
struct x86_features {
|
||||
/** Intel-defined features (%eax=0x00000001) */
|
||||
struct x86_feature_registers intel;
|
||||
/** AMD-defined features (%eax=0x80000001) */
|
||||
struct x86_feature_registers amd;
|
||||
};
|
||||
|
||||
/** CPUID support flag */
|
||||
#define CPUID_FLAG 0x00200000UL
|
||||
|
||||
/** Get vendor ID and largest standard function */
|
||||
#define CPUID_VENDOR_ID 0x00000000UL
|
||||
|
||||
/** Get standard features */
|
||||
#define CPUID_FEATURES 0x00000001UL
|
||||
|
||||
/** Get largest extended function */
|
||||
#define CPUID_AMD_MAX_FN 0x80000000UL
|
||||
|
||||
/** Extended function existence check */
|
||||
#define CPUID_AMD_CHECK 0x80000000UL
|
||||
|
||||
/** Extended function existence check mask */
|
||||
#define CPUID_AMD_CHECK_MASK 0xffff0000UL
|
||||
|
||||
/** Get extended features */
|
||||
#define CPUID_AMD_FEATURES 0x80000001UL
|
||||
|
||||
extern void x86_features ( struct x86_features *features );
|
||||
|
||||
#endif /* _IPXE_CPUID_H */
|
||||
|
|
@ -238,6 +238,9 @@ REQUIRE_OBJECT ( vlan_cmd );
|
|||
#ifdef REBOOT_CMD
|
||||
REQUIRE_OBJECT ( reboot_cmd );
|
||||
#endif
|
||||
#ifdef CPUID_CMD
|
||||
REQUIRE_OBJECT ( cpuid_cmd );
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Drag in miscellaneous objects
|
||||
|
|
|
|||
|
|
@ -36,5 +36,6 @@ FILE_LICENCE ( GPL2_OR_LATER );
|
|||
#define SANBOOT_PROTO_FCP /* Fibre Channel protocol */
|
||||
|
||||
#define REBOOT_CMD /* Reboot command */
|
||||
#define CPUID_CMD /* x86 CPU feature detection command */
|
||||
|
||||
#endif /* CONFIG_DEFAULTS_PCBIOS_H */
|
||||
|
|
|
|||
Reference in New Issue