53b08c347f
This patch introduces 3 helper function for cpuid(1) : 1. cpu_get_cpuid() -> to get processor id (from cpuid.eax) 2. cpu_get_feature_flags_ecx -> to get processor feature flag (from cpuid.ecx) 3. cpu_get_feature_flags_edx -> to get processor feature flag (from cpuid.edx) Above 3 helper functions are targeted to replace majority of cpuid(1) references. Change-Id: Ib96a7c79dadb1feff0b8d58aa408b355fbb3bc50 Signed-off-by: Subrata Banik <subrata.banik@intel.com> Reviewed-on: https://review.coreboot.org/c/30123 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
/*
|
|
* This file is part of the coreboot project.
|
|
*
|
|
* 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; version 2 of the License.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <cpu/cpu.h>
|
|
|
|
#ifndef __x86_64__
|
|
/* Standard macro to see if a specific flag is changeable */
|
|
static inline int flag_is_changeable_p(uint32_t flag)
|
|
{
|
|
uint32_t f1, f2;
|
|
|
|
asm(
|
|
"pushfl\n\t"
|
|
"pushfl\n\t"
|
|
"popl %0\n\t"
|
|
"movl %0,%1\n\t"
|
|
"xorl %2,%0\n\t"
|
|
"pushl %0\n\t"
|
|
"popfl\n\t"
|
|
"pushfl\n\t"
|
|
"popl %0\n\t"
|
|
"popfl\n\t"
|
|
: "=&r" (f1), "=&r" (f2)
|
|
: "ir" (flag));
|
|
return ((f1^f2) & flag) != 0;
|
|
}
|
|
|
|
/* Probe for the CPUID instruction */
|
|
int cpu_have_cpuid(void)
|
|
{
|
|
return flag_is_changeable_p(X86_EFLAGS_ID);
|
|
}
|
|
|
|
#else
|
|
|
|
int cpu_have_cpuid(void)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
int cpu_cpuid_extended_level(void)
|
|
{
|
|
return cpuid_eax(0x80000000);
|
|
}
|
|
|
|
int cpu_phys_address_size(void)
|
|
{
|
|
if (!(cpu_have_cpuid()))
|
|
return 32;
|
|
|
|
if (cpu_cpuid_extended_level() >= 0x80000008)
|
|
return cpuid_eax(0x80000008) & 0xff;
|
|
|
|
if (cpuid_edx(1) & (CPUID_FEATURE_PAE | CPUID_FEATURE_PSE36))
|
|
return 36;
|
|
return 32;
|
|
}
|
|
|
|
/*
|
|
* Get processor id using cpuid eax=1
|
|
* return value in EAX register
|
|
*/
|
|
uint32_t cpu_get_cpuid(void)
|
|
{
|
|
return cpuid_eax(1);
|
|
}
|
|
|
|
/*
|
|
* Get processor feature flag using cpuid eax=1
|
|
* return value in ECX register
|
|
*/
|
|
uint32_t cpu_get_feature_flags_ecx(void)
|
|
{
|
|
return cpuid_ecx(1);
|
|
}
|
|
|
|
/*
|
|
* Get processor feature flag using cpuid eax=1
|
|
* return value in EDX register
|
|
*/
|
|
uint32_t cpu_get_feature_flags_edx(void)
|
|
{
|
|
return cpuid_edx(1);
|
|
}
|