HelenOS sources
This source file includes following definitions.
- fpu_disable
- fpu_enable
- cpu_arch_init
- cpu_identify
- cpu_print_report
#include <arch/cpu.h>
#include <arch/cpuid.h>
#include <arch/pm.h>
#include <arch.h>
#include <stdint.h>
#include <stdio.h>
#include <fpu_context.h>
#include <arch/smp/apic.h>
#include <arch/syscall.h>
#define AMD_CPUID_EBX UINT32_C(0x68747541)
#define AMD_CPUID_ECX UINT32_C(0x444d4163)
#define AMD_CPUID_EDX UINT32_C(0x69746e65)
#define INTEL_CPUID_EBX UINT32_C(0x756e6547)
#define INTEL_CPUID_ECX UINT32_C(0x6c65746e)
#define INTEL_CPUID_EDX UINT32_C(0x49656e69)
enum vendor {
VendorUnknown = 0,
VendorAMD,
VendorIntel
};
static const char *vendor_str[] = {
"Unknown Vendor",
"AMD",
"Intel"
};
void fpu_disable(void)
{
write_cr0(read_cr0() | CR0_TS);
}
void fpu_enable(void)
{
write_cr0(read_cr0() & ~CR0_TS);
}
void cpu_arch_init(void)
{
cpu_info_t info;
uint32_t help = 0;
CPU->arch.tss = tss_p;
CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] - ((uint8_t *) CPU->arch.tss);
cpuid(INTEL_CPUID_STANDARD, &info);
CPU->arch.fi.word = info.cpuid_edx;
if (CPU->arch.fi.bits.fxsr)
fpu_fxsr();
else
fpu_fsr();
if (CPU->arch.fi.bits.sse) {
asm volatile (
"mov %%cr4, %[help]\n"
"or %[mask], %[help]\n"
"mov %[help], %%cr4\n"
: [help] "+r" (help)
: [mask] "i" (CR4_OSFXSR | CR4_OSXMMEXCPT)
);
}
#ifndef PROCESSOR_i486
if (CPU->arch.fi.bits.sep) {
syscall_setup_cpu();
}
#endif
}
void cpu_identify(void)
{
cpu_info_t info;
CPU->arch.vendor = VendorUnknown;
if (has_cpuid()) {
cpuid(INTEL_CPUID_LEVEL, &info);
if ((info.cpuid_ebx == AMD_CPUID_EBX) &&
(info.cpuid_ecx == AMD_CPUID_ECX) &&
(info.cpuid_edx == AMD_CPUID_EDX))
CPU->arch.vendor = VendorAMD;
if ((info.cpuid_ebx == INTEL_CPUID_EBX) &&
(info.cpuid_ecx == INTEL_CPUID_ECX) &&
(info.cpuid_edx == INTEL_CPUID_EDX))
CPU->arch.vendor = VendorIntel;
cpuid(INTEL_CPUID_STANDARD, &info);
CPU->arch.family = (info.cpuid_eax >> 8) & 0x0fU;
CPU->arch.model = (info.cpuid_eax >> 4) & 0x0fU;
CPU->arch.stepping = (info.cpuid_eax >> 0) & 0x0fU;
}
}
void cpu_print_report(cpu_t *cpu)
{
printf("cpu%u: (%s family=%u model=%u stepping=%u apicid=%u) %" PRIu16
" MHz\n", cpu->id, vendor_str[cpu->arch.vendor], cpu->arch.family,
cpu->arch.model, cpu->arch.stepping, cpu->arch.id, cpu->frequency_mhz);
}
HelenOS homepage, sources at GitHub