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1 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ia32
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 * @{
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 */
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/** @file
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 */
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#include <arch/cpu.h>
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#include <arch/cpuid.h>
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#include <arch/pm.h>
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#include <arch.h>
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#include <arch/types.h>
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#include <print.h>
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#include <fpu_context.h>
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#include <arch/smp/apic.h>
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#include <arch/syscall.h>
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/*
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 * Identification of CPUs.
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 * Contains only non-MP-Specification specific SMP code.
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 */
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#define AMD_CPUID_EBX   0x68747541
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#define AMD_CPUID_ECX   0x444d4163
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#define AMD_CPUID_EDX   0x69746e65
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#define INTEL_CPUID_EBX 0x756e6547
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#define INTEL_CPUID_ECX 0x6c65746e
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#define INTEL_CPUID_EDX 0x49656e69
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enum vendor {
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    VendorUnknown=0,
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    VendorAMD,
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    VendorIntel
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};
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static char *vendor_str[] = {
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    "Unknown Vendor",
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    "AMD",
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    "Intel"
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};
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void fpu_disable(void)
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{
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    asm volatile (
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        "mov %%cr0,%%eax;"
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        "or $8,%%eax;"
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        "mov %%eax,%%cr0;"
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        :
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        :
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        : "%eax"
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    );
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}
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309 palkovsky 84 
void fpu_enable(void)
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{
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    asm volatile (
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        "mov %%cr0,%%eax;"
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        "and $0xffFFffF7,%%eax;"
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        "mov %%eax,%%cr0;"
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        :
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        :
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        : "%eax"
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    ); 
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}
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void cpu_arch_init(void)
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{
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    cpuid_feature_info fi;
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    cpuid_extended_feature_info efi;
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    cpu_info_t info;
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    uint32_t help = 0;
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    CPU->arch.tss = tss_p;
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    CPU->arch.tss->iomap_base = &CPU->arch.tss->iomap[0] - ((uint8_t *) CPU->arch.tss);
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    CPU->fpu_owner = NULL;
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    cpuid(1, &info);
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    fi.word = info.cpuid_edx;
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    efi.word = info.cpuid_ecx;
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    if (fi.bits.fxsr)
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        fpu_fxsr();
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    else
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        fpu_fsr(); 
1019 vana 117 
 
1187 jermar 118 
    if (fi.bits.sse) {
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        asm volatile (
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            "mov %%cr4,%0\n"
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            "or %1,%0\n"
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            "mov %0,%%cr4\n"
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            : "+r" (help)
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            : "i" (CR4_OSFXSR_MASK|(1<<10))
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        );
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    }
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    /* Setup fast SYSENTER/SYSEXIT syscalls */
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    syscall_setup_cpu();
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}
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void cpu_identify(void)
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{
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    cpu_info_t info;
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    CPU->arch.vendor = VendorUnknown;
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    if (has_cpuid()) {
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        cpuid(0, &info);
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        /*
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         * Check for AMD processor.
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         */
3707 decky 143 
        if ((info.cpuid_ebx == AMD_CPUID_EBX)
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            && (info.cpuid_ecx == AMD_CPUID_ECX)
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            && (info.cpuid_edx == AMD_CPUID_EDX))
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            CPU->arch.vendor = VendorAMD;
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        /*
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         * Check for Intel processor.
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         */    
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        if ((info.cpuid_ebx == INTEL_CPUID_EBX)
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            && (info.cpuid_ecx == INTEL_CPUID_ECX)
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            && (info.cpuid_edx == INTEL_CPUID_EDX))
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            CPU->arch.vendor = VendorIntel;
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1 jermar 156 
        cpuid(1, &info);
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        CPU->arch.family = (info.cpuid_eax >> 8) & 0x0f;
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        CPU->arch.model = (info.cpuid_eax >> 4) & 0x0f;
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        CPU->arch.stepping = (info.cpuid_eax >> 0) & 0x0f;                     
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    }
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}
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3707 decky 163 
void cpu_print_report(cpu_t* cpu)
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{
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    printf("cpu%u: (%s family=%u model=%u stepping=%u) %" PRIu16 " MHz\n",
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        cpu->id, vendor_str[cpu->arch.vendor], cpu->arch.family,
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        cpu->arch.model, cpu->arch.stepping, cpu->frequency_mhz);
1 jermar 168 
}
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1731 jermar 170 
/** @}
1702 cejka 171 
 */