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/*

 * Copyright (c) 2001-2004 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup ia32

 * @{

 */

/** @file

 */

#include <arch/cpu.h>

#include <arch/cpuid.h>

#include <arch/pm.h>

#include <arch.h>

#include <arch/types.h>

#include <print.h>

#include <fpu_context.h>

#include <arch/smp/apic.h>

#include <arch/syscall.h>

/*

 * Identification of CPUs.

 * Contains only non-MP-Specification specific SMP code.

 */

#define AMD_CPUID_EBX  0x68747541

#define AMD_CPUID_ECX  0x444d4163

#define AMD_CPUID_EDX  0x69746e65

#define INTEL_CPUID_EBX  0x756e6547

#define INTEL_CPUID_ECX  0x6c65746e

#define INTEL_CPUID_EDX  0x49656e69

enum vendor {

    VendorUnknown = 0,

    VendorAMD,

    VendorIntel

};

static char *vendor_str[] = {

    "Unknown Vendor",

    "AMD",

    "Intel"

};

void fpu_disable(void)

{

    asm volatile (

        "mov %%cr0, %%eax\n"

        "or $8, %%eax\n"

        "mov %%eax, %%cr0\n"

        ::: "%eax"

    );

}

void fpu_enable(void)

{

    asm volatile (

        "mov %%cr0, %%eax\n"

        "and $0xffFFffF7, %%eax\n"

        "mov %%eax,%%cr0\n"

        ::: "%eax"

    );

}

void cpu_arch_init(void)

{

    cpuid_feature_info fi;

    cpuid_extended_feature_info efi;

    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);

    CPU->fpu_owner = NULL;

    cpuid(1, &info);

    fi.word = info.cpuid_edx;

    efi.word = info.cpuid_ecx;

    if (fi.bits.fxsr)

        fpu_fxsr();

    else

        fpu_fsr();

    if (fi.bits.sse) {

        asm volatile (

            "mov %%cr4, %[help]\n"

            "or %[mask], %[help]\n"

            "mov %[help], %%cr4\n"

            : [help] "+r" (help)

            : [mask] "i" (CR4_OSFXSR_MASK | (1 << 10))

        );

    }

    /* Setup fast SYSENTER/SYSEXIT syscalls */

    syscall_setup_cpu();

}

void cpu_identify(void)

{

    cpu_info_t info;

    CPU->arch.vendor = VendorUnknown;

    if (has_cpuid()) {

        cpuid(0, &info);

        /*

         * Check for AMD processor.

         */

        if ((info.cpuid_ebx == AMD_CPUID_EBX)

            && (info.cpuid_ecx == AMD_CPUID_ECX)

            && (info.cpuid_edx == AMD_CPUID_EDX))

            CPU->arch.vendor = VendorAMD;

        /*

         * Check for Intel processor.

         */    

        if ((info.cpuid_ebx == INTEL_CPUID_EBX)

            && (info.cpuid_ecx == INTEL_CPUID_ECX)

            && (info.cpuid_edx == INTEL_CPUID_EDX))

            CPU->arch.vendor = VendorIntel;

        cpuid(1, &info);

        CPU->arch.family = (info.cpuid_eax >> 8) & 0x0f;

        CPU->arch.model = (info.cpuid_eax >> 4) & 0x0f;

        CPU->arch.stepping = (info.cpuid_eax >> 0) & 0x0f;                     

    }

}

void cpu_print_report(cpu_t* cpu)

{

    printf("cpu%u: (%s family=%u model=%u stepping=%u) %" PRIu16 " MHz\n",

        cpu->id, vendor_str[cpu->arch.vendor], cpu->arch.family,

        cpu->arch.model, cpu->arch.stepping, cpu->frequency_mhz);

}

/** @}

 */