//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:  CPUID related functions                                              //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2019 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K 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, either version 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K 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.                              //
//                                                                            //
//  You should have received a copy of the GNU General Public License         //
//  along with OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#ifndef _KERNEL_H
#include <kernel.h>
#endif

#ifndef _KALKERN_CPUID_H
#define _KALKERN_CPUID_H

// -------------------------------------------------------------------------- //


// CPU features masks
enum {
    FEAT_ECX_SSE3         = 1 << 0,
    FEAT_ECX_PCLMUL       = 1 << 1,
    FEAT_ECX_DTES64       = 1 << 2,
    FEAT_ECX_MONITOR      = 1 << 3,
    FEAT_ECX_DS_CPL       = 1 << 4,
    FEAT_ECX_VMX          = 1 << 5,
    FEAT_ECX_SMX          = 1 << 6,
    FEAT_ECX_EST          = 1 << 7,
    FEAT_ECX_TM2          = 1 << 8,
    FEAT_ECX_SSSE3        = 1 << 9,
    FEAT_ECX_CID          = 1 << 10,
    FEAT_ECX_FMA          = 1 << 12,
    FEAT_ECX_CX16         = 1 << 13,
    FEAT_ECX_ETPRD        = 1 << 14,
    FEAT_ECX_PDCM         = 1 << 15,
    FEAT_ECX_PCIDE        = 1 << 17,
    FEAT_ECX_DCA          = 1 << 18,
    FEAT_ECX_SSE4_1       = 1 << 19,
    FEAT_ECX_SSE4_2       = 1 << 20,
    FEAT_ECX_x2APIC       = 1 << 21,
    FEAT_ECX_MOVBE        = 1 << 22,
    FEAT_ECX_POPCNT       = 1 << 23,
    FEAT_ECX_AES          = 1 << 25,
    FEAT_ECX_XSAVE        = 1 << 26,
    FEAT_ECX_OSXSAVE      = 1 << 27,
    FEAT_ECX_AVX          = 1 << 28,

    FEAT_EDX_FPU          = 1 << 0,
    FEAT_EDX_VME          = 1 << 1,
    FEAT_EDX_DE           = 1 << 2,
    FEAT_EDX_PSE          = 1 << 3,
    FEAT_EDX_TSC          = 1 << 4,
    FEAT_EDX_MSR          = 1 << 5,
    FEAT_EDX_PAE          = 1 << 6,
    FEAT_EDX_MCE          = 1 << 7,
    FEAT_EDX_CX8          = 1 << 8,
    FEAT_EDX_APIC         = 1 << 9,
    FEAT_EDX_SEP          = 1 << 11,
    FEAT_EDX_MTRR         = 1 << 12,
    FEAT_EDX_PGE          = 1 << 13,
    FEAT_EDX_MCA          = 1 << 14,
    FEAT_EDX_CMOV         = 1 << 15,
    FEAT_EDX_PAT          = 1 << 16,
    FEAT_EDX_PSE36        = 1 << 17,
    FEAT_EDX_PSN          = 1 << 18,
    FEAT_EDX_CLF          = 1 << 19,
    FEAT_EDX_DTES         = 1 << 21,
    FEAT_EDX_ACPI         = 1 << 22,
    FEAT_EDX_MMX          = 1 << 23,
    FEAT_EDX_FXSR         = 1 << 24,
    FEAT_EDX_SSE          = 1 << 25,
    FEAT_EDX_SSE2         = 1 << 26,
    FEAT_EDX_SS           = 1 << 27,
    FEAT_EDX_HTT          = 1 << 28,
    FEAT_EDX_TM1          = 1 << 29,
    FEAT_EDX_IA64         = 1 << 30,
    FEAT_EDX_PBE          = 1 << 31
};



// -------------------------------------------------------------------------- //

// Issue a single request to CPUID. Fits 'intel features', for instance
//  note that even if only "eax" and "edx" are of interest, other registers
//  will be modified by the operation, so we need to tell the compiler about it.
static inline void CpuCpuid(int code, uint *eax, uint *edx)
{
    asm volatile("cpuid":"=a"(*eax),"=d"(*edx):"a"(code):"ecx","ebx");
}

// Issue a complete request, storing general registers output as a string
static inline int CpuCpuidString(int code, uint where[4])
{
    asm volatile("cpuid":"=a"(*where),"=b"(*(where+1)),
               "=c"(*(where+3)),"=d"(*(where+2)):"a"(code));
    return (int)where[0];
}

// Read the TSC register
static inline ulong CpuRdtsc(void)
{
    uint lo, hi;
    asm volatile ("rdtsc" : "=a"(lo), "=d"(hi));
    return ( (ulong)lo)|( ((ulong)hi)<<32 );
}


void KeGetCpuInfos(void);
double KeGetCpuFrequency(void);
void KeActivateSSE(void);

// -------------------------------------------------------------------------- //

#endif