x86_common/Processor.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#ifndef KERNEL_PROCESSOR_X86_COMMON_PROCESSOR_H
#define KERNEL_PROCESSOR_X86_COMMON_PROCESSOR_H
#include "pedigree/kernel/processor/Processor.h"
 
#include <config.h>
 
class X86CommonProcessor : public ProcessorBase {
 public:
  static uint64_t readMachineSpecificRegister(uint32_t index);
  static void writeMachineSpecificRegister(uint32_t index, uint64_t value);
  static void cpuid(uint32_t inEax, uint32_t inEcx, uint32_t& eax, uint32_t& ebx, uint32_t& ecx,
                    uint32_t& edx);
 
  static physical_uintptr_t readCr3();
};
 
#if X86_COMMON && !X64
#if MULTIPROCESSOR
EXPORTED_PUBLIC NEVER_INLINE __attribute__((cold))
ProcessorInformation* currentProcessorInformationFromApic(
    const Vector<ProcessorInformation*>& processors, size_t* processorIndex = nullptr);
#endif
 
inline ProcessorInformation& ProcessorBase::information() {
#if MULTIPROCESSOR
  if (m_Initialised < 2)
    return m_SafeBspProcessorInformation;
 
  if (m_ProcessorInformation.count() == 1)
    return **m_ProcessorInformation.begin();
 
  if (auto* information = currentProcessorInformationFromApic(m_ProcessorInformation))
    return *information;
#endif
 
  return m_SafeBspProcessorInformation;
}
#endif
 
#endif