arm_common/ProcessorInformation.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_ARM_COMMON_PROCESSORINFORMATION_H
#define KERNEL_PROCESSOR_ARM_COMMON_PROCESSORINFORMATION_H

#include "pedigree/kernel/process/PerProcessorScheduler.h"
#include "pedigree/kernel/process/Thread.h"
#include "pedigree/kernel/processor/VirtualAddressSpace.h"
#include "pedigree/kernel/processor/types.h"

class ArmCommonProcessorInformation
{
    friend class Processor;
    // friend class Multiprocessor;
  public:
    inline VirtualAddressSpace &getVirtualAddressSpace() const
    {
        if (m_VirtualAddressSpace)
            return *m_VirtualAddressSpace;
        else
            return VirtualAddressSpace::getKernelAddressSpace();
    }
    inline void setVirtualAddressSpace(VirtualAddressSpace &virtualAddressSpace)
    {
        m_VirtualAddressSpace = &virtualAddressSpace;
    }

    inline uintptr_t getKernelStack() const;
    inline void setKernelStack(uintptr_t stack);
#ifdef THREADS
    inline Thread *getCurrentThread() const
    {
        return m_pCurrentThread;
    }
    inline void setCurrentThread(Thread *pThread)
    {
        m_pCurrentThread = pThread;
    }

    inline PerProcessorScheduler &getScheduler()
    {
        return m_Scheduler;
    }
#endif

  protected:
    inline ArmCommonProcessorInformation(
        ProcessorId processorId, uint8_t apicId = 0)
        : m_ProcessorId(processorId),
          m_VirtualAddressSpace(&VirtualAddressSpace::getKernelAddressSpace())
#ifdef THREADS
          ,
          m_pCurrentThread(0), m_Scheduler()
#endif
    {
    }
    inline virtual ~ArmCommonProcessorInformation()
    {
    }

  private:
    ArmCommonProcessorInformation();
    ArmCommonProcessorInformation(const ArmCommonProcessorInformation &);
    ArmCommonProcessorInformation &
    operator=(const ArmCommonProcessorInformation &);

    ProcessorId m_ProcessorId;
    VirtualAddressSpace *m_VirtualAddressSpace;
#ifdef THREADS

    Thread *m_pCurrentThread;
    PerProcessorScheduler m_Scheduler;
#endif
};

//
// Part of the implementation
//
uintptr_t ArmCommonProcessorInformation::getKernelStack() const
{
    return 0;
    /*
        uintptr_t ret = 0;

        // Switch to IRQ mode
        uint32_t cpsr = 0;
        asm volatile("mrs %0, cpsr" : "=r" (cpsr));
        uint32_t oldMode = cpsr & 0x3F;
        if(oldMode != 0x12)
        {
            cpsr &= ~0x3F;
            cpsr |= 0x12;
            asm volatile("msr cpsr_c, %0" : : "r" (cpsr));
        }

        // Load new stack and all that
        asm volatile("mov %0, sp" : "=r" (ret));

        // Switch back to the previous mode
        if(oldMode != 0x12)
        {
            cpsr &= ~0x3F;
            cpsr |= oldMode;
            asm volatile("msr cpsr_c, %0" : : "r" (cpsr));
        }

        return ret;
    */
}
void ArmCommonProcessorInformation::setKernelStack(uintptr_t stack)
{
    /*
        // Handle IRQ save location
        stack -= 0x10;

        // Switch to IRQ mode
        uint32_t cpsr = 0;
        asm volatile("mrs %0, cpsr" : "=r" (cpsr));
        uint32_t oldMode = cpsr & 0x3F;
        if(oldMode == 0x12)
        {
            // Can't switch a stack we're using!
            return;
        }
        cpsr &= ~0x3F;
        cpsr |= 0x12;
        asm volatile("msr cpsr_c, %0" : : "r" (cpsr));

        // Load new stack and all that
        asm volatile("mov sp, %0; mov r13, %1" : : "r" (stack), "r" (stack +
       0x10) : "sp", "r13");

        // Switch back to the previous mode
        cpsr &= ~0x3F;
        cpsr |= oldMode;
        asm volatile("msr cpsr_c, %0" : : "r" (cpsr));
    */
}

#endif