armv7/state.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_ARMV7_STATE_H
#define KERNEL_PROCESSOR_ARMV7_STATE_H

#include "pedigree/kernel/compiler.h"
#include "pedigree/kernel/processor/types.h"

class ARMV7InterruptState
{
  public:
    //
    // General Interface (both InterruptState and SyscallState)
    //
    inline uintptr_t getStackPointer() const;
    inline void setStackPointer(uintptr_t stackPointer);
    inline uintptr_t getInstructionPointer() const;
    inline void setInstructionPointer(uintptr_t instructionPointer);
    inline uintptr_t getBasePointer() const;
    inline void setBasePointer(uintptr_t basePointer);
    size_t getRegisterCount() const;
    processor_register_t getRegister(size_t index) const;
    const char *getRegisterName(size_t index) const;
    inline size_t getRegisterSize(size_t index) const;

    //
    // InterruptState Interface
    //
    inline bool kernelMode() const;
    inline size_t getInterruptNumber() const;

    //
    // SyscallState Interface
    //
    inline size_t getSyscallService() const;
    inline size_t getSyscallNumber() const;
    inline uintptr_t getSyscallParameter(size_t n) const;
    inline void setSyscallReturnValue(uintptr_t val);

  private:
  public:
    ARMV7InterruptState();

    ARMV7InterruptState(const ARMV7InterruptState &);
    ARMV7InterruptState &operator=(const ARMV7InterruptState &);
    ~ARMV7InterruptState()
    {
    }

    uint32_t m_usersp;
    uint32_t m_userlr;
    uint32_t m_r0;
    uint32_t m_r1;
    uint32_t m_r2;
    uint32_t m_r3;
    uint32_t m_r4;
    uint32_t m_r5;
    uint32_t m_r6;
    uint32_t m_r7;
    uint32_t m_r8;
    uint32_t m_r9;
    uint32_t m_r10;
    uint32_t m_r11;
    uint32_t m_r12;
    uint32_t m_lr;
    uint32_t m_pc;
    uint32_t m_spsr;
} PACKED;

typedef ARMV7InterruptState ARMV7SyscallState;
typedef ARMV7InterruptState ARMV7ProcessorState;

class __attribute__((aligned(8))) ARMV7SchedulerState
{
  public:
    uint32_t r4;
    uint32_t r5;
    uint32_t r6;
    uint32_t r7;
    uint32_t r8;
    uint32_t r9;
    uint32_t r10;
    uint32_t r11;
    uint32_t r12;
    uint32_t sp;
    uint32_t lr;
} __attribute__((aligned(8)));

//
// Part of the Implementation
//

uintptr_t ARMV7InterruptState::getStackPointer() const
{
    return m_usersp;
}
void ARMV7InterruptState::setStackPointer(uintptr_t stackPointer)
{
    m_usersp = stackPointer;
}
uintptr_t ARMV7InterruptState::getInstructionPointer() const
{
    return m_pc;
}
void ARMV7InterruptState::setInstructionPointer(uintptr_t instructionPointer)
{
    m_pc = instructionPointer;
}
uintptr_t ARMV7InterruptState::getBasePointer() const
{
    return m_r11;
}
void ARMV7InterruptState::setBasePointer(uintptr_t basePointer)
{
    m_r11 = basePointer;
}
size_t ARMV7InterruptState::getRegisterSize(size_t index) const
{
#if defined(BITS_32)
    return 4;
#else
    return 4;  // TODO: handle other bits sizes (this is mainly here)
               // in order to help future development if ARM ends up
               // requiring 64-bit or something
#endif
}

bool ARMV7InterruptState::kernelMode() const
{
    uint32_t cpsr;
    asm volatile("mrs %0, cpsr" : "=r"(cpsr));
    return ((cpsr & 0x1F) != 0x10);
}
size_t ARMV7InterruptState::getInterruptNumber() const
{
    return 0;
}

size_t ARMV7InterruptState::getSyscallService() const
{
    return 0;
}
size_t ARMV7InterruptState::getSyscallNumber() const
{
    return 0;
}
uintptr_t ARMV7InterruptState::getSyscallParameter(size_t n) const
{
    return 0;
}
void ARMV7InterruptState::setSyscallReturnValue(uintptr_t val)
{
}

#endif