control_register.h

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// Copyright (c) 2014, 임경현 (dlarudgus20)
// 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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.

#ifndef CONTROL_REGISTER_H_
#define CONTROL_REGISTER_H_

enum tagCr0Flags
{
    CR0_MONITOR_COPROC  = 1 << 1,
    CR0_FPU_EMULATION   = 1 << 2,
    CR0_TASK_SWITCHED   = 1 << 3,
    CR0_WRITE_BACK      = 1 << 29,
    CR0_DISABLE_CACHE   = 1 << 30,
    CR0_PAGING          = 1 << 31,
};

enum tagCr3Flags
{
    CR4_OSFXSR          = 1 << 9,
    CR4_OSXMMEXCPT      = 1 << 10,
};

// Special Functions

static inline void ckAsmClearTS(void)
{
    __asm__ __volatile__ ( "clts" );
}

// Get/Set

static inline uint32_t ckAsmGetCr0(void)
{
    uint32_t ret;
    __asm__ __volatile__ ( "mov %%cr0, %0" : "=r"(ret) );
    return ret;
}
static inline void ckAsmSetCr0(uint32_t value)
{
    __asm__ __volatile__ ( "mov %0, %%cr0" : : "r"(value) );
}

static inline uint32_t ckAsmGetCr3(void)
{
    uint32_t ret;
    __asm__ __volatile__ ( "mov %%cr3, %0 " : "=r"(ret) );
    return ret;
}
static inline void ckAsmSetCr3(uint32_t value)
{
    // 페이징이 바뀌기 때문에 memory를 clobber함
    __asm__ __volatile__ ( "mov %0, %%cr3" : : "r"(value) : "memory" );
}

static inline uint32_t ckAsmGetCr4(void)
{
    uint32_t ret;
    __asm__ __volatile__ ( "mov %%cr4, %0 " : "=r"(ret) );
    return ret;
}
static inline void ckAsmSetCr4(uint32_t value)
{
    __asm__ __volatile__ ( "mov %0, %%cr4" : : "r"(value) );
}

#endif /* CONTROL_REGISTER_H_ */