contiki/cpu/x86/mm/ldt-layout.h

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/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 CPU_X86_MM_LDT_LAYOUT_H_
#define CPU_X86_MM_LDT_LAYOUT_H_
#include "gdt-layout.h"
/* Each LDT can contain up to this many descriptors, but some protection
* domains may not use all of the slots.
*/
#define LDT_NUM_DESC 3
/**
* Provides access to kernel data. Most protection domains are granted at most
* read-only access, but the kernel protection domain is granted read/write
* access.
*/
#define LDT_IDX_KERN 0
/** Maps a device MMIO range */
#define LDT_IDX_MMIO 1
/** Maps domain-defined metadata */
#define LDT_IDX_META 2
#define LDT_SEL(idx, rpl) (GDT_SEL(idx, rpl) | (1 << 2))
#define LDT_SEL_KERN LDT_SEL(LDT_IDX_KERN, PRIV_LVL_USER)
#define LDT_SEL_MMIO LDT_SEL(LDT_IDX_MMIO, PRIV_LVL_USER)
#define LDT_SEL_META LDT_SEL(LDT_IDX_META, PRIV_LVL_USER)
#define LDT_SEL_STK LDT_SEL(LDT_IDX_STK, PRIV_LVL_USER)
#endif /* CPU_X86_MM_LDT_LAYOUT_H_ */