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60 lines
2.4 KiB
C
60 lines
2.4 KiB
C
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/*
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* Copyright (C) 2015, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CPU_X86_MM_LDT_LAYOUT_H_
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#define CPU_X86_MM_LDT_LAYOUT_H_
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#include "gdt-layout.h"
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/* Each LDT can contain up to this many descriptors, but some protection
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* domains may not use all of the slots.
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*/
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#define LDT_NUM_DESC 3
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/**
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* Provides access to kernel data. Most protection domains are granted at most
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* read-only access, but the kernel protection domain is granted read/write
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* access.
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*/
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#define LDT_IDX_KERN 0
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/** Maps a device MMIO range */
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#define LDT_IDX_MMIO 1
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/** Maps domain-defined metadata */
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#define LDT_IDX_META 2
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#define LDT_SEL(idx, rpl) (GDT_SEL(idx, rpl) | (1 << 2))
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#define LDT_SEL_KERN LDT_SEL(LDT_IDX_KERN, PRIV_LVL_USER)
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#define LDT_SEL_MMIO LDT_SEL(LDT_IDX_MMIO, PRIV_LVL_USER)
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#define LDT_SEL_META LDT_SEL(LDT_IDX_META, PRIV_LVL_USER)
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#define LDT_SEL_STK LDT_SEL(LDT_IDX_STK, PRIV_LVL_USER)
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#endif /* CPU_X86_MM_LDT_LAYOUT_H_ */
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