2b72262b4f
I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and 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.
110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
/*
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* Copyright (c) 2011, 2012, 2014, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* x86-family/memorymanagement.h
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* Handles memory for the x86 family of architectures.
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*/
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#ifndef SORTIX_X86_FAMILY_MEMORYMANAGEMENT_H
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#define SORTIX_X86_FAMILY_MEMORYMANAGEMENT_H
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namespace Sortix {
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struct PML
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{
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addr_t entry[4096 / sizeof(addr_t)];
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};
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} // namespace Sortix
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namespace Sortix {
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namespace Memory {
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const addr_t PML_PRESENT = 1 << 0;
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const addr_t PML_WRITABLE = 1 << 1;
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const addr_t PML_USERSPACE = 1 << 2;
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const addr_t PML_WRTHROUGH = 1 << 3;
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const addr_t PML_NOCACHE = 1 << 4;
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const addr_t PML_PAT = 1 << 7;
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const addr_t PML_AVAILABLE1 = 1 << 9;
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const addr_t PML_AVAILABLE2 = 1 << 10;
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const addr_t PML_AVAILABLE3 = 1 << 11;
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const addr_t PML_FORK = PML_AVAILABLE1;
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#ifdef __x86_64__
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const addr_t PML_NX = 1UL << 63;
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#else
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const addr_t PML_NX = 0;
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#endif
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const addr_t PML_FLAGS = 0xFFFUL | PML_NX; // Bits used for the flags.
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const addr_t PML_ADDRESS = ~PML_FLAGS; // Bits used for the address.
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const addr_t PAT_UC = 0x00; // Uncacheable
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const addr_t PAT_WC = 0x01; // Write-Combine
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const addr_t PAT_WT = 0x04; // Writethrough
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const addr_t PAT_WP = 0x05; // Write-Protect
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const addr_t PAT_WB = 0x06; // Writeback
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const addr_t PAT_UCM = 0x07; // Uncacheable, overruled by MTRR.
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const addr_t PAT_NUM = 0x08;
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// Desired PAT-Register PA-Field Indexing (different from BIOS defaults)
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const addr_t PA[PAT_NUM] =
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{
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PAT_WB,
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PAT_WT,
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PAT_UCM,
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PAT_UC,
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PAT_WC,
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PAT_WP,
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0,
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0,
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};
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// Inverse function of the above.
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const addr_t PAINV[PAT_NUM] =
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{
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3, // UC
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4, // WC
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7, // No such
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8, // No such
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1, // WT
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5, // WP,
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0, // WB
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2, // UCM
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};
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static inline addr_t EncodePATAsPMLFlag(addr_t pat)
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{
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pat = PAINV[pat];
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addr_t result = 0;
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if ( pat & 0x1 ) { result |= PML_WRTHROUGH; }
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if ( pat & 0x2 ) { result |= PML_NOCACHE; }
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if ( pat & 0x4 ) { result |= PML_PAT; }
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return result;
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}
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bool MapPAT(addr_t physical, addr_t mapto, int prot, addr_t mtype);
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addr_t ProtectionToPMLFlags(int prot);
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int PMLFlagsToProtection(addr_t flags);
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} // namespace Memory
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} // namespace Sortix
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#if defined(__i386__)
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#include "../x86/memorymanagement.h"
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#elif defined(__x86_64__)
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#include "../x64/memorymanagement.h"
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#endif
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#endif
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