83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Mapping and checking memory related functions //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <kernel/mm.h>
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GdtEntry_t gdtEntries[5] = { 0 };
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TssEntry_t tssEntry = { 0 };
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GdtPtr_t gdtPtr;
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static void SetGdtEntry(int index, uint base, uint limit, uchar access)
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{
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gdtEntries[index].lowBase = (base & 0xFFFF);
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gdtEntries[index].middleBase = (base >> 16) & 0xFF;
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gdtEntries[index].highBase = (base >> 24) & 0xFF;
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gdtEntries[index].lowLimit = (limit & 0xFFFF);
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gdtEntries[index].granularity = (limit >> 16) & 0x0F;
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gdtEntries[index].granularity |= 0xA0;
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// 0x10 is system
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// 0x80 is present
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gdtEntries[index].access = access | 0x10 | 0x80;
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}
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static void SetTssEntry(uchar index, ulong base, ulong limit)
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{
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TssDescriptor_t tssDesc = { 0 };
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tssDesc.limitLow = limit & 0xffff;
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tssDesc.size = (limit >> 16) & 0xf;
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tssDesc.base00 = base & 0xffff;
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tssDesc.base16 = (base >> 16) & 0xff;
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tssDesc.base24 = (base >> 24) & 0xff;
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tssDesc.base32 = (base >> 32) & 0xffffffff;
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tssDesc.reserved = 0;
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tssDesc.access = 0x01 | 0x08 | 0x10 | 0x80;
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memmove(&gdtEntries[index], &tssDesc, sizeof(TssDescriptor_t));
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}
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void MmInitGdt(void)
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{
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gdtPtr.limit = (sizeof(GdtEntry_t) * 5) - 1;
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gdtPtr.base = (uint)(ullong)&gdtEntries;
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MmStoreGdt();
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/* SetGdtEntry(1, 0x0, 0xfffff, 0x02 | 0x08); */
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/* tssEntry.ioMapOffset = sizeof(TssEntry_t); */
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/* SetTssEntry(2, (ulong)&tssEntry, sizeof(TssEntry_t)); */
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/* MmLoadGdt(0x8, 0x0, 2 << 3); */
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}
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