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stuff

This commit is contained in:
Adrien Bourmault 2019-03-26 18:20:23 +01:00
parent 669236cea1
commit fe41bc864a
1 changed files with 50 additions and 0 deletions
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kaleid/kernel/mm/gdt.c Normal file
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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
// Desc: Mapping and checking memory related functions //
// //
// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
//----------------------------------------------------------------------------//
#include <kernel/mm.h>
// The Gdt
GdtEntry_t gdtEntries[5];
GdtPtr_t gdtPtr;
void MmInitGdt(void)
{
gdtPtr.limit = (sizeof(gdt_entry_t) * 5) - 1;
gdtPtr.base = (uint)&gdt_entries;
}
static void MmSetGdtEntry(int index, uint base, uint limit, uchar access,
uchar granularity)
{
gdtEntries[num].lowBase = (base & 0xFFFF);
gdtEntries[num].middleBase = (base >> 16) & 0xFF;
gdtEntries[num].highBase = (base >> 24) & 0xFF;
gdtEntries[num].lowLimit = (limit & 0xFFFF);
gdtEntries[num].granularity = (limit >> 16) & 0x0F;
gdtEntries[num].granularity |= gran & 0xF0;
gdtEntries[num].access = access;
}