From fe41bc864aef001222ab81caf0acf0cce472dbfa Mon Sep 17 00:00:00 2001 From: Adrien Bourmault Date: Tue, 26 Mar 2019 18:20:23 +0100 Subject: [PATCH] stuff --- kaleid/kernel/mm/gdt.c | 50 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 kaleid/kernel/mm/gdt.c diff --git a/kaleid/kernel/mm/gdt.c b/kaleid/kernel/mm/gdt.c new file mode 100644 index 0000000..ae395a6 --- /dev/null +++ b/kaleid/kernel/mm/gdt.c @@ -0,0 +1,50 @@ +//----------------------------------------------------------------------------// +// 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 . // +//----------------------------------------------------------------------------// + +#include + +// 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; +} +