mirror of
https://gitlab.os-k.eu/os-k-team/os-k.git
synced 2023-08-25 14:03:10 +02:00
88 lines
3.8 KiB
C
88 lines
3.8 KiB
C
//----------------------------------------------------------------------------//
|
|
// OS on Kaleid //
|
|
// //
|
|
// Desc: GDT related functions //
|
|
// //
|
|
// //
|
|
// Copyright © 2018-2021 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 <mm/gdt.h>
|
|
#include <mm/paging.h>
|
|
#include <init/boot.h>
|
|
|
|
GdtPtr_t gdtPtr;
|
|
GdtEntry_t gdt[5] __attribute__((__aligned__(KPAGESIZE)));
|
|
TssDescriptor_t tssDesc __attribute__((__aligned__(KPAGESIZE)));
|
|
Tss_t tss __attribute__((__aligned__(KPAGESIZE)));
|
|
|
|
void MmInitGdt(void)
|
|
{
|
|
ushort tssOffset = (ushort)((ulong)(&gdt[3]) - (ulong)(&gdt[0]));
|
|
|
|
gdtPtr.base = (ulong)&gdt[0];
|
|
gdtPtr.limit = sizeof(gdt) - 1;
|
|
|
|
memzero((void *)&gdt[0], sizeof(gdt));
|
|
memzero((void *)&tssDesc, sizeof(tssDesc));
|
|
memzero((void *)&tss, sizeof(tss));
|
|
|
|
// Kernel codeseg
|
|
gdt[1].lowLimit = 0xFFFF;
|
|
gdt[1].access = 0x98;
|
|
gdt[1].flags = 0x20;
|
|
|
|
// User codeseg
|
|
gdt[2].lowLimit = 0xFFFF;
|
|
gdt[2].access = 0xF8;
|
|
gdt[2].flags = 0x20;
|
|
|
|
tssDesc.access = 0x89;
|
|
tssDesc.flags = 0x40;
|
|
tssDesc.lowBase = (ulong)&tss & 0xFFFF;
|
|
tssDesc.middleBase = ((ulong)&tss >> 16) & 0xFF;
|
|
tssDesc.highBase = ((ulong)&tss >> 24) & 0xFF;
|
|
tssDesc.veryHighBase = ((ulong)&tss >> 32) & 0xFFFFFFFF;
|
|
tssDesc.lowLimit = sizeof(tss);
|
|
|
|
tss.ist1 = (ulong)memalign(4*MB, 4*KB) + 4*MB; // ISR RESCUE STACK
|
|
tss.ist2 = (ulong)memalign(4*MB, 4*KB) + 4*MB; // ISR STACK
|
|
tss.ist3 = (ulong)memalign(4*MB, 4*KB) + 4*MB; // ISR STACK
|
|
tss.rsp0 = (ulong)memalign(4*MB, 4*KB) + 4*MB; // Another Stack
|
|
tss.iomap_base = sizeof(tss);
|
|
|
|
DebugLog("ISR Stacks initialized : Rescue %p, Normal %p, %p\n",
|
|
tss.ist1,
|
|
tss.ist2,
|
|
tss.ist3);
|
|
|
|
memmove(&gdt[3], &tssDesc, sizeof(TssDescriptor_t));
|
|
|
|
DebugLog("GDT & TSS initialized\n");
|
|
DebugLog("gdt[0] : %#x\n", &gdt[0]);
|
|
DebugLog("gdt[1] : %#x\n", &gdt[1]);
|
|
DebugLog("gdt[2] : %#x\n", &gdt[2]);
|
|
DebugLog("tss : %#x\n", &gdt[3]);
|
|
DebugLog("ist1 : %#x\n", tss.ist1);
|
|
DebugLog("ist2 : %#x\n", tss.ist2);
|
|
DebugLog("ist3 : %#x\n", tss.ist3);
|
|
DebugLog("rsp0 : %#x\n", tss.ist1);
|
|
|
|
MmLoadGdt(&gdtPtr, tssOffset);
|
|
}
|