2019-03-26 18:20:23 +01:00
|
|
|
//----------------------------------------------------------------------------//
|
|
|
|
|
// GNU GPL OS/K //
|
|
|
|
|
// //
|
2020-01-12 16:53:23 +01:00
|
|
|
// Desc: GDT related functions //
|
2019-03-26 18:20:23 +01:00
|
|
|
// //
|
|
|
|
|
// //
|
2020-02-06 14:23:26 +01:00
|
|
|
// Copyright © 2018-2020 The OS/K Team //
|
2019-03-26 18:20:23 +01:00
|
|
|
// //
|
|
|
|
|
// 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/>. //
|
|
|
|
|
//----------------------------------------------------------------------------//
|
|
|
|
|
|
2020-01-12 16:53:23 +01:00
|
|
|
#include <mm/gdt.h>
|
|
|
|
|
#include <mm/paging.h>
|
2019-05-22 00:38:04 +02:00
|
|
|
#include <init/boot.h>
|
2019-03-26 18:20:23 +01:00
|
|
|
|
2020-01-06 00:30:50 +01:00
|
|
|
GdtPtr_t gdtPtr;
|
|
|
|
|
GdtEntry_t gdt[4] __attribute__((__aligned__(KPAGESIZE)));
|
|
|
|
|
TssDescriptor_t tssDesc __attribute__((__aligned__(KPAGESIZE)));
|
|
|
|
|
Tss_t tss __attribute__((__aligned__(KPAGESIZE)));
|
2019-03-29 10:29:05 +01:00
|
|
|
|
2019-05-19 23:33:34 +02:00
|
|
|
void MmInitGdt(void)
|
|
|
|
|
{
|
2019-05-22 00:38:04 +02:00
|
|
|
ushort tssOffset = (ushort)((ulong)(&gdt[2]) - (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));
|
|
|
|
|
|
|
|
|
|
gdt[1].lowLimit = 0xFFFF;
|
|
|
|
|
gdt[1].access = 0x98;
|
|
|
|
|
gdt[1].flags = 0x20;
|
|
|
|
|
|
2020-01-07 16:56:46 +01:00
|
|
|
gdt[2].lowLimit = 0xFFFF;
|
|
|
|
|
gdt[2].access = 0x98;
|
|
|
|
|
gdt[2].flags = 0x20;
|
|
|
|
|
|
2019-05-22 00:38:04 +02:00
|
|
|
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);
|
|
|
|
|
|
2020-02-03 13:43:40 +01:00
|
|
|
tss.ist1 = (ulong)memalign(4*KB, 4*KB) + 4*KB; // ISR RESCUE STACK
|
|
|
|
|
tss.ist2 = (ulong)memalign(4*KB, 4*KB) + 4*KB; // ISR STACK
|
|
|
|
|
tss.ist3 = (ulong)memalign(4*KB, 4*KB) + 4*KB; // ISR STACK
|
2019-05-22 00:38:04 +02:00
|
|
|
tss.iomap_base = sizeof(tss);
|
|
|
|
|
|
2020-02-06 13:18:22 +01:00
|
|
|
DebugLog("ISR Stacks initialized : Rescue %p, Normal %p, %p\n",
|
|
|
|
|
tss.ist1,
|
|
|
|
|
tss.ist2,
|
|
|
|
|
tss.ist3);
|
2020-02-03 13:43:40 +01:00
|
|
|
|
2019-05-22 00:38:04 +02:00
|
|
|
memmove(&gdt[2], &tssDesc, sizeof(TssDescriptor_t));
|
|
|
|
|
|
2020-02-06 17:45:44 +01:00
|
|
|
DebugLog("TSS setting up :\n"
|
|
|
|
|
"gdt[0] %#x\n"
|
|
|
|
|
"gdt[2] %#x\n"
|
|
|
|
|
"access : %#x\n"
|
|
|
|
|
"flags : %#x\n"
|
|
|
|
|
"lowBase : %#x\n"
|
|
|
|
|
"middleBase : %#x\n"
|
|
|
|
|
"highBase : %#x\n"
|
|
|
|
|
"veryHighBase: %#x\n"
|
|
|
|
|
"lowLimit : %#x\n"
|
|
|
|
|
"ist : %#x\n"
|
|
|
|
|
"iomap_base : %#x\n"
|
|
|
|
|
"offset : %#x\n",
|
|
|
|
|
&gdt[0],
|
|
|
|
|
&gdt[2],
|
|
|
|
|
tssDesc.access,
|
|
|
|
|
tssDesc.flags,
|
|
|
|
|
tssDesc.lowBase,
|
|
|
|
|
tssDesc.middleBase,
|
|
|
|
|
tssDesc.highBase,
|
|
|
|
|
tssDesc.veryHighBase,
|
|
|
|
|
tssDesc.lowLimit,
|
|
|
|
|
tss.ist1,
|
|
|
|
|
tss.iomap_base,
|
|
|
|
|
tssOffset
|
|
|
|
|
);
|
2019-05-22 00:38:04 +02:00
|
|
|
|
|
|
|
|
MmLoadGdt(&gdtPtr, tssOffset);
|
2019-03-29 10:29:05 +01:00
|
|
|
}
|
