/*****************************************************************************************
Copyright (c) 2002-2004 The UbixOS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of
conditions, the following disclaimer and the list of authors. Redistributions in binary
form must reproduce the above copyright notice, this list of conditions, the following
disclaimer and the list of authors in the documentation and/or other materials provided
with the distribution. Neither the name of the UbixOS Project nor the names of its
contributors may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
$Id$
*****************************************************************************************/
#include <sys/idt.h>
#include <sys/gdt.h>
#include <sys/io.h>
#include <ubixos/sched.h>
#include <isa/8259.h>
#include <lib/kprintf.h>
#include <lib/kmalloc.h>
#include <vmm/vmm.h>
#include <ubixos/syscall.h>
#include <ubixos/kpanic.h>
#include <ubixos/endtask.h>
#define FP_TO_LINEAR(seg, off) ((void*) ((((uInt16) (seg)) << 4) + ((uInt16) (off))))
static ubixDescriptorTable(ubixIDT, 256) { };
static struct {
unsigned short limit __attribute__((packed));
union descriptorTableUnion *idt __attribute__((packed));
} loadidt = {
(256 * sizeof(union descriptorTableUnion) - 1), ubixIDT
};
/************************************************************************
Function: int idtInit()
Description: This function is used to enable our IDT subsystem
Notes:
02/20/2004 - Approved for quality
************************************************************************/
int idt_init() {
int i = 0x0;
struct tssStruct *sfTSS = (struct tssStruct *)0x6200;
struct tssStruct *gpfTSS = (struct tssStruct *)0x4200;
/* Set up default vector table for all possible 256 interrupts */
for (i = 0x0; i < 256; i++) {
setVector(intNull, i, dPresent + dInt + dDpl3);
}
/* Load the IDT into the system */
asm volatile(
"cli \n"
"lidt (%0) \n" /* Load the IDT */
"pushfl \n" /* Clear the NT flag */
"andl $0xffffbfff,(%%esp) \n"
"popfl \n"
"sti \n"
:
: "r" ((char *)&loadidt)
);
/* Set up the basic vectors for the reserved ints */
setVector(_int0, 0, dPresent + dInt + dDpl0);
setVector(_int1, 1, dPresent + dInt + dDpl0);
setVector(_int2, 2, dPresent + dInt + dDpl0);
setVector(_int3, 3, dPresent + dInt + dDpl0);
setVector(_int4, 4, dPresent + dInt + dDpl0);
setVector(_int5, 5, dPresent + dInt + dDpl0);
setVector(_int6, 6, dPresent + dInt + dDpl0);
setVector(_int7,7,dPresent + dInt + dDpl0);
setTaskVector(8,dPresent + dTask + dDpl0, 0x40);
setVector(_int9, 9, dPresent + dInt + dDpl0);
setVector(_int10, 10, dPresent + dInt + dDpl0);
setVector(_int11, 11, dPresent + dInt + dDpl0);
setVector(_int12, 12, dPresent + dInt + dDpl0);
setTaskVector(13, dPresent + dTask + dDpl0, 0x38);
setVector(_vmm_pageFault, 14, dPresent + dInt + dDpl0);
setVector(_sysCall, 128, dPresent + dTrap + dDpl3);
setVector(_sysCallNew, 0x90, dPresent + dTrap + dDpl3);
setVector(timerInt, 0x68, (dInt + dPresent + dDpl0));
gpfTSS->back_link = 0x0;
gpfTSS->esp0 = 0x0;
gpfTSS->ss0 = 0x0;
gpfTSS->esp1 = 0x0;
gpfTSS->ss1 = 0x0;
gpfTSS->esp2 = 0x0;
gpfTSS->ss2 = 0x0;
gpfTSS->cr3 = (unsigned int)kernelPageDirectory;
gpfTSS->eip = (unsigned int)&_int13;
gpfTSS->eflags = 0x206;
gpfTSS->esp = 0x1D000;
gpfTSS->ebp = 0x1D000;
gpfTSS->esi = 0x0;
gpfTSS->edi = 0x0;
gpfTSS->es = 0x10;
gpfTSS->cs = 0x08;
gpfTSS->ss = 0x10;
gpfTSS->ds = 0x10;
gpfTSS->fs = 0x10;
gpfTSS->gs = 0x10;
gpfTSS->ldt = 0x0;
gpfTSS->trace_bitmap = 0x0000;
gpfTSS->io_map = 0x8000;
memset(sfTSS,0x0,sizeof(struct tssStruct));
sfTSS->cr3 = (unsigned int)kernelPageDirectory;
sfTSS->eip = (unsigned int)&_int8;
sfTSS->eflags = 0x206;
sfTSS->esp = 0x1C000;
sfTSS->ebp = 0x1C000;
sfTSS->es = 0x10;
sfTSS->cs = 0x08;
sfTSS->ss = 0x10;
sfTSS->ds = 0x10;
sfTSS->fs = 0x10;
sfTSS->gs = 0x10;
sfTSS->io_map = 0x8000;
/* Print out information for the IDT */
kprintf("idt0 - Address: [0x%X]\n", &ubixIDT);
/* Return so we know all went well */
return (0x0);
}
/* Sets Up IDT Vector */
void setVector(void *handler, unsigned char interrupt, unsigned short controlMajor) {
unsigned short codesegment = 0x08;
asm volatile ("movw %%cs,%0":"=g" (codesegment));
ubixIDT[interrupt].gate.offsetLow = (unsigned short)(((unsigned long)handler) & 0xffff);
ubixIDT[interrupt].gate.selector = codesegment;
ubixIDT[interrupt].gate.access = controlMajor;
ubixIDT[interrupt].gate.offsetHigh = (unsigned short)(((unsigned long)handler) >> 16);
}
/************************************************************************
Function: void setTaskVector(uInt8,uInt16,uInt8);
Description: This Function Sets Up An IDT Task Vector
Notes:
************************************************************************/
void
setTaskVector(uInt8 interrupt, uInt16 controlMajor, uInt8 selector)
{
uInt16 codesegment = 0x08;
asm volatile ("movw %%cs,%0":"=g" (codesegment));
ubixIDT[interrupt].gate.offsetLow = 0x0;
ubixIDT[interrupt].gate.selector = selector;
ubixIDT[interrupt].gate.access = controlMajor;
ubixIDT[interrupt].gate.offsetHigh = 0x0;
}
/* Null Intterupt Descriptor */
void intNull() {
kpanic("Invalid Interrupt[%i]\n",_current->id);
while (1);
endTask(_current->id);
schedYield();
}
void _int0() {
kpanic("int0: Divide-by-Zero [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int1() {
kpanic("int1: Debug exception [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int2() {
kpanic("int2: unknown error [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int3() {
kpanic("int3: Breakpoint [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int4(){
kpanic("int4: Overflow [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int5() {
kpanic("int5: Bounds check [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int6() {
kpanic("int6: Invalid opcode! [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int8() {
struct tssStruct *sfTSS = (struct tssStruct *)0x6200;
kpanic("int8: Double Fault! [%i]\n",_current->id);
sfTSS->cr3 = (unsigned int)kernelPageDirectory;
sfTSS->eip = (unsigned int)&_int8;
sfTSS->eflags = 0x206;
sfTSS->esp = 0x1C000;
sfTSS->ebp = 0x1C000;
sfTSS->es = 0x10;
sfTSS->cs = 0x08;
sfTSS->ss = 0x10;
sfTSS->ds = 0x10;
sfTSS->fs = 0x10;
sfTSS->gs = 0x10;
sfTSS->io_map = 0x8000;
while (1);
}
void _int9() {
kpanic("int9: Coprocessor Segment Overrun! [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int10() {
kpanic("int10: Invalid TSS! [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int11() {
kpanic("int11: Segment Not Present! [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int12() {
kpanic("int12: Stack-Segment Fault! [%i]\n",_current->id);
endTask(_current->id);
schedYield();
}
void _int13() {
uInt8 *ip = 0x0;
uInt16 *stack = 0x0, *ivt = 0x0;
uInt32 *stack32 = 0x0;
bool isOperand32 = FALSE, isAddress32 = FALSE;
struct tssStruct *gpfTSS = (struct tssStruct *)0x4200;
irqDisable(0x0);
gpfTSS->eip = (unsigned int)&_int13;
gpfTSS->esp = 0x1D000;
gpfTSS->ebp = 0x1D000;
gpfTSS->eflags = 0x206;
ip = FP_TO_LINEAR(_current->tss.cs, _current->tss.eip);
ivt = (uInt16 *) 0x0;
stack = (uInt16 *) FP_TO_LINEAR(_current->tss.ss,_current->tss.esp);
stack32 = (uInt32 *) stack;
gpfStart:
switch (ip[0]) {
case 0xCD: /* INT n */
switch (ip[1]) {
case 0x69:
kprintf("Exit Bios [0x%X]\n",_current->id);
_current->state = DEAD;
break;
case 0x20:
case 0x21:
kpanic("GPF OP 0x20/0x21\n");
break;
default:
stack -= 3;
_current->tss.esp = ((_current->tss.esp & 0xffff) - 6) & 0xffff;
stack[0] = (uInt16) (_current->tss.eip + 2);
stack[1] = _current->tss.cs; stack[2] = (uInt16) _current->tss.eflags;
if (_current->oInfo.v86If)
stack[2] |= EFLAG_IF;
else
stack[2] &= ~EFLAG_IF;
_current->tss.cs = ivt[ip[1] * 2 + 1] & 0xFFFF;
_current->tss.eip = ivt[ip[1] * 2] & 0xFFFF;
break;
}
break;
case 0x66:
isOperand32 = TRUE;
ip++;
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
goto gpfStart;
break;
case 0x67:
isAddress32 = TRUE;
ip++;
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
goto gpfStart;
break;
case 0xF0:
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
kpanic("GPF OP 0xF0\n");
break;
case 0x9C:
if (isOperand32 == TRUE) {
_current->tss.esp = ((_current->tss.esp & 0xffff) - 4) & 0xffff;
stack32--;
stack32[0] = _current->tss.eflags & 0xDFF;
if (_current->oInfo.v86If == TRUE)
stack32[0] |= EFLAG_IF;
else stack32[0] &= ~EFLAG_IF;
} else {
_current->tss.esp = ((_current->tss.esp & 0xffff) - 2) & 0xffff;
stack--;
stack[0] = (uInt16) _current->tss.eflags;
if (_current->oInfo.v86If == TRUE) stack[0] |= EFLAG_IF;
else stack[0] &= ~EFLAG_IF;
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
}
break;
case 0x9D:
if (isOperand32 == TRUE) {
_current->tss.eflags = EFLAG_IF | EFLAG_VM | (stack32[0] & 0xDFF);
_current->oInfo.v86If = (stack32[0] & EFLAG_IF) != 0;
_current->tss.esp = ((_current->tss.esp & 0xffff) + 4) & 0xffff;
} else {
_current->tss.eflags = EFLAG_IF | EFLAG_VM | stack[0];
_current->oInfo.v86If = (stack[0] & EFLAG_IF) != 0;
_current->tss.esp = ((_current->tss.esp & 0xffff) + 2) & 0xffff;
}
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
/* kprintf("popf [0x%X]\n",_current->id); */
break;
case 0xFA:
_current->oInfo.v86If = FALSE;
_current->tss.eflags &= ~EFLAG_IF;
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
_current->oInfo.timer = 0x1;
break;
case 0xFB:
_current->oInfo.v86If = TRUE;
_current->tss.eflags |= EFLAG_IF;
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
_current->oInfo.timer = 0x0;
/* kprintf("sti [0x%X]\n",_current->id); */
break;
case 0xCF:
_current->tss.eip = stack[0];
_current->tss.cs = stack[1];
_current->tss.eflags = EFLAG_IF | EFLAG_VM | stack[2];
_current->oInfo.v86If = (stack[2] & EFLAG_IF) != 0;
_current->tss.esp = ((_current->tss.esp & 0xffff) + 6) & 0xffff;
/* kprintf("iret [0x%X]\n",_current->id); */
break;
case 0xEC: /* IN AL,DX */
_current->tss.eax = (_current->tss.eax & ~0xFF) | inportByte(_current->tss.edx);
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
break;
case 0xED: /* IN AX,DX */
_current->tss.eax = (_current->tss.eax & ~0xFFFF) | inportWord(_current->tss.edx);
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
break;
case 0xEE: /* OUT DX,AL */
outportByte(_current->tss.edx, _current->tss.eax & 0xFF);
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
break;
case 0xEF:
outportWord(_current->tss.edx, _current->tss.eax);
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
break;
case 0xF4:
_current->tss.eip = (uInt16) (_current->tss.eip + 1);
break;
default: /* something wrong */
kprintf("NonHandled OpCode [0x%X:0x%X]\n",_current->id,ip[0]);
_current->state = DEAD;
break;
}
irqEnable(0);
while (1);
}
static void mathStateRestore() {
if (_usedMath != 0x0) {
asm(
"fnsave %0"
:
: "m" (_usedMath->i387)
);
}
if (_current->usedMath != 0x0) {
asm(
"frstor %0"
:
: "m" (_current->i387)
);
}
else {
asm("fninit");
_current->usedMath = 0x1;
}
_usedMath=_current;
//Return
}
void _int7();
asm(
".globl _int7 \n"
"_int7: \n"
" pushl %eax \n"
" clts \n"
" movl _current,%eax \n"
" cmpl _usedMath,%eax \n"
" je mathDone \n"
" call mathStateRestore \n"
"mathDone: \n"
" popl %eax \n"
" iret \n"
);
/***
$Log$
Revision 1.26 2004/07/31 21:52:17 reddawg
a few changes
Revision 1.25 2004/07/29 21:32:16 reddawg
My quick lunchs breaks worth of updates....
Revision 1.24 2004/07/28 22:23:02 reddawg
make sure it still works before I goto bed
Revision 1.23 2004/07/28 15:05:43 reddawg
Major:
Pages now have strict security enforcement.
Many null dereferences have been resolved.
When apps loaded permissions set for pages rw and ro
Revision 1.22 2004/07/28 00:17:05 reddawg
Major:
Disconnected page 0x0 from the system... Unfortunately this broke many things
all of which have been fixed. This was good because nothing deferences NULL
any more.
Things affected:
malloc,kmalloc,getfreepage,getfreevirtualpage,pagefault,fork,exec,ld,ld.so,exec,file
Revision 1.21 2004/07/25 05:32:58 reddawg
fixed
Revision 1.20 2004/07/24 20:00:51 reddawg
Lots of changes to the vmm subsystem.... Page faults have been adjust to now be blocking on a per thread basis not system wide. This has resulted in no more deadlocks.. also the addition of per thread locking has removed segfaults as a result of COW in which two tasks fault the same COW page and try to modify it.
Revision 1.19 2004/07/24 15:12:56 reddawg
Now I'm current
Revision 1.18 2004/07/16 04:06:32 reddawg
Tune ups this stuff should of been taken care of months ago
Revision 1.17 2004/07/09 13:16:41 reddawg
idt: idtInit to idt_init
Adjusted Startup Routines
Revision 1.16 2004/07/05 23:05:32 reddawg
New Syscalls
Revision 1.15 2004/06/29 11:41:44 reddawg
Fixed some global variables
Revision 1.14 2004/06/17 12:11:14 reddawg
timerInt: removed from src/sys/sys/idt.c and moved into a file by itself
in src/sys/kernel/timer.S
Revision 1.13 2004/06/16 12:27:50 reddawg
Added Comments To Timer Interrupt
Revision 1.12 2004/06/16 12:04:19 reddawg
systemVitals->quantum = (1000/msPerQuantum)
The timer int now will call scheduler at the rate of the defined quantum
Revision 1.11 2004/06/15 12:14:38 reddawg
Cleaned Up
Revision 1.10 2004/06/14 12:20:54 reddawg
notes: many bugs repaired and ld works 100% now.
Revision 1.9 2004/06/04 10:19:42 reddawg
notes: we compile again, thank g-d anyways i was about to cry
Revision 1.8 2004/05/21 16:04:32 reddawg
Typo i hate working in windows then test compiling later
Revision 1.7 2004/05/21 16:02:49 reddawg
We now end faulted tasks instead of holding them
Revision 1.6 2004/05/21 16:00:39 reddawg
We now end faulted tasks instead of holding them
Revision 1.5 2004/05/21 13:33:24 reddawg
Went from 200MS per quantum to 25MS
Revision 1.4 2004/04/30 13:57:23 reddawg
*** empty log message ***
Revision 1.3 2004/04/30 13:40:35 reddawg
Just doing spring cleaning for the new members
Revision 1.1.1.1 2004/04/15 12:07:17 reddawg
UbixOS v1.0
Revision 1.29 2004/04/13 16:36:34 reddawg
Changed our copyright, it is all now under a BSD-Style license
END
***/
