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Bochs/bochs/cpu/io.cc
Stanislav Shwartsman f096a80716 Fix code duplication for check_cs descriptor 
The function will execute
 - segment is executable code segment
 - conforming/non-conforming segment priviledge checks
 - segment is present
2005-08-01 21:40:17 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id: io.cc,v 1.28 2005-08-01 21:40:17 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#define NEED_CPU_REG_SHORTCUTS 1
#include "bochs.h"
#include "iodev/iodev.h"
#define LOG_THIS BX_CPU_THIS_PTR
#if BX_SUPPORT_X86_64==0
// Make life easier for merging cpu64 and cpu32 code.
#define RDI EDI
#define RSI ESI
#define RAX EAX
#endif
void BX_CPU_C::INSB_YbDX(bxInstruction_c *i)
{
Bit8u value8=0;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR get_VM () || (CPL>BX_CPU_THIS_PTR get_IOPL ()))) {
if ( !BX_CPU_THIS_PTR allow_io(DX, 1) ) {
exception(BX_GP_EXCEPTION, 0, 0);
}
}
#if BX_SUPPORT_X86_64
if (i->as64L()) {
// Write a zero to memory, to trigger any segment or page
// faults before reading from IO port.
write_virtual_byte(BX_SEG_REG_ES, RDI, &value8);
value8 = BX_INP(DX, 1);
/* no seg override possible */
write_virtual_byte(BX_SEG_REG_ES, RDI, &value8);
if (BX_CPU_THIS_PTR get_DF ())
RDI--;
else
RDI++;
}
else
#endif
if (i->as32L()) {
// Write a zero to memory, to trigger any segment or page
// faults before reading from IO port.
write_virtual_byte(BX_SEG_REG_ES, EDI, &value8);
value8 = BX_INP(DX, 1);
/* no seg override possible */
write_virtual_byte(BX_SEG_REG_ES, EDI, &value8);
if (BX_CPU_THIS_PTR get_DF ()) {
RDI = EDI - 1;
}
else {
RDI = EDI + 1;
}
}
else {
// Write a zero to memory, to trigger any segment or page
// faults before reading from IO port.
write_virtual_byte(BX_SEG_REG_ES, DI, &value8);
value8 = BX_INP(DX, 1);
/* no seg override possible */
write_virtual_byte(BX_SEG_REG_ES, DI, &value8);
if (BX_CPU_THIS_PTR get_DF ())
DI--;
else
DI++;
}
}
void BX_CPU_C::INSW_YvDX(bxInstruction_c *i)
// input word/doubleword from port to string
{
bx_address edi;
unsigned int incr;
#if BX_SUPPORT_X86_64
if (i->as64L()) // This was coded as if (i->as_64) ???
edi = RDI;
else
#endif
if (i->as32L())
edi = EDI;
else
edi = DI;
if (i->os32L()) {
Bit32u value32=0;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR get_VM () || (CPL>BX_CPU_THIS_PTR get_IOPL ()))) {
if ( !BX_CPU_THIS_PTR allow_io(DX, 4) ) {
exception(BX_GP_EXCEPTION, 0, 0);
}
}
// Write a zero to memory, to trigger any segment or page
// faults before reading from IO port.
write_virtual_dword(BX_SEG_REG_ES, edi, &value32);
value32 = BX_INP(DX, 4);
/* no seg override allowed */
write_virtual_dword(BX_SEG_REG_ES, edi, &value32);
incr = 4;
}
else {
Bit16u value16=0;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR get_VM () || (CPL>BX_CPU_THIS_PTR get_IOPL ()))) {
if ( !BX_CPU_THIS_PTR allow_io(DX, 2) )
exception(BX_GP_EXCEPTION, 0, 0);
}
#if BX_SupportRepeatSpeedups
#if (BX_DEBUGGER == 0)
#if (defined(__i386__) && __i386__)
/* If conditions are right, we can transfer IO to physical memory
* in a batch, rather than one instruction at a time.
*/
if (i->repUsedL() && !BX_CPU_THIS_PTR async_event) {
Bit32u wordCount;
#if BX_SUPPORT_X86_64
if (i->as64L())
wordCount = RCX; // Truncated to 32bits. (we're only doing 1 page)
else
#endif
if (i->as32L())
wordCount = ECX;
else
wordCount = CX;
if (wordCount) {
bx_address laddrDst;
Bit32u paddrDst, wordsFitDst;
Bit8u *hostAddrDst;
bx_segment_reg_t *dstSegPtr;
int pointerDelta;
dstSegPtr = &BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES];
// Do segment checks for the 1st word. We do not want to
// trip an exception beyond this, because the address would
// be incorrect. After we know how many bytes we will directly
// transfer, we can do the full segment limit check ourselves
// without generating an exception.
write_virtual_checks(dstSegPtr, edi, 2);
laddrDst = BX_CPU_THIS_PTR get_segment_base(BX_SEG_REG_ES) + edi;
if (BX_CPU_THIS_PTR cr0.pg)
paddrDst = dtranslate_linear(laddrDst, CPL==3, BX_WRITE);
else
paddrDst = laddrDst;
// If we want to write directly into the physical memory array,
// we need the A20 address.
paddrDst = A20ADDR(paddrDst);
hostAddrDst = BX_CPU_THIS_PTR mem->getHostMemAddr(BX_CPU_THIS,
paddrDst, BX_WRITE);
// Check that native host access was not vetoed for that page, and
// that the address is word aligned.
if ( hostAddrDst && ! (paddrDst & 1) ) {
// See how many words can fit in the rest of this page.
if (BX_CPU_THIS_PTR get_DF ()) {
// Counting downward.
// Note: 1st word must not cross page boundary.
if ( (paddrDst & 0xfff) > 0xffe )
goto noAcceleration;
wordsFitDst = (2 + (paddrDst & 0xfff)) >> 1;
pointerDelta = -2;
}
else {
// Counting upward.
wordsFitDst = (0x1000 - (paddrDst & 0xfff)) >> 1;
pointerDelta = 2;
}
// Restrict word count to the number that will fit in this page.
if (wordCount > wordsFitDst)
wordCount = wordsFitDst;
// If after all the restrictions, there is anything left to do...
if (wordCount) {
unsigned j;
Bit32u dstSegLimit;
dstSegLimit = dstSegPtr->cache.u.segment.limit_scaled;
// For 16-bit addressing mode, clamp the segment limits to 16bits
// so we don't have to worry about computations using si/di
// rolling over 16-bit boundaries.
if (!i->as32L()) {
if (dstSegLimit > 0xffff)
dstSegLimit = 0xffff;
}
// Before we copy memory, we need to make sure that the segments
// allow the accesses up to the given source and dest offset. If
// the cache.valid bits have SegAccessWOK and ROK, we know that
// the cache is valid for those operations, and that the segments
// are non-expand down (thus we can make a simple limit check).
if ( !(dstSegPtr->cache.valid & SegAccessWOK) ) {
goto noAcceleration;
}
if (BX_CPU_THIS_PTR cpu_mode != BX_MODE_LONG_64) {
// Now make sure transfer will fit within the constraints of the
// segment boundaries, 0..limit for non expand-down. We know
// wordCount >= 1 here.
if (BX_CPU_THIS_PTR get_DF ()) {
// Counting downward.
Bit32u minOffset = (wordCount-1) << 1;
if ( edi < minOffset )
goto noAcceleration;
}
else {
// Counting upward.
Bit32u dstMaxOffset = (dstSegLimit - (wordCount<<1)) + 1;
if ( edi > dstMaxOffset )
goto noAcceleration;
}
}
for (j=0; j<wordCount; ) {
Bit16u temp16;
bx_devices.bulkIOQuantumsTransferred = 0;
if ( BX_CPU_THIS_PTR get_DF ()==0 ) { // Only do accel for DF=0
bx_devices.bulkIOHostAddr = hostAddrDst;
bx_devices.bulkIOQuantumsRequested = (wordCount - j);
}
else
bx_devices.bulkIOQuantumsRequested = 0;
temp16 = BX_INP(DX, 2);
if ( bx_devices.bulkIOQuantumsTransferred ) {
hostAddrDst = bx_devices.bulkIOHostAddr;
j += bx_devices.bulkIOQuantumsTransferred;
}
else {
* (Bit16u *) hostAddrDst = temp16;
hostAddrDst += pointerDelta;
j++;
}
// Terminate early if there was an event.
if ( BX_CPU_THIS_PTR async_event )
break;
}
// Reset for next non-bulk IO.
bx_devices.bulkIOQuantumsRequested = 0;
wordCount = j;
// Decrement eCX. Note, the main loop will decrement 1 also, so
// decrement by one less than expected, like the case above.
BX_TICKN(j-1); // Main cpu loop also decrements one more.
#if BX_SUPPORT_X86_64
if (i->as64L())
RCX -= (wordCount-1);
else
#endif
if (i->as32L())
ECX -= (wordCount-1);
else
CX -= (wordCount-1);
incr = wordCount << 1; // count * 2.
goto doIncr;
}
}
}
}
noAcceleration:
#endif // __i386__
#endif // (BX_DEBUGGER == 0)
#endif // #if BX_SupportRepeatSpeedups
// Write a zero to memory, to trigger any segment or page
// faults before reading from IO port.
write_virtual_word(BX_SEG_REG_ES, edi, &value16);
value16 = BX_INP(DX, 2);
/* no seg override allowed */
write_virtual_word(BX_SEG_REG_ES, edi, &value16);
incr = 2;
}
#if BX_SupportRepeatSpeedups
#if (BX_DEBUGGER == 0)
#if (defined(__i386__) && __i386__)
doIncr:
#endif
#endif
#endif
#if BX_SUPPORT_X86_64
if (i->as64L()) {
if (BX_CPU_THIS_PTR get_DF ())
RDI = RDI - incr;
else
RDI = RDI + incr;
}
else
#endif
if (i->as32L()) {
if (BX_CPU_THIS_PTR get_DF ())
RDI = EDI - incr;
else
RDI = EDI + incr;
}
else {
if (BX_CPU_THIS_PTR get_DF ())
DI = DI - incr;
else
DI = DI + incr;
}
}
void BX_CPU_C::OUTSB_DXXb(bxInstruction_c *i)
{
unsigned seg;
Bit8u value8;
bx_address esi;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR get_VM () || (CPL>BX_CPU_THIS_PTR get_IOPL ()))) {
if ( !BX_CPU_THIS_PTR allow_io(DX, 1) ) {
exception(BX_GP_EXCEPTION, 0, 0);
}
}
if (!BX_NULL_SEG_REG(i->seg())) {
seg = i->seg();
}
else {
seg = BX_SEG_REG_DS;
}
#if BX_SUPPORT_X86_64
if (i->as64L())
esi = RSI;
else
#endif
if (i->as32L())
esi = ESI;
else
esi = SI;
read_virtual_byte(seg, esi, &value8);
BX_OUTP(DX, value8, 1);
#if BX_SUPPORT_X86_64
if (i->as64L()) {
if (BX_CPU_THIS_PTR get_DF ())
RSI--;
else
RSI++;
}
else
#endif
if (i->as32L()) {
if (BX_CPU_THIS_PTR get_DF ())
RSI--;
else
RSI++;
}
else {
if (BX_CPU_THIS_PTR get_DF ())
SI--;
else
SI++;
}
}
// output word/doubleword string to port
void BX_CPU_C::OUTSW_DXXv(bxInstruction_c *i)
{
unsigned seg;
bx_address esi;
unsigned int incr;
if (!BX_NULL_SEG_REG(i->seg())) {
seg = i->seg();
}
else {
seg = BX_SEG_REG_DS;
}
#if BX_SUPPORT_X86_64
if (i->as64L())
esi = RSI;
else
#endif
if (i->as32L())
esi = ESI;
else
esi = SI;
if (i->os32L()) {
Bit32u value32;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR get_VM () || (CPL>BX_CPU_THIS_PTR get_IOPL ()))) {
if ( !BX_CPU_THIS_PTR allow_io(DX, 4) ) {
exception(BX_GP_EXCEPTION, 0, 0);
}
}
read_virtual_dword(seg, esi, &value32);
BX_OUTP(DX, value32, 4);
incr = 4;
}
else {
Bit16u value16;
if (BX_CPU_THIS_PTR cr0.pe && (BX_CPU_THIS_PTR get_VM () || (CPL>BX_CPU_THIS_PTR get_IOPL ()))) {
if ( !BX_CPU_THIS_PTR allow_io(DX, 2) ) {
exception(BX_GP_EXCEPTION, 0, 0);
}
}
#if BX_SupportRepeatSpeedups
#if (BX_DEBUGGER == 0)
#if (defined(__i386__) && __i386__)
/* If conditions are right, we can transfer IO to physical memory
* in a batch, rather than one instruction at a time.
*/
if (i->repUsedL() && !BX_CPU_THIS_PTR async_event) {
Bit32u wordCount;
#if BX_SUPPORT_X86_64
if (i->as64L())
wordCount = RCX; // Truncated to 32bits. (we're only doing 1 page)
else
#endif
if (i->as32L())
wordCount = ECX;
else
wordCount = CX;
if (wordCount) {
bx_address laddrSrc;
Bit32u paddrSrc, wordsFitSrc;
Bit8u *hostAddrSrc;
bx_segment_reg_t *srcSegPtr;
unsigned pointerDelta;
srcSegPtr = &BX_CPU_THIS_PTR sregs[seg];
// Do segment checks for the 1st word. We do not want to
// trip an exception beyond this, because the address would
// be incorrect. After we know how many bytes we will directly
// transfer, we can do the full segment limit check ourselves
// without generating an exception.
read_virtual_checks(srcSegPtr, esi, 2);
laddrSrc = BX_CPU_THIS_PTR get_segment_base(seg) + esi;
if (BX_CPU_THIS_PTR cr0.pg)
paddrSrc = dtranslate_linear(laddrSrc, CPL==3, BX_READ);
else
paddrSrc = laddrSrc;
// If we want to write directly into the physical memory array,
// we need the A20 address.
paddrSrc = A20ADDR(paddrSrc);
hostAddrSrc = BX_CPU_THIS_PTR mem->getHostMemAddr(BX_CPU_THIS,
paddrSrc, BX_READ);
// Check that native host access was not vetoed for that page, and
// that the address is word aligned.
if ( hostAddrSrc && ! (paddrSrc & 1) ) {
// See how many words can fit in the rest of this page.
if (BX_CPU_THIS_PTR get_DF ()) {
// Counting downward.
// Note: 1st word must not cross page boundary.
if ( (paddrSrc & 0xfff) > 0xffe )
goto noAcceleration;
wordsFitSrc = (2 + (paddrSrc & 0xfff)) >> 1;
pointerDelta = (unsigned) -2;
}
else {
// Counting upward.
wordsFitSrc = (0x1000 - (paddrSrc & 0xfff)) >> 1;
pointerDelta = 2;
}
// Restrict word count to the number that will fit in this page.
if (wordCount > wordsFitSrc)
wordCount = wordsFitSrc;
// If after all the restrictions, there is anything left to do...
if (wordCount) {
unsigned j;
Bit32u srcSegLimit;
srcSegLimit = srcSegPtr->cache.u.segment.limit_scaled;
// For 16-bit addressing mode, clamp the segment limits to 16bits
// so we don't have to worry about computations using si/di
// rolling over 16-bit boundaries.
if (!i->as32L()) {
if (srcSegLimit > 0xffff)
srcSegLimit = 0xffff;
}
// Before we copy memory, we need to make sure that the segments
// allow the accesses up to the given source and dest offset. If
// the cache.valid bits have SegAccessWOK and ROK, we know that
// the cache is valid for those operations, and that the segments
// are non-expand down (thus we can make a simple limit check).
if ( !(srcSegPtr->cache.valid & SegAccessROK) ) {
goto noAcceleration;
}
if (BX_CPU_THIS_PTR cpu_mode != BX_MODE_LONG_64) {
// Now make sure transfer will fit within the constraints of the
// segment boundaries, 0..limit for non expand-down. We know
// wordCount >= 1 here.
if (BX_CPU_THIS_PTR get_DF ()) {
// Counting downward.
Bit32u minOffset = (wordCount-1) << 1;
if ( esi < minOffset )
goto noAcceleration;
}
else {
// Counting upward.
Bit32u srcMaxOffset = (srcSegLimit - (wordCount<<1)) + 1;
if ( esi > srcMaxOffset )
goto noAcceleration;
}
}
for (j=0; j<wordCount; ) {
Bit16u temp16;
bx_devices.bulkIOQuantumsTransferred = 0;
if ( BX_CPU_THIS_PTR get_DF ()==0 ) { // Only do accel for DF=0
bx_devices.bulkIOHostAddr = hostAddrSrc;
bx_devices.bulkIOQuantumsRequested = (wordCount - j);
}
else
bx_devices.bulkIOQuantumsRequested = 0;
temp16 = * (Bit16u *) hostAddrSrc;
BX_OUTP(DX, temp16, 2);
if ( bx_devices.bulkIOQuantumsTransferred ) {
hostAddrSrc = bx_devices.bulkIOHostAddr;
j += bx_devices.bulkIOQuantumsTransferred;
}
else {
hostAddrSrc += pointerDelta;
j++;
}
// Terminate early if there was an event.
if ( BX_CPU_THIS_PTR async_event )
break;
}
// Reset for next non-bulk IO.
bx_devices.bulkIOQuantumsRequested = 0;
wordCount = j;
// Decrement eCX. Note, the main loop will decrement 1 also, so
// decrement by one less than expected, like the case above.
BX_TICKN(j-1); // Main cpu loop also decrements one more.
#if BX_SUPPORT_X86_64
if (i->as64L())
RCX -= (wordCount-1);
else
#endif
if (i->as32L())
ECX -= (wordCount-1);
else
CX -= (wordCount-1);
incr = wordCount << 1; // count * 2.
goto doIncr;
}
}
}
}
noAcceleration:
#endif // __i386__
#endif // (BX_DEBUGGER == 0)
#endif // #if BX_SupportRepeatSpeedups
read_virtual_word(seg, esi, &value16);
BX_OUTP(DX, value16, 2);
incr = 2;
}
#if BX_SupportRepeatSpeedups
#if (BX_DEBUGGER == 0)
#if (defined(__i386__) && __i386__)
doIncr:
#endif
#endif
#endif
#if BX_SUPPORT_X86_64
if (i->as64L()) {
if (BX_CPU_THIS_PTR get_DF ())
RSI = RSI - incr;
else
RSI = RSI + incr;
}
else
#endif
if (i->as32L()) {
if (BX_CPU_THIS_PTR get_DF ())
RSI = ESI - incr;
else
RSI = ESI + incr;
}
else {
if (BX_CPU_THIS_PTR get_DF ())
SI = SI - incr;
else
SI = SI + incr;
}
}
void BX_CPU_C::IN_ALIb(bxInstruction_c *i)
{
AL = BX_CPU_THIS_PTR inp8(i->Ib());
}
void BX_CPU_C::IN_eAXIb(bxInstruction_c *i)
{
#if BX_CPU_LEVEL > 2
if (i->os32L()) {
Bit32u eax = BX_CPU_THIS_PTR inp32(i->Ib());
RAX = eax;
}
else
#endif /* BX_CPU_LEVEL > 2 */
{
AX = BX_CPU_THIS_PTR inp16(i->Ib());
}
}
void BX_CPU_C::OUT_IbAL(bxInstruction_c *i)
{
BX_CPU_THIS_PTR outp8(i->Ib(), AL);
}
void BX_CPU_C::OUT_IbeAX(bxInstruction_c *i)
{
#if BX_CPU_LEVEL > 2
if (i->os32L()) {
BX_CPU_THIS_PTR outp32(i->Ib(), EAX);
}
else
#endif /* BX_CPU_LEVEL > 2 */
{
BX_CPU_THIS_PTR outp16(i->Ib(), AX);
}
}
void BX_CPU_C::IN_ALDX(bxInstruction_c *i)
{
AL = BX_CPU_THIS_PTR inp8(DX);
}
void BX_CPU_C::IN_eAXDX(bxInstruction_c *i)
{
#if BX_CPU_LEVEL > 2
if (i->os32L()) {
Bit32u eax = BX_CPU_THIS_PTR inp32(DX);
RAX = eax;
}
else
#endif /* BX_CPU_LEVEL > 2 */
{
AX = BX_CPU_THIS_PTR inp16(DX);
}
}
void BX_CPU_C::OUT_DXAL(bxInstruction_c *i)
{
BX_CPU_THIS_PTR outp8(DX, AL);
}
void BX_CPU_C::OUT_DXeAX(bxInstruction_c *i)
{
#if BX_CPU_LEVEL > 2
if (i->os32L()) {
BX_CPU_THIS_PTR outp32(DX, EAX);
}
else
#endif /* BX_CPU_LEVEL > 2 */
{
BX_CPU_THIS_PTR outp16(DX, AX);
}
}
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