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Bochs/bochs/memory/memory.cc

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// 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
#include "bochs.h"
#if BX_PROVIDE_CPU_MEMORY
void
BX_MEM_C::write_physical(Bit32u addr, unsigned len, void *data)
{
Bit8u *data_ptr;
Bit32u a20addr;
a20addr = A20ADDR(addr);
BX_INSTR_PHY_WRITE(a20addr, len);
#if BX_DEBUGGER
// (mch) Check for physical write break points, TODO
for (int i = 0; i < num_write_watchpoints; i++)
if (write_watchpoint[i] == a20addr) {
BX_CPU_THIS_PTR break_point = BREAK_POINT_WRITE;
break;
}
#endif
if ( (a20addr + len) <= BX_MEM_THIS len ) {
// all of data is within limits of physical memory
if ( (a20addr & 0xfff80000) != 0x00080000 ) {
if (len == 4) {
if ((a20addr & 0x00000003) == 0) {
// write 4byte data to aligned memory location
Bit32u data32;
data32 = * (Bit32u *) data;
#ifdef BX_BIG_ENDIAN
data32 = (data32 << 24) | (data32 >> 24) |
((data32&0x00ff0000)>>8) | ((data32&0x0000ff00)<<8);
#endif
* ((Bit32u *) (&BX_MEM.vector[a20addr])) = data32;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
return;
}
else {
Bit32u data32;
data32 = * (Bit32u *) data;
* ((Bit8u *) (&BX_MEM.vector[a20addr])) = data32; data32 >>= 8;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
* ((Bit8u *) (&BX_MEM.vector[A20ADDR(addr+1)])) = data32; data32 >>= 8;
* ((Bit8u *) (&BX_MEM.vector[A20ADDR(addr+2)])) = data32; data32 >>= 8;
* ((Bit8u *) (&BX_MEM.vector[A20ADDR(addr+3)])) = data32;
// worst case, last byte is in different page; possible extra dirty page
BX_DBG_DIRTY_PAGE(A20ADDR(addr+3) >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
return;
}
}
if (len == 2) {
if ((a20addr & 0x00000001) == 0) {
// write 2-byte data to aligned memory location
Bit16u data16;
data16 = * (Bit16u *) data;
#ifdef BX_BIG_ENDIAN
data16 = (data16 >> 8) | (data16 << 8);
#endif
* ((Bit16u *) (&BX_MEM.vector[a20addr])) = data16;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
return;
}
else {
Bit16u data16;
data16 = * (Bit16u *) data;
* ((Bit8u *) (&BX_MEM.vector[a20addr])) = (Bit8u) data16;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
* ((Bit8u *) (&BX_MEM.vector[A20ADDR(a20addr+1)])) = (data16 >> 8);
BX_DBG_DIRTY_PAGE(A20ADDR(a20addr+1) >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
return;
}
}
if (len == 1) {
Bit8u data8;
data8 = * (Bit8u *) data;
* ((Bit8u *) (&BX_MEM.vector[a20addr])) = data8;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
return;
}
// len == 3 case can just fall thru to special cases handling
}
#ifdef BX_LITTLE_ENDIAN
data_ptr = (Bit8u *) data;
#else // BX_BIG_ENDIAN
data_ptr = (Bit8u *) data + (len - 1);
#endif
write_one:
if ( (a20addr & 0xfff80000) != 0x00080000 ) {
// addr *not* in range 00080000 .. 000FFFFF
BX_MEM.vector[a20addr] = *data_ptr;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
inc_one:
if (len == 1) return;
len--;
addr++;
a20addr = A20ADDR(addr);
#ifdef BX_LITTLE_ENDIAN
data_ptr++;
#else // BX_BIG_ENDIAN
data_ptr--;
#endif
goto write_one;
}
// addr in range 00080000 .. 000FFFFF
if (a20addr <= 0x0009ffff) {
// regular memory 80000 .. 9FFFF
BX_MEM.vector[a20addr] = *data_ptr;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
goto inc_one;
}
if (a20addr <= 0x000bffff) {
// VGA memory A0000 .. BFFFF
BX_VGA_MEM_WRITE(a20addr, *data_ptr);
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
BX_DBG_UCMEM_REPORT(a20addr, 1, BX_WRITE, *data_ptr); // obsolete
goto inc_one;
}
// adapter ROM C0000 .. DFFFF
// ROM BIOS memory E0000 .. FFFFF
// (ignore write)
//bx_printf("ROM lock %08x: len=%u\n",
// (unsigned) a20addr, (unsigned) len);
#if BX_PCI_SUPPORT == 0
#if BX_SHADOW_RAM
// Write it since its in shadow RAM
BX_MEM.vector[a20addr] = *data_ptr;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
#else
// ignore write to ROM
#endif
#else
// Write Based on 440fx Programming
if (bx_options.i440FXSupport &&
((a20addr >= 0xC0000) && (a20addr <= 0xFFFFF))) {
switch (bx_pci.wr_memType(a20addr & 0xFC000)) {
case 0x0: // Writes to ShadowRAM
// bx_printf ("Writing to ShadowRAM %08x, len %u ! \n", (unsigned) a20addr, (unsigned) len);
BX_MEM.vector[a20addr] = *data_ptr;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
goto inc_one;
case 0x1: // Writes to ROM, Inhibit
// bx_pci.s.i440fx.shadow[(a20addr - 0xc0000)] = *data_ptr;
// bx_printf ("Writing to ROM %08x, Data %02x ! \n", (unsigned) a20addr, *data_ptr);
goto inc_one;
default:
bx_panic("write_physical: default case\n");
goto inc_one;
}
}
#endif
goto inc_one;
}
else {
// some or all of data is outside limits of physical memory
unsigned i;
#ifdef BX_LITTLE_ENDIAN
data_ptr = (Bit8u *) data;
#else // BX_BIG_ENDIAN
data_ptr = (Bit8u *) data + (len - 1);
#endif
for (i = 0; i < len; i++) {
if (a20addr < BX_MEM_THIS len) {
BX_MEM.vector[a20addr] = *data_ptr;
BX_DBG_DIRTY_PAGE(a20addr >> 12);
BX_DYN_DIRTY_PAGE(a20addr >> 12);
}
// otherwise ignore byte, since it overruns memory
addr++;
a20addr = A20ADDR(addr);
#ifdef BX_LITTLE_ENDIAN
data_ptr++;
#else // BX_BIG_ENDIAN
data_ptr--;
#endif
}
return;
}
}
void
BX_MEM_C::read_physical(Bit32u addr, unsigned len, void *data)
{
Bit8u *data_ptr;
Bit32u a20addr;
a20addr = A20ADDR(addr);
BX_INSTR_PHY_READ(a20addr, len);
#if BX_DEBUGGER
// (mch) Check for physical read break points, TODO
for (int i = 0; i < num_read_watchpoints; i++)
if (read_watchpoint[i] == a20addr) {
BX_CPU_THIS_PTR break_point = BREAK_POINT_READ;
break;
}
#endif
if ( (a20addr + len) <= BX_MEM_THIS len ) {
// all of data is within limits of physical memory
if ( (a20addr & 0xfff80000) != 0x00080000 ) {
if (len == 4) {
if ((a20addr & 0x00000003) == 0) {
// read 4-byte data from aligned memory location
Bit32u data32;
data32 = * ((Bit32u *) (&BX_MEM.vector[a20addr]));
#ifdef BX_BIG_ENDIAN
data32 = (data32 << 24) | (data32 >> 24) |
((data32&0x00ff0000)>>8) | ((data32&0x0000ff00)<<8);
#endif
* (Bit32u *) data = data32;
return;
}
else {
Bit32u data32;
data32 = * ((Bit8u *) (&BX_MEM.vector[A20ADDR(addr+3)])); data32 <<= 8;
data32 |= * ((Bit8u *) (&BX_MEM.vector[A20ADDR(addr+2)])); data32 <<= 8;
data32 |= * ((Bit8u *) (&BX_MEM.vector[A20ADDR(addr+1)])); data32 <<= 8;
data32 |= * ((Bit8u *) (&BX_MEM.vector[a20addr]));
* (Bit32u *) data = data32;
return;
}
}
if (len == 2) {
if ((a20addr & 0x00000001) == 0) {
// read 2-byte data from aligned memory location
Bit16u data16;
data16 = * ((Bit16u *) (&BX_MEM.vector[a20addr]));
#ifdef BX_BIG_ENDIAN
data16 = (data16 >> 8) | (data16 << 8);
#endif
* (Bit16u *) data = data16;
return;
}
else {
Bit16u data16;
data16 = * ((Bit8u *) (&BX_MEM.vector[A20ADDR(addr+1)])); data16 <<= 8;
data16 |= * ((Bit8u *) (&BX_MEM.vector[a20addr]));
* (Bit16u *) data = data16;
return;
}
}
if (len == 1) {
Bit8u data8;
data8 = * ((Bit8u *) (&BX_MEM.vector[a20addr]));
* (Bit8u *) data = data8;
return;
}
// len == 3 case can just fall thru to special cases handling
}
#ifdef BX_LITTLE_ENDIAN
data_ptr = (Bit8u *) data;
#else // BX_BIG_ENDIAN
data_ptr = (Bit8u *) data + (len - 1);
#endif
read_one:
if ( (a20addr & 0xfff80000) != 0x00080000 ) {
// addr *not* in range 00080000 .. 000FFFFF
*data_ptr = BX_MEM.vector[a20addr];
inc_one:
if (len == 1) return;
len--;
addr++;
a20addr = A20ADDR(addr);
#ifdef BX_LITTLE_ENDIAN
data_ptr++;
#else // BX_BIG_ENDIAN
data_ptr--;
#endif
goto read_one;
}
// addr in range 00080000 .. 000FFFFF
#if BX_PCI_SUPPORT == 0
if ((a20addr <= 0x0009ffff) || (a20addr >= 0x000c0000) ) {
// regular memory 80000 .. 9FFFF, C0000 .. F0000
*data_ptr = BX_MEM.vector[a20addr];
goto inc_one;
}
// VGA memory A0000 .. BFFFF
*data_ptr = BX_VGA_MEM_READ(a20addr);
BX_DBG_UCMEM_REPORT(a20addr, 1, BX_READ, *data_ptr); // obsolete
goto inc_one;
#else // #if BX_PCI_SUPPORT == 0
if (a20addr <= 0x0009ffff) {
*data_ptr = BX_MEM.vector[a20addr];
goto inc_one;
}
if (a20addr <= 0x000BFFFF) {
// VGA memory A0000 .. BFFFF
*data_ptr = BX_VGA_MEM_READ(a20addr);
BX_DBG_UCMEM_REPORT(a20addr, 1, BX_READ, *data_ptr);
goto inc_one;
}
// a20addr in C0000 .. FFFFF
if (!bx_options.i440FXSupport) {
*data_ptr = BX_MEM.vector[a20addr];
goto inc_one;
}
else {
switch (bx_pci.rd_memType(a20addr & 0xFC000)) {
case 0x0: // Read from ShadowRAM
*data_ptr = BX_MEM.vector[a20addr];
bx_printf ("Reading from ShadowRAM %08x, Data %02x \n", (unsigned) a20addr, *data_ptr);
goto inc_one;
case 0x1: // Read from ROM
*data_ptr = bx_pci.s.i440fx.shadow[(a20addr - 0xc0000)];
//bx_printf ("Reading from ROM %08x, Data %02x \n", (unsigned) a20addr, *data_ptr);
goto inc_one;
default:
bx_panic("::read_physical: default case\n");
}
}
goto inc_one;
#endif // #if BX_PCI_SUPPORT == 0
}
else {
// some or all of data is outside limits of physical memory
unsigned i;
#ifdef BX_LITTLE_ENDIAN
data_ptr = (Bit8u *) data;
#else // BX_BIG_ENDIAN
data_ptr = (Bit8u *) data + (len - 1);
#endif
for (i = 0; i < len; i++) {
#if BX_PCI_SUPPORT == 0
if (a20addr < BX_MEM_THIS len)
*data_ptr = BX_MEM.vector[a20addr];
else
*data_ptr = 0xff;
#else // BX_PCI_SUPPORT == 0
if (a20addr < BX_MEM_THIS len) {
if ((a20addr >= 0x000C0000) && (a20addr <= 0x000FFFFF)) {
if (!bx_options.i440FXSupport)
*data_ptr = BX_MEM.vector[a20addr];
else {
switch (bx_pci.rd_memType(a20addr & 0xFC000)) {
case 0x0: // Read from ROM
*data_ptr = BX_MEM.vector[a20addr];
//bx_printf ("Reading from ROM %08x, Data %02x \n", (unsigned) a20addr, *data_ptr);
break;
case 0x1: // Read from Shadow RAM
*data_ptr = bx_pci.s.i440fx.shadow[(a20addr - 0xc0000)];
bx_printf ("Reading from ShadowRAM %08x, Data %02x \n", (unsigned) a20addr, *data_ptr);
break;
default:
bx_panic("read_physical: default case\n");
} // Switch
}
}
else {
*data_ptr = BX_MEM.vector[a20addr];
bx_printf ("Reading from Norm %08x, Data %02x \n", (unsigned) a20addr, *data_ptr);
}
}
else
*data_ptr = 0xff;
#endif // BX_PCI_SUPPORT == 0
addr++;
a20addr = A20ADDR(addr);
#ifdef BX_LITTLE_ENDIAN
data_ptr++;
#else // BX_BIG_ENDIAN
data_ptr--;
#endif
}
return;
}
}
#endif // #if BX_PROVIDE_CPU_MEMORY
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