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Bochs/bochs/iodev/cmos.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"
#define LOG_THIS bx_cmos.
bx_cmos_c bx_cmos;
#if BX_USE_CMOS_SMF
#define this (&bx_cmos)
#endif
// check that BX_NUM_CMOS_REGS is 64 or 128
#if (BX_NUM_CMOS_REGS == 64)
#elif (BX_NUM_CMOS_REGS == 128)
#else
#error "Invalid BX_NUM_CMOS_REGS value in config.h"
#endif
bx_cmos_c::bx_cmos_c(void)
{
setprefix("CMOS");
settype(CMOSLOG);
BX_DEBUG(("Init."));
}
bx_cmos_c::~bx_cmos_c(void)
{
// nothing for now
BX_DEBUG(("Exit."));
}
void
bx_cmos_c::init(bx_devices_c *d)
{
unsigned i;
// CMOS RAM & RTC
BX_CMOS_THIS devices = d;
BX_CMOS_THIS devices->register_io_read_handler(this,
read_handler, 0x0070,
"CMOS RAM");
BX_CMOS_THIS devices->register_io_read_handler(this,
read_handler,
0x0071,
"CMOS RAM");
BX_CMOS_THIS devices->register_io_write_handler(this,
write_handler,
0x0070, "CMOS RAM");
BX_CMOS_THIS devices->register_io_write_handler(this,
write_handler,
0x0071, "CMOS RAM");
BX_CMOS_THIS devices->register_irq(8, "CMOS RTC");
BX_CMOS_THIS s.periodic_timer_index =
bx_pc_system.register_timer(this, periodic_timer_handler,
1000000, 1,0); // continuous, not-active
BX_CMOS_THIS s.one_second_timer_index =
bx_pc_system.register_timer(this, one_second_timer_handler,
1000000, 1,0); // continuous, not-active
for (i=0; i<BX_NUM_CMOS_REGS; i++) {
BX_CMOS_THIS s.reg[i] = 0;
}
#if BX_USE_SPECIFIED_TIME0 == 0
// ??? this will not be correct for using an image file.
// perhaps take values in CMOS and work backwards to find
// s.timeval from values read in.
BX_CMOS_THIS s.timeval = time(NULL);
#else
BX_CMOS_THIS s.timeval = BX_USE_SPECIFIED_TIME0;
#endif
if (bx_options.cmos.time0 == 1)
BX_CMOS_THIS s.timeval = time(NULL);
else if (bx_options.cmos.time0 != 0)
BX_CMOS_THIS s.timeval = bx_options.cmos.time0;
char *tmptime;
while( (tmptime = strdup(ctime(&(BX_CMOS_THIS s.timeval)))) == NULL) {
BX_PANIC(("Out of memory."));
}
tmptime[strlen(tmptime)-1]='\0';
BX_INFO(("Setting initial clock to: %s", tmptime));
update_clock();
// load CMOS from image file if requested.
if (bx_options.cmos.cmosImage) {
// CMOS image file requested
int fd, ret;
struct stat stat_buf;
fd = open(bx_options.cmos.path, O_RDONLY
#ifdef O_BINARY
| O_BINARY
#endif
);
if (fd < 0) {
BX_PANIC(("trying to open cmos image file '%s'",
bx_options.cmos.path));
}
ret = fstat(fd, &stat_buf);
if (ret) {
BX_PANIC(("CMOS: could not fstat() image file."));
}
if (stat_buf.st_size != BX_NUM_CMOS_REGS) {
BX_PANIC(("CMOS: image file not same size as BX_NUM_CMOS_REGS."));
}
ret = ::read(fd, (bx_ptr_t) BX_CMOS_THIS s.reg, BX_NUM_CMOS_REGS);
if (ret != BX_NUM_CMOS_REGS) {
BX_PANIC(("CMOS: error reading cmos file."));
}
close(fd);
BX_INFO(("successfuly read from image file '%s'.",
bx_options.cmos.path));
}
else {
// CMOS values generated
BX_CMOS_THIS s.reg[0x0a] = 0x26;
BX_CMOS_THIS s.reg[0x0b] = 0x02;
BX_CMOS_THIS s.reg[0x0c] = 0x00;
BX_CMOS_THIS s.reg[0x0d] = 0x80;
}
}
void
bx_cmos_c::reset(void)
{
BX_CMOS_THIS s.cmos_mem_address = 0;
// RESET affects the following registers:
// CRA: no effects
// CRB: bits 4,5,6 forced to 0
// CRC: bits 4,5,6,7 forced to 0
// CRD: no effects
BX_CMOS_THIS s.reg[0x0b] &= 0x8f;
BX_CMOS_THIS s.reg[0x0c] = 0;
// One second timer for updating clock & alarm functions
bx_pc_system.activate_timer(BX_CMOS_THIS s.one_second_timer_index,
1000000, 1);
// handle periodic interrupt rate select
BX_CMOS_THIS CRA_change();
}
void
bx_cmos_c::CRA_change(void)
{
unsigned nibble;
// Periodic Interrupt timer
nibble = BX_CMOS_THIS s.reg[0x0a] & 0x0f;
if (nibble == 0) {
// No Periodic Interrupt Rate when 0, deactivate timer
bx_pc_system.deactivate_timer(BX_CMOS_THIS s.periodic_timer_index);
BX_CMOS_THIS s.periodic_interval_usec = (Bit32u) -1; // max value
}
else {
// values 0001b and 0010b are the same as 1000b and 1001b
if (nibble <= 2)
nibble += 7;
BX_CMOS_THIS s.periodic_interval_usec = (unsigned) (1000000.0L /
(32768.0L / (1 << (nibble - 1))));
// if Periodic Interrupt Enable bit set, activate timer
if ( BX_CMOS_THIS s.reg[0x0b] & 0x40 )
bx_pc_system.activate_timer(BX_CMOS_THIS s.periodic_timer_index,
BX_CMOS_THIS s.periodic_interval_usec, 1);
else
bx_pc_system.deactivate_timer(BX_CMOS_THIS s.periodic_timer_index);
}
}
// static IO port read callback handler
// redirects to non-static class handler to avoid virtual functions
Bit32u
bx_cmos_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
{
#if !BX_USE_CMOS_SMF
bx_cmos_c *class_ptr = (bx_cmos_c *) this_ptr;
return( class_ptr->read(address, io_len) );
}
Bit32u
bx_cmos_c::read(Bit32u address, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif
Bit8u ret8;
if (io_len > 1)
BX_PANIC(("io read from address %08x len=%u",
(unsigned) address, (unsigned) io_len));
if (bx_dbg.cmos)
BX_INFO(("CMOS read of CMOS register 0x%x",
(unsigned) BX_CMOS_THIS s.cmos_mem_address));
switch (address) {
case 0x0071:
if (BX_CMOS_THIS s.cmos_mem_address >= BX_NUM_CMOS_REGS) {
BX_PANIC(("unsupported cmos io read, register(0x%02x)!",
(unsigned) BX_CMOS_THIS s.cmos_mem_address));
}
ret8 = BX_CMOS_THIS s.reg[BX_CMOS_THIS s.cmos_mem_address];
// all bits of Register C are cleared after a read occurs.
if (BX_CMOS_THIS s.cmos_mem_address == 0x0c)
BX_CMOS_THIS s.reg[0x0c] = 0x00;
return(ret8);
break;
default:
BX_PANIC(("unsupported cmos read, address=%0x%x!",
(unsigned) address));
return(0);
break;
}
}
// static IO port write callback handler
// redirects to non-static class handler to avoid virtual functions
void
bx_cmos_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
#if !BX_USE_CMOS_SMF
bx_cmos_c *class_ptr = (bx_cmos_c *) this_ptr;
class_ptr->write(address, value, io_len);
}
void
bx_cmos_c::write(Bit32u address, Bit32u value, unsigned io_len)
{
#else
UNUSED(this_ptr);
#endif // !BX_USE_CMOS_SMF
if (io_len > 1)
BX_PANIC(("io write to address %08x len=%u",
(unsigned) address, (unsigned) io_len));
if (bx_dbg.cmos)
BX_INFO(("CMOS write to address: 0x%x = 0x%x",
(unsigned) address, (unsigned) value));
switch (address) {
case 0x0070:
#if (BX_NUM_CMOS_REGS == 64)
BX_CMOS_THIS s.cmos_mem_address = value & 0x3F;
#else
BX_CMOS_THIS s.cmos_mem_address = value & 0x7F;
#endif
break;
case 0x0071:
if (BX_CMOS_THIS s.cmos_mem_address >= BX_NUM_CMOS_REGS) {
BX_PANIC(("unsupported cmos io write, register(0x%02x)=%02x!",
(unsigned) BX_CMOS_THIS s.cmos_mem_address, (unsigned) value));
return;
}
switch (BX_CMOS_THIS s.cmos_mem_address) {
case 0x00: // seconds
case 0x01: // seconds alarm
case 0x02: // minutes
case 0x03: // minutes alarm
case 0x04: // hours
case 0x05: // hours alarm
case 0x06: // day of the week
case 0x07: // day of the month
case 0x08: // month
case 0x09: // year
//BX_INFO(("write reg %02xh: value = %02xh",
// (unsigned) BX_CMOS_THIS s.cmos_mem_address, (unsigned) value);
BX_CMOS_THIS s.reg[BX_CMOS_THIS s.cmos_mem_address] = value;
return;
break;
case 0x0a: // Control Register A
// bit 7: Update in Progress (read-only)
// 1 = signifies time registers will be updated within 244us
// 0 = time registers will not occur before 244us
// note: this bit reads 0 when CRB bit 7 is 1
// bit 6..4: Divider Chain Control
// 000 oscillator disabled
// 001 oscillator disabled
// 010 Normal operation
// 011 TEST
// 100 TEST
// 101 TEST
// 110 Divider Chain RESET
// 111 Divider Chain RESET
// bit 3..0: Periodic Interrupt Rate Select
// 0000 None
// 0001 3.90625 ms
// 0010 7.8125 ms
// 0011 122.070 us
// 0100 244.141 us
// 0101 488.281 us
// 0110 976.562 us
// 0111 1.953125 ms
// 1000 3.90625 ms
// 1001 7.8125 ms
// 1010 15.625 ms
// 1011 31.25 ms
// 1100 62.5 ms
// 1101 125 ms
// 1110 250 ms
// 1111 500 ms
unsigned dcc;
dcc = (value >> 4) & 0x07;
if (dcc != 0x02) {
BX_PANIC(("CRA: divider chain control 0x%x", dcc));
}
BX_CMOS_THIS s.reg[0x0a] = value & 0x7f;
BX_CMOS_THIS CRA_change();
return;
break;
case 0x0b: // Control Register B
// bit 0: Daylight Savings Enable
// 1 = enable daylight savings
// 0 = disable daylight savings
// bit 1: 24/12 houre mode
// 1 = 24 hour format
// 0 = 12 hour format
// bit 2: Data Mode
// 1 = binary format
// 0 = BCD format
// bit 3: "square wave enable"
// Not supported and always read as 0
// bit 4: Update Ended Interrupt Enable
// 1 = enable generation of update ended interrupt
// 0 = disable
// bit 5: Alarm Interrupt Enable
// 1 = enable generation of alarm interrupt
// 0 = disable
// bit 6: Periodic Interrupt Enable
// 1 = enable generation of periodic interrupt
// 0 = disable
// bit 7: Set mode
// 1 = user copy of time is "frozen" allowing time registers
// to be accessed without regard for an occurance of an update
// 0 = time updates occur normally
// can not handle binary or 12-hour mode yet.
if (value & 0x04)
BX_PANIC(("write status reg B, binary format enabled."));
if ( !(value & 0x02) )
BX_PANIC(("write status reg B, 12 hour mode enabled."));
value &= 0xf7; // bit3 always 0
// Note: setting bit 7 clears bit 4
if (value & 0x80)
value &= 0xef;
unsigned prev_CRB;
prev_CRB = BX_CMOS_THIS s.reg[0x0b];
BX_CMOS_THIS s.reg[0x0b] = value;
if ( (prev_CRB & 0x40) != (value & 0x40) ) {
// Periodic Interrupt Enabled changed
if (prev_CRB & 0x40) {
// transition from 1 to 0, deactivate timer
bx_pc_system.deactivate_timer(
BX_CMOS_THIS s.periodic_timer_index);
}
else {
// transition from 0 to 1
// if rate select is not 0, activate timer
if ( (BX_CMOS_THIS s.reg[0x0a] & 0x0f) != 0 ) {
bx_pc_system.activate_timer(
BX_CMOS_THIS s.periodic_timer_index,
BX_CMOS_THIS s.periodic_interval_usec, 1);
}
}
}
return;
break;
case 0x0c: // Control Register C
case 0x0d: // Control Register D
BX_ERROR(("write to control register 0x%x (read-only)",
BX_CMOS_THIS s.cmos_mem_address));
break;
case 0x0e: // diagnostic status
BX_DEBUG(("write register 0Eh: %02x", (unsigned) value));;
break;
case 0x0f: // shutdown status
switch (value) {
case 0x00: /* proceed with normal POST (soft reset) */
BX_DEBUG(("Reg 0F set to 0: shutdown action = normal POST"));;
break;
case 0x02: /* shutdown after memory test */
BX_DEBUG(("Reg 0Fh: request to change shutdown action"
" to shutdown after memory test"));
break;
case 0x03:
BX_DEBUG(("Reg 0Fh(03) : Shutdown after memory test !"));;
break;
case 0x04: /* jump to disk bootstrap routine */
BX_DEBUG(("Reg 0Fh: request to change shutdown action "
"to jump to disk bootstrap routine."));
break;
case 0x06:
BX_DEBUG(("Reg 0Fh(06) : Shutdown after memory test !"));;
break;
case 0x09: /* return to BIOS extended memory block move
(interrupt 15h, func 87h was in progress) */
BX_DEBUG(("Reg 0Fh: request to change shutdown action "
"to return to BIOS extended memory block move."));
break;
case 0x0a: /* jump to DWORD pointer at 40:67 */
BX_DEBUG(("Reg 0Fh: request to change shutdown action"
" to jump to DWORD at 40:67"));
break;
default:
BX_PANIC(("unsupported cmos io write to reg F, case %x!",
(unsigned) value));
break;
}
break;
default:
BX_DEBUG(("write reg %02xh: value = %02xh",
(unsigned) BX_CMOS_THIS s.cmos_mem_address, (unsigned) value));
break;
}
BX_CMOS_THIS s.reg[BX_CMOS_THIS s.cmos_mem_address] = value;
break;
}
}
void
bx_cmos_c::checksum_cmos(void)
{
unsigned i;
Bit16u sum;
sum = 0;
for (i=0x10; i<=0x2d; i++) {
sum += BX_CMOS_THIS s.reg[i];
}
BX_CMOS_THIS s.reg[0x2e] = (sum >> 8) & 0xff; /* checksum high */
BX_CMOS_THIS s.reg[0x2f] = (sum & 0xff); /* checksum low */
}
void
bx_cmos_c::periodic_timer_handler(void *this_ptr)
{
bx_cmos_c *class_ptr = (bx_cmos_c *) this_ptr;
// if periodic interrupts are enabled, trip IRQ 8, and
// update status register C
if (class_ptr->s.reg[0x0b] & 0x40) {
class_ptr->s.reg[0x0c] |= 0xc0; // Interrupt Request, Periodic Int
class_ptr->devices->pic->trigger_irq(8);
}
}
void
bx_cmos_c::one_second_timer_handler(void *this_ptr)
{
bx_cmos_c *class_ptr = (bx_cmos_c *) this_ptr;
// update internal time/date buffer
class_ptr->s.timeval++;
// Dont update CMOS user copy of time/date if CRB bit7 is 1
// Nothing else do to
if (class_ptr->s.reg[0x0b] & 0x80)
return;
class_ptr->update_clock();
// if update interrupts are enabled, trip IRQ 8, and
// update status register C
if (class_ptr->s.reg[0x0b] & 0x10) {
class_ptr->s.reg[0x0c] |= 0x90; // Interrupt Request, Update Ended
class_ptr->devices->pic->trigger_irq(8);
}
// compare CMOS user copy of time/date to alarm time/date here
if (class_ptr->s.reg[0x0b] & 0x20) {
// Alarm interrupts enabled
Boolean alarm_match = 1;
if ( (class_ptr->s.reg[0x01] & 0xc0) != 0xc0 ) {
// seconds alarm not in dont care mode
if (class_ptr->s.reg[0x00] != class_ptr->s.reg[0x01])
alarm_match = 0;
}
if ( (class_ptr->s.reg[0x03] & 0xc0) != 0xc0 ) {
// minutes alarm not in dont care mode
if (class_ptr->s.reg[0x02] != class_ptr->s.reg[0x03])
alarm_match = 0;
}
if ( (class_ptr->s.reg[0x05] & 0xc0) != 0xc0 ) {
// hours alarm not in dont care mode
if (class_ptr->s.reg[0x04] != class_ptr->s.reg[0x05])
alarm_match = 0;
}
if (alarm_match) {
class_ptr->s.reg[0x0c] |= 0xa0; // Interrupt Request, Alarm Int
class_ptr->devices->pic->trigger_irq(8);
}
}
}
void
bx_cmos_c::update_clock()
{
struct tm *time_calendar;
unsigned year, month, day, century;
Bit8u val_bcd;
time_calendar = localtime(& BX_CMOS_THIS s.timeval);
// update seconds
val_bcd =
((time_calendar->tm_sec / 10) << 4) |
(time_calendar->tm_sec % 10);
BX_CMOS_THIS s.reg[0x00] = val_bcd;
// update minutes
val_bcd =
((time_calendar->tm_min / 10) << 4) |
(time_calendar->tm_min % 10);
BX_CMOS_THIS s.reg[0x02] = val_bcd;
// update hours
val_bcd =
((time_calendar->tm_hour / 10) << 4) |
(time_calendar->tm_hour % 10);
BX_CMOS_THIS s.reg[0x04] = val_bcd;
// update day of the week
day = time_calendar->tm_wday + 1; // 0..6 to 1..7
BX_CMOS_THIS s.reg[0x06] = ((day / 10) << 4) | (day % 10);
// update day of the month
day = time_calendar->tm_mday;
BX_CMOS_THIS s.reg[0x07] = ((day / 10) << 4) | (day % 10);
// update month
month = time_calendar->tm_mon + 1;
BX_CMOS_THIS s.reg[0x08] = ((month / 10) << 4) | (month % 10);
// update year
year = time_calendar->tm_year % 100;
BX_CMOS_THIS s.reg[0x09] = ((year / 10) << 4) | (year % 10);
// update century
century = (time_calendar->tm_year / 100) + 19;
BX_CMOS_THIS s.reg[0x32] = ((century / 10) << 4) | (century % 10);
}
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