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Commit 3ba5aa8d authored by Rob Swindell's avatar Rob Swindell :speech_balloon:
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Store the UART register/settings in a struct for easy re-init 

Re-init the UART struct in the init routine to avoid confusion when making .ini file changes with older NTVDMs (including NTVDMx64) which don't re-load the VDDs for every invocation.
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with 86 additions and 69 deletions
src/sbbs3/sbbsexec.c
+ 86
− 69
View file @ 3ba5aa8d
......@@ -39,22 +39,37 @@
#define READ_TIMEOUT (30 * 1000) // X00REF.DOC "the timeout value is set to 30 seconds"
/* UART Parameters and virtual registers */
WORD uart_io_base = UART_COM1_IO_BASE; /* COM1 */
BYTE uart_irq = UART_COM1_IRQ;
BYTE uart_ier_reg = 0;
BYTE uart_lcr_reg = UART_LCR_8_DATA_BITS;
BYTE uart_mcr_reg = UART_MCR_DTR;
BYTE uart_lsr_reg = UART_LSR_EMPTY_DATA | UART_LSR_EMPTY_XMIT;
BYTE uart_msr_reg = UART_MSR_CTS | UART_MSR_DSR;
BYTE uart_scratch_reg = 0;
BYTE uart_divisor_latch_lsb = 0x03; /* 38400 */
BYTE uart_divisor_latch_msb = 0x00;
BYTE uart_fifo_enabled = 0;
struct uart {
WORD io_base;
BYTE irq;
BYTE ier_reg;
BYTE lcr_reg;
BYTE mcr_reg;
BYTE lsr_reg;
BYTE msr_reg;
BYTE scratch_reg;
BYTE divisor_latch_lsb;
BYTE divisor_latch_msb;
BYTE fifo_enabled;
BOOL virtualize;
} default_uart = {
.io_base = UART_COM1_IO_BASE, /* COM1 */
.irq = UART_COM1_IRQ,
.ier_reg = 0,
.lcr_reg = UART_LCR_8_DATA_BITS,
.mcr_reg = UART_MCR_DTR,
.lsr_reg = UART_LSR_EMPTY_DATA | UART_LSR_EMPTY_XMIT,
.msr_reg = UART_MSR_CTS | UART_MSR_DSR,
.scratch_reg = 0,
.divisor_latch_lsb = 0x03, /* 38400 */
.divisor_latch_msb = 0x00,
.fifo_enabled = 0
.virtualize = FALSE;
}, uart;
// Notice: re-initialize global variables in VDDInitialize for NTVDMx64 and pre-Vista versions of Windows
int log_level = LOG_INFO;
BOOL virtualize_uart=FALSE;
double yield_interval=1.0;
BOOL dcd_changed = FALSE;
BOOL hangup_supported=TRUE;
......@@ -125,27 +140,27 @@ void parse_ini(char* program)
else
SAFEPRINTF(section,"%s.UART",program);
virtualize_uart=iniGetBool(ini,section,"Virtualize",virtualize_uart);
uart.virtualize=iniGetBool(ini,section,"Virtualize",uart.virtualize);
switch(iniGetInteger(ini,section,"ComPort",0)) {
case 1: /* COM1 */
uart_irq =UART_COM1_IRQ;
uart_io_base =UART_COM1_IO_BASE;
uart.irq =UART_COM1_IRQ;
uart.io_base =UART_COM1_IO_BASE;
break;
case 2: /* COM2 */
uart_irq =UART_COM2_IRQ;
uart_io_base =UART_COM2_IO_BASE;
uart.irq =UART_COM2_IRQ;
uart.io_base =UART_COM2_IO_BASE;
break;
case 3: /* COM3 */
uart_irq =UART_COM3_IRQ;
uart_io_base =UART_COM3_IO_BASE;
uart.irq =UART_COM3_IRQ;
uart.io_base =UART_COM3_IO_BASE;
break;
case 4: /* COM4 */
uart_irq =UART_COM4_IRQ;
uart_io_base =UART_COM4_IO_BASE;
uart.irq =UART_COM4_IRQ;
uart.io_base =UART_COM4_IO_BASE;
break;
}
uart_irq=(BYTE)iniGetShortInt(ini,section,"IRQ",uart_irq);
uart_io_base=iniGetShortInt(ini,section,"Address",uart_io_base);
uart.irq=(BYTE)iniGetShortInt(ini,section,"IRQ",uart.irq);
uart.io_base=iniGetShortInt(ini,section,"Address",uart.io_base);
lprintf(LOG_INFO,"Parsed %s section of %s"
,section
......@@ -163,9 +178,9 @@ void set_interrupt_pending(BYTE intr, BOOL assert)
lprintf(LOG_DEBUG,"%sasserting interrupt %02X (pending: %02X, IER: %02X)"
,assert ? "" : "de-", intr
,pending_interrupts
,uart_ier_reg);
,uart.ier_reg);
if(assert) {
if(uart_ier_reg&intr) { /* is interrupt enabled? */
if(uart.ier_reg&intr) { /* is interrupt enabled? */
pending_interrupts |= intr; /* flag as pending */
SetEvent(interrupt_event);
}
......@@ -180,15 +195,15 @@ void set_interrupt_pending(BYTE intr, BOOL assert)
void data_waiting(BOOL waiting)
{
if(waiting && (uart_mcr_reg & UART_MCR_RTS)) {
if(waiting && (uart.mcr_reg & UART_MCR_RTS)) {
/* Set the "Data ready" bit in the LSR */
uart_lsr_reg |= UART_LSR_DATA_READY;
uart.lsr_reg |= UART_LSR_DATA_READY;
/* assert rx data interrupt */
assert_interrupt(UART_IER_RX_DATA);
} else {
/* Clear the data ready bit in the LSR */
uart_lsr_reg &= ~UART_LSR_DATA_READY;
uart.lsr_reg &= ~UART_LSR_DATA_READY;
/* Clear data ready interrupt identification in IIR */
deassert_interrupt(UART_IER_RX_DATA);
......@@ -211,17 +226,17 @@ void _cdecl interrupt_thread(void *arg)
lprintf(LOG_NOTICE, "Waiting for interrupt returned %ld", result);
break;
}
if((uart_ier_reg&pending_interrupts) != 0) {
if((uart.ier_reg&pending_interrupts) != 0) {
lprintf(LOG_DEBUG,"VDDSimulateInterrupt (pending: %02X) - IER: %02X"
,pending_interrupts, uart_ier_reg);
VDDSimulateInterrupt(ICA_MASTER, uart_irq, /* count: */1);
,pending_interrupts, uart.ier_reg);
VDDSimulateInterrupt(ICA_MASTER, uart.irq, /* count: */1);
}
#if 0
/* "Real 16550s should always reassert
* this interrupt whenever the transmitter is idle and
* the interrupt is enabled."
*/
if(pending_interrupts==0 && uart_ier_reg&UART_IER_TX_EMPTY)
if(pending_interrupts==0 && uart.ier_reg&UART_IER_TX_EMPTY)
assert_interrupt(UART_IER_TX_EMPTY);
#endif
}
......@@ -257,7 +272,7 @@ void _cdecl input_thread(void* arg)
}
RingBufWrite(&rdbuf,buf,count);
if(virtualize_uart) {
if(uart.virtualize) {
data_waiting(TRUE);
}
}
......@@ -325,15 +340,15 @@ static char *chr(uchar ch)
VOID uart_wrport(WORD port, BYTE data)
{
int reg = port - uart_io_base;
int reg = port - uart.io_base;
int retval;
lprintf(LOG_DEBUG,"write of port: %x (%s) <- %02X", port, uart_reg_desc[reg], data);
switch(reg) {
case UART_BASE:
if(uart_lcr_reg&UART_LCR_DLAB) {
uart_divisor_latch_lsb = data;
if(uart.lcr_reg&UART_LCR_DLAB) {
uart.divisor_latch_lsb = data;
lprintf(LOG_DEBUG,"set divisor latch low byte: %02X", data);
} else { // Transmitter Holding Register
if(log_level >= LOG_DEBUG)
......@@ -348,32 +363,32 @@ VOID uart_wrport(WORD port, BYTE data)
}
break;
case UART_IER:
if(uart_lcr_reg&UART_LCR_DLAB) {
uart_divisor_latch_msb = data;
if(uart.lcr_reg&UART_LCR_DLAB) {
uart.divisor_latch_msb = data;
lprintf(LOG_DEBUG,"set divisor latch high byte: %02X", data);
} else {
uart_ier_reg = data;
uart.ier_reg = data;
lprintf(LOG_DEBUG, "Set IER to %02X", data);
}
assert_interrupt(UART_IER_TX_EMPTY); /* should this be re-asserted for all writes? */
break;
case UART_FCR:
uart_fifo_enabled = data & UART_FCR_ENABLE_FIFO;
uart.fifo_enabled = data & UART_FCR_ENABLE_FIFO;
lprintf(LOG_INFO, "Set FCR to %02X", data);
break;
case UART_LCR:
uart_lcr_reg = data;
uart.lcr_reg = data;
lprintf(LOG_INFO, "Set LCR to %02X", data);
break;
case UART_MCR:
uart_mcr_reg = data;
if((uart_mcr_reg&UART_MCR_DTR) == 0) /* Dropping DTR (i.e. "hangup") */
uart.mcr_reg = data;
if((uart.mcr_reg&UART_MCR_DTR) == 0) /* Dropping DTR (i.e. "hangup") */
hangup();
data_waiting(RingBufFull(&rdbuf));
lprintf(LOG_INFO, "Set MCR to %02X", data);
break;
case UART_SCRATCH:
uart_scratch_reg = data;
uart.scratch_reg = data;
lprintf(LOG_INFO, "Set scratch register to %02X", data);
break;
default:
......@@ -385,16 +400,16 @@ VOID uart_wrport(WORD port, BYTE data)
VOID uart_rdport(WORD port, PBYTE data)
{
int reg = port - uart_io_base;
int reg = port - uart.io_base;
DWORD avail;
lprintf(LOG_DEBUG,"read of port: %x (%s)", port, uart_reg_desc[reg]);
switch(reg) {
case UART_BASE:
if(uart_lcr_reg&UART_LCR_DLAB) {
if(uart.lcr_reg&UART_LCR_DLAB) {
lputs(LOG_DEBUG,"reading divisor latch LSB");
*data = uart_divisor_latch_lsb;
*data = uart.divisor_latch_lsb;
break;
}
if((avail=RingBufFull(&rdbuf))!=0) {
......@@ -407,11 +422,11 @@ VOID uart_rdport(WORD port, PBYTE data)
data_waiting(avail);
break;
case UART_IER:
if(uart_lcr_reg&UART_LCR_DLAB) {
if(uart.lcr_reg&UART_LCR_DLAB) {
lputs(LOG_DEBUG,"reading divisor latch MSB");
*data = uart_divisor_latch_msb;
*data = uart.divisor_latch_msb;
} else
*data = uart_ier_reg;
*data = uart.ier_reg;
break;
case UART_IIR:
{
......@@ -432,42 +447,42 @@ VOID uart_rdport(WORD port, PBYTE data)
*data = UART_IIR_NONE;
if(pending_interrupts)
SetEvent(interrupt_event);
if(uart_fifo_enabled)
if(uart.fifo_enabled)
*data |= UART_IIR_FIFO_ENABLED;
lprintf(LOG_DEBUG, "IIR: %02X (pending: %02X)", *data, pending_interrupts);
break;
}
case UART_LCR:
*data = uart_lcr_reg;
lprintf(LOG_INFO, "LCR: %02X", uart_lcr_reg);
*data = uart.lcr_reg;
lprintf(LOG_INFO, "LCR: %02X", uart.lcr_reg);
break;
case UART_MCR:
*data = uart_mcr_reg;
lprintf(LOG_INFO, "MCR: %02X", uart_mcr_reg);
*data = uart.mcr_reg;
lprintf(LOG_INFO, "MCR: %02X", uart.mcr_reg);
break;
case UART_LSR:
*data = uart_lsr_reg;
*data = uart.lsr_reg;
/* Clear line status interrupt pending */
deassert_interrupt(UART_IER_LINE_STATUS);
lprintf(LOG_DEBUG, "LSR: %02X", *data);
break;
case UART_MSR:
if(WaitForSingleObject(hungup_event,0)==WAIT_OBJECT_0)
uart_msr_reg &= ~UART_MSR_DCD;
uart.msr_reg &= ~UART_MSR_DCD;
else
uart_msr_reg |= UART_MSR_DCD;
uart.msr_reg |= UART_MSR_DCD;
if(dcd_changed)
uart_msr_reg |= UART_MSR_DCD_CHANGE;
uart.msr_reg |= UART_MSR_DCD_CHANGE;
else
uart_msr_reg &= ~UART_MSR_DCD_CHANGE;
uart.msr_reg &= ~UART_MSR_DCD_CHANGE;
dcd_changed = FALSE;
*data = uart_msr_reg;
*data = uart.msr_reg;
/* Clear modem status interrupt pending */
deassert_interrupt(UART_IER_MODEM_STATUS);
lprintf(LOG_DEBUG, "MSR: %02X", *data);
break;
case UART_SCRATCH:
*data = uart_scratch_reg;
*data = uart.scratch_reg;
break;
default:
lprintf(LOG_ERR,"UNSUPPORTED register: %u", reg);
......@@ -589,14 +604,14 @@ __declspec(dllexport) void __cdecl VDDDispatch(void)
lprintf(LOG_INFO,"Yield interval: %f milliseconds", yield_interval);
if(virtualize_uart) {
if(uart.virtualize) {
lprintf(LOG_INFO,"Virtualizing UART (0x%x, IRQ %u)"
,uart_io_base, uart_irq);
,uart.io_base, uart.irq);
IOHandlers.inb_handler = uart_rdport;
IOHandlers.outb_handler = uart_wrport;
PortRange.First=uart_io_base;
PortRange.Last=uart_io_base + UART_IO_RANGE;
PortRange.First=uart.io_base;
PortRange.Last=uart.io_base + UART_IO_RANGE;
VDDInstallIOHook((HANDLE)getAX(), 1, &PortRange, &IOHandlers);
......@@ -626,7 +641,7 @@ __declspec(dllexport) void __cdecl VDDDispatch(void)
lprintf(LOG_INFO," read=%u bytes (in %u calls)",bytes_read,reads);
lprintf(LOG_INFO," wrote=%u bytes (in %u calls)",bytes_written,writes);
if(virtualize_uart) {
if(uart.virtualize) {
lputs(LOG_INFO,"Uninstalling Virtualizaed UART IO Hook");
VDDDeInstallIOHook((HANDLE)getAX(), 1, &PortRange);
DeleteCriticalSection(&interrupt_mutex);
......@@ -857,7 +872,8 @@ __declspec(dllexport) void __cdecl VDDDispatch(void)
case VDD_LOAD_INI_SECTION: /* Parse (program-specific) sub-section of settings file */
count = getCX();
p = (BYTE*)GetVDMPointer((ULONG)((getES() << 16)|getDI())
,count,FALSE);
,count,FALSE);
lprintf(LOG_INFO, "LOAD_INI_SECTION: %s", p);
parse_ini(p);
break;
......@@ -873,7 +889,7 @@ __declspec(dllexport) void __cdecl VDDDispatch(void)
break;
case VDD_VIRTUALIZE_UART:
virtualize_uart = TRUE;
uart.virtualize = TRUE;
break;
default:
......@@ -886,6 +902,7 @@ __declspec(dllexport) void __cdecl VDDDispatch(void)
__declspec(dllexport) BOOL __cdecl VDDInitialize(IN PVOID hVDD, IN ULONG Reason,
IN PCONTEXT Context OPTIONAL)
{
memcpy(&uart, &default_uart, sizeof(uart));
log_level = LOG_INFO;
lputs(LOG_INFO, __FUNCTION__);
return TRUE;
......
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