ECP DMA jumpers, configuration via MBDMA where supported, and the Radisys Configuration device.

src/device/CMakeLists.txt

@@ -54,6 +54,7 @@ add_library(dev OBJECT
     pci_bridge.c
     phoenix_486_jumper.c
     postcard.c
+    radisys_config.c
     serial.c
     serial_passthrough.c
     smbus_ali7101.c

src/device/lpt.c

@@ -25,12 +25,14 @@
 #include <86box/network.h>
 #include <86box/plat_fallthrough.h>
 
-static int   next_inst               = 0;
-int          lpt_3bc_used            = 0;
+static int    next_inst               = 0;
+static int    lpt_3bc_used            = 0;
 
-lpt_port_t   lpt_ports[PARALLEL_MAX];
+static lpt_t *lpt1;
 
-lpt_device_t lpt_devs[PARALLEL_MAX];
+lpt_port_t    lpt_ports[PARALLEL_MAX];
+
+lpt_device_t  lpt_devs[PARALLEL_MAX];
 
 const lpt_device_t lpt_none_device = {
     .name          = "None",
@@ -825,6 +827,13 @@ lpt_port_dma(lpt_t *dev, const uint8_t dma)
     lpt_log("Port %i DMA = %02X\n", dev->id, dma);
 }
 
+void
+lpt1_dma(const uint8_t dma)
+{
+    if (lpt1 != NULL)
+        lpt_port_dma(lpt1, dma);
+}
+
 void
 lpt_port_remove(lpt_t *dev)
 {
@@ -894,6 +903,9 @@ lpt_close(void *priv)
 
     }
 
+    if (lpt1 == dev)
+        lpt1 = NULL;
+
     free(dev);
 }
 
@@ -962,7 +974,10 @@ lpt_init(const device_t *info)
 
         dev->addr             = 0xffff;
         dev->irq              = 0xff;
-        dev->dma              = 0xff;
+        if ((jumpered_internal_ecp_dma >= 0) && (jumpered_internal_ecp_dma != 4))
+            dev->dma              = jumpered_internal_ecp_dma;
+        else
+            dev->dma              = 0xff;
         dev->enable_irq       = 0x00;
         dev->cfg_regs_enabled = 0;
         dev->ext              = 0;
@@ -1005,6 +1020,9 @@ lpt_init(const device_t *info)
     if (!(info->local & 0xfff00000))
         next_inst++;
 
+    if (lpt1 == NULL)
+        lpt1 = dev;
+
     return dev;
 }
 

src/device/radisys_config.c

@@ -0,0 +1,89 @@
+/*
+ * 86Box    A hypervisor and IBM PC system emulator that specializes in
+ *          running old operating systems and software designed for IBM
+ *          PC systems and compatibles from 1981 through fairly recent
+ *          system designs based on the PCI bus.
+ *
+ *          This file is part of the 86Box distribution.
+ *
+ *          Implementation of the Radisys EPC-2012 Configuration registers.
+ *
+ * Authors: Miran Grca, <mgrca8@gmail.com>
+ *
+ *          Copyright 2025 Miran Grca.
+ */
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#define HAVE_STDARG_H
+#include <86box/86box.h>
+#include "cpu.h"
+#include <86box/timer.h>
+#include <86box/io.h>
+#include <86box/device.h>
+#include <86box/machine.h>
+#include <86box/lpt.h>
+#include <86box/machine.h>
+#include <86box/chipset.h>
+#include <86box/plat_unused.h>
+
+typedef struct radisys_config_t {
+    uint8_t regs[2];
+} radisys_config_t;
+
+static uint8_t
+radisys_config_read(uint16_t port, void *priv)
+{
+    radisys_config_t *dev = (radisys_config_t *) priv;
+    uint8_t           ret = dev->regs[port & 0x0001];
+
+    return ret;
+}
+
+static void
+radisys_config_write(uint16_t port, uint8_t val, void *priv)
+{
+    radisys_config_t *dev = (radisys_config_t *) priv;
+
+    dev->regs[port & 0x0001] = val;
+
+    if (!(port & 0x0001) && machine_has_jumpered_ecp_dma(machine, MACHINE_DMA_USE_CONFIG))
+        lpt1_dma((val & 0x02) ? 3 : 1);
+}
+
+static void
+radisys_config_close(void *priv)
+{
+    radisys_config_t *dev = (radisys_config_t *) priv;
+
+    free(dev);
+}
+
+static void *
+radisys_config_init(UNUSED(const device_t *info))
+{
+    /* We have to return something non-NULL. */
+    radisys_config_t *dev = (radisys_config_t *) calloc(1, sizeof(radisys_config_t));
+
+    /* 370h is also supported. */
+    io_sethandler(0x0270, 0x0002, radisys_config_read, NULL, NULL, radisys_config_write, NULL, NULL, dev);
+
+    return dev;
+}
+
+const device_t radisys_config_device = {
+    .name          = "Radisys EPC-2012 Configuration",
+    .internal_name = "radisys_config",
+    .flags         = 0,
+    .local         = 0,
+    .init          = radisys_config_init,
+    .close         = radisys_config_close,
+    .reset         = NULL,
+    .available     = NULL,
+    .speed_changed = NULL,
+    .force_redraw  = NULL,
+    .config        = NULL
+};