Added chipset and xta interface to Philips machines.

Major refactoring.

src/chipset/CMakeLists.txt

@@ -17,6 +17,7 @@ add_library(chipset OBJECT acc2168.c cs8230.c ali1217.c ali1429.c headland.c int
 	cs4031.c intel_420ex.c intel_4x0.c intel_sio.c intel_piix.c ../ioapic.c
 	neat.c opti495.c opti895.c opti5x7.c scamp.c scat.c via_vt82c49x.c
 	via_vt82c505.c sis_85c310.c sis_85c4xx.c sis_85c496.c sis_85c50x.c
+	gc100.c
 	opti283.c opti291.c via_apollo.c via_pipc.c wd76c10.c
 	vl82c480.c)
 

src/chipset/gc100.c

@@ -0,0 +1,256 @@
+/*
+ * 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 G2 GC100/GC100A chipset.
+ *      NOTE: As documentation is currently available only for the
+ *      CG100 chipset, the GC100A chipset has been reverese-engineered. 
+ *      Thus, its behavior may not be fully accurate.
+ *
+ * Authors: EngiNerd <webmaster.crrc@yahoo.it>
+ *
+ *		Copyright 2020-2021 EngiNerd
+ */
+
+#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 <86box/nmi.h>
+#include <86box/timer.h>
+#include <86box/pit.h>
+#include <86box/mem.h>
+#include <86box/device.h>
+#include <86box/fdd.h>
+#include <86box/fdc.h>
+#include <86box/fdc_ext.h>
+#include <86box/hdc.h>
+#include <86box/gameport.h>
+#include <86box/ibm_5161.h>
+#include <86box/keyboard.h>
+#include <86box/rom.h>
+#include <86box/machine.h>
+#include <86box/chipset.h>
+#include <86box/io.h>
+#include <86box/video.h>
+
+typedef struct
+{
+    uint8_t	reg[0x10];
+} gc100_t;
+
+#define ENABLE_GC100_LOG 1
+
+#ifdef ENABLE_GC100_LOG
+int gc100_do_log = ENABLE_GC100_LOG;
+static void
+gc100_log(const char *fmt, ...)
+{
+    va_list ap;
+
+    if (gc100_do_log) {
+        va_start(ap, fmt);
+        pclog_ex(fmt, ap);
+    	va_end(ap);
+    }
+}
+#else
+#define gc100_log(fmt, ...)
+#endif
+
+static uint8_t
+get_fdd_switch_settings(){
+    
+    int i, fdd_count = 0;
+    
+    for (i = 0; i < FDD_NUM; i++) {
+                if (fdd_get_flags(i))
+                    fdd_count++;
+    }
+
+    if (!fdd_count)
+        return 0x00;
+    else
+        return ((fdd_count - 1) << 6) | 0x01;    
+
+}
+
+static uint8_t
+get_videomode_switch_settings(){
+    
+    if (video_is_mda())
+        return 0x30;
+    else if (video_is_cga())
+        return 0x20;	/* 0x10 would be 40x25 */
+    else
+        return 0x00;    
+
+}
+
+static void
+gc100_write(uint16_t port, uint8_t val, void *priv)
+{
+    gc100_t *dev = (gc100_t *) priv;
+    
+    uint16_t addr = port & 0xf;
+
+    dev->reg[addr] = val;
+
+    switch (addr)
+    {
+    /* addr 0x2
+     * bits 5-7: not used
+     * bit 4: intenal memory wait states
+     * bits 2-3: external memory wait states
+     * bits 0-1: i/o access wait states
+     */
+    case 0x2:
+        break;
+    
+    /* addr 0x3
+     * bits 1-7: not used
+     * bit 0: turbo 0 xt 1
+     */
+    case 0x3:
+        if (val & 0x1)
+            cpu_dynamic_switch(0);
+        else
+            cpu_dynamic_switch(cpu);
+        break;
+    
+    /* addr 0x5
+     * programmable dip-switches
+     * bits 6-7: floppy drive number
+     * bits 4-5: video mode
+     * bits 2-3: memory size
+     * bit 1: fpu
+     * bit 0: not used
+     */
+    
+    /* addr 0x6 */
+    
+    /* addr 0x7 */
+    
+    }
+    
+    gc100_log("GC100: Write %02x at %02x\n", val, port);
+    
+}
+
+static uint8_t
+gc100_read(uint16_t port, void *priv)
+{
+    gc100_t *dev = (gc100_t *) priv;
+    uint8_t ret = 0xff;
+
+    uint16_t addr = port & 0xf;
+
+    ret = dev->reg[addr];
+    
+    gc100_log("GC100: Read %02x at %02x\n", ret, port);
+
+    switch (addr)
+    {
+    /* addr 0x2
+     * bits 5-7: not used
+     * bit 4: intenal memory wait states
+     * bits 2-3: external memory wait states
+     * bits 0-1: i/o access wait states
+     */
+    case 0x2:
+        break;
+    
+    /* addr 0x3
+     * bits 1-7: not used
+     * bit 0: turbo 0 xt 1
+     */
+    case 0x3:
+        break;
+    
+    /* addr 0x5
+     * programmable dip-switches
+     * bits 6-7: floppy drive number
+     * bits 4-5: video mode
+     * bits 2-3: memory size
+     * bit 1: fpu
+     * bit 0: not used
+     */
+    case 0x5:
+        ret = ret & 0x0c;
+        ret |= get_fdd_switch_settings();
+        ret |= get_videomode_switch_settings();
+        if (hasfpu)
+            ret |= 0x02;
+
+        break;
+    
+    /* addr 0x6 */
+    
+    /* addr 0x7 */
+    
+    }
+
+    return ret;
+}
+
+
+static void
+gc100_close(void *priv)
+{
+    gc100_t *dev = (gc100_t *) priv;
+
+    free(dev);
+}
+
+static void *
+gc100_init(const device_t *info)
+{
+    gc100_t *dev = (gc100_t *) malloc(sizeof(gc100_t));
+    memset(dev, 0, sizeof(gc100_t));
+
+    dev->reg[0x2] = 0xff;
+    dev->reg[0x3] = 0x0;
+    dev->reg[0x5] = 0x0;
+    dev->reg[0x6] = 0x0;
+    dev->reg[0x7] = 0x0;
+    
+    /* GC100A */
+    if(info->local) {
+        io_sethandler(0x0c2, 0x02, gc100_read, NULL, NULL, gc100_write, NULL, NULL, dev);
+        io_sethandler(0x0c5, 0x03, gc100_read, NULL, NULL, gc100_write, NULL, NULL, dev);
+    }
+    /* GC100 */
+    else {
+        io_sethandler(0x022, 0x02, gc100_read, NULL, NULL, gc100_write, NULL, NULL, dev);
+        io_sethandler(0x025, 0x01, gc100_read, NULL, NULL, gc100_write, NULL, NULL, dev);
+    }
+    
+    return dev;
+}
+
+const device_t gc100_device = {
+    "G2 GC100",
+    0,
+    0,
+    gc100_init, gc100_close, NULL,
+    { NULL }, NULL, NULL,
+    NULL
+};
+
+const device_t gc100a_device = {
+    "G2 GC100A",
+    0,
+    1,
+    gc100_init, gc100_close, NULL,
+    { NULL }, NULL, NULL,
+    NULL
+};
+