Initial submission of the PCem-Experimental source code.

2016-06-26 00:34:39 +02:00
parent 09d7c4384f
commit fd2a5bc9f5
610 changed files with 184352 additions and 0 deletions
--- a/src/headland.c
+++ b/src/headland.c
@@ -0,0 +1,46 @@
+#include "ibm.h"
+#include "io.h"
+#include "mem.h"
+#include "cpu.h"
+
+#include "headland.h"
+
+static int headland_index;
+static uint8_t headland_regs[256];
+
+void headland_write(uint16_t addr, uint8_t val, void *priv)
+{
+        if (addr & 1)
+        {
+                if (headland_index == 0xc1 && !is486) val = 0;
+                headland_regs[headland_index] = val;
+                pclog("Headland write %02X %02X\n",headland_index,val);
+                if (headland_index == 0x82)
+                {
+                        shadowbios = val & 0x10;
+                        shadowbios_write = !(val & 0x10);
+                        if (shadowbios)
+                                mem_set_mem_state(0xf0000, 0x10000, MEM_READ_INTERNAL | MEM_WRITE_DISABLED);
+                        else
+                                mem_set_mem_state(0xf0000, 0x10000, MEM_READ_EXTERNAL | MEM_WRITE_INTERNAL);
+                }
+        }
+        else
+                headland_index = val;
+}
+
+uint8_t headland_read(uint16_t addr, void *priv)
+{
+        if (addr & 1) 
+        {
+                if ((headland_index >= 0xc0 || headland_index == 0x20) && cpu_iscyrix)
+                        return 0xff; /*Don't conflict with Cyrix config registers*/
+                return headland_regs[headland_index];
+        }
+        return headland_index;
+}
+
+void headland_init()
+{
+        io_sethandler(0x0022, 0x0002, headland_read, NULL, NULL, headland_write, NULL, NULL, NULL);
+}