Update PiSCSI readme

[pistorm] / platforms / amiga / amiga-registers.c

diff --git a/platforms/amiga/amiga-registers.c b/platforms/amiga/amiga-registers.c
index 0357dfc1cee4e199f21ea7dba9c7874129109fd5..056d4c9dfdbe15f6f675bb4a2a991631d7917bb1 100644 (file)
--- a/platforms/amiga/amiga-registers.c
+++ b/platforms/amiga/amiga-registers.c
@@ -1,50 +1,69 @@
-#include "../../Gayle.h"
-#include "../../config_file/config_file.h"
+// SPDX-License-Identifier: MIT
 
-#define GAYLEBASE 0xD80000  // D7FFFF
-#define GAYLESIZE 0x6FFFF
+#include "Gayle.h"
+#include "config_file/config_file.h"
+#include "amiga-registers.h"
+
+uint8_t rtc_emulation_enabled = 1;
+extern int gayle_emulation_enabled;
+
+void configure_rtc_emulation_amiga(uint8_t enabled) {
+    if (enabled == rtc_emulation_enabled)
+        return;
+
+    rtc_emulation_enabled = enabled;
+    printf("Amiga RTC emulation is now %s.\n", (enabled) ? "enabled" : "disabled");
+}
 
 int handle_register_read_amiga(unsigned int addr, unsigned char type, unsigned int *val) {
-    if (addr > GAYLEBASE && addr < GAYLEBASE + GAYLESIZE) {
-        switch(type) {
-        case OP_TYPE_BYTE:
-            *val = readGayleB(addr);
-            return 1;
-            break;
-        case OP_TYPE_WORD:
-            *val = readGayle(addr);
-            return 1;
-            break;
-        case OP_TYPE_LONGWORD:
-            *val = readGayleL(addr);
-            return 1;
-            break;
-        case OP_TYPE_MEM:
+    if (gayle_emulation_enabled) {
+        if (!rtc_emulation_enabled && addr >= CLOCKBASE && addr < CLOCKBASE + CLOCKSIZE)
             return -1;
-            break;
+        if (addr >= GAYLEBASE && addr < GAYLEBASE + GAYLESIZE) {
+            switch(type) {
+            case OP_TYPE_BYTE:
+                *val = readGayleB(addr);
+                return 1;
+                break;
+            case OP_TYPE_WORD:
+                *val = readGayle(addr);
+                return 1;
+                break;
+            case OP_TYPE_LONGWORD:
+                *val = readGayleL(addr);
+                return 1;
+                break;
+            case OP_TYPE_MEM:
+                return -1;
+                break;
+            }
         }
     }
     return -1;
 }
 
 int handle_register_write_amiga(unsigned int addr, unsigned int value, unsigned char type) {
-    if (addr > GAYLEBASE && addr < GAYLEBASE + GAYLESIZE) {
-        switch(type) {
-        case OP_TYPE_BYTE:
-            writeGayleB(addr, value);
-            return 1;
-            break;
-        case OP_TYPE_WORD:
-            writeGayle(addr, value);
-            return 1;
-            break;
-        case OP_TYPE_LONGWORD:
-            writeGayleL(addr, value);
-            return 1;
-            break;
-        case OP_TYPE_MEM:
+    if (gayle_emulation_enabled) {
+        if (!rtc_emulation_enabled && addr >= CLOCKBASE && addr < CLOCKBASE + CLOCKSIZE)
             return -1;
-            break;
+        if (addr >= GAYLEBASE && addr < GAYLEBASE + GAYLESIZE) {
+            switch(type) {
+            case OP_TYPE_BYTE:
+                writeGayleB(addr, value);
+                return 1;
+                break;
+            case OP_TYPE_WORD:
+                writeGayle(addr, value);
+                return 1;
+                break;
+            case OP_TYPE_LONGWORD:
+                writeGayleL(addr, value);
+                return 1;
+                break;
+            case OP_TYPE_MEM:
+                return -1;
+                break;
+            }
         }
     }
     return -1;