+/*****************************************************************************/
+/* */
+/* rom.c */
+/* */
+/* ROM plugin for the sim65 6502 simulator */
+/* */
+/* */
+/* */
+/* (C) 2003 Ullrich von Bassewitz */
+/* Römerstrasse 52 */
+/* D-70794 Filderstadt */
+/* EMail: uz@cc65.org */
+/* */
+/* */
+/* This software is provided 'as-is', without any expressed or implied */
+/* warranty. In no event will the authors be held liable for any damages */
+/* arising from the use of this software. */
+/* */
+/* Permission is granted to anyone to use this software for any purpose, */
+/* including commercial applications, and to alter it and redistribute it */
+/* freely, subject to the following restrictions: */
+/* */
+/* 1. The origin of this software must not be misrepresented; you must not */
+/* claim that you wrote the original software. If you use this software */
+/* in a product, an acknowledgment in the product documentation would be */
+/* appreciated but is not required. */
+/* 2. Altered source versions must be plainly marked as such, and must not */
+/* be misrepresented as being the original software. */
+/* 3. This notice may not be removed or altered from any source */
+/* distribution. */
+/* */
+/*****************************************************************************/
+
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+/* sim65 */
+#include "chipif.h"
+
+
+
+/*****************************************************************************/
+/* Forwards */
+/*****************************************************************************/
+
+
+
+static int InitChip (const struct SimData* Data);
+/* Initialize the chip, return an error code */
+
+static void* InitInstance (unsigned Addr, unsigned Range, void* CfgInfo);
+/* Initialize a new chip instance */
+
+static void WriteCtrl (void* Data, unsigned Offs, unsigned char Val);
+/* Write control data */
+
+static void Write (void* Data, unsigned Offs, unsigned char Val);
+/* Write user data */
+
+static unsigned char ReadCtrl (void* Data, unsigned Offs);
+/* Read control data */
+
+static unsigned char Read (void* Data, unsigned Offs);
+/* Read user data */
+
+
+
+/*****************************************************************************/
+/* Data */
+/*****************************************************************************/
+
+
+
+/* Control data passed to the main program */
+static const struct ChipData ROMData[1] = {
+ {
+ "ROM", /* Name of the chip */
+ CHIPDATA_TYPE_CHIP, /* Type of the chip */
+ CHIPDATA_VER_MAJOR, /* Version information */
+ CHIPDATA_VER_MINOR,
+
+ /* -- Exported functions -- */
+ InitChip,
+ InitInstance,
+ WriteCtrl,
+ Write,
+ ReadCtrl,
+ Read
+ }
+};
+
+/* The SimData pointer we get when InitChip is called */
+static const SimData* Sim;
+
+/* Data for one ROM instance */
+typedef struct InstanceData InstanceData;
+struct InstanceData {
+ unsigned BaseAddr; /* Base address */
+ unsigned Range; /* Memory range */
+ unsigned char* Mem; /* The memory itself */
+};
+
+
+
+/*****************************************************************************/
+/* Exported function */
+/*****************************************************************************/
+
+
+
+int GetChipData (const ChipData** Data, unsigned* Count)
+{
+ /* Pass the control structure to the caller */
+ *Data = ROMData;
+ *Count = sizeof (Data) / sizeof (Data[0]);
+
+ /* Call was successful */
+ return 0;
+}
+
+
+
+/*****************************************************************************/
+/* Code */
+/*****************************************************************************/
+
+
+
+static int InitChip (const struct SimData* Data)
+/* Initialize the chip, return an error code */
+{
+ /* Remember the pointer */
+ Sim = Data;
+
+ /* Always successful */
+ return 0;
+}
+
+
+
+static void* InitInstance (unsigned Addr, unsigned Range, void* CfgInfo)
+/* Initialize a new chip instance */
+{
+ char* Name;
+ FILE* F;
+
+ /* Allocate a new instance structure */
+ InstanceData* D = Sim->Malloc (sizeof (InstanceData));
+
+ /* Initialize the structure, allocate RAM and attribute memory */
+ D->BaseAddr = Addr;
+ D->Range = Range;
+ D->Mem = Sim->Malloc (Range);
+
+ /* We must have a "file" attribute. Get it. */
+ if (Sim->GetCfgStr (CfgInfo, "file", &Name) == 0) {
+ /* Attribute not found */
+ Sim->Error ("Attribute `file' missing"); /* ### */
+ }
+
+ /* Open the file with the given name */
+ F = fopen (Name, "rb");
+ if (F == 0) {
+ Sim->Error ("Cannot open `%s': %s", Name, strerror (errno));
+ }
+
+ /* Read the file into the memory */
+ if (fread (D->Mem, 1, D->Range, F) != D->Range) {
+ Sim->Warning ("Cannot read %u bytes from file `%s'", D->Range, Name);
+ }
+
+ /* Close the file */
+ fclose (F);
+
+ /* Free the file name */
+ Sim->Free (Name);
+
+ /* Done, return the instance data */
+ return D;
+}
+
+
+
+static void WriteCtrl (void* Data, unsigned Offs, unsigned char Val)
+/* Write control data */
+{
+ /* Cast the data pointer */
+ InstanceData* D = (InstanceData*) Data;
+
+ /* Do the write */
+ D->Mem[Offs] = Val;
+}
+
+
+
+static void Write (void* Data, unsigned Offs, unsigned char Val)
+/* Write user data */
+{
+ /* Cast the data pointer */
+ InstanceData* D = (InstanceData*) Data;
+
+ /* Print a warning */
+ Sim->Break ("Writing to write protected memory at $%04X (value = $%02X)",
+ D->BaseAddr+Offs, Val);
+}
+
+
+
+static unsigned char ReadCtrl (void* Data, unsigned Offs)
+/* Read control data */
+{
+ /* Cast the data pointer */
+ InstanceData* D = (InstanceData*) Data;
+
+ /* Read the cell and return the value */
+ return D->Mem[Offs];
+}
+
+
+
+static unsigned char Read (void* Data, unsigned Offs)
+/* Read user data */
+{
+ /* Cast the data pointer */
+ InstanceData* D = (InstanceData*) Data;
+
+ /* Read the cell and return the value */
+ return D->Mem[Offs];
+}
+
+
+