+#include <stdlib.h>
+#include <string.h>
+
/* sim65 */
#include "chipif.h"
+/*****************************************************************************/
+/* Forwards */
+/*****************************************************************************/
+
+
+
+int InitChip (const struct SimData* Data);
+/* Initialize the chip, return an error code */
+
+static void* InitInstance (unsigned Addr, unsigned Range);
+/* Initialize a new chip instance */
+
+static void WriteCtrl (void* Data, unsigned Addr, unsigned char Val);
+/* Write control data */
+
+static void Write (void* Data, unsigned Addr, unsigned char Val);
+/* Write user data */
+
+static unsigned char ReadCtrl (void* Data, unsigned Addr);
+/* Read control data */
+
+static unsigned char Read (void* Data, unsigned Addr);
+/* Read user data */
+
+
+
/*****************************************************************************/
/* Data */
/*****************************************************************************/
+/* Control data passed to the main program */
+static const struct ChipData RAMData[1] = {
+ {
+ "RAM", /* Name 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;
+
+/* Possible RAM attributes */
+#define ATTR_INITIALIZED 0x01 /* RAM cell is intialized */
+#define ATTR_WPROT 0x02 /* RAM cell is write protected */
+
+/* Data for one RAM instance */
+typedef struct InstanceData InstanceData;
+struct InstanceData {
+ unsigned BaseAddr; /* Base address */
+ unsigned Range; /* Memory range */
+ unsigned char* MemAttr; /* Memory attributes */
+ unsigned char* Mem; /* The memory itself */
+};
+
+
+
/*****************************************************************************/
-/* Code */
+/* Exported function */
/*****************************************************************************/
int GetChipData (const ChipData** Data, unsigned* Count)
{
- *Data = 0;
- *Count = 0;
- return 1;
+ /* Pass the control structure to the caller */
+ *Data = RAMData;
+ *Count = sizeof (Data) / sizeof (Data[0]);
+
+ /* Call was successful */
+ return 0;
+}
+
+
+
+/*****************************************************************************/
+/* Code */
+/*****************************************************************************/
+
+
+
+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)
+/* Initialize a new chip instance */
+{
+ /* 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->MemAttr = Sim->Malloc (Range * sizeof (D->MemAttr[0]));
+ D->Mem = Sim->Malloc (Range * sizeof (D->Mem[0]));
+
+ /* Clear the RAM and attribute memory */
+ memset (D->MemAttr, 0, Range * sizeof (D->MemAttr[0]));
+ memset (D->Mem, 0, Range * sizeof (D->Mem[0]));
+
+ /* Done, return the instance data */
+ return D;
+}
+
+
+
+static void WriteCtrl (void* Data, unsigned Addr, unsigned char Val)
+/* Write control data */
+{
+ /* Cast the data pointer */
+ InstanceData* D = (InstanceData*) Data;
+
+ /* Do the write and remember the cell as initialized */
+ D->Mem[Addr] = Val;
+ D->MemAttr[Addr] |= ATTR_INITIALIZED;
+}
+
+
+
+static void Write (void* Data, unsigned Addr, unsigned char Val)
+/* Write user data */
+{
+ /* Cast the data pointer */
+ InstanceData* D = (InstanceData*) Data;
+
+ /* Check for a write to a write protected cell */
+ if (D->MemAttr[Addr] & ATTR_WPROT) {
+ Sim->Warning ("Writing to write protected memory at $%04X", Addr);
+ }
+
+ /* Do the write and remember the cell as initialized */
+ D->Mem[Addr] = Val;
+ D->MemAttr[Addr] |= ATTR_INITIALIZED;
+}
+
+
+
+static unsigned char ReadCtrl (void* Data, unsigned Addr)
+/* Read control data */
+{
+ /* Cast the data pointer */
+ InstanceData* D = (InstanceData*) Data;
+
+ /* Read the cell and return the value */
+ return D->Mem[Addr];
}
+static unsigned char Read (void* Data, unsigned Addr)
+/* Read user data */
+{
+ /* Cast the data pointer */
+ InstanceData* D = (InstanceData*) Data;
+
+ /* Check for a read from an uninitialized cell */
+ if ((D->MemAttr[Addr] & ATTR_INITIALIZED) == 0) {
+ /* We're reading a memory cell that was never written to */
+ Sim->Warning ("Reading from uninitialized memory at $%04X", Addr);
+ }
+
+ /* Read the cell and return the value */
+ return D->Mem[Addr];
+}
+
+
+
+
+++ /dev/null
-/*****************************************************************************/
-/* */
-/* simdata.c */
-/* */
-/* Simulator data passed to the chip plugins */
-/* */
-/* */
-/* */
-/* (C) 2002 Ullrich von Bassewitz */
-/* Wacholderweg 14 */
-/* D-70597 Stuttgart */
-/* EMail: uz@musoftware.de */
-/* */
-/* */
-/* 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. */
-/* */
-/*****************************************************************************/
-
-
-
-/* sim65 */
-#include "simdata.h"
-
-
-
-/*****************************************************************************/
-/* Data */
-/*****************************************************************************/
-
-
-
-/* SimData instance */
-const SimData Sim65Data = {
- 1, /* MajorVersion */
- 1 /* MinorVersion */
-};
-
-
-
projects / cc65 / commitdiff