hw/eeprom93xx.c: support 93xx EEPROMs with more than 255 words

[qemu] / hw / eeprom93xx.c

diff --git a/hw/eeprom93xx.c b/hw/eeprom93xx.c
index 1d546e2..ae15a7f 100644 (file)
--- a/hw/eeprom93xx.c
+++ b/hw/eeprom93xx.c
@@ -49,8 +49,9 @@
 #define logout(fmt, args...) ((void)0)
 #endif
 
-static int eeprom_instance = 0;
-static const int eeprom_version = 20061112;
+#define EEPROM_INSTANCE  0
+#define OLD_EEPROM_VERSION 20061112
+#define EEPROM_VERSION (OLD_EEPROM_VERSION + 1)
 
 #if 0
 typedef enum {
@@ -83,7 +84,7 @@ struct _eeprom_t {
     uint8_t eedo;
 
     uint8_t  addrbits;
-    uint8_t  size;
+    uint16_t size;
     uint16_t data;
     uint16_t contents[0];
 };
@@ -106,8 +107,7 @@ static void eeprom_save(QEMUFile *f, void *opaque)
     qemu_put_byte(f, eeprom->eedo);
 
     qemu_put_byte(f, eeprom->addrbits);
-    qemu_put_byte(f, eeprom->size);
-    qemu_put_byte(f, 0);                  /* padding for compatiblity */
+    qemu_put_be16(f, eeprom->size);
     qemu_put_be16(f, eeprom->data);
     for (address = 0; address < eeprom->size; address++) {
         qemu_put_be16(f, eeprom->contents[address]);
@@ -120,9 +120,9 @@ static int eeprom_load(QEMUFile *f, void *opaque, int version_id)
        of data and current EEPROM are identical. */
     eeprom_t *eeprom = (eeprom_t *)opaque;
     int result = -EINVAL;
-    if (version_id == eeprom_version) {
+    if (version_id >= OLD_EEPROM_VERSION) {
         unsigned address;
-        uint8_t size = eeprom->size;
+        int size = eeprom->size;
 
         eeprom->tick = qemu_get_byte(f);
         eeprom->address = qemu_get_byte(f);
@@ -134,8 +134,12 @@ static int eeprom_load(QEMUFile *f, void *opaque, int version_id)
         eeprom->eedo = qemu_get_byte(f);
 
         eeprom->addrbits = qemu_get_byte(f);
-        eeprom->size = qemu_get_byte(f);
-        qemu_get_byte(f);                   /* skip padding byte */
+        if (version_id == OLD_EEPROM_VERSION) {
+            eeprom->size = qemu_get_byte(f);
+            qemu_get_byte(f);
+        } else {
+            eeprom->size = qemu_get_be16(f);
+        }
 
         if (eeprom->size == size) {
             eeprom->data = qemu_get_be16(f);
@@ -317,7 +321,7 @@ eeprom_t *eeprom93xx_new(uint16_t nwords)
     /* Output DO is tristate, read results in 1. */
     eeprom->eedo = 1;
     logout("eeprom = 0x%p, nwords = %u\n", eeprom, nwords);
-    register_savevm("eeprom", eeprom_instance, eeprom_version,
+    register_savevm("eeprom", EEPROM_INSTANCE, EEPROM_VERSION,
                     eeprom_save, eeprom_load, eeprom);
     return eeprom;
 }