[Qemu-devel] [6918] hw/eeprom93xx.c: support 93xx EEPROMs with more than 255 words

[Qemu-devel] [6918] hw/eeprom93xx.c: support 93xx EEPROMs with more than 255 words

[Aurelien Jarno]

Revision: 6918
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6918
Author:   aurel32
Date:     2009-03-28 23:14:52 +0000 (Sat, 28 Mar 2009)
Log Message:
-----------
hw/eeprom93xx.c: support 93xx EEPROMs with more than 255 words

In the head of eeprom93xx.c we promise to support chips with 256 words,
but store the size in an unsigned byte. This patch replaces this with an
16 bit variable and changes the load/store code accordingly (introducing a
new version).

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

Modified Paths:
--------------
    trunk/hw/eeprom93xx.c

Modified: trunk/hw/eeprom93xx.c
===================================================================
--- trunk/hw/eeprom93xx.c	2009-03-28 23:14:41 UTC (rev 6917)
+++ trunk/hw/eeprom93xx.c	2009-03-28 23:14:52 UTC (rev 6918)
@@ -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 @@
     uint8_t eedo;
 
     uint8_t  addrbits;
-    uint8_t  size;
+    uint16_t size;
     uint16_t data;
     uint16_t contents[0];
 };
@@ -106,8 +107,7 @@
     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 @@
        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 @@
         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 @@
     /* 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;
 }