Re: [Qemu-devel] [PATCH] support 93xx EEPROMs with more than 255 words

[Aurelien Jarno <aurelien@aurel32.net>]

On Mon, Feb 23, 2009 at 12:02:12AM +0100, Andre Przywara wrote:
> 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>

Thanks, applied.

> ---
>  hw/eeprom93xx.c |   24 ++++++++++++++----------
>  1 files changed, 14 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/eeprom93xx.c b/hw/eeprom93xx.c
> index 527fdf7..e791894 100644
> --- 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);
> +            dummy = 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;
>  }
> -- 
> 1.5.2.2
> 
> 
> 
> 
> 

-- 
Aurelien Jarno	                        GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net