diff mbox series

[v42,16/98] hw/sd/sdcard: Generate random RCA value

Message ID 20240628070216.92609-17-philmd@linaro.org
State New
Headers show
Series hw/sd/sdcard: Add eMMC support | expand

Commit Message

Philippe Mathieu-Daudé June 28, 2024, 7 a.m. UTC 
Rather than using the obscure 0x4567 magic value,
use a real random one.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Cédric Le Goater <clg@redhat.com>
---
 hw/sd/sd.c         | 11 ++++++++---
 hw/sd/trace-events |  1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

Comments

Cédric Le Goater June 28, 2024, 7:32 a.m. UTC | #1 
On 6/28/24 9:00 AM, Philippe Mathieu-Daudé wrote:
> Rather than using the obscure 0x4567 magic value,
> use a real random one.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Tested-by: Cédric Le Goater <clg@redhat.com>


Reviewed-by: Cédric Le Goater <clg@redhat.com>

Thanks,

C.


> ---
>   hw/sd/sd.c         | 11 ++++++++---
>   hw/sd/trace-events |  1 +
>   2 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/sd/sd.c b/hw/sd/sd.c
> index 5997e13107..d85b2906f4 100644
> --- a/hw/sd/sd.c
> +++ b/hw/sd/sd.c
> @@ -46,6 +46,7 @@
>   #include "qemu/error-report.h"
>   #include "qemu/timer.h"
>   #include "qemu/log.h"
> +#include "qemu/guest-random.h"
>   #include "qemu/module.h"
>   #include "sdmmc-internal.h"
>   #include "trace.h"
> @@ -488,9 +489,10 @@ static void sd_set_csd(SDState *sd, uint64_t size)
>   
>   /* Relative Card Address register */
>   
> -static void sd_set_rca(SDState *sd)
> +static void sd_set_rca(SDState *sd, uint16_t value)
>   {
> -    sd->rca += 0x4567;
> +    trace_sdcard_set_rca(value);
> +    sd->rca = value;
>   }
>   
>   static uint16_t sd_req_get_rca(SDState *s, SDRequest req)
> @@ -1113,11 +1115,14 @@ static sd_rsp_type_t sd_cmd_ALL_SEND_CID(SDState *sd, SDRequest req)
>   /* CMD3 */
>   static sd_rsp_type_t sd_cmd_SEND_RELATIVE_ADDR(SDState *sd, SDRequest req)
>   {
> +    uint16_t random_rca;
> +
>       switch (sd->state) {
>       case sd_identification_state:
>       case sd_standby_state:
>           sd->state = sd_standby_state;
> -        sd_set_rca(sd);
> +        qemu_guest_getrandom_nofail(&random_rca, sizeof(random_rca));
> +        sd_set_rca(sd, random_rca);
>           return sd_r6;
>   
>       default:
> diff --git a/hw/sd/trace-events b/hw/sd/trace-events
> index 43eaeba149..6a51b0e906 100644
> --- a/hw/sd/trace-events
> +++ b/hw/sd/trace-events
> @@ -43,6 +43,7 @@ sdcard_response(const char *rspdesc, int rsplen) "%s (sz:%d)"
>   sdcard_powerup(void) ""
>   sdcard_inquiry_cmd41(void) ""
>   sdcard_reset(void) ""
> +sdcard_set_rca(uint16_t value) "new RCA: 0x%04x"
>   sdcard_set_blocklen(uint16_t length) "block len 0x%03x"
>   sdcard_set_block_count(uint32_t cnt) "block cnt 0x%"PRIx32
>   sdcard_inserted(bool readonly) "read_only: %u"
diff mbox series

Patch

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 5997e13107..d85b2906f4 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -46,6 +46,7 @@ 
 #include "qemu/error-report.h"
 #include "qemu/timer.h"
 #include "qemu/log.h"
+#include "qemu/guest-random.h"
 #include "qemu/module.h"
 #include "sdmmc-internal.h"
 #include "trace.h"
@@ -488,9 +489,10 @@  static void sd_set_csd(SDState *sd, uint64_t size)
 
 /* Relative Card Address register */
 
-static void sd_set_rca(SDState *sd)
+static void sd_set_rca(SDState *sd, uint16_t value)
 {
-    sd->rca += 0x4567;
+    trace_sdcard_set_rca(value);
+    sd->rca = value;
 }
 
 static uint16_t sd_req_get_rca(SDState *s, SDRequest req)
@@ -1113,11 +1115,14 @@  static sd_rsp_type_t sd_cmd_ALL_SEND_CID(SDState *sd, SDRequest req)
 /* CMD3 */
 static sd_rsp_type_t sd_cmd_SEND_RELATIVE_ADDR(SDState *sd, SDRequest req)
 {
+    uint16_t random_rca;
+
     switch (sd->state) {
     case sd_identification_state:
     case sd_standby_state:
         sd->state = sd_standby_state;
-        sd_set_rca(sd);
+        qemu_guest_getrandom_nofail(&random_rca, sizeof(random_rca));
+        sd_set_rca(sd, random_rca);
         return sd_r6;
 
     default:
diff --git a/hw/sd/trace-events b/hw/sd/trace-events
index 43eaeba149..6a51b0e906 100644
--- a/hw/sd/trace-events
+++ b/hw/sd/trace-events
@@ -43,6 +43,7 @@  sdcard_response(const char *rspdesc, int rsplen) "%s (sz:%d)"
 sdcard_powerup(void) ""
 sdcard_inquiry_cmd41(void) ""
 sdcard_reset(void) ""
+sdcard_set_rca(uint16_t value) "new RCA: 0x%04x"
 sdcard_set_blocklen(uint16_t length) "block len 0x%03x"
 sdcard_set_block_count(uint32_t cnt) "block cnt 0x%"PRIx32
 sdcard_inserted(bool readonly) "read_only: %u"