From: Philippe Mathieu-Daudé <philmd@linaro.org>
Date: Mon, 17 Jun 2024 15:57:54 +0000 (+0200)
Subject: hw/sd/sdcard: Generate random RCA value
X-Git-Tag: v9.1.0-rc0~43^2~12
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6d0dc86070d6b65caaf2c96d7254ead5fc519203;p=thirdparty%2Fqemu.git

hw/sd/sdcard: Generate random RCA value

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>
Tested-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Message-Id: <20240702140842.54242-5-philmd@linaro.org>
---

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 552957b2e57..b1584027049 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"
@@ -515,9 +516,10 @@ 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)
@@ -1212,11 +1214,14 @@ 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 43eaeba1490..6a51b0e9060 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"