hw/misc: implement ESP32-S3 RNG

hw/misc/esp32s3_rng.c

@@ -0,0 +1,56 @@
+/*
+ * ESP32S3 Random Number Generator peripheral
+ *
+ * Copyright (c) 2019-2024 Espressif Systems (Shanghai) Co. Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or
+ * (at your option) any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/error-report.h"
+#include "qemu/guest-random.h"
+#include "qapi/error.h"
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "hw/misc/esp32s3_rng.h"
+
+
+static uint64_t esp32s3_rng_read(void *opaque, hwaddr addr, unsigned int size)
+{
+    uint32_t r = 0;
+    qemu_guest_getrandom_nofail(&r, sizeof(r));
+    return r;
+}
+
+static const MemoryRegionOps esp32s3_rng_ops = {
+    .read =  esp32s3_rng_read,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void esp32s3_rng_init(Object *obj)
+{
+    Esp32s3RngState *s = ESP32S3_RNG(obj);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+
+    memory_region_init_io(&s->iomem, obj, &esp32s3_rng_ops, s,
+                          TYPE_ESP32S3_RNG, sizeof(uint32_t));
+    sysbus_init_mmio(sbd, &s->iomem);
+}
+
+
+static const TypeInfo esp32s3_rng_info = {
+    .name = TYPE_ESP32S3_RNG,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(Esp32s3RngState),
+    .instance_init = esp32s3_rng_init,
+};
+
+static void esp32s3_rng_register_types(void)
+{
+    type_register_static(&esp32s3_rng_info);
+}
+
+type_init(esp32s3_rng_register_types)

hw/misc/meson.build

@@ -165,6 +165,7 @@ system_ss.add(when: 'CONFIG_XTENSA_ESP32S3', if_true: files(
   'esp32s3_sha.c',
   'esp32c3_jtag.c',
   'esp32s3_rtc_cntl.c',
+  'esp32s3_rng.c',
 ))
 
 if gcrypt.found()

include/hw/misc/esp32s3_rng.h

@@ -0,0 +1,27 @@
+/*
+ * ESP32-S3 random number generator
+ *
+ * Copyright (c) 2024 Espressif Systems (Shanghai) Co. Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or
+ * (at your option) any later version.
+ */
+
+#pragma once
+
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+
+#define DR_REG_WDEV_BASE                        0x3ff75000
+
+#define TYPE_ESP32S3_RNG "misc.esp32s3.rng"
+#define ESP32S3_RNG(obj) OBJECT_CHECK(Esp32s3RngState, (obj), TYPE_ESP32S3_RNG)
+
+typedef struct Esp32s3RngState {
+    SysBusDevice parent_obj;
+    MemoryRegion iomem;
+} Esp32s3RngState;
+
+#define ESP32S3_RNG_BASE 0x6003507C//(DR_REG_WDEV_BASE + 0x07c)
+