[Qemu-arm] [RFC PATCH] stm32f103: Add initial skeleton of STM32 F103 SoC

[Priit Laes]

Initial barebone SoC implementation for STM32F103
with "Blue Pill" board source for testing.

Code is based on both nrf51/microbit and stm32f205.

Although code loads and seems to be at the right
addresses it does not yet run:

./arm-softmmu/qemu-system-arm -nographic \
        -machine stm32bluepill \
        -kernel \
        libopencm3-miniblink/bin/stm32/bluepill.bin
QEMU 3.1.50 monitor - type 'help' for more information
(qemu) QEMU 3.1.50 monitor - type 'help' for more information
(qemu) gdbserver
Waiting for gdb connection on device 'tcp::1234'

$ arm-none-eabi-gdb \
        libopencm3-miniblink/bin/stm32/bluepill.elf
(gdb) target remote tcp::1234
Remote debugging using tcp::1234
blocking_handler () at ../../cm3/vector.c:103
103     {
(gdb) bt
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) info line
Line 103 of "../../cm3/vector.c" starts at address 0x8000380 \
        <blocking_handler> and ends at 0x8000382 <null_handler>.

Any ideas?

Signed-off-by: Priit Laes <address@hidden>
---
 default-configs/arm-softmmu.mak |  1 +
 hw/arm/Makefile.objs            |  1 +
 hw/arm/stm32f103_blue_pill.c    | 78 ++++++++++++++++++++++++++++
 hw/arm/stm32f103_soc.c          | 92 +++++++++++++++++++++++++++++++++
 include/hw/arm/stm32f103_soc.h  | 54 +++++++++++++++++++
 5 files changed, 226 insertions(+)
 create mode 100644 hw/arm/stm32f103_blue_pill.c
 create mode 100644 hw/arm/stm32f103_soc.c
 create mode 100644 include/hw/arm/stm32f103_soc.h

diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
index 2420491aac..7a55e523e1 100644
--- a/default-configs/arm-softmmu.mak
+++ b/default-configs/arm-softmmu.mak
@@ -95,6 +95,7 @@ CONFIG_RASPI=y
 CONFIG_REALVIEW=y
 CONFIG_ZAURUS=y
 CONFIG_ZYNQ=y
+CONFIG_STM32F103_SOC=y
 CONFIG_STM32F2XX_TIMER=y
 CONFIG_STM32F2XX_USART=y
 CONFIG_STM32F2XX_SYSCFG=y
diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
index 50c7b4a927..7f59a9349d 100644
--- a/hw/arm/Makefile.objs
+++ b/hw/arm/Makefile.objs
@@ -24,6 +24,7 @@ obj-$(CONFIG_OMAP) += omap1.o omap2.o
 obj-$(CONFIG_STRONGARM) += strongarm.o
 obj-$(CONFIG_ALLWINNER_A10) += allwinner-a10.o cubieboard.o
 obj-$(CONFIG_RASPI) += bcm2835_peripherals.o bcm2836.o raspi.o
+obj-$(CONFIG_STM32F103_SOC) += stm32f103_soc.o stm32f103_blue_pill.o
 obj-$(CONFIG_STM32F205_SOC) += stm32f205_soc.o
 obj-$(CONFIG_XLNX_ZYNQMP_ARM) += xlnx-zynqmp.o xlnx-zcu102.o
 obj-$(CONFIG_XLNX_VERSAL) += xlnx-versal.o xlnx-versal-virt.o
diff --git a/hw/arm/stm32f103_blue_pill.c b/hw/arm/stm32f103_blue_pill.c
new file mode 100644
index 0000000000..09dd69aa71
--- /dev/null
+++ b/hw/arm/stm32f103_blue_pill.c
@@ -0,0 +1,78 @@
+/*
+ * STM32F103C8 Blue Pill development board Machine Model
+ *
+ * Copyright (c) 2018 Priit Laes <address@hidden>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/boards.h"
+#include "hw/arm/arm.h"
+#include "exec/address-spaces.h"
+
+#include "hw/arm/stm32f103_soc.h"
+
+typedef struct {
+    MachineState parent;
+
+    STM32F103State stm32f103;
+} STM32BluePillMachineState;
+
+#define TYPE_STM32BLUEPILL_MACHINE MACHINE_TYPE_NAME("stm32bluepill")
+
+#define STM32BLUEPILL_MACHINE(obj) \
+    OBJECT_CHECK(STM32BluePillMachineState, obj, TYPE_STM32BLUEPILL_MACHINE)
+
+static void stm32bluepill_init(MachineState *machine)
+{
+    STM32BluePillMachineState *s = STM32BLUEPILL_MACHINE(machine);
+    Object *soc = OBJECT(&s->stm32f103);
+
+    sysbus_init_child_obj(OBJECT(machine), "stm32f103-soc", soc,
+                          sizeof(s->stm32f103), TYPE_STM32F103_SOC);
+    object_property_set_bool(soc, true, "realized", &error_fatal);
+
+    armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename,
+                       FLASH_SIZE);
+}
+
+static void stm32bluepill_machine_class_init(ObjectClass *oc, void *data)
+{
+    MachineClass *mc = MACHINE_CLASS(oc);
+
+    mc->desc = "STM32F103 Blue Pill development board";
+    mc->init = stm32bluepill_init;
+    mc->max_cpus = 1;
+}
+
+static const TypeInfo stm32bluepill_info = {
+    .name = TYPE_STM32BLUEPILL_MACHINE,
+    .parent = TYPE_MACHINE,
+    .instance_size = sizeof(STM32BluePillMachineState),
+    .class_init = stm32bluepill_machine_class_init,
+};
+
+static void stm32bluepill_machine_init(void)
+{
+    type_register_static(&stm32bluepill_info);
+}
+
+type_init(stm32bluepill_machine_init);
diff --git a/hw/arm/stm32f103_soc.c b/hw/arm/stm32f103_soc.c
new file mode 100644
index 0000000000..3093bce4ea
--- /dev/null
+++ b/hw/arm/stm32f103_soc.c
@@ -0,0 +1,92 @@
+/*
+ * STM32 F103 SoC (or MCU)
+ *
+ * Copyright 2018 Priit Laes <address@hidden>
+ *
+ * This code is licensed under the GPL version 2 or later.  See
+ * the COPYING file in the top-level directory.
+ */
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "exec/address-spaces.h"
+
+#include "hw/arm/stm32f103_soc.h"
+
+#define FLASH_BASE      0x08000000
+#define SRAM_BASE       0x20000000
+
+static void stm32f103_soc_init(Object *obj)
+{
+    STM32F103State *s = STM32F103_SOC(obj);
+
+    sysbus_init_child_obj(obj, "armv7m", &s->cpu, sizeof(s->cpu),
+                      TYPE_ARMV7M);
+}
+
+static void stm32f103_soc_realize(DeviceState *dev_soc, Error **errp)
+{
+    STM32F103State *s = STM32F103_SOC(dev_soc);
+    Error *err = NULL;
+
+    /*
+     * XXX: Region 0x1FFF F000 - 0x1FFF F7FF is called "System Memory"
+     * containing boot loader used to reprogram flash by using USART1.
+     */
+    MemoryRegion *system_memory = get_system_memory();
+
+    memory_region_init_rom(&s->flash, NULL, "stm32.flash", FLASH_SIZE,
+                           &error_fatal);
+    memory_region_add_subregion(system_memory, FLASH_BASE, &s->flash);
+    /*
+     * TODO: based on BOOT pin, 0x00000000 - 0x0007FFFF is aliased to
+     * either Flash or system memory. We currently hardcode it to flash.
+     */
+    memory_region_init_alias(&s->flash_alias, NULL, "stm32.flash_alias",
+                             &s->flash, 0, FLASH_SIZE);
+    memory_region_add_subregion(system_memory, 0, &s->flash_alias);
+
+    memory_region_init_ram(&s->sram, NULL, "stm32.sram", SRAM_SIZE,
+                           &error_fatal);
+    memory_region_add_subregion(system_memory, SRAM_BASE, &s->sram);
+
+    qdev_prop_set_bit(DEVICE(&s->cpu), "enable-bitband", true);
+    qdev_prop_set_uint32(DEVICE(&s->cpu), "num-irq", 80);
+    qdev_prop_set_string(DEVICE(&s->cpu), "cpu-type", 
ARM_CPU_TYPE_NAME("cortex-m3"));
+
+    object_property_set_link(OBJECT(&s->cpu), OBJECT(system_memory),
+                                    "memory", &error_abort);
+    object_property_set_bool(OBJECT(&s->cpu), true, "realized", &err);
+    if (err != NULL) {
+        error_propagate(errp, err);
+        return;
+    }
+}
+
+static Property stm32f103_soc_properties[] = {
+    DEFINE_PROP_UINT32("flash-size", STM32F103State, flash_size, FLASH_SIZE),
+    DEFINE_PROP_UINT32("sram-size", STM32F103State, sram_size, SRAM_SIZE),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void stm32f103_soc_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->props   = stm32f103_soc_properties;
+    dc->realize = stm32f103_soc_realize;
+}
+
+static const TypeInfo stm32f103_soc_info = {
+    .name          = TYPE_STM32F103_SOC,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(STM32F103State),
+    .instance_init = stm32f103_soc_init,
+    .class_init    = stm32f103_soc_class_init,
+};
+
+static void stm32f103_soc_types(void)
+{
+    type_register_static(&stm32f103_soc_info);
+}
+type_init(stm32f103_soc_types)
diff --git a/include/hw/arm/stm32f103_soc.h b/include/hw/arm/stm32f103_soc.h
new file mode 100644
index 0000000000..d6b2eb9c57
--- /dev/null
+++ b/include/hw/arm/stm32f103_soc.h
@@ -0,0 +1,54 @@
+/*
+ * STM32 F103 SoC (or MCU)
+ *
+ * Copyright (c) 2018 Priit Laes <address@hidden>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef HW_ARM_STM32F103_SOC_H
+#define HW_ARM_STM32F103_SOC_H
+
+#include "hw/arm/armv7m.h"
+
+#define TYPE_STM32F103_SOC "stm32f103-soc"
+#define STM32F103_SOC(obj) \
+    OBJECT_CHECK(STM32F103State, (obj), TYPE_STM32F103_SOC)
+
+/* TODO: flash/sram sizes are for STM32F103C8 part. */
+#define FLASH_SIZE     (64 * 1024)
+#define SRAM_SIZE      (20 * 1024)
+
+typedef struct STM32F103State {
+    SysBusDevice parent_obj;
+
+    ARMv7MState cpu;
+
+    uint32_t sram_size;
+    uint32_t flash_size;
+    MemoryRegion sram;
+    MemoryRegion flash;
+    /* XXX: find better name */
+    MemoryRegion flash_alias;
+
+    /* TODO: Peripherals */
+
+} STM32F103State;
+
+#endif /* HW_ARM_STM32F103_SOC_H */
-- 
2.20.1