Re: [Qemu-devel] [PATCH 03/11] armv7m: QOMify the armv7m container

["Alex Bennée" <alex.bennee@linaro.org>]

Peter Maydell <peter.maydell@linaro.org> writes:

> Create a proper QOM object for the armv7m container, which
> holds the CPU, the NVIC and the bitband regions.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  include/hw/arm/armv7m.h |  51 ++++++++++++++++++
>  hw/arm/armv7m.c         | 140 +++++++++++++++++++++++++++++++++++++++++++-----
>  2 files changed, 179 insertions(+), 12 deletions(-)
>  create mode 100644 include/hw/arm/armv7m.h
>
> diff --git a/include/hw/arm/armv7m.h b/include/hw/arm/armv7m.h
> new file mode 100644
> index 0000000..193ad71
> --- /dev/null
> +++ b/include/hw/arm/armv7m.h
> @@ -0,0 +1,51 @@
> +/*
> + * ARMv7M CPU object
> + *
> + * Copyright (c) 2017 Linaro Ltd
> + * Written by Peter Maydell <peter.maydell@linaro.org>
> + *
> + * This code is licensed under the GPL version 2 or later.
> + */
> +
> +#ifndef HW_ARM_ARMV7M_H
> +#define HW_ARM_ARMV7M_H
> +
> +#include "hw/sysbus.h"
> +#include "hw/arm/armv7m_nvic.h"
> +
> +#define TYPE_BITBAND "ARM,bitband-memory"
> +#define BITBAND(obj) OBJECT_CHECK(BitBandState, (obj), TYPE_BITBAND)
> +
> +typedef struct {
> +    /*< private >*/
> +    SysBusDevice parent_obj;
> +    /*< public >*/
> +
> +    MemoryRegion iomem;
> +    uint32_t base;
> +} BitBandState;
> +
> +#define TYPE_ARMV7M "armv7m"
> +#define ARMV7M(obj) OBJECT_CHECK(ARMv7MState, (obj), TYPE_ARMV7M)
> +
> +#define ARMV7M_NUM_BITBANDS 2
> +
> +/* ARMv7M container object.
> + * + Unnamed GPIO input lines: external IRQ lines for the NVIC
> + * + Named GPIO output SYSRESETREQ: signalled for guest AIRCR.SYSRESETREQ
> + * + Property "cpu-model": CPU model to instantiate
> + * + Property "num-irq": number of external IRQ lines
> + */
> +typedef struct ARMv7MState {
> +    /*< private >*/
> +    SysBusDevice parent_obj;
> +    /*< public >*/
> +    NVICState nvic;
> +    BitBandState bitband[ARMV7M_NUM_BITBANDS];
> +    ARMCPU *cpu;
> +
> +    /* Properties */
> +    char *cpu_model;
> +} ARMv7MState;
> +
> +#endif
> diff --git a/hw/arm/armv7m.c b/hw/arm/armv7m.c
> index b2cc6e9..56d02d4 100644
> --- a/hw/arm/armv7m.c
> +++ b/hw/arm/armv7m.c
> @@ -8,6 +8,7 @@
>   */
>
>  #include "qemu/osdep.h"
> +#include "hw/arm/armv7m.h"
>  #include "qapi/error.h"
>  #include "qemu-common.h"
>  #include "cpu.h"
> @@ -120,18 +121,6 @@ static const MemoryRegionOps bitband_ops = {
>      .endianness = DEVICE_NATIVE_ENDIAN,
>  };
>
> -#define TYPE_BITBAND "ARM,bitband-memory"
> -#define BITBAND(obj) OBJECT_CHECK(BitBandState, (obj), TYPE_BITBAND)
> -
> -typedef struct {
> -    /*< private >*/
> -    SysBusDevice parent_obj;
> -    /*< public >*/
> -
> -    MemoryRegion iomem;
> -    uint32_t base;
> -} BitBandState;
> -
>  static void bitband_init(Object *obj)
>  {
>      BitBandState *s = BITBAND(obj);
> @@ -159,6 +148,132 @@ static void armv7m_bitband_init(void)
>
>  /* Board init.  */
>
> +static const hwaddr bitband_input_addr[ARMV7M_NUM_BITBANDS] = {
> +    0x20000000, 0x40000000
> +};
> +
> +static const hwaddr bitband_output_addr[ARMV7M_NUM_BITBANDS] = {
> +    0x22000000, 0x42000000
> +};
> +
> +static void armv7m_instance_init(Object *obj)
> +{
> +    ARMv7MState *s = ARMV7M(obj);
> +    int i;
> +
> +    /* Can't init the cpu here, we don't yet know which model to use */
> +
> +    object_initialize(&s->nvic, sizeof(s->nvic), "armv7m_nvic");
> +    qdev_set_parent_bus(DEVICE(&s->nvic), sysbus_get_default());
> +    object_property_add_alias(obj, "num-irq",
> +                              OBJECT(&s->nvic), "num-irq", &error_abort);
> +
> +    for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
> +        object_initialize(&s->bitband[i], sizeof(s->bitband[i]), TYPE_BITBAND);
> +        qdev_set_parent_bus(DEVICE(&s->bitband[i]), sysbus_get_default());
> +    }
> +}
> +
> +static void armv7m_realize(DeviceState *dev, Error **errp)
> +{
> +    /* here realize our children */

This comment is a little zen-like. Does this mean the child devices are
realised at this point when the armv7m realise code is run?

> +    ARMv7MState *s = ARMV7M(dev);
> +    Error *err = NULL;
> +    int i;
> +    char **cpustr;
> +    ObjectClass *oc;
> +    const char *typename;
> +    CPUClass *cc;
> +
> +    cpustr = g_strsplit(s->cpu_model, ",", 2);
> +
> +    oc = cpu_class_by_name(TYPE_ARM_CPU, cpustr[0]);
> +    if (!oc) {
> +        error_setg(errp, "Unknown CPU model %s", cpustr[0]);
> +        g_strfreev(cpustr);
> +        return;
> +    }
> +
> +    cc = CPU_CLASS(oc);
> +    typename = object_class_get_name(oc);
> +    cc->parse_features(typename, cpustr[1], &err);
> +    g_strfreev(cpustr);
> +    if (err) {
> +        error_propagate(errp, err);
> +        return;
> +    }
> +
> +    s->cpu = ARM_CPU(object_new(typename));
> +    if (!s->cpu) {
> +        error_setg(errp, "Unknown CPU model %s", s->cpu_model);
> +        return;
> +    }
> +
> +    object_property_set_bool(OBJECT(s->cpu), true, "realized", &err);
> +    if (err != NULL) {
> +        error_propagate(errp, err);
> +        return;
> +    }
> +
> +    /* Note that we must realize the NVIC after the CPU */
> +    object_property_set_bool(OBJECT(&s->nvic), true, "realized", &err);
> +    if (err != NULL) {
> +        error_propagate(errp, err);
> +        return;
> +    }
> +
> +    /* Alias the NVIC's input and output GPIOs as our own so the board
> +     * code can wire them up. (We do this in realize because the
> +     * NVIC doesn't create the input GPIO array until realize.)
> +     */
> +    qdev_pass_gpios(DEVICE(&s->nvic), dev, NULL);
> +    qdev_pass_gpios(DEVICE(&s->nvic), dev, "SYSRESETREQ");
> +
> +    /* Wire the NVIC up to the CPU */
> +    sysbus_connect_irq(SYS_BUS_DEVICE(&s->nvic), 0,
> +                       qdev_get_gpio_in(DEVICE(s->cpu), ARM_CPU_IRQ));
> +    s->cpu->env.nvic = &s->nvic;
> +
> +    for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
> +        Object *obj = OBJECT(&s->bitband[i]);
> +        SysBusDevice *sbd = SYS_BUS_DEVICE(&s->bitband[i]);
> +
> +        object_property_set_int(obj, bitband_input_addr[i], "base", &err);
> +        if (err != NULL) {
> +            error_propagate(errp, err);
> +            return;
> +        }
> +        object_property_set_bool(obj, true, "realized", &err);
> +        if (err != NULL) {
> +            error_propagate(errp, err);
> +            return;
> +        }
> +
> +        sysbus_mmio_map(sbd, 0, bitband_output_addr[i]);
> +    }
> +}
> +
> +static Property armv7m_properties[] = {
> +    DEFINE_PROP_STRING("cpu-model", ARMv7MState, cpu_model),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void armv7m_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +
> +    dc->realize = armv7m_realize;
> +    dc->props = armv7m_properties;
> +}
> +
> +static const TypeInfo armv7m_info = {
> +    .name = TYPE_ARMV7M,
> +    .parent = TYPE_SYS_BUS_DEVICE,
> +    .instance_size = sizeof(ARMv7MState),
> +    .instance_init = armv7m_instance_init,
> +    .class_init = armv7m_class_init,
> +};
> +
>  static void armv7m_reset(void *opaque)
>  {
>      ARMCPU *cpu = opaque;
> @@ -264,6 +379,7 @@ static const TypeInfo bitband_info = {
>  static void armv7m_register_types(void)
>  {
>      type_register_static(&bitband_info);
> +    type_register_static(&armv7m_info);
>  }
>
>  type_init(armv7m_register_types)

Otherwise:

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

--
Alex Bennée