Re: [Qemu-devel] [patch 01/02] create empty_slot device

[Anthony Liguori <anthony@codemonkey.ws>]

On 04/16/2010 06:10 PM, Artyom Tarasenko wrote:
> create empty_slot device
>
> The empty_slot device emulates known to a bus but not connected devices.
>
> Signed-off-by: Artyom Tarasenko<atar4qemu@gmail.com>
> ---
>    

What's this for?

Is there a 2/2 missing?

Regards,

Anthony Liguori

>   hw/empty_slot.c |   92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   hw/empty_slot.h |    2 +
>   2 files changed, 94 insertions(+), 0 deletions(-)
>   create mode 100644 hw/empty_slot.c
>   create mode 100644 hw/empty_slot.h
>
> diff --git a/hw/empty_slot.c b/hw/empty_slot.c
> new file mode 100644
> index 0000000..8dc10ac
> --- /dev/null
> +++ b/hw/empty_slot.c
> @@ -0,0 +1,92 @@
> +/*
> + * QEMU Empty Slot
> + *
> + * The empty_slot device emulates known to a bus but not connected devices.
> + *
> + * Copyright (c) 2010 Artyom Tarasenko
> + *
> + * This code is licensed under the GNU GPL v2 or (at your option) any later
> + * version.
> + */
> +
> +#include "hw.h"
> +#include "sysbus.h"
> +#include "empty_slot.h"
> +
> +//#define DEBUG_EMPTY_SLOT
> +
> +#ifdef DEBUG_EMPTY_SLOT
> +#define DPRINTF(fmt, ...)                                       \
> +    do { printf("empty_slot: " fmt , ## __VA_ARGS__); } while (0)
> +#else
> +#define DPRINTF(fmt, ...) do {} while (0)
> +#endif
> +
> +typedef struct EmptySlot {
> +    SysBusDevice busdev;
> +    uint64_t size;
> +} EmptySlot;
> +
> +static uint32_t empty_slot_readl(void *opaque, target_phys_addr_t addr)
> +{
> +    DPRINTF("read from " TARGET_FMT_plx "\n", addr);
> +    return 0;
> +}
> +
> +static void empty_slot_writel(void *opaque, target_phys_addr_t addr,
> +                              uint32_t val)
> +{
> +    DPRINTF("write 0x%x to " TARGET_FMT_plx "\n", val, addr);
> +}
> +
> +CPUReadMemoryFunc * const empty_slot_read[3] = {
> +    empty_slot_readl,
> +    empty_slot_readl,
> +    empty_slot_readl,
> +};
> +
> +static CPUWriteMemoryFunc * const empty_slot_write[3] = {
> +    empty_slot_writel,
> +    empty_slot_writel,
> +    empty_slot_writel,
> +};
> +
> +void empty_slot_init(target_phys_addr_t addr, uint64_t slot_size)
> +{
> +    DeviceState *dev;
> +    SysBusDevice *s;
> +    EmptySlot *e;
> +
> +    dev = qdev_create(NULL, "empty_slot");
> +    s = sysbus_from_qdev(dev);
> +    e = FROM_SYSBUS(EmptySlot, s);
> +    e->size = slot_size;
> +
> +    qdev_init_nofail(dev);
> +
> +    sysbus_mmio_map(s, 0, addr);
> +}
> +
> +static int empty_slot_init1(SysBusDevice *dev)
> +{
> +    EmptySlot *s = FROM_SYSBUS(EmptySlot, dev);
> +    ram_addr_t empty_slot_offset;
> +
> +    empty_slot_offset = cpu_register_io_memory(empty_slot_read,
> +                                               empty_slot_write, s);
> +    sysbus_init_mmio(dev, s->size, empty_slot_offset | IO_MEM_RAM);
> +    return 0;
> +}
> +
> +static SysBusDeviceInfo empty_slot_info = {
> +    .init = empty_slot_init1,
> +    .qdev.name  = "empty_slot",
> +    .qdev.size  = sizeof(EmptySlot),
> +};
> +
> +static void empty_slot_register_devices(void)
> +{
> +    sysbus_register_withprop(&empty_slot_info);
> +}
> +
> +device_init(empty_slot_register_devices);
> diff --git a/hw/empty_slot.h b/hw/empty_slot.h
> new file mode 100644
> index 0000000..377731e
> --- /dev/null
> +++ b/hw/empty_slot.h
> @@ -0,0 +1,2 @@
> +/* empty_slot.c */
> +void empty_slot_init(target_phys_addr_t addr, uint64_t slot_size);
>