Archipelago » qemu

#include "hw/qdev.h"

#include "char/char.h"

#include "hw/ppc/spapr.h"

#include "hw/ppc/spapr_vio.h"

#define VTERM_BUFSIZE   16

typedef struct VIOsPAPRVTYDevice {

    VIOsPAPRDevice sdev;

    CharDriverState *chardev;

    uint32_t in, out;

    uint8_t buf[VTERM_BUFSIZE];

} VIOsPAPRVTYDevice;

static int vty_can_receive(void *opaque)

{

    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;

    return (dev->in - dev->out) < VTERM_BUFSIZE;

}

static void vty_receive(void *opaque, const uint8_t *buf, int size)

{

    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)opaque;

    int i;

    if ((dev->in == dev->out) && size) {

        /* toggle line to simulate edge interrupt */

        qemu_irq_pulse(spapr_vio_qirq(&dev->sdev));

    }

    for (i = 0; i < size; i++) {

        assert((dev->in - dev->out) < VTERM_BUFSIZE);

        dev->buf[dev->in++ % VTERM_BUFSIZE] = buf[i];

    }

}

static int vty_getchars(VIOsPAPRDevice *sdev, uint8_t *buf, int max)

{

    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;

    int n = 0;

    while ((n < max) && (dev->out != dev->in)) {

        buf[n++] = dev->buf[dev->out++ % VTERM_BUFSIZE];

    }

    return n;

}

void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len)

{

    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;

    /* FIXME: should check the qemu_chr_fe_write() return value */

    qemu_chr_fe_write(dev->chardev, buf, len);

}

static int spapr_vty_init(VIOsPAPRDevice *sdev)

{

    VIOsPAPRVTYDevice *dev = (VIOsPAPRVTYDevice *)sdev;

    if (!dev->chardev) {

        fprintf(stderr, "spapr-vty: Can't create vty without a chardev!\n");

        exit(1);

    }

    qemu_chr_add_handlers(dev->chardev, vty_can_receive,

                          vty_receive, NULL, dev);

    return 0;

}

/* Forward declaration */

static target_ulong h_put_term_char(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                                    target_ulong opcode, target_ulong *args)

{

    target_ulong reg = args[0];

    target_ulong len = args[1];

    target_ulong char0_7 = args[2];

    target_ulong char8_15 = args[3];

    VIOsPAPRDevice *sdev;

    uint8_t buf[16];

    sdev = vty_lookup(spapr, reg);

    if (!sdev) {

        return H_PARAMETER;

    }

    if (len > 16) {

        return H_PARAMETER;

    }

    *((uint64_t *)buf) = cpu_to_be64(char0_7);

    *((uint64_t *)buf + 1) = cpu_to_be64(char8_15);

    vty_putchars(sdev, buf, len);

    return H_SUCCESS;

}

static target_ulong h_get_term_char(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                                    target_ulong opcode, target_ulong *args)

{

    target_ulong reg = args[0];

    target_ulong *len = args + 0;

    target_ulong *char0_7 = args + 1;

    target_ulong *char8_15 = args + 2;

    VIOsPAPRDevice *sdev;

    uint8_t buf[16];

    sdev = vty_lookup(spapr, reg);

    if (!sdev) {

        return H_PARAMETER;

    }

    *len = vty_getchars(sdev, buf, sizeof(buf));

    if (*len < 16) {

        memset(buf + *len, 0, 16 - *len);

    }

    *char0_7 = be64_to_cpu(*((uint64_t *)buf));

    *char8_15 = be64_to_cpu(*((uint64_t *)buf + 1));

    return H_SUCCESS;

}

void spapr_vty_create(VIOsPAPRBus *bus, CharDriverState *chardev)

{

    DeviceState *dev;

    dev = qdev_create(&bus->bus, "spapr-vty");

    qdev_prop_set_chr(dev, "chardev", chardev);

    qdev_init_nofail(dev);

}

static Property spapr_vty_properties[] = {

    DEFINE_SPAPR_PROPERTIES(VIOsPAPRVTYDevice, sdev),

    DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev),

    DEFINE_PROP_END_OF_LIST(),

};

static void spapr_vty_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);

    k->init = spapr_vty_init;

    k->dt_name = "vty";

    k->dt_type = "serial";

    k->dt_compatible = "hvterm1";

    dc->props = spapr_vty_properties;

}

static const TypeInfo spapr_vty_info = {

    .name          = "spapr-vty",

    .parent        = TYPE_VIO_SPAPR_DEVICE,

    .instance_size = sizeof(VIOsPAPRVTYDevice),

    .class_init    = spapr_vty_class_init,

};

VIOsPAPRDevice *spapr_vty_get_default(VIOsPAPRBus *bus)

{

    VIOsPAPRDevice *sdev, *selected;

    BusChild *kid;

    /*

     * To avoid the console bouncing around we want one VTY to be

     * the "default". We haven't really got anything to go on, so

     * arbitrarily choose the one with the lowest reg value.

     */

    selected = NULL;

    QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {

        DeviceState *iter = kid->child;

        /* Only look at VTY devices */

        if (!object_dynamic_cast(OBJECT(iter), "spapr-vty")) {

            continue;

        }

        sdev = DO_UPCAST(VIOsPAPRDevice, qdev, iter);

        /* First VTY we've found, so it is selected for now */

        if (!selected) {

            selected = sdev;

            continue;

        }

        /* Choose VTY with lowest reg value */

        if (sdev->reg < selected->reg) {

            selected = sdev;

        }

    }

    return selected;

}

VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg)

{

    VIOsPAPRDevice *sdev;

    sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);

    if (!sdev && reg == 0) {

        /* Hack for kernel early debug, which always specifies reg==0.

         * We search all VIO devices, and grab the vty with the lowest

         * reg.  This attempts to mimic existing PowerVM behaviour

         * (early debug does work there, despite having no vty with

         * reg==0. */

        return spapr_vty_get_default(spapr->vio_bus);

    }

    return sdev;

}

static void spapr_vty_register_types(void)

{

    spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char);

    spapr_register_hypercall(H_GET_TERM_CHAR, h_get_term_char);

    type_register_static(&spapr_vty_info);

}

type_init(spapr_vty_register_types)