diff options
Diffstat (limited to 'hw/char/spapr_vty.c')
| -rw-r--r-- | hw/char/spapr_vty.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/hw/char/spapr_vty.c b/hw/char/spapr_vty.c new file mode 100644 index 0000000000..9df018a230 --- /dev/null +++ b/hw/char/spapr_vty.c @@ -0,0 +1,221 @@ +#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) |