diff options
| -rw-r--r-- | hw/spapr_vty.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/hw/spapr_vty.c b/hw/spapr_vty.c index 8150395..f23cc36 100644 --- a/hw/spapr_vty.c +++ b/hw/spapr_vty.c @@ -69,6 +69,9 @@ static int spapr_vty_init(VIOsPAPRDevice *sdev) return 0; } +/* Forward declaration */ +static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg); + static target_ulong h_put_term_char(CPUState *env, sPAPREnvironment *spapr, target_ulong opcode, target_ulong *args) { @@ -76,9 +79,10 @@ static target_ulong h_put_term_char(CPUState *env, sPAPREnvironment *spapr, target_ulong len = args[1]; target_ulong char0_7 = args[2]; target_ulong char8_15 = args[3]; - VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); + VIOsPAPRDevice *sdev; uint8_t buf[16]; + sdev = vty_lookup(spapr, reg); if (!sdev) { return H_PARAMETER; } @@ -102,9 +106,10 @@ static target_ulong h_get_term_char(CPUState *env, sPAPREnvironment *spapr, target_ulong *len = args + 0; target_ulong *char0_7 = args + 1; target_ulong *char8_15 = args + 2; - VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); + VIOsPAPRDevice *sdev; uint8_t buf[16]; + sdev = vty_lookup(spapr, reg); if (!sdev) { return H_PARAMETER; } @@ -151,6 +156,29 @@ static VIOsPAPRDeviceInfo spapr_vty = { }, }; +static VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg) +{ + VIOsPAPRDevice *sdev; + + sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); + if (!sdev && reg == 0) { + DeviceState *qdev; + + /* Hack for kernel early debug, which always specifies reg==0. + * We search all VIO devices, and grab the first available vty + * device. This attempts to mimic existing PowerVM behaviour + * (early debug does work there, despite having no vty with + * reg==0. */ + QTAILQ_FOREACH(qdev, &spapr->vio_bus->bus.children, sibling) { + if (qdev->info == &spapr_vty.qdev) { + return DO_UPCAST(VIOsPAPRDevice, qdev, qdev); + } + } + } + + return sdev; +} + static void spapr_vty_register(void) { spapr_vio_bus_register_withprop(&spapr_vty); |