1 #include "hw/qdev.h" 2 #include "sysemu/char.h" 3 #include "hw/ppc/spapr.h" 4 #include "hw/ppc/spapr_vio.h" 5 6 #define VTERM_BUFSIZE 16 7 8 typedef struct VIOsPAPRVTYDevice { 9 VIOsPAPRDevice sdev; 10 CharDriverState *chardev; 11 uint32_t in, out; 12 uint8_t buf[VTERM_BUFSIZE]; 13 } VIOsPAPRVTYDevice; 14 15 #define TYPE_VIO_SPAPR_VTY_DEVICE "spapr-vty" 16 #define VIO_SPAPR_VTY_DEVICE(obj) \ 17 OBJECT_CHECK(VIOsPAPRVTYDevice, (obj), TYPE_VIO_SPAPR_VTY_DEVICE) 18 19 static int vty_can_receive(void *opaque) 20 { 21 VIOsPAPRVTYDevice *dev = VIO_SPAPR_VTY_DEVICE(opaque); 22 23 return (dev->in - dev->out) < VTERM_BUFSIZE; 24 } 25 26 static void vty_receive(void *opaque, const uint8_t *buf, int size) 27 { 28 VIOsPAPRVTYDevice *dev = VIO_SPAPR_VTY_DEVICE(opaque); 29 int i; 30 31 if ((dev->in == dev->out) && size) { 32 /* toggle line to simulate edge interrupt */ 33 qemu_irq_pulse(spapr_vio_qirq(&dev->sdev)); 34 } 35 for (i = 0; i < size; i++) { 36 assert((dev->in - dev->out) < VTERM_BUFSIZE); 37 dev->buf[dev->in++ % VTERM_BUFSIZE] = buf[i]; 38 } 39 } 40 41 static int vty_getchars(VIOsPAPRDevice *sdev, uint8_t *buf, int max) 42 { 43 VIOsPAPRVTYDevice *dev = VIO_SPAPR_VTY_DEVICE(sdev); 44 int n = 0; 45 46 while ((n < max) && (dev->out != dev->in)) { 47 buf[n++] = dev->buf[dev->out++ % VTERM_BUFSIZE]; 48 } 49 50 qemu_chr_accept_input(dev->chardev); 51 52 return n; 53 } 54 55 void vty_putchars(VIOsPAPRDevice *sdev, uint8_t *buf, int len) 56 { 57 VIOsPAPRVTYDevice *dev = VIO_SPAPR_VTY_DEVICE(sdev); 58 59 /* FIXME: should check the qemu_chr_fe_write() return value */ 60 qemu_chr_fe_write(dev->chardev, buf, len); 61 } 62 63 static int spapr_vty_init(VIOsPAPRDevice *sdev) 64 { 65 VIOsPAPRVTYDevice *dev = VIO_SPAPR_VTY_DEVICE(sdev); 66 67 if (!dev->chardev) { 68 fprintf(stderr, "spapr-vty: Can't create vty without a chardev!\n"); 69 exit(1); 70 } 71 72 qemu_chr_add_handlers(dev->chardev, vty_can_receive, 73 vty_receive, NULL, dev); 74 75 return 0; 76 } 77 78 /* Forward declaration */ 79 static target_ulong h_put_term_char(PowerPCCPU *cpu, sPAPREnvironment *spapr, 80 target_ulong opcode, target_ulong *args) 81 { 82 target_ulong reg = args[0]; 83 target_ulong len = args[1]; 84 target_ulong char0_7 = args[2]; 85 target_ulong char8_15 = args[3]; 86 VIOsPAPRDevice *sdev; 87 uint8_t buf[16]; 88 89 sdev = vty_lookup(spapr, reg); 90 if (!sdev) { 91 return H_PARAMETER; 92 } 93 94 if (len > 16) { 95 return H_PARAMETER; 96 } 97 98 *((uint64_t *)buf) = cpu_to_be64(char0_7); 99 *((uint64_t *)buf + 1) = cpu_to_be64(char8_15); 100 101 vty_putchars(sdev, buf, len); 102 103 return H_SUCCESS; 104 } 105 106 static target_ulong h_get_term_char(PowerPCCPU *cpu, sPAPREnvironment *spapr, 107 target_ulong opcode, target_ulong *args) 108 { 109 target_ulong reg = args[0]; 110 target_ulong *len = args + 0; 111 target_ulong *char0_7 = args + 1; 112 target_ulong *char8_15 = args + 2; 113 VIOsPAPRDevice *sdev; 114 uint8_t buf[16]; 115 116 sdev = vty_lookup(spapr, reg); 117 if (!sdev) { 118 return H_PARAMETER; 119 } 120 121 *len = vty_getchars(sdev, buf, sizeof(buf)); 122 if (*len < 16) { 123 memset(buf + *len, 0, 16 - *len); 124 } 125 126 *char0_7 = be64_to_cpu(*((uint64_t *)buf)); 127 *char8_15 = be64_to_cpu(*((uint64_t *)buf + 1)); 128 129 return H_SUCCESS; 130 } 131 132 void spapr_vty_create(VIOsPAPRBus *bus, CharDriverState *chardev) 133 { 134 DeviceState *dev; 135 136 dev = qdev_create(&bus->bus, "spapr-vty"); 137 qdev_prop_set_chr(dev, "chardev", chardev); 138 qdev_init_nofail(dev); 139 } 140 141 static Property spapr_vty_properties[] = { 142 DEFINE_SPAPR_PROPERTIES(VIOsPAPRVTYDevice, sdev), 143 DEFINE_PROP_CHR("chardev", VIOsPAPRVTYDevice, chardev), 144 DEFINE_PROP_END_OF_LIST(), 145 }; 146 147 static const VMStateDescription vmstate_spapr_vty = { 148 .name = "spapr_vty", 149 .version_id = 1, 150 .minimum_version_id = 1, 151 .fields = (VMStateField[]) { 152 VMSTATE_SPAPR_VIO(sdev, VIOsPAPRVTYDevice), 153 154 VMSTATE_UINT32(in, VIOsPAPRVTYDevice), 155 VMSTATE_UINT32(out, VIOsPAPRVTYDevice), 156 VMSTATE_BUFFER(buf, VIOsPAPRVTYDevice), 157 VMSTATE_END_OF_LIST() 158 }, 159 }; 160 161 static void spapr_vty_class_init(ObjectClass *klass, void *data) 162 { 163 DeviceClass *dc = DEVICE_CLASS(klass); 164 VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); 165 166 k->init = spapr_vty_init; 167 k->dt_name = "vty"; 168 k->dt_type = "serial"; 169 k->dt_compatible = "hvterm1"; 170 set_bit(DEVICE_CATEGORY_INPUT, dc->categories); 171 dc->props = spapr_vty_properties; 172 dc->vmsd = &vmstate_spapr_vty; 173 } 174 175 static const TypeInfo spapr_vty_info = { 176 .name = TYPE_VIO_SPAPR_VTY_DEVICE, 177 .parent = TYPE_VIO_SPAPR_DEVICE, 178 .instance_size = sizeof(VIOsPAPRVTYDevice), 179 .class_init = spapr_vty_class_init, 180 }; 181 182 VIOsPAPRDevice *spapr_vty_get_default(VIOsPAPRBus *bus) 183 { 184 VIOsPAPRDevice *sdev, *selected; 185 BusChild *kid; 186 187 /* 188 * To avoid the console bouncing around we want one VTY to be 189 * the "default". We haven't really got anything to go on, so 190 * arbitrarily choose the one with the lowest reg value. 191 */ 192 193 selected = NULL; 194 QTAILQ_FOREACH(kid, &bus->bus.children, sibling) { 195 DeviceState *iter = kid->child; 196 197 /* Only look at VTY devices */ 198 if (!object_dynamic_cast(OBJECT(iter), "spapr-vty")) { 199 continue; 200 } 201 202 sdev = VIO_SPAPR_DEVICE(iter); 203 204 /* First VTY we've found, so it is selected for now */ 205 if (!selected) { 206 selected = sdev; 207 continue; 208 } 209 210 /* Choose VTY with lowest reg value */ 211 if (sdev->reg < selected->reg) { 212 selected = sdev; 213 } 214 } 215 216 return selected; 217 } 218 219 VIOsPAPRDevice *vty_lookup(sPAPREnvironment *spapr, target_ulong reg) 220 { 221 VIOsPAPRDevice *sdev; 222 223 sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg); 224 if (!sdev && reg == 0) { 225 /* Hack for kernel early debug, which always specifies reg==0. 226 * We search all VIO devices, and grab the vty with the lowest 227 * reg. This attempts to mimic existing PowerVM behaviour 228 * (early debug does work there, despite having no vty with 229 * reg==0. */ 230 return spapr_vty_get_default(spapr->vio_bus); 231 } 232 233 return sdev; 234 } 235 236 static void spapr_vty_register_types(void) 237 { 238 spapr_register_hypercall(H_PUT_TERM_CHAR, h_put_term_char); 239 spapr_register_hypercall(H_GET_TERM_CHAR, h_get_term_char); 240 type_register_static(&spapr_vty_info); 241 } 242 243 type_init(spapr_vty_register_types) 244