1 #include "qemu/osdep.h"
2 #include "qemu/error-report.h"
3 #include "qemu/module.h"
4 #include "qapi/error.h"
6 #include "migration/vmstate.h"
7 #include "chardev/char-fe.h"
9 #include "hw/ppc/spapr.h"
10 #include "hw/ppc/spapr_vio.h"
11 #include "hw/qdev-properties.h"
13 #define VTERM_BUFSIZE 16
15 typedef struct SpaprVioVty
{
19 uint8_t buf
[VTERM_BUFSIZE
];
22 #define TYPE_VIO_SPAPR_VTY_DEVICE "spapr-vty"
23 #define VIO_SPAPR_VTY_DEVICE(obj) \
24 OBJECT_CHECK(SpaprVioVty, (obj), TYPE_VIO_SPAPR_VTY_DEVICE)
26 static int vty_can_receive(void *opaque
)
28 SpaprVioVty
*dev
= VIO_SPAPR_VTY_DEVICE(opaque
);
30 return VTERM_BUFSIZE
- (dev
->in
- dev
->out
);
33 static void vty_receive(void *opaque
, const uint8_t *buf
, int size
)
35 SpaprVioVty
*dev
= VIO_SPAPR_VTY_DEVICE(opaque
);
38 if ((dev
->in
== dev
->out
) && size
) {
39 /* toggle line to simulate edge interrupt */
40 qemu_irq_pulse(spapr_vio_qirq(&dev
->sdev
));
42 for (i
= 0; i
< size
; i
++) {
43 if (dev
->in
- dev
->out
>= VTERM_BUFSIZE
) {
46 error_report("VTY input buffer exhausted - characters dropped."
47 " (input size = %i)", size
);
52 dev
->buf
[dev
->in
++ % VTERM_BUFSIZE
] = buf
[i
];
56 static int vty_getchars(SpaprVioDevice
*sdev
, uint8_t *buf
, int max
)
58 SpaprVioVty
*dev
= VIO_SPAPR_VTY_DEVICE(sdev
);
61 while ((n
< max
) && (dev
->out
!= dev
->in
)) {
63 * Long ago, PowerVM's vty implementation had a bug where it
64 * inserted a \0 after every \r going to the guest. Existing
65 * guests have a workaround for this which removes every \0
66 * immediately following a \r. To avoid triggering this
67 * workaround, we stop before inserting a \0 if the preceding
68 * character in the output buffer is a \r.
70 if (n
> 0 && (buf
[n
- 1] == '\r') &&
71 (dev
->buf
[dev
->out
% VTERM_BUFSIZE
] == '\0')) {
74 buf
[n
++] = dev
->buf
[dev
->out
++ % VTERM_BUFSIZE
];
77 qemu_chr_fe_accept_input(&dev
->chardev
);
82 void vty_putchars(SpaprVioDevice
*sdev
, uint8_t *buf
, int len
)
84 SpaprVioVty
*dev
= VIO_SPAPR_VTY_DEVICE(sdev
);
86 /* XXX this blocks entire thread. Rewrite to use
87 * qemu_chr_fe_write and background I/O callbacks */
88 qemu_chr_fe_write_all(&dev
->chardev
, buf
, len
);
91 static void spapr_vty_realize(SpaprVioDevice
*sdev
, Error
**errp
)
93 SpaprVioVty
*dev
= VIO_SPAPR_VTY_DEVICE(sdev
);
95 if (!qemu_chr_fe_backend_connected(&dev
->chardev
)) {
96 error_setg(errp
, "chardev property not set");
100 qemu_chr_fe_set_handlers(&dev
->chardev
, vty_can_receive
,
101 vty_receive
, NULL
, NULL
, dev
, NULL
, true);
104 /* Forward declaration */
105 static target_ulong
h_put_term_char(PowerPCCPU
*cpu
, SpaprMachineState
*spapr
,
106 target_ulong opcode
, target_ulong
*args
)
108 target_ulong reg
= args
[0];
109 target_ulong len
= args
[1];
110 target_ulong char0_7
= args
[2];
111 target_ulong char8_15
= args
[3];
112 SpaprVioDevice
*sdev
;
115 sdev
= vty_lookup(spapr
, reg
);
124 *((uint64_t *)buf
) = cpu_to_be64(char0_7
);
125 *((uint64_t *)buf
+ 1) = cpu_to_be64(char8_15
);
127 vty_putchars(sdev
, buf
, len
);
132 static target_ulong
h_get_term_char(PowerPCCPU
*cpu
, SpaprMachineState
*spapr
,
133 target_ulong opcode
, target_ulong
*args
)
135 target_ulong reg
= args
[0];
136 target_ulong
*len
= args
+ 0;
137 target_ulong
*char0_7
= args
+ 1;
138 target_ulong
*char8_15
= args
+ 2;
139 SpaprVioDevice
*sdev
;
142 sdev
= vty_lookup(spapr
, reg
);
147 *len
= vty_getchars(sdev
, buf
, sizeof(buf
));
149 memset(buf
+ *len
, 0, 16 - *len
);
152 *char0_7
= be64_to_cpu(*((uint64_t *)buf
));
153 *char8_15
= be64_to_cpu(*((uint64_t *)buf
+ 1));
158 void spapr_vty_create(SpaprVioBus
*bus
, Chardev
*chardev
)
162 dev
= qdev_create(&bus
->bus
, "spapr-vty");
163 qdev_prop_set_chr(dev
, "chardev", chardev
);
164 qdev_init_nofail(dev
);
167 static Property spapr_vty_properties
[] = {
168 DEFINE_SPAPR_PROPERTIES(SpaprVioVty
, sdev
),
169 DEFINE_PROP_CHR("chardev", SpaprVioVty
, chardev
),
170 DEFINE_PROP_END_OF_LIST(),
173 static const VMStateDescription vmstate_spapr_vty
= {
176 .minimum_version_id
= 1,
177 .fields
= (VMStateField
[]) {
178 VMSTATE_SPAPR_VIO(sdev
, SpaprVioVty
),
180 VMSTATE_UINT32(in
, SpaprVioVty
),
181 VMSTATE_UINT32(out
, SpaprVioVty
),
182 VMSTATE_BUFFER(buf
, SpaprVioVty
),
183 VMSTATE_END_OF_LIST()
187 static void spapr_vty_class_init(ObjectClass
*klass
, void *data
)
189 DeviceClass
*dc
= DEVICE_CLASS(klass
);
190 SpaprVioDeviceClass
*k
= VIO_SPAPR_DEVICE_CLASS(klass
);
192 k
->realize
= spapr_vty_realize
;
194 k
->dt_type
= "serial";
195 k
->dt_compatible
= "hvterm1";
196 set_bit(DEVICE_CATEGORY_INPUT
, dc
->categories
);
197 dc
->props
= spapr_vty_properties
;
198 dc
->vmsd
= &vmstate_spapr_vty
;
201 static const TypeInfo spapr_vty_info
= {
202 .name
= TYPE_VIO_SPAPR_VTY_DEVICE
,
203 .parent
= TYPE_VIO_SPAPR_DEVICE
,
204 .instance_size
= sizeof(SpaprVioVty
),
205 .class_init
= spapr_vty_class_init
,
208 SpaprVioDevice
*spapr_vty_get_default(SpaprVioBus
*bus
)
210 SpaprVioDevice
*sdev
, *selected
;
214 * To avoid the console bouncing around we want one VTY to be
215 * the "default". We haven't really got anything to go on, so
216 * arbitrarily choose the one with the lowest reg value.
220 QTAILQ_FOREACH(kid
, &bus
->bus
.children
, sibling
) {
221 DeviceState
*iter
= kid
->child
;
223 /* Only look at VTY devices */
224 if (!object_dynamic_cast(OBJECT(iter
), TYPE_VIO_SPAPR_VTY_DEVICE
)) {
228 sdev
= VIO_SPAPR_DEVICE(iter
);
230 /* First VTY we've found, so it is selected for now */
236 /* Choose VTY with lowest reg value */
237 if (sdev
->reg
< selected
->reg
) {
245 SpaprVioDevice
*vty_lookup(SpaprMachineState
*spapr
, target_ulong reg
)
247 SpaprVioDevice
*sdev
;
249 sdev
= spapr_vio_find_by_reg(spapr
->vio_bus
, reg
);
250 if (!sdev
&& reg
== 0) {
251 /* Hack for kernel early debug, which always specifies reg==0.
252 * We search all VIO devices, and grab the vty with the lowest
253 * reg. This attempts to mimic existing PowerVM behaviour
254 * (early debug does work there, despite having no vty with
256 return spapr_vty_get_default(spapr
->vio_bus
);
259 if (!object_dynamic_cast(OBJECT(sdev
), TYPE_VIO_SPAPR_VTY_DEVICE
)) {
266 static void spapr_vty_register_types(void)
268 spapr_register_hypercall(H_PUT_TERM_CHAR
, h_put_term_char
);
269 spapr_register_hypercall(H_GET_TERM_CHAR
, h_get_term_char
);
270 type_register_static(&spapr_vty_info
);
273 type_init(spapr_vty_register_types
)