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130c57c0 HG |
1 | /* |
2 | * SCLP event type | |
3 | * Ascii Console Data (VT220 Console) | |
4 | * | |
5 | * Copyright IBM, Corp. 2012 | |
6 | * | |
7 | * Authors: | |
8 | * Heinz Graalfs <graalfs@de.ibm.com> | |
9 | * | |
10 | * This work is licensed under the terms of the GNU GPL, version 2 or (at your | |
11 | * option) any later version. See the COPYING file in the top-level directory. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <hw/qdev.h> | |
16 | #include "qemu-thread.h" | |
17 | ||
18 | #include "sclp.h" | |
19 | #include "event-facility.h" | |
20 | ||
21 | typedef struct ASCIIConsoleData { | |
22 | EventBufferHeader ebh; | |
23 | char data[0]; | |
24 | } QEMU_PACKED ASCIIConsoleData; | |
25 | ||
26 | /* max size for ASCII data in 4K SCCB page */ | |
27 | #define SIZE_BUFFER_VT220 4080 | |
28 | ||
29 | typedef struct SCLPConsole { | |
30 | SCLPEvent event; | |
31 | CharDriverState *chr; | |
32 | /* io vector */ | |
33 | uint8_t *iov; /* iov buffer pointer */ | |
34 | uint8_t *iov_sclp; /* pointer to SCLP read offset */ | |
35 | uint8_t *iov_bs; /* pointer byte stream read offset */ | |
36 | uint32_t iov_data_len; /* length of byte stream in buffer */ | |
37 | uint32_t iov_sclp_rest; /* length of byte stream not read via SCLP */ | |
38 | qemu_irq irq_read_vt220; | |
39 | } SCLPConsole; | |
40 | ||
41 | /* character layer call-back functions */ | |
42 | ||
43 | /* Return number of bytes that fit into iov buffer */ | |
44 | static int chr_can_read(void *opaque) | |
45 | { | |
46 | int can_read; | |
47 | SCLPConsole *scon = opaque; | |
48 | ||
49 | can_read = SIZE_BUFFER_VT220 - scon->iov_data_len; | |
50 | ||
51 | return can_read; | |
52 | } | |
53 | ||
54 | /* Receive n bytes from character layer, save in iov buffer, | |
55 | * and set event pending */ | |
56 | static void receive_from_chr_layer(SCLPConsole *scon, const uint8_t *buf, | |
57 | int size) | |
58 | { | |
59 | assert(scon->iov); | |
60 | ||
61 | /* read data must fit into current buffer */ | |
62 | assert(size <= SIZE_BUFFER_VT220 - scon->iov_data_len); | |
63 | ||
64 | /* put byte-stream from character layer into buffer */ | |
65 | memcpy(scon->iov_bs, buf, size); | |
66 | scon->iov_data_len += size; | |
67 | scon->iov_sclp_rest += size; | |
68 | scon->iov_bs += size; | |
69 | scon->event.event_pending = true; | |
70 | } | |
71 | ||
72 | /* Send data from a char device over to the guest */ | |
73 | static void chr_read(void *opaque, const uint8_t *buf, int size) | |
74 | { | |
75 | SCLPConsole *scon = opaque; | |
76 | ||
77 | assert(scon); | |
78 | ||
79 | receive_from_chr_layer(scon, buf, size); | |
80 | /* trigger SCLP read operation */ | |
81 | qemu_irq_raise(scon->irq_read_vt220); | |
82 | } | |
83 | ||
84 | static void chr_event(void *opaque, int event) | |
85 | { | |
86 | SCLPConsole *scon = opaque; | |
87 | ||
88 | switch (event) { | |
89 | case CHR_EVENT_OPENED: | |
90 | if (!scon->iov) { | |
91 | scon->iov = g_malloc0(SIZE_BUFFER_VT220); | |
92 | scon->iov_sclp = scon->iov; | |
93 | scon->iov_bs = scon->iov; | |
94 | scon->iov_data_len = 0; | |
95 | scon->iov_sclp_rest = 0; | |
96 | } | |
97 | break; | |
98 | case CHR_EVENT_CLOSED: | |
99 | if (scon->iov) { | |
100 | g_free(scon->iov); | |
101 | scon->iov = NULL; | |
102 | } | |
103 | break; | |
104 | } | |
105 | } | |
106 | ||
107 | /* functions to be called by event facility */ | |
108 | ||
109 | static int event_type(void) | |
110 | { | |
111 | return SCLP_EVENT_ASCII_CONSOLE_DATA; | |
112 | } | |
113 | ||
114 | static unsigned int send_mask(void) | |
115 | { | |
116 | return SCLP_EVENT_MASK_MSG_ASCII; | |
117 | } | |
118 | ||
119 | static unsigned int receive_mask(void) | |
120 | { | |
121 | return SCLP_EVENT_MASK_MSG_ASCII; | |
122 | } | |
123 | ||
124 | /* triggered by SCLP's read_event_data - | |
125 | * copy console data byte-stream into provided (SCLP) buffer | |
126 | */ | |
127 | static void get_console_data(SCLPEvent *event, uint8_t *buf, size_t *size, | |
128 | int avail) | |
129 | { | |
130 | SCLPConsole *cons = DO_UPCAST(SCLPConsole, event, event); | |
131 | ||
132 | /* first byte is hex 0 saying an ascii string follows */ | |
133 | *buf++ = '\0'; | |
134 | avail--; | |
135 | /* if all data fit into provided SCLP buffer */ | |
136 | if (avail >= cons->iov_sclp_rest) { | |
137 | /* copy character byte-stream to SCLP buffer */ | |
138 | memcpy(buf, cons->iov_sclp, cons->iov_sclp_rest); | |
139 | *size = cons->iov_sclp_rest + 1; | |
140 | cons->iov_sclp = cons->iov; | |
141 | cons->iov_bs = cons->iov; | |
142 | cons->iov_data_len = 0; | |
143 | cons->iov_sclp_rest = 0; | |
144 | event->event_pending = false; | |
145 | /* data provided and no more data pending */ | |
146 | } else { | |
147 | /* if provided buffer is too small, just copy part */ | |
148 | memcpy(buf, cons->iov_sclp, avail); | |
149 | *size = avail + 1; | |
150 | cons->iov_sclp_rest -= avail; | |
151 | cons->iov_sclp += avail; | |
152 | /* more data pending */ | |
153 | } | |
154 | } | |
155 | ||
156 | static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr, | |
157 | int *slen) | |
158 | { | |
159 | int avail; | |
160 | size_t src_len; | |
161 | uint8_t *to; | |
162 | ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr; | |
163 | ||
164 | if (!event->event_pending) { | |
165 | /* no data pending */ | |
166 | return 0; | |
167 | } | |
168 | ||
169 | to = (uint8_t *)&acd->data; | |
170 | avail = *slen - sizeof(ASCIIConsoleData); | |
171 | get_console_data(event, to, &src_len, avail); | |
172 | ||
173 | acd->ebh.length = cpu_to_be16(sizeof(ASCIIConsoleData) + src_len); | |
174 | acd->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA; | |
175 | acd->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED; | |
176 | *slen = avail - src_len; | |
177 | ||
178 | return 1; | |
179 | } | |
180 | ||
181 | /* triggered by SCLP's write_event_data | |
8367a14f SW |
182 | * - write console data to character layer |
183 | * returns < 0 if an error occurred | |
130c57c0 HG |
184 | */ |
185 | static ssize_t write_console_data(SCLPEvent *event, const uint8_t *buf, | |
186 | size_t len) | |
187 | { | |
188 | ssize_t ret = 0; | |
189 | const uint8_t *iov_offset; | |
190 | SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event); | |
191 | ||
192 | if (!scon->chr) { | |
193 | /* If there's no backend, we can just say we consumed all data. */ | |
194 | return len; | |
195 | } | |
196 | ||
197 | iov_offset = buf; | |
198 | while (len > 0) { | |
199 | ret = qemu_chr_fe_write(scon->chr, buf, len); | |
200 | if (ret == 0) { | |
201 | /* a pty doesn't seem to be connected - no error */ | |
202 | len = 0; | |
203 | } else if (ret == -EAGAIN || (ret > 0 && ret < len)) { | |
204 | len -= ret; | |
205 | iov_offset += ret; | |
206 | } else { | |
207 | len = 0; | |
208 | } | |
209 | } | |
210 | ||
211 | return ret; | |
212 | } | |
213 | ||
214 | static int write_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr) | |
215 | { | |
216 | int rc; | |
217 | int length; | |
218 | ssize_t written; | |
219 | ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr; | |
220 | ||
221 | length = be16_to_cpu(evt_buf_hdr->length) - sizeof(EventBufferHeader); | |
222 | written = write_console_data(event, (uint8_t *)acd->data, length); | |
223 | ||
224 | rc = SCLP_RC_NORMAL_COMPLETION; | |
225 | /* set event buffer accepted flag */ | |
226 | evt_buf_hdr->flags |= SCLP_EVENT_BUFFER_ACCEPTED; | |
227 | ||
228 | /* written will be zero if a pty is not connected - don't treat as error */ | |
229 | if (written < 0) { | |
230 | /* event buffer not accepted due to error in character layer */ | |
231 | evt_buf_hdr->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED); | |
232 | rc = SCLP_RC_CONTAINED_EQUIPMENT_CHECK; | |
233 | } | |
234 | ||
235 | return rc; | |
236 | } | |
237 | ||
238 | static void trigger_ascii_console_data(void *env, int n, int level) | |
239 | { | |
240 | sclp_service_interrupt(0); | |
241 | } | |
242 | ||
243 | /* qemu object creation and initialization functions */ | |
244 | ||
245 | /* tell character layer our call-back functions */ | |
246 | static int console_init(SCLPEvent *event) | |
247 | { | |
248 | static bool console_available; | |
249 | ||
250 | SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event); | |
251 | ||
252 | if (console_available) { | |
253 | error_report("Multiple VT220 operator consoles are not supported"); | |
254 | return -1; | |
255 | } | |
256 | console_available = true; | |
257 | event->event_type = SCLP_EVENT_ASCII_CONSOLE_DATA; | |
258 | if (scon->chr) { | |
259 | qemu_chr_add_handlers(scon->chr, chr_can_read, | |
260 | chr_read, chr_event, scon); | |
261 | } | |
262 | scon->irq_read_vt220 = *qemu_allocate_irqs(trigger_ascii_console_data, | |
263 | NULL, 1); | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | static int console_exit(SCLPEvent *event) | |
269 | { | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static Property console_properties[] = { | |
274 | DEFINE_PROP_CHR("chardev", SCLPConsole, chr), | |
275 | DEFINE_PROP_END_OF_LIST(), | |
276 | }; | |
277 | ||
278 | static void console_class_init(ObjectClass *klass, void *data) | |
279 | { | |
280 | DeviceClass *dc = DEVICE_CLASS(klass); | |
281 | SCLPEventClass *ec = SCLP_EVENT_CLASS(klass); | |
282 | ||
283 | dc->props = console_properties; | |
284 | ec->init = console_init; | |
285 | ec->exit = console_exit; | |
286 | ec->get_send_mask = send_mask; | |
287 | ec->get_receive_mask = receive_mask; | |
288 | ec->event_type = event_type; | |
289 | ec->read_event_data = read_event_data; | |
290 | ec->write_event_data = write_event_data; | |
291 | } | |
292 | ||
293 | static TypeInfo sclp_console_info = { | |
294 | .name = "sclpconsole", | |
295 | .parent = TYPE_SCLP_EVENT, | |
296 | .instance_size = sizeof(SCLPConsole), | |
297 | .class_init = console_class_init, | |
298 | .class_size = sizeof(SCLPEventClass), | |
299 | }; | |
300 | ||
301 | static void register_types(void) | |
302 | { | |
303 | type_register_static(&sclp_console_info); | |
304 | } | |
305 | ||
306 | type_init(register_types) |