*/
#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "sysemu/char.h"
#include "hw/s390x/3270-ccw.h"
+/* Enough spaces for different window sizes. */
+#define INPUT_BUFFER_SIZE 1000
+/*
+ * 1 for header, 1024*2 for datastream, 2 for tail
+ * Reserve enough spaces for telnet IAC escape.
+ */
+#define OUTPUT_BUFFER_SIZE 2051
+
typedef struct Terminal3270 {
EmulatedCcw3270Device cdev;
+ CharBackend chr;
+ uint8_t inv[INPUT_BUFFER_SIZE];
+ uint8_t outv[OUTPUT_BUFFER_SIZE];
+ int in_len;
+ int out_len;
+ bool handshake_done;
} Terminal3270;
#define TYPE_TERMINAL_3270 "x-terminal3270"
+#define TERMINAL_3270(obj) \
+ OBJECT_CHECK(Terminal3270, (obj), TYPE_TERMINAL_3270)
+
+static int terminal_can_read(void *opaque)
+{
+ Terminal3270 *t = opaque;
+
+ return INPUT_BUFFER_SIZE - t->in_len;
+}
+
+/*
+ * Protocol handshake done,
+ * signal guest by an unsolicited DE irq.
+ */
+static void TN3270_handshake_done(Terminal3270 *t)
+{
+ CcwDevice *ccw_dev = CCW_DEVICE(t);
+ SubchDev *sch = ccw_dev->sch;
+
+ t->handshake_done = true;
+ sch->curr_status.scsw.dstat = SCSW_DSTAT_DEVICE_END;
+ css_conditional_io_interrupt(sch);
+}
+
+/*
+ * Receive inbound data from socket.
+ * For data given to guest, drop the data boundary IAC, IAC_EOR.
+ * TODO:
+ * Using "Reset" key on x3270 may result multiple commands in one packet.
+ * This usually happens when the user meets a poor traffic of the network.
+ * As of now, for such case, we simply terminate the connection,
+ * and we should come back here later with a better solution.
+ */
+static void terminal_read(void *opaque, const uint8_t *buf, int size)
+{
+ Terminal3270 *t = opaque;
+ CcwDevice *ccw_dev = CCW_DEVICE(t);
+ SubchDev *sch = ccw_dev->sch;
+ int end;
+
+ assert(size <= (INPUT_BUFFER_SIZE - t->in_len));
+
+ memcpy(&t->inv[t->in_len], buf, size);
+ t->in_len += size;
+ if (t->in_len < 2) {
+ return;
+ }
+
+ if (!t->handshake_done) {
+ /*
+ * Receiving Terminal Type is the last step of handshake.
+ * The data format: IAC SB Terminal-Type IS <terminal type> IAC SE
+ * The code for Terminal-Type is 0x18, for IS is 0.
+ * Simply check the data format and mark handshake_done.
+ */
+ if (t->in_len > 6 && t->inv[2] == 0x18 && t->inv[3] == 0x0 &&
+ t->inv[t->in_len - 2] == IAC && t->inv[t->in_len - 1] == IAC_SE) {
+ TN3270_handshake_done(t);
+ t->in_len = 0;
+ }
+ return;
+ }
+
+ for (end = 0; end < t->in_len - 1; end++) {
+ if (t->inv[end] == IAC && t->inv[end + 1] == IAC_EOR) {
+ break;
+ }
+ }
+ if (end == t->in_len - 2) {
+ /* Data is valid for consuming. */
+ t->in_len -= 2;
+ sch->curr_status.scsw.dstat = SCSW_DSTAT_ATTENTION;
+ css_conditional_io_interrupt(sch);
+ } else if (end < t->in_len - 2) {
+ /* "Reset" key is used. */
+ qemu_chr_fe_disconnect(&t->chr);
+ } else {
+ /* Gathering data. */
+ return;
+ }
+}
static void terminal_init(EmulatedCcw3270Device *dev, Error **errp)
{
+ Terminal3270 *t = TERMINAL_3270(dev);
static bool terminal_available;
if (terminal_available) {
return;
}
terminal_available = true;
+ qemu_chr_fe_set_handlers(&t->chr, terminal_can_read,
+ terminal_read, NULL, t, NULL, true);
+}
+
+static int read_payload_3270(EmulatedCcw3270Device *dev, uint32_t cda,
+ uint16_t count)
+{
+ Terminal3270 *t = TERMINAL_3270(dev);
+ int len;
+
+ len = MIN(count, t->in_len);
+ cpu_physical_memory_write(cda, t->inv, len);
+ t->in_len -= len;
+
+ return len;
+}
+
+/* TN3270 uses binary transmission, which needs escape IAC to IAC IAC */
+static int insert_IAC_escape_char(uint8_t *outv, int out_len)
+{
+ int IAC_num = 0, new_out_len, i, j;
+
+ for (i = 0; i < out_len; i++) {
+ if (outv[i] == IAC) {
+ IAC_num++;
+ }
+ }
+ if (IAC_num == 0) {
+ return out_len;
+ }
+ new_out_len = out_len + IAC_num;
+ for (i = out_len - 1, j = new_out_len - 1; j > i && i >= 0; i--, j--) {
+ outv[j] = outv[i];
+ if (outv[i] == IAC) {
+ outv[--j] = IAC;
+ }
+ }
+ return new_out_len;
}
+/*
+ * Write 3270 outbound to socket.
+ * Return the count of 3270 data field if succeeded, zero if failed.
+ */
+static int write_payload_3270(EmulatedCcw3270Device *dev, uint8_t cmd,
+ uint32_t cda, uint16_t count)
+{
+ Terminal3270 *t = TERMINAL_3270(dev);
+ int retval = 0;
+
+ assert(count <= (OUTPUT_BUFFER_SIZE - 3) / 2);
+
+ if (!t->handshake_done) {
+ /*
+ * Before having finished 3270 negotiation,
+ * sending outbound data is prohibited.
+ */
+ return 0;
+ }
+ if (!qemu_chr_fe_get_driver(&t->chr)) {
+ /* We just say we consumed all data if there's no backend. */
+ return count;
+ }
+ t->outv[0] = cmd;
+ cpu_physical_memory_read(cda, &t->outv[1], count);
+ t->out_len = count + 1;
+
+ t->out_len = insert_IAC_escape_char(t->outv, t->out_len);
+ t->outv[t->out_len++] = IAC;
+ t->outv[t->out_len++] = IAC_EOR;
+
+ retval = qemu_chr_fe_write_all(&t->chr, t->outv, t->out_len);
+ return (retval <= 0) ? 0 : (retval - 3);
+}
+
+static Property terminal_properties[] = {
+ DEFINE_PROP_CHR("chardev", Terminal3270, chr),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
static void terminal_class_init(ObjectClass *klass, void *data)
{
+ DeviceClass *dc = DEVICE_CLASS(klass);
EmulatedCcw3270Class *ck = EMULATED_CCW_3270_CLASS(klass);
+ dc->props = terminal_properties;
ck->init = terminal_init;
+ ck->read_payload_3270 = read_payload_3270;
+ ck->write_payload_3270 = write_payload_3270;
}
static const TypeInfo ccw_terminal_info = {
#include "hw/s390x/css-bridge.h"
#include "hw/s390x/3270-ccw.h"
+/* Handle READ ccw commands from guest */
+static int handle_payload_3270_read(EmulatedCcw3270Device *dev, CCW1 *ccw)
+{
+ EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
+ CcwDevice *ccw_dev = CCW_DEVICE(dev);
+ int len;
+
+ if (!ccw->cda) {
+ return -EFAULT;
+ }
+
+ len = ck->read_payload_3270(dev, ccw->cda, ccw->count);
+ ccw_dev->sch->curr_status.scsw.count = ccw->count - len;
+
+ return 0;
+}
+
+/* Handle WRITE ccw commands to write data to client */
+static int handle_payload_3270_write(EmulatedCcw3270Device *dev, CCW1 *ccw)
+{
+ EmulatedCcw3270Class *ck = EMULATED_CCW_3270_GET_CLASS(dev);
+ CcwDevice *ccw_dev = CCW_DEVICE(dev);
+ int len;
+
+ if (!ccw->cda) {
+ return -EFAULT;
+ }
+
+ len = ck->write_payload_3270(dev, ccw->cmd_code, ccw->cda, ccw->count);
+
+ if (len <= 0) {
+ return -EIO;
+ }
+
+ ccw_dev->sch->curr_status.scsw.count = ccw->count - len;
+ return 0;
+}
+
+static int emulated_ccw_3270_cb(SubchDev *sch, CCW1 ccw)
+{
+ int rc = 0;
+ EmulatedCcw3270Device *dev = sch->driver_data;
+
+ switch (ccw.cmd_code) {
+ case TC_WRITESF:
+ case TC_WRITE:
+ case TC_EWRITE:
+ case TC_EWRITEA:
+ rc = handle_payload_3270_write(dev, &ccw);
+ break;
+ case TC_RDBUF:
+ case TC_READMOD:
+ rc = handle_payload_3270_read(dev, &ccw);
+ break;
+ default:
+ rc = -ENOSYS;
+ break;
+ }
+
+ if (rc == -EIO) {
+ /* I/O error, specific devices generate specific conditions */
+ SCSW *s = &sch->curr_status.scsw;
+
+ sch->curr_status.scsw.dstat = SCSW_DSTAT_UNIT_CHECK;
+ sch->sense_data[0] = 0x40; /* intervention-req */
+ s->ctrl &= ~SCSW_ACTL_START_PEND;
+ s->ctrl &= ~SCSW_CTRL_MASK_STCTL;
+ s->ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
+ SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
+ }
+
+ return rc;
+}
+
static void emulated_ccw_3270_realize(DeviceState *ds, Error **errp)
{
uint16_t chpid;
sch->id.cu_type = EMULATED_CCW_3270_CU_TYPE;
css_sch_build_virtual_schib(sch, (uint8_t)chpid,
EMULATED_CCW_3270_CHPID_TYPE);
+ sch->ccw_cb = emulated_ccw_3270_cb;
ck->init(dev, &err);
if (err) {
projects / qemu-nvme.git / commitdiff