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-rw-r--r--hw/char/sclpconsole.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/hw/char/sclpconsole.c b/hw/char/sclpconsole.c
new file mode 100644
index 0000000000..42ed54c9ab
--- /dev/null
+++ b/hw/char/sclpconsole.c
@@ -0,0 +1,305 @@
+/*
+ * SCLP event type
+ * Ascii Console Data (VT220 Console)
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ * Heinz Graalfs <graalfs@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version. See the COPYING file in the top-level directory.
+ *
+ */
+
+#include <hw/qdev.h>
+#include "qemu/thread.h"
+#include "qemu/error-report.h"
+
+#include "hw/s390x/sclp.h"
+#include "hw/s390x/event-facility.h"
+#include "char/char.h"
+
+typedef struct ASCIIConsoleData {
+ EventBufferHeader ebh;
+ char data[0];
+} QEMU_PACKED ASCIIConsoleData;
+
+/* max size for ASCII data in 4K SCCB page */
+#define SIZE_BUFFER_VT220 4080
+
+typedef struct SCLPConsole {
+ SCLPEvent event;
+ CharDriverState *chr;
+ /* io vector */
+ uint8_t *iov; /* iov buffer pointer */
+ uint8_t *iov_sclp; /* pointer to SCLP read offset */
+ uint8_t *iov_bs; /* pointer byte stream read offset */
+ uint32_t iov_data_len; /* length of byte stream in buffer */
+ uint32_t iov_sclp_rest; /* length of byte stream not read via SCLP */
+ qemu_irq irq_read_vt220;
+} SCLPConsole;
+
+/* character layer call-back functions */
+
+/* Return number of bytes that fit into iov buffer */
+static int chr_can_read(void *opaque)
+{
+ SCLPConsole *scon = opaque;
+
+ return scon->iov ? SIZE_BUFFER_VT220 - scon->iov_data_len : 0;
+}
+
+/* Receive n bytes from character layer, save in iov buffer,
+ * and set event pending */
+static void receive_from_chr_layer(SCLPConsole *scon, const uint8_t *buf,
+ int size)
+{
+ assert(scon->iov);
+
+ /* read data must fit into current buffer */
+ assert(size <= SIZE_BUFFER_VT220 - scon->iov_data_len);
+
+ /* put byte-stream from character layer into buffer */
+ memcpy(scon->iov_bs, buf, size);
+ scon->iov_data_len += size;
+ scon->iov_sclp_rest += size;
+ scon->iov_bs += size;
+ scon->event.event_pending = true;
+}
+
+/* Send data from a char device over to the guest */
+static void chr_read(void *opaque, const uint8_t *buf, int size)
+{
+ SCLPConsole *scon = opaque;
+
+ assert(scon);
+
+ receive_from_chr_layer(scon, buf, size);
+ /* trigger SCLP read operation */
+ qemu_irq_raise(scon->irq_read_vt220);
+}
+
+static void chr_event(void *opaque, int event)
+{
+ SCLPConsole *scon = opaque;
+
+ switch (event) {
+ case CHR_EVENT_OPENED:
+ if (!scon->iov) {
+ scon->iov = g_malloc0(SIZE_BUFFER_VT220);
+ scon->iov_sclp = scon->iov;
+ scon->iov_bs = scon->iov;
+ scon->iov_data_len = 0;
+ scon->iov_sclp_rest = 0;
+ }
+ break;
+ case CHR_EVENT_CLOSED:
+ if (scon->iov) {
+ g_free(scon->iov);
+ scon->iov = NULL;
+ }
+ break;
+ }
+}
+
+/* functions to be called by event facility */
+
+static int event_type(void)
+{
+ return SCLP_EVENT_ASCII_CONSOLE_DATA;
+}
+
+static unsigned int send_mask(void)
+{
+ return SCLP_EVENT_MASK_MSG_ASCII;
+}
+
+static unsigned int receive_mask(void)
+{
+ return SCLP_EVENT_MASK_MSG_ASCII;
+}
+
+/* triggered by SCLP's read_event_data -
+ * copy console data byte-stream into provided (SCLP) buffer
+ */
+static void get_console_data(SCLPEvent *event, uint8_t *buf, size_t *size,
+ int avail)
+{
+ SCLPConsole *cons = DO_UPCAST(SCLPConsole, event, event);
+
+ /* first byte is hex 0 saying an ascii string follows */
+ *buf++ = '\0';
+ avail--;
+ /* if all data fit into provided SCLP buffer */
+ if (avail >= cons->iov_sclp_rest) {
+ /* copy character byte-stream to SCLP buffer */
+ memcpy(buf, cons->iov_sclp, cons->iov_sclp_rest);
+ *size = cons->iov_sclp_rest + 1;
+ cons->iov_sclp = cons->iov;
+ cons->iov_bs = cons->iov;
+ cons->iov_data_len = 0;
+ cons->iov_sclp_rest = 0;
+ event->event_pending = false;
+ /* data provided and no more data pending */
+ } else {
+ /* if provided buffer is too small, just copy part */
+ memcpy(buf, cons->iov_sclp, avail);
+ *size = avail + 1;
+ cons->iov_sclp_rest -= avail;
+ cons->iov_sclp += avail;
+ /* more data pending */
+ }
+}
+
+static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
+ int *slen)
+{
+ int avail;
+ size_t src_len;
+ uint8_t *to;
+ ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr;
+
+ if (!event->event_pending) {
+ /* no data pending */
+ return 0;
+ }
+
+ to = (uint8_t *)&acd->data;
+ avail = *slen - sizeof(ASCIIConsoleData);
+ get_console_data(event, to, &src_len, avail);
+
+ acd->ebh.length = cpu_to_be16(sizeof(ASCIIConsoleData) + src_len);
+ acd->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
+ acd->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
+ *slen = avail - src_len;
+
+ return 1;
+}
+
+/* triggered by SCLP's write_event_data
+ * - write console data to character layer
+ * returns < 0 if an error occurred
+ */
+static ssize_t write_console_data(SCLPEvent *event, const uint8_t *buf,
+ size_t len)
+{
+ ssize_t ret = 0;
+ const uint8_t *iov_offset;
+ SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
+
+ if (!scon->chr) {
+ /* If there's no backend, we can just say we consumed all data. */
+ return len;
+ }
+
+ iov_offset = buf;
+ while (len > 0) {
+ ret = qemu_chr_fe_write(scon->chr, buf, len);
+ if (ret == 0) {
+ /* a pty doesn't seem to be connected - no error */
+ len = 0;
+ } else if (ret == -EAGAIN || (ret > 0 && ret < len)) {
+ len -= ret;
+ iov_offset += ret;
+ } else {
+ len = 0;
+ }
+ }
+
+ return ret;
+}
+
+static int write_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr)
+{
+ int rc;
+ int length;
+ ssize_t written;
+ ASCIIConsoleData *acd = (ASCIIConsoleData *) evt_buf_hdr;
+
+ length = be16_to_cpu(evt_buf_hdr->length) - sizeof(EventBufferHeader);
+ written = write_console_data(event, (uint8_t *)acd->data, length);
+
+ rc = SCLP_RC_NORMAL_COMPLETION;
+ /* set event buffer accepted flag */
+ evt_buf_hdr->flags |= SCLP_EVENT_BUFFER_ACCEPTED;
+
+ /* written will be zero if a pty is not connected - don't treat as error */
+ if (written < 0) {
+ /* event buffer not accepted due to error in character layer */
+ evt_buf_hdr->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
+ rc = SCLP_RC_CONTAINED_EQUIPMENT_CHECK;
+ }
+
+ return rc;
+}
+
+static void trigger_ascii_console_data(void *opaque, int n, int level)
+{
+ sclp_service_interrupt(0);
+}
+
+/* qemu object creation and initialization functions */
+
+/* tell character layer our call-back functions */
+static int console_init(SCLPEvent *event)
+{
+ static bool console_available;
+
+ SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
+
+ if (console_available) {
+ error_report("Multiple VT220 operator consoles are not supported");
+ return -1;
+ }
+ console_available = true;
+ event->event_type = SCLP_EVENT_ASCII_CONSOLE_DATA;
+ if (scon->chr) {
+ qemu_chr_add_handlers(scon->chr, chr_can_read,
+ chr_read, chr_event, scon);
+ }
+ scon->irq_read_vt220 = *qemu_allocate_irqs(trigger_ascii_console_data,
+ NULL, 1);
+
+ return 0;
+}
+
+static int console_exit(SCLPEvent *event)
+{
+ return 0;
+}
+
+static Property console_properties[] = {
+ DEFINE_PROP_CHR("chardev", SCLPConsole, chr),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void console_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SCLPEventClass *ec = SCLP_EVENT_CLASS(klass);
+
+ dc->props = console_properties;
+ ec->init = console_init;
+ ec->exit = console_exit;
+ ec->get_send_mask = send_mask;
+ ec->get_receive_mask = receive_mask;
+ ec->event_type = event_type;
+ ec->read_event_data = read_event_data;
+ ec->write_event_data = write_event_data;
+}
+
+static const TypeInfo sclp_console_info = {
+ .name = "sclpconsole",
+ .parent = TYPE_SCLP_EVENT,
+ .instance_size = sizeof(SCLPConsole),
+ .class_init = console_class_init,
+ .class_size = sizeof(SCLPEventClass),
+};
+
+static void register_types(void)
+{
+ type_register_static(&sclp_console_info);
+}
+
+type_init(register_types)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-23 21:10:05 +0000