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-rw-r--r--hw/char/sclpconsole.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/hw/char/sclpconsole.c b/hw/char/sclpconsole.c
new file mode 100644
index 00000000..b014c7f5
--- /dev/null
+++ b/hw/char/sclpconsole.c
@@ -0,0 +1,285 @@
+/*
+ * 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 "sysemu/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;
+ uint8_t iov[SIZE_BUFFER_VT220];
+ uint32_t iov_sclp; /* offset in buf for SCLP read operation */
+ uint32_t iov_bs; /* offset in buf for char layer read operation */
+ uint32_t iov_data_len; /* length of byte stream in buffer */
+ uint32_t iov_sclp_rest; /* length of byte stream not read via SCLP */
+ bool notify; /* qemu_notify_event() req'd if true */
+} 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;
+ int avail = SIZE_BUFFER_VT220 - scon->iov_data_len;
+
+ if (avail == 0) {
+ scon->notify = true;
+ }
+ return avail;
+}
+
+/* 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);
+ /* 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[scon->iov_bs], buf, size);
+ scon->iov_data_len += size;
+ scon->iov_sclp_rest += size;
+ scon->iov_bs += size;
+ scon->event.event_pending = true;
+ sclp_service_interrupt(0);
+}
+
+/* functions to be called by event facility */
+
+static bool can_handle_event(uint8_t type)
+{
+ return type == 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[cons->iov_sclp], cons->iov_sclp_rest);
+ *size = cons->iov_sclp_rest + 1;
+ cons->iov_sclp = 0;
+ cons->iov_bs = 0;
+ 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[cons->iov_sclp], avail);
+ *size = avail + 1;
+ cons->iov_sclp_rest -= avail;
+ cons->iov_sclp += avail;
+ /* more data pending */
+ }
+ if (cons->notify) {
+ cons->notify = false;
+ qemu_notify_event();
+ }
+}
+
+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)
+{
+ 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;
+ }
+
+ return qemu_chr_fe_write_all(scon->chr, buf, len);
+}
+
+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 const VMStateDescription vmstate_sclpconsole = {
+ .name = "sclpconsole",
+ .version_id = 0,
+ .minimum_version_id = 0,
+ .fields = (VMStateField[]) {
+ VMSTATE_BOOL(event.event_pending, SCLPConsole),
+ VMSTATE_UINT8_ARRAY(iov, SCLPConsole, SIZE_BUFFER_VT220),
+ VMSTATE_UINT32(iov_sclp, SCLPConsole),
+ VMSTATE_UINT32(iov_bs, SCLPConsole),
+ VMSTATE_UINT32(iov_data_len, SCLPConsole),
+ VMSTATE_UINT32(iov_sclp_rest, SCLPConsole),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+/* 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;
+ if (scon->chr) {
+ qemu_chr_add_handlers(scon->chr, chr_can_read,
+ chr_read, NULL, scon);
+ }
+
+ return 0;
+}
+
+static void console_reset(DeviceState *dev)
+{
+ SCLPEvent *event = SCLP_EVENT(dev);
+ SCLPConsole *scon = DO_UPCAST(SCLPConsole, event, event);
+
+ event->event_pending = false;
+ scon->iov_sclp = 0;
+ scon->iov_bs = 0;
+ scon->iov_data_len = 0;
+ scon->iov_sclp_rest = 0;
+ scon->notify = false;
+}
+
+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;
+ dc->reset = console_reset;
+ dc->vmsd = &vmstate_sclpconsole;
+ ec->init = console_init;
+ ec->exit = console_exit;
+ ec->get_send_mask = send_mask;
+ ec->get_receive_mask = receive_mask;
+ ec->can_handle_event = can_handle_event;
+ ec->read_event_data = read_event_data;
+ ec->write_event_data = write_event_data;
+ set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
+}
+
+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 2.25.1) at 2024-06-02 12:48:17 +0000