summaryrefslogtreecommitdiff
path: root/hw/xen_console.c
diff options
context:
space:
mode:
Diffstat (limited to 'hw/xen_console.c')
-rw-r--r--hw/xen_console.c305
1 files changed, 0 insertions, 305 deletions
diff --git a/hw/xen_console.c b/hw/xen_console.c
deleted file mode 100644
index c56ef4737f..0000000000
--- a/hw/xen_console.c
+++ /dev/null
@@ -1,305 +0,0 @@
-/*
- * Copyright (C) International Business Machines Corp., 2005
- * Author(s): Anthony Liguori <aliguori@us.ibm.com>
- *
- * Copyright (C) Red Hat 2007
- *
- * Xen Console
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; under version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <sys/select.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <termios.h>
-#include <stdarg.h>
-#include <sys/mman.h>
-
-#include "hw/hw.h"
-#include "char/char.h"
-#include "hw/xen_backend.h"
-
-#include <xen/io/console.h>
-
-struct buffer {
- uint8_t *data;
- size_t consumed;
- size_t size;
- size_t capacity;
- size_t max_capacity;
-};
-
-struct XenConsole {
- struct XenDevice xendev; /* must be first */
- struct buffer buffer;
- char console[XEN_BUFSIZE];
- int ring_ref;
- void *sring;
- CharDriverState *chr;
- int backlog;
-};
-
-static void buffer_append(struct XenConsole *con)
-{
- struct buffer *buffer = &con->buffer;
- XENCONS_RING_IDX cons, prod, size;
- struct xencons_interface *intf = con->sring;
-
- cons = intf->out_cons;
- prod = intf->out_prod;
- xen_mb();
-
- size = prod - cons;
- if ((size == 0) || (size > sizeof(intf->out)))
- return;
-
- if ((buffer->capacity - buffer->size) < size) {
- buffer->capacity += (size + 1024);
- buffer->data = g_realloc(buffer->data, buffer->capacity);
- }
-
- while (cons != prod)
- buffer->data[buffer->size++] = intf->out[
- MASK_XENCONS_IDX(cons++, intf->out)];
-
- xen_mb();
- intf->out_cons = cons;
- xen_be_send_notify(&con->xendev);
-
- if (buffer->max_capacity &&
- buffer->size > buffer->max_capacity) {
- /* Discard the middle of the data. */
-
- size_t over = buffer->size - buffer->max_capacity;
- uint8_t *maxpos = buffer->data + buffer->max_capacity;
-
- memmove(maxpos - over, maxpos, over);
- buffer->data = g_realloc(buffer->data, buffer->max_capacity);
- buffer->size = buffer->capacity = buffer->max_capacity;
-
- if (buffer->consumed > buffer->max_capacity - over)
- buffer->consumed = buffer->max_capacity - over;
- }
-}
-
-static void buffer_advance(struct buffer *buffer, size_t len)
-{
- buffer->consumed += len;
- if (buffer->consumed == buffer->size) {
- buffer->consumed = 0;
- buffer->size = 0;
- }
-}
-
-static int ring_free_bytes(struct XenConsole *con)
-{
- struct xencons_interface *intf = con->sring;
- XENCONS_RING_IDX cons, prod, space;
-
- cons = intf->in_cons;
- prod = intf->in_prod;
- xen_mb();
-
- space = prod - cons;
- if (space > sizeof(intf->in))
- return 0; /* ring is screwed: ignore it */
-
- return (sizeof(intf->in) - space);
-}
-
-static int xencons_can_receive(void *opaque)
-{
- struct XenConsole *con = opaque;
- return ring_free_bytes(con);
-}
-
-static void xencons_receive(void *opaque, const uint8_t *buf, int len)
-{
- struct XenConsole *con = opaque;
- struct xencons_interface *intf = con->sring;
- XENCONS_RING_IDX prod;
- int i, max;
-
- max = ring_free_bytes(con);
- /* The can_receive() func limits this, but check again anyway */
- if (max < len)
- len = max;
-
- prod = intf->in_prod;
- for (i = 0; i < len; i++) {
- intf->in[MASK_XENCONS_IDX(prod++, intf->in)] =
- buf[i];
- }
- xen_wmb();
- intf->in_prod = prod;
- xen_be_send_notify(&con->xendev);
-}
-
-static void xencons_send(struct XenConsole *con)
-{
- ssize_t len, size;
-
- size = con->buffer.size - con->buffer.consumed;
- if (con->chr)
- len = qemu_chr_fe_write(con->chr, con->buffer.data + con->buffer.consumed,
- size);
- else
- len = size;
- if (len < 1) {
- if (!con->backlog) {
- con->backlog = 1;
- xen_be_printf(&con->xendev, 1, "backlog piling up, nobody listening?\n");
- }
- } else {
- buffer_advance(&con->buffer, len);
- if (con->backlog && len == size) {
- con->backlog = 0;
- xen_be_printf(&con->xendev, 1, "backlog is gone\n");
- }
- }
-}
-
-/* -------------------------------------------------------------------- */
-
-static int con_init(struct XenDevice *xendev)
-{
- struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
- char *type, *dom, label[32];
- int ret = 0;
- const char *output;
-
- /* setup */
- dom = xs_get_domain_path(xenstore, con->xendev.dom);
- if (!xendev->dev) {
- snprintf(con->console, sizeof(con->console), "%s/console", dom);
- } else {
- snprintf(con->console, sizeof(con->console), "%s/device/console/%d", dom, xendev->dev);
- }
- free(dom);
-
- type = xenstore_read_str(con->console, "type");
- if (!type || strcmp(type, "ioemu") != 0) {
- xen_be_printf(xendev, 1, "not for me (type=%s)\n", type);
- ret = -1;
- goto out;
- }
-
- output = xenstore_read_str(con->console, "output");
-
- /* no Xen override, use qemu output device */
- if (output == NULL) {
- con->chr = serial_hds[con->xendev.dev];
- } else {
- snprintf(label, sizeof(label), "xencons%d", con->xendev.dev);
- con->chr = qemu_chr_new(label, output, NULL);
- }
-
- xenstore_store_pv_console_info(con->xendev.dev, con->chr);
-
-out:
- g_free(type);
- return ret;
-}
-
-static int con_initialise(struct XenDevice *xendev)
-{
- struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
- int limit;
-
- if (xenstore_read_int(con->console, "ring-ref", &con->ring_ref) == -1)
- return -1;
- if (xenstore_read_int(con->console, "port", &con->xendev.remote_port) == -1)
- return -1;
- if (xenstore_read_int(con->console, "limit", &limit) == 0)
- con->buffer.max_capacity = limit;
-
- if (!xendev->dev) {
- con->sring = xc_map_foreign_range(xen_xc, con->xendev.dom,
- XC_PAGE_SIZE,
- PROT_READ|PROT_WRITE,
- con->ring_ref);
- } else {
- con->sring = xc_gnttab_map_grant_ref(xendev->gnttabdev, con->xendev.dom,
- con->ring_ref,
- PROT_READ|PROT_WRITE);
- }
- if (!con->sring)
- return -1;
-
- xen_be_bind_evtchn(&con->xendev);
- if (con->chr) {
- if (qemu_chr_fe_claim(con->chr) == 0) {
- qemu_chr_add_handlers(con->chr, xencons_can_receive,
- xencons_receive, NULL, con);
- } else {
- xen_be_printf(xendev, 0,
- "xen_console_init error chardev %s already used\n",
- con->chr->label);
- con->chr = NULL;
- }
- }
-
- xen_be_printf(xendev, 1, "ring mfn %d, remote port %d, local port %d, limit %zd\n",
- con->ring_ref,
- con->xendev.remote_port,
- con->xendev.local_port,
- con->buffer.max_capacity);
- return 0;
-}
-
-static void con_disconnect(struct XenDevice *xendev)
-{
- struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
-
- if (!xendev->dev) {
- return;
- }
- if (con->chr) {
- qemu_chr_add_handlers(con->chr, NULL, NULL, NULL, NULL);
- qemu_chr_fe_release(con->chr);
- }
- xen_be_unbind_evtchn(&con->xendev);
-
- if (con->sring) {
- if (!xendev->gnttabdev) {
- munmap(con->sring, XC_PAGE_SIZE);
- } else {
- xc_gnttab_munmap(xendev->gnttabdev, con->sring, 1);
- }
- con->sring = NULL;
- }
-}
-
-static void con_event(struct XenDevice *xendev)
-{
- struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
-
- buffer_append(con);
- if (con->buffer.size - con->buffer.consumed)
- xencons_send(con);
-}
-
-/* -------------------------------------------------------------------- */
-
-struct XenDevOps xen_console_ops = {
- .size = sizeof(struct XenConsole),
- .flags = DEVOPS_FLAG_IGNORE_STATE|DEVOPS_FLAG_NEED_GNTDEV,
- .init = con_init,
- .initialise = con_initialise,
- .event = con_event,
- .disconnect = con_disconnect,
-};
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-09 06:02:15 +0000