static int xenfb_on_state_change(struct xenfb_device *dev)
{
enum xenbus_state state;
state = xenfb_read_state(dev->xenfb->xsh, dev->otherend);
switch (state) {
case XenbusStateUnknown:
/* There was an error reading the frontend state. The
domain has probably gone away; in any case, there's
not much point in us continuing. */
return -1;
case XenbusStateInitialising:
case XenbusStateInitWait:
case XenbusStateInitialised:
case XenbusStateConnected:
break;
case XenbusStateClosing:
xenfb_unbind(dev);
xenfb_switch_state(dev, state);
break;
case XenbusStateClosed:
xenfb_switch_state(dev, state);
}
return 0;
}
/* Process the frontend framebuffer config */
static int xenfb_read_frontend_fb_config(struct xenfb *xenfb) {
struct xenfb_page *fb_page;
int val;
int videoram;
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "feature-update",
"%d", &val) < 0)
val = 0;
if (!val) {
fprintf(stderr, "feature-update not supported\n");
errno = ENOTSUP;
return -1;
}
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "protocol", "%63s",
xenfb->protocol) < 0)
xenfb->protocol[0] = '\0';
xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "request-update", "1");
xenfb->refresh_period = -1;
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.nodename, "videoram", "%d",
&videoram) < 0)
videoram = 0;
fb_page = xenfb->fb.page;
if (xenfb_configure_fb(xenfb, videoram * 1024 * 1024U,
fb_page->width, fb_page->height, fb_page->depth,
fb_page->mem_length, 0, fb_page->line_length)
< 0) {
errno = EINVAL;
return -1;
}
if (xenfb_map_fb(xenfb, xenfb->fb.otherend_id) < 0)
return -1;
/* Indicate we have the frame buffer resize feature */
xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "feature-resize", "1");
/* Tell kbd pointer the screen geometry */
xenfb_xs_printf(xenfb->xsh, xenfb->kbd.nodename, "width", "%d", xenfb->width);
xenfb_xs_printf(xenfb->xsh, xenfb->kbd.nodename, "height", "%d", xenfb->height);
if (xenfb_switch_state(&xenfb->fb, XenbusStateConnected))
return -1;
if (xenfb_switch_state(&xenfb->kbd, XenbusStateConnected))
return -1;
return 0;
}
/* Process the frontend framebuffer config */
static int xenfb_read_frontend_fb_config(struct xenfb *xenfb) {
struct xenfb_page *fb_page;
int val;
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "feature-update",
"%d", &val) < 0)
val = 0;
if (!val) {
fprintf(stderr, "feature-update not supported\n");
errno = ENOTSUP;
return -1;
}
if (xenfb_xs_scanf1(xenfb->xsh, xenfb->fb.otherend, "protocol", "%63s",
xenfb->protocol) < 0)
xenfb->protocol[0] = '\0';
xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "request-update", "1");
/* TODO check for permitted ranges */
fb_page = xenfb->fb.page;
xenfb->depth = fb_page->depth;
xenfb->width = fb_page->width;
xenfb->height = fb_page->height;
/* TODO check for consistency with the above */
xenfb->fb_len = fb_page->mem_length;
xenfb->row_stride = fb_page->line_length;
fprintf(stderr, "Framebuffer depth %d width %d height %d line %d\n",
fb_page->depth, fb_page->width, fb_page->height, fb_page->line_length);
if (xenfb_map_fb(xenfb, xenfb->fb.otherend_id) < 0)
return -1;
if (xenfb_switch_state(&xenfb->fb, XenbusStateConnected))
return -1;
if (xenfb_switch_state(&xenfb->kbd, XenbusStateConnected))
return -1;
return 0;
}
/* Helper to determine if a backend device is in Created state */
static int xenfb_backend_created(struct xenfb_device *dev)
{
unsigned int state;
unsigned int dummy;
char **vec;
vec = xs_read_watch(dev->xenfb->xsh, &dummy);
if (!vec)
return -1;
free(vec);
state = xenfb_read_state(dev->xenfb->xsh, dev->nodename);
if (!((1 <<state) & ((1 << XenbusStateUnknown)
| (1 << XenbusStateInitialising)
| (1 << XenbusStateClosed)
#if 1 /* TODO fudging state to permit restarting; to be removed */
| (1 << XenbusStateInitWait)
| (1 << XenbusStateConnected)
| (1 << XenbusStateClosing)
#endif
))) {
fprintf(stderr, "FB: Carry on waiting\n");
return 1;
}
xs_unwatch(dev->xenfb->xsh, dev->nodename, "");
switch (state) {
#if 1
case XenbusStateInitWait:
case XenbusStateConnected:
printf("Fudging state to %d\n", XenbusStateInitialising); /* FIXME */
#endif
case XenbusStateInitialising:
case XenbusStateClosing:
case XenbusStateClosed:
break;
default:
fprintf(stderr, "Wrong state %d\n", state);
return -1;
}
xenfb_switch_state(dev, XenbusStateInitWait);
if (xenfb_hotplug(dev) < 0)
return -1;
return 0;
}
