#include <linux/types.h>
#include <asm/xen/hypervisor.h>
+
+#include <xen/xen.h>
#include <xen/page.h>
#include <xen/events.h>
#include <xen/interface/io/console.h>
/* ------------------------------------------------------------------ */
+static unsigned long console_pfn = ~0ul;
+
static inline struct xencons_interface *xencons_interface(void)
{
- return mfn_to_virt(xen_start_info->console.domU.mfn);
+ if (console_pfn == ~0ul)
+ return mfn_to_virt(xen_start_info->console.domU.mfn);
+ else
+ return __va(console_pfn << PAGE_SHIFT);
}
static inline void notify_daemon(void)
notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
}
-static int write_console(uint32_t vtermno, const char *data, int len)
+static int __write_console(const char *data, int len)
{
struct xencons_interface *intf = xencons_interface();
XENCONS_RING_IDX cons, prod;
return sent;
}
+static int write_console(uint32_t vtermno, const char *data, int len)
+{
+ int ret = len;
+
+ /*
+ * Make sure the whole buffer is emitted, polling if
+ * necessary. We don't ever want to rely on the hvc daemon
+ * because the most interesting console output is when the
+ * kernel is crippled.
+ */
+ while (len) {
+ int sent = __write_console(data, len);
+
+ data += sent;
+ len -= sent;
+
+ if (unlikely(len))
+ HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
+ }
+
+ return ret;
+}
+
static int read_console(uint32_t vtermno, char *buf, int len)
{
struct xencons_interface *intf = xencons_interface();
static struct hv_ops hvc_ops = {
.get_chars = read_console,
.put_chars = write_console,
+ .notifier_add = notifier_add_irq,
+ .notifier_del = notifier_del_irq,
+ .notifier_hangup = notifier_hangup_irq,
};
static int __init xen_init(void)
{
struct hvc_struct *hp;
- if (!is_running_on_xen())
- return 0;
+ if (!xen_pv_domain() ||
+ xen_initial_domain() ||
+ !xen_start_info->console.domU.evtchn)
+ return -ENODEV;
xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
if (xencons_irq < 0)
- xencons_irq = 0 /* NO_IRQ */;
+ xencons_irq = 0; /* NO_IRQ */
+
hp = hvc_alloc(HVC_COOKIE, xencons_irq, &hvc_ops, 256);
if (IS_ERR(hp))
return PTR_ERR(hp);
hvc = hp;
+
+ console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
+
return 0;
}
+void xen_console_resume(void)
+{
+ if (xencons_irq)
+ rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
+}
+
static void __exit xen_fini(void)
{
if (hvc)
static int xen_cons_init(void)
{
- if (!is_running_on_xen())
+ if (!xen_pv_domain())
return 0;
hvc_instantiate(HVC_COOKIE, 0, &hvc_ops);
module_exit(xen_fini);
console_initcall(xen_cons_init);
+static void raw_console_write(const char *str, int len)
+{
+ while(len > 0) {
+ int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
+ if (rc <= 0)
+ break;
+
+ str += rc;
+ len -= rc;
+ }
+}
+
+#ifdef CONFIG_EARLY_PRINTK
static void xenboot_write_console(struct console *console, const char *string,
unsigned len)
{
unsigned int linelen, off = 0;
const char *pos;
+ raw_console_write(string, len);
+
+ write_console(0, "(early) ", 8);
while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
linelen = pos-string+off;
if (off + linelen > len)
struct console xenboot_console = {
.name = "xenboot",
.write = xenboot_write_console,
- .flags = CON_PRINTBUFFER | CON_BOOT,
+ .flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
};
+#endif /* CONFIG_EARLY_PRINTK */
+
+void xen_raw_console_write(const char *str)
+{
+ raw_console_write(str, strlen(str));
+}
+
+void xen_raw_printk(const char *fmt, ...)
+{
+ static char buf[512];
+ va_list ap;
+
+ va_start(ap, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, ap);
+ va_end(ap);
+
+ xen_raw_console_write(buf);
+}