xen: add raw console write functions for debug (0acf10d8) · Commits · 戴 / test

Add a couple of functions which can write directly to the Xen console for debugging. This output ends up on the host's dom0 console (assuming it allows the domain to write there). Signed-off-by:

Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by:

Thomas Gleixner <tglx@linutronix.de>

drivers/char/hvc_xen.c

+26 −0

Original line number	Diff line number	Diff line
		@@ -157,3 +157,29 @@ struct console xenboot_console = {
		.write = xenboot_write_console,
		.flags = CON_PRINTBUFFER \| CON_BOOT,
		};

		void xen_raw_console_write(const char *str)
		{
		int len = strlen(str);

		while(len > 0) {
		int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
		if (rc <= 0)
		break;

		str += rc;
		len -= rc;
		}
		}

		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);
		}

include/xen/hvc-console.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -3,4 +3,7 @@

		extern struct console xenboot_console;

		void xen_raw_console_write(const char *str);
		void xen_raw_printk(const char *fmt, ...);

		#endif /* XEN_HVC_CONSOLE_H */

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