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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: [rfc/patch] use hvc for xen console
Gerd Hoffmann wrote: > Hi, > > Here is a patch (on top of the paravirt patch queue) which makes xen Oops, forgot the patch here is it ... ---
arch/i386/Kconfig.debug | 24 ++++----
arch/i386/xen/Kconfig | 1
drivers/char/hvc_console.c | 4 +
drivers/xen/console/Makefile | 3 -
drivers/xen/console/hvc_xen.c | 124 ++++++++++++++++++++++++++++++++++++++++++
5 files changed, 143 insertions(+), 13 deletions(-)
Index: paravirt-2.6.20-hg749/arch/i386/Kconfig.debug
===================================================================
--- paravirt-2.6.20-hg749.orig/arch/i386/Kconfig.debug
+++ paravirt-2.6.20-hg749/arch/i386/Kconfig.debug
@@ -6,18 +6,18 @@ config TRACE_IRQFLAGS_SUPPORT
source "lib/Kconfig.debug"
-config EARLY_PRINTK
- bool "Early printk" if EMBEDDED && DEBUG_KERNEL
- default y
- help
- Write kernel log output directly into the VGA buffer or to a serial
- port.
-
- This is useful for kernel debugging when your machine crashes very
- early before the console code is initialized. For normal operation
- it is not recommended because it looks ugly and doesn't cooperate
- with klogd/syslogd or the X server. You should normally N here,
- unless you want to debug such a crash.
+#config EARLY_PRINTK
+# bool "Early printk" if EMBEDDED && DEBUG_KERNEL
+# default y
+# help
+# Write kernel log output directly into the VGA buffer or to a serial
+# port.
+#
+# This is useful for kernel debugging when your machine crashes very
+# early before the console code is initialized. For normal operation
+# it is not recommended because it looks ugly and doesn't cooperate
+# with klogd/syslogd or the X server. You should normally N here,
+# unless you want to debug such a crash.
config DEBUG_STACKOVERFLOW
bool "Check for stack overflows"
Index: paravirt-2.6.20-hg749/arch/i386/xen/Kconfig
===================================================================
--- paravirt-2.6.20-hg749.orig/arch/i386/xen/Kconfig
+++ paravirt-2.6.20-hg749/arch/i386/xen/Kconfig
@@ -5,6 +5,7 @@
config XEN
bool "Enable support for Xen hypervisor"
depends PARAVIRT
+ select HVC_DRIVER
default y
help
This is the Linux Xen port.
Index: paravirt-2.6.20-hg749/drivers/char/hvc_console.c
===================================================================
--- paravirt-2.6.20-hg749.orig/drivers/char/hvc_console.c
+++ paravirt-2.6.20-hg749/drivers/char/hvc_console.c
@@ -49,6 +49,10 @@
#define TIMEOUT (10)
+#ifndef NO_IRQ
+#define NO_IRQ 0
+#endif
+
/*
* Wait this long per iteration while trying to push buffered data to the
* hypervisor before allowing the tty to complete a close operation.
Index: paravirt-2.6.20-hg749/drivers/xen/console/Makefile
===================================================================
--- paravirt-2.6.20-hg749.orig/drivers/xen/console/Makefile
+++ paravirt-2.6.20-hg749/drivers/xen/console/Makefile
@@ -1,2 +1,3 @@
-obj-y := console.o xencons_ring.o
+#obj-y := console.o xencons_ring.o
+obj-y := hvc_xen.o xencons_ring.o
Index: paravirt-2.6.20-hg749/drivers/xen/console/hvc_xen.c
===================================================================
--- /dev/null
+++ paravirt-2.6.20-hg749/drivers/xen/console/hvc_xen.c
@@ -0,0 +1,124 @@
+/*
+ * xen console driver interface to hvc_console.c
+ *
+ * (c) 2007 Gerd Hoffmann <kraxel@xxxxxxx>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/types.h>
+
+#include <xen/xencons.h>
+#include <asm/hypervisor.h>
+
+#include "../../char/hvc_console.h"
+
+#define HVC_COOKIE 0x58656e /* "Xen" in hex */
+#define HVC_READBUF 256
+
+static DEFINE_SPINLOCK(lock);
+static struct hvc_struct *hvc;
+static char rbuf[HVC_READBUF];
+static int rin, rout;
+
+static int write_console(uint32_t vtermno, const char *buf, int count)
+{
+ int rc;
+
+ rc = xencons_ring_send(buf, count);
+ return rc;
+}
+
+static int read_console(uint32_t vtermno, char *buf, int len)
+{
+ unsigned long flags;
+ int count;
+
+ spin_lock_irqsave(&lock, flags);
+ count = rin - rout;
+ if (count > len)
+ count = len;
+ if (count) {
+ memcpy(buf, rbuf + rout, count);
+ rout += count;
+ if (rin == rout)
+ rin = 0, rout = 0;
+ }
+ spin_unlock_irqrestore(&lock, flags);
+ return count;
+}
+
+void xencons_rx(char *buf, unsigned len)
+{
+ unsigned long flags;
+ int count;
+
+ spin_lock_irqsave(&lock, flags);
+ count = HVC_READBUF - rin;
+ if (count > len)
+ count = len;
+ memcpy(rbuf + rin, buf, count);
+ rin += count;
+ spin_unlock_irqrestore(&lock, flags);
+}
+
+void xencons_tx(void)
+{
+ /* make xencons_ring.c happy */
+}
+
+static struct hv_ops hvc_ops = {
+ .get_chars = read_console,
+ .put_chars = write_console,
+};
+
+static int __init xen_init(void)
+{
+ struct hvc_struct *hp;
+
+ if (!is_running_on_xen())
+ return 0;
+
+ xencons_ring_init();
+ hp = hvc_alloc(HVC_COOKIE, 0 /* NO_IRQ */, &hvc_ops, HVC_READBUF);
+ if (IS_ERR(hp))
+ return PTR_ERR(hp);
+
+ hvc = hp;
+ return 0;
+}
+
+static void __exit xen_fini(void)
+{
+ if (hvc)
+ hvc_remove(hvc);
+}
+
+static int xen_cons_init(void)
+{
+ if (!is_running_on_xen())
+ return 0;
+
+ hvc_instantiate(HVC_COOKIE, 0, &hvc_ops);
+ return 0;
+}
+
+module_init(xen_init);
+module_exit(xen_fini);
+console_initcall(xen_cons_init);
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