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From: Rusty Russell <rusty@rustcorp.com.au>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
virtualization <virtualization@lists.osdl.org>
Subject: [PATCH 6/8] lguest: trivial guest console driver
Date: Mon, 12 Feb 2007 14:53:25 +1100 [thread overview]
Message-ID: <1171252405.10409.39.camel@localhost.localdomain> (raw)
In-Reply-To: <1171252321.10409.36.camel@localhost.localdomain>
A trivial driver to have a basic lguest console, using the hvc_console
infrastructure.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff -r aaa62bd9788a drivers/char/Makefile
--- a/drivers/char/Makefile Mon Feb 12 13:01:16 2007 +1100
+++ b/drivers/char/Makefile Mon Feb 12 13:01:45 2007 +1100
@@ -44,6 +44,7 @@ obj-$(CONFIG_SX) += sx.o generic_serial
obj-$(CONFIG_SX) += sx.o generic_serial.o
obj-$(CONFIG_RIO) += rio/ generic_serial.o
obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o
+obj-$(CONFIG_LGUEST_GUEST) += hvc_lguest.o
obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o
obj-$(CONFIG_HVC_RTAS) += hvc_rtas.o
obj-$(CONFIG_HVC_DRIVER) += hvc_console.o
diff -r aaa62bd9788a drivers/char/hvc_lguest.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/char/hvc_lguest.c Mon Feb 12 13:01:19 2007 +1100
@@ -0,0 +1,99 @@
+/* Simple console for lguest.
+ *
+ * Copyright (C) 2006 Rusty Russell, IBM Corporation
+ *
+ * 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/err.h>
+#include <linux/init.h>
+#include <asm/lguest_device.h>
+#include "hvc_console.h"
+
+static int cons_irq;
+static int cons_offset;
+static char inbuf[256];
+static struct lguest_dma cons_input = { .used_len = 0,
+ .addr[0] = __pa(inbuf),
+ .len[0] = sizeof(inbuf),
+ .len[1] = 0 };
+
+static int get_chars(u32 vtermno, char *buf, int count)
+{
+ if (!cons_input.used_len)
+ return 0;
+
+ if (cons_input.used_len - cons_offset < count)
+ count = cons_input.used_len - cons_offset;
+
+ memcpy(buf, inbuf + cons_offset, count);
+ cons_offset += count;
+ if (cons_offset == cons_input.used_len) {
+ cons_offset = 0;
+ cons_input.used_len = 0;
+ }
+ return count;
+}
+
+static int put_chars(u32 vtermno, const char *buf, int count)
+{
+ struct lguest_dma dma;
+
+ /* FIXME: what if it's over a page boundary? */
+ dma.len[0] = count;
+ dma.len[1] = 0;
+ dma.addr[0] = __pa(buf);
+
+ hcall(LHCALL_SEND_DMA, 4, __pa(&dma), 0);
+ return count;
+}
+
+struct hv_ops lguest_cons = {
+ .get_chars = get_chars,
+ .put_chars = put_chars,
+};
+
+static int __init cons_init(void)
+{
+ if (strcmp(paravirt_ops.name, "lguest") != 0)
+ return 0;
+
+ return hvc_instantiate(0, 0, &lguest_cons);
+}
+console_initcall(cons_init);
+
+static int lguestcons_probe(struct lguest_device *lhdev)
+{
+ cons_irq = lhdev->index+1;
+ lhdev->private = hvc_alloc(0, cons_irq, &lguest_cons, 256);
+ if (IS_ERR(lhdev->private))
+ return PTR_ERR(lhdev->private);
+
+ if (!hcall(LHCALL_BIND_DMA, 0, __pa(&cons_input), (1<<8)+cons_irq))
+ printk("lguest console: failed to bind buffer.\n");
+ return 0;
+}
+
+static struct lguest_driver lguestcons_drv = {
+ .name = "lguestcons",
+ .owner = THIS_MODULE,
+ .device_type = LGUEST_DEVICE_T_CONSOLE,
+ .probe = lguestcons_probe,
+};
+
+static int __init hvc_lguest_init(void)
+{
+ return register_lguest_driver(&lguestcons_drv);
+}
+module_init(hvc_lguest_init);
next prev parent reply other threads:[~2007-02-12 3:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-12 3:32 [PATCH 1/7] cleanup: paravirt unhandled fallthrough Rusty Russell
2007-02-12 3:33 ` [PATCH 2/7] cleanup: Initialize esp0 properly all the time Rusty Russell
2007-02-12 3:34 ` [PATCH 3/7] cleanup: Make hvc_console.c compile on non-PowerPC Rusty Russell
2007-02-12 3:35 ` [PATCH 4/7] cleanup: Move mce_disabled to asm/mce.h Rusty Russell
2007-02-12 3:36 ` [PATCH 5/7] cleanup: Rename cpu_gdt_descr and remove extern declaration from smpboot.c Rusty Russell
2007-02-12 3:37 ` [PATCH 6/7] cleanup: Remove extern declaration from mm/discontig.c, put in header Rusty Russell
2007-02-12 3:39 ` [PATCH 7/7] cleanup: make disable_acpi() valid w/o CONFIG_ACPI Rusty Russell
2007-02-12 3:41 ` [PATCH 1/2] lguest preparation: EXPORT_SYMBOL_GPL 5 functions Rusty Russell
2007-02-12 3:42 ` [PATCH 2/2] lguest preparation: expose futex infrastructure: get_futex_key, get_key_refs and drop_key_refs Rusty Russell
2007-02-12 3:44 ` [PATCH 1/8] lguest: Kconfig and headers Rusty Russell
2007-02-12 3:46 ` [PATCH 2/8] lguest: the host code (lg.ko) Rusty Russell
2007-02-12 3:48 ` [PATCH 3/8] lguest: Guest code Rusty Russell
2007-02-12 3:50 ` [PATCH 4/8] lguest: Makefile Rusty Russell
2007-02-12 3:52 ` [PATCH 5/8] lguest: trivial guest network driver Rusty Russell
2007-02-12 3:53 ` Rusty Russell [this message]
2007-02-12 3:54 ` [PATCH 7/8] lguest: trivial guest block driver Rusty Russell
2007-02-12 3:55 ` [PATCH 8/8] lguest: documentatation and example launcher Rusty Russell
2007-02-12 4:43 ` [PATCH 7/8] lguest: trivial guest block driver Jens Axboe
2007-02-12 5:27 ` Rusty Russell
2007-02-12 5:32 ` Jens Axboe
2007-02-12 5:33 ` Jens Axboe
2007-02-12 7:09 ` Rusty Russell
2007-02-12 15:01 ` Jens Axboe
2007-02-13 0:25 ` Rusty Russell
2007-02-13 0:44 ` Jens Axboe
2007-02-12 15:55 ` [PATCH 5/8] lguest: trivial guest network driver Herbert Xu
2007-02-13 2:15 ` Rusty Russell
2007-02-13 14:06 ` Herbert Xu
2007-02-14 4:47 ` Rusty Russell
2007-02-14 13:57 ` Herbert Xu
2007-02-14 23:00 ` Rusty Russell
2007-02-12 16:02 ` [PATCH 1/8] lguest: Kconfig and headers James Morris
2007-02-13 5:09 ` [PATCH 7/7] cleanup: make disable_acpi() valid w/o CONFIG_ACPI Len Brown
2007-02-12 9:16 ` [PATCH 5/7] cleanup: Rename cpu_gdt_descr and remove extern declaration from smpboot.c Zachary Amsden
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