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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH v2] plat/xen: Add console support for x86_64
Console support is ported from Mini-OS. It currently
works for x86_64 only.
Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
plat/xen/Config.uk | 9 +++
plat/xen/console.c | 162 ++++++++++++++++++++++++++++++++++++--
plat/xen/include/common/console.h | 48 +++++++++++
plat/xen/x86/setup.c | 10 ++-
4 files changed, 221 insertions(+), 8 deletions(-)
create mode 100644 plat/xen/include/common/console.h
diff --git a/plat/xen/Config.uk b/plat/xen/Config.uk
index 93fa923..f5ccd46 100644
--- a/plat/xen/Config.uk
+++ b/plat/xen/Config.uk
@@ -5,8 +5,17 @@ menuconfig PLAT_XEN
select LIBUKDEBUG
select LIBNOLIBC if !HAVE_LIBC
select LIBFDT if ARCH_ARM_32
+ select XEN_DBGEMERGENCY if ARCH_ARM_32
help
Create a Unikraft image that runs as a Xen guest
if (PLAT_XEN)
+ config XEN_DBGEMERGENCY
+ bool "Emergency console for debug output"
+ default n
+ help
+ Send debug messages to the emergency console
+ instead of the hypervisor console. When this
+ option is enabled the hypervisor console is used
+ for kernel messages only.
endif
diff --git a/plat/xen/console.c b/plat/xen/console.c
index 67f8513..f2f0e78 100644
--- a/plat/xen/console.c
+++ b/plat/xen/console.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
+/* SPDX-License-Identifier: BSD-3-Clause and MIT */
/*
* Authors: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
*
@@ -32,38 +32,188 @@
* THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
*/
+/*
+ * Some of this code was ported from Mini-OS:
+ * console/xencons_ring.c and console/console.c
+ */
+/*
+ ****************************************************************************
+ * (C) 2006 - Grzegorz Milos - Cambridge University
+ ****************************************************************************
+ *
+ * File: console.h
+ * Author: Grzegorz Milos
+ * Changes:
+ *
+ * Date: Mar 2006
+ *
+ * Environment: Xen Minimal OS
+ * Description: Console interface.
+ *
+ * Handles console I/O. Defines printk.
+ *
+ ****************************************************************************
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
#include <inttypes.h>
#include <string.h>
#include <uk/plat/console.h>
#include <uk/arch/lcpu.h>
+#include <uk/assert.h>
#include <uk/essentials.h>
+#include <common/console.h>
+#include <common/events.h>
+#include <common/hypervisor.h>
#include <xen/xen.h>
+#if (defined __X86_32__) || (defined __X86_64__)
+#include <xen-x86/setup.h>
+#include <xen-x86/mm.h>
#if defined __X86_32__
#include <xen-x86/hypercall32.h>
#elif defined __X86_64__
#include <xen-x86/hypercall64.h>
+#endif
#elif (defined __ARM_32__) || (defined __ARM_64__)
+#include <xen-arm/mm.h>
#include <xen-arm/hypercall.h>
#endif
+#include <xen/io/console.h>
+#include <xen/io/protocols.h>
+#include <xen/io/ring.h>
+#ifndef CONFIG_PARAVIRT
+#include <xen/hvm/params.h>
+#endif
-int ukplat_coutd(const char *str, unsigned int len)
+static struct xencons_interface *console_ring;
+static uint32_t console_evtchn;
+static int console_ready;
+
+#ifdef CONFIG_PARAVIRT
+void _libxenplat_prepare_console(void)
{
- int rc;
+ console_ring = mfn_to_virt(HYPERVISOR_start_info->console.domU.mfn);
+ console_evtchn = HYPERVISOR_start_info->console.domU.evtchn;
+}
+#else
+void _libxenplat_prepare_console(void)
+{
+ /* NOT IMPLEMENTED YET */
+}
+#endif
- if (unlikely(len == 0))
- len = strnlen(str, len);
+#if XEN_DBGEMERGENCY
+static int emergency_output(const char *str, unsigned int len)
+{
+ int rc;
rc = HYPERVISOR_console_io(CONSOLEIO_write, len, DECONST(char *, str));
if (unlikely(rc < 0))
return rc;
return len;
}
+#endif
+
+static int hvconsole_output(const char *str, unsigned int len)
+{
+ unsigned int sent = 0;
+ XENCONS_RING_IDX cons, prod;
+
+ if (unlikely(!console_ring))
+ return sent;
+
+ cons = console_ring->out_cons;
+ prod = console_ring->out_prod;
+
+ mb(); /* make sure we have cons & prod before touching the ring */
+ UK_BUGON((prod - cons) > sizeof(console_ring->out));
+
+ while ((sent < len) && ((prod - cons) < sizeof(console_ring->out))) {
+ if (str[sent] == '\n') {
+ /* Convert: '\n' -> '\r''\n' */
+ console_ring->out[MASK_XENCONS_IDX(prod++,
+ console_ring->out)] =
+ '\r';
+ if ((prod - cons) >= sizeof(console_ring->out))
+ break; /* no more space left */
+ }
+
+ console_ring->out[MASK_XENCONS_IDX(prod++, console_ring->out)] =
+ str[sent];
+ sent++;
+ }
+ wmb(); /* ensure characters are written before increasing out_prod */
+ console_ring->out_prod = prod;
+
+ if (likely(console_ready && console_evtchn))
+ notify_remote_via_evtchn(console_evtchn);
+ return sent;
+}
+
+static void hvconsole_input(evtchn_port_t port __unused,
+ struct __regs *regs __unused,
+ void *data __unused)
+{
+ /* NOT IMPLEMENTED YET */
+}
+
+
+void _libxenplat_init_console(void)
+{
+ int err;
+
+ UK_ASSERT(console_ring != NULL);
+
+ uk_printd(DLVL_EXTRA, "hvconsole @ %p (evtchn: %"PRIu32")\n",
+ console_ring, console_evtchn);
+
+ err = bind_evtchn(console_evtchn, hvconsole_input, NULL);
+ if (err <= 0)
+ UK_CRASH("Failed to bind event channel for hvconsole: %i\n",
+ err);
+ unmask_evtchn(console_evtchn);
+
+ console_ready = 1; /* enable notification of backend */
+ /* flush queued output */
+ notify_remote_via_evtchn(console_evtchn);
+}
+
+int ukplat_coutd(const char *str, unsigned int len)
+{
+ if (unlikely(len == 0))
+ len = strnlen(str, len);
+
+#if XEN_DBGEMERGENCY
+ return emergency_output(str, len);
+#else
+ return hvconsole_output(str, len);
+#endif
+}
int ukplat_coutk(const char *str __unused, unsigned int len __unused)
{
- return 0;
+ if (unlikely(len == 0))
+ len = strnlen(str, len);
+
+ return hvconsole_output(str, len);
}
int ukplat_cink(char *str __unused, unsigned int maxlen __unused)
diff --git a/plat/xen/include/common/console.h
b/plat/xen/include/common/console.h
new file mode 100644
index 0000000..c51c69b
--- /dev/null
+++ b/plat/xen/include/common/console.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
+ *
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __CONSOLE_H__
+#define __CONSOLE_H__
+
+/* keeps buffering console message
+ * (on PV: start_info need to be loaded)
+ */
+void _libxenplat_prepare_console(void);
+
+/* initializes the console, sends out buffered messages
+ * (event system has to be initialized)
+ */
+void _libxenplat_init_console(void);
+
+#endif /* __CONSOLE_H__ */
diff --git a/plat/xen/x86/setup.c b/plat/xen/x86/setup.c
index 81cd584..cf8bad2 100644
--- a/plat/xen/x86/setup.c
+++ b/plat/xen/x86/setup.c
@@ -76,6 +76,7 @@
#include <uk/plat/bootstrap.h>
#include <xen/xen.h>
+#include <common/console.h>
#include <common/events.h>
#if LIBUKSCHED
#include <common/sched.h>
@@ -171,12 +172,15 @@ void _libxenplat_x86entry(void *start_info) __noreturn;
void _libxenplat_x86entry(void *start_info)
{
- uk_printd(DLVL_INFO, "Entering from Xen (x86, PV)...\n");
-
_init_traps();
_init_cpufeatures();
HYPERVISOR_start_info = (start_info_t *)start_info;
+ _libxenplat_prepare_console(); /* enables buffering for console */
+
+ uk_printd(DLVL_INFO, "Entering from Xen (x86, PV)...\n");
+
_init_shared_info(); /* remaps shared info */
+
strncpy(cmdline, (char *)HYPERVISOR_start_info->cmd_line,
MAX_CMDLINE_SIZE);
@@ -192,5 +196,7 @@ void _libxenplat_x86entry(void *start_info)
_init_mem();
+ _libxenplat_init_console();
+
ukplat_entry_argp(UK_NAME, cmdline, MAX_CMDLINE_SIZE);
}
--
2.7.4
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