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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v7 04/19] amd64: introduce hook for custom preload metadata parsers
---
sys/amd64/amd64/machdep.c | 45 +++++++++++++----
sys/amd64/include/sysarch.h | 12 +++++
sys/conf/files.amd64 | 1 +
sys/x86/xen/pv.c | 114 +++++++++++++++++++++++++++++++++++++++++++
sys/xen/pv.h | 28 +++++++++++
5 files changed, 189 insertions(+), 11 deletions(-)
create mode 100644 sys/x86/xen/pv.c
create mode 100644 sys/xen/pv.h
diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c
index 1880f23..09d9a1a 100644
--- a/sys/amd64/amd64/machdep.c
+++ b/sys/amd64/amd64/machdep.c
@@ -126,6 +126,7 @@ __FBSDID("$FreeBSD$");
#include <machine/reg.h>
#include <machine/sigframe.h>
#include <machine/specialreg.h>
+#include <machine/sysarch.h>
#ifdef PERFMON
#include <machine/perfmon.h>
#endif
@@ -148,6 +149,7 @@ __FBSDID("$FreeBSD$");
#ifdef XENHVM
#include <xen/xen-os.h>
+#include <xen/pv.h>
#endif
/* Sanity check for __curthread() */
@@ -172,6 +174,14 @@ static int set_fpcontext(struct thread *td, const
mcontext_t *mcp,
char *xfpustate, size_t xfpustate_len);
SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
+/* Preload data parse function */
+static caddr_t native_parse_preload_data(u_int64_t);
+
+/* Default init_ops implementation. */
+struct init_ops init_ops = {
+ .parse_preload_data = native_parse_preload_data,
+};
+
/*
* The file "conf/ldscript.amd64" defines the symbol "kernphys". Its value is
* the physical address at which the kernel is loaded.
@@ -1690,6 +1700,26 @@ do_next:
msgbufp = (struct msgbuf *)PHYS_TO_DMAP(phys_avail[pa_indx]);
}
+static caddr_t
+native_parse_preload_data(u_int64_t modulep)
+{
+ caddr_t kmdp;
+
+ preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
+ preload_bootstrap_relocate(KERNBASE);
+ kmdp = preload_search_by_type("elf kernel");
+ if (kmdp == NULL)
+ kmdp = preload_search_by_type("elf64 kernel");
+ boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
+ kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
+#ifdef DDB
+ ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
+ ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
+#endif
+
+ return (kmdp);
+}
+
#ifdef XENHVM
/*
* First function called by the Xen PVH boot sequence.
@@ -1754,6 +1784,9 @@ hammer_time_xen(start_info_t *si, u_int64_t xenstack)
}
load_cr3(((u_int64_t)&PT4[0]) - KERNBASE);
+ /* Set the hooks for early functions that diverge from bare metal */
+ xen_pv_set_init_ops();
+
/* Now we can jump into the native init function */
return (hammer_time(0, physfree));
}
@@ -1783,17 +1816,7 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
*/
proc_linkup0(&proc0, &thread0);
- preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE);
- preload_bootstrap_relocate(KERNBASE);
- kmdp = preload_search_by_type("elf kernel");
- if (kmdp == NULL)
- kmdp = preload_search_by_type("elf64 kernel");
- boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
- kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE;
-#ifdef DDB
- ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
- ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
-#endif
+ kmdp = init_ops.parse_preload_data(modulep);
/* Init basic tunables, hz etc */
init_param1();
diff --git a/sys/amd64/include/sysarch.h b/sys/amd64/include/sysarch.h
index cd380d4..58ac8cd 100644
--- a/sys/amd64/include/sysarch.h
+++ b/sys/amd64/include/sysarch.h
@@ -4,3 +4,15 @@
/* $FreeBSD$ */
#include <x86/sysarch.h>
+
+/*
+ * Struct containing pointers to init functions whose
+ * implementation is run time selectable. Selection can be made,
+ * for example, based on detection of a BIOS variant or
+ * hypervisor environment.
+ */
+struct init_ops {
+ caddr_t (*parse_preload_data)(u_int64_t);
+};
+
+extern struct init_ops init_ops;
diff --git a/sys/conf/files.amd64 b/sys/conf/files.amd64
index d1bdcd9..b3b1319 100644
--- a/sys/conf/files.amd64
+++ b/sys/conf/files.amd64
@@ -566,3 +566,4 @@ x86/x86/nexus.c standard
x86/x86/tsc.c standard
x86/xen/hvm.c optional xenhvm
x86/xen/xen_intr.c optional xen | xenhvm
+x86/xen/pv.c optional xenhvm
diff --git a/sys/x86/xen/pv.c b/sys/x86/xen/pv.c
new file mode 100644
index 0000000..bbaca32
--- /dev/null
+++ b/sys/x86/xen/pv.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2004 Christian Limpach.
+ * Copyright (c) 2004-2006,2008 Kip Macy
+ * Copyright (c) 2013 Roger Pau Monnà <roger.pau@xxxxxxxxxx>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/reboot.h>
+#include <sys/systm.h>
+
+#include <machine/sysarch.h>
+
+#include <xen/xen-os.h>
+#include <xen/pv.h>
+
+/*--------------------------- Forward Declarations
---------------------------*/
+static caddr_t xen_pv_parse_preload_data(u_int64_t);
+
+/*-------------------------------- Global Data
-------------------------------*/
+/* Xen init_ops implementation. */
+struct init_ops xen_init_ops = {
+ .parse_preload_data = xen_pv_parse_preload_data,
+};
+
+static struct
+{
+ const char *ev;
+ int mask;
+} howto_names[] = {
+ {"boot_askname", RB_ASKNAME},
+ {"boot_single", RB_SINGLE},
+ {"boot_nosync", RB_NOSYNC},
+ {"boot_halt", RB_ASKNAME},
+ {"boot_serial", RB_SERIAL},
+ {"boot_cdrom", RB_CDROM},
+ {"boot_gdb", RB_GDB},
+ {"boot_gdb_pause", RB_RESERVED1},
+ {"boot_verbose", RB_VERBOSE},
+ {"boot_multicons", RB_MULTIPLE},
+ {NULL, 0}
+};
+
+/*
+ * Functions to convert the "extra" parameters passed by Xen
+ * into FreeBSD boot options (from the i386 Xen port).
+ */
+static char *
+xen_setbootenv(char *cmd_line)
+{
+ char *cmd_line_next;
+
+ /* Skip leading spaces */
+ for (; *cmd_line == ' '; cmd_line++);
+
+ for (cmd_line_next = cmd_line; strsep(&cmd_line_next, ",") != NULL;);
+ return (cmd_line);
+}
+
+static int
+xen_boothowto(char *envp)
+{
+ int i, howto = 0;
+
+ /* get equivalents from the environment */
+ for (i = 0; howto_names[i].ev != NULL; i++)
+ if (getenv(howto_names[i].ev) != NULL)
+ howto |= howto_names[i].mask;
+ return (howto);
+}
+
+static caddr_t
+xen_pv_parse_preload_data(u_int64_t modulep)
+{
+ /* Parse the extra boot information given by Xen */
+ if (HYPERVISOR_start_info->cmd_line)
+ kern_envp = xen_setbootenv(HYPERVISOR_start_info->cmd_line);
+ boothowto |= xen_boothowto(kern_envp);
+
+ return (NULL);
+}
+
+void
+xen_pv_set_init_ops(void)
+{
+ /* Init ops for Xen PV */
+ init_ops = xen_init_ops;
+}
diff --git a/sys/xen/pv.h b/sys/xen/pv.h
new file mode 100644
index 0000000..71b8776
--- /dev/null
+++ b/sys/xen/pv.h
@@ -0,0 +1,28 @@
+/*
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef __XEN_PV_H__
+#define __XEN_PV_H__
+
+void xen_pv_set_init_ops(void);
+
+#endif /* __XEN_PV_H__ */
--
1.7.7.5 (Apple Git-26)
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