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[src/trunk]: src/sys Add a "show fdt" ddb command



details:   https://anonhg.NetBSD.org/src/rev/1791df1b1c05
branches:  trunk
changeset: 945439:1791df1b1c05
user:      skrll <skrll%NetBSD.org@localhost>
date:      Fri Oct 30 16:08:44 2020 +0000

description:
Add a "show fdt" ddb command

diffstat:

 sys/ddb/db_command.c  |   38 +++++++++++-
 sys/dev/fdt/fdt_ddb.c |  154 ++++++++++++++++++++++++++++++++++++++++++++++++++
 sys/dev/fdt/fdt_ddb.h |   38 ++++++++++++
 sys/dev/fdt/files.fdt |    3 +-
 4 files changed, 230 insertions(+), 3 deletions(-)

diffs (truncated from 301 to 300 lines):

diff -r 3efea3f34f7e -r 1791df1b1c05 sys/ddb/db_command.c
--- a/sys/ddb/db_command.c      Fri Oct 30 15:39:17 2020 +0000
+++ b/sys/ddb/db_command.c      Fri Oct 30 16:08:44 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: db_command.c,v 1.173 2020/10/30 07:17:29 skrll Exp $   */
+/*     $NetBSD: db_command.c,v 1.174 2020/10/30 16:08:44 skrll Exp $   */
 
 /*
  * Copyright (c) 1996, 1997, 1998, 1999, 2002, 2009, 2019
@@ -61,11 +61,12 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: db_command.c,v 1.173 2020/10/30 07:17:29 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: db_command.c,v 1.174 2020/10/30 16:08:44 skrll Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_aio.h"
 #include "opt_ddb.h"
+#include "opt_fdt.h"
 #include "opt_kgdb.h"
 #include "opt_mqueue.h"
 #include "opt_inet.h"
@@ -102,6 +103,11 @@
 
 #include <net/route.h>
 
+#ifdef FDT
+#include <dev/fdt/fdtvar.h>
+#include <dev/fdt/fdt_ddb.h>
+#endif
+
 /*
  * Results of command search.
  */
@@ -219,6 +225,9 @@
 static void    db_vnode_lock_print_cmd(db_expr_t, bool, db_expr_t,
                    const char *);
 static void    db_vmem_print_cmd(db_expr_t, bool, db_expr_t, const char *);
+#ifdef FDT
+static void    db_fdt_print_cmd(db_expr_t, bool, db_expr_t, const char *);
+#endif
 
 static const struct db_command db_show_cmds[] = {
        { DDB_ADD_CMD("all",    NULL,
@@ -239,6 +248,10 @@
        { DDB_ADD_CMD("devices", db_show_all_devices,   0,NULL,NULL,NULL) },
        { DDB_ADD_CMD("event",  db_event_print_cmd,     0,
            "Print all the non-zero evcnt(9) event counters.", "[/fitm]",NULL) },
+#ifdef FDT
+       { DDB_ADD_CMD("fdt", db_fdt_print_cmd, 0,
+           "Show FDT information", NULL, NULL) },
+#endif
        { DDB_ADD_CMD("files", db_show_files_cmd,       0,
            "Print the files open by process at address",
            "[/f] address", NULL) },
@@ -1346,6 +1359,27 @@
 #endif
 }
 
+#ifdef FDT
+/*ARGSUSED*/
+static void
+db_fdt_print_cmd(db_expr_t addr, bool have_addr,
+    db_expr_t count, const char *modif)
+{
+#ifdef _KERNEL /* XXX CRASH(8) */
+       bool full = false;
+
+       if (modif[0] == 'f')
+               full = true;
+
+       fdt_print(have_addr ? (void *)(uintptr_t)addr : fdtbus_get_data(),
+           full, db_printf);
+#else
+       also;
+       db_kernelonly();
+#endif
+}
+#endif
+
 /*
  * Call random function:
  * !expr(arg,arg,arg)
diff -r 3efea3f34f7e -r 1791df1b1c05 sys/dev/fdt/fdt_ddb.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/fdt_ddb.c     Fri Oct 30 16:08:44 2020 +0000
@@ -0,0 +1,154 @@
+/*     $NetBSD: fdt_ddb.c,v 1.1 2020/10/30 16:08:45 skrll Exp $        */
+
+/*-
+ * Copyright (c) 2020 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Nick Hudson
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
+__KERNEL_RCSID(0, "$NetBSD: fdt_ddb.c,v 1.1 2020/10/30 16:08:45 skrll Exp $");
+
+#include <sys/param.h>
+
+#include <libfdt.h>
+#include <dev/fdt/fdt_ddb.h>
+#include <dev/fdt/fdtvar.h>
+
+#define FDT_MAX_DEPTH  16
+
+static bool
+fdt_isprint(const void *data, int len)
+{
+       const uint8_t *c = (const uint8_t *)data;
+
+       if (len == 0)
+               return false;
+
+       for (size_t j = 0; j < len; j++) {
+               if (!(isprint(c[j]) || c[j] == '\0'))
+                       return false;
+       }
+       return true;
+}
+
+static void
+fdt_print_properties(const void *fdt, int node,
+    void (*pr)(const char *, ...) __printflike(1, 2))
+{
+       int property;
+
+       fdt_for_each_property_offset(property, fdt, node) {
+               int len;
+               const struct fdt_property *prop =
+                   fdt_get_property_by_offset(fdt, property, &len);
+               const char *name = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
+
+               pr("    %s", name);
+               if (len == 0) {
+                       pr("\n");
+                       continue;
+               }
+               if (fdt_isprint(prop->data, len)) {
+                       const uint8_t *c = (const uint8_t *)prop->data;
+
+                       pr(" = \"");
+                       for (size_t j = 0; j < len; j++) {
+                               if (c[j] == '\0') {
+                                       if (j + 1 != len)
+                                               pr("\", \"");
+                               } else
+                                       pr("%c", c[j]);
+                       }
+                       pr("\"\n");
+                       continue;
+               }
+               if ((len % 4) == 0) {
+                       const uint32_t *cell = (const uint32_t *)prop->data;
+                       size_t count = len / sizeof(uint32_t);
+
+                       pr(" = <");
+                       for (size_t j = 0; j < count; j++) {
+                               pr("%#" PRIx32 "%s", fdt32_to_cpu(cell[j]),
+                                   (j != count - 1) ? " " : "");
+                       }
+                       pr(">\n");
+               } else {
+                       const uint8_t *byte = (const uint8_t *)prop->data;
+
+                       pr(" = [");
+                       for (size_t j = 0; j < len; j++) {
+                               pr("%02x%s", byte[j],
+                                  (j != len - 1) ? " " : "");
+                       }
+                       pr("]\n");
+               }
+       }
+}
+
+
+void
+fdt_print(const void *addr, bool full,
+    void (*pr)(const char *, ...) __printflike(1, 2))
+{
+       const void *fdt = addr;
+       const char *pname[FDT_MAX_DEPTH] = { NULL };
+
+       int error = fdt_check_header(fdt);
+       if (error) {
+               pr("Invalid FDT at %p\n", fdt);
+               return;
+       }
+
+       int depth = 0;
+       for (int node = fdt_path_offset(fdt, "/");
+            node >= 0 && depth >= 0;
+            node = fdt_next_node(fdt, node, &depth)) {
+               const char *name = fdt_get_name(fdt, node, NULL);
+
+               if (depth > FDT_MAX_DEPTH) {
+                       pr("max depth exceeded: %d\n", depth);
+                       continue;
+               }
+               pname[depth] = name;
+               /*
+                * change conditional for when alternative root nodes
+                * can be specified
+                */
+               if (depth == 0)
+                       pr("/");
+               for (size_t i = 1; i <= depth; i++) {
+                       if (pname[i] == NULL)
+                               break;
+                       pr("/%s", pname[i]);
+               }
+               pr("\n");
+               if (!full)
+                       continue;
+               fdt_print_properties(fdt, node, pr);
+       }
+}
diff -r 3efea3f34f7e -r 1791df1b1c05 sys/dev/fdt/fdt_ddb.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/dev/fdt/fdt_ddb.h     Fri Oct 30 16:08:44 2020 +0000
@@ -0,0 +1,38 @@
+/*     $NetBSD: fdt_ddb.h,v 1.1 2020/10/30 16:08:45 skrll Exp $        */
+
+/*-
+ * Copyright (c) 2020 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Nick Hudson
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+
+#ifndef _FDT_DDB_H
+#define _FDT_DDB_H
+
+void   fdt_print(const void *, bool, void (*)(const char *, ...) __printflike(1, 2));
+
+#endif
diff -r 3efea3f34f7e -r 1791df1b1c05 sys/dev/fdt/files.fdt
--- a/sys/dev/fdt/files.fdt     Fri Oct 30 15:39:17 2020 +0000
+++ b/sys/dev/fdt/files.fdt     Fri Oct 30 16:08:44 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.55 2020/10/27 08:57:11 ryo Exp $
+# $NetBSD: files.fdt,v 1.56 2020/10/30 16:08:45 skrll Exp $
 
 include        "external/bsd/libfdt/conf/files.libfdt"
 
@@ -58,6 +58,7 @@
 file   dev/fdt/fdt_clock.c                     fdt
 file   dev/fdt/fdt_dai.c                       fdt
 file   dev/fdt/fdt_dma.c                       fdt
+file   dev/fdt/fdt_ddb.c                       fdt & ddb
 file   dev/fdt/fdt_gpio.c                      fdt
 file   dev/fdt/fdt_i2c.c                       fdt



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