stand/kboot/kbootfdt.c

   1 /*-
   2  * Copyright (C) 2014 Nathan Whitehorn
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  18  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  20  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  21  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  23  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 __FBSDID("$FreeBSD$");
  28
  29 #include <sys/types.h>
  30 #include <fdt_platform.h>
  31 #include <libfdt.h>
  32 #include "bootstrap.h"
  33 #include "host_syscall.h"
  34 #include "kboot.h"
  35
  36 static void
  37 add_node_to_fdt(void *buffer, const char *path, int fdt_offset)
  38 {
  39         int child_offset, fd, pfd, error, dentsize;
  40         char subpath[512];
  41         void *propbuf;
  42         ssize_t proplen;
  43
  44         char dents[2048];
  45         struct host_dirent64 *dent;
  46         int d_type;
  47
  48         fd = host_open(path, O_RDONLY, 0);
  49         while (1) {
  50                 dentsize = host_getdents64(fd, dents, sizeof(dents));
  51                 if (dentsize <= 0)
  52                         break;
  53                 for (dent = (struct host_dirent64 *)dents;
  54                      (char *)dent < dents + dentsize;
  55                      dent = (struct host_dirent64 *)((void *)dent + dent->d_reclen)) {
  56                         sprintf(subpath, "%s/%s", path, dent->d_name);
  57                         if (strcmp(dent->d_name, ".") == 0 ||
  58                             strcmp(dent->d_name, "..") == 0)
  59                                 continue;
  60                         d_type = dent->d_type;
  61                         if (d_type == HOST_DT_DIR) {
  62                                 child_offset = fdt_add_subnode(buffer, fdt_offset,
  63                                     dent->d_name);
  64                                 if (child_offset < 0) {
  65                                         printf("Error %d adding node %s/%s, skipping\n",
  66                                             child_offset, path, dent->d_name);
  67                                         continue;
  68                                 }
  69                                 add_node_to_fdt(buffer, subpath, child_offset);
  70                         } else {
  71                                 propbuf = malloc(1024);
  72                                 proplen = 0;
  73                                 pfd = host_open(subpath, O_RDONLY, 0);
  74                                 if (pfd > 0) {
  75                                         proplen = host_read(pfd, propbuf, 1024);
  76                                         host_close(pfd);
  77                                 }
  78                                 error = fdt_setprop(buffer, fdt_offset, dent->d_name,
  79                                     propbuf, proplen);
  80                                 free(propbuf);
  81                                 if (error)
  82                                         printf("Error %d adding property %s to "
  83                                             "node %d\n", error, dent->d_name,
  84                                             fdt_offset);
  85                         }
  86                 }
  87         }
  88
  89         host_close(fd);
  90 }
  91
  92 int
  93 fdt_platform_load_dtb(void)
  94 {
  95         void *buffer;
  96         size_t buflen = 409600;
  97         int fd;
  98
  99         /*
 100          * Should load /sys/firmware/fdt if it exists, otherwise we walk the
 101          * tree from /proc/device-tree. The former is much easier than the
 102          * latter and also the newer interface. But as long as we support the
 103          * PS3 boot, we'll need the latter due to that kernel's age. It likely
 104          * would be better to script the decision between the two, but that
 105          * turns out to be tricky...
 106          */
 107         buffer = malloc(buflen);
 108         fd = host_open("/sys/firmware/fdt", O_RDONLY, 0);
 109         if (fd != -1) {
 110                 buflen = host_read(fd, buffer, buflen);
 111                 close(fd);
 112         } else {
 113                 fdt_create_empty_tree(buffer, buflen);
 114                 add_node_to_fdt(buffer, "/proc/device-tree",
 115                     fdt_path_offset(buffer, "/"));
 116         }
 117         fdt_arch_fixups(buffer);
 118
 119         fdt_pack(buffer);
 120
 121         fdt_load_dtb_addr(buffer);
 122         free(buffer);
 123
 124         return (0);
 125 }
 126
 127 void
 128 fdt_platform_load_overlays(void)
 129 {
 130         fdt_load_dtb_overlays(NULL);
 131 }
 132
 133 void
 134 fdt_platform_fixups(void)
 135 {
 136         fdt_apply_overlays();
 137 }