diff options
Diffstat (limited to 'dtbhtool/dtbimg.c')
| -rw-r--r-- | dtbhtool/dtbimg.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/dtbhtool/dtbimg.c b/dtbhtool/dtbimg.c new file mode 100644 index 0000000..a85c901 --- /dev/null +++ b/dtbhtool/dtbimg.c @@ -0,0 +1,295 @@ +/* tools/mkbootimg/dtbimg.c +** +** Copyright 2007, The Android Open Source Project +** Copyright 2013, Sony Mobile Communications +** +** Licensed under the Apache License, Version 2.0 (the "License"); +** you may not use this file except in compliance with the License. +** You may obtain a copy of the License at +** +** http://www.apache.org/licenses/LICENSE-2.0 +** +** Unless required by applicable law or agreed to in writing, software +** distributed under the License is distributed on an "AS IS" BASIS, +** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +** See the License for the specific language governing permissions and +** limitations under the License. +** +** December 2016, Christopher N. Hesse +** Separate dt creation from mkbootimg program. +*/ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <limits.h> + +#include <sys/types.h> +#include <arpa/inet.h> +#include <assert.h> +#include <dirent.h> +#include <err.h> +#include <stdint.h> + +/* must be provided by the device tree */ +#include <samsung_dtbh.h> + +#include "libfdt.h" + +struct dt_blob; + +struct dt_entry { + uint32_t chip; + uint32_t platform; + uint32_t subtype; + uint32_t hw_rev; + uint32_t hw_rev_end; + uint32_t offset; + uint32_t size; /* including padding */ + uint32_t space; + + struct dt_blob *blob; +}; + +/* + * Comparator for sorting dt_entries + */ +static int dt_entry_cmp(const void *ap, const void *bp) +{ + struct dt_entry *a = (struct dt_entry*)ap; + struct dt_entry *b = (struct dt_entry*)bp; + + if (a->chip != b->chip) + return a->chip - b->chip; + return a->hw_rev - b->hw_rev; +} + +/* + * In memory representation of a dtb blob + */ +struct dt_blob { + uint32_t size; + uint32_t offset; + + void *payload; + struct dt_blob *next; +}; + +static void *load_file(const char *fn, unsigned *_sz) +{ + char *data; + int sz; + int fd; + + data = 0; + fd = open(fn, O_RDONLY); + if(fd < 0) return 0; + + sz = lseek(fd, 0, SEEK_END); + if(sz < 0) goto oops; + + if(lseek(fd, 0, SEEK_SET) != 0) goto oops; + + data = (char*) malloc(sz); + if(data == 0) goto oops; + + if(read(fd, data, sz) != sz) goto oops; + close(fd); + + if(_sz) *_sz = sz; + return data; + +oops: + close(fd); + if(data != 0) free(data); + return 0; +} + +void *load_dtbh_block(const char *dtb_path, unsigned pagesize, unsigned *_sz) +{ + const unsigned pagemask = pagesize - 1; + struct dt_entry *new_entries; + struct dt_entry *entries = NULL; + struct dt_entry *entry; + struct dt_blob *blob; + struct dt_blob *blob_list = NULL; + struct dt_blob *last_blob = NULL; + struct dirent *de; + unsigned new_count; + unsigned entry_count = 0; + unsigned offset; + unsigned dtb_sz; + unsigned hdr_sz = DT_HEADER_PHYS_SIZE; + uint32_t version = DTBH_VERSION; + unsigned blob_sz = 0; + char fname[PATH_MAX]; + const unsigned *prop_chip; + const unsigned *prop_platform; + const unsigned *prop_subtype; + const unsigned *prop_hw_rev; + const unsigned *prop_hw_rev_end; + int namlen; + int len; + void *dtb; + char *dtbh; + DIR *dir; + unsigned c; + + dir = opendir(dtb_path); + + if (dir == NULL) + err(1, "failed to open '%s'", dtb_path); + + while ((de = readdir(dir)) != NULL) { + namlen = strlen(de->d_name); + if (namlen < 4 || strcmp(&de->d_name[namlen - 4], ".dtb")) + continue; + + snprintf(fname, sizeof(fname), "%s/%s", dtb_path, de->d_name); + + dtb = load_file(fname, &dtb_sz); + if (dtb == NULL) + err(1, "failed to read dtb '%s'", fname); + + if (fdt_check_header(dtb) != 0) { + warnx("'%s' is not a valid dtb, skipping", fname); + free(dtb); + continue; + } + + offset = fdt_path_offset(dtb, "/"); + prop_chip = fdt_getprop(dtb, offset, "model_info-chip", &len); + if (len % (sizeof(uint32_t)) != 0) { + warnx("model_info-chip of %s is of invalid size, skipping", fname); + free(dtb); + continue; + } + + prop_platform = fdt_getprop(dtb, offset, "model_info-platform", &len); + if (strcmp((char *)&prop_platform[0], DTBH_PLATFORM)) { + warnx("model_info-platform of %s is invalid, skipping", fname); + free(dtb); + continue; + } + + prop_subtype = fdt_getprop(dtb, offset, "model_info-subtype", &len); + if (strcmp((char *)&prop_subtype[0], DTBH_SUBTYPE)) { + warnx("model_info-subtype of %s is invalid, skipping", fname); + free(dtb); + continue; + } + + prop_hw_rev = fdt_getprop(dtb, offset, "model_info-hw_rev", &len); + if (len % (sizeof(uint32_t)) != 0) { + warnx("model_info-hw_rev of %s is of invalid size, skipping", fname); + free(dtb); + continue; + } + + prop_hw_rev_end = fdt_getprop(dtb, offset, "model_info-hw_rev_end", &len); + if (len % (sizeof(uint32_t)) != 0) { + warnx("model_info-hw_rev_end of %s is of invalid size, skipping", fname); + free(dtb); + continue; + } + + blob = calloc(1, sizeof(struct dt_blob)); + if (blob == NULL) + err(1, "failed to allocate memory"); + + blob->payload = dtb; + blob->size = dtb_sz; + if (blob_list == NULL) { + blob_list = blob; + last_blob = blob; + } else { + last_blob->next = blob; + last_blob = blob; + } + + blob_sz += (blob->size + pagemask) & ~pagemask; + new_count = entry_count + 1; + new_entries = realloc(entries, new_count * sizeof(struct dt_entry)); + if (new_entries == NULL) + err(1, "failed to allocate memory"); + + entries = new_entries; + entry = &entries[entry_count]; + memset(entry, 0, sizeof(*entry)); + entry->chip = ntohl(prop_chip[0]); + entry->platform = DTBH_PLATFORM_CODE; + entry->subtype = DTBH_SUBTYPE_CODE; + entry->hw_rev = ntohl(prop_hw_rev[0]); + entry->hw_rev_end = ntohl(prop_hw_rev_end[0]); + entry->space = 0x20; /* space delimiter */ + entry->blob = blob; + + entry_count++; + + hdr_sz += entry_count * DT_ENTRY_PHYS_SIZE; + } + + closedir(dir); + + if (entry_count == 0) { + warnx("unable to locate any dtbs in the given path"); + return NULL; + } + + hdr_sz += sizeof(uint32_t); /* eot marker */ + hdr_sz = (hdr_sz + pagemask) & ~pagemask; + + qsort(entries, entry_count, sizeof(struct dt_entry), dt_entry_cmp); + + /* The size of the dt header is now known, calculate the blob offsets... */ + offset = hdr_sz; + for (blob = blob_list; blob; blob = blob->next) { + blob->offset = offset; + offset += (blob->size + pagemask) & ~pagemask; + } + + /* ...and update the entries */ + for (c = 0; c < entry_count; c++) { + entry = &entries[c]; + + entry->offset = entry->blob->offset; + entry->size = (entry->blob->size + pagemask) & ~pagemask; + } + + /* + * All parts are now gathered, so build the dt block + */ + dtbh = calloc(hdr_sz + blob_sz, 1); + if (dtbh == NULL) + err(1, "failed to allocate memory"); + + offset = 0; + + memcpy(dtbh, DTBH_MAGIC, sizeof(uint32_t)); + memcpy(dtbh + sizeof(uint32_t), &version, sizeof(uint32_t)); + memcpy(dtbh + (sizeof(uint32_t) * 2), &entry_count, sizeof(uint32_t)); + + offset += DT_HEADER_PHYS_SIZE; + + /* add dtbh entries */ + for (c = 0; c < entry_count; c++) { + entry = &entries[c]; + memcpy(dtbh + offset, entry, DT_ENTRY_PHYS_SIZE); + offset += DT_ENTRY_PHYS_SIZE; + } + + /* add padding after dt header */ + offset += pagesize - (offset & pagemask); + + for (blob = blob_list; blob; blob = blob->next) { + memcpy(dtbh + offset, blob->payload, blob->size); + offset += (blob->size + pagemask) & ~pagemask; + } + + *_sz = hdr_sz + blob_sz; + + return dtbh; +} |