diff options
Diffstat (limited to 'qemu/dtc/flattree.c')
| -rw-r--r-- | qemu/dtc/flattree.c | 933 |
1 files changed, 0 insertions, 933 deletions
diff --git a/qemu/dtc/flattree.c b/qemu/dtc/flattree.c deleted file mode 100644 index 665dad7bb..000000000 --- a/qemu/dtc/flattree.c +++ /dev/null @@ -1,933 +0,0 @@ -/* - * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. - * - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 - * USA - */ - -#include "dtc.h" -#include "srcpos.h" - -#define FTF_FULLPATH 0x1 -#define FTF_VARALIGN 0x2 -#define FTF_NAMEPROPS 0x4 -#define FTF_BOOTCPUID 0x8 -#define FTF_STRTABSIZE 0x10 -#define FTF_STRUCTSIZE 0x20 -#define FTF_NOPS 0x40 - -static struct version_info { - int version; - int last_comp_version; - int hdr_size; - int flags; -} version_table[] = { - {1, 1, FDT_V1_SIZE, - FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS}, - {2, 1, FDT_V2_SIZE, - FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID}, - {3, 1, FDT_V3_SIZE, - FTF_FULLPATH|FTF_VARALIGN|FTF_NAMEPROPS|FTF_BOOTCPUID|FTF_STRTABSIZE}, - {16, 16, FDT_V3_SIZE, - FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_NOPS}, - {17, 16, FDT_V17_SIZE, - FTF_BOOTCPUID|FTF_STRTABSIZE|FTF_STRUCTSIZE|FTF_NOPS}, -}; - -struct emitter { - void (*cell)(void *, cell_t); - void (*string)(void *, char *, int); - void (*align)(void *, int); - void (*data)(void *, struct data); - void (*beginnode)(void *, struct label *labels); - void (*endnode)(void *, struct label *labels); - void (*property)(void *, struct label *labels); -}; - -static void bin_emit_cell(void *e, cell_t val) -{ - struct data *dtbuf = e; - - *dtbuf = data_append_cell(*dtbuf, val); -} - -static void bin_emit_string(void *e, char *str, int len) -{ - struct data *dtbuf = e; - - if (len == 0) - len = strlen(str); - - *dtbuf = data_append_data(*dtbuf, str, len); - *dtbuf = data_append_byte(*dtbuf, '\0'); -} - -static void bin_emit_align(void *e, int a) -{ - struct data *dtbuf = e; - - *dtbuf = data_append_align(*dtbuf, a); -} - -static void bin_emit_data(void *e, struct data d) -{ - struct data *dtbuf = e; - - *dtbuf = data_append_data(*dtbuf, d.val, d.len); -} - -static void bin_emit_beginnode(void *e, struct label *labels) -{ - bin_emit_cell(e, FDT_BEGIN_NODE); -} - -static void bin_emit_endnode(void *e, struct label *labels) -{ - bin_emit_cell(e, FDT_END_NODE); -} - -static void bin_emit_property(void *e, struct label *labels) -{ - bin_emit_cell(e, FDT_PROP); -} - -static struct emitter bin_emitter = { - .cell = bin_emit_cell, - .string = bin_emit_string, - .align = bin_emit_align, - .data = bin_emit_data, - .beginnode = bin_emit_beginnode, - .endnode = bin_emit_endnode, - .property = bin_emit_property, -}; - -static void emit_label(FILE *f, const char *prefix, const char *label) -{ - fprintf(f, "\t.globl\t%s_%s\n", prefix, label); - fprintf(f, "%s_%s:\n", prefix, label); - fprintf(f, "_%s_%s:\n", prefix, label); -} - -static void emit_offset_label(FILE *f, const char *label, int offset) -{ - fprintf(f, "\t.globl\t%s\n", label); - fprintf(f, "%s\t= . + %d\n", label, offset); -} - -#define ASM_EMIT_BELONG(f, fmt, ...) \ - { \ - fprintf((f), "\t.byte\t((" fmt ") >> 24) & 0xff\n", __VA_ARGS__); \ - fprintf((f), "\t.byte\t((" fmt ") >> 16) & 0xff\n", __VA_ARGS__); \ - fprintf((f), "\t.byte\t((" fmt ") >> 8) & 0xff\n", __VA_ARGS__); \ - fprintf((f), "\t.byte\t(" fmt ") & 0xff\n", __VA_ARGS__); \ - } - -static void asm_emit_cell(void *e, cell_t val) -{ - FILE *f = e; - - fprintf(f, "\t.byte 0x%02x; .byte 0x%02x; .byte 0x%02x; .byte 0x%02x\n", - (val >> 24) & 0xff, (val >> 16) & 0xff, - (val >> 8) & 0xff, val & 0xff); -} - -static void asm_emit_string(void *e, char *str, int len) -{ - FILE *f = e; - char c = 0; - - if (len != 0) { - /* XXX: ewww */ - c = str[len]; - str[len] = '\0'; - } - - fprintf(f, "\t.string\t\"%s\"\n", str); - - if (len != 0) { - str[len] = c; - } -} - -static void asm_emit_align(void *e, int a) -{ - FILE *f = e; - - fprintf(f, "\t.balign\t%d, 0\n", a); -} - -static void asm_emit_data(void *e, struct data d) -{ - FILE *f = e; - int off = 0; - struct marker *m = d.markers; - - for_each_marker_of_type(m, LABEL) - emit_offset_label(f, m->ref, m->offset); - - while ((d.len - off) >= sizeof(uint32_t)) { - asm_emit_cell(e, fdt32_to_cpu(*((uint32_t *)(d.val+off)))); - off += sizeof(uint32_t); - } - - while ((d.len - off) >= 1) { - fprintf(f, "\t.byte\t0x%hhx\n", d.val[off]); - off += 1; - } - - assert(off == d.len); -} - -static void asm_emit_beginnode(void *e, struct label *labels) -{ - FILE *f = e; - struct label *l; - - for_each_label(labels, l) { - fprintf(f, "\t.globl\t%s\n", l->label); - fprintf(f, "%s:\n", l->label); - } - fprintf(f, "\t/* FDT_BEGIN_NODE */\n"); - asm_emit_cell(e, FDT_BEGIN_NODE); -} - -static void asm_emit_endnode(void *e, struct label *labels) -{ - FILE *f = e; - struct label *l; - - fprintf(f, "\t/* FDT_END_NODE */\n"); - asm_emit_cell(e, FDT_END_NODE); - for_each_label(labels, l) { - fprintf(f, "\t.globl\t%s_end\n", l->label); - fprintf(f, "%s_end:\n", l->label); - } -} - -static void asm_emit_property(void *e, struct label *labels) -{ - FILE *f = e; - struct label *l; - - for_each_label(labels, l) { - fprintf(f, "\t.globl\t%s\n", l->label); - fprintf(f, "%s:\n", l->label); - } - fprintf(f, "\t/* FDT_PROP */\n"); - asm_emit_cell(e, FDT_PROP); -} - -static struct emitter asm_emitter = { - .cell = asm_emit_cell, - .string = asm_emit_string, - .align = asm_emit_align, - .data = asm_emit_data, - .beginnode = asm_emit_beginnode, - .endnode = asm_emit_endnode, - .property = asm_emit_property, -}; - -static int stringtable_insert(struct data *d, const char *str) -{ - int i; - - /* FIXME: do this more efficiently? */ - - for (i = 0; i < d->len; i++) { - if (streq(str, d->val + i)) - return i; - } - - *d = data_append_data(*d, str, strlen(str)+1); - return i; -} - -static void flatten_tree(struct node *tree, struct emitter *emit, - void *etarget, struct data *strbuf, - struct version_info *vi) -{ - struct property *prop; - struct node *child; - int seen_name_prop = 0; - - if (tree->deleted) - return; - - emit->beginnode(etarget, tree->labels); - - if (vi->flags & FTF_FULLPATH) - emit->string(etarget, tree->fullpath, 0); - else - emit->string(etarget, tree->name, 0); - - emit->align(etarget, sizeof(cell_t)); - - for_each_property(tree, prop) { - int nameoff; - - if (streq(prop->name, "name")) - seen_name_prop = 1; - - nameoff = stringtable_insert(strbuf, prop->name); - - emit->property(etarget, prop->labels); - emit->cell(etarget, prop->val.len); - emit->cell(etarget, nameoff); - - if ((vi->flags & FTF_VARALIGN) && (prop->val.len >= 8)) - emit->align(etarget, 8); - - emit->data(etarget, prop->val); - emit->align(etarget, sizeof(cell_t)); - } - - if ((vi->flags & FTF_NAMEPROPS) && !seen_name_prop) { - emit->property(etarget, NULL); - emit->cell(etarget, tree->basenamelen+1); - emit->cell(etarget, stringtable_insert(strbuf, "name")); - - if ((vi->flags & FTF_VARALIGN) && ((tree->basenamelen+1) >= 8)) - emit->align(etarget, 8); - - emit->string(etarget, tree->name, tree->basenamelen); - emit->align(etarget, sizeof(cell_t)); - } - - for_each_child(tree, child) { - flatten_tree(child, emit, etarget, strbuf, vi); - } - - emit->endnode(etarget, tree->labels); -} - -static struct data flatten_reserve_list(struct reserve_info *reservelist, - struct version_info *vi) -{ - struct reserve_info *re; - struct data d = empty_data; - static struct fdt_reserve_entry null_re = {0,0}; - int j; - - for (re = reservelist; re; re = re->next) { - d = data_append_re(d, &re->re); - } - /* - * Add additional reserved slots if the user asked for them. - */ - for (j = 0; j < reservenum; j++) { - d = data_append_re(d, &null_re); - } - - return d; -} - -static void make_fdt_header(struct fdt_header *fdt, - struct version_info *vi, - int reservesize, int dtsize, int strsize, - int boot_cpuid_phys) -{ - int reserve_off; - - reservesize += sizeof(struct fdt_reserve_entry); - - memset(fdt, 0xff, sizeof(*fdt)); - - fdt->magic = cpu_to_fdt32(FDT_MAGIC); - fdt->version = cpu_to_fdt32(vi->version); - fdt->last_comp_version = cpu_to_fdt32(vi->last_comp_version); - - /* Reserve map should be doubleword aligned */ - reserve_off = ALIGN(vi->hdr_size, 8); - - fdt->off_mem_rsvmap = cpu_to_fdt32(reserve_off); - fdt->off_dt_struct = cpu_to_fdt32(reserve_off + reservesize); - fdt->off_dt_strings = cpu_to_fdt32(reserve_off + reservesize - + dtsize); - fdt->totalsize = cpu_to_fdt32(reserve_off + reservesize + dtsize + strsize); - - if (vi->flags & FTF_BOOTCPUID) - fdt->boot_cpuid_phys = cpu_to_fdt32(boot_cpuid_phys); - if (vi->flags & FTF_STRTABSIZE) - fdt->size_dt_strings = cpu_to_fdt32(strsize); - if (vi->flags & FTF_STRUCTSIZE) - fdt->size_dt_struct = cpu_to_fdt32(dtsize); -} - -void dt_to_blob(FILE *f, struct boot_info *bi, int version) -{ - struct version_info *vi = NULL; - int i; - struct data blob = empty_data; - struct data reservebuf = empty_data; - struct data dtbuf = empty_data; - struct data strbuf = empty_data; - struct fdt_header fdt; - int padlen = 0; - - for (i = 0; i < ARRAY_SIZE(version_table); i++) { - if (version_table[i].version == version) - vi = &version_table[i]; - } - if (!vi) - die("Unknown device tree blob version %d\n", version); - - flatten_tree(bi->dt, &bin_emitter, &dtbuf, &strbuf, vi); - bin_emit_cell(&dtbuf, FDT_END); - - reservebuf = flatten_reserve_list(bi->reservelist, vi); - - /* Make header */ - make_fdt_header(&fdt, vi, reservebuf.len, dtbuf.len, strbuf.len, - bi->boot_cpuid_phys); - - /* - * If the user asked for more space than is used, adjust the totalsize. - */ - if (minsize > 0) { - padlen = minsize - fdt32_to_cpu(fdt.totalsize); - if ((padlen < 0) && (quiet < 1)) - fprintf(stderr, - "Warning: blob size %d >= minimum size %d\n", - fdt32_to_cpu(fdt.totalsize), minsize); - } - - if (padsize > 0) - padlen = padsize; - - if (padlen > 0) { - int tsize = fdt32_to_cpu(fdt.totalsize); - tsize += padlen; - fdt.totalsize = cpu_to_fdt32(tsize); - } - - /* - * Assemble the blob: start with the header, add with alignment - * the reserve buffer, add the reserve map terminating zeroes, - * the device tree itself, and finally the strings. - */ - blob = data_append_data(blob, &fdt, vi->hdr_size); - blob = data_append_align(blob, 8); - blob = data_merge(blob, reservebuf); - blob = data_append_zeroes(blob, sizeof(struct fdt_reserve_entry)); - blob = data_merge(blob, dtbuf); - blob = data_merge(blob, strbuf); - - /* - * If the user asked for more space than is used, pad out the blob. - */ - if (padlen > 0) - blob = data_append_zeroes(blob, padlen); - - if (fwrite(blob.val, blob.len, 1, f) != 1) { - if (ferror(f)) - die("Error writing device tree blob: %s\n", - strerror(errno)); - else - die("Short write on device tree blob\n"); - } - - /* - * data_merge() frees the right-hand element so only the blob - * remains to be freed. - */ - data_free(blob); -} - -static void dump_stringtable_asm(FILE *f, struct data strbuf) -{ - const char *p; - int len; - - p = strbuf.val; - - while (p < (strbuf.val + strbuf.len)) { - len = strlen(p); - fprintf(f, "\t.string \"%s\"\n", p); - p += len+1; - } -} - -void dt_to_asm(FILE *f, struct boot_info *bi, int version) -{ - struct version_info *vi = NULL; - int i; - struct data strbuf = empty_data; - struct reserve_info *re; - const char *symprefix = "dt"; - - for (i = 0; i < ARRAY_SIZE(version_table); i++) { - if (version_table[i].version == version) - vi = &version_table[i]; - } - if (!vi) - die("Unknown device tree blob version %d\n", version); - - fprintf(f, "/* autogenerated by dtc, do not edit */\n\n"); - - emit_label(f, symprefix, "blob_start"); - emit_label(f, symprefix, "header"); - fprintf(f, "\t/* magic */\n"); - asm_emit_cell(f, FDT_MAGIC); - fprintf(f, "\t/* totalsize */\n"); - ASM_EMIT_BELONG(f, "_%s_blob_abs_end - _%s_blob_start", - symprefix, symprefix); - fprintf(f, "\t/* off_dt_struct */\n"); - ASM_EMIT_BELONG(f, "_%s_struct_start - _%s_blob_start", - symprefix, symprefix); - fprintf(f, "\t/* off_dt_strings */\n"); - ASM_EMIT_BELONG(f, "_%s_strings_start - _%s_blob_start", - symprefix, symprefix); - fprintf(f, "\t/* off_mem_rsvmap */\n"); - ASM_EMIT_BELONG(f, "_%s_reserve_map - _%s_blob_start", - symprefix, symprefix); - fprintf(f, "\t/* version */\n"); - asm_emit_cell(f, vi->version); - fprintf(f, "\t/* last_comp_version */\n"); - asm_emit_cell(f, vi->last_comp_version); - - if (vi->flags & FTF_BOOTCPUID) { - fprintf(f, "\t/* boot_cpuid_phys */\n"); - asm_emit_cell(f, bi->boot_cpuid_phys); - } - - if (vi->flags & FTF_STRTABSIZE) { - fprintf(f, "\t/* size_dt_strings */\n"); - ASM_EMIT_BELONG(f, "_%s_strings_end - _%s_strings_start", - symprefix, symprefix); - } - - if (vi->flags & FTF_STRUCTSIZE) { - fprintf(f, "\t/* size_dt_struct */\n"); - ASM_EMIT_BELONG(f, "_%s_struct_end - _%s_struct_start", - symprefix, symprefix); - } - - /* - * Reserve map entries. - * Align the reserve map to a doubleword boundary. - * Each entry is an (address, size) pair of u64 values. - * Always supply a zero-sized temination entry. - */ - asm_emit_align(f, 8); - emit_label(f, symprefix, "reserve_map"); - - fprintf(f, "/* Memory reserve map from source file */\n"); - - /* - * Use .long on high and low halfs of u64s to avoid .quad - * as it appears .quad isn't available in some assemblers. - */ - for (re = bi->reservelist; re; re = re->next) { - struct label *l; - - for_each_label(re->labels, l) { - fprintf(f, "\t.globl\t%s\n", l->label); - fprintf(f, "%s:\n", l->label); - } - ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.address >> 32)); - ASM_EMIT_BELONG(f, "0x%08x", - (unsigned int)(re->re.address & 0xffffffff)); - ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.size >> 32)); - ASM_EMIT_BELONG(f, "0x%08x", (unsigned int)(re->re.size & 0xffffffff)); - } - for (i = 0; i < reservenum; i++) { - fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n"); - } - - fprintf(f, "\t.long\t0, 0\n\t.long\t0, 0\n"); - - emit_label(f, symprefix, "struct_start"); - flatten_tree(bi->dt, &asm_emitter, f, &strbuf, vi); - - fprintf(f, "\t/* FDT_END */\n"); - asm_emit_cell(f, FDT_END); - emit_label(f, symprefix, "struct_end"); - - emit_label(f, symprefix, "strings_start"); - dump_stringtable_asm(f, strbuf); - emit_label(f, symprefix, "strings_end"); - - emit_label(f, symprefix, "blob_end"); - - /* - * If the user asked for more space than is used, pad it out. - */ - if (minsize > 0) { - fprintf(f, "\t.space\t%d - (_%s_blob_end - _%s_blob_start), 0\n", - minsize, symprefix, symprefix); - } - if (padsize > 0) { - fprintf(f, "\t.space\t%d, 0\n", padsize); - } - emit_label(f, symprefix, "blob_abs_end"); - - data_free(strbuf); -} - -struct inbuf { - char *base, *limit, *ptr; -}; - -static void inbuf_init(struct inbuf *inb, void *base, void *limit) -{ - inb->base = base; - inb->limit = limit; - inb->ptr = inb->base; -} - -static void flat_read_chunk(struct inbuf *inb, void *p, int len) -{ - if ((inb->ptr + len) > inb->limit) - die("Premature end of data parsing flat device tree\n"); - - memcpy(p, inb->ptr, len); - - inb->ptr += len; -} - -static uint32_t flat_read_word(struct inbuf *inb) -{ - uint32_t val; - - assert(((inb->ptr - inb->base) % sizeof(val)) == 0); - - flat_read_chunk(inb, &val, sizeof(val)); - - return fdt32_to_cpu(val); -} - -static void flat_realign(struct inbuf *inb, int align) -{ - int off = inb->ptr - inb->base; - - inb->ptr = inb->base + ALIGN(off, align); - if (inb->ptr > inb->limit) - die("Premature end of data parsing flat device tree\n"); -} - -static char *flat_read_string(struct inbuf *inb) -{ - int len = 0; - const char *p = inb->ptr; - char *str; - - do { - if (p >= inb->limit) - die("Premature end of data parsing flat device tree\n"); - len++; - } while ((*p++) != '\0'); - - str = xstrdup(inb->ptr); - - inb->ptr += len; - - flat_realign(inb, sizeof(uint32_t)); - - return str; -} - -static struct data flat_read_data(struct inbuf *inb, int len) -{ - struct data d = empty_data; - - if (len == 0) - return empty_data; - - d = data_grow_for(d, len); - d.len = len; - - flat_read_chunk(inb, d.val, len); - - flat_realign(inb, sizeof(uint32_t)); - - return d; -} - -static char *flat_read_stringtable(struct inbuf *inb, int offset) -{ - const char *p; - - p = inb->base + offset; - while (1) { - if (p >= inb->limit || p < inb->base) - die("String offset %d overruns string table\n", - offset); - - if (*p == '\0') - break; - - p++; - } - - return xstrdup(inb->base + offset); -} - -static struct property *flat_read_property(struct inbuf *dtbuf, - struct inbuf *strbuf, int flags) -{ - uint32_t proplen, stroff; - char *name; - struct data val; - - proplen = flat_read_word(dtbuf); - stroff = flat_read_word(dtbuf); - - name = flat_read_stringtable(strbuf, stroff); - - if ((flags & FTF_VARALIGN) && (proplen >= 8)) - flat_realign(dtbuf, 8); - - val = flat_read_data(dtbuf, proplen); - - return build_property(name, val); -} - - -static struct reserve_info *flat_read_mem_reserve(struct inbuf *inb) -{ - struct reserve_info *reservelist = NULL; - struct reserve_info *new; - struct fdt_reserve_entry re; - - /* - * Each entry is a pair of u64 (addr, size) values for 4 cell_t's. - * List terminates at an entry with size equal to zero. - * - * First pass, count entries. - */ - while (1) { - flat_read_chunk(inb, &re, sizeof(re)); - re.address = fdt64_to_cpu(re.address); - re.size = fdt64_to_cpu(re.size); - if (re.size == 0) - break; - - new = build_reserve_entry(re.address, re.size); - reservelist = add_reserve_entry(reservelist, new); - } - - return reservelist; -} - - -static char *nodename_from_path(const char *ppath, const char *cpath) -{ - int plen; - - plen = strlen(ppath); - - if (!strneq(ppath, cpath, plen)) - die("Path \"%s\" is not valid as a child of \"%s\"\n", - cpath, ppath); - - /* root node is a special case */ - if (!streq(ppath, "/")) - plen++; - - return xstrdup(cpath + plen); -} - -static struct node *unflatten_tree(struct inbuf *dtbuf, - struct inbuf *strbuf, - const char *parent_flatname, int flags) -{ - struct node *node; - char *flatname; - uint32_t val; - - node = build_node(NULL, NULL); - - flatname = flat_read_string(dtbuf); - - if (flags & FTF_FULLPATH) - node->name = nodename_from_path(parent_flatname, flatname); - else - node->name = flatname; - - do { - struct property *prop; - struct node *child; - - val = flat_read_word(dtbuf); - switch (val) { - case FDT_PROP: - if (node->children) - fprintf(stderr, "Warning: Flat tree input has " - "subnodes preceding a property.\n"); - prop = flat_read_property(dtbuf, strbuf, flags); - add_property(node, prop); - break; - - case FDT_BEGIN_NODE: - child = unflatten_tree(dtbuf,strbuf, flatname, flags); - add_child(node, child); - break; - - case FDT_END_NODE: - break; - - case FDT_END: - die("Premature FDT_END in device tree blob\n"); - break; - - case FDT_NOP: - if (!(flags & FTF_NOPS)) - fprintf(stderr, "Warning: NOP tag found in flat tree" - " version <16\n"); - - /* Ignore */ - break; - - default: - die("Invalid opcode word %08x in device tree blob\n", - val); - } - } while (val != FDT_END_NODE); - - return node; -} - - -struct boot_info *dt_from_blob(const char *fname) -{ - FILE *f; - uint32_t magic, totalsize, version, size_dt, boot_cpuid_phys; - uint32_t off_dt, off_str, off_mem_rsvmap; - int rc; - char *blob; - struct fdt_header *fdt; - char *p; - struct inbuf dtbuf, strbuf; - struct inbuf memresvbuf; - int sizeleft; - struct reserve_info *reservelist; - struct node *tree; - uint32_t val; - int flags = 0; - - f = srcfile_relative_open(fname, NULL); - - rc = fread(&magic, sizeof(magic), 1, f); - if (ferror(f)) - die("Error reading DT blob magic number: %s\n", - strerror(errno)); - if (rc < 1) { - if (feof(f)) - die("EOF reading DT blob magic number\n"); - else - die("Mysterious short read reading magic number\n"); - } - - magic = fdt32_to_cpu(magic); - if (magic != FDT_MAGIC) - die("Blob has incorrect magic number\n"); - - rc = fread(&totalsize, sizeof(totalsize), 1, f); - if (ferror(f)) - die("Error reading DT blob size: %s\n", strerror(errno)); - if (rc < 1) { - if (feof(f)) - die("EOF reading DT blob size\n"); - else - die("Mysterious short read reading blob size\n"); - } - - totalsize = fdt32_to_cpu(totalsize); - if (totalsize < FDT_V1_SIZE) - die("DT blob size (%d) is too small\n", totalsize); - - blob = xmalloc(totalsize); - - fdt = (struct fdt_header *)blob; - fdt->magic = cpu_to_fdt32(magic); - fdt->totalsize = cpu_to_fdt32(totalsize); - - sizeleft = totalsize - sizeof(magic) - sizeof(totalsize); - p = blob + sizeof(magic) + sizeof(totalsize); - - while (sizeleft) { - if (feof(f)) - die("EOF before reading %d bytes of DT blob\n", - totalsize); - - rc = fread(p, 1, sizeleft, f); - if (ferror(f)) - die("Error reading DT blob: %s\n", - strerror(errno)); - - sizeleft -= rc; - p += rc; - } - - off_dt = fdt32_to_cpu(fdt->off_dt_struct); - off_str = fdt32_to_cpu(fdt->off_dt_strings); - off_mem_rsvmap = fdt32_to_cpu(fdt->off_mem_rsvmap); - version = fdt32_to_cpu(fdt->version); - boot_cpuid_phys = fdt32_to_cpu(fdt->boot_cpuid_phys); - - if (off_mem_rsvmap >= totalsize) - die("Mem Reserve structure offset exceeds total size\n"); - - if (off_dt >= totalsize) - die("DT structure offset exceeds total size\n"); - - if (off_str > totalsize) - die("String table offset exceeds total size\n"); - - if (version >= 3) { - uint32_t size_str = fdt32_to_cpu(fdt->size_dt_strings); - if (off_str+size_str > totalsize) - die("String table extends past total size\n"); - inbuf_init(&strbuf, blob + off_str, blob + off_str + size_str); - } else { - inbuf_init(&strbuf, blob + off_str, blob + totalsize); - } - - if (version >= 17) { - size_dt = fdt32_to_cpu(fdt->size_dt_struct); - if (off_dt+size_dt > totalsize) - die("Structure block extends past total size\n"); - } - - if (version < 16) { - flags |= FTF_FULLPATH | FTF_NAMEPROPS | FTF_VARALIGN; - } else { - flags |= FTF_NOPS; - } - - inbuf_init(&memresvbuf, - blob + off_mem_rsvmap, blob + totalsize); - inbuf_init(&dtbuf, blob + off_dt, blob + totalsize); - - reservelist = flat_read_mem_reserve(&memresvbuf); - - val = flat_read_word(&dtbuf); - - if (val != FDT_BEGIN_NODE) - die("Device tree blob doesn't begin with FDT_BEGIN_NODE (begins with 0x%08x)\n", val); - - tree = unflatten_tree(&dtbuf, &strbuf, "", flags); - - val = flat_read_word(&dtbuf); - if (val != FDT_END) - die("Device tree blob doesn't end with FDT_END\n"); - - free(blob); - - fclose(f); - - return build_boot_info(reservelist, tree, boot_cpuid_phys); -} |