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// SPDX-License-Identifier: GPL-2.0-or-later /* * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. */ #include "dtc.h" #include "srcpos.h" /* * Tree building functions */ void add_label(struct label **labels, char *label) { struct label *new; /* Make sure the label isn't already there */ for_each_label_withdel(*labels, new) if (streq(new->label, label)) { new->deleted = 0; return; } new = xmalloc(sizeof(*new)); memset(new, 0, sizeof(*new)); new->label = label; new->next = *labels; *labels = new; } void delete_labels(struct label **labels) { struct label *label; for_each_label(*labels, label) label->deleted = 1; } struct property *build_property(const char *name, struct data val, struct srcpos *srcpos) { struct property *new = xmalloc(sizeof(*new)); memset(new, 0, sizeof(*new)); new->name = xstrdup(name); new->val = val; new->srcpos = srcpos_copy(srcpos); return new; } struct property *build_property_delete(const char *name) { struct property *new = xmalloc(sizeof(*new)); memset(new, 0, sizeof(*new)); new->name = xstrdup(name); new->deleted = 1; return new; } struct property *chain_property(struct property *first, struct property *list) { assert(first->next == NULL); first->next = list; return first; } struct property *reverse_properties(struct property *first) { struct property *p = first; struct property *head = NULL; struct property *next; while (p) { next = p->next; p->next = head; head = p; p = next; } return head; } struct node *build_node(struct property *proplist, struct node *children, struct srcpos *srcpos) { struct node *new = xmalloc(sizeof(*new)); struct node *child; memset(new, 0, sizeof(*new)); new->proplist = reverse_properties(proplist); new->children = children; new->srcpos = srcpos_copy(srcpos); for_each_child(new, child) { child->parent = new; } return new; } struct node *build_node_delete(struct srcpos *srcpos) { struct node *new = xmalloc(sizeof(*new)); memset(new, 0, sizeof(*new)); new->deleted = 1; new->srcpos = srcpos_copy(srcpos); return new; } struct node *name_node(struct node *node, const char *name) { assert(node->name == NULL); node->name = xstrdup(name); return node; } struct node *omit_node_if_unused(struct node *node) { node->omit_if_unused = 1; return node; } struct node *reference_node(struct node *node) { node->is_referenced = 1; return node; } struct node *merge_nodes(struct node *old_node, struct node *new_node) { struct property *new_prop, *old_prop; struct node *new_child, *old_child; struct label *l; old_node->deleted = 0; /* Add new node labels to old node */ for_each_label_withdel(new_node->labels, l) add_label(&old_node->labels, l->label); /* Move properties from the new node to the old node. If there * is a collision, replace the old value with the new */ while (new_node->proplist) { /* Pop the property off the list */ new_prop = new_node->proplist; new_node->proplist = new_prop->next; new_prop->next = NULL; if (new_prop->deleted) { delete_property_by_name(old_node, new_prop->name); free(new_prop); continue; } /* Look for a collision, set new value if there is */ for_each_property_withdel(old_node, old_prop) { if (streq(old_prop->name, new_prop->name)) { /* Add new labels to old property */ for_each_label_withdel(new_prop->labels, l) add_label(&old_prop->labels, l->label); old_prop->val = new_prop->val; old_prop->deleted = 0; free(old_prop->srcpos); old_prop->srcpos = new_prop->srcpos; free(new_prop); new_prop = NULL; break; } } /* if no collision occurred, add property to the old node. */ if (new_prop) add_property(old_node, new_prop); } /* Move the override child nodes into the primary node. If * there is a collision, then merge the nodes. */ while (new_node->children) { /* Pop the child node off the list */ new_child = new_node->children; new_node->children = new_child->next_sibling; new_child->parent = NULL; new_child->next_sibling = NULL; if (new_child->deleted) { delete_node_by_name(old_node, new_child->name); free(new_child); continue; } /* Search for a collision. Merge if there is */ for_each_child_withdel(old_node, old_child) { if (streq(old_child->name, new_child->name)) { merge_nodes(old_child, new_child); new_child = NULL; break; } } /* if no collision occurred, add child to the old node. */ if (new_child) add_child(old_node, new_child); } old_node->srcpos = srcpos_extend(old_node->srcpos, new_node->srcpos); /* The new node contents are now merged into the old node. Free * the new node. */ free(new_node); return old_node; } struct node * add_orphan_node(struct node *dt, struct node *new_node, char *ref) { static unsigned int next_orphan_fragment = 0; struct node *node; struct property *p; struct data d = empty_data; char *name; if (ref[0] == '/') { d = data_add_marker(d, TYPE_STRING, ref); d = data_append_data(d, ref, strlen(ref) + 1); p = build_property("target-path", d, NULL); } else { d = data_add_marker(d, REF_PHANDLE, ref); d = data_append_integer(d, 0xffffffff, 32); p = build_property("target", d, NULL); } xasprintf(&name, "fragment@%u", next_orphan_fragment++); name_node(new_node, "__overlay__"); node = build_node(p, new_node, NULL); name_node(node, name); free(name); add_child(dt, node); return dt; } struct node *chain_node(struct node *first, struct node *list) { assert(first->next_sibling == NULL); first->next_sibling = list; return first; } void add_property(struct node *node, struct property *prop) { struct property **p; prop->next = NULL; p = &node->proplist; while (*p) p = &((*p)->next); *p = prop; } void delete_property_by_name(struct node *node, char *name) { struct property *prop = node->proplist; while (prop) { if (streq(prop->name, name)) { delete_property(prop); return; } prop = prop->next; } } void delete_property(struct property *prop) { prop->deleted = 1; delete_labels(&prop->labels); } void add_child(struct node *parent, struct node *child) { struct node **p; child->next_sibling = NULL; child->parent = parent; p = &parent->children; while (*p) p = &((*p)->next_sibling); *p = child; } void delete_node_by_name(struct node *parent, char *name) { struct node *node = parent->children; while (node) { if (streq(node->name, name)) { delete_node(node); return; } node = node->next_sibling; } } void delete_node(struct node *node) { struct property *prop; struct node *child; node->deleted = 1; for_each_child(node, child) delete_node(child); for_each_property(node, prop) delete_property(prop); delete_labels(&node->labels); } void append_to_property(struct node *node, char *name, const void *data, int len, enum markertype type) { struct data d; struct property *p; p = get_property(node, name); if (p) { d = data_add_marker(p->val, type, name); d = data_append_data(d, data, len); p->val = d; } else { d = data_add_marker(empty_data, type, name); d = data_append_data(d, data, len); p = build_property(name, d, NULL); add_property(node, p); } } struct reserve_info *build_reserve_entry(uint64_t address, uint64_t size) { struct reserve_info *new = xmalloc(sizeof(*new)); memset(new, 0, sizeof(*new)); new->address = address; new->size = size; return new; } struct reserve_info *chain_reserve_entry(struct reserve_info *first, struct reserve_info *list) { assert(first->next == NULL); first->next = list; return first; } struct reserve_info *add_reserve_entry(struct reserve_info *list, struct reserve_info *new) { struct reserve_info *last; new->next = NULL; if (! list) return new; for (last = list; last->next; last = last->next) ; last->next = new; return list; } struct dt_info *build_dt_info(unsigned int dtsflags, struct reserve_info *reservelist, struct node *tree, uint32_t boot_cpuid_phys) { struct dt_info *dti; dti = xmalloc(sizeof(*dti)); dti->dtsflags = dtsflags; dti->reservelist = reservelist; dti->dt = tree; dti->boot_cpuid_phys = boot_cpuid_phys; return dti; } /* * Tree accessor functions */ const char *get_unitname(struct node *node) { if (node->name[node->basenamelen] == '\0') return ""; else return node->name + node->basenamelen + 1; } struct property *get_property(struct node *node, const char *propname) { struct property *prop; for_each_property(node, prop) if (streq(prop->name, propname)) return prop; return NULL; } cell_t propval_cell(struct property *prop) { assert(prop->val.len == sizeof(cell_t)); return fdt32_to_cpu(*((fdt32_t *)prop->val.val)); } cell_t propval_cell_n(struct property *prop, unsigned int n) { assert(prop->val.len / sizeof(cell_t) > n); return fdt32_to_cpu(*((fdt32_t *)prop->val.val + n)); } struct property *get_property_by_label(struct node *tree, const char *label, struct node **node) { struct property *prop; struct node *c; *node = tree; for_each_property(tree, prop) { struct label *l; for_each_label(prop->labels, l) if (streq(l->label, label)) return prop; } for_each_child(tree, c) { prop = get_property_by_label(c, label, node); if (prop) return prop; } *node = NULL; return NULL; } struct marker *get_marker_label(struct node *tree, const char *label, struct node **node, struct property **prop) { struct marker *m; struct property *p; struct node *c; *node = tree; for_each_property(tree, p) { *prop = p; m = p->val.markers; for_each_marker_of_type(m, LABEL) if (streq(m->ref, label)) return m; } for_each_child(tree, c) { m = get_marker_label(c, label, node, prop); if (m) return m; } *prop = NULL; *node = NULL; return NULL; } struct node *get_subnode(struct node *node, const char *nodename) { struct node *child; for_each_child(node, child) if (streq(child->name, nodename)) return child; return NULL; } struct node *get_node_by_path(struct node *tree, const char *path) { const char *p; struct node *child; if (!path || ! (*path)) { if (tree->deleted) return NULL; return tree; } while (path[0] == '/') path++; p = strchr(path, '/'); for_each_child(tree, child) { if (p && strprefixeq(path, (size_t)(p - path), child->name)) return get_node_by_path(child, p+1); else if (!p && streq(path, child->name)) return child; } return NULL; } struct node *get_node_by_label(struct node *tree, const char *label) { struct node *child, *node; struct label *l; assert(label && (strlen(label) > 0)); for_each_label(tree->labels, l) if (streq(l->label, label)) return tree; for_each_child(tree, child) { node = get_node_by_label(child, label); if (node) return node; } return NULL; } struct node *get_node_by_phandle(struct node *tree, cell_t phandle) { struct node *child, *node; if (!phandle_is_valid(phandle)) { assert(generate_fixups); return NULL; } if (tree->phandle == phandle) { if (tree->deleted) return NULL; return tree; } for_each_child(tree, child) { node = get_node_by_phandle(child, phandle); if (node) return node; } return NULL; } struct node *get_node_by_ref(struct node *tree, const char *ref) { struct node *target = tree; const char *label = NULL, *path = NULL; if (streq(ref, "/")) return tree; if (ref[0] == '/') path = ref; else label = ref; if (label) { const char *slash = strchr(label, '/'); char *buf = NULL; if (slash) { buf = xstrndup(label, slash - label); label = buf; path = slash + 1; } target = get_node_by_label(tree, label); free(buf); if (!target) return NULL; } if (path) target = get_node_by_path(target, path); return target; } static void add_phandle_property(struct node *node, const char *name, int format) { struct data d; if (!(phandle_format & format)) return; if (get_property(node, name)) return; d = data_add_marker(empty_data, TYPE_UINT32, NULL); d = data_append_cell(d, node->phandle); add_property(node, build_property(name, d, NULL)); } cell_t get_node_phandle(struct node *root, struct node *node) { static cell_t phandle = 1; /* FIXME: ick, static local */ if (phandle_is_valid(node->phandle)) return node->phandle; while (get_node_by_phandle(root, phandle)) phandle++; node->phandle = phandle; add_phandle_property(node, "linux,phandle", PHANDLE_LEGACY); add_phandle_property(node, "phandle", PHANDLE_EPAPR); /* If the node *does* have a phandle property, we must * be dealing with a self-referencing phandle, which will be * fixed up momentarily in the caller */ return node->phandle; } uint32_t guess_boot_cpuid(struct node *tree) { struct node *cpus, *bootcpu; struct property *reg; cpus = get_node_by_path(tree, "/cpus"); if (!cpus) return 0; bootcpu = cpus->children; if (!bootcpu) return 0; reg = get_property(bootcpu, "reg"); if (!reg || (reg->val.len != sizeof(uint32_t))) return 0; /* FIXME: Sanity check node? */ return propval_cell(reg); } static int cmp_reserve_info(const void *ax, const void *bx) { const struct reserve_info *a, *b; a = *((const struct reserve_info * const *)ax); b = *((const struct reserve_info * const *)bx); if (a->address < b->address) return -1; else if (a->address > b->address) return 1; else if (a->size < b->size) return -1; else if (a->size > b->size) return 1; else return 0; } static void sort_reserve_entries(struct dt_info *dti) { struct reserve_info *ri, **tbl; int n = 0, i = 0; for (ri = dti->reservelist; ri; ri = ri->next) n++; if (n == 0) return; tbl = xmalloc(n * sizeof(*tbl)); for (ri = dti->reservelist; ri; ri = ri->next) tbl[i++] = ri; qsort(tbl, n, sizeof(*tbl), cmp_reserve_info); dti->reservelist = tbl[0]; for (i = 0; i < (n-1); i++) tbl[i]->next = tbl[i+1]; tbl[n-1]->next = NULL; free(tbl); } static int cmp_prop(const void *ax, const void *bx) { const struct property *a, *b; a = *((const struct property * const *)ax); b = *((const struct property * const *)bx); return strcmp(a->name, b->name); } static void sort_properties(struct node *node) { int n = 0, i = 0; struct property *prop, **tbl; for_each_property_withdel(node, prop) n++; if (n == 0) return; tbl = xmalloc(n * sizeof(*tbl)); for_each_property_withdel(node, prop) tbl[i++] = prop; qsort(tbl, n, sizeof(*tbl), cmp_prop); node->proplist = tbl[0]; for (i = 0; i < (n-1); i++) tbl[i]->next = tbl[i+1]; tbl[n-1]->next = NULL; free(tbl); } static int cmp_subnode(const void *ax, const void *bx) { const struct node *a, *b; a = *((const struct node * const *)ax); b = *((const struct node * const *)bx); return strcmp(a->name, b->name); } static void sort_subnodes(struct node *node) { int n = 0, i = 0; struct node *subnode, **tbl; for_each_child_withdel(node, subnode) n++; if (n == 0) return; tbl = xmalloc(n * sizeof(*tbl)); for_each_child_withdel(node, subnode) tbl[i++] = subnode; qsort(tbl, n, sizeof(*tbl), cmp_subnode); node->children = tbl[0]; for (i = 0; i < (n-1); i++) tbl[i]->next_sibling = tbl[i+1]; tbl[n-1]->next_sibling = NULL; free(tbl); } static void sort_node(struct node *node) { struct node *c; sort_properties(node); sort_subnodes(node); for_each_child_withdel(node, c) sort_node(c); } void sort_tree(struct dt_info *dti) { sort_reserve_entries(dti); sort_node(dti->dt); } /* utility helper to avoid code duplication */ static struct node *build_and_name_child_node(struct node *parent, const char *name) { struct node *node; node = build_node(NULL, NULL, NULL); name_node(node, name); add_child(parent, node); return node; } static struct node *build_root_node(struct node *dt, const char *name) { struct node *an; an = get_subnode(dt, name); if (!an) an = build_and_name_child_node(dt, name); if (!an) die("Could not build root node /%s\n", name); return an; } static bool any_label_tree(struct dt_info *dti, struct node *node) { struct node *c; if (node->labels) return true; for_each_child(node, c) if (any_label_tree(dti, c)) return true; return false; } static void generate_label_tree_internal(struct dt_info *dti, struct node *an, struct node *node, bool allocph) { struct node *dt = dti->dt; struct node *c; struct property *p; struct label *l; /* if there are labels */ if (node->labels) { /* now add the label in the node */ for_each_label(node->labels, l) { /* check whether the label already exists */ p = get_property(an, l->label); if (p) { fprintf(stderr, "WARNING: label %s already" " exists in /%s", l->label, an->name); continue; } /* insert it */ p = build_property(l->label, data_copy_escape_string(node->fullpath, strlen(node->fullpath)), NULL); add_property(an, p); } /* force allocation of a phandle for this node */ if (allocph) (void)get_node_phandle(dt, node); } for_each_child(node, c) generate_label_tree_internal(dti, an, c, allocph); } static bool any_fixup_tree(struct dt_info *dti, struct node *node) { struct node *c; struct property *prop; struct marker *m; for_each_property(node, prop) { m = prop->val.markers; for_each_marker_of_type(m, REF_PHANDLE) { if (!get_node_by_ref(dti->dt, m->ref)) return true; } } for_each_child(node, c) { if (any_fixup_tree(dti, c)) return true; } return false; } static void add_fixup_entry(struct dt_info *dti, struct node *fn, struct node *node, struct property *prop, struct marker *m) { char *entry; /* m->ref can only be a REF_PHANDLE, but check anyway */ assert(m->type == REF_PHANDLE); /* The format only permits fixups for references to label, not * references to path */ if (strchr(m->ref, '/')) die("Can't generate fixup for reference to path &{%s}\n", m->ref); /* there shouldn't be any ':' in the arguments */ if (strchr(node->fullpath, ':') || strchr(prop->name, ':')) die("arguments should not contain ':'\n"); xasprintf(&entry, "%s:%s:%u", node->fullpath, prop->name, m->offset); append_to_property(fn, m->ref, entry, strlen(entry) + 1, TYPE_STRING); free(entry); } static void generate_fixups_tree_internal(struct dt_info *dti, struct node *fn, struct node *node) { struct node *dt = dti->dt; struct node *c; struct property *prop; struct marker *m; struct node *refnode; for_each_property(node, prop) { m = prop->val.markers; for_each_marker_of_type(m, REF_PHANDLE) { refnode = get_node_by_ref(dt, m->ref); if (!refnode) add_fixup_entry(dti, fn, node, prop, m); } } for_each_child(node, c) generate_fixups_tree_internal(dti, fn, c); } static bool any_local_fixup_tree(struct dt_info *dti, struct node *node) { struct node *c; struct property *prop; struct marker *m; for_each_property(node, prop) { m = prop->val.markers; for_each_marker_of_type(m, REF_PHANDLE) { if (get_node_by_ref(dti->dt, m->ref)) return true; } } for_each_child(node, c) { if (any_local_fixup_tree(dti, c)) return true; } return false; } static void add_local_fixup_entry(struct dt_info *dti, struct node *lfn, struct node *node, struct property *prop, struct marker *m, struct node *refnode) { struct node *wn, *nwn; /* local fixup node, walk node, new */ fdt32_t value_32; char **compp; int i, depth; /* walk back retrieving depth */ depth = 0; for (wn = node; wn; wn = wn->parent) depth++; /* allocate name array */ compp = xmalloc(sizeof(*compp) * depth); /* store names in the array */ for (wn = node, i = depth - 1; wn; wn = wn->parent, i--) compp[i] = wn->name; /* walk the path components creating nodes if they don't exist */ for (wn = lfn, i = 1; i < depth; i++, wn = nwn) { /* if no node exists, create it */ nwn = get_subnode(wn, compp[i]); if (!nwn) nwn = build_and_name_child_node(wn, compp[i]); } free(compp); value_32 = cpu_to_fdt32(m->offset); append_to_property(wn, prop->name, &value_32, sizeof(value_32), TYPE_UINT32); } static void generate_local_fixups_tree_internal(struct dt_info *dti, struct node *lfn, struct node *node) { struct node *dt = dti->dt; struct node *c; struct property *prop; struct marker *m; struct node *refnode; for_each_property(node, prop) { m = prop->val.markers; for_each_marker_of_type(m, REF_PHANDLE) { refnode = get_node_by_ref(dt, m->ref); if (refnode) add_local_fixup_entry(dti, lfn, node, prop, m, refnode); } } for_each_child(node, c) generate_local_fixups_tree_internal(dti, lfn, c); } void generate_label_tree(struct dt_info *dti, const char *name, bool allocph) { if (!any_label_tree(dti, dti->dt)) return; generate_label_tree_internal(dti, build_root_node(dti->dt, name), dti->dt, allocph); } void generate_fixups_tree(struct dt_info *dti, const char *name) { if (!any_fixup_tree(dti, dti->dt)) return; generate_fixups_tree_internal(dti, build_root_node(dti->dt, name), dti->dt); } void generate_local_fixups_tree(struct dt_info *dti, const char *name) { if (!any_local_fixup_tree(dti, dti->dt)) return; generate_local_fixups_tree_internal(dti, build_root_node(dti->dt, name), dti->dt); }