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-rw-r--r--lib/libfdt/fdt_rw.c500
1 files changed, 500 insertions, 0 deletions
diff --git a/lib/libfdt/fdt_rw.c b/lib/libfdt/fdt_rw.c
new file mode 100644
index 0000000..3621d36
--- /dev/null
+++ b/lib/libfdt/fdt_rw.c
@@ -0,0 +1,500 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+static int fdt_blocks_misordered_(const void *fdt,
+ int mem_rsv_size, int struct_size)
+{
+ return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
+ || (fdt_off_dt_struct(fdt) <
+ (fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
+ || (fdt_off_dt_strings(fdt) <
+ (fdt_off_dt_struct(fdt) + struct_size))
+ || (fdt_totalsize(fdt) <
+ (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
+}
+
+static int fdt_rw_probe_(void *fdt)
+{
+ if (can_assume(VALID_DTB))
+ return 0;
+ FDT_RO_PROBE(fdt);
+
+ if (!can_assume(LATEST) && fdt_version(fdt) < 17)
+ return -FDT_ERR_BADVERSION;
+ if (fdt_blocks_misordered_(fdt, sizeof(struct fdt_reserve_entry),
+ fdt_size_dt_struct(fdt)))
+ return -FDT_ERR_BADLAYOUT;
+ if (!can_assume(LATEST) && fdt_version(fdt) > 17)
+ fdt_set_version(fdt, 17);
+
+ return 0;
+}
+
+#define FDT_RW_PROBE(fdt) \
+ { \
+ int err_; \
+ if ((err_ = fdt_rw_probe_(fdt)) != 0) \
+ return err_; \
+ }
+
+static inline unsigned int fdt_data_size_(void *fdt)
+{
+ return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
+}
+
+static int fdt_splice_(void *fdt, void *splicepoint, int oldlen, int newlen)
+{
+ char *p = splicepoint;
+ unsigned int dsize = fdt_data_size_(fdt);
+ size_t soff = p - (char *)fdt;
+
+ if ((oldlen < 0) || (soff + oldlen < soff) || (soff + oldlen > dsize))
+ return -FDT_ERR_BADOFFSET;
+ if ((p < (char *)fdt) || (dsize + newlen < (unsigned)oldlen))
+ return -FDT_ERR_BADOFFSET;
+ if (dsize - oldlen + newlen > fdt_totalsize(fdt))
+ return -FDT_ERR_NOSPACE;
+ memmove(p + newlen, p + oldlen, ((char *)fdt + dsize) - (p + oldlen));
+ return 0;
+}
+
+static int fdt_splice_mem_rsv_(void *fdt, struct fdt_reserve_entry *p,
+ int oldn, int newn)
+{
+ int delta = (newn - oldn) * sizeof(*p);
+ int err;
+ err = fdt_splice_(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
+ if (err)
+ return err;
+ fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
+ fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
+ return 0;
+}
+
+static int fdt_splice_struct_(void *fdt, void *p,
+ int oldlen, int newlen)
+{
+ int delta = newlen - oldlen;
+ int err;
+
+ if ((err = fdt_splice_(fdt, p, oldlen, newlen)))
+ return err;
+
+ fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
+ fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
+ return 0;
+}
+
+/* Must only be used to roll back in case of error */
+static void fdt_del_last_string_(void *fdt, const char *s)
+{
+ int newlen = strlen(s) + 1;
+
+ fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) - newlen);
+}
+
+static int fdt_splice_string_(void *fdt, int newlen)
+{
+ void *p = (char *)fdt
+ + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
+ int err;
+
+ if ((err = fdt_splice_(fdt, p, 0, newlen)))
+ return err;
+
+ fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
+ return 0;
+}
+
+/**
+ * fdt_find_add_string_() - Find or allocate a string
+ *
+ * @fdt: pointer to the device tree to check/adjust
+ * @s: string to find/add
+ * @allocated: Set to 0 if the string was found, 1 if not found and so
+ * allocated. Ignored if can_assume(NO_ROLLBACK)
+ * @return offset of string in the string table (whether found or added)
+ */
+static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
+{
+ char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
+ const char *p;
+ char *new;
+ int len = strlen(s) + 1;
+ int err;
+
+ if (!can_assume(NO_ROLLBACK))
+ *allocated = 0;
+
+ p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s);
+ if (p)
+ /* found it */
+ return (p - strtab);
+
+ new = strtab + fdt_size_dt_strings(fdt);
+ err = fdt_splice_string_(fdt, len);
+ if (err)
+ return err;
+
+ if (!can_assume(NO_ROLLBACK))
+ *allocated = 1;
+
+ memcpy(new, s, len);
+ return (new - strtab);
+}
+
+int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
+{
+ struct fdt_reserve_entry *re;
+ int err;
+
+ FDT_RW_PROBE(fdt);
+
+ re = fdt_mem_rsv_w_(fdt, fdt_num_mem_rsv(fdt));
+ err = fdt_splice_mem_rsv_(fdt, re, 0, 1);
+ if (err)
+ return err;
+
+ re->address = cpu_to_fdt64(address);
+ re->size = cpu_to_fdt64(size);
+ return 0;
+}
+
+int fdt_del_mem_rsv(void *fdt, int n)
+{
+ struct fdt_reserve_entry *re = fdt_mem_rsv_w_(fdt, n);
+
+ FDT_RW_PROBE(fdt);
+
+ if (n >= fdt_num_mem_rsv(fdt))
+ return -FDT_ERR_NOTFOUND;
+
+ return fdt_splice_mem_rsv_(fdt, re, 1, 0);
+}
+
+static int fdt_resize_property_(void *fdt, int nodeoffset, const char *name,
+ int len, struct fdt_property **prop)
+{
+ int oldlen;
+ int err;
+
+ *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
+ if (!*prop)
+ return oldlen;
+
+ if ((err = fdt_splice_struct_(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
+ FDT_TAGALIGN(len))))
+ return err;
+
+ (*prop)->len = cpu_to_fdt32(len);
+ return 0;
+}
+
+static int fdt_add_property_(void *fdt, int nodeoffset, const char *name,
+ int len, struct fdt_property **prop)
+{
+ int proplen;
+ int nextoffset;
+ int namestroff;
+ int err;
+ int allocated;
+
+ if ((nextoffset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
+ return nextoffset;
+
+ namestroff = fdt_find_add_string_(fdt, name, &allocated);
+ if (namestroff < 0)
+ return namestroff;
+
+ *prop = fdt_offset_ptr_w_(fdt, nextoffset);
+ proplen = sizeof(**prop) + FDT_TAGALIGN(len);
+
+ err = fdt_splice_struct_(fdt, *prop, 0, proplen);
+ if (err) {
+ /* Delete the string if we failed to add it */
+ if (!can_assume(NO_ROLLBACK) && allocated)
+ fdt_del_last_string_(fdt, name);
+ return err;
+ }
+
+ (*prop)->tag = cpu_to_fdt32(FDT_PROP);
+ (*prop)->nameoff = cpu_to_fdt32(namestroff);
+ (*prop)->len = cpu_to_fdt32(len);
+ return 0;
+}
+
+int fdt_set_name(void *fdt, int nodeoffset, const char *name)
+{
+ char *namep;
+ int oldlen, newlen;
+ int err;
+
+ FDT_RW_PROBE(fdt);
+
+ namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
+ if (!namep)
+ return oldlen;
+
+ newlen = strlen(name);
+
+ err = fdt_splice_struct_(fdt, namep, FDT_TAGALIGN(oldlen+1),
+ FDT_TAGALIGN(newlen+1));
+ if (err)
+ return err;
+
+ memcpy(namep, name, newlen+1);
+ return 0;
+}
+
+int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
+ int len, void **prop_data)
+{
+ struct fdt_property *prop;
+ int err;
+
+ FDT_RW_PROBE(fdt);
+
+ err = fdt_resize_property_(fdt, nodeoffset, name, len, &prop);
+ if (err == -FDT_ERR_NOTFOUND)
+ err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
+ if (err)
+ return err;
+
+ *prop_data = prop->data;
+ return 0;
+}
+
+int fdt_setprop(void *fdt, int nodeoffset, const char *name,
+ const void *val, int len)
+{
+ void *prop_data;
+ int err;
+
+ err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data);
+ if (err)
+ return err;
+
+ if (len)
+ memcpy(prop_data, val, len);
+ return 0;
+}
+
+int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
+ const void *val, int len)
+{
+ struct fdt_property *prop;
+ int err, oldlen, newlen;
+
+ FDT_RW_PROBE(fdt);
+
+ prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
+ if (prop) {
+ newlen = len + oldlen;
+ err = fdt_splice_struct_(fdt, prop->data,
+ FDT_TAGALIGN(oldlen),
+ FDT_TAGALIGN(newlen));
+ if (err)
+ return err;
+ prop->len = cpu_to_fdt32(newlen);
+ memcpy(prop->data + oldlen, val, len);
+ } else {
+ err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
+ if (err)
+ return err;
+ memcpy(prop->data, val, len);
+ }
+ return 0;
+}
+
+int fdt_delprop(void *fdt, int nodeoffset, const char *name)
+{
+ struct fdt_property *prop;
+ int len, proplen;
+
+ FDT_RW_PROBE(fdt);
+
+ prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
+ if (!prop)
+ return len;
+
+ proplen = sizeof(*prop) + FDT_TAGALIGN(len);
+ return fdt_splice_struct_(fdt, prop, proplen, 0);
+}
+
+int fdt_add_subnode_namelen(void *fdt, int parentoffset,
+ const char *name, int namelen)
+{
+ struct fdt_node_header *nh;
+ int offset, nextoffset;
+ int nodelen;
+ int err;
+ uint32_t tag;
+ fdt32_t *endtag;
+
+ FDT_RW_PROBE(fdt);
+
+ offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
+ if (offset >= 0)
+ return -FDT_ERR_EXISTS;
+ else if (offset != -FDT_ERR_NOTFOUND)
+ return offset;
+
+ /* Try to place the new node after the parent's properties */
+ tag = fdt_next_tag(fdt, parentoffset, &nextoffset);
+ /* the fdt_subnode_offset_namelen() should ensure this never hits */
+ if (!can_assume(LIBFDT_FLAWLESS) && (tag != FDT_BEGIN_NODE))
+ return -FDT_ERR_INTERNAL;
+ do {
+ offset = nextoffset;
+ tag = fdt_next_tag(fdt, offset, &nextoffset);
+ } while ((tag == FDT_PROP) || (tag == FDT_NOP));
+
+ nh = fdt_offset_ptr_w_(fdt, offset);
+ nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
+
+ err = fdt_splice_struct_(fdt, nh, 0, nodelen);
+ if (err)
+ return err;
+
+ nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
+ memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
+ memcpy(nh->name, name, namelen);
+ endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
+ *endtag = cpu_to_fdt32(FDT_END_NODE);
+
+ return offset;
+}
+
+int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
+{
+ return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
+}
+
+int fdt_del_node(void *fdt, int nodeoffset)
+{
+ int endoffset;
+
+ FDT_RW_PROBE(fdt);
+
+ endoffset = fdt_node_end_offset_(fdt, nodeoffset);
+ if (endoffset < 0)
+ return endoffset;
+
+ return fdt_splice_struct_(fdt, fdt_offset_ptr_w_(fdt, nodeoffset),
+ endoffset - nodeoffset, 0);
+}
+
+static void fdt_packblocks_(const char *old, char *new,
+ int mem_rsv_size,
+ int struct_size,
+ int strings_size)
+{
+ int mem_rsv_off, struct_off, strings_off;
+
+ mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
+ struct_off = mem_rsv_off + mem_rsv_size;
+ strings_off = struct_off + struct_size;
+
+ memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
+ fdt_set_off_mem_rsvmap(new, mem_rsv_off);
+
+ memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
+ fdt_set_off_dt_struct(new, struct_off);
+ fdt_set_size_dt_struct(new, struct_size);
+
+ memmove(new + strings_off, old + fdt_off_dt_strings(old), strings_size);
+ fdt_set_off_dt_strings(new, strings_off);
+ fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
+}
+
+int fdt_open_into(const void *fdt, void *buf, int bufsize)
+{
+ int err;
+ int mem_rsv_size, struct_size;
+ int newsize;
+ const char *fdtstart = fdt;
+ const char *fdtend = fdtstart + fdt_totalsize(fdt);
+ char *tmp;
+
+ FDT_RO_PROBE(fdt);
+
+ mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
+ * sizeof(struct fdt_reserve_entry);
+
+ if (can_assume(LATEST) || fdt_version(fdt) >= 17) {
+ struct_size = fdt_size_dt_struct(fdt);
+ } else if (fdt_version(fdt) == 16) {
+ struct_size = 0;
+ while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
+ ;
+ if (struct_size < 0)
+ return struct_size;
+ } else {
+ return -FDT_ERR_BADVERSION;
+ }
+
+ if (can_assume(LIBFDT_ORDER) ||
+ !fdt_blocks_misordered_(fdt, mem_rsv_size, struct_size)) {
+ /* no further work necessary */
+ err = fdt_move(fdt, buf, bufsize);
+ if (err)
+ return err;
+ fdt_set_version(buf, 17);
+ fdt_set_size_dt_struct(buf, struct_size);
+ fdt_set_totalsize(buf, bufsize);
+ return 0;
+ }
+
+ /* Need to reorder */
+ newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
+ + struct_size + fdt_size_dt_strings(fdt);
+
+ if (bufsize < newsize)
+ return -FDT_ERR_NOSPACE;
+
+ /* First attempt to build converted tree at beginning of buffer */
+ tmp = buf;
+ /* But if that overlaps with the old tree... */
+ if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
+ /* Try right after the old tree instead */
+ tmp = (char *)(uintptr_t)fdtend;
+ if ((tmp + newsize) > ((char *)buf + bufsize))
+ return -FDT_ERR_NOSPACE;
+ }
+
+ fdt_packblocks_(fdt, tmp, mem_rsv_size, struct_size,
+ fdt_size_dt_strings(fdt));
+ memmove(buf, tmp, newsize);
+
+ fdt_set_magic(buf, FDT_MAGIC);
+ fdt_set_totalsize(buf, bufsize);
+ fdt_set_version(buf, 17);
+ fdt_set_last_comp_version(buf, 16);
+ fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
+
+ return 0;
+}
+
+int fdt_pack(void *fdt)
+{
+ int mem_rsv_size;
+
+ FDT_RW_PROBE(fdt);
+
+ mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
+ * sizeof(struct fdt_reserve_entry);
+ fdt_packblocks_(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt),
+ fdt_size_dt_strings(fdt));
+ fdt_set_totalsize(fdt, fdt_data_size_(fdt));
+
+ return 0;
+}