diff options
Diffstat (limited to 'scripts/dtc/libfdt/fdt_rw.c')
| -rw-r--r-- | scripts/dtc/libfdt/fdt_rw.c | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/scripts/dtc/libfdt/fdt_rw.c b/scripts/dtc/libfdt/fdt_rw.c new file mode 100644 index 000000000..68887b969 --- /dev/null +++ b/scripts/dtc/libfdt/fdt_rw.c @@ -0,0 +1,492 @@ +// 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 */ + fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */ + 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 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), + fdt_size_dt_strings(old)); + 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 { + struct_size = 0; + while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END) + ; + if (struct_size < 0) + return struct_size; + } + + 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); + 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_set_totalsize(fdt, fdt_data_size_(fdt)); + + return 0; +} |