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