--- /dev/null
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ * SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+static int _fdt_sw_check_header(void *fdt)
+{
+ if (fdt_magic(fdt) != FDT_SW_MAGIC)
+ return -FDT_ERR_BADMAGIC;
+ /* FIXME: should check more details about the header state */
+ return 0;
+}
+
+#define FDT_SW_CHECK_HEADER(fdt) \
+ { \
+ int err; \
+ if ((err = _fdt_sw_check_header(fdt)) != 0) \
+ return err; \
+ }
+
+static void *_fdt_grab_space(void *fdt, size_t len)
+{
+ int offset = fdt_size_dt_struct(fdt);
+ int spaceleft;
+
+ spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
+ - fdt_size_dt_strings(fdt);
+
+ if ((offset + len < offset) || (offset + len > spaceleft))
+ return NULL;
+
+ fdt_set_size_dt_struct(fdt, offset + len);
+ return _fdt_offset_ptr_w(fdt, offset);
+}
+
+int fdt_create(void *buf, int bufsize)
+{
+ void *fdt = buf;
+
+ if (bufsize < sizeof(struct fdt_header))
+ return -FDT_ERR_NOSPACE;
+
+ memset(buf, 0, bufsize);
+
+ fdt_set_magic(fdt, FDT_SW_MAGIC);
+ fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
+ fdt_set_last_comp_version(fdt, FDT_FIRST_SUPPORTED_VERSION);
+ fdt_set_totalsize(fdt, bufsize);
+
+ fdt_set_off_mem_rsvmap(fdt, FDT_ALIGN(sizeof(struct fdt_header),
+ sizeof(struct fdt_reserve_entry)));
+ fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt));
+ fdt_set_off_dt_strings(fdt, bufsize);
+
+ return 0;
+}
+
+int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
+{
+ struct fdt_reserve_entry *re;
+ int offset;
+
+ FDT_SW_CHECK_HEADER(fdt);
+
+ if (fdt_size_dt_struct(fdt))
+ return -FDT_ERR_BADSTATE;
+
+ offset = fdt_off_dt_struct(fdt);
+ if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
+ return -FDT_ERR_NOSPACE;
+
+ re = (struct fdt_reserve_entry *)((char *)fdt + offset);
+ re->address = cpu_to_fdt64(addr);
+ re->size = cpu_to_fdt64(size);
+
+ fdt_set_off_dt_struct(fdt, offset + sizeof(*re));
+
+ return 0;
+}
+
+int fdt_finish_reservemap(void *fdt)
+{
+ return fdt_add_reservemap_entry(fdt, 0, 0);
+}
+
+int fdt_begin_node(void *fdt, const char *name)
+{
+ struct fdt_node_header *nh;
+ int namelen = strlen(name) + 1;
+
+ FDT_SW_CHECK_HEADER(fdt);
+
+ nh = _fdt_grab_space(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen));
+ if (! nh)
+ return -FDT_ERR_NOSPACE;
+
+ nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
+ memcpy(nh->name, name, namelen);
+ return 0;
+}
+
+int fdt_end_node(void *fdt)
+{
+ fdt32_t *en;
+
+ FDT_SW_CHECK_HEADER(fdt);
+
+ en = _fdt_grab_space(fdt, FDT_TAGSIZE);
+ if (! en)
+ return -FDT_ERR_NOSPACE;
+
+ *en = cpu_to_fdt32(FDT_END_NODE);
+ return 0;
+}
+
+static int _fdt_find_add_string(void *fdt, const char *s)
+{
+ char *strtab = (char *)fdt + fdt_totalsize(fdt);
+ const char *p;
+ int strtabsize = fdt_size_dt_strings(fdt);
+ int len = strlen(s) + 1;
+ int struct_top, offset;
+
+ p = _fdt_find_string(strtab - strtabsize, strtabsize, s);
+ if (p)
+ return p - strtab;
+
+ /* Add it */
+ offset = -strtabsize - len;
+ struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
+ if (fdt_totalsize(fdt) + offset < struct_top)
+ return 0; /* no more room :( */
+
+ memcpy(strtab + offset, s, len);
+ fdt_set_size_dt_strings(fdt, strtabsize + len);
+ return offset;
+}
+
+int fdt_property(void *fdt, const char *name, const void *val, int len)
+{
+ struct fdt_property *prop;
+ int nameoff;
+
+ FDT_SW_CHECK_HEADER(fdt);
+
+ nameoff = _fdt_find_add_string(fdt, name);
+ if (nameoff == 0)
+ return -FDT_ERR_NOSPACE;
+
+ prop = _fdt_grab_space(fdt, sizeof(*prop) + FDT_TAGALIGN(len));
+ if (! prop)
+ return -FDT_ERR_NOSPACE;
+
+ prop->tag = cpu_to_fdt32(FDT_PROP);
+ prop->nameoff = cpu_to_fdt32(nameoff);
+ prop->len = cpu_to_fdt32(len);
+ memcpy(prop->data, val, len);
+ return 0;
+}
+
+int fdt_finish(void *fdt)
+{
+ char *p = (char *)fdt;
+ fdt32_t *end;
+ int oldstroffset, newstroffset;
+ uint32_t tag;
+ int offset, nextoffset;
+
+ FDT_SW_CHECK_HEADER(fdt);
+
+ /* Add terminator */
+ end = _fdt_grab_space(fdt, sizeof(*end));
+ if (! end)
+ return -FDT_ERR_NOSPACE;
+ *end = cpu_to_fdt32(FDT_END);
+
+ /* Relocate the string table */
+ oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt);
+ newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
+ memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt));
+ fdt_set_off_dt_strings(fdt, newstroffset);
+
+ /* Walk the structure, correcting string offsets */
+ offset = 0;
+ while ((tag = fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) {
+ if (tag == FDT_PROP) {
+ struct fdt_property *prop =
+ _fdt_offset_ptr_w(fdt, offset);
+ int nameoff;
+
+ nameoff = fdt32_to_cpu(prop->nameoff);
+ nameoff += fdt_size_dt_strings(fdt);
+ prop->nameoff = cpu_to_fdt32(nameoff);
+ }
+ offset = nextoffset;
+ }
+ if (nextoffset < 0)
+ return nextoffset;
+
+ /* Finally, adjust the header */
+ fdt_set_totalsize(fdt, newstroffset + fdt_size_dt_strings(fdt));
+ fdt_set_magic(fdt, FDT_MAGIC);
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff