ext lib: add libfdt to enable flattened device tree support

this patch adds libfdt, a library necessary for supporting
flattened device tree support in current and future versions of
the linux/android kernel for ARM.

1 files changed, 235 insertions, 0 deletions

diff --git a/ext/libfdt/fdt_sw.c b/ext/libfdt/fdt_sw.c
new file mode 100644
index 000000000..eb4cad654
--- /dev/null
+++ b/ext/libfdt/fdt_sw.c
@@ -0,0 +1,235 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *     2. Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.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;
+}