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@@ -0,0 +1,156 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * (C) Copyright 2018 Linaro Ltd.
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+ * Sam Protsenko <semen.protsenko@linaro.org>
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+ */
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+
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+#include <image-android-dt.h>
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+#include <dt_table.h>
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+#include <common.h>
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+#include <linux/libfdt.h>
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+#include <mapmem.h>
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+
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+/**
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+ * Check if image header is correct.
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+ *
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+ * @param hdr_addr Start address of DT image
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+ * @return true if header is correct or false if header is incorrect
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+ */
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+bool android_dt_check_header(ulong hdr_addr)
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+{
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+ const struct dt_table_header *hdr;
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+ u32 magic;
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+
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+ hdr = map_sysmem(hdr_addr, sizeof(*hdr));
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+ magic = fdt32_to_cpu(hdr->magic);
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+ unmap_sysmem(hdr);
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+
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+ return magic == DT_TABLE_MAGIC;
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+}
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+
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+/**
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+ * Get the address of FDT (dtb or dtbo) in memory by its index in image.
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+ *
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+ * @param hdr_addr Start address of DT image
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+ * @param index Index of desired FDT in image (starting from 0)
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+ * @param[out] addr If not NULL, will contain address to specified FDT
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+ * @param[out] size If not NULL, will contain size of specified FDT
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+ *
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+ * @return true on success or false on error
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+ */
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+bool android_dt_get_fdt_by_index(ulong hdr_addr, u32 index, ulong *addr,
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+ u32 *size)
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+{
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+ const struct dt_table_header *hdr;
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+ const struct dt_table_entry *e;
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+ u32 entry_count, entries_offset, entry_size;
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+ ulong e_addr;
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+ u32 dt_offset, dt_size;
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+
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+ hdr = map_sysmem(hdr_addr, sizeof(*hdr));
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+ entry_count = fdt32_to_cpu(hdr->dt_entry_count);
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+ entries_offset = fdt32_to_cpu(hdr->dt_entries_offset);
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+ entry_size = fdt32_to_cpu(hdr->dt_entry_size);
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+ unmap_sysmem(hdr);
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+
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+ if (index > entry_count) {
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+ printf("Error: index > dt_entry_count (%u > %u)\n", index,
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+ entry_count);
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+ return false;
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+ }
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+
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+ e_addr = hdr_addr + entries_offset + index * entry_size;
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+ e = map_sysmem(e_addr, sizeof(*e));
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+ dt_offset = fdt32_to_cpu(e->dt_offset);
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+ dt_size = fdt32_to_cpu(e->dt_size);
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+ unmap_sysmem(e);
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+
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+ if (addr)
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+ *addr = hdr_addr + dt_offset;
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+ if (size)
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+ *size = dt_size;
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+
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+ return true;
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+}
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+
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+#if !defined(CONFIG_SPL_BUILD)
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+static void android_dt_print_fdt_info(const struct fdt_header *fdt)
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+{
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+ u32 fdt_size;
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+ int root_node_off;
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+ const char *compatible = NULL;
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+
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+ fdt_size = fdt_totalsize(fdt);
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+ root_node_off = fdt_path_offset(fdt, "/");
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+ if (root_node_off < 0) {
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+ printf("Error: Root node not found\n");
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+ } else {
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+ compatible = fdt_getprop(fdt, root_node_off, "compatible",
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+ NULL);
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+ }
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+
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+ printf(" (FDT)size = %d\n", fdt_size);
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+ printf(" (FDT)compatible = %s\n",
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+ compatible ? compatible : "(unknown)");
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+}
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+
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+/**
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+ * Print information about DT image structure.
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+ *
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+ * @param hdr_addr Start address of DT image
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+ */
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+void android_dt_print_contents(ulong hdr_addr)
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+{
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+ const struct dt_table_header *hdr;
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+ u32 entry_count, entries_offset, entry_size;
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+ u32 i;
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+
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+ hdr = map_sysmem(hdr_addr, sizeof(*hdr));
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+ entry_count = fdt32_to_cpu(hdr->dt_entry_count);
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+ entries_offset = fdt32_to_cpu(hdr->dt_entries_offset);
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+ entry_size = fdt32_to_cpu(hdr->dt_entry_size);
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+
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+ /* Print image header info */
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+ printf("dt_table_header:\n");
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+ printf(" magic = %08x\n", fdt32_to_cpu(hdr->magic));
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+ printf(" total_size = %d\n", fdt32_to_cpu(hdr->total_size));
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+ printf(" header_size = %d\n", fdt32_to_cpu(hdr->header_size));
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+ printf(" dt_entry_size = %d\n", entry_size);
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+ printf(" dt_entry_count = %d\n", entry_count);
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+ printf(" dt_entries_offset = %d\n", entries_offset);
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+ printf(" page_size = %d\n", fdt32_to_cpu(hdr->page_size));
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+ printf(" version = %d\n", fdt32_to_cpu(hdr->version));
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+
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+ unmap_sysmem(hdr);
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+
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+ /* Print image entries info */
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+ for (i = 0; i < entry_count; ++i) {
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+ const ulong e_addr = hdr_addr + entries_offset + i * entry_size;
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+ const struct dt_table_entry *e;
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+ const struct fdt_header *fdt;
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+ u32 dt_offset, dt_size;
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+ u32 j;
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+
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+ e = map_sysmem(e_addr, sizeof(*e));
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+ dt_offset = fdt32_to_cpu(e->dt_offset);
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+ dt_size = fdt32_to_cpu(e->dt_size);
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+
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+ printf("dt_table_entry[%d]:\n", i);
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+ printf(" dt_size = %d\n", dt_size);
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+ printf(" dt_offset = %d\n", dt_offset);
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+ printf(" id = %08x\n", fdt32_to_cpu(e->id));
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+ printf(" rev = %08x\n", fdt32_to_cpu(e->rev));
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+ for (j = 0; j < 4; ++j) {
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+ printf(" custom[%d] = %08x\n", j,
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+ fdt32_to_cpu(e->custom[j]));
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+ }
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+
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+ unmap_sysmem(e);
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+
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+ /* Print FDT info for this entry */
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+ fdt = map_sysmem(hdr_addr + dt_offset, sizeof(*fdt));
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+ android_dt_print_fdt_info(fdt);
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+ unmap_sysmem(fdt);
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+ }
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+}
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+#endif
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