loader: Support Flattened Image Trees (FIT images)

Introduce support for loading Flattened Image Trees, as used by modern
U-Boot. FIT images are essentially flattened device tree files which
contain binary images such as kernels, FDTs or ramdisks along with one
or more configuration nodes describing boot configurations.

The MIPS Boston board typically boots kernels in the form of FIT images,
and will make use of this code.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
[yongbok.kim@imgtec.com:
  fixed potential memory leaks,
  isolated building option]
Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>

2 files changed, 47 insertions, 0 deletions

diff --git a/include/hw/loader-fit.h b/include/hw/loader-fit.h
new file mode 100644
index 0000000..9e2a068
--- /dev/null
+++ b/include/hw/loader-fit.h
@@ -0,0 +1,41 @@
+/*
+ * Flattened Image Tree loader.
+ *
+ * Copyright (c) 2016 Imagination Technologies
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HW_LOADER_FIT_H
+#define HW_LOADER_FIT_H
+
+#include <exec/hwaddr.h>
+
+struct fit_loader_match {
+    const char *compatible;
+    const void *data;
+};
+
+struct fit_loader {
+    const struct fit_loader_match *matches;
+    hwaddr (*addr_to_phys)(void *opaque, uint64_t addr);
+    const void *(*fdt_filter)(void *opaque, const void *fdt,
+                              const void *match_data, hwaddr *load_addr);
+    const void *(*kernel_filter)(void *opaque, const void *kernel,
+                                 hwaddr *load_addr, hwaddr *entry_addr);
+};
+
+int load_fit(const struct fit_loader *ldr, const char *filename, void *opaque);
+
+#endif /* HW_LOADER_FIT_H */
diff --git a/include/hw/loader.h b/include/hw/loader.h
index 0dbd8d6..40c4153 100644
--- a/include/hw/loader.h
+++ b/include/hw/loader.h
@@ -164,6 +164,8 @@ int load_uimage(const char *filename, hwaddr *ep,
  */
 int load_ramdisk(const char *filename, hwaddr addr, uint64_t max_sz);
 
+ssize_t gunzip(void *dst, size_t dstlen, uint8_t *src, size_t srclen);
+
 ssize_t read_targphys(const char *name,
                       int fd, hwaddr dst_addr, size_t nbytes);
 void pstrcpy_targphys(const char *name,
@@ -214,4 +216,8 @@ void hmp_info_roms(Monitor *mon, const QDict *qdict);
 int rom_add_vga(const char *file);
 int rom_add_option(const char *file, int32_t bootindex);
 
+/* This is the usual maximum in uboot, so if a uImage overflows this, it would
+ * overflow on real hardware too. */
+#define UBOOT_MAX_GUNZIP_BYTES (64 << 20)
+
 #endif