3 files changed, 34 insertions, 3 deletions
diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h
index d109ed3119..a1d1a29842 100644
--- a/include/linux/kconfig.h
+++ b/include/linux/kconfig.h
@@ -31,11 +31,14 @@
 	(config_enabled(option))
 
 /*
- * U-Boot add-on: Helper macros to reference to different macros
- * (CONFIG_ or CONFIG_SPL_ prefixed), depending on the build context.
+ * U-Boot add-on: Helper macros to reference to different macros (prefixed by
+ * CONFIG_, CONFIG_SPL_, CONFIG_TPL_ or CONFIG_TOOLS_), depending on the build
+ * context.
  */
 
-#if defined(CONFIG_TPL_BUILD)
+#ifdef USE_HOSTCC
+#define _CONFIG_PREFIX TOOLS_
+#elif defined(CONFIG_TPL_BUILD)
 #define _CONFIG_PREFIX TPL_
 #elif defined(CONFIG_SPL_BUILD)
 #define _CONFIG_PREFIX SPL_
@@ -49,6 +52,7 @@
 
 /*
  * CONFIG_VAL(FOO) evaluates to the value of
+ *  CONFIG_TOOLS_FOO if USE_HOSTCC is defined,
  *  CONFIG_FOO if CONFIG_SPL_BUILD is undefined,
  *  CONFIG_SPL_FOO if CONFIG_SPL_BUILD is defined.
  *  CONFIG_TPL_FOO if CONFIG_TPL_BUILD is defined.
@@ -76,18 +80,21 @@
 
 /*
  * CONFIG_IS_ENABLED(FOO) expands to
+ *  1 if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y',
  *  1 if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
  *  1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
  *  1 if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
  *  0 otherwise.
  *
  * CONFIG_IS_ENABLED(FOO, (abc)) expands to
+ *  abc if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y',
  *  abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
  *  abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
  *  abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
  *  nothing otherwise.
  *
  * CONFIG_IS_ENABLED(FOO, (abc), (def)) expands to
+ *  abc if USE_HOSTCC is defined and CONFIG_TOOLS_FOO is set to 'y',
  *  abc if CONFIG_SPL_BUILD is undefined and CONFIG_FOO is set to 'y',
  *  abc if CONFIG_SPL_BUILD is defined and CONFIG_SPL_FOO is set to 'y',
  *  abc if CONFIG_TPL_BUILD is defined and CONFIG_TPL_FOO is set to 'y',
diff --git a/include/linux/string.h b/include/linux/string.h
index dd255f2163..3169c93796 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -129,6 +129,19 @@ extern void * memchr(const void *,int,__kernel_size_t);
 void *memchr_inv(const void *, int, size_t);
 #endif
 
+/**
+ * memdup() - allocate a buffer and copy in the contents
+ *
+ * Note that this returns a valid pointer even if @len is 0
+ *
+ * @src: data to copy in
+ * @len: number of bytes to copy
+ * @return allocated buffer with the copied contents, or NULL if not enough
+ *	memory is available
+ *
+ */
+char *memdup(const void *src, size_t len);
+
 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base);
 unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base);
 
diff --git a/include/linux/zstd.h b/include/linux/zstd.h
index 724f69350e..35ba4c90aa 100644
--- a/include/linux/zstd.h
+++ b/include/linux/zstd.h
@@ -1144,4 +1144,15 @@ size_t ZSTD_decompressBlock(ZSTD_DCtx *dctx, void *dst, size_t dstCapacity,
 size_t ZSTD_insertBlock(ZSTD_DCtx *dctx, const void *blockStart,
 	size_t blockSize);
 
+struct abuf;
+
+/**
+ * zstd_decompress() - Decompress Zstandard data
+ *
+ * @in: Input buffer to decompress
+ * @out: Output buffer to hold the results (must be large enough)
+ * @return size of the decompressed data, or -ve on error
+ */
+int zstd_decompress(struct abuf *in, struct abuf *out);
+
 #endif  /* ZSTD_H */