From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 4/7] decompressor: import malloc/free implementation for linux 3.4
Date: Sun, 22 Jul 2012 16:02:45 +0200 [thread overview]
Message-ID: <1342965768-3796-4-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <1342965768-3796-1-git-send-email-plagnioj@jcrosoft.com>
This is need for gunzip support
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
include/linux/decompress/mm.h | 68 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)
create mode 100644 include/linux/decompress/mm.h
diff --git a/include/linux/decompress/mm.h b/include/linux/decompress/mm.h
new file mode 100644
index 0000000..0c35411
--- /dev/null
+++ b/include/linux/decompress/mm.h
@@ -0,0 +1,68 @@
+/*
+ * linux/compr_mm.h
+ *
+ * Memory management for pre-boot and ramdisk uncompressors
+ *
+ * Authors: Alain Knaff <alain@knaff.lu>
+ *
+ */
+
+#ifndef DECOMPR_MM_H
+#define DECOMPR_MM_H
+
+#ifdef STATIC
+
+/* Code active when included from pre-boot environment: */
+
+/*
+ * Some architectures want to ensure there is no local data in their
+ * pre-boot environment, so that data can arbitrarily relocated (via
+ * GOT references). This is achieved by defining STATIC_RW_DATA to
+ * be null.
+ */
+#ifndef STATIC_RW_DATA
+#define STATIC_RW_DATA static
+#endif
+
+/* A trivial malloc implementation, adapted from
+ * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
+ */
+STATIC_RW_DATA unsigned long malloc_ptr;
+STATIC_RW_DATA int malloc_count;
+
+static void *malloc(int size)
+{
+ void *p;
+
+ if (size < 0)
+ return NULL;
+ if (!malloc_ptr)
+ malloc_ptr = free_mem_ptr;
+
+ malloc_ptr = (malloc_ptr + 3) & ~3; /* Align */
+
+ p = (void *)malloc_ptr;
+ malloc_ptr += size;
+
+ if (free_mem_end_ptr && malloc_ptr >= free_mem_end_ptr)
+ return NULL;
+
+ malloc_count++;
+ return p;
+}
+
+static void free(void *where)
+{
+ malloc_count--;
+ if (!malloc_count)
+ malloc_ptr = free_mem_ptr;
+}
+
+#define large_malloc(a) malloc(a)
+#define large_free(a) free(a)
+
+#define INIT
+
+#endif /* STATIC */
+
+#endif /* DECOMPR_MM_H */
--
1.7.10
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next prev parent reply other threads:[~2012-07-22 14:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-22 13:03 [PATCH 0/7] compressed image update Jean-Christophe PLAGNIOL-VILLARD
2012-07-22 14:02 ` [PATCH 1/7] stddev: make it selectable via Kconfig Jean-Christophe PLAGNIOL-VILLARD
2012-07-22 14:02 ` [PATCH 2/7] decompress_unlzo: define decompress_unlzo as decompress Jean-Christophe PLAGNIOL-VILLARD
2012-07-22 14:02 ` [PATCH 3/7] compressed image: factorise compressor type Jean-Christophe PLAGNIOL-VILLARD
2012-07-22 14:02 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-07-22 14:02 ` [PATCH 5/7] ARM: add early malloc support needed by the decompressor Jean-Christophe PLAGNIOL-VILLARD
2012-07-22 14:02 ` [PATCH 6/7] compressed: allow to link only what is needed Jean-Christophe PLAGNIOL-VILLARD
2012-07-22 14:02 ` [PATCH 7/7] compressed image: add gzip support Jean-Christophe PLAGNIOL-VILLARD
2012-07-23 4:20 [PATCH 0/7 V2] compressed image update Jean-Christophe PLAGNIOL-VILLARD
2012-07-23 4:25 ` [PATCH 1/7] stddev: make it selectable via Kconfig Jean-Christophe PLAGNIOL-VILLARD
2012-07-23 4:26 ` [PATCH 4/7] decompressor: import malloc/free implementation for linux 3.4 Jean-Christophe PLAGNIOL-VILLARD
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