[POWERPC] zImage: Add more flexible gunzip convenience functions

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At present, arch/powerpc/boot/main.c includes a gunzip() function
which is a convenient wrapper around zlib.  However, it doesn't
conveniently allow decompressing part of an image to one location,
then the remainder to a different address.

This patch adds a new set of more flexible convenience wrappers around
zlib, moving them to their own file, gunzip_util.c, in the process.
These wrappers allow decompressing sections of the compressed image to
different locations.  In addition, they transparently handle
uncompressed data, avoiding special case code to handle uncompressed
vmlinux images.

The patch also converts main.c to use the new wrappers, using the new
flexibility to avoid decompressing the vmlinux's ELF header twice as
we did previously.  That in turn means we avoid extending our
allocations for the vmlinux to allow space for the extra copy of the
ELF header.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

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This commit is contained in:

David Gibson 2007-03-05 14:24:52 +11:00 • committed by Paul Mackerras

parent cfbff8a380

commit ad9d2716cf

4 changed files with 192 additions and 94 deletions

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3

arch/powerpc/boot/Makefile

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140

arch/powerpc/boot/gunzip_util.c

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30

arch/powerpc/boot/gunzip_util.h

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113

arch/powerpc/boot/main.c

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