Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* XIP kernel .data segment decompressor
|
|
*
|
|
* Created by: Nicolas Pitre, August 2017
|
|
* Copyright: (C) 2017 Linaro Limited
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/zutil.h>
|
|
#include "head.h"
|
|
|
|
/* for struct inflate_state */
|
|
#include "../../../lib/zlib_inflate/inftrees.h"
|
|
#include "../../../lib/zlib_inflate/inflate.h"
|
|
#include "../../../lib/zlib_inflate/infutil.h"
|
|
|
|
/*
|
|
* This code is called very early during the boot process to decompress
|
|
* the .data segment stored compressed in ROM. Therefore none of the global
|
|
* variables are valid yet, hence no kernel services such as memory
|
|
* allocation is available. Everything must be allocated on the stack and
|
|
* we must avoid any global data access. We use a temporary stack located
|
|
* in the .bss area. The linker script makes sure the .bss is big enough
|
|
* to hold our stack frame plus some room for called functions.
|
|
*
|
|
* We mimic the code in lib/decompress_inflate.c to use the smallest work
|
|
* area possible. And because everything is statically allocated on the
|
|
* stack then there is no need to clean up before returning.
|
|
*/
|
|
|
|
int __init __inflate_kernel_data(void)
|
|
{
|
|
struct z_stream_s stream, *strm = &stream;
|
|
struct inflate_state state;
|
|
char *in = __data_loc;
|
|
int rc;
|
|
|
|
/* Check and skip gzip header (assume no filename) */
|
|
if (in[0] != 0x1f || in[1] != 0x8b || in[2] != 0x08 || in[3] & ~3)
|
|
return -1;
|
|
in += 10;
|
|
|
|
strm->workspace = &state;
|
|
strm->next_in = in;
|
|
strm->avail_in = _edata_loc - __data_loc; /* upper bound */
|
|
strm->next_out = _sdata;
|
|
strm->avail_out = _edata_loc - __data_loc;
|
|
zlib_inflateInit2(strm, -MAX_WBITS);
|
|
WS(strm)->inflate_state.wsize = 0;
|
|
WS(strm)->inflate_state.window = NULL;
|
|
rc = zlib_inflate(strm, Z_FINISH);
|
|
if (rc == Z_OK || rc == Z_STREAM_END)
|
|
rc = strm->avail_out; /* should be 0 */
|
|
return rc;
|
|
}
|