powerpc/boot: Add support for XZ compression

This patch adds an option to use XZ compression for the kernel image.

Currently this is only enabled for 64-bit Book3S targets, which is
roughly equivalent to the platforms that use the kernel's zImage
wrapper, and that have been tested.

The bulk of the 32-bit platforms and 64-bit BookE use uboot images,
which relies on uboot implementing XZ. In future we can enable XZ
support for those targets once someone has tested it.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Oliver O'Halloran 2016-09-22 16:54:34 +10:00 committed by Michael Ellerman
parent f1e510bbb9
commit c762c69e10
7 changed files with 89 additions and 0 deletions

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@ -20,6 +20,7 @@
all: $(obj)/zImage
compress-$(CONFIG_KERNEL_GZIP) := CONFIG_KERNEL_GZIP
compress-$(CONFIG_KERNEL_XZ) := CONFIG_KERNEL_XZ
BOOTCFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-fno-strict-aliasing -Os -msoft-float -pipe \
@ -226,6 +227,7 @@ endif
endif
compressor-$(CONFIG_KERNEL_GZIP) := gz
compressor-$(CONFIG_KERNEL_XZ) := xz
# args (to if_changed): 1 = (this rule), 2 = platform, 3 = dts 4=dtb 5=initrd
quiet_cmd_wrap = WRAP $@
@ -433,6 +435,7 @@ clean-files += $(image-) $(initrd-) cuImage.* dtbImage.* treeImage.* \
# clean up files cached by wrapper
clean-kernel-base := vmlinux.strip vmlinux.bin
clean-kernel := $(addsuffix .gz,$(clean-kernel-base))
clean-kernel += $(addsuffix .xz,$(clean-kernel-base))
# If not absolute clean-files are relative to $(obj).
clean-files += $(addprefix $(objtree)/, $(clean-kernel))

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@ -37,6 +37,11 @@
# include "decompress_inflate.c"
#endif
#ifdef CONFIG_KERNEL_XZ
# include "xz_config.h"
# include "../../../lib/decompress_unxz.c"
#endif
/* globals for tracking the state of the decompression */
static unsigned long decompressed_bytes;
static unsigned long limit;

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@ -0,0 +1,14 @@
/*
* Copyright (C) IBM Corporation 2016.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* This file is only necessary because some of the pre-boot decompressors
* expect stdbool.h to be available.
*
*/
#include "types.h"

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@ -0,0 +1,13 @@
/*
* Copyright (C) IBM Corporation 2016.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* This file is only necessary because some of the pre-boot decompressors
* expect stdint.h to be available.
*/
#include "types.h"

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@ -1,6 +1,8 @@
#ifndef _TYPES_H_
#define _TYPES_H_
#include <stdbool.h>
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
typedef unsigned char u8;
@ -34,4 +36,16 @@ typedef s64 int64_t;
(void) (&_x == &_y); \
_x > _y ? _x : _y; })
#define min_t(type, a, b) min(((type) a), ((type) b))
#define max_t(type, a, b) max(((type) a), ((type) b))
typedef int bool;
#ifndef true
#define true 1
#endif
#ifndef false
#define false 0
#endif
#endif /* _TYPES_H_ */

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@ -0,0 +1,39 @@
#ifndef __XZ_CONFIG_H__
#define __XZ_CONFIG_H__
/*
* most of this is copied from lib/xz/xz_private.h, we can't use their defines
* since the boot wrapper is not built in the same environment as the rest of
* the kernel.
*/
#include "types.h"
#include "swab.h"
static inline uint32_t swab32p(void *p)
{
uint32_t *q = p;
return swab32(*q);
}
#ifdef __LITTLE_ENDIAN__
#define get_le32(p) (*((uint32_t *) (p)))
#else
#define get_le32(p) swab32p(p)
#endif
#define memeq(a, b, size) (memcmp(a, b, size) == 0)
#define memzero(buf, size) memset(buf, 0, size)
/* prevent the inclusion of the xz-preboot MM headers */
#define DECOMPR_MM_H
#define memmove memmove
#define XZ_EXTERN static
/* xz.h needs to be included directly since we need enum xz_mode */
#include "../../../include/linux/xz.h"
#undef XZ_EXTERN
#endif

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@ -74,6 +74,7 @@ config PPC_BOOK3S_64
select HAVE_ARCH_TRANSPARENT_HUGEPAGE
select ARCH_SUPPORTS_NUMA_BALANCING
select IRQ_WORK
select HAVE_KERNEL_XZ
config PPC_BOOK3E_64
bool "Embedded processors"