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// SPDX-License-Identifier: GPL-2.0
/*
* Definitions and wrapper functions for kernel decompressor
*
* Copyright IBM Corp. 2010
*
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#include <linux/uaccess.h>
#include <asm/page.h>
#include <asm/sclp.h>
#include <asm/ipl.h>
#include <asm/sections.h>
#include "decompressor.h"
/*
* gzip declarations
*/
#define STATIC static
#define STATIC_RW_DATA static __section(.data)
#undef memset
#undef memcpy
#undef memmove
#define memmove memmove
#define memzero(s, n) memset((s), 0, (n))
/* Symbols defined by linker scripts */
extern char _end[];
extern unsigned char _compressed_start[];
extern unsigned char _compressed_end[];
static void error(char *m);
#ifdef CONFIG_HAVE_KERNEL_BZIP2
#define HEAP_SIZE 0x400000
#else
#define HEAP_SIZE 0x10000
#endif
static unsigned long free_mem_ptr = (unsigned long) _end;
static unsigned long free_mem_end_ptr = (unsigned long) _end + HEAP_SIZE;
#ifdef CONFIG_KERNEL_GZIP
#include "../../../../lib/decompress_inflate.c"
#endif
#ifdef CONFIG_KERNEL_BZIP2
#include "../../../../lib/decompress_bunzip2.c"
#endif
#ifdef CONFIG_KERNEL_LZ4
#include "../../../../lib/decompress_unlz4.c"
#endif
#ifdef CONFIG_KERNEL_LZMA
#include "../../../../lib/decompress_unlzma.c"
#endif
#ifdef CONFIG_KERNEL_LZO
#include "../../../../lib/decompress_unlzo.c"
#endif
#ifdef CONFIG_KERNEL_XZ
#include "../../../../lib/decompress_unxz.c"
#endif
static int puts(const char *s)
{
sclp_early_printk(s);
return 0;
}
static void error(char *x)
{
unsigned long long psw = 0x000a0000deadbeefULL;
puts("\n\n");
puts(x);
puts("\n\n -- System halted");
asm volatile("lpsw %0" : : "Q" (psw));
}
#define decompress_offset ALIGN((unsigned long)_end + HEAP_SIZE, PAGE_SIZE)
unsigned long mem_safe_offset(void)
{
/*
* due to 4MB HEAD_SIZE for bzip2
* 'decompress_offset + vmlinux.image_size' could be larger than
* kernel at final position + its .bss, so take the larger of two
*/
return max(decompress_offset + vmlinux.image_size,
vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size);
}
void *decompress_kernel(void)
{
void *output = (void *)decompress_offset;
__decompress(_compressed_start, _compressed_end - _compressed_start,
NULL, NULL, output, 0, NULL, error);
return output;
}
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