// SPDX-License-Identifier: GPL-2.0
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/*
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* Definitions and wrapper functions for kernel decompressor
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*
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* Copyright IBM Corp. 2010
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/uaccess.h>
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#include <asm/page.h>
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#include <asm/sclp.h>
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#include <asm/ipl.h>
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#include "sizes.h"
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/*
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* gzip declarations
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*/
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#define STATIC static
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#undef memset
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#undef memcpy
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#undef memmove
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#define memmove memmove
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#define memzero(s, n) memset((s), 0, (n))
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/* Symbols defined by linker scripts */
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extern char input_data[];
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extern int input_len;
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extern char _end[];
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extern char _bss[], _ebss[];
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static void error(char *m);
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static unsigned long free_mem_ptr;
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static unsigned long free_mem_end_ptr;
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#ifdef CONFIG_HAVE_KERNEL_BZIP2
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#define HEAP_SIZE 0x400000
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#else
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#define HEAP_SIZE 0x10000
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#endif
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#ifdef CONFIG_KERNEL_GZIP
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#include "../../../../lib/decompress_inflate.c"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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#include "../../../../lib/decompress_bunzip2.c"
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#endif
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#ifdef CONFIG_KERNEL_LZ4
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#include "../../../../lib/decompress_unlz4.c"
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#endif
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#ifdef CONFIG_KERNEL_LZMA
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#include "../../../../lib/decompress_unlzma.c"
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#endif
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#ifdef CONFIG_KERNEL_LZO
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#include "../../../../lib/decompress_unlzo.c"
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#endif
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#ifdef CONFIG_KERNEL_XZ
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#include "../../../../lib/decompress_unxz.c"
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#endif
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static int puts(const char *s)
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{
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sclp_early_printk(s);
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return 0;
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}
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static void error(char *x)
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{
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unsigned long long psw = 0x000a0000deadbeefULL;
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puts("\n\n");
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puts(x);
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puts("\n\n -- System halted");
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asm volatile("lpsw %0" : : "Q" (psw));
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}
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unsigned long decompress_kernel(void)
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{
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void *output, *kernel_end;
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output = (void *) ALIGN((unsigned long) _end + HEAP_SIZE, PAGE_SIZE);
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kernel_end = output + SZ__bss_start;
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#ifdef CONFIG_BLK_DEV_INITRD
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/*
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* Move the initrd right behind the end of the decompressed
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* kernel image. This also prevents initrd corruption caused by
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* bss clearing since kernel_end will always be located behind the
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* current bss section..
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*/
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if (INITRD_START && INITRD_SIZE && kernel_end > (void *) INITRD_START) {
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memmove(kernel_end, (void *) INITRD_START, INITRD_SIZE);
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INITRD_START = (unsigned long) kernel_end;
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}
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#endif
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/*
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* Clear bss section. free_mem_ptr and free_mem_end_ptr need to be
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* initialized afterwards since they reside in bss.
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*/
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memset(_bss, 0, _ebss - _bss);
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free_mem_ptr = (unsigned long) _end;
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free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
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__decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
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return (unsigned long) output;
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}
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