LXR linux/arch/mips/boot/compressed/decompress.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright 2001 MontaVista Software Inc.
   4 * Author: Matt Porter <mporter@mvista.com>
   5 *
   6 * Copyright (C) 2009 Lemote, Inc.
   7 * Author: Wu Zhangjin <wuzhangjin@gmail.com>
   8 */
   9
  10#include <linux/types.h>
  11#include <linux/kernel.h>
  12#include <linux/string.h>
  13#include <linux/libfdt.h>
  14
  15#include <asm/addrspace.h>
  16
  17/*
  18 * These two variables specify the free mem region
  19 * that can be used for temporary malloc area
  20 */
  21unsigned long free_mem_ptr;
  22unsigned long free_mem_end_ptr;
  23
  24/* The linker tells us where the image is. */
  25extern unsigned char __image_begin, __image_end;
  26
  27/* debug interfaces  */
  28#ifdef CONFIG_DEBUG_ZBOOT
  29extern void puts(const char *s);
  30extern void puthex(unsigned long long val);
  31#else
  32#define puts(s) do {} while (0)
  33#define puthex(val) do {} while (0)
  34#endif
  35
  36extern char __appended_dtb[];
  37
  38void error(char *x)
  39{
  40        puts("\n\n");
  41        puts(x);
  42        puts("\n\n -- System halted");
  43
  44        while (1)
  45                ;       /* Halt */
  46}
  47
  48/* activate the code for pre-boot environment */
  49#define STATIC static
  50
  51#ifdef CONFIG_KERNEL_GZIP
  52#include "../../../../lib/decompress_inflate.c"
  53#endif
  54
  55#ifdef CONFIG_KERNEL_BZIP2
  56#include "../../../../lib/decompress_bunzip2.c"
  57#endif
  58
  59#ifdef CONFIG_KERNEL_LZ4
  60#include "../../../../lib/decompress_unlz4.c"
  61#endif
  62
  63#ifdef CONFIG_KERNEL_LZMA
  64#include "../../../../lib/decompress_unlzma.c"
  65#endif
  66
  67#ifdef CONFIG_KERNEL_LZO
  68#include "../../../../lib/decompress_unlzo.c"
  69#endif
  70
  71#ifdef CONFIG_KERNEL_XZ
  72#include "../../../../lib/decompress_unxz.c"
  73#endif
  74
  75const unsigned long __stack_chk_guard = 0x000a0dff;
  76
  77void __stack_chk_fail(void)
  78{
  79        error("stack-protector: Kernel stack is corrupted\n");
  80}
  81
  82void decompress_kernel(unsigned long boot_heap_start)
  83{
  84        unsigned long zimage_start, zimage_size;
  85
  86        zimage_start = (unsigned long)(&__image_begin);
  87        zimage_size = (unsigned long)(&__image_end) -
  88            (unsigned long)(&__image_begin);
  89
  90        puts("zimage at:     ");
  91        puthex(zimage_start);
  92        puts(" ");
  93        puthex(zimage_size + zimage_start);
  94        puts("\n");
  95
  96        /* This area are prepared for mallocing when decompressing */
  97        free_mem_ptr = boot_heap_start;
  98        free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
  99
 100        /* Display standard Linux/MIPS boot prompt */
 101        puts("Uncompressing Linux at load address ");
 102        puthex(VMLINUX_LOAD_ADDRESS_ULL);
 103        puts("\n");
 104
 105        /* Decompress the kernel with according algorithm */
 106        __decompress((char *)zimage_start, zimage_size, 0, 0,
 107                   (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, 0, error);
 108
 109        if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) &&
 110            fdt_magic((void *)&__appended_dtb) == FDT_MAGIC) {
 111                unsigned int image_size, dtb_size;
 112
 113                dtb_size = fdt_totalsize((void *)&__appended_dtb);
 114
 115                /* last four bytes is always image size in little endian */
 116                image_size = le32_to_cpup((void *)&__image_end - 4);
 117
 118                /* copy dtb to where the booted kernel will expect it */
 119                memcpy((void *)VMLINUX_LOAD_ADDRESS_ULL + image_size,
 120                       __appended_dtb, dtb_size);
 121        }
 122
 123        /* FIXME: should we flush cache here? */
 124        puts("Now, booting the kernel...\n");
 125}
 126