arch/sh/boot/compressed/misc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/boot/compressed/misc.c
   4  *
   5  * This is a collection of several routines from gzip-1.0.3
   6  * adapted for Linux.
   7  *
   8  * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
   9  *
  10  * Adapted for SH by Stuart Menefy, Aug 1999
  11  *
  12  * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
  13  */
  14
  15 #include <linux/uaccess.h>
  16 #include <asm/addrspace.h>
  17 #include <asm/page.h>
  18
  19 /*
  20  * gzip declarations
  21  */
  22
  23 #define STATIC static
  24
  25 #undef memset
  26 #undef memcpy
  27 #define memzero(s, n)     memset ((s), 0, (n))
  28
  29 /* cache.c */
  30 #define CACHE_ENABLE      0
  31 #define CACHE_DISABLE     1
  32 int cache_control(unsigned int command);
  33
  34 extern char input_data[];
  35 extern int input_len;
  36 static unsigned char *output;
  37
  38 static void error(char *m);
  39
  40 int puts(const char *);
  41
  42 extern int _text;               /* Defined in vmlinux.lds.S */
  43 extern int _end;
  44 static unsigned long free_mem_ptr;
  45 static unsigned long free_mem_end_ptr;
  46
  47 #ifdef CONFIG_HAVE_KERNEL_BZIP2
  48 #define HEAP_SIZE       0x400000
  49 #else
  50 #define HEAP_SIZE       0x10000
  51 #endif
  52
  53 #ifdef CONFIG_KERNEL_GZIP
  54 #include "../../../../lib/decompress_inflate.c"
  55 #endif
  56
  57 #ifdef CONFIG_KERNEL_BZIP2
  58 #include "../../../../lib/decompress_bunzip2.c"
  59 #endif
  60
  61 #ifdef CONFIG_KERNEL_LZMA
  62 #include "../../../../lib/decompress_unlzma.c"
  63 #endif
  64
  65 #ifdef CONFIG_KERNEL_XZ
  66 #include "../../../../lib/decompress_unxz.c"
  67 #endif
  68
  69 #ifdef CONFIG_KERNEL_LZO
  70 #include "../../../../lib/decompress_unlzo.c"
  71 #endif
  72
  73 int puts(const char *s)
  74 {
  75         /* This should be updated to use the sh-sci routines */
  76         return 0;
  77 }
  78
  79 void* memset(void* s, int c, size_t n)
  80 {
  81         int i;
  82         char *ss = (char*)s;
  83
  84         for (i=0;i<n;i++) ss[i] = c;
  85         return s;
  86 }
  87
  88 void* memcpy(void* __dest, __const void* __src,
  89                             size_t __n)
  90 {
  91         int i;
  92         char *d = (char *)__dest, *s = (char *)__src;
  93
  94         for (i=0;i<__n;i++) d[i] = s[i];
  95         return __dest;
  96 }
  97
  98 static void error(char *x)
  99 {
 100         puts("\n\n");
 101         puts(x);
 102         puts("\n\n -- System halted");
 103
 104         while(1);       /* Halt */
 105 }
 106
 107 const unsigned long __stack_chk_guard = 0x000a0dff;
 108
 109 void __stack_chk_fail(void)
 110 {
 111         error("stack-protector: Kernel stack is corrupted\n");
 112 }
 113
 114 /* Needed because vmlinux.lds.h references this */
 115 void ftrace_stub(void)
 116 {
 117 }
 118
 119 #define stackalign      4
 120
 121 #define STACK_SIZE (4096)
 122 long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
 123 long *stack_start = &user_stack[STACK_SIZE];
 124
 125 void decompress_kernel(void)
 126 {
 127         unsigned long output_addr;
 128
 129         output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
 130 #if defined(CONFIG_29BIT)
 131         output_addr |= P2SEG;
 132 #endif
 133
 134         output = (unsigned char *)output_addr;
 135         free_mem_ptr = (unsigned long)&_end;
 136         free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 137
 138         puts("Uncompressing Linux... ");
 139         cache_control(CACHE_ENABLE);
 140         __decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
 141         cache_control(CACHE_DISABLE);
 142         puts("Ok, booting the kernel.\n");
 143 }