LXR linux/arch/sh/boot/compressed/misc.c

   1/*
   2 * arch/sh/boot/compressed/misc.c
   3 *
   4 * This is a collection of several routines from gzip-1.0.3
   5 * adapted for Linux.
   6 *
   7 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
   8 *
   9 * Adapted for SH by Stuart Menefy, Aug 1999
  10 *
  11 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
  12 */
  13
  14#include <asm/uaccess.h>
  15#include <asm/addrspace.h>
  16#include <asm/page.h>
  17
  18/*
  19 * gzip declarations
  20 */
  21
  22#define STATIC static
  23
  24#undef memset
  25#undef memcpy
  26#define memzero(s, n)     memset ((s), 0, (n))
  27
  28/* cache.c */
  29#define CACHE_ENABLE      0
  30#define CACHE_DISABLE     1
  31int cache_control(unsigned int command);
  32
  33extern char input_data[];
  34extern int input_len;
  35static unsigned char *output;
  36
  37static void error(char *m);
  38
  39int puts(const char *);
  40
  41extern int _text;               /* Defined in vmlinux.lds.S */
  42extern int _end;
  43static unsigned long free_mem_ptr;
  44static unsigned long free_mem_end_ptr;
  45
  46#ifdef CONFIG_HAVE_KERNEL_BZIP2
  47#define HEAP_SIZE       0x400000
  48#else
  49#define HEAP_SIZE       0x10000
  50#endif
  51
  52#ifdef CONFIG_KERNEL_GZIP
  53#include "../../../../lib/decompress_inflate.c"
  54#endif
  55
  56#ifdef CONFIG_KERNEL_BZIP2
  57#include "../../../../lib/decompress_bunzip2.c"
  58#endif
  59
  60#ifdef CONFIG_KERNEL_LZMA
  61#include "../../../../lib/decompress_unlzma.c"
  62#endif
  63
  64#ifdef CONFIG_KERNEL_XZ
  65#include "../../../../lib/decompress_unxz.c"
  66#endif
  67
  68#ifdef CONFIG_KERNEL_LZO
  69#include "../../../../lib/decompress_unlzo.c"
  70#endif
  71
  72int puts(const char *s)
  73{
  74        /* This should be updated to use the sh-sci routines */
  75        return 0;
  76}
  77
  78void* memset(void* s, int c, size_t n)
  79{
  80        int i;
  81        char *ss = (char*)s;
  82
  83        for (i=0;i<n;i++) ss[i] = c;
  84        return s;
  85}
  86
  87void* memcpy(void* __dest, __const void* __src,
  88                            size_t __n)
  89{
  90        int i;
  91        char *d = (char *)__dest, *s = (char *)__src;
  92
  93        for (i=0;i<__n;i++) d[i] = s[i];
  94        return __dest;
  95}
  96
  97static void error(char *x)
  98{
  99        puts("\n\n");
 100        puts(x);
 101        puts("\n\n -- System halted");
 102
 103        while(1);       /* Halt */
 104}
 105
 106#ifdef CONFIG_SUPERH64
 107#define stackalign      8
 108#else
 109#define stackalign      4
 110#endif
 111
 112#define STACK_SIZE (4096)
 113long __attribute__ ((aligned(stackalign))) user_stack[STACK_SIZE];
 114long *stack_start = &user_stack[STACK_SIZE];
 115
 116void decompress_kernel(void)
 117{
 118        unsigned long output_addr;
 119
 120#ifdef CONFIG_SUPERH64
 121        output_addr = (CONFIG_MEMORY_START + 0x2000);
 122#else
 123        output_addr = __pa((unsigned long)&_text+PAGE_SIZE);
 124#if defined(CONFIG_29BIT)
 125        output_addr |= P2SEG;
 126#endif
 127#endif
 128
 129        output = (unsigned char *)output_addr;
 130        free_mem_ptr = (unsigned long)&_end;
 131        free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
 132
 133        puts("Uncompressing Linux... ");
 134        cache_control(CACHE_ENABLE);
 135        __decompress(input_data, input_len, NULL, NULL, output, 0, NULL, error);
 136        cache_control(CACHE_DISABLE);
 137        puts("Ok, booting the kernel.\n");
 138}
 139