misc.c

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/*
 * arch/m32r/boot/compressed/misc.c
 *
 * This is a collection of several routines from gzip-1.0.3
 * adapted for Linux.
 *
 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 *
 * Adapted for SH by Stuart Menefy, Aug 1999
 *
 * 2003-02-12:  Support M32R by Takeo Takahashi
 */

/*
 * gzip declarations
 */
#define STATIC static

#undef memset
#undef memcpy
#define memzero(s, n)     memset ((s), 0, (n))

static void error(char *m);

#include "m32r_sio.c"

static unsigned long free_mem_ptr;
static unsigned long free_mem_end_ptr;

#ifdef CONFIG_KERNEL_BZIP2
void *memset(void *s, int c, size_t n)
{
    char *ss = s;

    while (n--)
            *ss++ = c;
    return s;
}
#endif

#ifdef CONFIG_KERNEL_GZIP
void *memcpy(void *dest, const void *src, size_t n)
{
    char *d = dest;
    const char *s = src;
    while (n--)
        *d++ = *s++;

    return dest;
}

#define BOOT_HEAP_SIZE             0x10000
#include "../../../../lib/decompress_inflate.c"
#endif

#ifdef CONFIG_KERNEL_BZIP2
#define BOOT_HEAP_SIZE             0x400000
#include "../../../../lib/decompress_bunzip2.c"
#endif

#ifdef CONFIG_KERNEL_LZMA
#define BOOT_HEAP_SIZE             0x10000
#include "../../../../lib/decompress_unlzma.c"
#endif

static void error(char *x)
{
    puts("\n\n");
    puts(x);
    puts("\n\n -- System halted");

    while(1);   /* Halt */
}

void
decompress_kernel(int mmu_on, unsigned char *zimage_data,
          unsigned int zimage_len, unsigned long heap)
{
    unsigned char *input_data = zimage_data;
    int input_len = zimage_len;
    unsigned char *output_data;

    output_data = (unsigned char *)CONFIG_MEMORY_START + 0x2000
        + (mmu_on ? 0x80000000 : 0);
    free_mem_ptr = heap;
    free_mem_end_ptr = free_mem_ptr + BOOT_HEAP_SIZE;

    puts("\nDecompressing Linux... ");
    decompress(input_data, input_len, NULL, NULL, output_data, NULL, error);
    puts("done.\nBooting the kernel.\n");
}