misc.c

Go to the documentation of this file.

/*
 * arch/h8300/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 h8300 by Yoshinori Sato 2006
 */

#include <asm/uaccess.h>

/*
 * gzip declarations
 */

#define OF(args)  args
#define STATIC static

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

typedef unsigned char  uch;
typedef unsigned short ush;
typedef unsigned long  ulg;

#define WSIZE 0x8000        /* Window size must be at least 32k, */
                /* and a power of two */

static uch *inbuf;       /* input buffer */
static uch window[WSIZE];    /* Sliding window buffer */

static unsigned insize = 0;  /* valid bytes in inbuf */
static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
static unsigned outcnt = 0;  /* bytes in output buffer */

/* gzip flag byte */
#define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
#define COMMENT      0x10 /* bit 4 set: file comment present */
#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
#define RESERVED     0xC0 /* bit 6,7:   reserved */

#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())

/* Diagnostic functions */
#ifdef DEBUG
#  define Assert(cond,msg) {if(!(cond)) error(msg);}
#  define Trace(x) fprintf x
#  define Tracev(x) {if (verbose) fprintf x ;}
#  define Tracevv(x) {if (verbose>1) fprintf x ;}
#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
#else
#  define Assert(cond,msg)
#  define Trace(x)
#  define Tracev(x)
#  define Tracevv(x)
#  define Tracec(c,x)
#  define Tracecv(c,x)
#endif

static int  fill_inbuf(void);
static void flush_window(void);
static void error(char *m);

extern char input_data[];
extern int input_len;

static long bytes_out = 0;
static uch *output_data;
static unsigned long output_ptr = 0;

static void error(char *m);

int puts(const char *);

extern int _text;       /* Defined in vmlinux.lds.S */
extern int _end;
static unsigned long free_mem_ptr;
static unsigned long free_mem_end_ptr;

#define HEAP_SIZE             0x10000

#include "../../../../lib/inflate.c"

#define SCR *((volatile unsigned char *)0xffff8a)
#define TDR *((volatile unsigned char *)0xffff8b)
#define SSR *((volatile unsigned char *)0xffff8c)

int puts(const char *s)
{
    return 0;
}

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

    for (i=0;i<n;i++) ss[i] = c;
    return s;
}

void* memcpy(void* __dest, __const void* __src,
                size_t __n)
{
    int i;
    char *d = (char *)__dest, *s = (char *)__src;

    for (i=0;i<__n;i++) d[i] = s[i];
    return __dest;
}

/* ===========================================================================
 * Fill the input buffer. This is called only when the buffer is empty
 * and at least one byte is really needed.
 */
static int fill_inbuf(void)
{
    if (insize != 0) {
        error("ran out of input data");
    }

    inbuf = input_data;
    insize = input_len;
    inptr = 1;
    return inbuf[0];
}

/* ===========================================================================
 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 * (Used for the decompressed data only.)
 */
static void flush_window(void)
{
    ulg c = crc;         /* temporary variable */
    unsigned n;
    uch *in, *out, ch;

    in = window;
    out = &output_data[output_ptr];
    for (n = 0; n < outcnt; n++) {
        ch = *out++ = *in++;
        c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
    }
    crc = c;
    bytes_out += (ulg)outcnt;
    output_ptr += (ulg)outcnt;
    outcnt = 0;
}

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

    while(1);   /* Halt */
}

#define STACK_SIZE (4096)
long user_stack [STACK_SIZE];
long* stack_start = &user_stack[STACK_SIZE];

void decompress_kernel(void)
{
    output_data = 0;
    output_ptr = (unsigned long)0x400000;
    free_mem_ptr = (unsigned long)&_end;
    free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;

    makecrc();
    puts("Uncompressing Linux... ");
    gunzip();
    puts("Ok, booting the kernel.\n");
}