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misc.c

/*
 * 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
 *
 * Modified for ARM Linux by Russell King
 *
 * Nicolas Pitre <nico@visuaide.com>  1999/04/14 :
 *  For this code to run directly from Flash, all constant variables must
 *  be marked with 'const' and all other variables initialized at run-time 
 *  only.  This way all non constant variables will end up in the bss segment,
 *  which should point to addresses in RAM and cleared to 0 on start.
 *  This allows for a much quicker boot time.
 */

unsigned int __machine_arch_type;

#include <linux/string.h>

#ifdef STANDALONE_DEBUG
#define putstr printf
#else

static void putstr(const char *ptr);

#include <linux/compiler.h>
#include <asm/arch/uncompress.h>

#ifdef CONFIG_DEBUG_ICEDCC

#ifdef CONFIG_CPU_V6

static void icedcc_putc(int ch)
{
      int status, i = 0x4000000;

      do {
            if (--i < 0)
                  return;

            asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
      } while (status & (1 << 29));

      asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
}

#else

static void icedcc_putc(int ch)
{
      int status, i = 0x4000000;

      do {
            if (--i < 0)
                  return;

            asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
      } while (status & 2);

      asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
}

#endif

#define putc(ch)  icedcc_putc(ch)
#define flush()   do { } while (0)
#endif

static void putstr(const char *ptr)
{
      char c;

      while ((c = *ptr++) != '\0') {
            if (c == '\n')
                  putc('\r');
            putc(c);
      }

      flush();
}

#endif

#define __ptr_t void *

/*
 * Optimised C version of memzero for the ARM.
 */
void __memzero (__ptr_t s, size_t n)
{
      union { void *vp; unsigned long *ulp; unsigned char *ucp; } u;
      int i;

      u.vp = s;

      for (i = n >> 5; i > 0; i--) {
            *u.ulp++ = 0;
            *u.ulp++ = 0;
            *u.ulp++ = 0;
            *u.ulp++ = 0;
            *u.ulp++ = 0;
            *u.ulp++ = 0;
            *u.ulp++ = 0;
            *u.ulp++ = 0;
      }

      if (n & 1 << 4) {
            *u.ulp++ = 0;
            *u.ulp++ = 0;
            *u.ulp++ = 0;
            *u.ulp++ = 0;
      }

      if (n & 1 << 3) {
            *u.ulp++ = 0;
            *u.ulp++ = 0;
      }

      if (n & 1 << 2)
            *u.ulp++ = 0;

      if (n & 1 << 1) {
            *u.ucp++ = 0;
            *u.ucp++ = 0;
      }

      if (n & 1)
            *u.ucp++ = 0;
}

static inline __ptr_t memcpy(__ptr_t __dest, __const __ptr_t __src,
                      size_t __n)
{
      int i = 0;
      unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;

      for (i = __n >> 3; i > 0; i--) {
            *d++ = *s++;
            *d++ = *s++;
            *d++ = *s++;
            *d++ = *s++;
            *d++ = *s++;
            *d++ = *s++;
            *d++ = *s++;
            *d++ = *s++;
      }

      if (__n & 1 << 2) {
            *d++ = *s++;
            *d++ = *s++;
            *d++ = *s++;
            *d++ = *s++;
      }

      if (__n & 1 << 1) {
            *d++ = *s++;
            *d++ = *s++;
      }

      if (__n & 1)
            *d++ = *s++;

      return __dest;
}

/*
 * gzip delarations
 */
#define OF(args)  args
#define STATIC static

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;       /* valid bytes in inbuf */
static unsigned inptr;        /* index of next byte to be processed in inbuf */
static unsigned outcnt;       /* 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);
static void gzip_mark(void **);
static void gzip_release(void **);

extern char input_data[];
extern char input_data_end[];

static uch *output_data;
static ulg output_ptr;
static ulg bytes_out;

static void *malloc(int size);
static void free(void *where);
static void error(char *m);
static void gzip_mark(void **);
static void gzip_release(void **);

static void putstr(const char *);

extern int end;
static ulg free_mem_ptr;
static ulg free_mem_ptr_end;

#define HEAP_SIZE 0x3000

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

#ifndef STANDALONE_DEBUG
static void *malloc(int size)
{
      void *p;

      if (size <0) error("Malloc error");
      if (free_mem_ptr <= 0) error("Memory error");

      free_mem_ptr = (free_mem_ptr + 3) & ~3;   /* Align */

      p = (void *)free_mem_ptr;
      free_mem_ptr += size;

      if (free_mem_ptr >= free_mem_ptr_end)
            error("Out of memory");
      return p;
}

static void free(void *where)
{ /* gzip_mark & gzip_release do the free */
}

static void gzip_mark(void **ptr)
{
      arch_decomp_wdog();
      *ptr = (void *) free_mem_ptr;
}

static void gzip_release(void **ptr)
{
      arch_decomp_wdog();
      free_mem_ptr = (long) *ptr;
}
#else
static void gzip_mark(void **ptr)
{
}

static void gzip_release(void **ptr)
{
}
#endif

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

      inbuf = input_data;
      insize = &input_data_end[0] - &input_data[0];

      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.)
 */
void flush_window(void)
{
      ulg c = crc;
      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;
      putstr(".");
}

#ifndef arch_error
#define arch_error(x)
#endif

static void error(char *x)
{
      arch_error(x);

      putstr("\n\n");
      putstr(x);
      putstr("\n\n -- System halted");

      while(1);   /* Halt */
}

#ifndef STANDALONE_DEBUG

ulg
decompress_kernel(ulg output_start, ulg free_mem_ptr_p, ulg free_mem_ptr_end_p,
              int arch_id)
{
      output_data       = (uch *)output_start;  /* Points to kernel start */
      free_mem_ptr            = free_mem_ptr_p;
      free_mem_ptr_end  = free_mem_ptr_end_p;
      __machine_arch_type     = arch_id;

      arch_decomp_setup();

      makecrc();
      putstr("Uncompressing Linux...");
      gunzip();
      putstr(" done, booting the kernel.\n");
      return output_ptr;
}
#else

char output_buffer[1500*1024];

int main()
{
      output_data = output_buffer;

      makecrc();
      putstr("Uncompressing Linux...");
      gunzip();
      putstr("done.\n");
      return 0;
}
#endif
      

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