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bzimage.c

/*
 * Load and execute a bzImage file from the device the 'open_file' and
 * friends use.
 */

#define __MINI_MALLOC__
#include "monitor.h"

#define MAXRDPART 32

int auto_flag = 1;

/* Names of init_ramdisk files to load */
static char *initrd_names[MAXRDPART];
static int  initrd_count = 0;
static long initrd_start = 0;
static long initrd_length = 0;
static int vga_mode = -1;     /* SVGA_MODE = normal */

static int  is_zimage = 0;
static char * image_name = 0;
static int  image_length;     /* Length of image in sectors */
static long image_size;       /* Length of image file in bytes */

static char * read_cmdfile();
static char * input_cmd();

/* ZIMAGE_LOAD_SEG: Segment that zImage data is loaded 
 * 0x10000  For largest possible zImage
 * 0x1000   Normal load address, smallest monitor.sys
 * 0x100    Largest zImage without using extended memory
 */
#define ZIMAGE_LOAD_SEG  0x10000
#define COMMAND_LINE_POS 0x4000 /* Offset in segment 0x9000 of command line */

static char * linux_command_line = 0;
int load_crc = 0;

static char buffer[1024];

cmd_bzimage(ptr)
register char * ptr;
{
   char * image;
   int ch;

   if( (auto_flag=(ptr==0)) ) ptr="";

   while(*ptr == ' ') ptr++;
   image = ptr;
   while(*ptr != ' ' && *ptr) ptr++;
   ch = *ptr;
   *ptr = '\0';
   if( ch ) ptr++;
   while(*ptr == '\n' || *ptr == ' ') ptr++;

   if( *ptr == '\0' ) ptr = 0;
   if( *image )
      bzimage(image, ptr);
   else
      bzimage("vmlinuz", ptr);
}

bzimage(fname, command_line)
char * fname;
char * command_line;
{
   long len;
   char * ptr;
   int low_sects;
   unsigned int address;
   
   initrd_count = 0;
   initrd_start = initrd_length = 0;
   vga_mode = -1;
   is_zimage = 0;
   image_name = strdup(fname);

   /* Ok, deal with the command line */
   if( build_linuxarg(fname, command_line) < 0 )
      return -1;

   if( open_file(image_name) < 0 )
   {
      if( auto_flag == 0 )
         printf("Cannot find file %s\n", image_name);
      return -1;
   }

   printf("Loading %s\n", image_name);

   if( read_block(buffer) < 0 || check_magics(image_name, buffer) < 0 )
   {
      printf("Cannot execute file %s\n", image_name);
      return -1;
   }

#ifndef __ELKS__
   if( boot_mem_top < 0x9500 )
   {
      printf("There must be 640k of boot memory to load Linux\n");
      return -1;
   }

   /* Guestimate how much the uncompressed kernel will use.
    * I expect we could lookup the size in the gzip header but
    * this is probably close enough (3*the size of the bzimage)
    */
   len = (image_size=file_length()) * 3 / 1024;
   if( main_mem_top < len )
   {
      printf("This kernel needs at least %d.%dM of main memory\n",
              (int)(len/1024), (int)(len*10/1024%10));
      return -1;
   }
   if( main_mem_top < 3072 )
      printf("RTFM warning: Linux needs at least 4MB of memory.\n");
#endif

   low_sects    = buffer[497] + 1; /* setup sects + boot sector */
   if (low_sects == 1) low_sects = 5;
   image_length = (file_length()+511)/512 - low_sects;
   address = 0x900;

#ifndef __ELKS__
#if ZIMAGE_LOAD_SEG == 0x10000
#if 0 /* Don't warn about this limit, the format is old. */
   if( is_zimage )
   {
      if( image_length > 0x7FF0/32 )
      {
         printf("This zImage file is too large, maximum is %dk bytes\n",
                 (0x7FF0/32 + low_sects)/2 );
         return -1;
      }
   }
#endif
#else
   if( is_zimage )
   {
      if( image_length > (__get_cs()>>5) - ZIMAGE_LOAD_SEG/32 )
      {
         printf("This zImage file is too large, maximum is %dk bytes\n",
                 ((__get_cs()>>5) - ZIMAGE_LOAD_SEG/32 + low_sects)/2 );
         return -1;
      }
   }
#endif
#endif

   /* load the blocks */
   rewind_file();
#ifdef CALC_CRC
   reset_crc();
#endif
   for(len = file_length(); len>0; len-=1024)
   {
      int v;

      printf("%dk to go \r", (int)(len/1024)); fflush(stdout);

#ifndef NOCOMMAND
      v = (kbhit()&0x7F);
      if( v == 3 || v == 27 )
      {
       printf("User interrupt!\n");
         getch();
       return -1;
      }
#endif

      if( read_block(buffer) < 0 )
      {
         printf("Error loading %s\n", image_name);
       return -1;
      }

#ifdef CALC_CRC
      if( len > 1024 ) addcrc(buffer, 1024); else addcrc(buffer, (int)len);
#endif
      for(v=0; v<1024; v+=512)
      {
       int rv;
       if( (rv=mem_write(buffer+v, 0L, address/2, 1)) != 0 ) {
          printf("Error 0x%02x while copying to extended memory\n", rv);
          return -1;
       }

       address += 2;

         if( low_sects )
       {
          low_sects--;
          if( low_sects == 0 )
          {
#if ZIMAGE_LOAD_SEG != 0x10000
             if( is_zimage ) address = ZIMAGE_LOAD_SEG/16;
             else            
#endif
                             address = 0x1000;
          }
       }
      }
   }
   close_file();

#ifdef CALC_CRC
   load_crc = display_crc("Loaded crc =");
#endif

#ifdef CALC_CRC
   if( check_crc() < 0 && !keep_going() ) return -1;
#endif

   printf("          \r"); fflush(stdout);

   if( initrd_count )
      if( load_initrd(address) < 0 )
         return -1;

#ifdef CALC_CRC
   if( check_crc() < 0 && !keep_going() ) return -1;
#endif

#ifndef NOMONITOR
   if( x86 < 3 || x86_emu )
   {
      if( x86 < 3 )
       printf("RTFM error: Linux-i386 needs a CPU >= 80386\n");
      else if( x86_emu )
       printf("RTFM error: Linux-i386 cannot be run in an emulator.\n");
      if( !keep_going() ) return -1;
   }
#endif

   printf("linux ");
   if( linux_command_line )
      printf("%s", linux_command_line);
   printf("\n");
   fflush(stdout);

   __set_es(0x9000);

   /* Save pointer to command line */
   if( linux_command_line )
   {
      __doke_es(0x0020, 0xA33F);
      __doke_es(0x0022, COMMAND_LINE_POS);      
      __movedata(__get_ds(), (unsigned)linux_command_line+1, 0x9000, COMMAND_LINE_POS, strlen(linux_command_line));
      free(linux_command_line);
   }

   __set_es(0x9000);

#if ZIMAGE_LOAD_SEG != 0x10000
#if ZIMAGE_LOAD_SEG != 0x1000
   if( is_zimage )
   {
#if ZIMAGE_LOAD_SEG != 0x100
      /* Tell setup that we've loaded the kernel somewhere */
      __doke_es(0x20C, ZIMAGE_LOAD_SEG);
#else
      /* Tell setup it's a bzImage _even_ tho it's a _zImage_ because we have
       * actually loaded it where it's supposed to end up!
       */
      __poke_es(0x211, __peek_es(0x211)|1);

      __poke_es(0x210, 0xFF); /* Patch setup to deactivate safety switch */
#endif
   }
#endif
#endif

   /* Tell the kernel where ramdisk is */
   if( initrd_count )
   {
      __set_es(0x9000);

      __doke_es(0x218, (unsigned) initrd_start);
      __doke_es(0x21A, (unsigned)(initrd_start>>16));

      __doke_es(0x21C, (unsigned) initrd_length);
      __doke_es(0x21E, (unsigned)(initrd_length>>16));
   }


   if( !is_zimage || initrd_count )
      __poke_es(0x210, 0xFF); /* Patch setup to deactivate safety switch */

   /* Set SVGA_MODE if not 'normal' */
   if( vga_mode != -1 ) __doke_es(506, vga_mode);

   /* Default boot drive is auto-detected floppy */
   if( __peek_es(508) == 0 ) __poke_es(508, 0x200);

   printf("Starting ...\n");;

#if ZIMAGE_LOAD_SEG == 0x10000
   if( is_zimage )
      /* Copy 512k from high memory then start */
      start_zimage();
   else
#endif

   /* Finally do the deed */
   {
#asm
  ! Kill the floppy motor, needed in case the kernel has no floppy driver.
  mov dx,#0x3f2
  xor al, al
  outb

  ! Setup required registers and go ...
  mov ax,#$9000
  mov bx,#$4000-12      ! Fix this to use boot_mem_top
  mov es,ax
  mov fs,ax
  mov gs,ax
  mov ds,ax
  mov ss,ax
  mov sp,bx
  jmpi      0,$9020           ! Note SETUPSEG NOT INITSEG
#endasm
   }
}

check_magics(fname, image_buf)
register char * fname;
register char * image_buf;
{
   is_zimage = 0;

   /* Boot sector magic numbers */
   if( *(unsigned short*)(image_buf+510) != 0xAA55 ||
      memcmp(image_buf, "\270\300\007\216") != 0 )
   {
      printf("File %s is not a linux Image file\n", fname);
      return -1;
   }

   /* Setup start */
   if ( memcmp(image_buf+0x202, "HdrS", 4) == 0 &&
   /* Setup version */
       *(unsigned short*)(image_buf+0x206) >= 0x200 )
   {
      /* Code 32 start address for zImage */
      if( *(unsigned long*)(image_buf+0x214) == 0x1000 )
      {
       printf("File %s is a zImage file\n", fname);
       is_zimage = 1;
       return 0;
      }
      else
      /* Code 32 start address bzImage */
      if( *(unsigned long*)(image_buf+0x214) == 0x100000 )
      {
       printf("File %s is a bzImage file\n", fname);
       return 0;
      }
   }

   is_zimage = 1;
   printf("File %s is an old Image file\n", fname);
#if ZIMAGE_LOAD_SEG == 0x10000 || ZIMAGE_LOAD_SEG == 0x1000
   return 0;
#else
   return -1;
#endif
}

static char *
read_cmdfile(iname)
char * iname;
{
   char * ptr = strchr(iname, '.');
   char buf[16];
   long len;

   buf[8] = '\0';
   strncpy(buf, iname, 8);
   strcat(buf, ".cfg");

   if( ptr == 0 && open_file(buf) >= 0 )
   {
      /* Ah, a command line ... */
      printf("Loading %s\n", buf);
      len = file_length();
      if( len > 1023 )
      {
       printf("Command line file %s truncated to 1023 characters\n", buf);
       len = 1023;
      }
      if( read_block(buffer) >= 0 )
      {
         register int i;
       for(i=0; i<len; i++)
          if( buffer[i] < ' ' ) buffer[i] = ' ';
       buffer[len] = '\0';

         close_file();  /* Free up loads a room */
         return strdup(buffer);
      }
   }
   close_file();  /* Free up loads a room */
   return 0;
}

char *
input_cmd(iname)
char * iname;
{
   char lbuf[20];
   register int cc;

   for(;;)
   {
      printf("%s: ", iname); fflush(stdout);

      cc = read(0, buffer, sizeof(buffer)-1);
      if( cc <= 0 ) return 0;
      buffer[cc] = 0;
      if( cc == 1 && *buffer != '\n' )
      {
       putchar('\n');
       cc = (buffer[0] & 0xFF);

         if( cc == 0xAD ) /* ALT-X */
          return 0;

#ifdef NOCOMMAND
         cmd_type("helpprmt.txt");
#else
       help_key(cc);
#endif
       continue;
      }
      if( buffer[cc-1] == '\n' ) buffer[cc-1] = '\0';

      break;
   }

   return strdup(buffer);
}

build_linuxarg(image, inp)
char *image, *inp;
{
static char * auto_str  = "auto";
static char * image_str = "BOOT_IMAGE=";
   int len = 0;
   char * ptr, *s, *d;
   char * free_cmd = 0, * cmd = 0;
   char * free_inp = 0;

   if( linux_command_line ) free(linux_command_line);
   linux_command_line = 0;

   if( cmd == 0 )
      cmd = free_cmd = read_cmdfile(image);

   if( cmd == 0 && auto_flag ) return 0;

   if( auto_flag )
   {
      ptr = strdup(cmd);
      for(s=strtok(ptr, " "); s; s=strtok((char*)0, " "))
      {
         if( strncasecmp(s, "prompt",6) == 0 && free_inp == 0)
            inp = free_inp = input_cmd(image);
      }
      free(ptr);
   }
   else if( inp == 0 )
   {
      inp = free_inp = input_cmd(image);
      if( inp == 0 ) 
      {
       printf("\nAborted\n");
       return -1;
      }
   }

   if( auto_flag ) len += strlen(auto_str) + 1;
   if( image ) len += strlen(image_str) + strlen(image) + 1;
   if( cmd ) len += strlen(cmd) + 1;
   if( inp ) len += strlen(inp) + 1;

   if( len == 0 ) return 0;

   ptr = malloc(len+1);
   if( ptr == 0 )
   {
      printf("Unable to create linux command line\n");
      if( free_cmd ) free(free_cmd);
      if( free_inp ) free(free_inp);
      return -1;
   }

   *ptr = 0; ptr[1] = 0;
   if( auto_flag ) { strcat(ptr, " "); strcat(ptr, auto_str); }
   if( cmd ) { strcat(ptr, " "); strcat(ptr, cmd); }
   if( inp ) { strcat(ptr, " "); strcat(ptr, inp); }

   if( free_cmd ) free(free_cmd);
   if( free_inp ) free(free_inp);

   if( (d = malloc(len+1)) == 0 )
   {
      printf("Unable to compact linux command line\n");
      free(ptr);
      return -1;
   }
   *d = '\0';
   for(s=strtok(ptr, " "); s; s=strtok((char*)0, " "))
   {
      if( strncasecmp(s, "vga=",4) == 0 )
      {
         if( strncasecmp(s+4, "ask", 3) == 0 )
          vga_mode = -3;
       else
         if( strncasecmp(s+4, "ext", 3) == 0 )
          vga_mode = -2;
       else
         if( strncasecmp(s+4, "nor", 3) == 0 )
          vga_mode = -1;
       else
         if( strncasecmp(s+4, "cur", 3) == 0 )
          vga_mode = 0x0f04;
       else
       {
          s+=4; getnum(&s, &vga_mode);
       }
      }
      else if( strncasecmp(s, "ramdisk_file=", 13) == 0 )
      {
       if (initrd_count >= MAXRDPART) {
          printf("Too many ramdisk files\n");
          return -1;
       }
       initrd_names[initrd_count++] = strdup(s+13);
      }
      else if( strncasecmp(s, image_str, 11) == 0 )
      {
       if( image_name ) free(image_name);
       if( s[11] )
            image_name = strdup(s+11);
       else
          image_name = strdup(image);
      }
      else if( strncasecmp(s, "prompt",6) == 0 )
         ;
      else
      {
         strcat(d, " ");
       strcat(d, s);
      }
   }
   free(ptr); ptr = d;

   strcat(ptr, " "); strcat(ptr, image_str); strcat(ptr, image_name);
   len = strlen(ptr);

   if( len > 2048 )
   {
      printf("Linux command line truncated to 2047 characters\n");
      ptr[2048] = 0;
      len = 2048;
   }

#ifdef __ELKS__
   fprintf(stderr, "Command line: '%s'\n", ptr+1);
#endif

   linux_command_line = ptr;

   return 0;
}

keep_going()
{
static int burning = 0;
   char buf[4];
   int cc;

   printf("Keep going ? "); fflush(stdout);

#ifdef __STANDALONE__
   cc = read(0, buf, 1);
#else
   cc = read(0, buf, 4);
#endif
   if( cc >= 1 && (*buf == 'Y' || *buf == 'y') )
   {
      printf("Yes, Ok%s\n", burning?"":", burn baby burn!");
      return burning=1;
   }
   printf("No\n");
   return 0;
}

load_initrd(k_top)
unsigned int k_top;
{
   char * fname;
   long baseaddress;
   long file_len;
   unsigned sectcount, sectno;
   int fno;

   initrd_length = 0;
   baseaddress = (long)k_top * 256;

   for(fno = 0; fno <initrd_count; fno++)
   {
      fname = initrd_names[fno];
      if( *fname == '+' ) fname++;
      while( open_file(fname) < 0 )
      {
       char buf[2];
       close_file();
       printf("Please insert disk containing '%s' and press return:", fname);
       fflush(stdout);
       if( read(0, buf, 2) <=0 ) return -1;
      }

      file_len = file_length();
      sectcount = (file_len+511)/512;

      printf("Loading %s\n", fname);

      for(sectno=0; sectno<sectcount; sectno+=2) {
#ifndef NOCOMMAND
       int v = (kbhit()&0x7F);
       if( v == 3 || v == 27 ) {
          printf("User interrupt!\n");
          getch();
          return -1;
       }
#endif
       printf("%dk to go \r", (sectcount-sectno)/2); fflush(stdout);
       if( read_block(buffer) < 0 ) {
          printf("Read error loading ramdisk\n");
          return -1;
       }
       if( mem_write(buffer, baseaddress, sectno, 2) != 0 ) return -1;
      }
      close_file();

      baseaddress += file_len;
      initrd_length += file_len;
   }

   /* Move ramdisk to top of accessable memory. */
   baseaddress = (long)k_top * 256;

   if( main_mem_top >= 15360 ) initrd_start = 0x1000000L;
   else                        initrd_start = 0x100000 + main_mem_top*1024;

   sectcount = (initrd_length+511)/512;
   initrd_start -= (long)sectcount *512;
   initrd_start &= -4096;

   printf("Moving ramdisk to 0x%06lx..0x%06lx, (%ld)\n", 
        initrd_start, initrd_start + initrd_length, initrd_length);

   while(sectcount>0) {
      sectcount--;
      if ( mem_read(buffer, baseaddress, sectcount) != 0 ||
          mem_write(buffer, initrd_start, sectcount, 1) != 0)
      {
         printf("Error moving ramdisk\n");
       return -1;
      }
   }

   return 0;
}

#ifdef CALC_CRC
check_crc()
{
   int low_sects;
   unsigned int address = 0x900;
   long len;
   int re_crc;

   reset_crc();

   __movedata(address*16, 0, __get_ds(), buffer, 512);
   low_sects = buffer[497] + 1; /* setup sects + boot sector */
   if (low_sects == 1) low_sects = 5;

   for(len=image_size; len>0; len-=512)
   {
      if (mem_read(buffer, 0L, address/2) != 0)
      {
       printf("Unable to read back for CRC check\n");
       return;
      }

      if( len > 512 ) addcrc(buffer, 512); else addcrc(buffer, (int)len);
      
      address += 2;
      if( low_sects )
      {
       low_sects--;
       if( low_sects == 0 )
       {
#if ZIMAGE_LOAD_SEG != 0x10000
          if( is_zimage ) address = ZIMAGE_LOAD_SEG/16;
          else            
#endif
                          address = 0x1000;
       }
      }
   }
   re_crc = display_crc("Images CRC check value =");

   if( re_crc != load_crc )
   {
      printf("Error: CRC doesn't match value written to memory!\n");
      return -1;
   }
   return 0;
}
#endif

#if ZIMAGE_LOAD_SEG == 0x10000
start_zimage()
{
#include "zimage.v"
   __movedata(__get_ds(), zimage_data, 0, zimage_start, zimage_size);
   {
#asm
  callf     zimage_start,0
#endasm
   }
}
#endif

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