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2 pj 1 
/* Project:     OSLib
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 * Description: The OS Construction Kit
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 * Date:                1.6.2000
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 * Idea by:             Luca Abeni & Gerardo Lamastra
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 *
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 * OSLib is an SO project aimed at developing a common, easy-to-use
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 * low-level infrastructure for developing OS kernels and Embedded
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 * Applications; it partially derives from the HARTIK project but it
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 * currently is independently developed.
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 *
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 * OSLib is distributed under GPL License, and some of its code has
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 * been derived from the Linux kernel source; also some important
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 * ideas come from studying the DJGPP go32 extender.
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 *
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 * We acknowledge the Linux Community, Free Software Foundation,
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 * D.J. Delorie and all the other developers who believe in the
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 * freedom of software and ideas.
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 *
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 * For legalese, check out the included GPL license.
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 */
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/* File: X1.C       */
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/* Startup code:        */
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/* Build parameters list & make info accessible */
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1621 fabio 26 
#include <arch/stdlib.h>
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#include <ll/i386/hw-func.h>
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#include <ll/i386/cons.h>
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#include <ll/i386/mb-info.h>
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#include <ll/i386/mem.h>
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FILE(X1);
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/* #define __DUMP_MEM__  */
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/* We need to copy from X address space to the application space  */
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/* the info structure to allow pointer access using flat model    */
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/* Remember that flat model is similar to small model also if we  */
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/* can see the whole memory, because it has no explicit far       */
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/* pointers; then if we pass into _args[] the address of the      */
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/* string of the n-th argument it could not be correctly accessed */
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/* because it lies in a memory zone unseen from PM application.   */
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/* This is due to the ELF format which has no relocation info     */
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/* since the file is already relocated starting from address 0!   */
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/* Then the PM application cannot see a real flat memory (segment */
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/* with 0 base) but CS,DS & SS MUST have the base correctly set.  */
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/* Refer to this figure:                      */
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/*                                */
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/* DOS Memory <- X is there                   */
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/*                                        */
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/* EXTENDED Memory -----[                     */
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/*          [                     */
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/*  Address  xxxx   [ <- Application code is here!        */
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/*          [                     */
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/*  Address  yyyy   [ <- Application Data & Stack!        */
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/*                                */
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/* Then CS has xxxx base while DS & SS have yyyy base!        */
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/* Stack base address; use this to check stack overflow!    */
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/* With Flat model I do not think we can use 386 protection     */
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/* to detect a stack overflow; anyway Watcom C use a standard   */
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/* function __CHK to detect it! The compiler place it whenever  */
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/* it calls a function to detect overflow           */
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DWORD _stkbase;
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DWORD _stktop;
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/* This is some extra stuff we need to compile with argument    */
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/* passing and math extensions                  */
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DWORD _argc = 0;
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typedef char *charp;
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charp _argv[100];
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1688 fabio 75 
extern void __kernel_init__(int argc, char *argv[]);
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extern void bios_save(void);
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extern void bios_restore(void);
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/* This is used in GNU-C to implement C++ constructors/destructors */
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/* See the lib sources for more details                */
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void __main(int argc, char **argv)
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{
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}
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struct multiboot_info * mbi_address(void)
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{
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  /* This is declared in [wc32/gnu]\x0.[asm/s] */
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  extern struct multiboot_info *mbi;
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  return (mbi);
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}
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void _startup(void)
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{
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  register int i = 0;
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  char temp[1000];
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  struct multiboot_info *mbi = mbi_address();
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  char *cmdline = (char *)(mbi->cmdline);
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40 pj 101 
  if (!(mbi->flags & MB_INFO_MEMORY)) {
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    cputs("X/Runtime library error!!! Unable to find memory information!\n");
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    l1_exit(-1);
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  }
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  if (mbi->flags & MB_INFO_CMDLINE) {
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    /* Build parameter list, up to 100 parms... */
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    while (cmdline[i] != 0 && i < 1000) {
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      temp[i] = cmdline[i];
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      _argv[_argc] = &(temp[i]);
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      while (cmdline[i] != ' ' && cmdline[i] != 0 && i < 1000) {
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        temp[i] = cmdline[i];
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        i++;
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      }
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      if (cmdline[i] == ' ') {
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        temp[i] = 0; i++; _argc++;
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      }
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    }
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    temp[i] = 0;
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    _argc++;
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  }
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  bios_save();
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  /* Call main procedure using standard C convention   */
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  /* Remember you cannot call any console I/O function */
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  /* if you do not call bios_save()            */
94 giacomo 127 
 
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2 pj 129 
#ifdef __DUMP_MEM__
40 pj 130 
  message("X/MEM   : %u\n",mbi->mem_upper);
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  message("DOS/MEM : %u\n",mbi->mem_lower);
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  message("x_bios Size : %u\n",sizeof(X_BIOSCALL));
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  message("mbi Size : %u\n",sizeof(struct multiboot_info));
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  message("Cmdline : %s\n",mbi->cmdline);
94 giacomo 135 
  message("Argc : %u\n",_argc);
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  message("Argv[0] : %s\n",_argv[0]);
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  message("Argv[1] : %s\n",_argv[1]);
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  message("Argv[2] : %s\n",_argv[2]);
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  message("Argv[3] : %s\n",_argv[3]);
2 pj 140 
#endif
1688 fabio 141 
  __kernel_init__(_argc,_argv);
40 pj 142 
  bios_restore();
2 pj 143 
}